KR20060059632A - Various type of ice making device and controll system thereof - Google Patents

Abstract

The present invention provides various types of ice manufacturing apparatuses and control methods for automatically stopping the production of an appropriate amount while producing snow-type powder ice or flake-shaped ice according to whether the ice-type ice is formed in the ice making drum. Regarding,

A water supply tank in which supply water is filled by a solenoid valve installed in the water supply pipe, a hollow ice-making drum disposed to be locked to the water supply tank to a predetermined depth and rotated by a driving motor, and the ice-making drum penetrates from one side to evaporate refrigerant. A coolant circulation path pipe part provided to be generated, a seal spindle part provided while forming a sealing seal in the refrigerant ice making drum, and a cutting knife spaced apart by a predetermined gap on the ice making drum surface, and the coolant circulation path. A detection unit comprising a refrigeration unit installed to supply and discharge refrigerant gas to a pipe portion, a supply level sensor for detecting a water level in the water supply tank, the ice-making drum drive motor, and a power switch for supplying power to the refrigerating device Wow, ice type switch to select snow mode and flake mode, and rotation speed of ice making drum A switch unit consisting of a speed switch for controlling and an installed microcomputer for controlling the driving of the ice making drum, the water supply, the water supply, and the refrigerating device by predetermined information by electrical signals of the switch unit and the sensing unit. In the ice powder manufacturing apparatus comprising:

The detection unit provides an ice powder manufacturing apparatus further comprising a production sensor that detects the production amount of the snow and flakes cut by the cutting knife and applies an electrical signal to the microcomputer, thereby providing a plurality of ice powder manufacturing apparatuses. Ice powder production apparatus which can improve productivity by injecting refrigerant at a uniform injection pressure by means of a refrigerant injection means to homogenize ice quality, and automatically produce snow type powder ice or flake ice by microcomputer control. There is an excellent effect to provide.

Flake, ice powder, ice making drum, cutting knife

Description

Various types of ice making device and control method {various type of ice making device and controll system

1 is a perspective view showing an ice manufacturing apparatus of various forms according to the present invention.

Figure 2 is a view showing the configuration of the ice production apparatus of various forms according to the present invention.

Figure 3 is a side cross-sectional view of the ice making drum and the seal spindle of the ice production apparatus of various forms according to the present invention.

4 is a view showing a cutting knife installed in accordance with the present invention.

Figure 5 is a block diagram showing a control method of the ice production apparatus of various forms according to the present invention.

* Description of the symbols for the main parts of the drawings *

2: various types of ice making equipment 4: water supply tank

6: De-icing drum 8: Refrigerant circulation path pipe

10: seal head 12: cutting knife

13: drive motor 14: refrigeration unit

16: detection unit 18: switch unit

20: Mycom 22: water supply pipe

24: Solenoid valve 29: Capillary tube

30: Appearance 32: Refrigerant supply line

34: Interior 36: Refrigerant supply port

38: refrigerant discharge port 40: sealing room

42: rotation time 44: spindle

46: sealing cap 48: fixed date

50: Pressure spring 52: Supply water level sensor

54: output sensor 56: power switch

58: ice type switch 60: speed switch

64: front switch panel 66: snow lamp

68: Flake lamp 70: Supply water level clamp

72: output full lamp 74: ice-making door

The present invention relates to the production of various types of ice, and more particularly, depending on whether or not to select the ice type of the ice formed in the ice making drum, the snow-type powder ice or flake-like ice as well as the production of an appropriate amount The present invention relates to various types of ice manufacturing apparatuses and a control method thereof, in which a stop is automatically controlled by a yield sensor.

Installing a rotating ice-making drum in a conventional water supply tank to form a water film on the surface of the ice-making drum; Creating a refrigerant evaporation chamber inside the ice making drum; Inserting a circulation pipe for refrigerant circulation into one seal shaft portion of the ice-making drum; Vaporizing the compressed refrigerant in the rotating drum to freeze the water film on the ice-making drum surface; Apparatus for manufacturing an ice powder by contacting a cutting knife with ice on the surface of an ice making drum is disclosed in Korean Utility Model Registration No. 73397 and a device for manufacturing ice cubes in Korean Patent Registration Publication No. 178693.

However, the disclosed ice powder or ice cube manufacturing apparatus obtains a predetermined effect of increasing the cooling efficiency by forming a refrigerant vaporization chamber inside the rotating drum, but the seal spindle portion of one side of the ice making drum supporting the refrigerant circulation path tube It is composed of open end of both ends to assemble seals at both ends of the shaft, making it difficult to manufacture, assemble and repair the passage pipe and seal spindle, and connect the inner end of the passage pipe installed in the ice making drum to the support shaft on the other side of the ice making drum. Therefore, when the ice making drum rotates, the connection assembly of the passage pipe and the seal circumference interferes with the interference, so that the sealing force between the seal spindle and the passage pipe is weakened and the passage pipe easily ages.

Furthermore, in the case of manufacturing ice cubes according to the disclosed technology, the operation time of the ice making drum is configured by the operator to manually operate the switch, which is inconvenient to use; Since the capillary tubes for the refrigerant injection, such as length, are close to the tubes of the ice making drum, there is a problem in that the cooling temperature distribution is uneven in the vaporization chamber and the ice quality of the ice making drum surface is uneven.

As a result, the apparatus for producing flake ice or powder ice has not been put to practical use so far at home and abroad.

It is proposed in order to solve the problems of the known technology made as described above, the object of the present invention is to produce a snow-type powder ice or flake-like ice, depending on whether the ice type of the ice formed in the ice making drum An object of the present invention is to provide various types of ice manufacturing apparatuses and a control method thereof, by which a production amount sensor automatically controls a proper amount of production and stoppage.

The present invention for realizing this

A water supply tank in which supply water is filled by a solenoid valve installed in the water supply pipe, a hollow ice-making drum disposed to be locked to the water supply tank to a predetermined depth and rotated by a driving motor, and the ice-making drum penetrates from one side to evaporate refrigerant. A coolant circulation path pipe part provided to be generated, a seal spindle part installed while the refrigerant circulation path pipe part is sealed to the ice making drum, and a cutting knife spaced apart by a predetermined gap from the ice making drum surface, and the refrigerant circulation path pipe part. A detection unit comprising a refrigeration unit installed to supply and discharge refrigerant gas in the air, a supply level sensor for detecting a water level in the water supply tank, the ice-making drum drive motor, and a power switch for supplying power to the refrigerating device; Ice type switch to select snow, flake, and control the speed of ice making drum A switch unit comprising a speed switch, and an installed microcomputer for controlling the drive of the ice making drum, the water supply, the water supply, and the refrigerating device by preset information by an electrical signal of the switch unit and the sensing unit. In the ice manufacturing apparatus made,

The detection unit is to provide a variety of ice manufacturing apparatus formed by further installing a production sensor for sensing the output by the predetermined information of the snow and flakes cut by the cutting knife to apply an electrical signal to the microcomputer.

In order to check the operation of the switch unit is located in the front switch panel of the case to provide a variety of types of ice manufacturing apparatus made by installing a snow lamp, a flake lamp, a supply water level lamp, a production full lamp.

The refrigerant circulation path pipe is formed in a predetermined length and diameter while penetrating the ice making drum at one side, and the inner pipe is inserted to form a refrigerant supply pipe with a gap therein and a gap inside the exterior, and A refrigerant supply port formed to supply a refrigerant gas to one side of an exterior and a refrigerant discharge port formed to discharge a refrigerant gas vaporized on one side of the inner tube to provide various types of ice manufacturing apparatus.

The seal spindle portion is a rotary seal attached to the inner end of the cup-type spindle, a sealing cap attached to the inner end of the main shaft inlet and a rotation seal attached to the inner end, the fixed state slips in close contact with the rotation seal and is connected to the refrigerant circulation path tube The present invention provides a variety of ice manufacturing apparatus including a pressurized spring that closely attaches a fixed seal to a rotating seal.

Turning on the power to various types of ice making apparatus to turn on the supply water check lamp and determining the presence or absence of the supply water in the water supply tank using the supply water level sensor (S10);

After checking whether the water supply in the water supply tank is filled with the electric signal by variable opening and closing the solenoid valve of the water supply pipe (S20) and

Detecting an operation of an ice type switch for selecting a snow mode and a flake mode after determining the filling of the feed water in the water supply tank (S30);

In step S40 of controlling the snow mode at the same time as the snow lamp is turned on when the ice type switch is pressed once,

If the speed switch operation is not detected after the snow mode is selected, while rotating the drive motor with 3 RPM, which is the first step out of five steps, if the operation is detected, the rotation speed is increased by one step to control the rotation and operate the refrigerating device (S50). Wow,

Detecting the accumulated ice in the ice-making chamber of the snow amount cut by the cutting knife from the ice-making drum by the driving motor and the refrigerating device (S60);

And stopping the driving motor and the refrigerating device at the same time when the output full lamp is turned on when the output sensor detects the output sensor, and repeatedly controlling that the reduction of the load in the ice making chamber is restarted when the output sensor is detected (S70);

In step S80, when the ice type switch is pressed twice, the flake lamp is turned on and the ice making drum is stopped for 1 minute and then the flakes are controlled by the flake mode for repeatedly driving the drive motor by rotating for 3 seconds (S80).

When the production of the flakes, when the output pool is detected by the production sensor, the output of the full lamp is turned on at the same time stopping the drive motor and the freezing device, and if the decrease in the ice-making load is again detected by the production sensor to repeat the control step ( S90) to provide a control method of the ice manufacturing apparatus of various types, characterized in that the control.

When the operation of the speed switch is sensed, the controller will rotate the driving motor by increasing the speed by 3 steps in 1 step, 5 RPM in 2 steps, 6 RPM in 3 steps, 9 RPM in 4 steps, 9 RPM in 4 steps, and 12 RPM in 5 steps. It is to provide a control method of various types of ice manufacturing apparatus characterized in that.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in more detail.

Figure 1 is a perspective view showing a variety of forms of ice manufacturing apparatus according to the present invention, Figure 2 is a view showing the configuration of various forms of ice manufacturing apparatus according to the present invention, Figure 3 of the various forms according to the present invention Side cross-sectional view of an ice making drum and a seal spindle of an ice making machine.

4 is a view illustrating a cutting knife according to the present invention, and FIG. 5 is a flowchart illustrating a control method of various types of ice manufacturing apparatuses according to the present invention.

The various types of ice manufacturing apparatus 2 includes a known water supply tank 4, an ice making drum 6, a refrigerant circulation path tube part 8, a seal spindle part 10, a cutting knife 12, a driving motor 13 ), The refrigerating device 14, the sensing unit 16, the switch unit 18, and the microcomputer 20.

The water supply tank 4 is formed to a predetermined size and depth so that the supply water is filled by the solenoid valve 24 installed in the water supply pipe (22).

The supply water is supplied to the water supply tank 4 so that the ice making drum 6 can be locked by supplying the opening and closing of the solenoid valve 22.

The ice making drum (6) is a hollow drum disposed to be locked to a water supply (4) to a predetermined depth to be rotated by the drive motor (13), and the refrigerant circulation path pipe part (8) is connected to the seal spindle (10). It is installed by.

The ice making drum 6 can be manufactured in various sizes according to the design, and is not limited. The ice making drum 6 is made of stainless steel to enable hygiene management as well as to facilitate the A / S side.

The ice making drum 6 is connected to the drive motor 13 and the chain 26 to rotate by the output power, the drive motor 13 is rotated by the preset information by the microcomputer 20. It is controlled.

The refrigerant circulation path tube part 8 is installed to pass through the ice making drum 6 from one side so as to generate vaporization of the refrigerant. That is, the refrigerant circulation path pipe section 8 is easily installed to supply and discharge the refrigerant gas supplied to the ice making drum 6.

The refrigerant circulation path tube part 8 is formed in a predetermined length and diameter while penetrating the ice making drum 6 from one side, and through the discharge hole 28 at predetermined intervals, winding the capillary tube 29 assembled therein to cool the refrigerant. The inner tube 34 is inserted to form an outer casing 30 which causes gas to be injected, and a coolant supply channel 32 formed in a gap in the outer casing 30.

A refrigerant supply port 36 is formed to supply refrigerant gas to one side of the exterior 30, and a refrigerant discharge port 38 is formed to discharge vaporized refrigerant gas to one side of the inner tube 34. Is done.

The seal spindle unit 10 is installed while the seal circulating pipe section 8 forms a sealing room 40 in a hermetic manner to the ice making drum 6.

The seal spindle portion 10 is attached to the rotary seal 42 attached to the inner end of the cup-type spindle, the sealing cap 46 of the inlet of the main shaft 44 and the rotary seal 42 symmetrical to the inner end, A fixed seal 48 slid in close contact with the rotation seals 42 and symmetrically positioned to be supported by the refrigerant circulation path tube part 8, and a pressure spring for closely fixing the fixed seal 48 to the rotation seal 42. 50 is provided symmetrically.

The seal shaft portion 10 is the main shaft 44, the sealing cap 46 is screwed into the refrigerant circulation path pipe portion 8 is inserted through the sealing room 40 and then touched by two sets of pressure springs (50) The fixed seal 48, which is disposed on both sides by the pressure spring 50 and is pressed down, is supported by the rotary seal 42 on one side thereof.

Accordingly, the fixing seal 48 is disposed in the main shaft 44 so that the rotation is made in the airtight state, and the sealing cap 40 is hermetically formed by screwing the sealing cap 46 at one side to optimize the sealing force. I can manage it in a state.

The cutting knives 12 are spaced apart by a predetermined gap on the surface of the ice making drum 6, and can be installed by adjusting between the cutting knife 12 and the surface of the ice making drum 6 as necessary.

The refrigerating device 14 is installed to supply and discharge the refrigerant gas to the refrigerant circulation path tube unit 8 in a conventional technique.

The detection unit 16 is provided with a supply water level sensor 52 for detecting the water level in the water supply tank 4, and the production unit 54 is installed in the detection unit 16 by cutting knife ( The microcomputer 20 controls the production amount of the snow-type powdered ice or the flake-shaped ice cut by 12) by predetermined information.

The production sensor 54 detects the amount of snow-type powder ice or flake-shaped ice that is produced, and when a predetermined amount is reached, a detection signal is applied to the microcomputer 20, and the microcomputer 20 is driven. The operation of the motor 13 and the internal motion mechanism 14 is controlled to control the production of snow-type powder ice or flake ice.

The switch unit 18 includes an ice making drum drive motor 13, a power switch 56 for applying power to the refrigerating device 14, and an ice type switch for selecting snow type powder ice or flake ice ( 58) and a speed switch 60 for controlling the rotational speed of the ice making drum.

When the ice type switch 58 is pressed once, the micom 20 recognizes the snow mode and presses the flake mode twice.

And in order to check whether there is a malfunction by the operation of the switch unit 18 or whether there is a certain operation or not located on the front switch panel 64 of the case 62, snow lamp 66, flake lamp 68, supply water level tank The lamp 70 and the production amount full lamp 72 are provided.

The front surface of the case 62 is provided with an ice-making chamber door 74 made of a transparent material, so that the production amount of snow or flakes can be visually confirmed.

In addition, the microcomputer 20 is configured to drive the ice making drum 6 and the water supply, the water supply, and the refrigeration unit 14 by electric signals of the switch unit 18 and the sensing unit 16. It is installed to control by.

Referring to the operation of the present invention made as described above, the user turns on the power switch 56 to supply power to the ice manufacturing apparatus 2 of various forms (S10).

As the various types of ice manufacturing apparatus 2 is supplied with power, the microcomputer 20 first determines the level of the supply water through the supply water level sensor 52 in the water supply tank 4 (S10).

Thus, if there is no water supply in the water supply tank 4, the solenoid valve 24 of the water supply pipe 22 is opened and closed (S20) to open and close the supply water supply until the predetermined water level is reached in the water supply tank 4. do.

By the opening and closing of the solenoid valve 24, the supply water is supplied to the water supply tank 4 to reach a predetermined level, and the microcomputer 20 detected by the supply water level sensor 52 by the preset information is the solenoid valve ( 24) to turn off the water supply pipe 22 to block (S20) to cut off the supply of supply water.

As described above, the microcomputer 20 variably controls the solenoid valve 24 at the time of producing snow or flakes through the solenoid valve 24 so that a predetermined amount of supply water is always filled in the water supply tank 4.

Accordingly, while the water supply tank 4 is in the state of supply water, the microcomputer 20 operates the drive motor 13 to rotate the ice making drum 6 and is in a ready state, and the user checks the supply water level clamp 70. And the ice type switch 58 is pressed. (S30)

If the user presses the ice type switch 58 once after the rotation of the ice making drum 6, the microcomputer 20 recognizes that the snow is produced (S40) so that the driving motor 13 can be moved to the first stage by the preset information. Is rotated to 3 RPM.

Looking at the number of revolutions according to the above five stages, the first stage is set to 3RPM, the second stage is 5RPM, the third stage is 6RPM, the fourth stage is 9RPM, the fifth stage is 12RPM.

On the other hand, when the user wants to produce a large amount of snow production within a short time, if you press the speed switch 60 five times to rotate to 12 RPM of five stages, then the speed switch 60 according to the situation Press to adjust the speed to increase or decrease the production. (S50)

That is, when the ice-making switch 6 is rotated by pressing the ice type switch 58, the snow lamp 66 of the front panel 64 of the case 62 is turned on, and the user checks the snow lamp 66. As a result, it is recognized that it is operating normally.

Then, when the microcomputer 20 supplies the refrigerant gas generated by operating the refrigeration apparatus 14 according to the preset information (S50) through the refrigerant supply port 36 of the refrigerant circulation path tube unit 8, the refrigerant gas is After being introduced through the refrigerant supply passage 32 and assembled to the discharge port 28, the refrigerant is injected into the ice making drum 6 through the capillary tube 29 wound several times and evaporated.

Accordingly, the ice making drum 6 is immersed in the water supply tank 4 while being frozen and rotated in a state where an ice layer is formed on the outer circumferential surface, and the cutting knife 12 makes the surface of the ice passing through very thin. By cutting snow type powder ice is produced (S60).

When the snow type powder ice is produced by the rotation of the ice making drum 6 and is accumulated by a predetermined amount in the ice making room 76, the production sensor 54 detects this and sends an electric signal to the microcomputer 20. After the application, the microcomputer 20 temporarily stops the driving motor 13 and the refrigerating device 14 (S70).

At this time, the drive motor 13 and the freezing device 14 are stopped by the microcomputer 20 that detects the limited production amount of the snow type powder ice by the production sensor 54 and at the same time, the output of the front panel of the case 62. As the full lamp 72 is turned on, the user is informed that the snow is in the ice making room 76 and is temporarily suspended (S70).

Then, when the microcomputer 20 detects and determines that the amount of snow-type powder ice in the ice making room 76 decreases again, the driving motor 13 and the freezing device 14 are operated to produce snow. The production and stopping of this snow type powder ice is repeated. (S80)

On the other hand, if the ice type switch 58 is pressed again twice, the microcomputer 20 determines to be in flake mode and stops the ice making drum 6 for 1 minute and repeats the control for 3 seconds (S80).

Simultaneously with the flake production control driving of the ice making drum 6, the flake lamp 68 of the case front panel 64 lights up to inform the user that flake ice production control is normally performed. (S80)

The ice in the thick state on the ice making drum (6) is broken by the cutting knife 12 during the rotation for 3 seconds while coming off the ice making drum (6) to provide a flake-like ice to the consumer (S80) You can do it.

In the flake ice production control drive of the ice making drum 6, the control by the speed switch 60 is blocked by the microcomputer 20 so as not to be performed.

The production of the flake ice is also detected by the production sensor 54, and when the production limit is stopped, the driving motor 13 or the freezing device 14 is stopped and driven again when the produced flake ice is reduced. The microcomputer 20 is repeated control (S90).

The capillary tube 29 is wound around the refrigerant circulation path pipe part 8 in the ice making drum 6 of the ice manufacturing apparatus 2 of various forms formed as described above, and the refrigerant gas is formed in the inner circumferential surface of the ice making drum 6 and the refrigerant circulation path pipe part ( 8) A certain space is provided to increase the evaporation rate of the refrigerant to diffuse, and evenly distribute the cooling temperature to produce a high quality snow type powder ice or flake ice.

The various types of ice manufacturing apparatus and the control method of the present invention is a snow-type powder ice, the deformation or modification within the scope of the technical scope of the control of the rotation drum and the production control means in the production of flake-shaped ice is within the scope of the present invention Belonging to and thus violating the rights of the present invention.

 The snow-type powder ice produced by the present invention as described above is produced softly by cutting the oxygen as bubbles are generated between the powder during cutting, there is no effect of stomach or head pain due to cold even if the consumer ingests .

In addition, it is easy to manufacture, assemble and repair in the installation of the refrigerant circulation path pipe using the seal spindle part in the ice making drum, and seal the refrigerant by blocking the interference on the sealing force by applying the seal spindle part to prevent the refrigerant leakage from the ice making drum. There is an effect of improving the sealing force of the seal.

When the ice type switch is pressed once in the various types of ice manufacturing apparatus, the microcomputer recognizes the production of snow type powder ice and rotates the driving motor. At this time, the rotation speed is based on the number of times of pressing the speed switch. Since any stage is selected and rotates according to the stage, the production volume can be arbitrarily controlled.The ice-making drum can be stopped for 1 minute, rotated for 3 seconds, and then cut with a cutting knife. It is to be produced, and it is a useful invention in the ice-making and food materials industry because it has the effect of enabling the automatic production control of the flake ice by enabling the operation and stopping and reactivation according to the production amount.

Claims (4)

A water supply tank in which supply water is filled by a solenoid valve installed in the water supply pipe, a hollow ice-making drum disposed to be locked to the water supply tank to a predetermined depth and rotated by a driving motor, and the ice-making drum penetrates from one side to evaporate refrigerant. A coolant circulation path pipe part provided to be generated, a seal spindle part installed while the refrigerant circulation path pipe part is sealed to the ice making drum, and a cutting knife spaced apart by a predetermined gap from the ice making drum surface, and the refrigerant circulation path pipe part. A detection unit comprising a refrigeration unit installed to supply and discharge refrigerant gas in the air, a supply level sensor for detecting a water level in the water supply tank, the ice-making drum drive motor, and a power switch for supplying power to the refrigerating device; Product selection switch to select snow, ice and flake ice, and control the speed of ice making drum A switch unit comprising a speed switch, and an installed microcomputer for controlling the drive of the ice making drum, the water supply, the water supply, and the refrigerating device by preset information by electrical signals of the switch unit and the sensing unit. In the ice powder manufacturing apparatus made of, Located at the front switch panel of the case to check the operation of the switch unit, and install a snow lamp, flake lamp, supply water level lamp, output full lamp, The detection unit is manufactured by manufacturing a variety of ice, characterized in that the production sensor is further installed on one side of the ice-making room to recognize the microcomputer based on the predetermined information of the production amount of the snow-type powder ice and flake-shaped ice cut by the cutting knife Device. Turning on the power to various types of ice making apparatus to turn on the supply water check lamp and determining the presence or absence of the supply water in the water supply tank using the supply water level sensor (S10); After checking whether the water supply in the water supply tank is filled with the electric signal by variable opening and closing the solenoid valve of the water supply pipe (S20) and Detecting an operation of an ice type switch for selecting a snow mode and a flake mode after determining the filling of the feed water in the water supply tank (S30); In step S40 of controlling the snow mode at the same time as the snow lamp is turned on when the ice type switch is pressed once, If the speed switch operation is not detected after the snow mode is selected, while rotating the drive motor with 3 RPM, which is the first step out of five steps, if the operation is detected, the rotation speed is increased by one step to control the rotation and operate the refrigerating device (S50). Wow, Detecting the accumulated ice in the ice-making chamber of the snow amount cut by the cutting knife from the ice-making drum by the driving motor and the refrigerating device (S60); And stopping the driving motor and the refrigerating device at the same time when the output full lamp is turned on when the output sensor detects the output sensor, and repeatedly controlling that the reduction of the load in the ice making chamber is restarted when the output sensor is detected (S70); In step S80, when the ice-type switch is pressed twice, the flake lamp is turned on and the ice making drum is stopped for 1 minute and then the flakes are controlled by the flake mode which repeatedly drives the driving motor by rotating for 3 seconds. When the production of the flakes, when the output pool is detected by the production sensor, the output of the full lamp is turned on at the same time stopping the drive motor and the freezing device, and if the decrease in the ice-making load is again detected by the production sensor to repeat the control step ( S90), the control method of the various ice making apparatus, characterized in that controlled. According to claim 2, When the operation of the speed switch is sensed for each push operation 1 step 3RPM, 2RPM 5RPM, 3RPG 6RPM, 4RPM 9RPM, 5RPG step by step 12RPM Control method of various ice making apparatus, characterized in that to control the rotation of the motor. The method of claim 2, wherein the rotation speed control of the ice making drum is variable, so that at least one of a snow type ice powder and flake ice can be selected and produced.

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