JP4073083B2 - Auger ice machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auger type ice maker that freezes ice making water supplied into a freezing cylinder to produce flake ice.
[0002]
[Prior art]
In an auger type ice making machine, ice making water is continuously supplied and is always in an ice making state. Basically, ice freezes while leaving impurities such as calcium and magnesium in the ice making water, so if ice making is continued, these impurities of high concentration are concentrated in the ice making water. Such an impurity is called a scale, and when the scale concentration is high, it adheres to a drain pipe or the like and clogs the pipe or causes water leakage.
For this reason, for example, Japanese Patent Publication No. 3-4828 and Japanese Patent Publication No. Sho 62-8707 disclose a technique for opening a drain valve in order to remove scale in an auger type ice making machine.
[0003]
[Problems to be solved by the invention]
The opening of the drain valve for removing scales disclosed in these publications is for discharging purified water having a high scale concentration in the freezing cylinder and simultaneously supplying new water from the ice making water tank to the freezing cylinder. . Therefore, in such a cleaning system, the scale is not completely removed but is diluted with new water supply and remains in the freezing cylinder. In addition, considering that the remaining scale is completely removed, a considerably large amount of water is required to replace purified water. Furthermore, it takes a very long time to remove the scale.
[0004]
The present invention has been made in order to solve the problems contained in such conventional techniques. The object is to provide an auger type ice making machine capable of quickly and reliably discharging purified water having a high scale concentration.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an auger type ice making machine according to claim 1 is provided with a water supply valve provided in the middle of a water supply pipe based on the detection value of a water level detection means while receiving the supply of ice making water from the outside through the water supply pipe. An ice making water tank that controls the opening and adjusts the amount of water supply, a freezing cylinder that receives ice making water from the ice making water tank and that is cooled by a cooling unit provided on the outer periphery to generate ice from the ice making water, and a freezing An auger that is rotatably arranged inside the cylinder and conveys the generated ice, a driving means that imparts a rotational force to the auger, and a drain valve that extends from the lower part of the freezing cylinder to discharge ice making water. in the auger type ice making machine having a provided drainage pipe, during washing mode of the drainage tube, once drained ice-making water in the freezing cylinder to open the drain valve with closed the water supply valve 1 state, after draining ice-making water in the first state, the second state in which the water supply valve is opened again for a predetermined time while the drain valve remains open, and after the elapse of a predetermined time in the second state, Control means for controlling to a third state in which the drain valve is closed is provided .
In the auger type ice making machine according to the first aspect, in the state where the scale concentration is high, the mode is shifted to the drain pipe cleaning mode. The cleaning mode is changed periodically or as required by the user. First, the water supply valve is closed to stop water supply. The closing timing of the water supply valve may or may not take into account the water level in the ice making water tank. In this state, the drain valve is opened, and the ice making water in the freezing cylinder is drained from the drain pipe. Then, the ice making water with a high scale concentration is drained. After draining the ice making water, the water supply valve is opened again for a predetermined time while the drain valve remains open. This removes the scale of the water pipe quickly and reliably. The opening timing of the water supply valve at this time may be the stage where the ice making water is completely drained or the stage where the ice making water is not yet completely drained. In short, it is sufficient that only ice-making water having a high scale concentration is discharged without water supply. Here, the predetermined time for opening the water supply valve may be a time measured by a timer or a time based on some detection means, for example, a water level detection means. When the water supply valve is opened for a predetermined time, the drain valve is closed and the normal ice making operation is resumed.
The auger type ice making machine according to claim 2 is characterized in that, in the auger type ice making machine according to claim 1, the driving means is stopped in the cleaning mode. If constituted in this way, in addition to the operation of the invention of claim 1, the auger is not driven in a situation where ice making water is insufficient.
[0006]
The auger type ice making machine according to claim 3 receives the supply of ice making water from the outside through the water supply pipe and controls the opening of a water supply valve provided in the middle of the water supply pipe based on the detected value of the water level detecting means. An ice-making water tank that adjusts the temperature, a supply of ice-making water from the ice-making water tank, a freezing cylinder that is cooled by a cooling unit provided on the outer periphery to generate ice from the ice-making water, and is rotatable inside the freezing cylinder An auger that conveys the generated and formed ice, a driving means that imparts a rotational force to the auger, and a drain pipe that is extended from the bottom of the freezing cylinder and is provided with a drain valve in the middle for discharging ice-making water. in the auger type ice making machine, during washing mode of said drain pipe, a first state for draining the ice-making water to open the drain valve in said freezing cylinder, the water supply direction switches the ice-making water in the ice-making water tank Leads to the water injection pump direction by stage, characterized in that it comprises a second state for supplying pressurized water to the upstream side of the discharge valve of the water discharge pipe by water injection pump, a control means for controlling the.
In the auger type ice making machine according to the third aspect, in the state where the scale concentration is high, the mode is shifted to the drain pipe cleaning mode. The cleaning mode is changed periodically or as required by the user. First, the drain valve is opened, and the ice making water in the freezing cylinder is drained from the drain pipe. Then, the ice making water with a high scale concentration is drained. At this time, it does not matter whether the water supply valve is closed to stop the water supply. On the other hand, the direction of the ice making water in the ice making water tank is switched from the freezing cylinder direction to the water injection pump direction by the water supply direction switching means, and the pressure water pressurized by the water injection pump is sent to the drain pipe upstream of the drain valve. . This pressure water removes the scale of the drain pipe quickly and reliably.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of an auger type ice making machine embodying the present invention will be described with reference to FIGS.
(Embodiment 1)
As shown in FIG. 1, an auger 12 is housed inside a stainless steel freezing cylinder 11. The stainless auger 12 has a spiral auger blade 13 formed around it. A geared motor 16 is disposed on the base 15. The geared motor 16 decelerates the rotational force of the motor by a reduction device provided inside. The motor in the present embodiment is driven by a single-phase 100V, and a parallel shaft spur gear three-stage system is adopted as the speed reduction mechanism of the speed reduction device. The auger 12 is connected to a speed reduction mechanism (not shown) through a spline joint 19. The auger 12 rotates slowly around the axis in the freezing cylinder 11, scrapes off the ice formed on the inner wall 11a of the freezing cylinder 11 and pushes it upward.
[0008]
A copper cooling pipe 21 is wound around the outer periphery of the freezing cylinder 11 and fixed by soldering. The cooling pipe 21 as a cooler is connected to a cooling circuit 25 described later, and refrigerant is supplied from the cooling circuit. As the refrigerant in the cooling pipe 21 evaporates, the heat of vaporization is taken away, so that the temperature of the freezing cylinder 11 is lowered, and ice making water is frozen on the freezing cylinder inner wall 11a. The freezing cylinder 11 and the cooling pipe 21 are surrounded by a cylindrical heat insulator 20. A refrigeration casing 26 is constituted by the refrigeration cylinder 11, the cooling pipe 21 and the heat insulator 20.
A dew tray 22 is disposed above the freezing cylinder 11. An ice melting heater 27 is wound on the outer periphery of the freezing cylinder 11 above the dew tray 22. The ice melting heater 27 is in an ON state at the time of ice making, and there is a communication hole (not shown) that melts excess ice remaining in the upper part of the freezing cylinder 11 and communicates the inside of the freezing cylinder 11 formed in the upper part of the freezing cylinder 11 with the outside air. Prevent clogging with excess ice.
[0009]
An ice compression head 28 is mounted above the dew tray 22. A synthetic resin bearing (not shown) that rotatably supports the upper end of the auger 12 is fitted inside the ice compression head 28. A cutter 29 is fixed to the top of the auger 12 and rotates according to the rotation of the auger 12. The sherbet-like ice pushed upward by the auger 12 is hardened by the ice compression head 28, cut into flakes by the cutter 29, and discharged from the base end of the ice discharge portion 30 toward an ice storage tank (not shown).
[0010]
The freezing cylinder 11 is supplied with ice making water from an ice making water tank 31. The ice making water tank 31 is disposed at a predetermined height for supplying ice making water to the freezing cylinder 11, and the water levels of the ice making water tank 31 and the freezing cylinder 11 are always at the same level. A water supply pipe 34 connected to an external water pipe (not shown) is connected to the ice making water tank 31. The water supply pipe 34 is provided with a water supply valve 33 that adjusts water supply to the ice making water tank 31 by opening and closing the valve. The ice making water tank 31 is provided with a water level switch 32 as water level detecting means, and detects the water level in the ice making water tank 31. The water level switch 32 includes a high level detection unit 32a and a low level detection unit 32b, closes the water supply valve 33 based on the detection of the high level detection unit 32a, and opens the water supply valve 33 based on the detection of the low level detection unit 32b. . The ice making water tank 31 is provided with a communication hole 35 that communicates the outside air with the inside of the tank. The ice making water tank 31 is connected to the lower part of the freezing cylinder 11 through a water conduit 36.
A drain pipe 37 is connected to the lower part of the freezing cylinder 11. The drain pipe 37 guides and discharges the ice making water whose scale concentration in the freezing cylinder 11 is increased into the drain pan 38 in which the base 15 is installed. The drain pipe 37 is provided with a drain valve 39 for adjusting drainage by opening and closing the valve.
[0011]
Next, the cooling circuit 25 attached to the auger type ice making machine will be described.
As shown in FIG. 2, the auger type ice making machine is provided with a CFC cooling type cooling circuit 25. The cooling circuit 25 is configured by connecting a compressor 41, a condenser 42, a dryer 43, an expansion valve 44 and a cooling pipe 21 of the auger type ice making machine via a refrigerant delivery pipe 45.
The refrigerant flowing through the refrigerant delivery pipe 45 is vaporized by the cooling pipe 21 as the heat absorbing portion via the condenser 42, the dryer 43, and the expansion valve 44 in this order to cool the freezing cylinder 11 and then returned to the compressor 41 again.
The compressor 41 sucks and compresses the gaseous refrigerant gasified by the cooling pipe 21 and converts it into high-temperature and high-pressure gas. The condenser 42 is disposed downstream of the compressor 41 and has a finned heat radiation pipe (not shown). The high-temperature and high-pressure gaseous refrigerant introduced into the finned heat radiation pipe is cooled by the adjacent fan device 47 and condensed to be liquid. Refrigerant (which is still at high temperature and high pressure at this stage). The dryer 43 is disposed downstream of the condenser 42 and removes moisture in the refrigerant.
[0012]
The expansion valve 44 disposed upstream of the cooling pipe 21 expands the high-temperature / high-pressure refrigerant to lower the temperature and pressure to produce a low-temperature / low-pressure refrigerant. The valve 44 is connected to a temperature sensitive cylinder 48 provided near the outlet of the cooling pipe 21. The temperature sensing cylinder 48 detects the temperature rise (superheat degree (SuperHeat T (SH))) at the outlet of the cooling pipe 21. If the detected superheat degree (SH) exceeds a predetermined value, it passes through the valve 44. The amount of refrigerant to be increased is increased, and when the degree of superheat (SH) is equal to or less than a predetermined value, the amount of refrigerant passing through the valve 44 is decreased.
[0013]
Next, the electrical configuration of the auger type ice making machine will be described.
As shown in FIG. 3, a central processing unit (CPU) 51 is disposed inside a control device (not shown). The CPU 51 includes various programs and cleaning programs for controlling the auger type ice making machine, and a memory 52 for temporarily storing data. The CPU 51 is connected to the geared motor 16, the compressor 41, the fan device 47, the ice melting heater 27, the water supply valve 33, and the drain valve 39 through a drive circuit (not shown). Further, a water level switch 32, an ice storage amount sensor 55 for detecting an ice storage amount in an ice storage tank (not shown), a cleaning lamp 53 for informing that the cleaning mode is in effect, and a timer 54 are connected. Based on the cleaning program in the memory 52, the CPU 41 discharges the ice making water whose scale concentration in the freezing cylinder 11 has increased in a cycle of 15 minutes every 12 hours.
[0014]
The operation of such an auger type ice making machine will be described based on the timing chart of FIG.
When the power is turned on at T0, the CPU 651 first opens the water supply valve 33 to supply water into the ice making water tank 31. Further, the ice storage amount sensor 55 is turned on. That is, the state in which the ice storage amount sensor 55 does not detect ice (the ice storage tank is not full) is energized. The period from T0 to T1 is a preparation stage for supplying ice-making water into the ice-making water tank 31 and the freezing cylinder 11.
When the high level detector 32a of the water level switch 32 in the ice making water tank 31 detects that the water level is high at T1, the CPU 51 closes the water supply valve 33. Then, the drive of the geared motor 16, the fan device 47 and the ice melting heater 27 is started with a delay of 1 second.
Next, after 60 seconds have elapsed from T1, the driving of the compressor 41 is started at T2. After that, the ice is made. When ice making water is used for ice making and the ice making water in the ice making water tank 31 is reduced, the low level detecting unit 32b of the water level switch 32 detects that the water level is low at T3. Then, simultaneously with the detection of the detection signal, the CPU 51 opens the water supply valve 33 again to supply water into the ice making water tank 31.
When the high level detection unit 32a of the water level switch 32 detects again that the water level is high at T4, the CPU 51 closes the water supply valve 33 based on the detection signal. Thereafter, the ice is continuously made by repeating this process.
[0015]
When the ice storage amount sensor 55 is turned off at T5, the CPU 51 stops driving the geared motor 16, the fan device 47, the ice melting heater 27, and the compressor 41 seven seconds after that time, assuming that the ice storage tank is full. As a result, the ice making operation is temporarily suspended.
When the ice storage amount sensor 55 is turned on again at T6 (the time from T5 to T6 is a time zone in which the ice storage tank is full and fluctuates depending on the ice usage state), the ice has been used and decreased. In order to resume the ice making operation, the CPU 51 restarts the geared motor 16, the fan device 47, and the ice melting heater 27 after 7 seconds, and the compressor 41 restarts after 60 seconds. Then, ice making is continued while adjusting the water level based on the detection of the water level switch 32 again.
[0016]
Now, at T7, the CPU 51 controls the cleaning mode based on the operation of the timer 54. Thereafter, the cleaning mode is set for 15 minutes. If the water supply valve 33 is closed at this stage, the normal operation is continued until the low level detection part 32b of the water level switch 32 detects that the water level is low (T8), and the water supply valve 33 is opened to supply water. If there is, the normal operation is continued until the water supply valve 33 is closed again until the low level detecting unit 32b detects that the water level is low (that is, until the water level once becomes high and then low).
When the low level detector 32b of the water level switch 32 detects that the water level is low at T8, the drive of the compressor 41 is first stopped at T9. Next, at T10, the CPU 51 opens the drain valve 39 instead of the water supply valve 33. As a result, drainage without water supply is started. At the same time, the driving of the geared motor 16, the fan device 47 and the ice melting heater 27 is stopped and the cleaning lamp 53 is turned on to notify the outside that the cleaning mode is in effect.
[0017]
Next, the CPU 51 opens the water supply valve 33 at T11 180 seconds after T10. In the present embodiment, the completion of drainage of ice-making water under conditions where no water is supplied is set 180 seconds after T10. In this state, since the drain valve 39 is still open, the water supply is not stored in the freezing cylinder 11 but is drained from the drain valve 39 as it is. When it is determined at T12 that 15 minutes have elapsed based on the operation of the timer 54 and the cleaning is completed, the CPU 51 closes the drain valve 39 and turns off the cleaning lamp 53. The ice making water is gradually stored in the freezing cylinder 11 and the ice making water tank 31 which are once emptied by closing the drain valve 39.
When the water level in the ice making water tank 31 becomes high and the high level detection unit 32a of the water level switch 32 detects that the water level is high at T13, the CPU 51 closes the water supply valve 33 based on the detection signal. And the drive of the geared motor 16, the fan apparatus 47, and the ice melting heater 27 is started 1 second behind T13.
Next, after 60 seconds have elapsed from T13, the drive of the compressor 41 is started at T14. Thereafter, the normal ice-making state is resumed.
[0018]
(Embodiment 2)
The second embodiment will be described with reference to FIGS. Since the cooling circuit in the second embodiment is the same as that in the first embodiment, the description thereof is omitted. 5 are the same as those in the first embodiment, the same components are denoted by the same reference numerals as those in FIG. 1, and the description thereof is omitted.
In the auger type ice making machine of the second embodiment, the ice making water tank 31 is connected to the lower part of the freezing cylinder 11 via the first water conduit 61. A switching valve 62 is provided in the middle of the first water conduit 61. The switching valve 62 switches the outflow direction of the ice making water in the ice making water tank 31 sent in the direction of the first water guiding pipe 61 to the direction of the second water guiding pipe 63 in the cleaning mode, and ice making is performed in any of the water guiding pipes 61 and 63. The three-way switching valve prevents the water from flowing out. A pump 65 is provided in the middle of the second water conduit 63. The pump 65 applies pressure to the ice making water supplied from the switching valve 62 in the cleaning mode, and actively sends it out as pressure water toward the freezing cylinder 11.
[0019]
Next, the electrical configuration of the auger type ice making machine of the embodiment will be described.
In addition to the electrical configuration of the first embodiment, a switching valve 62 and a pump 65 are connected to the CPU 51 via a drive circuit (not shown). Based on the cleaning program in the memory 52, the CPU 41 discharges the ice making water whose scale concentration in the freezing cylinder 11 is increased in a cycle of 20 minutes every 12 hours.
[0020]
The operation of such an auger type ice making machine will be described based on the timing chart of FIG.
Since the operation from T0 to T6 is the same as that of the first embodiment, the description is omitted. In the second embodiment, the operation of the switching valve 62 and the pump 65 is added. However, since these are operated only in the cleaning mode, they are not involved in the operations from T0 to T6.
[0021]
Now, at T7, the CPU 51 controls the cleaning mode based on the operation of the timer 54. Thereafter, the cleaning mode is set for 20 minutes. If the water supply valve 33 is closed at this stage, the normal operation is continued until the low level detection part 32b of the water level switch 32 detects that the water level is low (T8), and the water supply valve 33 is opened to supply water. If there is, the normal operation is continued until the water supply valve 33 is closed again until the low level detecting unit 32b detects that the water level is low (that is, until the water level once becomes high and then low).
When the low level detector 32b of the water level switch 32 detects that the water level is low at T8, the drive of the compressor 31 is first stopped at T9. Next, at T10, the CPU 51 opens the drain valve 39 instead of the water supply valve 33. As a result, drainage without water supply is started. At the same time, the driving of the geared motor 16, the fan device 47 and the ice melting heater 27 is stopped and the cleaning lamp 53 is turned on to notify the outside that the cleaning mode is in effect.
[0022]
Next, the CPU 51 opens the water supply valve 33 at T11 180 seconds after T10. In the present embodiment, the completion of drainage of ice-making water under conditions where no water is supplied is set 180 seconds after T10. Simultaneously with the opening of the water supply valve 33, the switching valve 62 is switched to the position V2, that is, the position where ice-making water does not flow into the first and second water conduits 61, 63. Then, the ice making water does not flow downstream from the switching valve 62 (that is, in the cleaning mode, the drainage from the drain pipe 37 is temporarily stopped), and the ice making water is stored in the ice making water tank 31.
When detecting that the high level detection unit 32a of the water level switch 32 is at the high water level at T12, the CPU 51 causes the switching valve 62 to flow to the position of V3, that is, the ice making water flows toward the second water conduit 63 based on the detection signal. Switch to. On the other hand, 3 seconds after T12, the CPU 51 drives the pump 65. By driving the pump 65, the pressure water is guided to the drain pipe 37 via the first water conduit 61 and the drain pipe 37 is cleaned.
[0023]
When the timer 54 is activated and the cleaning mode is finished at T13, the CPU 51 switches the switching valve 62 to the position V1, that is, toward the first water conduit 61, and stops supplying ice-making water (washing water) to the pump 65. At the same time, the drain valve 39 is closed and the cleaning lamp 53 is turned off. Then, after 3 seconds from T13, the CPU 51 stops the driving of the pump 65.
When the water level in the ice making water tank 31 becomes high and the high level detection unit 32a of the water level switch 32 detects that the water level is high at T14, the CPU 51 closes the water supply valve 33 based on the detection signal. And the drive of the geared motor 16, the fan apparatus 47, and the ice melting heater 27 is started 1 second behind T14.
Next, 60 seconds after T14, the drive of the compressor 41 is started at T15. Thereafter, the normal ice-making state is resumed.
[0024]
In the auger type ice making machine of the first and second embodiments configured as described above, the following operational effects are produced.
Since the water with high scale concentration remaining in the drain pipe 37 is washed away cleanly, the scale does not adhere to the drain pipe 37. As a result, problems associated with scale adhesion are eliminated.
In addition, once the water supply valve 33 is closed and all the ice making water inside is drained, and then the drain pipe 37 is washed with new water, the water with a high concentration of the scale is not diluted and remains. Adhesion prevention effect is improved. In addition, when new water is supplied after discharging all the water with a high scale concentration, the amount of water required for cleaning is smaller than when water is constantly supplied.
Furthermore, the auger type ice making machine is provided with a drain pan 38 to receive water leakage and dew condensation water, but since the drainage at the time of washing is drained from the drain pipe 37 to the drain pan 38, there is no need to prepare another pan. Can be washed.
Further, since the geared motor 16 is also stopped at the time of cleaning, a member (for example, a mechanical seal portion) of the geared motor 16 is not worn even if there is no ice making water performing a lubricating function.
Furthermore, since the ice making water tank 31 is provided with a communication hole 35 for communicating outside air with the inside of the tank, the ice making water flows out of the tank 31 smoothly. Similarly, the ice making water in the freezing cylinder 11 is provided with a communication hole (not shown), so that the ice making water flows out of the freezing cylinder 11 smoothly.
[0025]
In the second embodiment, since the drain pipe 37 can be washed with pressure water, scale adhesion is further prevented.
It should be noted that the present invention can be modified and embodied as follows.
In the second embodiment, the switching valve 62 is set to the position V2 (see FIG. 7), ice making water is once stored in the ice making water tank 31, and water for washing is secured, and then the switching valve 62 is moved in the direction of the pump 65. I was trying to switch. However, if the cleaning water can be supplied to the pump 65, it is not necessary to store the cleaning water in this way.
Moreover, in the said embodiment, the water in the freezing cylinder 11 and the ice making water tank 31 was once drained completely at the time of washing | cleaning. However, the drain valve 39 may be closed while some ice-making water remains. The point is that it is sufficient to effectively drain ice-making water with a high concentration of scale.
Further, in the above embodiment, the timer 54 determines the end of cleaning with pressure water by the pump 65. However, the cleaning with the pressure water may be terminated based on detecting that the low level detection unit 32b of the water level switch 32 is at the low water level as the determining means.
In the above embodiment, the cleaning is performed in a predetermined cycle based on the cleaning program of the CPU 51. However, the worker may input the cleaning switch himself to set the cleaning mode. In addition, it is free to implement in a mode that does not depart from the spirit of the present invention.
[0026]
【The invention's effect】
As described above, in the first aspect of the invention, the water supply pipe is closed and only ice-making water having a high scale concentration is discharged without newly supplying water to the ice-making water tank, and then the drain pipe is washed with new washing water. Efficient and high-scale ice making water can be discharged reliably.
In addition, in the invention of claim 2, in addition to the effect of the invention of claim 1, there is no need to drive the drive means for rotating the auger with a small amount of ice making water as a lubricant. Hateful.
Furthermore, in the invention of claim 3, since the pressure water can be flowed to the drain pipe by the water injection pump, the scale is prevented from adhering to the drain pipe.
[0027]
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an auger type ice making machine according to Embodiment 1 of the present invention.
FIG. 2 is a schematic cross-sectional view that includes the cooling circuit of the first embodiment.
FIG. 3 is a block diagram for explaining the electrical configuration of the first embodiment.
FIG. 4 is a timing chart of the first embodiment.
FIG. 5 is a schematic cross-sectional view of an auger type ice making machine according to Embodiment 2 of the present invention.
FIG. 6 is a block diagram for explaining the electrical configuration of the second embodiment .
FIG. 7 is a timing chart of the same second embodiment .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Freezing cylinder, 12 ... Auger, 16 ... Drive motor as drive means, 31 ... Ice making water tank, 37 ... Drain pipe, 39 ... Drain valve, 62 ... Switching valve, 65 ... Pump

Claims (3)

An ice making water tank that receives the supply of ice making water from the outside through the water supply pipe and controls the opening of a water supply valve provided in the middle of the water supply pipe based on the detection value of the water level detection means to adjust the water supply amount, and the ice making water tank A freezing cylinder that is supplied with ice-making water from the outside and that is cooled by a cooling unit provided on the outer periphery to generate ice from the ice-making water, an auger that is rotatably disposed inside the freezing cylinder and conveys the generated ice, In an auger type ice making machine having a driving means for applying a rotational force to the auger and a drain pipe extending from the lower part of the freezing cylinder for discharging ice making water and provided with a drain valve in the middle thereof,
During the cleaning mode of the drain pipe,
A first state in which the water supply valve is once closed and the drain valve is opened to drain the ice making water in the freezing cylinder;
A second state in which the water supply valve is opened again for a predetermined time after the ice-making water is drained in the first state, while the drain valve remains open;
An auger type ice making machine comprising control means for controlling to a third state in which the drain valve is closed after a lapse of a predetermined time in the second state . 2. The auger type ice making machine according to claim 1, wherein the driving means is stopped during the cleaning mode. An ice making water tank that receives the supply of ice making water from the outside through the water supply pipe and controls the opening of a water supply valve provided in the middle of the water supply pipe based on the detection value of the water level detection means to adjust the water supply amount, and the ice making water tank A freezing cylinder that is supplied with ice-making water from the outside and that is cooled by a cooling unit provided on the outer periphery to generate ice from the ice-making water, an auger that is rotatably disposed inside the freezing cylinder and conveys the generated ice, In an auger type ice making machine having a driving means for applying a rotational force to the auger and a drain pipe extending from the lower part of the freezing cylinder for discharging ice making water and provided with a drain valve in the middle thereof,
During the cleaning mode of the drain pipe,
A first state in which the drain valve is opened to drain the ice making water in the freezing cylinder;
Control means for controlling the ice-making water in the ice-making water tank to the water injection pump direction by the water supply direction switching means and to supply the pressure water to the upstream side of the drain valve of the drain pipe by the water injection pump. auger type ice making machine, characterized in that it comprises a.

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