JP5811824B2 - Ice making equipment - Google Patents

Description

  The present invention relates to an ice making device applied to a beverage supply device such as a cup-type vending machine.

  2. Description of the Related Art Beverage supply devices such as cup-type vending machines have already been provided with an ice making device built in and ice provided by an ice making device is provided together with a beverage. This type of ice making apparatus is equipped with an ice making refrigeration circuit comprising a compressor, a condenser, an expander and an ice making evaporator. Ice is produced in an ice making unit incorporating the ice making evaporator, and the produced ice is produced. Are stored in an ice storage tank.

  The ice storage tank is provided with an ice detection sensor. When it is detected by the ice detection sensor that the height of ice stored in the ice storage tank has reached a preset upper limit, the compressor of the ice making refrigeration circuit is stopped and the ice making operation is interrupted. . On the other hand, when the amount of ice stored in the ice storage tank decreases and this is detected by the ice detection sensor, the compressor is driven and the ice making operation resumes until the upper limit is detected again by the ice detection sensor. (See, for example, Patent Document 1).

Japanese Patent Application No. 2010-169304 (paragraph “0016”)

  By the way, when the ice detection sensor for detecting the upper limit height of the stored ice as described above and the ice detection sensor for detecting a decrease in the amount of ice stored are shared, it is possible to reduce the manufacturing cost. Become. However, since the decrease in the ice storage amount is detected immediately after the ice storage amount falls below the upper limit value, if the ice making operation is restarted immediately in response to this, the ice detection sensor will be chattered. As a result, the compressor of the refrigeration circuit repeatedly stops driving in a short time, which is not preferable for energy saving.

  In order to solve such a problem, for example, when it is detected by the ice detection sensor that the ice storage amount is below the upper limit value, it is conceivable that the ice making operation is resumed after a preset delay time has elapsed.

  According to such a control method, the refrigeration circuit does not repeatedly stop driving in a short time, and the operation interval of the ice making operation becomes longer by setting a longer delay time, which contributes to energy saving. . However, when the ambient temperature is high, such as in the summer, the heat entering the ice storage tank also increases, so the rate of decrease in the amount of ice storage tends to increase. In addition, since the demand for ice as a beverage increases, there is a risk of hindering the provision of iced beverages.

  In view of the above circumstances, an object of the present invention is to provide an ice making device that can save energy and reduce manufacturing costs without hindering the provision of ice.

  In order to achieve the above object, an ice making device according to the present invention drives a compressor when a drive signal is given, and circulates a refrigerant between a condenser, an expander, and an ice making evaporator, thereby An ice making refrigeration circuit for generating ice in an ice making unit incorporating an ice making evaporator, an ice storage unit for sequentially storing ice generated in the ice making unit, and an ice storage amount of the ice storage unit at a preset upper limit height An ice detecting means for detecting when the temperature has reached, an external temperature detecting means for detecting an ambient temperature around the ice storage unit, the compression result based on the detection result of the ice detecting means and the detection result of the external temperature detecting means. An ice making device comprising: a control means for controlling the drive of the machine, wherein the control means sets a start determination time according to a detection result of the external temperature detection means; and the ice detection Said ice storage by means When it is detected that the amount of stored ice is below the upper limit height, it is monitored whether the non-upper limit state below the upper limit height continues for the start determination time set by the start determination time setting unit, A drive signal output unit that outputs a drive signal to the compressor when the duration of the non-upper limit state reaches the start determination time, and the start determination time setting unit is detected by the external temperature detection means The start determination time is set shorter as the temperature is higher.

  In the ice making device described above, the ice storage unit is configured to discharge a predetermined amount of ice to the outside each time a payout signal is given, and the drive signal output The section outputs a drive signal to the compressor without waiting for the elapse of the start determination time when the non-upper limit state is detected by the ice detecting means after the ice is discharged from the ice storage section according to the payout signal. It is characterized by.

  Further, according to the present invention, in the ice making device described above, the control unit includes an end determination time setting unit that sets an end duration according to a detection result of the external temperature detection unit, and the compressor through the drive signal output unit. When the ice detecting means detects that the ice storage amount of the ice storage unit has reached the upper limit height, the upper limit reaching state that has reached the upper limit is set in the end determination time setting unit. And having a stop signal output unit for outputting a stop signal to the compressor when the duration of the upper limit reached state reaches the end determination time. Features.

  Further, the present invention is the ice making device described above, wherein the ice making refrigeration circuit includes an ice making refrigerant supply valve in a refrigerant supply passage from the expander to the ice making evaporator, and the control means Opens the ice making refrigerant supply valve simultaneously with the driving of the compressor to enable the circulation of the refrigerant, while a stop signal is output to the compressor through the stop signal output unit. It has the refrigerant | coolant supply control part which maintains the state which opened the said ice-making refrigerant | coolant supply valve continuously only for the open time after a stop.

  According to the present invention, the start determination time is set according to the temperature detected by the external temperature detecting means. Therefore, when the ambient external temperature of the ice storage unit is high, the ice making process waits for a relatively short start determination time. The operation is resumed. On the other hand, when the ambient external temperature is low, the ice making operation is resumed after a relatively long start determination time. As a result, even if the manufacturing cost is reduced by providing only the external temperature detecting means, it is possible to save energy without causing any trouble in providing ice.

FIG. 1 is a diagram showing an ice making device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control system of the ice making device shown in FIG. FIG. 3 is a timing chart showing operation timings of an ice detection sensor, a chipper motor, a compressor, an ice making refrigerant supply valve, an aquarium refrigerant supply valve, a blower fan, and an electronic expansion valve applied to the ice making device shown in FIG. is there.

  Hereinafter, preferred embodiments of an ice making device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an ice making apparatus according to an embodiment of the present invention. The ice making apparatus exemplified here is mounted on a vending machine for cup-type beverages, and is used to generate ice provided together with the beverage, and includes an ice making refrigeration circuit 10. The ice making refrigeration circuit 10 connects a compressor 11, a condenser 12, an electronic expansion valve (expander) 13, and an ice making evaporator 14 by a circulation supply passage 15, and a refrigerant, for example, carbon dioxide is interposed therebetween. The ice making evaporator 14 is configured to obtain cold heat by circulation. The ice making evaporator 14 according to the present embodiment is built in an auger type ice making unit 20 and has a function of cooling drinking water supplied from a drinking water tank (not shown) to produce ice. . The ice generated in the ice making unit 20 is sequentially sent upward from the driving of the chipper motor 21 and stored from below in an ice storage tank 30 provided in the upper part of the ice making unit 20.

  The ice storage tank 30 is provided with an ice detection sensor (ice detection means) 31 and a payout passage 32. When the ice stored in the ice storage tank 30 detects an “upper limit state” in which the ice has reached a preset upper limit height, the ice detection sensor 31 detects a detection signal to a main control unit (control means) 100 described later. Is output. The detection signal from the ice detection sensor 31 keeps being continuously output (ON) while the ice reaches the upper limit height, and the ice height is lower than the upper limit height. Is immediately stopped (OFF). The payout passage 32 is a passage for paying out the ice stored in the ice storage tank 30 to the outside. The payout passage 32 is provided with a gate 34 for opening and closing the payout opening 32 a by the gate actuator 33. The gate actuator 33 maintains the state where the gate 34 closes the payout port 32a of the payout passage 32 in the normal state, and only when the payout signal is output from the main control unit 100 described later, the gate outlet 32a of the payout passage 32 is provided. Open. When the payout signal is no longer output, the gate 34 is returned to the closed position by the gate actuator 33, and the state is maintained.

  The ice making refrigeration circuit 10 is provided with an internal heat exchanger 16 and an aquarium refrigeration circuit 40. The internal heat exchanger 16 brings the circulation supply passage 15 from the condenser 12 to the electronic expansion valve 13 close to the circulation supply passage 15 from the ice making evaporator 14 to the compressor 11, and heat exchange can be performed between them. It is configured to be possible.

  The water tank refrigeration circuit 40 shares the compressor 11, the condenser 12 and the electronic expansion valve 13 with the ice making refrigeration circuit 10, and only the water tank evaporator 41 is prepared individually. More specifically, the circulation supply passage 15 extending from the electronic expansion valve 13 to the ice making evaporator 14 has a branching point 42 and joins the circulation supply passage 15 extending from the ice making evaporator 14 to the internal heat exchanger 16. A water tank evaporator 41 is provided so as to have a point 43, and the water tank evaporator 41 and the ice making evaporator 14 are connected in parallel to the common compressor 11, condenser 12 and electronic expansion valve 13. It is. The water tank evaporator 41 is disposed in a state of being immersed in the cooling water 45 of the cooling water tank 44, forms the ice bank 46 by the cold heat when the refrigerant is supplied, and the cooling water is supplied via the ice bank 46. It functions to maintain a temperature of 45 at about 0 ° C.

  Refrigerant supply valves 17 and 47 are provided in a portion from the branch point 42 to the ice making evaporator 14 and a portion from the branch point 42 to the water tank evaporator 41 in the circulation supply passage 15, respectively. These refrigerant supply valves 17 and 47 are electromagnetic valves that open and close when a drive signal is given from the main control unit 100 to be described later, and control supply of refrigerant to the ice making evaporator 14 and the water tank evaporator 41. is there. In the following, for convenience, the refrigerant supply valve provided in the portion reaching the ice making evaporator 14 is referred to as the ice making refrigerant supply valve 17, and the refrigerant supply valve provided in the portion reaching the water tank evaporator 41 is supplied to the water tank refrigerant supply. They are referred to as valve 47 to distinguish them.

  FIG. 2 shows a control system of the ice making device described above. The main control unit 100 shown in FIG. 2 includes a compressor based on detection signals and operation signals from the ice detection sensor 31, the external temperature sensor (external temperature detection means) 35, the ice discharge switch 50, and data stored in the memory 110 in advance. 11, the operation of the chipper motor 21, the ice making refrigerant supply valve 17, the water tank refrigerant supply valve 47, the electronic expansion valve 13, the blower fan motor 18, and the gate actuator 33.

  For example, as shown in FIG. 1, the external temperature sensor 35 is disposed around the ice storage tank 30 in the casing of the vending machine (not shown), detects the external temperature of the ice storage tank 30, and detects the temperature. The result is output to the main control unit 100. The ice payout switch 50 is disposed on the front surface of the casing of the vending machine (not shown), and outputs an operation signal to the main control unit 100 when operated by a user. This ice payout switch 50 may be provided independently, or may be provided as a selection switch for selecting a drink containing ice. As shown in FIG. 1, the blower fan motor 18 drives a blower fan 19 that blows air to the condenser 12.

  As shown in FIG. 2, the main control unit 100 includes an operation mode determination unit 111, a start determination time setting unit 112, a drive signal output unit 113, a payout signal output unit 114, an end determination time setting unit 115, and a stop signal output unit 116. have.

  The operation mode determination unit 111 selects an ice making process to be performed according to the state of the ice making device. In the present embodiment, it is determined whether the ice making device is in a state immediately after the power is turned on or in a state immediately after the ice in the ice storage tank 30 is discharged, and a replenishment ice making process to be described later is performed or will be described later. Whether to perform delayed ice making is selected.

  The start determination time setting unit 112 sets the start determination time based on the external temperature detected by the external temperature sensor 35. The start determination time is a delay time for waiting until the ice making operation is actually started after the ice detection sensor 31 detects the non-upper limit state. In the present embodiment, the start determination time is set shorter as the detected external temperature is higher. For example, if the external temperature is 10 ° C., 20 ° C., 30 ° C., and 40 ° C., the start determination time is set to 60 minutes, 45 minutes, 30 minutes, and 20 minutes, respectively.

  The drive signal output unit 113 outputs a drive signal to each of the chipper motor 21, the compressor 11, the blower fan motor 18, the refrigerant supply valves 17 and 47, and the electronic expansion valve 13 at a timing according to the ice making process being performed. It is. The payout signal output unit 114 outputs a payout signal to the gate actuator 33 in accordance with an operation signal from the ice payout switch 50.

  The end determination time setting unit 115 sets the end determination time based on the external temperature detected by the external temperature sensor 35. The end determination time is a delay time for waiting until the ice making operation is actually stopped after the detection result of the ice detection sensor 31 is switched from the non-upper limit state to the upper limit state. The start determination time is set to be shorter as the external temperature is higher, but the end determination time is set to a predetermined constant value, for example, 45 seconds, regardless of the external temperature.

  The stop signal output unit 116 outputs a stop signal to each of the chipper motor 21, the compressor 11, the blower fan motor 18, the refrigerant supply valves 17 and 47, and the electronic expansion valve 13 at a timing according to the ice making process being performed. It is.

  Hereinafter, the control content performed by the main control unit 100 will be described with reference to the timing chart of FIG. 3 as appropriate. In a standby state before the power is turned on, all of the chipper motor 21, the compressor 11, and the blower fan motor 18 are stopped, and the ice-making refrigerant supply valve 17, the water tank refrigerant supply valve 47, and the electronic expansion valve 13 are Each is in a closed state. When ice is not stored in the ice storage tank 30, the main control unit 100 invalidates the ice payout switch 50 and determines that no operation signal is output even when operated by the user.

  First, in this ice making device, when the power is turned on, the main control unit 100 detects whether or not the ice stored in the ice storage tank 30 has reached the upper limit height through the ice detection sensor 31. When power is turned on, since ice is not stored in the ice storage tank 30, the ice detection sensor 31 detects the non-upper limit state.

  If the non-upper limit state of the ice storage tank 30 is detected by the ice detection sensor 31 immediately after the power is turned on, the replenishment ice making process is selected by the operation mode determination unit 111. In this replenishment ice making process, a drive signal is immediately output from the main control unit 100 to the chipper motor 21 through the drive signal output unit 113, and then the compressor 11, the ice making refrigerant supply valve 17, the blower fan motor 18, and the electronic expansion valve 13. The chipper motor 21 starts rotating, the compressor 11 and the blower fan motor 18 are driven, and the ice-making refrigerant supply valve 17 and the electronic expansion valve 13 are opened. It becomes a state. As a result, the refrigerant is supplied to the ice making refrigeration circuit 10 to start the generation of ice, and the ice storage tank 30 sequentially stores the ice.

  When the generation of ice proceeds and it is detected through the ice detection sensor 31 that the ice stored in the ice storage tank 30 is in the upper limit state, the main control unit 100 assumes that the end determination condition described in detail later is satisfied. Then, the compressor 11 and the blower fan motor 18 are stopped at an appropriate timing, and the replenishment ice making process is ended. Even when the chipper motor 21, the compressor 11, and the blower fan motor 18 are stopped, the ice making refrigerant supply valve 17 and the electronic expansion valve 13 are not immediately closed and post processing is performed. This post-processing will also be described in detail later.

  On the other hand, when the main control unit 100 detects that the ice stored in the ice storage tank 30 is in the upper limit state, the main control unit 100 activates the invalidated ice dispensing switch 50 and enters an ice dispensing standby state. As a result, ice can be provided to the user who operates the ice payout switch 50. That is, when the user operates the ice payout switch 50 in the ice payout standby state and an operation signal is output to the main control unit 100, an ice payout process is performed. In the ice payout process, the gate 34 is operated by driving the gate actuator 33, and the payout port 32a of the payout passage 32 is opened for a preset time. As a result, a certain amount of ice passes through the dispensing passage 32 and is provided to the user together with the beverage.

  When ice is paid out by operating the ice payout switch 50, the ice stored in the ice storage tank 30 decreases, so the ice detection sensor 31 detects the non-upper limit state, and the output of the detection signal stops. When the non-upper limit state of the ice storage tank 30 is detected by the ice detection sensor 31 immediately after the gate actuator 33 is driven, the replenishment ice making process is selected by the operation mode determination unit 111 and the replenishment ice making process is performed again by the main control unit 100. The As a result, until the ice detection sensor 31 detects the upper limit state, the chipper motor 21, the compressor 11, and the blower fan motor 18 are driven while the ice-making refrigerant supply valve 17 and the electronic expansion valve 13 are open, and the ice Is generated and the generated ice is stored in the ice storage tank 30. If an operation signal is output from the ice payout switch 50 during the replenishment ice making process, the ice payout process is immediately executed. During this time, the supplemental ice making process may be interrupted or executed in parallel with the ice paying process.

  Here, even if the ice payout switch 50 is not operated in the ice payout standby state, the ice is melted by the influence of heat entering from the outside of the ice storage tank 30, so the ice detection sensor 31 detects the non-upper limit state. There is a case. Thus, when the non-upper limit state of the ice storage tank 30 is detected by the ice detection sensor 31 at a timing that does not correspond to either immediately after the power is turned on or immediately after the gate actuator 33 is driven, the operation mode determination unit 111 performs the delayed ice making process. Selected.

  In this delayed ice making process, the main control unit 100 first detects the external temperature of the ice storage tank 30 through the external temperature sensor 35, and calculates and sets the start determination time through the start determination time setting unit 112 based on the detected external temperature. Do.

  The main control unit 100 that has set the start determination time compares the duration of the non-upper limit state with the start determination time through the drive signal output unit 113. When the duration of the non-upper limit state detected at time t1 in FIG. 3A reaches the start determination time (time t2 in FIG. 3A), the main control unit 100 sends the chipper motor through the drive signal output unit 113. 21 immediately outputs a drive signal (time t2 in FIG. 3B), and then outputs a drive signal to the compressor 11, the ice making refrigerant supply valve 17, the blower fan motor 18, and the electronic expansion valve 13. (FIG. 3 (c), FIG. 3 (d), FIG. 3 (f), time t3 in FIG. 3 (g)).

  Thus, after the chipper motor 21 starts rotating, the compressor 11 and the blower fan motor 18 are driven, and the ice-making refrigerant supply valve 17 and the electronic expansion valve 13 are opened. As a result, the refrigerant is supplied to the ice making refrigeration circuit 10 to start the generation of ice, and the ice storage tank 30 sequentially stores the ice. If the duration of the non-upper limit state does not reach the start determination time, the main control unit 100 does not output an output signal. Therefore, the delayed ice making process is not performed.

  When the generation of ice proceeds and it is detected through the ice detection sensor 31 that the ice stored in the ice storage tank 30 is in the upper limit state, the main controller 100 performs an end determination process. In the end determination process, the continuation time of the above-described upper limit state is compared with the end determination time set by the end determination time setting unit 115 through the stop signal output unit 116.

  When the duration time of the upper limit state detected at time t4 in FIG. 3A reaches the end determination time (time t5 in FIG. 3A), the main control unit 100 performs post-processing. In this post-processing, the main control unit 100 immediately outputs a stop signal to the chipper motor 21, the compressor 11, and the blower fan motor 18 through the stop signal output unit 116 (FIG. 3B, FIG. 3C, FIG. 3 (f) at time t5), at the same time, a drive signal is output to the aquarium coolant supply valve 47 through the drive signal output unit 113 (time t5 in FIG. 3 (e)). Next, the main control unit 100 outputs a stop signal to the electronic expansion valve 13 through the stop signal output unit 116 (time t6 in FIG. 3G), and after the preset stop from the time when the compressor 11 was finally stopped. When the opening time elapses, a stop signal is output to the ice making refrigerant supply valve 17 and the water tank refrigerant supply valve 47 (time t7 in FIGS. 3D and 3E).

  Thus, the chipper motor 21, the compressor 11 and the blower fan motor 18 are stopped in a state where the ice making refrigerant supply valve 17, the water tank refrigerant supply valve 47 and the electronic expansion valve 13 are opened, and ice generation is stopped. Thereafter, the electronic expansion valve 13 and the refrigerant supply valves 17, 47 are sequentially closed, and the ice making device returns to the ice discharge standby state again. In the present embodiment, the refrigerant supply valves 17 and 47 are closed after 10 minutes have elapsed since the compressor 11 was stopped.

  Thereafter, the delayed ice making process or the replenishing ice making process is sequentially performed according to the above-described conditions.

  Here, according to the ice making device described above, when the ice detection sensor 31 detects that the ice storage tank 30 is in the non-upper limit state, the ice making operation is performed after the preset start determination time has elapsed. Yes. Therefore, even if the upper limit height of ice and the decrease in the ice storage amount are detected by one ice detection sensor 31, there is no risk of chattering in the ice detection sensor 31, and the compressor 11 is driven in a short time. Since the situation where the stop is repeated is not caused, it is possible to contribute to energy saving while suppressing the manufacturing cost.

  Moreover, since the start determination time is set to be shorter as the external temperature is higher, the intrusion heat into the ice storage tank 30 increases in the summer, and the decrease rate of the ice storage amount and the demand for ice as a beverage increase. There is no risk of hindering the provision of iced beverages. On the other hand, in winter, when the external temperature is low and the demand for ice as a beverage has decreased due to low external temperature, ice generation will occur after waiting for a longer start determination time, thus saving energy. Will be able to contribute greatly to

  In the above-described embodiment, the ice making device mounted on the cup type vending machine is illustrated, but it is not necessarily required to be mounted on the vending machine. The end determination time set by the end determination time setting unit 115 is set to a constant value regardless of the external temperature. For example, the end determination time may be set longer as the external temperature is higher. Absent.

  Further, in the above-described embodiment, the compressor 11 is stopped with the ice making refrigerant supply valve 17, the water tank refrigerant supply valve 47, and the electronic expansion valve 13 open, so that no refrigerant is supplied. Thus, it is possible to reliably prevent the compressor 11 from being driven. However, the present invention is not limited to this.

  Further, in the above-described embodiment, the start determination time setting unit 112 calculates and sets the start determination time each time. However, the start determination time set in advance by the start determination time setting unit 112 is set to the external temperature. The data may be stored in the memory 110 in association with each other, and the external temperature may be read as a key.

  Furthermore, in the above-described embodiment, the water tank refrigeration circuit 40 is attached to the ice making refrigeration circuit 10, but the water tank refrigeration circuit 40 is not necessarily provided.

  In the above-described embodiment, when the duration of the non-upper limit state reaches the start determination time, the drive signal is output to the chipper motor 21 and then the drive signal is output to the compressor 11. The drive signal may be output to the compressor 11 as long as the non-upper-limit state duration reaches the start determination time. For example, the compressor is immediately output when the non-upper-limit state duration reaches the start determination time. 11 may output a drive signal.

DESCRIPTION OF SYMBOLS 10 Refrigeration circuit for ice making 11 Compressor 12 Condenser 13 Electronic expansion valve 14 Evaporator for ice making 15 Circulation supply passage 17 Refrigerant supply valve for ice making 20 Ice making part 30 Ice storage tank 31 Ice detection sensor 32 Discharge passage 32a Discharge outlet 33 Gate actuator 34 Gate 35 External temperature sensor 50 Ice discharge switch 100 Main control unit 112 Start determination time setting unit 113 Drive signal output unit 114 Discharge signal output unit 115 End determination time setting unit 116 Stop signal output unit

Claims (4)

When a drive signal is given, the compressor is driven, and the refrigerant is circulated between the condenser, the expander, and the ice making evaporator, thereby generating ice in the ice making unit incorporating the ice making evaporator. An ice making refrigeration circuit;
An ice storage unit for sequentially storing ice generated in the ice making unit;
Ice detecting means for detecting when the amount of ice stored in the ice storage unit reaches a preset upper limit height;
An external temperature detecting means for detecting an ambient external temperature of the ice storage unit;
An ice making device comprising: control means for controlling drive of the compressor based on a detection result of the ice detection means and a detection result of the external temperature detection means,
The control means includes
A start determination time setting unit that sets a start determination time according to the detection result of the external temperature detection means;
When it is detected by the ice detection means that the amount of ice stored in the ice storage unit has fallen below the upper limit height, the non-upper limit state below the upper limit height is continued for the start determination time set by the start determination time setting unit. A drive signal output unit that outputs a drive signal to the compressor when the duration of the non-upper limit state reaches the start determination time, and the start determination time setting unit The ice making device is characterized in that the start determination time is set shorter as the detected temperature of the external temperature detecting means is higher. The ice storage unit is configured to pay out a predetermined amount of ice to the outside whenever a payout signal is given,
When the non-upper limit state is detected by the ice detection unit after the ice is discharged from the ice storage unit according to the payout signal, the drive signal output unit does not wait for the start determination time to pass to the compressor. The ice making device according to claim 1, wherein: The control means includes
An end determination time setting unit for setting an end duration according to the detection result of the external temperature detection means;
After outputting a drive signal to the compressor through the drive signal output unit, when the ice detection means detects that the ice storage amount of the ice storage unit has reached the upper limit height, the upper limit reached state that has reached this upper limit Monitoring whether the end determination time set by the end determination time setting unit continues or not, and outputting a stop signal to the compressor when the duration of the upper limit reaching state reaches the end determination time The ice making device according to claim 1, further comprising: a signal output unit. The ice making refrigeration circuit includes an ice making refrigerant supply valve in a refrigerant supply passage from the expander to the ice making evaporator,
The control means opens the ice-making refrigerant supply valve simultaneously with the driving of the compressor to enable circulation of the refrigerant, while outputting a stop signal to the compressor through the stop signal output unit, 2. The ice making device according to claim 1, further comprising a refrigerant supply control unit configured to maintain the ice making refrigerant supply valve continuously opened for a preset opening time after the stop. 3.

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