JP2017110844A - Ice making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a proper water level in a tank irrespective of a water pressure of water supply to a tank, after resumption of the drive of a circulation pump.SOLUTION: A control device 20 of an ice making machine 100 starts an ice making operation by driving a circulation pump 15 for drive time T1 after starting water supply to a tank 12 by bringing a water supply valve 11 into an open state. In the case where a water temperature of ice making water is equal to or below a preset temperature TH at the time point t3 where the drive time T1 has elapsed, driving of the circulation pump 15 is stopped for stop time ST, and from a start time point t2 of the drive time T1 until the elapse of time T2 after drive stop of the circulation pump 15, the water supply valve 11 is maintained to be in an open state, and the water supply to the tank 12 is continued.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an ice making machine.

  Conventionally, an ice making machine that prevents the generation of cotton ice is known (see, for example, Patent Document 1).

  In the ice making machine of Patent Document 1, when normal temperature water is supplied to the tank and the temperature of the ice making water is lowered to a set temperature near 0 ° C. higher than 0 ° C. due to the start of the ice making operation, the circulation pump is driven. By stopping at the set time and supplying normal temperature water to the tank for the set time to maintain the temperature of the ice making water at a temperature higher than 0 ° C., the generation of cotton ice is prevented.

  Further, in Patent Document 1, the driving of the circulation pump is stopped for a set time, the temperature of the ice making chamber is lowered, and when the driving of the circulation pump is restarted, ice is generated in a part of the ice making chamber, It is described that generation can be prevented.

Japanese Patent No. 5052201

  However, in the ice making machine of Patent Document 1, since the water supply to the tank is stopped before the driving of the circulation pump is stopped, the water level in the tank is lowered, and after the driving of the circulation pump is resumed, an appropriate water level is set in the tank. There is a possibility that it cannot be secured. Further, in the ice making machine of Patent Document 1, since the ice making water in the circulation path flows into the tank by stopping the driving of the circulation pump, there is a possibility that an appropriate water level cannot be secured in the tank after the driving of the circulation pump is resumed. is there.

  If an appropriate water level cannot be ensured in this manner, air biting occurs in the circulation pump, and the air is mixed with ice-making water supplied to the ice-making chamber, thereby producing cloudy ice (cavity ice).

  The object of the present invention is to provide a good quality ice by ensuring an appropriate water level in the tank regardless of the water pressure of the water supplied to the tank after the circulation pump is restarted after the operation for preventing the occurrence of cotton ice is completed. It is.

  An ice making machine according to one aspect of the present invention cools ice making water in a tank that stores ice making water supplied from a water supply valve, a circulation pump that supplies ice making water in the tank to an ice making chamber, and the ice making water in the ice making chamber. An ice making machine comprising: a cooling circuit that freezes the water; a water temperature sensor that detects a water temperature of the ice making water in the tank; and a control unit that controls opening and closing of the water supply valve and driving of the circulation pump, The control unit opens the water supply valve and starts water supply to the tank, and then drives the circulation pump for a preset drive time to execute an ice making operation, and when the drive time has elapsed, When the water temperature detected by the water temperature sensor is equal to or lower than a preset temperature higher than 0 degrees, the circulation pump is stopped during a preset stop time, and from the start time of the drive time. The circulation pump Until a predetermined time after the stopping of the driving of the passes, while maintaining the water supply valve to the open state to continue the supply of water to the tank.

  According to the present invention, an appropriate water level in the tank can be secured and high-quality ice can be provided regardless of the water pressure of the water supplied to the tank after the driving of the circulation pump is resumed.

The partial notch perspective view which shows the structural example of the ice making machine which concerns on embodiment of this invention The side view which shows the ice making unit when the water tray which concerns on embodiment of this invention exists in a closed position The side view which shows the ice making unit when the water tray which concerns on embodiment of this invention exists in an open position The graph which shows the relationship between the flow volume of ice-making water and water pressure which concerns on embodiment of this invention The block diagram which shows the structural example of the control apparatus which concerns on embodiment of this invention, and its periphery The time chart which shows the operation example 1 of the water supply valve and circulation pump which concern on embodiment of this invention The time chart which shows the operation example 2 of the feed valve and circulation pump which concerns on embodiment of this invention The time chart which shows the operation example 3 of the water supply valve and circulation pump which concern on embodiment of this invention The time chart which shows the modification of the operation example 3 which concerns on embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a configuration example of the ice making machine 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a partially cutaway perspective view showing a configuration example of the ice making machine 100.

  An ice making machine 100 shown in FIG. 1 is a reverse cell type ice making machine including a so-called reverse cell type ice making unit (hereinafter simply referred to as “ice making unit”) 10.

  As shown in FIG. 1, the ice making machine 100 includes a box-shaped housing 1 having heat insulation properties, and an ice making unit 10 built in an upper portion of the housing 1. Inside the housing 1, an ice storage 2 having an opening is formed below the ice making unit 10. The ice storage 2 stores the ice produced by the ice making unit 10. A heat insulating door 3 pivotally supported forward is attached to the front opening of the ice storage 2 so as to be freely opened and closed.

  As shown in FIG. 1, inside the housing 1, below the ice storage 2, an electrical box 4 in which a control device 20 (see FIG. 5) described later is accommodated, and a condenser 5 that condenses and liquefies the refrigerant. , A condenser blower 6 for blowing air to the condenser 5, a condenser outlet pipe 7 for sending the condensed and liquefied refrigerant from the condenser 5 to a decompression means (not shown) such as an expansion valve, and a high-temperature refrigerant (both hot gas) A hot gas valve 8 interposed in a hot gas pipe (not shown) that directly flows into the cooling circuit 18, a compressor 5 that discharges refrigerant to the hot gas valve 8, and the like.

  Next, the ice making unit 10 will be described with reference to FIGS. FIG. 2 is a side view showing the ice making unit 10 when the water tray 16 is in the closed position. FIG. 3 is a side view showing the ice making unit 10 when the water tray 16 is in the open position.

  As shown in FIGS. 2 and 3, the ice making unit 10 includes a water supply valve 11, a tank 12, a water level sensor 13, a water temperature sensor 14, a circulation pump 15, a water tray 16, and a cooler 23 (ice making chamber 17, cooling circuit 18). And a motor 19. Here, the cooler 23 has an ice making chamber 17 in which a large number of ice making chambers (not shown) opened downward are defined in a grid-like cell (private chamber), and a cooling circuit is provided on the upper wall of the cooler 23. 18 is closely arranged in a meandering manner. Here, the cooling circuit 18 may be formed by a meandering cooling pipe, or a plate having a meandering flow path through which the refrigerant passes may be closely attached to the upper wall of the cooler 23 to form a heat exchanger. .

  The water supply valve 11 is connected to a water pipe and supplies tap water as ice making water to the tank 12. The water supply valve 11 is provided with a flow rate regulator (not shown) that adjusts the flow rate of the ice making water from the water supply valve 11.

  Here, an example of the flow rate adjustment by the flow rate regulator will be described with reference to FIG. FIG. 4 is a graph showing the relationship between the flow rate of ice-making water supplied from the water supply valve 11 and water pressure (also referred to as water supply pressure). As shown in L1 of FIG. 4, when the flow rate is not adjusted, the water pressure and the flow rate are in a proportional relationship, but in this embodiment, as shown in L2 of FIG. Limit to. Thereby, even if the water pressure rises, the flow rate is kept constant. In the present embodiment, the water pressure when the flow rate is maintained at the upper limit value u is “standard water pressure”, and the water pressure when the flow rate is less than the upper limit value u is “low water pressure”. In addition, the range of the standard water pressure is, for example, 0.05 MPa to 0.6 MPa.

  The tank 12 stores ice making water supplied from the water supply valve 11 and ice making water that has not been frozen in the ice making chamber 17.

  Inside the tank 12, a water level sensor 13 for detecting an appropriate water level (also called a full water level) set in advance for ice making water is installed. The appropriate water level is determined when there is a predetermined amount of ice making water in each of the tank 12 and the ice making water circulation path (for example, the path from the circulation pump 15 to the ice making chamber 17) while the circulation pump 15 is being driven. The water level detected by the sensor 13 is a water level that can prevent air biting. The water level sensor 13 is, for example, a float type water level switch, but may be of other types.

  In addition, a water temperature sensor 14 for detecting the temperature of the ice making water stored in the tank 12 is installed inside the tank 12.

  A water tray 16 is integrally formed on the upper portion of the tank 12. The water tray 16 has an injection hole (not shown) that passes when ice making water in the tank 12 flows into the ice making chamber 17, and ice making water that has not been frozen in the ice making chamber 17 flows into the tank 12 from the ice making chamber 17. And a return hole (not shown) that passes when the operation is performed.

  The circulation pump 15 sucks up ice making water in the tank 12. Thereby, the ice making water in the tank 12 flows into the ice making chamber 17 from the injection hole through the suction port, the water conduit, and the distribution pipe (all not shown) in the tank 12.

  The ice making chamber 17 is opened downward, and the ice making water in the tank 12 is supplied as described above. Although not shown in FIGS. 2 and 3, the ice making chamber 17 is composed of a plurality of cells (private chambers). In addition, the injection hole mentioned above is provided corresponding to each cell.

  A cooling circuit 18 is disposed above the ice making chamber 17 (cooler 23). The refrigerant discharged from the compressor 9 is condensed and liquefied by the condenser 5, decompressed by an expansion valve (not shown), and then sent to the cooling circuit 18 to cool the cells of the ice making chamber provided in the ice making chamber. Thereby, the ice making water supplied to the ice making chamber 17 is cooled, and ice (ice block) is gradually generated. At this time, the ice-making water that has not reached freezing flows downward and is collected in the tank 12 through the return hole.

  The motor 19 (an example of a drive unit) is a high-speed gear ratio motor that can rotate forward and reverse. By the forward rotation of the motor 19, the water pan 16 in the closed position shown in FIG. 2 rotates in the direction of arrow a in FIG. 2 (clockwise) and tilts to the open position shown in FIG. The closed position is a position where the water tray 16 closes the lower side of the ice making chamber 17, and the open position is a position where the water tray 16 opens the lower side of the ice making chamber 17. On the other hand, due to the reverse rotation of the motor 19, the water pan 16 in the open position shown in FIG. 3 rotates in the direction of the arrow b in FIG. 3 (counterclockwise) and returns to the closed position shown in FIG. .

  Next, the control apparatus 20 (an example of a control part) accommodated in the electrical equipment box 4 is demonstrated using FIG. FIG. 5 is a block diagram showing the configuration of the control device 20 and its periphery.

  The control device 20 is a general-purpose microcomputer that controls the entire operation of the ice making machine 100. The control device 20 includes a timer 21 that measures a predetermined time.

  A water level sensor 13, a water temperature sensor 14, and an outside air temperature sensor 22 are connected to the input side of the control device 20. The outside air temperature sensor 22 is, for example, a CT sensor that is provided at a predetermined location of the condenser outlet pipe 7 and detects the outlet temperature of the refrigerant. The reason why the CT sensor can be used is that the temperature of the refrigerant at the outlet of the condenser 5 reflects the outside air temperature around the ice making machine 100.

  On the other hand, a motor 19, a water supply valve 11, and a circulation pump 15 are connected to the output side of the control device 20.

  The control device 20 controls the operation of the motor 19, the water supply valve 11, and the circulation pump 15 based on the detection results received from the water level sensor 13, the water temperature sensor 14, and the outside air temperature sensor 22 and the time measured by the timer 21. . The operation of each component by this control will be described later with reference to FIGS.

  Although not shown, a condenser blower 6, a hot gas valve 8, a compressor 9, and the like are also connected to the output side of the control device 20, and these are controlled by the control device 20. Since this control is a known technique, a description thereof is omitted here.

  The configuration example of the ice making machine 100 has been described above. In the above description, only the main configuration of the ice making machine 100 has been described. However, the ice making machine 100 is provided with components other than those shown in FIGS. 1 to 3 (generally provided in a reverse cell type ice making machine). Component).

  Next, operation examples 1 to 3 of the water supply valve 11 and the circulation pump 15 will be described with reference to FIGS. 6 to 8 show a case where the ice making operation is performed after the deicing operation as an example, the deicing operation and the ice making operation are alternately performed. Hereinafter, the ice making operation and the deicing operation performed under the control of the control device 20 will be described.

  First, the ice making operation will be described.

  When the ice making operation is performed, as shown in FIG. 2, the water tray 16 is held in a closed position where the lower part of the ice making chamber 17 is closed. In the ice making operation, the hot gas valve 8 is closed, the refrigerant discharged from the compressor 9 is circulated and supplied to the cooling pipe 18 through the condenser 5 and the expansion valve, and the ice making chamber 17 is forcibly cooled. The ice making water in the tank 12 is sucked up by the circulation pump 15 and supplied to each cell of the ice making chamber 17 through the water guide pipe, the distribution pipe and the injection hole of the water tray 16. The ice making water that has flowed into each cell of the ice making chamber 17 comes into contact with the inner surface of the cell and is cooled, then flows down from the return hole of the water tray 16 and returns to the tank 12. When the temperature of the ice making water reaches 0 ° C. in each cell of the ice making chamber 17, a part of the ice making water starts to freeze on the inner wall of each cell of the ice making chamber 17. Then, freezing in each cell of the ice making chamber 17 proceeds gradually, and finally a solid ice mass is generated. After the ice block is generated in this way, the control device 20 switches from the ice making operation to the deicing operation.

  Next, the deicing operation will be described.

  In the deicing operation, the hot gas valve 8 is opened, the hot gas discharged from the compressor 9 is supplied to the cooling circuit 18 through the hot gas pipe, and the ice making chamber 17 is heated. As a result, ice blocks fall from each cell of the ice making chamber 17 to the water tray 16. Further, the circulation pump 15 and the condenser blower 6 are stopped. Further, the motor 19 rotates forward, and the water tray 16 tilts from the closed position shown in FIG. 2 toward the open position shown in FIG. When the water pan 16 reaches the open position, the forward rotation of the motor 19 is stopped and the water tray 16 is held at the open position. Thereby, the ice block on the water tray 16 falls to the ice storage 2. Thereafter, the motor 19 rotates in the reverse direction, and the water tray 16 moves backward from the open position shown in FIG. 3 toward the closed position shown in FIG. When the water tray 16 reaches the closed position, the reverse rotation of the motor 19 is stopped and the water tray 16 is held in the closed position.

<Operation example 1>
Operation example 1 of the water supply valve 11 and the circulation pump 15 will be described with reference to FIG. FIG. 6 is a time chart showing an operation example 1 of the water supply valve 11 and the circulation pump 15.

  First, an operation example of the water supply valve 11 and the circulation pump 15 during the deicing operation will be described.

  During the deicing operation, the control device 20 stops driving the circulation pump 15.

  Further, the control device 20 tilts the water pan 16 from the closed position to the open position, and controls the water supply valve 11 to be in the open state during the time T0 of the period held in the open position, and the time T0 has elapsed. When this happens, the water supply valve 11 is controlled to be closed. The time T0 is measured by the timer 21. When the water supply valve 11 is opened, ice-making water is supplied from the water supply valve 11 to the tank 12. At this time, the supplied ice making water is also supplied to the surface of the water tray 16 where the ice block is dropped, and the ice adhering to the surface is washed away. Moreover, the water temperature in the tank 12 rises at time T0.

  Next, the control device 20 controls the water supply valve 11 to be in an open state at a time point t1 in a period in which the water tray 16 moves backward from the open position to the closed position. Thereby, ice-making water is supplied to the tank 12, and the water temperature in the tank 12 rises as shown in FIG. The supply of ice making water to the tank 12 started at time t1 is continued until time t4 during ice making operation described later. That is, the control device 20 controls the water supply valve 11 to be in an open state at time t1 and to be in a closed state at time t4.

  Next, an operation example of the water supply valve 11 and the circulation pump 15 during the ice making operation will be described.

  First, the control device 20 starts to drive the circulation pump 15 when an appropriate water level is detected by the water level sensor 13 at time t2. And the control apparatus 20 continues the drive of the circulation pump 15 during drive time T1. The driving time T1 is measured by the timer 21. By the driving of the circulation pump 15, ice making water is jetted into each cell of the ice making chamber 17 during the driving time T <b> 1. Further, during the driving time T1, in the tank 12, the ice making water supplied from the water supply valve 11 and the ice making water returned to the tank 12 from each cell of the ice making chamber 17 are mixed.

  Next, the control device 20 determines whether or not the water temperature in the tank 12 detected by the water temperature sensor 14 is equal to or lower than a preset set temperature TH at the time t3 when the drive time T1 has elapsed. The set temperature TH is, for example, a temperature higher than 0 degrees and in the vicinity of 0 degrees (for example, 3 degrees).

  As a result of the determination, when the water temperature in the tank 12 is equal to or lower than the set temperature TH, the control device 20 executes the cotton ice prevention operation. Hereinafter, the cotton ice prevention operation will be described.

  The control device 20 stops driving the circulation pump at time t3 and stops driving the circulation pump 15 until the stop time ST elapses from time t3. The stop time ST is measured by the timer 21. This stop time ST is variably set according to the outside air temperature detected by the outside air temperature sensor 22, for example. For example, the higher the outside air temperature is, the longer the stop time ST is set, and the lower the outside air temperature is, the shorter the stop time ST is variably set. During the stop time ST, the ice making chamber 17 is cooled and ice nuclei are formed in each cell.

  In addition, the control device 20 closes the water supply valve 11 that has been opened from time t1 at time t4 when time T2 has elapsed. Thereby, supply of the ice making water to the tank 12 is stopped.

  In this way, in this operation example, water supply is continued for a period from the start time t2 of the drive time T1 to the time t4 when the time T2 after the circulation pump drive is stopped (hereinafter referred to as T1 + T2). . T1 + T2 is set based on the results of experiments, simulations, and the like performed in advance so that the ice-making water in the tank 12 reaches an appropriate water level by supplying water to the tank 12 when the supply water pressure is the standard water pressure.

  The cotton ice prevention operation has been described above.

  The control device 20 resumes driving of the circulation pump 15 at time t5 when the stop time ST has elapsed. Further, the control device 20 determines whether or not to supply water after restarting the driving of the circulation pump 15 depending on whether or not the water level sensor 13 has detected an appropriate water level at the time t5. When the water supply pressure is the standard water pressure, the appropriate water level is detected at time t5, and the control device 20 determines that the water supply is not performed after the circulation pump 15 is restarted. As a result, as shown in FIG. 6, after the time t5, the water supply valve 11 is maintained in the closed state, and water supply to the tank 12 is not performed. On the other hand, when the water supply pressure is a low water pressure, the appropriate water level is not detected at time t5, and the control device 20 determines that the water supply is performed after the circulation pump 15 is restarted. Control based on this determination result will be described later with reference to FIG.

  As described above, according to this operation example, the water supply to the tank 12 is continued for T1 + T2, so that when the water supply pressure is the standard water pressure, an appropriate water level can be secured in the tank 12. As a result, it is possible to prevent the occurrence of air biting after restarting the driving of the circulation pump 15 and to prevent the formation of cloudy ice (cavity ice).

  Further, according to this operation example, when the water temperature of the ice making water in the tank 12 is equal to or lower than the set temperature TH at the time t3 when the driving time T1 has elapsed, the driving of the circulation pump 15 is stopped and the circulation pump 15 Since the water is supplied to the tank 12 during the time T2 after the drive is stopped, the water temperature in the tank 12 can be prevented from lowering, and the generation of cotton ice can be prevented.

<Operation example 2>
An operation example 2 of the water supply valve 11 and the circulation pump 15 will be described with reference to FIG. FIG. 7 is a time chart showing an operation example 2 of the water supply valve 11 and the circulation pump 15. FIG. 7 is different from FIG. 6 in the operation after resumption of driving of the circulation pump 15 during the ice making operation. Hereinafter, only differences from FIG. 7 will be described.

  As described in the first operation example, the control device 20 determines whether or not to supply water after the driving of the circulation pump 15 is resumed, depending on whether or not the water level sensor 13 has detected an appropriate water level at time t5. In this operation example, it is assumed that the water supply pressure is low, the appropriate water level is not detected at time t5, and the control device 20 determines that the water supply is performed after the circulation pump 15 is restarted.

  Then, as shown in FIG. 7, the control device 20 supplies water to the tank 12 by opening the water supply valve 11 for a time T <b> 3 after the driving of the circulation pump 15 is resumed. The time T3 is a time set in advance according to the predicted water supply pressure so that the ice making water in the tank 12 becomes an appropriate water level. The time T3 is measured by the timer 21. The water supply valve 11 may be closed when the water level sensor 13 detects an appropriate water level without using the timer 21.

  As described above, according to this operation example, water is supplied for the time T3 after the driving of the circulation pump 15 is resumed. Therefore, when the water supply pressure is low, an appropriate water level can be secured in the tank 12. . As a result, it is possible to prevent the occurrence of air biting after restarting the driving of the circulation pump 15 and to prevent the formation of cloudy ice (cavity ice).

  In this operation example, since the circulation pump is driven during the time T3 when water is supplied, the water temperature in the tank 12 does not rise excessively. Therefore, after the driving of the circulation pump 15 is resumed, an increase in the water temperature can be suppressed, and the time for recooling to the ice making start temperature can be shortened. On the other hand, in the ice making machine of Patent Document 1, normal temperature water is supplied to the tank while the circulation pump is stopped to maintain the temperature of the ice making water at a temperature higher than 0 ° C. Energy is required to lower the temperature, and it takes time to re-cool to the ice making start temperature.

  In general, when a water level sensor is not used, the proper water level in the tank is maintained by providing a member or the like that allows ice-making water above the appropriate water level to overflow to the outside of the tank. On the other hand, in the present embodiment, the appropriate water level is detected using the water level sensor and the appropriate water level in the tank is maintained, so that it is not necessary to throw away the ice making water out of the tank. Therefore, ice making water can be saved.

<Operation example 3>
The operation example 3 of the water supply valve 11 and the circulation pump 15 will be described with reference to FIG. FIG. 8 is a time chart showing an operation example 3 of the water supply valve 11 and the circulation pump 15. FIG. 8 differs from FIG. 7 in the operation after the drive time T1 has elapsed during the ice making operation. Hereinafter, only differences from FIG. 7 will be described.

  During the ice making operation, the control device 20 determines whether or not the water temperature in the tank 12 detected by the water temperature sensor 14 is equal to or lower than a preset temperature TH at the time t3 when the driving time T1 has elapsed.

  As a result of the determination, as shown in FIG. 8, when the water temperature in the tank 12 at the time point t3 is not equal to or lower than the set temperature TH, the control device 20 continues to drive the circulation pump 15 after the time point t3.

  Then, the control device 20 determines whether or not the water temperature detected by the water temperature sensor 14 is equal to or lower than the set temperature TH while the circulation pump 15 is continuously driven.

  As a result of the determination, when the water temperature in the tank 12 becomes equal to or lower than the set temperature TH at a predetermined time point (for example, time point t6) during which the circulation pump 15 is continuously driven, the control device 20 stops driving the circulation pump 15. In addition, the control device 20 closes the water supply valve 11 that has been opened from time t1 at time t6. Thereby, supply of the ice making water to the tank 12 is stopped.

  Since the operation after the elapse of the stop time ST is the same as that of the operation example 2, the description thereof is omitted here.

  As described above, according to the present operation example, even when the drive of the circulation pump 15 is continued after the time point t3 when the drive time T1 has elapsed, the operational effects described in the operation example 2 can be obtained.

  In this operation example, for example, as shown in FIG. 9, when the water level sensor 13 detects the appropriate water level at the time t7 when the circulation pump 15 continues to be driven after the time t3, the control device 20 opens the water supply valve 11. Close the water supply to stop it. In this case, since the appropriate water level is secured, the water supply valve 11 is maintained in the closed state after time t7.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. Hereinafter, modified examples will be described.

(Modification 1)
For example, in the embodiment, the case where the ice making machine 100 is a reverse cell type ice making machine has been described as an example. However, the present invention is not limited thereto, and other ice making machines may be used.

(Modification 2)
For example, in the embodiment, the water level sensor 13 is used to detect the appropriate water level, but the appropriate water level may be detected without using the water level sensor 13. For example, the control device 20 calculates the appropriate water level based on the amount of ice-making water supplied from the water supply valve 11 per predetermined time, the time during which the water supply valve 11 is open, and the capacity of the tank 12. Also good.

  The present invention is useful for an ice making machine.

DESCRIPTION OF SYMBOLS 1 Case 2 Ice storage 3 Heat insulation door 4 Electrical box 5 Condenser 6 Condenser 6 Condenser blower 7 Condenser outlet pipe 8 Hot gas valve 9 Compressor 10 Reverse cell type ice making unit 11 Water supply valve 12 Tank 13 Water level sensor 14 Water temperature sensor 15 Circulation pump 16 Water pan 17 Ice making chamber 18 Cooling circuit 19 Motor 20 Control device 21 Timer 22 Outside air temperature sensor 23 Cooler 100 Ice making machine

Claims (7)

A tank that stores ice-making water supplied from a water supply valve, a circulation pump that supplies ice-making water in the tank to an ice-making chamber, a cooling circuit that cools and freezes ice-making water in the ice-making chamber, An ice making machine comprising: a water temperature sensor that detects a water temperature of ice making water; and a control unit that controls opening and closing of the water supply valve and driving of the circulation pump,
The controller is
After the water supply valve is opened and water supply to the tank is started, the ice making operation is performed by driving the circulation pump for a preset drive time,
If the water temperature detected by the water temperature sensor when the drive time has elapsed is equal to or lower than a preset set temperature higher than 0 degrees, the drive of the circulation pump is stopped for a preset stop time; and The water supply valve is maintained in an open state until the predetermined time after the drive stop of the circulation pump elapses from the start time of the drive time, and water supply to the tank is continued.
Ice machine. A water level sensor for detecting an appropriate water level of the ice making water in the tank set in advance;
The controller is
If the appropriate water level is not detected by the water level sensor when the stop time has elapsed, the water supply valve is opened to supply water to the tank for a predetermined time after resumption of driving of the circulation pump.
The ice making machine according to claim 1. A water level sensor for detecting an appropriate water level of the ice making water in the tank set in advance;
The controller is
When the water temperature detected by the water temperature sensor when the drive time has elapsed is higher than the set temperature, the driving of the circulation pump is continued.
When the water temperature detected by the water temperature sensor during the continuous driving of the circulation pump becomes equal to or lower than the set temperature, the circulation pump is stopped during the stop time and the water supply valve is closed. To stop water supply to the tank,
If the appropriate water level is not detected by the water level sensor when the stop time has elapsed, the water supply valve is opened to supply water to the tank for a predetermined time after resumption of driving of the circulation pump.
The ice making machine according to claim 1. The controller is
When the appropriate water level is detected by the water level sensor while the circulation pump is continuously driven, the water supply valve is closed to stop water supply to the tank,
During the stoppage of the circulation pump drive and after the restart of the circulation pump drive, the water supply valve is maintained in a closed state and the supply of water to the tank is stopped.
The ice making machine according to claim 3. The appropriate water level is a water level detected by the water level sensor when a predetermined amount of ice making water is present in each of the circulation path of the tank and the ice making water during the operation of the circulation pump,
The time from the start of the driving time to the elapse of a predetermined time after the circulation pump is stopped is a time set in advance so that the ice-making water in the tank reaches the appropriate water level by supplying water to the tank. Is,
The ice making machine according to any one of claims 1 to 4. The stop time is variably set according to the outside temperature.
The ice making machine according to any one of claims 1 to 5. The tank has a water pan that tilts after receiving ice falling from the ice making chamber after completion of ice making,
The controller is
The water supply valve is opened, and water is supplied to the surface of the inclined water dish that receives the ice.
The ice making machine according to any one of claims 1 to 6.

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