JP2019086250A - Ice removal control method of ice making machine - Google Patents

Abstract

To solve the inconvenience of an ice making machine for producing ice by repeating an ice making step and an ice removing step in which, even when after forming ice in an ice making part in the ice making step, the ice frozen in the ice making part is supposed to be dropped by shifting to the ice removing step, in the ice removing step, the ice does not become an intended size due to various causes such as the tilting of the ice making part, excessive humidity in a space and the like, and the ice does not completely drop from the ice making part but stays partially at the lower part and is clogged, so that, when shifting to the ice making step in this state, the ice dropped in the next ice removing step is overlapped with the previously accumulated ice and multiple ice making occurs.SOLUTION: In an ice removing step, based on the temperature of a refrigerant detected by a refrigerant temperature sensor Th1 provided at an outlet of an evaporator, the prospect determination is performed as to whether it is a case where the ice has completely dropped from an ice making part, a case where the ice has dropped but may be clogged or a case where the ice is completely clogged, and control is performed for shifting to the ice making step, for performing additional ice removal and for performing the ice removal step once again.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a deicing control method of an ice making machine, and in the final stage of the deicing process, when ice is not completely dropped out of the ice making section and clogged due to any cause, it is directly used in the next ice making process. The present invention relates to a deicing control method capable of preventing harmful effects that cause transition to multiple ice making.

  Ice making machines that automatically produce large amounts of ice are widely used in various facilities such as restaurants and coffee shops. As this ice making machine, there are models such as a closed cell type, an open cell type, and a down flow type, for example, according to the difference of the ice making structure which makes the required ice block. The present invention relates to a deicing control method of a so-called batch type ice making machine in which ice is grown on an ice making portion by repeating an ice making process and a deicing process. First, a flow down type ice making machine is mentioned as a batch type example. The outline configuration will be described.

  The downflow type ice making machine 10 shown in FIG. 24 includes an ice making unit 14 for producing ice and a freezing circuit 30 for cooling the ice making unit 14, and ice pieces 17 dropped from the ice making unit 14 are stored in the ice storage 12. It has become so. The ice making unit 14 is provided below the pair of ice making plates (ice making units) 16 and 16 and the ice making plates 16 and 16 arranged opposite to each other in a vertical posture, and the ice making water flowing downward from both ice making plates 16 And an ice making water tank 18 for collecting and storing ice water). Further, in the ice making unit 14, an evaporator EP which constitutes a part of the refrigeration circuit 30 is disposed between the ice making plates 16 and 16. The ice making unit 14 includes a water spray unit (ice making water supply means) 20 for supplying ice making water from the ice making water tank 18 to the surface (ice making surface) 16a of each ice making plate 16, and the ice making plate 16 on the opposite side to the ice making surface 16a. And a deicing water supply means 24 for supplying deicing water to the surface (rear surface).

  As shown in FIG. 24, the ice making water tank 18 is formed in a box shape whose upper portion is open. The upper opening of the ice making water tank 18 is located directly below the ice making plates 16, 16, and the non-ice forming ice making water and deicing water flowing down from the ice making plates 16, 16 are recovered and used in the ice making operation. Retain as. Further, an ice guiding portion 28 is disposed above the ice making water tank 18 for guiding the ice removed from the ice making plates 16 and 16 during the deicing operation to the ice storage 12. A slit (not shown) is opened on each inclined surface of the ice guiding portion 28, and ice-free ice making water, deicing water and ice are separated by the ice guiding portion 28 and pass through the slits. Only the ice making water is collected in the ice making water tank 18.

  The water sprinkling unit 20 is provided above the pair of ice making plates 16 and 16 and is capable of sprinkling ice making water on the ice making surface 16 a; ice making water sprinkler 22 capable of sprinkling ice making water; It comprises an ice making water pump PM for pumping ice making water from the water tank 18. The water sprayer 20 supplies ice making water from the ice making water sprinkler 22 to the ice making surface 16a of the ice making plate 16 when the ice making water pump PM is driven in the ice making operation, while stopping the ice making water pump PM during deicing operation. The supply of ice making water to the ice making plate 16 is stopped. The deicing water supply means 24 is located below the ice making water sprinkler 22 and installed at an upper portion between the ice making plates 16 and 16 and is capable of sprinkling deicing water on the back surface of the ice making plate 16 , And a water supply valve WV interposed in a water supply pipe 25 connected to an external water source such as a water supply. The deicing water supply means 24 supplies deicing water from the deicing water sprinkler 26 to the back surface of the ice making plate 16 by opening the feeding valve WV in the deicing operation, while the feeding valve WV is closed during ice making operation. The supply of deicing water to the ice making plate 16 is stopped.

  The refrigeration circuit 30 shown in FIG. 24 comprises a compressor CM, a condenser CD, an expansion valve EV as pressure reducing means, and an evaporator EP disposed on the ice making plate 16. The circuit of the refrigeration circuit 30 is connected by a refrigerant pipe 31 so that the refrigerant circulates in the order of the compressor CM, the condenser CD, the expansion valve EV, and the evaporator EP. In addition, the refrigeration circuit 30 includes a bypass circuit including a bypass pipe 32 which directly leads the refrigerant from the compressor CM to the evaporator EP, and a hot gas valve HV inserted in the bypass pipe 32. In the ice making operation, the freezing circuit 30 cools the ice making plate 16 by the evaporator EP by closing the hot gas valve HV and driving the fan FM to cool the condenser CD and driving the compressor CM. . In the deicing operation, the freezing circuit 30 heats the ice making plate 16 by the hot gas supplied to the evaporator EP by stopping the fan FM and opening the hot gas valve HV while driving the compressor CM.

  Regarding the ice making unit 14 in FIG. 24, a water level detection device 38 to which the communicating pipe principle is applied is juxtaposed to the ice making water tank 18. That is, the water level detection device 38 comprises a water level detection box 42 communicated with the bottom of the ice making water tank 18 via the communication pipe 40, and a float switch FS housed in the water level detection box 42. The water level of water is detected by the float switch FS, and water level information is input to a control circuit (not shown). In the evaporator EP shown in FIG. 24, a temperature sensor Th1 (eg, a thermistor) for detecting the temperature of the refrigerant is disposed on the refrigerant outlet side of the evaporator EP, and the temperature sensor Th1 detects the temperature. The temperature information is inputted to the control circuit. A temperature sensor Th2 (for example, a temperature sensing element such as a thermistor) for detecting the temperature of the ice making water stored therein is disposed in the ice making water tank 18, and the temperature information detected by the temperature sensor Th2 is It is designed to be input to the control circuit. Further, a drain pipe 34 is connected to the bottom of the ice making water tank 18, and a drain valve DV is connected to the drain pipe 34 in communication. The drain valve DV is opened and closed according to a command from the control circuit, and the ice making water of the ice making water tank 18 can be discharged by opening the drain valve DV.

  FIG. 25 is a time chart showing the ice making process and the deicing process performed by the flow down type ice making machine 10 shown in FIG. In the ice making process, the pump motor PM of FIG. 24 is driven to press-feed the ice making water of the ice making water tank 18 to the ice making water sprinkler 22, and the ice making water sprinkler 22 scatters the ice making water to the ice making unit 16. A refrigerant is supplied from the compressor CM to the ice making unit 16 via the expansion means EV, and the ice making unit 16 is cooled to below the freezing point. Therefore, the ice making water freezes on the ice making surface 16a of the ice making unit 16 in the ice making process in the time chart of FIG. 25, and ice gradually grows. Further, the detected temperature of the refrigerant temperature sensor Th1 provided on the refrigerant outlet side of the evaporator EP gradually decreases.

  Then, when the ice making water in the ice making water tank 18 is supplied to the ice making unit 16 and starts to freeze in the ice making unit 16, the water level of the ice making water in the ice making water tank 18 gradually decreases. Since the float switch FS constantly detects a drop in the ice making water, when the float switch FS detects that the water level of the ice making water tank 18 has dropped to the lower limit water level (preset), the ice making It is determined that the ice has grown to a predetermined size in the portion 16, and the ice making process is switched to the deicing process as shown in FIG. That is, the hot gas valve HV shown in FIG. 24 is opened to supply the heat refrigerant from the compressor CM to the evaporator EP, thereby heating the ice making unit 16 and freezing the ice making unit 16. Start peeling. Further, the water supply valve WV shown in FIG. 24 is opened at the same time as switching to the deicing process, and the deicing water (normal temperature) from the deicing water supply means 24 is sprayed to the ice making section 16 via the deicing water sprinkler 26. Do.

  The temperature of the evaporator EP is raised by the thermal refrigerant supplied from the hot gas valve HV, and the detected temperature of the refrigerant temperature sensor Th1 gradually rises as shown in FIG. Then, for example, after the detected temperature of the refrigerant temperature sensor Th1 reaches 9 ° C., for example, after 10 seconds, the feed water valve WV is closed to stop the supply of deicing water to the ice making unit 16 and the pump shown in FIG. The motor PM is driven to spray the ice making water of the ice making water tank 18 into the ice making unit 16 via the ice making water sprinkler 22. Further, when, for example, 50 seconds have elapsed from the time when the feed valve WV is closed, it is determined that all the ice frozen in the ice making unit 16 has peeled off and dropped, and the hot gas valve HV is closed to The supply of the refrigerant is stopped to complete the deicing process, and the process moves to the next ice making process. Thus, a series of ice making cycles are achieved by batchwise repeating the ice making process and the deicing process.

JP, 2011-158210, A

  As described in the time chart of FIG. 25, in the downflow type ice making machine, by repeating the ice making process and the deicing process, ice is generated in the ice making unit, and ice is peeled off from the ice making unit and stored. Ice is collected into the storage. However, the ice in the ice making unit may grow too much due to various causes such as unevenness of each part in the ice making machine, unexpected inclination in the ice making unit, and excessive moisture intake due to excessive uptake of moisture. When the ice grows in this manner, the vertically adjacent ices in the ice making unit 16 in FIG. 24 are vertically connected, and even if they are separated from the ice making unit 16 in the deicing process, they do not fall smoothly. It may remain between the ice making section 16 and the ice guiding section 28 and block the ice dropping port. If it transfers to an ice making cycle in such a state, the ice which fell by the next deicing process will overlap with the ice which has already remained. Therefore, as the ice making cycle is repeated, the lower part of the ice making unit 16 which has not been recovered to the ice storage 12 is filled with ice, and this causes problems such as breakage of the ice making unit 16 and the like.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 1 is
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
During the deicing process, the temperature detected by the refrigerant temperature sensor is confirmed when a first time has elapsed from the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detects a predetermined rising temperature,
If the detected temperature is higher than a predetermined first temperature, the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor is lower than the first temperature and higher than a predetermined second temperature, the deicing process is extended for a second time, and then the process goes to the next ice making process;
If the detected temperature confirmed by the refrigerant temperature sensor is lower than the second temperature, the present invention is characterized in that the deicing process is performed again and then the process proceeds to the next ice making process.
According to the first aspect of the present invention, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the heat refrigerant to the evaporator of the ice making unit and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. When the refrigerant temperature sensor detects a predetermined temperature rise and a first time has elapsed, the following state is estimated depending on the temperature confirmed by the refrigerant temperature sensor.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

  The subject matter of the present invention is that the deicing process performed again is repeated a plurality of times.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 3 is:
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
During the deicing step, the detected temperature of the refrigerant temperature sensor is checked every N seconds from the time when a predetermined time has elapsed since the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detected a predetermined rising temperature. ,
If the detected temperature confirmed by the refrigerant temperature sensor continues to rise, or if the detected temperature is stable at 1 ° C. or higher, the deicing process is terminated and the process moves to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor continues to fall or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor continues to decrease for a preset time or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the deicing process is performed. The point is that we did it again.
According to the third aspect of the present invention, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the heat refrigerant to the evaporator of the ice making unit and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. The following state is estimated depending on the temperature of the refrigerant confirmed by the refrigerant temperature sensor every N seconds from the time when a predetermined time has passed since the refrigerant temperature sensor detected a predetermined rising temperature.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 4 is:
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
During the deicing process, the temperature detected by the refrigerant temperature sensor is confirmed when a first time has elapsed from the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detects a predetermined rising temperature,
If the detected temperature is higher than a predetermined temperature, the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor is lower than the predetermined temperature, the dewatering step is performed again after the drainage valve connected to the ice making water tank is opened to discharge the ice making water. It is a summary.
According to the invention of claim 4, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the heat refrigerant to the evaporator of the ice making unit and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. Depending on whether the temperature checked by the refrigerant temperature sensor is higher or lower than the predetermined temperature when the first time has elapsed since the refrigerant temperature sensor detected the predetermined rising temperature. Make the following judgments.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 5 is:
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
Detection of ice water temperature sensor disposed in the ice making water tank when a first time has elapsed from the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detects a predetermined rising temperature during the deicing step Check the temperature,
If the detected temperature is higher than a predetermined first temperature, the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the ice-making water temperature sensor is lower than the first temperature and higher than a predetermined second temperature, the deicing process is extended for a second time, and then the process goes to the next ice making process,
If the detected temperature confirmed by the ice-making water temperature sensor is lower than the second temperature, the present invention is characterized in that the deicing process is performed again and then the next ice-making process is started.
According to the fifth aspect of the present invention, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the thermal refrigerant to the evaporator of the ice making unit and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. Depending on the temperature of ice making water confirmed by the ice making water temperature sensor provided in the ice making water tank when the first time has passed since the refrigerant temperature sensor detected a predetermined rising temperature, the following state is estimated Do.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

  The gist of the invention according to claim 6 is that the deicing process performed again is repeated a plurality of times.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 7 is
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
During the deicing process, the temperature of the ice making water placed in the ice making water tank every N seconds from the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detects a predetermined rising temperature and a predetermined time has elapsed. Check the detected temperature of the sensor,
If the detected temperature confirmed by the ice making water temperature sensor continues to rise, or if the detected temperature is stable at 1 ° C. or higher, the deicing step is ended and the process moves to the next ice making step,
If the detected temperature confirmed by the ice making water temperature sensor continues to fall or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the next ice making process is performed,
If the detected temperature confirmed by the ice making water temperature sensor continues to decrease for a preset time or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the deicing process is performed. The point is that you have to do it again.
According to the invention of claim 7, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the heat refrigerant to the evaporator of the ice making unit, and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. The following state depending on the temperature of ice making water confirmed by the ice making water temperature sensor provided in the ice making water tank every N seconds from the time when a predetermined time has passed since the refrigerant temperature sensor detected a predetermined rising temperature Make a prospective decision.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

In order to solve the above problems and achieve the intended purpose, the invention according to claim 8 is:
An ice making step of supplying the refrigerant from the freezing circuit to the evaporator of the ice making unit through the expansion means and driving the pump motor of the ice making water tank to supply ice making water to the ice making unit to perform ice making;
When a float switch provided side by side with the ice making water tank detects a predetermined water level drop of the ice making water in the ice making water tank, the hot gas valve of the refrigeration circuit is opened to supply the heat refrigerant from the compressor to the evaporator. Further, in the ice making machine deicing control method, the water feeding valve of the external water system is opened to supply ice removing water to the ice making unit and ice is removed from the ice making unit.
Detection of ice water temperature sensor disposed in the ice making water tank when a first time has elapsed from the time when the refrigerant temperature sensor provided on the outlet side of the evaporator detects a predetermined rising temperature during the deicing step Check the temperature,
If the detected temperature is higher than a predetermined temperature, the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the ice making water temperature sensor is lower than the predetermined temperature, the dewatering step is performed again after the drainage valve connected to the ice making water tank is opened to discharge the ice making water. As the abstract.
According to the invention of claim 8, the process normally proceeds to the deicing process through the ice making process, and the hot gas valve is opened to supply the heat refrigerant to the evaporator of the ice making unit and the water supply valve is opened to normal temperature Since the temperature of the refrigerant provided on the refrigerant outlet side of the evaporator rises by supplying the deicing water of the above to the ice making unit, this temperature rise is monitored by the refrigerant temperature sensor. Whether the temperature of ice making water checked by the ice making water temperature sensor provided in the ice making water tank is higher than the predetermined temperature when the first time passes after the refrigerant temperature sensor detects the predetermined rising temperature Depending on whether it is low, make the following judgments.
(1) A state in which the ice completely drops out of the ice making section and is not clogged
(2) A state in which a part of the ice is thought to be clogged even if the ice drops from the ice making section
(3) A state in which the ice dropped from the ice making section is clogged up. According to the result of the above judgment, (1) The deicing process is finished and the process goes to the ice making process. (2) The deicing process is justified In addition, choose either to thaw and remove the ice that seems to be clogged in the ice making section, and (3) to perform the deicing process again to thaw and remove the ice clogged in the ice making section. By doing this, it is possible to prevent double ice making. That is, multiple ice making is not generated, and failure or damage of the ice making unit and peripheral parts can be effectively prevented.

  According to the present invention, at the end of the deicing process transferred from the ice making process, if the ice does not completely fall off the ice making section for some reason and remains behind the ice making section and clogged, The adverse effects of multiple ice making caused by shifting to the ice making process and further to the deicing process can be prevented in advance.

It is a time chart which shows the process of the first half in the deicing control method concerning Example 1 of the present invention. In the deicing control method of Example 1, it is a time chart which shows the behavior when the detection temperature of a refrigerant temperature sensor is higher than the 1st temperature. In the deicing control method of Example 1, it is a time chart which shows the behavior when the detection temperature of a refrigerant temperature sensor is higher than the 2nd temperature, and lower than the 1st temperature. In the deicing control method of Example 1, it is a time chart which shows the behavior when the detection temperature of a refrigerant temperature sensor is lower than the 2nd temperature. FIG. 5 is a time chart showing that the deicing process shown in FIG. 4 is repeated up to three times in succession. In the deicing control method of Example 2, it is a time chart which shows the behavior in case the detection temperature of a refrigerant temperature sensor is continuing rising. In the deicing control method of Example 2, it is a time chart which shows the behavior in case the detection temperature of a refrigerant temperature sensor is stabilized at 1 ° C or more. In the deicing control method of Example 2, it is a time chart which shows the behavior in the case where the detection temperature of a refrigerant temperature sensor continues falling or is stable below 1 ° C. In the deicing control method of Example 2, it is a time chart which shows the behavior in the case where the detection temperature of a refrigerant temperature sensor continues falling only for the time set up beforehand, or is stable below 1 ° C. In the deicing control method of Example 3, it is a time chart which shows the behavior when the detection temperature of a refrigerant temperature sensor is higher than predetermined temperature. In the deicing control method of Example 3, it is a time chart which shows the behavior when the detection temperature of a refrigerant temperature sensor is lower than predetermined temperature. In the deicing control method which concerns on Example 4 of this invention, it is a time chart of the ice making cycle in which the ice making process and the deicing process are repeated. FIG. 18 is a time chart illustrating the first half of the process of the deicing control method according to the fourth embodiment. In the deicing control method of Example 4, it is a time chart which shows the behavior in case the detection temperature of an ice-making water temperature sensor is higher than 1st temperature. In the deicing control method of Example 4, it is a time chart which shows the behavior when the detection temperature of an ice-making water temperature sensor is higher than 2nd temperature and lower than 1st temperature. In the deicing control method of Example 4, it is a time chart which shows a behavior when the detection temperature of an ice-making water temperature sensor is lower than 2nd temperature. FIG. 17 is a time chart showing that the deicing process shown in FIG. 16 is repeated up to three times in succession. In the deicing control method of Example 5, it is a time chart which shows the behavior in case the detection temperature of the ice-making water temperature sensor is continuing rising. In the deicing control method of Example 5, it is a time chart which shows a behavior in case detection temperature of an ice-making water temperature sensor is stabilized at 1 ° C or more. In the deicing control method of Example 5, it is a time chart which shows the behavior in the case where the detection temperature of the ice-making water temperature sensor continues falling or is stable below 1 ° C. In the deicing control method of Example 5, it is a time chart which shows the behavior in the case where the detection temperature of an ice-making water temperature sensor continues falling only for the time set beforehand, or it is stable below 1 ° C. In the deicing control method of Example 6, it is a time chart which shows a behavior when the detection temperature of an ice-making water temperature sensor is higher than predetermined temperature. In the deicing control method of Example 6, it is a time chart which shows the behavior when the detection temperature of an ice-making water temperature sensor is lower than predetermined temperature. It is explanatory drawing which shows the schematic structure of the down-flow type | formula ice making machine which performs an ice making by repeating an ice making process and a deicing process. FIG. 25 is a time chart of an ice making cycle in which the ice making process and the deicing process in the flow down type ice making machine shown in FIG. 24 are repeated.

  Next, a deicing control method of an ice making machine according to the present invention will be described by taking an ice making cycle of a flow-down type ice making machine as an example and referring to the attached drawings. The downflow type ice making machine exemplified here is of the mechanism described with reference to FIG. 24, and the basic ice making cycle of the ice making machine is as shown in the time chart of FIG.

  Further, the embodiments of the present invention are divided into the first to sixth embodiments, and the first to third embodiments use the detected temperature of the refrigerant temperature sensor provided on the refrigerant outlet side of the evaporator as a main index, and the second half In Examples 4 to 6, the detection temperature of the ice making water temperature sensor in the ice making water tank is used as a main index. The fourth embodiment corresponds to the first embodiment, the fifth embodiment corresponds to the second embodiment, and the sixth embodiment corresponds to the third embodiment. The detection index is different but the basic behavior is the same.

  According to the deicing control method according to the first embodiment, it is possible to prevent multiple ice making in advance by executing the control shown in FIGS. That is, in FIG. 1, as the ice making process approaches the end, the detected temperature of the refrigerant temperature sensor Th1 provided near the refrigerant outlet of the evaporator EP continues to decrease, but the float switch FS is in the ice making water of the ice making water tank 18 When a predetermined water level drop is detected, the process proceeds to the deicing step, the hot gas valve HV is opened, and the heat refrigerant is supplied to the evaporator EP. For this reason, the detected temperature of the refrigerant temperature sensor Th1 starts to rise as deicing progresses, and a timer (not shown) starts timing from, for example, the time when 9 ° C. is detected in FIG. To close the supply valve WV. In addition, driving of the pump motor PM is started, and the ice making water of the ice making water tank 18 is dispersedly supplied to the ice making unit 16.

  Then, when the first time T1 (for example, 60 seconds) elapses from the time when the refrigerant temperature sensor Th1 detects the predetermined rising temperature (9 ° C.), the control temperature of the refrigerant detected by the refrigerant temperature sensor Th1 is Confirm with (not shown). Then, in response to the temperature detected by the refrigerant temperature sensor Th1 at this time, any one of the following deicing control is performed.

(1) That is, if the detected temperature of the refrigerant temperature sensor Th1 is higher than a predetermined first temperature TM1 (for example, 5 ° C.), ice is detached from the ice making unit 16 and no ice jam occurs. Then, as shown in FIG. 2, the deicing process is finished and the process goes to the next ice making process. This is because even if ice is detached from the ice making unit 16, if the ice partially remains in the ice making unit 16, the detection temperature of the refrigerant temperature sensor Th1 continues to decrease.

(2) Further, as shown in FIG. 3, the temperature of the refrigerant detected by the refrigerant temperature sensor Th1 is lower than the first temperature TM1 (5 ° C.), and a predetermined second temperature TM2 (eg 3.) If the temperature is higher than 5 ° C., part of the ice detached from the ice making unit 16 may remain clogged below the ice making unit 16. Therefore, in this case, the ongoing deicing process is extended. That is, the supply of the thermal refrigerant to the evaporator EP is extended by the second time T2 (for example, 50 seconds) to increase the temperature of the ice suspected of remaining in the ice making unit 16 up. Heat it from the heat source to melt it off and move on to the next ice making process.

(3) When the temperature of the refrigerant detected by the refrigerant temperature sensor Th1 is lower than the predetermined temperature TM2 (3.5 ° C.), a part of the ice separated by the ice making unit 16 is the ice making unit It is judged that it is clogged and remains below 16. Therefore, as shown in FIG. 4, even after the ongoing deicing process is completed, the detachment and falling of the ice remaining in the ice making section 16 is promoted by continuing the deicing process again. When the deicing process is completed again, the process moves to the next ice making process.

  In addition, as shown in FIG. 5, re-execution of the deicing process in FIG. 4 is performed, for example, three times continuously, and after repeating this number of times, it is expected that ice is completely dropped from the ice making unit 16 Move to the next ice making process. Of course, re-execution of the deicing process up to three times is an example, and it is appropriate to increase or decrease the number of re-executions according to the specific situation of the site.

  The time charts of FIG. 6 to FIG. 9 show Example 2 of the deicing control method according to the present invention. That is, in FIG. 6, after the ice making process, which is a normal routine, is performed, the process moves to the deicing process. In this deicing step, as described above with reference to FIG. 1, a predetermined time T (for example, 10 seconds) from the time when the refrigerant temperature sensor Th1 on the refrigerant outlet side of the evaporator EP detects a predetermined rising temperature (9.degree. C.) The controller temperature (not shown) checks the temperature of the refrigerant detected by the refrigerant temperature sensor Th1 every N seconds (for example, 5 seconds) from the time when e. Then, in accordance with the refrigerant temperature detected by the refrigerant temperature sensor Th1, any of the following deicing control is performed.

(1) That is, as a result of confirming the detection temperature of the refrigerant temperature sensor Th1 every N seconds (5 seconds), as shown in FIG. 6, when the detection temperature continues to rise, the ice from the ice making unit 16 It is judged that C. has completely dropped out, and the deicing process is finished to shift to the next ice making process. Similarly, if the temperature detected every N seconds (5 seconds) in the refrigerant temperature sensor Th1 is stable at 1 ° C. or higher as shown in FIG. 7, ice is completely dropped from the ice making section 16 also in this case. The deicing process is finished, and the process goes to the next ice making process.

(2) Further, as a result of checking the temperature detected by the refrigerant temperature sensor Th1 every N seconds (5 seconds), as shown in FIG. 8, the detected temperature continues to decrease or stabilizes at less than 1 ° C. In this case, part of the ice removed from the ice making unit 16 may remain in the lower part of the ice making unit 16 and be clogged. At this time, the relevant deicing process is extended. That is, the supply of the thermal refrigerant from the hot gas valve HV to the evaporator EP is extended by the second time T2 (for example, 50 seconds), and the ice making unit 16 is further heated by the evaporator EP to continue the ice making unit The remaining ice below 16 is melted, and when the second time T2 is up, the extended de-icing process is finished, and the process goes to the next ice making process.

(3) If the refrigerant temperature checked every N seconds (5 seconds) by the refrigerant temperature sensor Th1 continues to decrease for a preset time (for example, 20 minutes) or is stable at less than 1 ° C., the ice making unit It is judged that ice remains in 16 and is clogged. At this time, as shown in FIG. 9, after the deicing process is extended for a predetermined time, the deicing process is performed again.

  The time charts of FIGS. 10 to 11 show Example 3 of the deicing control method according to the present invention. That is, in FIG. 10, after performing a normal ice making process, it transfers to a deicing process. In this deicing step, as described with reference to FIG. 1, the refrigerant is detected when a first time T1 (for example, 60 seconds) elapses from the time when the refrigerant temperature sensor Th1 detects a predetermined rising temperature (9 ° C.) The detected temperature of the temperature sensor Th1 is confirmed. Then, depending on the detected temperature of the refrigerant confirmed by the refrigerant temperature sensor Th1 at this time, any of the following deicing control is performed.

(1) If the detected temperature of the refrigerant confirmed by the refrigerant temperature sensor Th1 is higher than a predetermined temperature TM (for example, 3.5 ° C.), it is judged that the ice has completely dropped from the ice making unit 16, As shown in FIG. 10, the deicing process is completed, and the process proceeds to the next ice making process. Incidentally, as the predetermined temperature TM, a temperature lower than the first temperature TM1 (5.degree. C.) used in the control in FIG. 2 is selected, and for example, 3.5.degree. C. is preferable.

(2) Further, if the detected temperature of the refrigerant confirmed by the refrigerant temperature sensor Th1 is lower than the predetermined temperature TM (for example, 3.5 ° C.), it is estimated that ice remains in the ice making unit 16 and clogged It can. At this time, as shown in FIG. 11, the drainage valve DV of the drainage pipe 34 communicating with the ice making water tank 18 is opened to discharge the ice making water from the ice making water tank 18. After the ice making water in the ice making water tank 18 is discharged, the ice removing step is performed again, and the water removing valve of the normal temperature is dispersedly supplied to the ice making unit 16 from the water supply valve WV. The removal of the ice remaining in the ice making unit 16 is promoted in combination with the heat refrigerant.

  As described above, in the groups of Examples 4 to 6 below, the index of deicing control in each group is detected by ice water temperature sensor Th2 as the group of Examples 1 to 3. The behavior of the other basic control is the same except that the temperature of ice-making water (the former) or the temperature of the refrigerant detected by the refrigerant temperature sensor Th1 (the latter) is different.

  According to the deicing control method according to the fourth embodiment, multiple ice making can be prevented in advance by executing the control shown in FIGS. That is, in FIG. 12, as the ice making process approaches the end, the detected temperature of the refrigerant temperature sensor Th1 of the evaporator EP continues to decrease, and when the process goes to the deicing process, the hot gas valve HV is opened and the heat refrigerant is the evaporator. Supplied to the EP. For this reason, the detected temperature of the refrigerant temperature sensor Th1 starts to rise as deicing progresses, and in FIG. 12 and FIG. 13, for example, the timer starts counting from the time of detecting 9 ° C., for example, 10 seconds The supply valve WV is closed. In addition, driving of the pump motor PM is started, and the ice making water of the ice making water tank 18 is dispersedly supplied to the ice making unit 16.

  In addition, as shown in FIG. 24, the detection temperature of ice making water by the ice making water temperature sensor Th2 provided in the ice making water tank 18 is that the non-ice water (cooled) from the ice making unit 16 is ice making in the ice making process. In order to return to tank 18, it falls gradually. Next, in the deicing step, as shown in FIG. 13, since deicing water at normal temperature supplied from the water supply valve WV to the ice making unit 16 is recovered to the ice making water tank 18, ice making water in the ice making water tank 18 is produced. Temperature gradually rises. However, as described above, when the timer counts 10 seconds, the feed water valve WV is closed and the pump motor PM is driven to circulate the ice making water of the ice making water tank 18. After the detected temperature of water turns to fall, it becomes stable and flat.

  Then, when the first time T1 (for example, 60 seconds) elapses from the time when the refrigerant temperature sensor Th1 detects the predetermined rising temperature (9 ° C.), the detection temperature of ice water by the ice water temperature sensor Th2 is Check with the control unit (not shown). Then, in response to the detection temperature of the ice-making water temperature sensor Th2 at this time, any of the following deicing control is performed.

(1) That is, if the detection temperature of the ice-making water temperature sensor Th2 is higher than a predetermined first temperature TM1 (for example, 5 ° C.), the ice is detached from the ice making unit 16 and the ice is clogged Also, as shown in FIG. 14, the deicing process is finished and the process goes to the next ice making process. This is because, even if ice is detached from the ice making unit 16, if the ice partially remains in the ice making unit 16, the detection temperature of the refrigerant temperature sensor Th1 continues to decrease.

(2) Also, as shown in FIG. 15, the temperature of the ice making water detected by the ice making water temperature sensor Th2 is lower than the first temperature TM1 (5 ° C.), and a predetermined second temperature TM2 (for example, preset) If the temperature is higher than 3.5 ° C., a part of the ice detached from the ice making unit 16 may remain clogged below the ice making unit 16. Therefore, in this case, the ongoing deicing process is extended (partial addition of the deicing process). That is, the supply of the thermal refrigerant to the evaporator EP is extended by the second time T2 (for example, 50 seconds) to increase the temperature of the ice suspected of remaining in the ice making unit 16 It melts and falls off by heat transfer from and moves to the next ice making process.

(3) When the temperature of ice making water detected by the ice making water temperature sensor Th2 is lower than the predetermined temperature TM2 (3.5 ° C.), a part of the ice detached by the ice making unit 16 is It is determined that the lower part of the ice making unit 16 is clogged and remains. Therefore, as shown in FIG. 16, by performing the deicing process again following the ongoing deicing process, the detachment and falling of the ice remaining in the ice making unit 16 is promoted. When the deicing process is completed again, the process moves to the next ice making process.

  Note that, as shown in FIG. 17, re-execution of the deicing process in FIG. 16 is performed up to three times consecutively, for example, and after repeating this number of times, it is expected that ice is completely dropped from the ice making unit 16 Move to the next ice making process.

  The time charts of FIG. 18 to FIG. 21 show Example 5 of the deicing control method according to the present invention. That is, in FIG. 18, after the ice making process which is a normal routine is performed, the process moves to the deicing process. In this deicing step, as described above with reference to FIG. 12, a predetermined time T (e.g., 10 seconds) from the time when the refrigerant temperature sensor Th1 on the refrigerant outlet side of the evaporator EP detects a predetermined rising temperature (9.degree. C.) After the elapse of, the temperature of the ice making water detected by the ice making water temperature sensor Th2 is confirmed by a control unit (not shown) every N seconds (for example, 5 seconds). Then, in accordance with the ice making water temperature detected by the ice making water temperature sensor Th2, one of the following deicing control is performed.

(1) That is, as a result of confirming the detection temperature of the ice-making water temperature sensor Th2 every N seconds (5 seconds), as shown in FIG. 18, when the detection temperature continues to rise, from the ice making unit 16 It is judged that the ice has completely dropped, and the deicing process is finished to shift to the next ice making process. Also, if the detection temperature every N seconds (5 seconds) in the ice-water making temperature sensor Th2 is also stable at 1 ° C. or higher, as shown in FIG. Then, the deicing process is finished, and the process goes to the next ice making process.

(2) Moreover, as a result of confirming the detection temperature by the ice making water temperature sensor Th2 every N seconds (5 seconds), as shown in FIG. 20, the detection temperature continues to decrease or is stable at less than 1 ° C. In this case, part of the ice removed from the ice making unit 16 may remain in the lower part of the ice making unit 16 and be clogged. At this time, the relevant deicing process is extended. That is, the supply of the thermal refrigerant from the hot gas valve HV to the evaporator EP is extended by the second time T2 (for example, 50 seconds), and the ice making unit 16 is further heated by the evaporator EP to continue the ice making unit The remaining ice below 16 is melted, and when the second time T2 is up, the extended de-icing process is finished, and the process goes to the next ice making process.

(3) If the refrigerant temperature confirmed every N seconds (5 seconds) by the ice-making water temperature sensor Th2 continues to decrease for a preset time (for example, 20 minutes) or is stable at less than 1 ° C. It is estimated that ice remains in section 16 and is clogged. At this time, as shown in FIG. 21, after the deicing process is extended for a predetermined time, the deicing process is performed again.

  The time charts of FIG. 22 to FIG. 23 show Example 6 of the deicing control method according to the present invention. That is, in FIG. 22, after performing a normal ice making process, it transfers to a deicing process. In this deicing step, as described with reference to FIG. 12, when the ice making water temperature sensor Th2 detects a predetermined rising temperature (9 ° C.), when the first time T1 (for example, 60 seconds) elapses, the ice making The detected temperature of the water temperature sensor Th2 is confirmed. Then, one of the following deicing control is performed according to the detection temperature of the ice making water confirmed by the ice making water temperature sensor Th2 at this time.

(1) If the detection temperature of ice making water confirmed by the ice making water temperature sensor Th2 is higher than a predetermined temperature TM (for example, 3.5 ° C.), it is predicted that ice has completely dropped from the ice making unit 16 Then, as shown in FIG. 22, the deicing process is completed, and the process proceeds to the next ice making process. Incidentally, as the predetermined temperature TM, a temperature lower than the first temperature TM1 (5.degree. C.) used in the control in FIG. 2 is selected, and for example, 3.5.degree. C. is preferable.

(2) In addition, if the detection temperature of the ice making water confirmed by the ice making water temperature sensor Th2 is lower than the predetermined temperature TM (for example, 3.5 ° C.), it means that ice remains in the ice making unit 16 and is clogged It can be judged prospectively. At this time, as shown in FIG. 23, the drainage valve DV of the drainage pipe 34 communicating with the ice making water tank 18 is opened to discharge the ice making water from the ice making water tank 18. After the ice making water in the ice making water tank 18 is discharged, the ice removing step is performed again, and the water removing valve of the normal temperature is dispersedly supplied to the ice making unit 16 from the water supply valve WV. The removal of the ice remaining in the ice making unit 16 is promoted in combination with the heat refrigerant.

16 ice making unit, 18 ice making water tank, 30 refrigeration circuit, CM compressor,
DV drain valve, EP evaporator, EV expansion means, FS float switch,
HV hot gas valve, PM pump motor, T predetermined time,
T1 first time, T2 second time, Th1 refrigerant temperature sensor,
Th2 ice water temperature sensor, TM predetermined temperature, TM1 first temperature,
TM2 2nd temperature, WV water supply valve

Claims (8)

The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
The refrigerant temperature sensor at the time when a first time (T1) has elapsed from the time when a refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature during the deicing process Check the detected temperature of (Th1),
If the detected temperature is higher than a predetermined first temperature (TM1), the deicing process is finished and the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) is lower than the first temperature (TM1) and higher than a predetermined second temperature (TM2), the deicing process is extended by a second time (T2). Then move on to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) is lower than the second temperature (TM2), the ice removing process is performed again, and then the process proceeds to the next ice making process. Deicing control method of aircraft.   The deicing control method of the ice making machine according to claim 1, wherein the deicing process performed again is repeated a plurality of times. The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
During the deicing step, the refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature, and every N seconds after a predetermined time (T) has elapsed Check the detected temperature of the refrigerant temperature sensor (Th1),
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) continues to rise, or if the detected temperature is stable at 1 ° C. or higher, the deicing step is ended and the process moves to the next ice making step,
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) continues to decrease or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) continues to decrease for a preset time or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the removal is performed. A deicing control method of an ice making machine characterized in that the ice process is performed again. The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
The refrigerant temperature sensor at the time when a first time (T1) has elapsed from the time when a refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature during the deicing process Check the detected temperature of (Th1),
If the detected temperature is higher than a predetermined temperature (TM), the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the refrigerant temperature sensor (Th1) is lower than the predetermined temperature (TM), the drainage valve (DV) connected to the ice making water tank (18) is opened to discharge the ice making water, A deicing control method of an ice making machine characterized in that the deicing process is performed again. The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
The ice making water tank when a first time (T1) has elapsed from the time when a refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature during the deicing step Check the detection temperature of the ice making water temperature sensor (Th2) placed in (18),
If the detected temperature is higher than a predetermined first temperature (TM1), the deicing process is finished and the process goes to the next ice making process,
If the detected temperature confirmed by the ice making water temperature sensor (Th2) is lower than the first temperature (TM1) and higher than a predetermined second temperature (TM2), the deicing process is extended by a second time (T2) Then move on to the next ice making process,
If the detection temperature confirmed by the ice-making water temperature sensor (Th2) is lower than the second temperature (TM2), the deicing step is performed again and then the next ice making step is performed. Deicing control method of ice making machine.   The deicing control method of an ice making machine according to claim 5, wherein the second deicing step is repeated a plurality of times. The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
During the deicing step, the refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature, and every N seconds after a predetermined time (T) has elapsed Check the detection temperature of the ice making water temperature sensor (Th2) placed in the ice making water tank (18),
If the detected temperature confirmed by the ice-making water temperature sensor (Th2) continues to rise, or if the detected temperature is stable at 1 ° C. or higher, the deicing step is ended and the process moves to the next ice making step ,
If the detected temperature confirmed by the ice making water temperature sensor (Th2) continues to fall or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, and then the next ice making process is started. ,
If the detected temperature confirmed by the ice making water temperature sensor (Th2) continues to decrease for a preset time or is stable at less than 1 ° C., the deicing process is extended for a predetermined time, A deicing control method of an ice making machine characterized in that the deicing step is performed again. The refrigerant from the freezing circuit (30) is supplied to the evaporator (EP) of the ice making unit (16) through the expansion means (EV), and the pump motor (PM) of the ice making water tank (18) is driven to make ice An ice making process in which water is supplied to the ice making unit (16) to perform ice making;
When the float switch (FS) provided adjacent to the ice making water tank (18) detects a drop in the water level of the ice making water in the ice making water tank (18), the hot gas valve (HV) of the refrigeration circuit (30) is opened. Then, the heat refrigerant from the compressor (CM) is supplied to the evaporator (EP), and the water supply valve (WV) of the external water system is opened to supply deicing water to the ice making section (16). In an ice making machine deicing control method which repeats the deicing process of removing ice from the ice making unit (16),
The ice making water tank when a first time (T1) has elapsed from the time when a refrigerant temperature sensor (Th1) provided on the outlet side of the evaporator (EP) detects a predetermined rising temperature during the deicing step Check the detection temperature of the ice making water temperature sensor (Th2) placed in (18),
If the detected temperature is higher than a predetermined temperature (TM), the deicing process is ended and the process goes to the next ice making process,
If the detected temperature confirmed by the ice making water temperature sensor (Th2) is lower than the predetermined temperature (TM), the drainage valve (DV) connected to the ice making water tank (18) is opened to discharge the ice making water The deicing control method for an ice making machine, wherein the deicing step is performed again.

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