EP3904789B1 - Operation control method for ice maker - Google Patents
Operation control method for ice maker Download PDFInfo
- Publication number
- EP3904789B1 EP3904789B1 EP19902266.6A EP19902266A EP3904789B1 EP 3904789 B1 EP3904789 B1 EP 3904789B1 EP 19902266 A EP19902266 A EP 19902266A EP 3904789 B1 EP3904789 B1 EP 3904789B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ice
- making machine
- refrigerant
- pressure
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 34
- 239000003507 refrigerant Substances 0.000 claims description 69
- 230000008020 evaporation Effects 0.000 claims description 47
- 238000001704 evaporation Methods 0.000 claims description 47
- 230000007423 decrease Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 4
- 239000013535 sea water Substances 0.000 description 55
- 239000002002 slurry Substances 0.000 description 19
- 238000012856 packing Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000006399 behavior Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C5/00—Working or handling ice
- F25C5/02—Apparatus for disintegrating, removing or harvesting ice
- F25C5/04—Apparatus for disintegrating, removing or harvesting ice without the use of saws
- F25C5/12—Ice-shaving machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
- F25C1/14—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes
- F25C1/145—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes from the inner walls of cooled bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
- F25C1/14—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes
- F25C1/145—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes from the inner walls of cooled bodies
- F25C1/147—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes from the inner walls of cooled bodies by using augers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2301/00—Special arrangements or features for producing ice
- F25C2301/002—Producing ice slurries
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2600/00—Control issues
- F25C2600/04—Control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2700/00—Sensing or detecting of parameters; Sensors therefor
- F25C2700/08—Power to drive the auger motor of an auger type ice making machine
Definitions
- the operation of the ice-making machine that is an equipment-side element is controlled based on an operation command from the sensor mounted to the tank that is a facility-side element.
- abnormal communications with the facility side, and others may cause degradation in reliability of operation control on the ice-making machine.
- the method as recited in (3) includes increasing the evaporation temperature stepwise in accordance with an excess of the pressure difference. This configuration enables stepwise reduction in amount of ice made by the ice-making machine, by increasing the evaporation temperature stepwise in accordance with the excess, from the first pressure value, of the pressure difference between the pressure of the medium to be cooled at the inlet of the ice-making machine and the pressure of the medium to be cooled at the outlet of the ice-making machine.
- FIG. 1 is a schematic configuration diagram of an ice-making system A including an ice-making machine 1 to which the operation control method according to the present disclosure is applied.
- FIG. 2 is a side view of the ice-making machine 1 illustrated in FIG. 1 .
- the ice-making machine 1 continuously makes ice slurry from seawater (raw material) stored in a seawater tank (to be described later), and returns the ice slurry thus made to the seawater tank.
- seawater raw material
- seawater tank to be described later
- the ice-making system A also includes a control apparatus 30.
- the control apparatus 30 includes a central processing unit (CPU) and a memory such as a random access memory (RAM) or a read only memory (ROM).
- the control apparatus 30 achieves various kinds of control concerning an operation of the ice-making system A, including the operation control according to the present disclosure, in such a manner that the CPU executes a computer program stored in the memory.
- the four-way switching valve 4 is maintained at a state indicated by a solid line in FIG. 1 .
- the compressor 2 discharges a high-temperature and high-pressure gas refrigerant.
- the gas refrigerant flows into the heat source-side heat exchanger 3 that functions as a condenser, via the four-way switching valve 4.
- the heat source-side heat exchanger 3 condenses and liquefies the gas refrigerant by heat exchange with air provided by a fan 11.
- the liquefied refrigerant then flows into the utilization-side expansion valve 5 via the heat source-side expansion valve 6 in a fully open state and the receiver 8.
- the utilization-side expansion valve 5 decompresses the refrigerant to a predetermined low pressure.
- the low-pressure refrigerant then flows into an annular space 14 between an inner pipe 12 and an outer pipe 13 each serving as a part of an evaporator E of the ice-making machine 1, through a refrigerant inlet pipe to be described later.
- the refrigerant from the ice-making machine 1 is heated by the superheater 7 before being sucked into the compressor 2.
- the superheater 7 is of a double pipe type.
- the refrigerant from the ice-making machine 1 is superheated when passing a space between an inner pipe and an outer pipe of the superheater 7.
- the refrigerant thus superheated then returns to the compressor 2.
- the ice is accumulated in the inner pipe 12 (ice accumulation) to hinder the operation of the ice-making machine 1.
- a defrosting operation (a heating operation) is performed for melting the ice in the inner pipe 12.
- the four-way switching valve 4 is maintained at a state indicated by a broken line in FIG. 1 .
- the compressor 2 discharges the high-temperature and high-pressure gas refrigerant.
- the gas refrigerant flows into the annular space 14 between the inner pipe 12 and the outer pipe 13 of the ice-making machine 1 via the four-way switching valve 4.
- the gas refrigerant condenses and liquefies by heat exchange with the ice-containing seawater in the inner pipe 12.
- the liquefied refrigerant then flows into the heat source-side expansion valve 6 via the utilization-side expansion valve 5 in a fully open state and the receiver 8.
- the heat source-side expansion valve 6 decompresses the liquefied refrigerant to a predetermined low pressure. Thereafter, the refrigerant flows into the heat source-side heat exchanger 3 functioning as an evaporator.
- the refrigerant gasifies by heat exchange with air provided by the fan 11. Thereafter, the refrigerant is sucked into the compressor 2.
- the ice-making machine 1 is a portrait-oriented double pipe ice-making machine that includes the evaporator E including the inner pipe 12 and the outer pipe 13 whose axes extend horizontally, and an ice scraper to be described later.
- the evaporator E is of a flooded type, in which most of the annular space 14 between the inner pipe 12 and the outer pipe 13 is filled with the liquid refrigerant.
- the evaporator E thus enhances heat exchange efficiency of the refrigerant with the seawater.
- the refrigerating machine oil is easily discharged from the flooded-type evaporator.
- the refrigerating machine oil returns to the compressor 2 to compensate for unsatisfactory lubrication of the compressor 2, leading to improvement in reliability.
- the inner pipe 12 is an element through which the seawater serving as a medium to be cooled passes.
- the inner pipe 12 is made of a metal material such as stainless steel or iron.
- the inner pipe 12 has a cylindrical shape, and is disposed in the outer pipe 13.
- the inner pipe 12 has two ends that are closed.
- the ice scraper 15 is disposed to scrape sherbet-like ice slurry off an inner peripheral face of the inner pipe 12 and to disperse the sherbet-like ice slurry in the inner pipe 12.
- the inner pipe 12 is connected at its first axial end (the right side in FIG. 2 ) to a seawater inlet pipe 16 through which the seawater is supplied into the inner pipe 12, and is also connected at its second axial end (the left side in FIG. 2 ) to a seawater outlet pipe 17 through which the seawater is discharged from the inner pipe 12.
- the outer pipe 13 has a cylindrical shape, and is made of a metal material such as stainless steel or iron as in the inner pipe 12.
- the outer pipe 13 is connected at its lower side to a plurality of refrigerant inlet pipes 18 (three refrigerant inlet pipes 18 in FIG. 2 ), and is also connected at its upper side to a plurality of refrigerant outlet pipes 19 (two refrigerant outlet pipes 19 in FIG. 2 ).
- Each of the refrigerant inlet pipes 18 has on its upper end a refrigerant supply port 20 through which the refrigerant is supplied into the annular space 14.
- Each of the refrigerant outlet pipes 19 has on its lower end a refrigerant discharge port 21 through which the refrigerant is discharged from the annular space 14.
- a description will be given of a method for controlling an operation of the ice-making machine 1 in the ice-making system A. More specifically, a description will be given of an operation control method that involves changing operating conditions of the ice-making machine 1, stopping the ice-making machine 1, or restarting the ice-making machine 1, based on an ice packing factor in the seawater tank 9.
- the operation of the ice-making machine 1 is controlled using a drive current value of the motor 26 in the ice scraper 15, the drive current value being detected by the ammeter 31 and transmitted to the control apparatus 30.
- FIG. 5 is a graph of the behaviors of a current value in a case where the operation control according to the first embodiment is performed and the behaviors of a current value in a case where the operation control is not performed (the conventional art).
- the horizontal axis indicates a time (t)
- the vertical axis indicates a current value (A) of the motor 26 in the ice scraper 15.
- the operation control is not performed. Consequently, when the amount of ice in the inner pipe 12 exceeds a certain amount as the ice packing factor IPF increases with a lapse of a time, the drive current of the motor 26 sharply increases. Then, when the drive current exceeds a predetermined value A1, an overcurrent protective device is operated to stop the operation of the motor 26. In this case, since the motor 26 continuously operates at a high torque until the operation of the motor 26 is stopped, the blades 24, the support bars 23, and the like of the ice scraper 15 are possibly damaged.
- the thermostat When the current value of the motor 26 exceeds the second current value, that is, 11 A at the time t2, the thermostat is forcibly turned off to stop the operation of the ice-making machine 1.
- the thermostat Since ice is not newly made although the ice slurry in the seawater tank 9 is used, the amount of ice in the inner pipe 12 gradually decreases, and the drive current of the motor 26 also gradually decreases with this decrease.
- the thermostat which has been forcibly turned off, is turned on again to restart the operation of the ice-making machine 1.
- the amount of ice in the inner pipe 12 increases again after the restart of the operation of the ice-making machine 1.
- the thermostat is forcibly turned off again to stop the operation of the ice-making machine 1.
- the operation of the ice-making machine 1 that is an equipment-side element is controlled based on the current value of the motor 26 of the ice scraper 15 in the ice-making machine 1.
- This configuration thus improves the reliability of operation control on the ice-making machine 1 irrespective of occurrence of, for example, abnormal communications with an equipment side in the conventional art.
- This configuration enables a reduction in risk of damage to the blades 24 and the support bars 23 of the ice scraper 15 due to ice made excessively, and improves the reliability of the ice-making system A as a system.
- the evaporation temperature is increased stepwise in accordance with an excess of the current from the first current value. This configuration therefore enables stepwise reduction in amount of ice to be made by the ice-making machine 1.
- a pressure sensor 32 detects a pressure of the seawater at the seawater inlet pipe 16 of the ice-making machine 1
- a pressure sensor 33 detects a pressure of the seawater at the seawater outlet pipe 17 of the ice-making machine 1 (see FIG. 2 ).
- the operation of the ice-making machine 1 is controlled using pressure values which the pressure sensors 32 and 33 transmit to the control apparatus 30.
- the evaporation temperature of the refrigerant to be supplied into the evaporator E is increased. More specifically, in the second embodiment, the evaporation temperature is set higher stepwise in accordance with an excess of the pressure difference. For example, when the pressure difference is more than 0.03 MPa, but is equal to or less than 0.04 MPa, the operation is controlled to set the evaporation temperature 0.9 times as low as the normal evaporation temperature t0. In addition, when the pressure difference is more than 0.04 MPa, but is equal to or less than 0.05 MPa, the operation is controlled to set the evaporation temperature 0.8 times as low as the normal evaporation temperature t0. The amount of ice is decreased in such a manner that the evaporation temperature is set higher than the normal value in accordance with the increase in pressure difference.
- the thermostat when the pressure difference exceeds a second pressure value larger than the first pressure value, the thermostat is forcibly turned off to stop the operation of the ice-making machine 1. In other words, the operation of the compressor 2 is stopped to stop the circulation of the refrigerant through the refrigerant circuit. It should be noted that the ice scraper 15 is continuously operated even when the thermostat is forcibly turned off. After the thermostat is forcibly turned off, when the pressure difference decreases to a certain value, for example, 0.06 MPa, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of the compressor 2.
- the operation of the ice-making machine 1 that is an equipment-side element is controlled based on the pressure difference between the pressure of the seawater (the medium to be cooled) at the seawater inlet pipe 16 of the ice-making machine 1 and the pressure of the seawater at the seawater outlet pipe 17 of the ice-making machine 1.
- This configuration thus improves the reliability of operation control on the ice-making machine 1 irrespective of occurrence of, for example, abnormal communications with an equipment side in the conventional art.
- This configuration enables a reduction in risk of damage to the blades 24 and the support bars 23 of the ice scraper 15 due to ice made excessively, and improves the reliability of the ice-making system A as a system.
- the evaporation temperature is increased stepwise in accordance with an excess of the pressure difference from the first pressure value. This configuration therefore enables stepwise reduction in amount of ice to be made by the ice-making machine 1.
- the first current value of the motor and the second current value larger than the first current value are 6 A and 11 A, respectively.
- these current values are merely exemplary, and the present disclosure is not limited thereto.
- the first current value and the second current value are selectable as appropriate based on the size of the ice scraper, the characteristics of the motor, and others.
- the first pressure value and the second pressure value larger than the first pressure value are 0.03 MPa and 0.08 MPa, respectively.
- these pressure values are merely exemplary, and the present disclosure is not limited thereto.
- the first pressure value and the second pressure value are selectable as appropriate based on the size of the ice scraper, the characteristics of the pump, and others.
- the thermostat when the current value of the motor decreases to 9 A, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of the compressor.
- the current value at the time when the thermostat is turned on again is not limited thereto, and is selectable as appropriate based on the size of the ice scraper, the characteristics of the motor, and others.
- the evaporation temperature is increased stepwise in accordance with an excess of the current or the pressure difference.
- the evaporation temperature may alternatively be increased linearly in accordance with the excess.
- the evaporation temperature is increased stepwise in accordance with an excess of the current or the pressure difference.
- the evaporation temperature may alternatively be increased by a preset temperature when the current or the pressure difference exceeds the first current value or the first pressure value.
- the pressure sensor 32 configured to detect a pressure of the seawater at the inlet of the ice-making machine 1 is disposed near the seawater inlet pipe 16.
- the pressure sensor 32 may be disposed at any location as long as it is capable of detecting a pressure of the seawater before heat exchange with the refrigerant in the evaporator E.
- the pressure sensor 32 may be disposed at a position S1 indicated by a chain double-dashed line in FIG. 2 (inside the inner pipe 12).
- the pressure sensor 33 may be disposed at a position S2 indicated by a chain double-dashed line in FIG. 2 (inside the inner pipe 12).
- the evaporator E is of a flooded type, in which most of the annular space 14 between the inner pipe 12 and the outer pipe 13 is filled with the liquid refrigerant.
- the evaporator E may alternatively be of a type, in which the refrigerant is jetted through a nozzle into the annular space 14 between the inner pipe 12 and the outer pipe 13.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Production, Working, Storing, Or Distribution Of Ice (AREA)
Description
- The present disclosure relates to a method for controlling an operation of an ice-making machine. More specifically, the present disclosure relates to a method for controlling an operation of an ice-making machine configured to make sherbet-like ice slurry.
- Sherbet-like ice slurry has occasionally been used for refrigerating fish and the like. Heretofore, for example, a double pipe ice-making machine including an inner pipe and an outer pipe has been known as an apparatus for making such ice slurry (refer to, for example,
JP 3 888 789 A - Further examples of previously known methods for controlling an operation of an ice-making machine are derivable from
JP 2003 042610 A US 6 694 752 B2 , which forms basis for the two-part form ofindependent claims 1 and 3. - In the ice-making system that includes the ice-making machine described above, if a ratio of ice in the tank (ice/(ice + medium to be cooled)), that is, an ice packing factor IPF becomes too large, pipes in the ice-making system are clogged, and ice making efficiency is degraded. For this reason, the ice packing factor in the tank is set to fall within a certain range. In view of this, heretofore, an amount of ice in the tank has been estimated using a water-level sensor, an ultrasonic sensor, or the like mounted to the tank, and the operation of the ice-making machine has been controlled based on the amount of ice thus estimated.
- In the ice-making system, however, the operation of the ice-making machine that is an equipment-side element is controlled based on an operation command from the sensor mounted to the tank that is a facility-side element. As a result, abnormal communications with the facility side, and others may cause degradation in reliability of operation control on the ice-making machine.
- An object of the present disclosure is to provide a method for controlling an operation of an ice-making machine, the method being capable of improving the reliability of operation control.
- The object above is solved by means of a method for controlling an operation of an ice-making machine according to
independent claims 1 and/or 3. Distinct embodiments are derivable from the dependent claims.
A first aspect of the present disclosure has the following configurations. - (1) A method for controlling an operation of an ice-making machine configured to make ice by cooling a medium to be cooled, through heat exchange with a refrigerant in a refrigerant circuit including a compressor,
the method including:- increasing an evaporation temperature of the refrigerant to be supplied to the ice-making machine when a drive current for an ice scraper of the ice-making machine is more than a first current value;
- with the ice scraper being continuously operated, stopping an operation of the compressor when the drive current is more than a second current value that is larger than the first current value; and
- after stopping the operation of the compressor when the drive current is more than the second current value, restarting the operation of the compressor when the drive current decreases to a predetermined value.
The operation control method according to the first aspect of the present disclosure includes controlling the operation of the ice-making machine, based on the current value of the ice scraper in the ice-making machine that is an equipment-side element. This configuration therefore enables improvement in reliability of operation control on the ice-making machine without conventional abnormal communications with an equipment side, and others. - (2) The method as recited in (1) includes increasing the evaporation temperature stepwise in accordance with an excess of the current.
- This configuration enables stepwise reduction in amount of ice made by the ice-making machine, by increasing the evaporation temperature stepwise in accordance with the excess from the first current value at the ice scraper of the ice-making machine.
- An operation control method according to a second aspect of the present disclosure has the following configurations.
- (3) A method for controlling an operation of an ice-making machine configured to make ice by cooling a medium to be cooled, through heat exchange with a refrigerant in a refrigerant circuit including a compressor (2),
the method including: - increasing an evaporation temperature of the refrigerant to be supplied to the ice-making machine when a pressure difference between a pressure of the medium to be cooled at an inlet of the ice-making machine and a pressure of the medium to be cooled at an outlet of the ice-making machine is more than a first pressure value,
- with an ice scraper of the ice-making machine being continuously operated, stopping an operation of the compressor when the pressure difference is more than a second pressure value that is larger than the first pressure value; and after stopping the operation of the compressor when the pressure difference is larger than the second pressure value, restarting the operation of the compressor when the pressure difference decreases to a predetermined value.
- The operation control method according to the second aspect of the present disclosure includes controlling the operation of the ice-making machine, based on the pressure difference between the pressure of the medium to be cooled at the inlet of the ice-making machine that is an equipment-side element and the pressure of the medium to be cooled at the outlet of the ice-making machine. This configuration therefore enables improvement in reliability of operation control on the ice-making machine without conventional abnormal communications with an equipment side, and others.
- (4) The method as recited in (3) includes increasing the evaporation temperature stepwise in accordance with an excess of the pressure difference. This configuration enables stepwise reduction in amount of ice made by the ice-making machine, by increasing the evaporation temperature stepwise in accordance with the excess, from the first pressure value, of the pressure difference between the pressure of the medium to be cooled at the inlet of the ice-making machine and the pressure of the medium to be cooled at the outlet of the ice-making machine.
-
- [
FIG. 1] FIG. 1 is a schematic configuration diagram of an exemplary ice-making system including an ice-making machine to which an operation control method according to the present disclosure is applied. - [
FIG. 2] FIG. 2 is a side view of the ice-making machine illustrated inFIG. 1 . - [
FIG. 3] FIG. 3 is a sectional view of an ice scraper in the ice-making machine illustrated inFIG. 2 . - [
FIG. 4] FIG. 4 illustrates exemplary control on an evaporation temperature in an operation control method according to a first embodiment. - [
FIG. 5] FIG. 5 is a graph of a behavior of a motor current in the operation control method according to the first embodiment. - [
FIG. 6] FIG. 6 illustrates exemplary control on an evaporation temperature in an operation control method according to a second embodiment. - Hereinafter, a specific description will be given of an operation control method according to the present disclosure with reference to the accompanying drawings.
- First, a description will be given of an exemplary ice-making system including an ice-making machine to which an operation control method according to the present disclosure is applied.
-
FIG. 1 is a schematic configuration diagram of an ice-making system A including an ice-makingmachine 1 to which the operation control method according to the present disclosure is applied.FIG. 2 is a side view of the ice-makingmachine 1 illustrated inFIG. 1 . In the ice-making system A, the ice-makingmachine 1 continuously makes ice slurry from seawater (raw material) stored in a seawater tank (to be described later), and returns the ice slurry thus made to the seawater tank. The term "ice slurry" refers to sherbet-like ice in which fine ice is formed and suspended within water or a solution of water. The ice slurry is also called slurry ice, ice slurry, slurry ice, sluff ice, or liquid ice. The ice-making system A is capable of continuously making seawater-based ice slurry. The ice-making system A is therefore introduced in, for example, a fishing boat or a fishing port, and the ice slurry returned to the seawater tank is used for, for example, keeping fresh fish cool. In the illustrated ice-making system A, a resupply pump (not illustrated) resupplies new seawater to the seawater tank in accordance with an amount of the used (consumed) ice slurry. - The ice-making system A adopts seawater as a medium to be cooled. The ice-making system A also includes, in addition to the ice-making
machine 1 serving as a part of a utilization-side heat exchanger, acompressor 2, a heat source-side heat exchanger 3, a four-way switching valve 4, a utilization-side expansion valve 5, a heat source-side expansion valve 6, asuperheater 7, areceiver 8, a seawater tank (a reservoir tank) 9, and apump 10. The ice-makingmachine 1, thecompressor 2, the heat source-side heat exchanger 3, the four-way switching valve 4, the utilization-side expansion valve 5, the heat source-side expansion valve 6, thesuperheater 7, and thereceiver 8 each serve as a part of a refrigeration apparatus. These apparatuses or members are interconnected via pipes to form a refrigerant circuit. The ice-makingmachine 1, theseawater tank 9, and thepump 10 are interconnected via pipes to form a seawater circuit. In the ice-making system A, each of the ice-makingmachine 1, thecompressor 2, the heat source-side heat exchanger 3, the four-way switching valve 4, the utilization-side expansion valve 5, the heat source-side expansion valve 6, thesuperheater 7, thereceiver 8, and the like is an equipment-side element, and each of theseawater tank 9, thepump 10, the pipes, and the like is a facility-side element. - The ice-making system A also includes a
control apparatus 30. Thecontrol apparatus 30 includes a central processing unit (CPU) and a memory such as a random access memory (RAM) or a read only memory (ROM). Thecontrol apparatus 30 achieves various kinds of control concerning an operation of the ice-making system A, including the operation control according to the present disclosure, in such a manner that the CPU executes a computer program stored in the memory. - In a normal ice-making operation, the four-
way switching valve 4 is maintained at a state indicated by a solid line inFIG. 1 . Thecompressor 2 discharges a high-temperature and high-pressure gas refrigerant. The gas refrigerant flows into the heat source-side heat exchanger 3 that functions as a condenser, via the four-way switching valve 4. The heat source-side heat exchanger 3 condenses and liquefies the gas refrigerant by heat exchange with air provided by afan 11. The liquefied refrigerant then flows into the utilization-side expansion valve 5 via the heat source-side expansion valve 6 in a fully open state and thereceiver 8. The utilization-side expansion valve 5 decompresses the refrigerant to a predetermined low pressure. The low-pressure refrigerant then flows into anannular space 14 between aninner pipe 12 and anouter pipe 13 each serving as a part of an evaporator E of the ice-makingmachine 1, through a refrigerant inlet pipe to be described later. - In the
annular space 14, the refrigerant evaporates by heat exchange with the seawater which thepump 10 supplies into theinner pipe 12. The seawater is cooled by the evaporation of the refrigerant. The seawater then returns to theseawater tank 8 via theinner pipe 12. The refrigerant gasifies by the evaporation in the ice-makingmachine 1. Thereafter, the refrigerant is sucked into thecompressor 2. At this time, if the refrigerant that is not sufficiently evaporated in the ice-makingmachine 1 and slightly left liquefied is sucked into thecompressor 2, an abrupt increase in pressure inside a compressor cylinder (liquid compression) or a decrease in viscosity of a refrigerating machine oil causes a failure in thecompressor 2. In order to protect thecompressor 2, the refrigerant from the ice-makingmachine 1 is heated by thesuperheater 7 before being sucked into thecompressor 2. Thesuperheater 7 is of a double pipe type. The refrigerant from the ice-makingmachine 1 is superheated when passing a space between an inner pipe and an outer pipe of thesuperheater 7. The refrigerant thus superheated then returns to thecompressor 2. - If the flow of the seawater is stagnated in the
inner pipe 12 of the ice-makingmachine 1, the ice is accumulated in the inner pipe 12 (ice accumulation) to hinder the operation of the ice-makingmachine 1. In this case, a defrosting operation (a heating operation) is performed for melting the ice in theinner pipe 12. At this time, the four-way switching valve 4 is maintained at a state indicated by a broken line inFIG. 1 . Thecompressor 2 discharges the high-temperature and high-pressure gas refrigerant. The gas refrigerant flows into theannular space 14 between theinner pipe 12 and theouter pipe 13 of the ice-makingmachine 1 via the four-way switching valve 4. In theannular space 14, the gas refrigerant condenses and liquefies by heat exchange with the ice-containing seawater in theinner pipe 12. The liquefied refrigerant then flows into the heat source-side expansion valve 6 via the utilization-side expansion valve 5 in a fully open state and thereceiver 8. The heat source-side expansion valve 6 decompresses the liquefied refrigerant to a predetermined low pressure. Thereafter, the refrigerant flows into the heat source-side heat exchanger 3 functioning as an evaporator. During the defrosting operation, in the heat source-side heat exchanger 3 functioning as an evaporator, the refrigerant gasifies by heat exchange with air provided by thefan 11. Thereafter, the refrigerant is sucked into thecompressor 2. - The ice-making
machine 1 is a portrait-oriented double pipe ice-making machine that includes the evaporator E including theinner pipe 12 and theouter pipe 13 whose axes extend horizontally, and an ice scraper to be described later. The evaporator E is of a flooded type, in which most of theannular space 14 between theinner pipe 12 and theouter pipe 13 is filled with the liquid refrigerant. The evaporator E thus enhances heat exchange efficiency of the refrigerant with the seawater. In addition, when most of theannular space 14 is filled with the liquid refrigerant, the refrigerating machine oil is easily discharged from the flooded-type evaporator. The refrigerating machine oil returns to thecompressor 2 to compensate for unsatisfactory lubrication of thecompressor 2, leading to improvement in reliability. - The
inner pipe 12 is an element through which the seawater serving as a medium to be cooled passes. Theinner pipe 12 is made of a metal material such as stainless steel or iron. Theinner pipe 12 has a cylindrical shape, and is disposed in theouter pipe 13. Theinner pipe 12 has two ends that are closed. In theinner pipe 12, theice scraper 15 is disposed to scrape sherbet-like ice slurry off an inner peripheral face of theinner pipe 12 and to disperse the sherbet-like ice slurry in theinner pipe 12. Theinner pipe 12 is connected at its first axial end (the right side inFIG. 2 ) to a seawater inlet pipe 16 through which the seawater is supplied into theinner pipe 12, and is also connected at its second axial end (the left side inFIG. 2 ) to a seawater outlet pipe 17 through which the seawater is discharged from theinner pipe 12. - The
outer pipe 13 has a cylindrical shape, and is made of a metal material such as stainless steel or iron as in theinner pipe 12. Theouter pipe 13 is connected at its lower side to a plurality of refrigerant inlet pipes 18 (threerefrigerant inlet pipes 18 inFIG. 2 ), and is also connected at its upper side to a plurality of refrigerant outlet pipes 19 (tworefrigerant outlet pipes 19 inFIG. 2 ). Each of therefrigerant inlet pipes 18 has on its upper end arefrigerant supply port 20 through which the refrigerant is supplied into theannular space 14. Each of therefrigerant outlet pipes 19 has on its lower end arefrigerant discharge port 21 through which the refrigerant is discharged from theannular space 14. - As illustrated in
FIGS. 2 and3 , theice scraper 15 includes ashaft 22, asupport bar 23, ablade 24, and amotor 26. Theshaft 22 has a second axial end that extends outward from aflange 25 on the second axial end of theinner pipe 12. Theshaft 22 is connected at the second axial end to themotor 26 serving as a part of a drive unit for driving theshaft 22. Themotor 26 is provided with anammeter 31 that detects a drive current of themotor 26 and transmits the drive current to thecontrol apparatus 30. Theice scraper 15 includes a plurality of the support bars 23 disposed upright on a peripheral face ofshaft 22 at predetermined spacings, and a plurality ofblades 24 respectively mounted to the distal ends of the support bars 23. Each of theblades 24 is, for example, a band plate-shaped member made of a synthetic resin. Each of theblades 24 has a tapered side edge directed forward in its rotational direction. - The
annular space 14 is defined with an outer peripheral face of theinner pipe 12 and an inner peripheral face of theouter pipe 13 to form refrigerant paths that extend from therefrigerant supply ports 20 on the lower side of theouter pipe 13 to therefrigerant discharge ports 21 on the upper side of theouter pipe 13. - Next, a description will be given of a method for controlling an operation of the ice-making
machine 1 in the ice-making system A. More specifically, a description will be given of an operation control method that involves changing operating conditions of the ice-makingmachine 1, stopping the ice-makingmachine 1, or restarting the ice-makingmachine 1, based on an ice packing factor in theseawater tank 9. - In the ice-making system A, as the ice packing factor IPF in the
seawater tank 9 increases through the operation of the ice-makingmachine 1, the amount of ice to be discharged from theseawater tank 9 increases, and the amount of ice in theinner pipe 12 of the ice-makingmachine 1 also increases. The increase in amount of ice in theinner pipe 12 causes an increase in driving torque of themotor 26 in theice scraper 15 that scrapes the sherbet-like ice slurry off the inner peripheral face of theinner pipe 12. The increase in driving torque causes an increase in drive current of themotor 26. In the first embodiment, the operation of the ice-makingmachine 1 is controlled using a drive current value of themotor 26 in theice scraper 15, the drive current value being detected by theammeter 31 and transmitted to thecontrol apparatus 30. - If the ice is excessively retained in the
seawater tank 9 due to the increase in ice packing factor IPF of the seawater in theseawater tank 9, the seawater containing a large amount of ice flows into the ice-makingmachine 1, so that the current value of themotor 26 in theice scraper 15 becomes larger than usual. In the first embodiment, when the current of themotor 26 exceeds a first current value, an evaporation temperature of the refrigerant to be supplied to the ice-makingmachine 1 is increased. -
FIG. 4 illustrates exemplary control on the evaporation temperature in the operation control method according to the first embodiment. InFIG. 4 , the vertical axis indicates a magnification of the evaporation temperature of the refrigerant in the evaporator E, that is, a ratio of the evaporation temperature to a normal evaporation temperature to be described later. In this control example, when the current value detected by theammeter 31 is equal to or less than 6 A, the evaporation temperature is set at a normal set temperature t0 (e.g., -15°C). In the first embodiment, when the current value exceeds the first current value, that is, 6 A, the evaporation temperature of the refrigerant to be supplied into the evaporator E is increased. More specifically, in the first embodiment, the evaporation temperature is set higher stepwise in accordance with an excess of the current. For example, when the current value is more than 6 A, but is equal to or less than 7 A, the operation is controlled to set the evaporation temperature 0.9 times as low as the normal evaporation temperature t0. In addition, when the current value is more than 7 A, but is equal to or less than 8 A, the operation is controlled to set the evaporation temperature 0.8 times as small as the normal evaporation temperature t0. The amount of ice made by the ice-makingmachine 1 is decreased in such a manner that the evaporation temperature is set higher than the normal value in accordance with the increase in current value. - In the first embodiment, when the current value exceeds a second current value (e.g., 11 A) larger than the first current value, a thermostat is forcibly turned off to stop the operation of the ice-making
machine 1. In other words, the operation of thecompressor 2 is stopped to stop the circulation of the refrigerant through the refrigerant circuit. It should be noted that theice scraper 15 is continuously operated even when the thermostat is forcibly turned off. After the thermostat is forcibly turned off, when the current value of themotor 26 decreases to a certain value, for example, 9 A, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of thecompressor 2. -
FIG. 5 is a graph of the behaviors of a current value in a case where the operation control according to the first embodiment is performed and the behaviors of a current value in a case where the operation control is not performed (the conventional art). InFIG. 5 , the horizontal axis indicates a time (t), and the vertical axis indicates a current value (A) of themotor 26 in theice scraper 15. - According to the conventional art, the operation control is not performed. Consequently, when the amount of ice in the
inner pipe 12 exceeds a certain amount as the ice packing factor IPF increases with a lapse of a time, the drive current of themotor 26 sharply increases. Then, when the drive current exceeds a predetermined value A1, an overcurrent protective device is operated to stop the operation of themotor 26. In this case, since themotor 26 continuously operates at a high torque until the operation of themotor 26 is stopped, theblades 24, the support bars 23, and the like of theice scraper 15 are possibly damaged. - The operation control according to the first embodiment is equal to that according to the conventional art in the current value of the
motor 26 until the time t1 at which the amount of ice in theinner pipe 12 reaches a certain amount. According to the first embodiment, however, the current value of themotor 26 gradually increases after the time t1. Since the amount of ice is decreased in such a manner that the value of the evaporation temperature is set larger than usual in accordance with the increase in current value as described above, the increase in current value in the first embodiment is gentler than that in the conventional art. - When the current value of the
motor 26 exceeds the second current value, that is, 11 A at the time t2, the thermostat is forcibly turned off to stop the operation of the ice-makingmachine 1. With this configuration, since ice is not newly made although the ice slurry in theseawater tank 9 is used, the amount of ice in theinner pipe 12 gradually decreases, and the drive current of themotor 26 also gradually decreases with this decrease. When the current value of themotor 26 falls below 9 A at a time t3, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of the ice-makingmachine 1. The amount of ice in theinner pipe 12 increases again after the restart of the operation of the ice-makingmachine 1. When the current value of themotor 26 exceeds 11 A at a time t4, the thermostat is forcibly turned off again to stop the operation of the ice-makingmachine 1. - In the first embodiment, the operation of the ice-making
machine 1 that is an equipment-side element is controlled based on the current value of themotor 26 of theice scraper 15 in the ice-makingmachine 1. This configuration thus improves the reliability of operation control on the ice-makingmachine 1 irrespective of occurrence of, for example, abnormal communications with an equipment side in the conventional art. This configuration enables a reduction in risk of damage to theblades 24 and the support bars 23 of theice scraper 15 due to ice made excessively, and improves the reliability of the ice-making system A as a system. - In the first embodiment, the evaporation temperature is increased stepwise in accordance with an excess of the current from the first current value. This configuration therefore enables stepwise reduction in amount of ice to be made by the ice-making
machine 1. - In order to control the operation of the ice-making
machine 1, a second embodiment focuses attention on an increase in pressure loss of the seawater flowing through theinner pipe 12 of the ice-makingmachine 1 from the inlet toward the outlet with an increase in amount of ice in theinner pipe 12. According to the second embodiment, specifically, the evaporation temperature of the refrigerant to be supplied to the ice-makingmachine 1 is increased when a pressure difference between a pressure of the seawater (the medium to be cooled) at the inlet of the ice-makingmachine 1 and a pressure of the seawater at the outlet of the ice-makingmachine 1 exceeds a first pressure value. In the second embodiment, apressure sensor 32 detects a pressure of the seawater at the seawater inlet pipe 16 of the ice-makingmachine 1, and apressure sensor 33 detects a pressure of the seawater at the seawater outlet pipe 17 of the ice-making machine 1 (seeFIG. 2 ). The operation of the ice-makingmachine 1 is controlled using pressure values which thepressure sensors control apparatus 30. -
FIG. 6 illustrates exemplary control on an evaporation temperature in the operation control method according to the second embodiment. InFIG. 6 , the vertical axis indicates a magnification of the evaporation temperature of the refrigerant in the evaporator E, that is, a ratio of the evaporation temperature to a normal evaporation temperature to be described later. In this control example, the evaporation temperature is set at a normal set temperature t0 (e.g., -15°C) during a period that the pressure difference between the pressure of the seawater at the seawater inlet pipe 16, the pressure being detected by thepressure sensor 32, and the pressure of the seawater at the seawater outlet pipe 17, the pressure being detected by thepressure sensor 33, is equal to or less than 0.03 MPa. In the second embodiment, when the pressure difference exceeds a first pressure value, that is, 0.03 MPa, the evaporation temperature of the refrigerant to be supplied into the evaporator E is increased. More specifically, in the second embodiment, the evaporation temperature is set higher stepwise in accordance with an excess of the pressure difference. For example, when the pressure difference is more than 0.03 MPa, but is equal to or less than 0.04 MPa, the operation is controlled to set the evaporation temperature 0.9 times as low as the normal evaporation temperature t0. In addition, when the pressure difference is more than 0.04 MPa, but is equal to or less than 0.05 MPa, the operation is controlled to set the evaporation temperature 0.8 times as low as the normal evaporation temperature t0. The amount of ice is decreased in such a manner that the evaporation temperature is set higher than the normal value in accordance with the increase in pressure difference. - In the second embodiment, when the pressure difference exceeds a second pressure value larger than the first pressure value, the thermostat is forcibly turned off to stop the operation of the ice-making
machine 1. In other words, the operation of thecompressor 2 is stopped to stop the circulation of the refrigerant through the refrigerant circuit. It should be noted that theice scraper 15 is continuously operated even when the thermostat is forcibly turned off. After the thermostat is forcibly turned off, when the pressure difference decreases to a certain value, for example, 0.06 MPa, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of thecompressor 2. - According to the second embodiment, the operation of the ice-making
machine 1 that is an equipment-side element is controlled based on the pressure difference between the pressure of the seawater (the medium to be cooled) at the seawater inlet pipe 16 of the ice-makingmachine 1 and the pressure of the seawater at the seawater outlet pipe 17 of the ice-makingmachine 1. This configuration thus improves the reliability of operation control on the ice-makingmachine 1 irrespective of occurrence of, for example, abnormal communications with an equipment side in the conventional art. This configuration enables a reduction in risk of damage to theblades 24 and the support bars 23 of theice scraper 15 due to ice made excessively, and improves the reliability of the ice-making system A as a system. - In the second embodiment, the evaporation temperature is increased stepwise in accordance with an excess of the pressure difference from the first pressure value. This configuration therefore enables stepwise reduction in amount of ice to be made by the ice-making
machine 1. - The present disclosure is not limited to the foregoing embodiments, and various modifications may be made within the claims.
- For example, in the foregoing embodiment (the first embodiment), the first current value of the motor and the second current value larger than the first current value are 6 A and 11 A, respectively. However, these current values are merely exemplary, and the present disclosure is not limited thereto. The first current value and the second current value are selectable as appropriate based on the size of the ice scraper, the characteristics of the motor, and others.
- Likewise, in the foregoing embodiment (the second embodiment), the first pressure value and the second pressure value larger than the first pressure value are 0.03 MPa and 0.08 MPa, respectively. However, these pressure values are merely exemplary, and the present disclosure is not limited thereto. The first pressure value and the second pressure value are selectable as appropriate based on the size of the ice scraper, the characteristics of the pump, and others.
- Moreover, in the foregoing embodiment (the first embodiment), when the current value of the motor decreases to 9 A, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of the compressor. However, the current value at the time when the thermostat is turned on again is not limited thereto, and is selectable as appropriate based on the size of the ice scraper, the characteristics of the motor, and others.
- Likewise, in the foregoing embodiment (the second embodiment), when the pressure difference between the pressures at the inlet and outlet of the ice-making machine decreases to 0.06 MPa, the thermostat, which has been forcibly turned off, is turned on again to restart the operation of the compressor. However, the pressure difference at the time when the thermostat is turned on again is not limited thereto, and is selectable as appropriate based on the size of the ice scraper, the characteristics of the pump, and others.
- Moreover, in the foregoing embodiments, the evaporation temperature is increased stepwise in accordance with an excess of the current or the pressure difference. The evaporation temperature may alternatively be increased linearly in accordance with the excess. Also in the foregoing embodiments, the evaporation temperature is increased stepwise in accordance with an excess of the current or the pressure difference. The evaporation temperature may alternatively be increased by a preset temperature when the current or the pressure difference exceeds the first current value or the first pressure value.
- Moreover, in the foregoing embodiment (the second embodiment), the
pressure sensor 32 configured to detect a pressure of the seawater at the inlet of the ice-makingmachine 1 is disposed near the seawater inlet pipe 16. However, thepressure sensor 32 may be disposed at any location as long as it is capable of detecting a pressure of the seawater before heat exchange with the refrigerant in the evaporator E. For example, thepressure sensor 32 may be disposed at a position S1 indicated by a chain double-dashed line inFIG. 2 (inside the inner pipe 12). The same applies to thepressure sensor 33 configured to detect a pressure of the seawater at the outlet of the ice-makingmachine 1. Thepressure sensor 33 may be disposed at a position S2 indicated by a chain double-dashed line inFIG. 2 (inside the inner pipe 12). - In the foregoing embodiments, the evaporator E is of a flooded type, in which most of the
annular space 14 between theinner pipe 12 and theouter pipe 13 is filled with the liquid refrigerant. The evaporator E may alternatively be of a type, in which the refrigerant is jetted through a nozzle into theannular space 14 between theinner pipe 12 and theouter pipe 13. -
- 1: ICE-MAKING MACHINE
- 2: COMPRESSOR
- 3: HEAT SOURCE-SIDE HEAT EXCHANGER
- 4: FOUR-WAY SWITCHING VALVE
- 5: UTILIZATION-SIDE EXPANSION VALVE
- 6: HEAT SOURCE-SIDE EXPANSION VALVE
- 7: SUPERHEATER
- 8: RECEIVER
- 9: SEAWATER TANK
- 10: PUMP
- 11: FAN
- 12: INNER PIPE
- 13: OUTER PIPE
- 14: ANNULAR SPACE
- 15: ICE SCRAPER
- 16: SEAWATER INLET PIPE
- 17: SEAWATER OUTLET PIPE
- 18: REFRIGERANT INLET PIPE
- 19: REFRIGERANT OUTLET PIPE
- 20: REFRIGERANT SUPPLY PORT
- 21: REFRIGERANT DISCHARGE PORT
- 22: SHAFT
- 23: SUPPORT BAR
- 24: BLADE
- 25: FLANGE
- 26: MOTOR
- 30: CONTROL APPARATUS
- 31: AMMETER
- 32: PRESSURE SENSOR
- 33: PRESSURE SENSOR
- A: ICE-MAKING SYSTEM
- E: EVAPORATOR
Claims (4)
- A method for controlling an operation of an ice-making machine (1) configured to make ice by cooling a medium to be cooled, through heat exchange with a refrigerant in a refrigerant circuit including a compressor (2),
the method comprising:increasing an evaporation temperature of the refrigerant to be supplied to the ice-making machine (1) when a drive current for an ice scraper (15) of the ice-making machine (1) is more than a first current value.characterized in thatwith the ice scraper (15) being continuously operated, stopping an operation of the compressor (2) when the drive current is more than a second current value that is larger than the first current value; andafter stopping the operation of the compressor (2) when the drive current is more than the second current value, restarting the operation of the compressor (2) when the drive current decreases to a predetermined value. - The method according to claim 1, comprising:
increasing the evaporation temperature stepwise in accordance with an excess of the current. - A method for controlling an operation of an ice-making machine (1) configured to make ice by cooling a medium to be cooled, through heat exchange with a refrigerant in a refrigerant circuit including a compressor (2),
the method comprising:increasing an evaporation temperature of the refrigerant to be supplied to the ice-making machine (1) when a pressure difference between a pressure of the medium to be cooled at an inlet of the ice-making machine (1) and a pressure of the medium to be cooled at an outlet of the ice-making machine (1) is more than a first pressure valuecharacterized in thatwith an ice scraper (15) of the ice-making machine (1) being continuously operated, stopping an operation of the compressor (2) when the pressure difference is more than a second pressure value that is larger than the first pressure value; andafter stopping the operation of the compressor (2) when the pressure difference is larger than the second pressure value, restarting the operation of the compressor (2) when the pressure difference decreases to a predetermined value. - The method according to claim 3, comprising:
increasing the evaporation temperature stepwise in accordance with an excess of the pressure difference.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2018245322A JP6760361B2 (en) | 2018-12-27 | 2018-12-27 | Operation control method of ice machine |
PCT/JP2019/033661 WO2020136997A1 (en) | 2018-12-27 | 2019-08-28 | Operation control method for ice maker |
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EP3904789A1 EP3904789A1 (en) | 2021-11-03 |
EP3904789A4 EP3904789A4 (en) | 2022-03-09 |
EP3904789B1 true EP3904789B1 (en) | 2023-04-26 |
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EP19902266.6A Active EP3904789B1 (en) | 2018-12-27 | 2019-08-28 | Operation control method for ice maker |
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US (1) | US20220057130A1 (en) |
EP (1) | EP3904789B1 (en) |
JP (1) | JP6760361B2 (en) |
CN (1) | CN113227681A (en) |
WO (1) | WO2020136997A1 (en) |
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CN115388590B (en) * | 2022-08-23 | 2024-03-22 | 广东美的白色家电技术创新中心有限公司 | Ice making module and ice making equipment |
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2018
- 2018-12-27 JP JP2018245322A patent/JP6760361B2/en active Active
-
2019
- 2019-08-28 US US17/417,816 patent/US20220057130A1/en not_active Abandoned
- 2019-08-28 CN CN201980085900.1A patent/CN113227681A/en active Pending
- 2019-08-28 WO PCT/JP2019/033661 patent/WO2020136997A1/en unknown
- 2019-08-28 EP EP19902266.6A patent/EP3904789B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN113227681A (en) | 2021-08-06 |
EP3904789A1 (en) | 2021-11-03 |
EP3904789A4 (en) | 2022-03-09 |
JP6760361B2 (en) | 2020-09-23 |
WO2020136997A1 (en) | 2020-07-02 |
JP2020106212A (en) | 2020-07-09 |
US20220057130A1 (en) | 2022-02-24 |
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