EP3904789A1 - Betriebssteuerungsverfahren für eiserzeuger - Google Patents
Betriebssteuerungsverfahren für eiserzeuger Download PDFInfo
- Publication number
- EP3904789A1 EP3904789A1 EP19902266.6A EP19902266A EP3904789A1 EP 3904789 A1 EP3904789 A1 EP 3904789A1 EP 19902266 A EP19902266 A EP 19902266A EP 3904789 A1 EP3904789 A1 EP 3904789A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ice
- making machine
- refrigerant
- pressure
- seawater
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000003507 refrigerant Substances 0.000 claims abstract description 67
- 230000008020 evaporation Effects 0.000 claims abstract description 48
- 238000001704 evaporation Methods 0.000 claims abstract description 48
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000013535 sea water Substances 0.000 description 55
- 239000002002 slurry Substances 0.000 description 19
- 230000007423 decrease Effects 0.000 description 8
- 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
- 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
-
- 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
- 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
- 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
- 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 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.
- 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, Patent Literature 1).
- An ice-making system that includes such an ice-making machine also includes a tank for storing a medium to be cooled, such as seawater. The medium to be cooled is supplied from the tank to an inner pipe of the ice-making machine, and ice slurry is made through heat exchange of the medium to be cooled with a refrigerant supplied to an annular space between an outer pipe and the inner pipe of the ice-making machine. The ice slurry thus made is returned to the tank.
- Patent Literature 1 Japanese Patent No. 3,888,789
- 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.
- 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.
- a method for controlling an operation of an ice-making machine (hereinafter, also simply referred to as an "operation control method") according to a first aspect of the present disclosure has the following configurations.
- the operation control method 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.
- 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.
- the method as recited in (1) or (2) includes stopping the operation of the ice-making machine when the drive current is more than a second current value that is larger than the first current value.
- An operation control method has the following configurations. (4) 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, 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.
- the operation control method 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.
- the method as recited in (4) 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.
- the method as recited in (4) or (5) includes stopping the operation of the ice-making machine when the pressure difference is more than a second pressure value that is larger than the first pressure value.
- 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 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.
- 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, a compressor 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, a superheater 7, a receiver 8, a seawater tank (a reservoir tank) 9, and a pump 10.
- the ice-making machine 1, the compressor 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, the superheater 7, and the receiver 8 each serve as a part of a refrigeration apparatus.
- each of the ice-making machine 1, the compressor 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, the superheater 7, the receiver 8, and the like is an equipment-side element
- each of the seawater tank 9, the pump 10, the pipes, and the like is a facility-side element.
- 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 evaporates by heat exchange with the seawater which the pump 10 supplies into the inner pipe 12.
- the seawater is cooled by the evaporation of the refrigerant.
- the seawater then returns to the seawater tank 8 via the inner pipe 12.
- the refrigerant gasifies by the evaporation in the ice-making machine 1. Thereafter, the refrigerant is sucked into the compressor 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 the compressor 2.
- 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.
- the ice scraper 15 includes a shaft 22, a support bar 23, a blade 24, and a motor 26.
- the shaft 22 has a second axial end that extends outward from a flange 25 on the second axial end of the inner pipe 12.
- the shaft 22 is connected at the second axial end to the motor 26 serving as a part of a drive unit for driving the shaft 22.
- the motor 26 is provided with an ammeter 31 that detects a drive current of the motor 26 and transmits the drive current to the control apparatus 30.
- the ice scraper 15 includes a plurality of the support bars 23 disposed upright on a peripheral face of shaft 22 at predetermined spacings, and a plurality of blades 24 respectively mounted to the distal ends of the support bars 23.
- Each of the blades 24 is, for example, a band plate-shaped member made of a synthetic resin.
- Each of the blades 24 has a tapered side edge directed forward in its rotational direction.
- the annular space 14 is defined with an outer peripheral face of the inner pipe 12 and an inner peripheral face of the outer pipe 13 to form refrigerant paths that extend from the refrigerant supply ports 20 on the lower side of the outer pipe 13 to the refrigerant discharge ports 21 on the upper side of the outer pipe 13.
- 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.
- the seawater containing a large amount of ice flows into the ice-making machine 1, so that the current value of the motor 26 in the ice scraper 15 becomes larger than usual.
- the current of the motor 26 exceeds a first current value, an evaporation temperature of the refrigerant to be supplied to the ice-making machine 1 is increased.
- FIG. 4 illustrates exemplary control on the evaporation temperature in the operation control method according to the first embodiment.
- 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.
- the evaporation temperature is set at a normal set temperature t0 (e.g., -15°C).
- t0 e.g., -15°C
- the evaporation temperature is set higher stepwise in accordance with an excess of the current.
- the operation is controlled to set the evaporation temperature 0.9 times as low as the normal evaporation temperature t0.
- 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-making machine 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.
- a thermostat 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 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 current value of the motor 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 the compressor 2.
- a certain value for example, 9 A
- 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 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 the inner pipe 12 reaches a certain amount. According to the first embodiment, however, the current value of the motor 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.
- 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 second embodiment focuses attention on an increase in pressure loss of the seawater flowing through the inner pipe 12 of the ice-making machine 1 from the inlet toward the outlet with an increase in amount of ice in the inner pipe 12.
- the evaporation temperature of the refrigerant to be supplied to the ice-making machine 1 is increased when a pressure difference between a pressure of the seawater (the medium to be cooled) at the inlet of the ice-making machine 1 and a pressure of the seawater at the outlet of the ice-making machine 1 exceeds a first pressure value.
- 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.
- FIG. 6 illustrates exemplary control on an evaporation temperature in the operation control method according to the second embodiment.
- 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.
- 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 the pressure sensor 32, and the pressure of the seawater at the seawater outlet pipe 17, the pressure being detected by the pressure sensor 33, is equal to or less than 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.
- 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 thermostat 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.
- 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.
- 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.
Landscapes
- 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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018245322A JP6760361B2 (ja) | 2018-12-27 | 2018-12-27 | 製氷機の運転制御方法 |
PCT/JP2019/033661 WO2020136997A1 (ja) | 2018-12-27 | 2019-08-28 | 製氷機の運転制御方法 |
Publications (3)
Publication Number | Publication Date |
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EP3904789A1 true EP3904789A1 (de) | 2021-11-03 |
EP3904789A4 EP3904789A4 (de) | 2022-03-09 |
EP3904789B1 EP3904789B1 (de) | 2023-04-26 |
Family
ID=71127091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19902266.6A Active EP3904789B1 (de) | 2018-12-27 | 2019-08-28 | Betriebssteuerungsverfahren für eiserzeuger |
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---|---|
US (1) | US20220057130A1 (de) |
EP (1) | EP3904789B1 (de) |
JP (1) | JP6760361B2 (de) |
CN (1) | CN113227681A (de) |
WO (1) | WO2020136997A1 (de) |
Families Citing this family (1)
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CN115388590B (zh) * | 2022-08-23 | 2024-03-22 | 广东美的白色家电技术创新中心有限公司 | 一种制冰模块及制冰设备 |
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-
2018
- 2018-12-27 JP JP2018245322A patent/JP6760361B2/ja active Active
-
2019
- 2019-08-28 CN CN201980085900.1A patent/CN113227681A/zh active Pending
- 2019-08-28 US US17/417,816 patent/US20220057130A1/en not_active Abandoned
- 2019-08-28 EP EP19902266.6A patent/EP3904789B1/de active Active
- 2019-08-28 WO PCT/JP2019/033661 patent/WO2020136997A1/ja unknown
Also Published As
Publication number | Publication date |
---|---|
JP6760361B2 (ja) | 2020-09-23 |
EP3904789B1 (de) | 2023-04-26 |
EP3904789A4 (de) | 2022-03-09 |
CN113227681A (zh) | 2021-08-06 |
WO2020136997A1 (ja) | 2020-07-02 |
US20220057130A1 (en) | 2022-02-24 |
JP2020106212A (ja) | 2020-07-09 |
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