JP2019124445A - Ice making system - Google Patents

Abstract

To provide an ice making system that can reduce running cost and improve reliability of a compressor.SOLUTION: In an ice making system A, an ice maker 1 for making ice by cooling a medium to be cooled by a refrigerant, a storage tank 8 for storing the medium to be cooled, and a pump 9 for supplying the medium to be cooled to the ice maker 1 are connected by pipes. The ice making system comprises a bypass pipe 27 connecting a pipe P1 returning to the storage tank 8 from the ice maker 1, and a pipe P2 between an outlet 25 provided in a lower part of the storage tank 8 and the pump 9.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to ice making systems. More particularly, it relates to an ice making system for producing a sherbet like ice slurry.

  In order to refrigerate fish etc., a sherbet ice slurry may be used. As a device for producing such an ice slurry, a double-tube type ice making machine provided with an inner pipe and an outer pipe is conventionally known (see, for example, Patent Document 1). The double-tube type ice making machine described in Patent Document 1 includes an inner pipe and an outer pipe provided coaxially with the inner pipe on the radially outer side of the inner pipe. Cold water or brine, which is a medium to be cooled, flows into the inner pipe from an inlet provided at one end of the inner pipe and flows out from an outlet provided at the other end of the inner pipe. On the other hand, coolant that cools cold water or brine is jetted into the annular space between the inner pipe and the outer pipe through a plurality of orifices.

Patent No. 3888789 Specification

  Conventionally, as a method of promoting the formation of ice slurry in an ice making machine including a double-tube type ice making machine as described above, it has been practiced to increase the subcooling of the medium to be cooled in order to make ice nuclei easy to form. There is. As a means for increasing the subcooling of the object to be cooled, the evaporation temperature of the refrigerant is lowered to increase Δt (the temperature of the medium to be cooled−the evaporation temperature of the refrigerant).

  However, in the conventional method, it is necessary to increase the load on the compressor in order to lower the evaporation temperature of the refrigerant, and the electricity cost (running cost) is increased. In addition, since the pressure ratio of the compressor is high, the discharge temperature is increased, and as a result, the temperature of the refrigerator oil is increased, the oil is deteriorated, and the lubricating performance is decreased, which may lower the reliability of the compressor. is there.

  The present disclosure aims to provide an ice making system capable of reducing running costs and improving compressor reliability.

An ice making system according to a first aspect of the present disclosure is
(1) Ice-making machine in which an ice-making machine which cools a medium to be cooled with a refrigerant to generate ice, a storage tank which stores the medium to be cooled, and a pump which supplies the medium to be cooled to the ice-making machine A system,
It has a bypass pipe which connects piping which returns to a storage tank from the above-mentioned ice maker, and piping between an outlet provided in the lower part of the above-mentioned storage tank, and the above-mentioned pump.

  In the ice making system according to the first aspect of the present disclosure, a core of ice (hereinafter also referred to as "ice core") is generated in the ice making machine, and a bypass medium is branched from a pipe in which a medium to be cooled including this is returned to the storage tank. The bypass pipe is connected to the pipe between the outlet of the storage tank and the pump. For this reason, it is possible to promote the formation of ice inside the ice making machine by supplying the ice making machine with the medium to be cooled including the ice nuclei, which reaches the pump via the bypass pipe without returning to the storage tank. As it is not necessary to increase the load on the compressor to lower the evaporation temperature of the refrigerant to increase the subcooling of the medium to be cooled as in the prior art, the electricity cost (running cost) can be reduced. In addition, since the pressure ratio of the compressor does not increase, the reliability of the compressor can be improved.

  (2) In the ice making system of (1), a first sensor for detecting the temperature of the medium to be cooled at the inlet of the ice making machine, and a second sensor for detecting the temperature of the medium to be cooled at the outlet of the ice making machine And it is desirable to have a bypass valve which is provided in the bypass weir and controls the opening and closing of the bypass pipe based on the temperature detected by the first sensor and the second sensor. In this case, the opening and closing control of the bypass valve can be performed based on the temperature of the medium to be cooled at the inlet and outlet of the ice making machine, and the flow of the medium to be cooled to the pump via the bypass pipe can be controlled. Thereby, the to-be-cooled medium containing an ice core can be supplied to an ice making machine on a timely basis, and generation | occurrence | production of ice can be promoted.

(3) In the ice making system according to (1) or (2), the ice making machine includes an inner pipe and an outer pipe provided coaxially with the inner pipe on the radially outer side of the inner pipe, A medium to be cooled can be made to flow in the inner pipe, and a refrigerant can be made to flow in the space between the inner pipe and the outer pipe. In this case, by supplying the medium to be cooled including the ice core to the pump via the bypass pipe without returning to the storage tank to the double-tube type ice making machine, the inner pipe of the double-tube type ice making machine Promote the formation of ice.

An ice making system according to a second aspect of the present disclosure is
(4) An ice making machine which cools a medium to be cooled with a refrigerant to generate ice, a storage tank which stores the medium to be cooled, has an outlet at a lower portion, and a pump which supplies the medium to be cooled to the ice machine An ice making system connected by piping,
A second outlet is provided above the storage tank.

  In the ice making system according to the second aspect of the present disclosure, a second outlet is provided above the storage tank in addition to the outlet at the lower part of the storage tank. In storage tanks, there are usually many ice nuclei at the top. For this reason, the production | generation of ice can be promoted by supplying the ice making machine with the to-be-cooled medium containing many ice nuclei from a 2nd outlet via a pump.

An ice making system according to a third aspect of the present disclosure,
(5) An ice making machine which cools a medium to be cooled with a refrigerant to generate ice, a storage tank which stores the medium to be cooled, has an outlet at a lower portion, and a pump which supplies the medium to be cooled to the ice machine An ice making system connected by piping,
It has a Venturi pipe provided in piping between the pump and the ice making machine, and a bypass pipe connecting piping returning from the ice making machine to the storage tank, and a small diameter portion of the Venturi pipe.

  In the ice making system according to the third aspect of the present disclosure, a venturi pipe is provided in a pipe between the pump and the ice maker, and a small diameter portion of the venturi pipe and a pipe from the ice making machine to the storage tank are connected. A bypass pipe is provided. By utilizing the fact that the static pressure of the cooling medium passing through the Venturi tube is reduced at the small diameter portion of the Venturi tube, the cooling medium including the ice nuclei in the pipe returning from the ice making machine to the storage tank is bypassed. By supplying to the ice making machine via, it is possible to promote the formation of ice inside the ice making machine.

FIG. 1 is a schematic block diagram of an embodiment of an ice making system of the present disclosure. It is side explanatory drawing of the double pipe | tube type ice making machine in the ice making system shown by FIG. It is cross-sectional explanatory drawing of the braid | blade mechanism in the double tube | pipe type icemaker shown by FIG. It is a figure which shows the change of the entrance / exit temperature of the conventional double tube | pipe type | formula ice making machine. It is a figure explaining opening-and-closing control of a bypass valve. It is a schematic block diagram of other embodiment of the ice making system of this indication. It is a schematic block diagram of another embodiment of the ice making system of this indication.

  Hereinafter, the ice making system of the present disclosure will be described in detail with reference to the attached drawings. Note that the present disclosure is not limited to these exemplifications, is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

First Embodiment
FIG. 1 is a schematic configuration view of an ice making system A according to an embodiment (first embodiment) of the present disclosure, and FIG. 2 is a side view of a double-tube type ice making machine 1 in the ice making system A shown in FIG. FIG.
The ice making system A uses seawater as a medium to be cooled, and the compressor 2, heat source side heat exchanger 3, four-way switching valve 4, use side expansion valve other than the double pipe type ice making machine 1 constituting the use side heat exchanger. A valve 5, a heat source side expansion valve 30, a superheater 6, a receiver 7, a seawater tank (storage tank) 8, and a pump 9 are provided. The double pipe ice maker 1, the compressor 2, the heat source side heat exchanger 3, the four way switching valve 4, the use side expansion valve 5, the heat source side expansion valve 30, the superheater 6, and the receiver 7 are connected by piping It constitutes a refrigerant circuit. Further, the double-tube type ice making machine 1, the seawater tank 8, and the pump 9 are also connected by piping similarly to constitute a seawater circulation path.

  During a normal ice making operation, the four-way switching valve 4 is held in the state shown by the solid line in FIG. The high temperature / high pressure gaseous refrigerant discharged from the compressor 2 flows through the four-way switching valve 4 into the heat source side heat exchanger 3 functioning as a condenser, and exchanges heat with air by the operation of the blower fan 10 to condense Liquefy. The liquefied refrigerant flows into the use side expansion valve 5 through the heat source side expansion valve 30 and the receiver 7 in the fully open state and the superheater 6. The refrigerant is depressurized to a predetermined low pressure by the use side expansion valve 5 and is discharged from the inner pipe 12 constituting the double pipe type ice making machine 1 from the jet nozzle of the nozzle (not shown) of the double pipe type ice making machine 1 It is jetted into the annular space 14 between the tube 13 and the tube 13.

  The refrigerant ejected into the annular space 14 exchanges heat with the seawater flowing into the inner pipe 12 by the pump 9 and evaporates. The seawater cooled by the evaporation of the refrigerant flows out of the inner pipe 12 and returns to the seawater tank 8. The refrigerant evaporated and vaporized in the double-tube type ice making machine 1 is sucked into the compressor 2. At that time, if the refrigerant containing the liquid without being evaporated by the double-tube type ice-making machine 1 enters the compressor 2, the compressor 2 breaks down due to the rapid high pressure (liquid compression) and the viscosity decrease of the refrigerator oil. In order to protect the compressor 2, the refrigerant leaving the double-tube type ice making machine 1 is heated by the superheater 6 and returned to the compressor 2. The superheater 6 is a double-pipe type, and the refrigerant leaving the double-pipe type ice making machine 1 is heated while passing through the space between the inner pipe and the outer pipe of the superheater 6, and returns to the compressor 2 .

  In addition, when the flow of seawater in the inner pipe 12 of the double-pipe type ice making machine 1 stagnates and ice is accumulated in the inner pipe 12 (ice accumulation), the double-pipe type ice making machine 1 can not operate. . In this case, a defrost operation is performed to melt the ice in the inner pipe 12. At this time, the four-way switching valve 4 is held in the state shown by the broken line in FIG. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 2 passes through the four-way switching valve 4 and the superheater 6 and is in the annular space 14 between the inner pipe 12 and the outer pipe 13 which constitute the double-tube type ice making machine 1 , And heat exchange with seawater including ice in the inner pipe 12 to condense and liquefy. The liquefied refrigerant flows into the heat source side expansion valve 30 through the utilization side expansion valve 5 and the superheater 6 in a fully open state and the receiver 7, is decompressed to a predetermined low pressure by the heat source side expansion valve 30, and functions as an evaporator It flows into the heat source side heat exchanger 3. During the defrosting operation, the refrigerant flowing into the heat source side heat exchanger 3 functioning as an evaporator exchanges heat with air by the operation of the blower fan 10, is vaporized, and is sucked into the compressor 2.

The double-tube type ice making machine 1 is a horizontal tube type double-tube type ice-making machine provided with an evaporator comprising an inner pipe 12 and an outer pipe 13 and a blade mechanism 15.
The inner pipe 12 is an element through which seawater as a medium to be cooled passes through, and is made of a metal material such as stainless steel or iron. Both ends of the inner pipe 12 are closed, and a blade mechanism 15 for scraping the sherbet ice slurry generated on the inner circumferential surface of the inner pipe 12 and dispersing it in the inner pipe 12 is disposed therein. ing. A seawater inlet pipe 16 for supplying seawater into the inner pipe 12 is provided at one axial end side (right side in FIG. 2) of the inner pipe 12, and the other axial end side of the inner pipe 12 (left side in FIG. 2) ) Is provided with a seawater outlet pipe 17 through which seawater is discharged from the inner pipe 12.

  The outer pipe 13 is provided coaxially with the inner pipe 12 at the radially outer side of the inner pipe 12 and is made of a metal material such as stainless steel or iron. A plurality of (three in the present embodiment) refrigerant inlet pipes 18 are provided in the lower part of the outer pipe 13, and a plurality of (two in the present embodiment) refrigerant outlet pipes 19 are provided in the upper part of the outer pipe 13. It is provided. The wall 13 a of the outer pipe 13 is provided with a nozzle for injecting a refrigerant for cooling the seawater in the inner pipe 12 in the annular space 14 between the outer pipe 13 and the inner pipe 12. The nozzle is provided in communication with the refrigerant inlet pipe 18.

  The blade mechanism 15 includes a rotating shaft 20, a support bar 21, a blade 22, and a motor 24, as shown in FIGS. The other axial end of the rotary shaft 20 is extended to the outside from a flange 23 provided at one axial end of the inner pipe 12 and connected to a motor 24 constituting a drive unit for driving the rotary shaft 20. Support bars 21 are erected on the circumferential surface of the rotating shaft 20 at predetermined intervals, and a blade 22 is attached to the tip of the support bar 21. The blade 22 is, for example, a strip-shaped member made of metal, and the side edge on the front side in the rotational direction is tapered.

  A temperature sensor (first sensor) T1 for detecting the temperature of seawater in the inlet portion of the double-pipe type ice making machine 1 is provided upstream of the seawater inlet pipe 16 of the double-pipe type ice making machine 1 in the seawater circulation path. A temperature sensor (second sensor) T2 is provided downstream of the seawater outlet pipe 17 of the double-tube type ice making machine 1 for detecting the temperature of seawater at the outlet of the double-tube type ice making machine 1 ing. Signals from these temperature sensors T1 and T2 are sent to a control unit (not shown) that controls the driving or operation of the compressor 2 of the ice making system A, the use side expansion valve 5, and the like.

  In the seawater circulation path, a bypass pipe 26 connecting a pipe P1 from the double-tube type ice making machine 1 to the storage tank 8 and a pipe P2 between the outlet 25 provided in the lower part of the storage tank 8 and the pump 9 Is provided. The bypass pipe 26 is provided with a motorized bypass valve 27 that opens and shuts off a path leading to the pump 9 via the bypass pipe 26.

  In the ice making system A according to the present embodiment, a portion of the seawater discharged from the double-tube type ice making machine 1 can be directly supplied to the double-tube type ice making machine 1 without returning to the seawater tank 8 . Thereby, the seawater containing the ice nucleus produced | generated in the double tube type ice making machine 1 can be efficiently supplied to a double tube type ice making machine, and the production | generation of the ice in the inner tube 12 can be promoted. .

  FIG. 4 is a view showing a change in inlet / outlet temperature of the double-tube type ice making machine in the conventional ice making system without the bypass pipe 26 as described above. In FIG. 4 and FIG. 5 mentioned later, the thick solid line indicates the temperature of seawater at the inlet portion of the double-tube ice maker, and the thin solid line indicates the temperature of seawater at the outlet portion of the double-tube ice maker. There is.

When starting the operation of the ice making system, both the inlet part temperature and the outlet part temperature start to fall. Sea water does not start freezing immediately after reaching freezing temperature, and is supercooled to below freezing temperature.
Then, when the subcooling progresses to a certain extent (t1), the subcooling is eliminated from the outlet portion of the double-tube type ice making machine having the lowest seawater temperature, and ice making starts from this outlet portion.

  The ice generated in the inner pipe of the double-tube type ice making machine is returned to the seawater tank, but since the seawater temperature in the seawater tank is still above the freezing temperature, the outlet provided at the lower part of the seawater tank The sea water supplied to the double-tube ice-making machine via a pump does not contain much ice nuclei.

  As the temperature of the seawater decreases, the position where the subcooling is eliminated moves from the outlet portion to the inlet portion of the double-tube type ice making machine. Then, the subcooling is eliminated at time t2 also at the inlet portion of the double-tube type ice making machine. The period from time t1 to time t2, ie, from the time the subcooling is canceled at the outlet of the double-tube ice machine to the time the subcooling is canceled at the inlet of the double-tube ice machine Since there is no ice nucleus in the inlet part, it is necessary to lower the refrigerant evaporation temperature to subcool the seawater when making ice, and if it is applied more than necessary, it may be iced instantly to form an ice lock. After the time point t2, since the ice nuclei flow into the inlet portion of the double-tube type ice making machine, the possibility of ice lock is reduced.

  As described above, in the conventional ice making system, it was difficult to stably produce ice, but in the ice making system A according to the present embodiment, seawater including ice nuclei generated after the start of operation is used as a double-tube type ice making machine Direct reversion can promote the formation of ice, and stable ice making can be performed.

  FIG. 5 is a diagram for explaining the open / close control of the bypass valve 27 in the ice making system A according to the present embodiment. The temperature sensor T1 and the temperature sensor T2 detect the temperatures of the inlet portion and the outlet portion of the double-tube type ice making machine 1, and the opening / closing of the bypass valve 27 is controlled based on these temperatures. The positions at which the temperature sensor T1 and the temperature sensor T2 are provided are detected by the temperature sensor T1 and the temperature sensor T2 although they are slightly apart from the inlet and the outlet of the inner pipe 12 of the double-tube type ice making machine 1 The temperature is considered to be substantially the same as the seawater temperature at the inlet and outlet of the inner pipe 12.

  At the start of operation of the ice making system A, the bypass valve 27 is in the “closed” state. Then, the bypass valve 27 switches to "open" at time t3 when the temperature of the seawater at the inlet portion of the double-pipe type ice making machine 1 becomes near the freezing temperature. The temperature difference ΔT0 between the inlet and outlet portions at this time (the detected temperature of the temperature sensor T1 and the detected temperature of the temperature sensor T2) is stored in the control unit. When the bypass valve 27 is opened, the ice generated by the double-tube type ice making machine 1 flows into the inlet portion of the double-tube type ice making machine 1, so the inlet portion of the double-tube type ice making machine 1 The rate of temperature decrease is faster than when the bypass valve 27 is closed. The timing of opening the bypass valve 27 was determined when the temperature detected by the temperature sensor T2 became the freezing temperature at the minimum concentration used when the concentration of seawater was unknown, and was measured when the concentration of seawater was known It can be when the freezing temperature at seawater concentration is reached. The minimum concentration used is the minimum value in the concentration range set by the local facility.

  Eventually, when the subcooling progresses to a certain extent (t4), the subcooling is eliminated from the outlet portion of the double-tube type ice making machine 1 with the lowest seawater temperature. While there is a possibility that an ice lock may be formed inside the inner pipe 12 for a short time (for example, about 1 to 2 seconds) after this time point t4, in the present embodiment, the bypass valve 27 is open. Because of this, ice nuclei flow into the inlet portion of the double-tube ice maker 1. As a result, ice making is stably performed after the short time. In the inlet portion of the double-tube type ice making machine 1, since ice nuclei flow in after the time point t3, ice making is started without undergoing supercooling.

  Then, a predetermined time (for example, 5 minutes) from time t5 when the value obtained by dividing the temperature difference .DELTA.T between the inlet portion and the outlet portion of the double-pipe type ice making machine 1 by 0.5. After the lapse of approximately 60 minutes, the bypass valve 27 is put in a "closed" state. After the predetermined time has elapsed, if the bypass valve continues to be opened, the ice in the double-tube type ice making machine 1 increases and ice accumulation tends to occur, and since ice is mixed in the inlet side flowing water, the ice making capacity is increased. Since it falls, the bypass valve 27 is closed, and all the seawater from the double-tube type ice making machine 1 is returned to the seawater tank 8.

  The timing at which the bypass valve 27 is closed and the condition "0.5 (.DELTA.T / .DELTA.T0)" which is the starting point of the timing may be adjusted according to the size of the seawater tank 8, the flow rate of seawater, etc. it can.

Second Embodiment
FIG. 6 is a schematic configuration diagram of an ice making system B according to another embodiment (second embodiment) of the present disclosure. The ice making system B according to the present embodiment is provided with a second outlet 28 of seawater above the seawater tank 8 instead of the bypass pipe in the ice making system A shown in FIGS. Therefore, elements or devices common to the ice making system A are given the same reference numerals, and for the sake of simplicity, the description thereof will be omitted.

  In the present embodiment, the second outlet 28 is provided in the upper part of the seawater tank 8 separately from the outlet 25 in the lower part of the seawater tank 8. When the operation of the ice making system B is started, ice is generated by the double-tube type ice making machine 1 and seawater including the ice is returned to the seawater tank 8. In the seawater tank 8, a large number of ice nuclei are normally present at the top. Therefore, by supplying seawater including many ice nuclei from the second outlet 28 to the double-tube type ice making machine 1 via the pump 9, as in the case of the first embodiment described above, ice is generated. Can be promoted. In this case, the timing of opening and closing of the valve 29 provided in the pipe from the second outlet 28 to the pump 9 is the inlet portion and the outlet of the double-pipe type ice making machine 1 detected by the first sensor T1 and the second sensor T2. It can set similarly to 1st Embodiment based on each temperature of a part.

Third Embodiment
FIG. 7 is a schematic configuration diagram of an ice making system C according to still another embodiment (third embodiment) of the present disclosure. The ice making system C according to the present embodiment is provided with a venturi tube 40 in a pipe P3 between the pump 9 and the ice making machine 1 instead of the bypass pipe in the ice making system A shown in FIGS. The bypass pipe 42 which connects the piping P1 which returns to the seawater tank 8 and the small diameter part 41 of the Venturi tube 40 is provided. Therefore, elements or devices common to the ice making system A are given the same reference numerals, and for the sake of simplicity, the description thereof will be omitted.

  In the present embodiment, a venturi pipe 40 is provided in a pipe P3 between the pump 9 and the ice making machine 1. Moreover, the bypass pipe 42 which connects the small diameter part 41 of this Venturi pipe | tube 40, and the piping P1 which returns from the ice making machine 1 to the seawater tank 8 is provided. The seawater supplied from the pump 9 to the ice making machine 1 passes through the venturi tube 40, but when passing through the small diameter portion 41 of the venturi tube 40, the flow velocity of the seawater increases, and the dynamic pressure of the seawater increases accordingly. On the other hand, the static pressure of the seawater passing through the small diameter portion 41 of the venturi tube 40 is reduced by the increase of the dynamic pressure. The bypass pipe 42 is connected to the small diameter portion 41, and a part of the medium to be cooled including the ice nuclei in the pipe P1 returning from the ice making machine 1 to the storage tank 8 using the reduced static pressure is supplied to the ice making machine 1 Supplying can promote the generation of ice inside the ice making machine 1. In this case, the opening and closing timing of the valve 43 provided in the bypass pipe 42 is based on the temperatures at the inlet and outlet of the double-pipe type ice making machine 1 detected by the first sensor T1 and the second sensor T2. The setting can be made in the same manner as in the first embodiment.

[Other Modifications]
The present disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims.
For example, in the embodiment described above, a so-called scraping-type double-tube type ice-making machine provided with an inner pipe and an outer pipe is illustrated as an ice-making machine that generates ice by cooling a medium to be cooled. The present disclosure can be applied to, for example, a supercooling type double-tube type ice making machine or a harvest type ice-making machine other than such a double-tube type ice making machine.

Moreover, in the embodiment described above, one double-tube ice maker is used in the ice making system, but two or more double-tube ice makers may be arranged in series or in parallel and used. .
Further, in the embodiment described above, although the horizontal double-tube ice-making machine is described as an example, the present disclosure can be applied to a vertical double-tube ice-making machine.

1: Double-tube ice maker (ice maker)
2: compressor 3: heat source side heat exchanger 4: four way switching valve 5: user side expansion valve 6: superheater 7: receiver 8: seawater tank 9: pump 10: blower fan 12: inner pipe 13: outer pipe 13a : Wall 14: annular space 15: blade mechanism 16: seawater inlet pipe 17: seawater outlet pipe 18: refrigerant inlet pipe 19: refrigerant outlet pipe 20: rotating shaft 21: support bar 22: blade 23: flange 24: motor 24: motor 25: outlet 26: bypass pipe 27: bypass valve 28: second outlet 29: valve 30: heat source side expansion valve 40: venturi pipe 41: small diameter portion 42: bypass pipe 43: valve A: ice making system B: ice making system C: ice making system T1 : Temperature sensor (first sensor)
T2: Temperature sensor (second sensor)
P1: Piping P2: Piping P3: Piping

Claims (5)

An ice making machine (1) that cools a medium to be cooled with a refrigerant to generate ice, a storage tank (8) that stores the medium to be cooled, and a pump (9) that supplies the medium to be cooled to the ice machine (1) And an ice making system (A) connected by piping,
The pipe (P1) from the ice making machine (1) to the storage tank (8), the pipe (P2) between the outlet (25) provided at the lower part of the storage tank (8) and the pump (9) An ice making system (A), having a bypass pipe (26) connecting.   A first sensor (T1) for detecting the temperature of the medium to be cooled at the inlet of the ice making machine (1), a second sensor (T2) for detecting the temperature of the medium to be cooled at the outlet of the ice making machine (1) And a bypass valve (27) provided in the bypass weir (26) and controlling the opening and closing of the bypass pipe (26) based on the temperatures detected by the first sensor (T1) and the second sensor (T2) An ice making system (A) according to claim 1, comprising.   The ice making machine (1) comprises an inner pipe (12) and an outer pipe (13) provided coaxially with the inner pipe (12) radially outside the inner pipe (12), A double pipe ice maker (1), wherein a medium to be cooled flows in the inner pipe (12) and a refrigerant flows in the space (14) between the inner pipe (12) and the outer pipe (13). An ice making system (A) according to claim 1 or claim 2. An ice making machine (1) for cooling a medium to be cooled with a refrigerant to generate ice, a storage tank (8) for storing the medium to be cooled and having an outlet (25) in the lower part, and the ice medium for the medium to be cooled An ice making system (B) in which a pump (9) supplying to (1) is connected by piping,
An ice making system (B) having a second outlet (28) at the top of the reservoir tank (8). An ice making machine (1) for cooling a medium to be cooled with a refrigerant to generate ice, a storage tank (8) for storing the medium to be cooled and having an outlet (25) in the lower part, and the ice medium for the medium to be cooled An ice making system (C) in which a pump (9) for supplying to (1) is connected by a pipe,
Connect the Venturi pipe provided on the pipe between the pump (9) and the ice making machine (1), the pipe from the ice making machine (1) to the storage tank (8), and the small diameter part of the Venturi pipe Ice making system (C) with bypass pipe.

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