JP6384997B2 - Herringbone coil ice making equipment - Google Patents

Description

  The present invention relates to a herringbone coil ice making device for making ice cubes.

  The ice making device includes an ice making tank filled with a brine such as an aqueous calcium chloride solution. This ice making tank is provided with an ice making region and a heat exchange region, and brine is circulated at a predetermined flow rate (for example, 1 m / second) with an agitator. A herringbone coil is installed in the heat exchange zone to cool the brine to about −10 ° C. In the ice making area, ice cans filled with fresh water are immersed in brine, and the fresh water in the ice cans is frozen for about 24 hours to produce ice cubes.

  A herringbone coil is shown in “Chapter 2 Ice Making Device” of Non-Patent Document 1. As shown in FIG. 5, the herringbone coil cooling pipe 60 of the herringbone coil described in Non-Patent Document 1 is a refrigerant having one end connected to the surge drum 61 and the other end extending along the bottom surface in the ice making tank. A liquid pipe 62, and a refrigerant liquid gas pipe 63 disposed above the refrigerant liquid pipe 62 and extending along the refrigerant liquid pipe 62, having one end connected to the surge drum 61 and the other end extending through the ice making tank. In between, it is connected to the mirror image of “ku”. A plurality of herringbone coil cooling pipes 60 are arranged with a predetermined interval between the refrigerant liquid pipe 62 and the refrigerant liquid gas pipe 63. The refrigerant liquid supplied from the surge drum 61 evaporates while flowing through the refrigerant liquid pipe 62 → the herringbone coil cooling pipe 60 → the refrigerant liquid gas pipe 63, cools the brine flowing in the ice making tank, and returns to the surge drum 61.

“Refrigeration and Air Conditioning Handbook, Refrigeration Application Equipment”, Japan Refrigeration Association, June 25, 1993, 5th edition, volume 4, pages 53-59

  In this conventional herringbone coil, the refrigerant liquid supplied from the high-pressure liquid receiver constituting the refrigeration cycle to the surge drum flows in a natural circulation. Therefore, it takes the form of a “<” character mirror image in consideration of the supply of the refrigerant liquid and the recovery of the refrigerant gas generated in the herringbone coil.

  The herringbone coil cooling pipe close to the surge drum side and the herringbone coil cooling pipe separated from the surge drum have different flow path lengths from the surge drum to the herringbone coil cooling pipe and back to the surge drum. For this reason, in the herringbone coil cooling pipe having a long flow path length, when the refrigerant gas evaporated by heat exchange with the brine returns to the surge drum, the refrigerant returns from the herringbone coil cooling pipe with a short flow path length. There is a possibility that the brine is blocked by the gas and hinders the return to the surge drum and the brine cannot be sufficiently cooled. The herringbone coil cooling tube needs to have a horizontally long "<" shape mirror image as much as possible.

  The herringbone coil is obliquely inserted and welded to a refrigerant liquid pipe and a refrigerant liquid gas pipe extending from the surge drum into the ice making tank. For this reason, the holes drilled in the refrigerant liquid pipe and the refrigerant liquid gas pipe have an elliptical shape and require skillful techniques for processing and welding operations. If the welding quality deteriorates, refrigerant leakage may occur from the welding location due to a pinhole or the like.

  In view of the problems of the prior art, the present invention realizes a herringbone ice making device that eliminates troublesome processing, eliminates the risk of refrigerant leakage, and further increases the cooling efficiency of brine in the herringbone coil ice making device. The purpose is to do.

The herringbone ice making device of the present invention is
It has a CO2 secondary refrigerant type refrigeration system in which NH3 is used as a primary refrigerant, CO2 is used as a secondary refrigerant, and an NH3 circulation channel and a CO2 circulation channel are connected by a cascade capacitor. A herringbone coil ice making device for passing a CO2 secondary refrigerant through
The pipeline is
A CO2 refrigerant liquid supply pipe that extends linearly and through which the CO2 secondary refrigerant flows;
A herringbone coil liquid header pipe extending along the CO2 refrigerant liquid supply pipe, communicating with the downstream end of the CO2 refrigerant liquid supply pipe and extending upstream of the CO2 refrigerant liquid supply pipe;
A herringbone coil liquid gas header pipe extending along the herringbone coil liquid header pipe above the herringbone coil liquid header pipe;
A herringbone coil cooling pipe having one end connected to the herringbone coil liquid header pipe and the other end connected to the herringbone coil liquid gas header pipe,
A plurality of the herringbone coil cooling is provided between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe with a predetermined interval in a direction in which the herringbone coil liquid header pipe extends,
In the plurality of herringbone coil cooling pipes, the CO2 refrigerant flows in from an inflow end of the herringbone coil liquid header pipe and passes through each of the plurality of herringbone coil cooling pipes. It is configured to be connected between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe so that the respective flow path lengths from the discharge end to the discharge end are aligned. .

  According to the above herringbone ice making device, the plurality of herringbone coil cooling pipes are configured such that the CO2 refrigerant flows in from the inflow end of the herringbone coil liquid header pipe and passes through each of the plurality of herringbone coil cooling pipes. It is connected between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe so that the respective flow path lengths from the discharge end of the liquid gas header pipe to each other are made uniform. Therefore, the herringbone coil cooling pipe provided on the upstream side of the herringbone coil liquid header pipe among the plurality of herringbone coil liquid cooling pipes connected to the herringbone coil liquid header pipe is the herringbone coil liquid header. Although the flow path length from the upstream end of the pipe to the herringbone coil cooling pipe is short, the flow path length from the herringbone coil cooling pipe to the downstream end of the herringbone coil liquid gas header pipe becomes long. In addition, the herringbone coil cooling pipe provided on the downstream side of the herringbone coil liquid header pipe among the plurality of herringbone coil liquid cooling pipes connected to the herringbone coil liquid header pipe is a herringbone coil liquid header pipe. Although the flow path from the upstream end to the herringbone coil cooling pipe is long, the flow path length from the herringbone coil cooling pipe to the downstream end of the herringbone coil liquid gas header pipe becomes short. In other words, each of the plurality of herringbone coil cooling pipes has a flow path length from the inflow side end of the herringbone coil liquid header pipe to the discharge side end of the herringbone coil liquid gas header pipe through the herringbone coil cooling pipe. Can be aligned. Therefore, when this flow path length is set to a length that allows the CO2 refrigerant to evaporate by the heat exchange between the CO2 refrigerant and the medium to be cooled to cool the medium to be cooled, the CO2 refrigerant flowing through all the herringbone coil cooling pipes. Thus, the medium to be cooled can be cooled. Therefore, the cooling efficiency of the medium to be cooled can be increased as compared with the case where the flow path lengths of the CO 2 refrigerant flowing through each of the plurality of herringbone coil cooling pipes are different.

In some embodiments,
The herringbone coil cooling pipe extends from the downstream side to the upstream side of the herringbone coil liquid header pipe, bends upward, and extends from the upstream side to the downstream side of the herringbone coil liquid header pipe. It is configured.

  In this case, the herringbone coil cooling pipe extends from the downstream side to the upstream side of the herringbone coil liquid header pipe, bends upward, and extends from the upstream side to the downstream side of the herringbone coil liquid gas header pipe. Since it is comprised, the area which a herringbone coil cooling pipe contacts with a brine can be increased. For this reason, the cooling efficiency of a to-be-cooled medium can be improved more. Further, since the downstream side of the herringbone coil cooling gas pipe extends from the upstream side to the downstream side of the herringbone coil liquid gas header pipe, the flow direction of the CO2 refrigerant flowing through the herringbone coil liquid gas header pipe And have the same direction component. For this reason, the inflow of the CO2 refrigerant from the herringbone coil cooling pipe to the herringbone coil liquid gas header pipe can be made smoother, and the cooling efficiency of the CO2 refrigerant can be further increased.

In some embodiments,
A lower end portion of the herringbone coil liquid cooling pipe is connected to the herringbone coil liquid header pipe in a state of being orthogonal to a direction in which the herringbone coil liquid header pipe extends, and the herringbone coil cooling pipe is An upper end portion of the pipe is connected to the herringbone coil liquid gas header pipe in a state in which the upper end portion faces a direction orthogonal to the extending direction of the herringbone coil liquid gas header pipe.

  In this case, the lower end of the herringbone coil cooling pipe is connected to the herringbone coil liquid header pipe in a state of being orthogonal to the extending direction of the herringbone coil liquid header pipe. Since the upper end of the tube is connected to the herringbone coil liquid gas header pipe in a direction orthogonal to the extending direction of the herringbone coil liquid gas header pipe, the herringbone coil cooling pipe is connected to the herringbone coil The opening provided for connection to the liquid header pipe or the herringbone coil liquid gas header pipe can have the same shape as the end shape of the herringbone coil cooling pipe. For this reason, for example, when the end shape of the herringbone coil cooling pipe is circular, the shape of the opening provided in the herringbone coil liquid header pipe or the herringbone coil liquid gas header pipe can be circular, Processing for forming the opening can be facilitated. Also, when welding the end of the herringbone coil cooling pipe to the opening, the welding line can be made circular in the outer shape of the end of the herringbone coil cooling pipe, facilitating the welding operation. Can do.

In some embodiments,
A pair of herringbone coil liquid header tubes are provided,
A CO2 refrigerant liquid branch header pipe communicating between one end of the pair of herringbone coil liquid header pipes and one end of the CO2 refrigerant liquid supply pipe is provided;
A CO2 refrigerant liquid header bypass pipe that communicates between the other ends of the pair of herringbone coil liquid header pipes is provided.

  In this case, since the other end portions of the pair of herringbone coil liquid header pipes communicate with each other via the CO2 refrigerant liquid header bypass pipe, the CO2 refrigerant liquid to the pair of herringbone coil liquid header pipes is evenly distributed. Can be diverted.

  According to at least some embodiments of the present invention, it is possible to provide a herringbone coil ice making device that can further improve the cooling efficiency of brine in an ice making device having a herringbone coil cooling pipe.

1 is a schematic configuration diagram of a herringbone coil ice making device according to an embodiment of the present invention. It is a schematic block diagram in the planar view of the ice making tank of a herringbone coil ice making apparatus. FIG. 2A is a schematic perspective view of the herringbone coil, and FIG. 2B is a schematic configuration diagram of the herringbone coil in a rear view. FIG. 4A is a plan view of the herringbone coil partially omitted, FIG. 4B is a side view of the herringbone coil, and FIG. 4C is a bottom view of the herringbone coil partially omitted. It is. It is a schematic block diagram of the conventional herringbone coil.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a herringbone coil ice making device of the present invention will be described with reference to FIGS. It should be noted that the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.

  FIG. 1 is a schematic configuration diagram of a herringbone coil ice making device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram in plan view of an ice making tank of the herringbone coil ice making device.

  FIG. 1 shows an ice making device 1 including an ice making tank 10, a refrigeration device 20, and herringbone coils 40a and 40b. FIG. 2 shows an ice making tank 10.

  The ice making tank 10 is formed in a bottomed container shape, and is formed in a rectangular shape in plan view. A pair of partition walls 11 a and 11 b are provided in the center of the ice making tank 10 so as to extend in the longitudinal direction of the ice making tank 10 and to be disposed at a predetermined interval in the short direction of the ice making tank 10. Yes. The ice making areas 12a and 12b and the heat exchange area 13 are partitioned by the pair of partition walls 11a and 11b. The ice making tank 10 is filled with, for example, a brine 2 made of an aqueous calcium chloride solution, and the agitator 14 disposed at one end in the longitudinal direction of the ice making tank 10 is used in the direction of arrow a between the ice making areas 12a and 12b and the heat exchange area 13. In addition, for example, a circulating flow that circulates at a flow rate of about 1 m / s is formed.

  The brine 2 is cooled to about −10 ° C. by the CO 2 refrigerant in the heat exchange area 13. In the ice making regions 12a and 12b, a large number of ice making cans 3 filled with fresh water are immersed in the brine 2, and the fresh water is cooled by the brine 2, and transparent ice cubes are produced over a period of about 24 hours. .

  The refrigeration apparatus 20 constitutes an NH3 refrigeration cycle in which an NH3 circulation channel 21 and a CO2 circulation channel 23 using CO2 as a secondary refrigerant are connected by a cascade capacitor 25. A compressor 27, a condenser 29, an expansion valve 31, and a cascade capacitor 25 are interposed in the NH 3 circulation channel 21. The NH 3 refrigerant used as the primary refrigerant condenses and vaporizes the CO 2 refrigerant used as the secondary refrigerant in the cascade condenser 25. The CO 2 refrigerant is cooled and liquefied and dropped into the CO 2 liquid reservoir 33.

  As the CO2 refrigerant, CO2 gas is sent from the CO2 liquid reservoir 33 to the cascade condenser 25, and the CO2 liquid liquefied by the cascade condenser 25 returns to the CO2 liquid reservoir 33. The CO2 refrigerant liquid stored in the CO2 liquid reservoir 33 is supplied by the CO2 liquid pump 34 to the herringbone coils 40a and 40b in the heat exchange area 13 through the CO2 circulation channel 35a, and exchanges heat with the brine 2. , Return to the CO2 reservoir 33 through the CO2 circulation channel 35b.

  Next, the herringbone coils 40a and 40b will be described. 4A is a plan view of the herringbone coil partially omitted, FIG. 4B is a side view of the herringbone coil, and FIG. 4C is a bottom view of the herringbone coil partially omitted. FIG. Herringbone coils 40a and 40b are disposed in the heat exchange area 13 between the pair of partition walls 11a and 11b. In the heat exchange zone 13, a long and narrow brine flow path is formed, and two herringbone coils 40a and 40b are arranged from the upstream side to the downstream side along the flow direction a of the brine. Since the two herringbone coils 40a and 40b have the same configuration, the herringbone coil 40a will be described.

  The herringbone coil 40 a extends along the longitudinal direction of the heat exchange zone 13 and is disposed below the liquid level L of the brine 2. The herringbone coil 40a communicates with the CO2 circulation flow path 35a of the refrigeration apparatus 20, as shown in FIGS. 1, 3A, 4A, 4B, and 4C. A CO2 refrigerant liquid supply pipe 41 extending along the bottom surface of the ice making tank 10 and a CO2 refrigerant liquid supply pipe arranged at predetermined intervals on both sides of the CO2 refrigerant liquid supply pipe 41 in the short direction. 41 and a pair of herringbone coil liquid header pipes 43a and 43b that communicate with the downstream end of the CO2 refrigerant liquid supply pipe 41 and above the pair of herringbone coil liquid header pipes 43a and 43b, respectively. A pair of herringbone coil liquid gas header pipes 47a, 47b disposed along the herringbone coil liquid header pipes 43a, 43b and one end connected to the herringbone coil liquid header pipes 43a, 43b Comprising Re other end herringbone coil liquid gas header pipe 47a, a plurality of herringbone coil cooling tube 49 connected to 47b, a.

  The downstream ends of the pair of herringbone coil liquid header tubes 43a, 43b communicate with the CO2 refrigerant liquid branch header tube 44a, and the upstream ends of the pair of herringbone coil liquid header tubes 43a, 43b are CO2. It communicates with the refrigerant liquid header bypass pipe 44b. For this reason, the CO2 liquid refrigerant flowing through the CO2 refrigerant liquid supply pipe 41 flows into the pair of herringbone coil liquid header pipes 43a and 43b through the CO2 refrigerant liquid branch header pipe 44a and enters the herringbone coil liquid header pipes 43a and 43b. Flows in the downstream direction.

  On the other hand, the downstream end portions of the pair of herringbone coil liquid gas header tubes 47a and 47b are closed, and the upstream end portions of the pair of herringbone coil liquid gas header tubes 47a and 47b are liquid gas collecting header tubes. 45. Therefore, the CO 2 gas refrigerant flowing into the herringbone coil liquid gas header pipes 47a and 47b from the plurality of herringbone coil cooling pipes 49 is upstream of the herringbone coil liquid gas header pipes 47a and 47b (liquid gas collecting header pipe 45). To the CO2 circulation flow path 35b.

  The herringbone coil cooling pipe 49 has a predetermined interval between the herringbone coil liquid header pipes 43a and 43b and the herringbone coil liquid gas header pipes 47a and 47b in the extending direction of the herringbone coil liquid header pipes 43a and 43b. A plurality are provided. The herringbone coil cooling pipe 49 extends from the upstream side to the downstream side of the herringbone coil liquid header pipes 43a and 43b and bends upward to extend from the downstream side to the upstream side of the ringbone coil liquid header pipes 47a and 47b. It is configured as follows.

  Unlike the conventional herringbone coil in which the refrigerant is supplied from the surge drum by natural circulation, the herringbone coils 40a and 40b are supplied by the CO2 liquid pump 34 by forced circulation. For this reason, the herringbone coil cooling pipe 49 constituting the herringbone coils 40a and 40b is connected to the header pipe in a mirror image of the "<" shape in consideration of the fluidity of the refrigerant supply like the conventional herringbone coil. do not have to.

  Therefore, as shown in FIGS. 3A and 3B, the lower end portion of the herringbone coil cooling pipe 49 is perpendicular to the direction in which the herringbone coil liquid header pipes 43a and 43b extend (vertical). The upper end of the herringbone coil cooling pipe 49 is orthogonal to the extending direction of the herringbone coil liquid gas header pipes 47a and 47b. Are connected to the herringbone coil liquid gas header pipes 47a and 47b in a state of facing in the vertical direction (vertically downward).

  Therefore, when the end shape of the herringbone coil cooling pipe 49 is circular, for example, the herringbone coil cooling pipe 49 is connected to the herringbone coil liquid header pipes 43a and 43b and the herringbone coil liquid gas header pipes 47a and 47b. The shape of the opening provided for connection to can be made circular. Accordingly, processing for forming the opening can be facilitated. Further, when the end of the herringbone coil cooling pipe 49 is welded to the opening, the weld line can be made the same shape as the outer peripheral shape (for example, circular) of the end of the herringbone coil cooling pipe 49, When the outer peripheral shape of the end portion of the herringbone coil cooling pipe 49 is an easy shape such as a circle, welding work can be facilitated.

  When the CO2 refrigerant liquid is supplied to the CO2 refrigerant liquid supply pipe 41 of the herringbone coil 40a configured as described above, the CO2 refrigerant liquid flows from the upstream side to the downstream side of the CO2 refrigerant liquid supply pipe 41, and the CO2 refrigerant liquid is supplied. It flows through the diverter header pipe 44a, flows through the herringbone coil liquid header pipes 43a, 43b from the downstream side to the upstream side, and flows through the repetitive herringbone coil cooling pipe 49 to the herringbone coil liquid gas header pipe 47a. , 47 b, flows from the downstream side of the herringbone coil liquid gas header pipes 47 a, 47 b toward the upstream side, and flows into the liquid gas assembly header pipe 45.

  Therefore, the herringbone coil cooling pipe 49a provided on the upstream side of the herringbone coil header pipes 43a and 43b among the plurality of herringbone coil cooling pipes 49 connected to the herringbone coil liquid header pipes 43a and 43b. Is supplied from the herringbone coil liquid header pipes 43a and 43b and has a short flow path length La to the herringbone coil cooling pipe 49a, but flows out of the herringbone coil cooling pipe 49a and flows into the herringbone coil liquid gas header pipe 47b. The flow path length Lb to the downstream end of the is long. Further, among the plurality of herringbone coil cooling pipes 49 connected to the herringbone coil liquid header pipes 43a, 43b, a herringbone coil cooling pipe 49b provided on the downstream side of the herringbone coil liquid header pipes 43a, 43b is The flow path length Lc supplied from the herringbone coil liquid header pipes 43a and 43b to the herringbone coil cooling pipe 49b is increased, but flows out from the herringbone coil cooling pipe 49b and flows into the herringbone coil liquid gas header pipe 47a. The flow path length Ld to the downstream end of the is long.

  That is, in any of the plurality of herringbone coil cooling pipes 49, the refrigerant liquid is introduced from the inflow side ends of the herringbone coil liquid header pipes 43a and 43b, and the discharge side ends of the herringbone coil liquid gas header pipes 47a and 47b. The channel length to the part can be made substantially the same length. Therefore, when the flow path length is set to a length that allows the CO2 refrigerant liquid to evaporate by the heat exchange between the CO2 refrigerant liquid and the brine to cool the brine 2, the CO2 refrigerant flowing through all the herringbone coil cooling pipes 49. Can cool the brine 2. Therefore, the cooling efficiency of the brine 2 can be increased as compared with the case where the flow path lengths of the CO2 refrigerant flowing through each of the plurality of herringbone coil cooling pipes 49 are different.

1 Herringbone coil ice making equipment 2 Brine (cooled refrigerant)
3 Ice Making Can 10 Ice Making Tank 11a, 11b Partition Wall 12a, 12b Ice Making Area 13a, 13b Heat Exchange Area 14 Agitator 20 Refrigeration Equipment 21 NH ₃ Circulation Channel 23, 35a, 35b CO2 Circulation Channel 25 Cascade Capacitor 27 Compressor 29 Condensation 31 Expansion valve 33 CO2 reservoir (refrigeration cycle component)
34 CO2 liquid pump (refrigeration cycle components)
40a, 40b Herringbone coil 41 CO2 refrigerant liquid supply pipe 43a, 43b Herringbone coil liquid header pipe 44a CO2 refrigerant liquid branch header pipe 44b CO2 refrigerant liquid header bypass pipe 45 Liquid gas assembly header pipe 47a, 47b Herringbone coil Liquid gas header pipe 49, 60 Herringbone coil cooling pipe 61 Surge drum 62 Refrigerant liquid pipe 63 Refrigerant liquid gas pipe L Liquid level

Claims (3)

It has a CO2 secondary refrigerant type refrigeration system in which NH3 is used as a primary refrigerant, CO2 is used as a secondary refrigerant, and an NH3 circulation channel and a CO2 circulation channel are connected by a cascade capacitor. a herringbone coil ice making device for flow through the CO 2 refrigerant as the secondary refrigerant through,
The pipeline is
A CO2 refrigerant liquid supply pipe that extends linearly and through which the CO2 secondary refrigerant flows;
A herringbone coil liquid header pipe extending along the CO2 refrigerant liquid supply pipe, communicating with the downstream end of the CO2 refrigerant liquid supply pipe and extending upstream of the CO2 refrigerant liquid supply pipe;
A herringbone coil liquid gas header pipe extending along the herringbone coil liquid header pipe above the herringbone coil liquid header pipe;
A herringbone coil cooling pipe having one end connected to the herringbone coil liquid header pipe and the other end connected to the herringbone coil liquid gas header pipe,
A plurality of the herringbone coil cooling pipes are provided between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe with a predetermined interval in a direction in which the herringbone coil liquid header pipe extends,
In the plurality of herringbone coil cooling pipes, the CO2 refrigerant flows in from an inflow end of the herringbone coil liquid header pipe and passes through each of the plurality of herringbone coil cooling pipes. It is connected between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe so that the respective flow path lengths from the discharge end to the discharge end are aligned ,
The herringbone coil cooling pipe extends from the downstream side to the upstream side of the herringbone coil liquid header pipe and bends upward to extend from the upstream side to the downstream side of the herringbone coil liquid gas header pipe. herringbone coil ice making apparatus characterized by being. It has a CO2 secondary refrigerant type refrigeration system in which NH3 is used as a primary refrigerant, CO2 is used as a secondary refrigerant, and an NH3 circulation channel and a CO2 circulation channel are connected by a cascade capacitor. A herringbone coil ice making device for passing a CO2 refrigerant as the secondary refrigerant through
The pipeline is
A CO2 refrigerant liquid supply pipe that extends linearly and through which the CO2 secondary refrigerant flows;
A herringbone coil liquid header pipe extending along the CO2 refrigerant liquid supply pipe, communicating with the downstream end of the CO2 refrigerant liquid supply pipe and extending upstream of the CO2 refrigerant liquid supply pipe;
A herringbone coil liquid gas header pipe extending along the herringbone coil liquid header pipe above the herringbone coil liquid header pipe;
A herringbone coil cooling pipe having one end connected to the herringbone coil liquid header pipe and the other end connected to the herringbone coil liquid gas header pipe,
A plurality of the herringbone coil cooling pipes are provided between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe with a predetermined interval in a direction in which the herringbone coil liquid header pipe extends,
In the plurality of herringbone coil cooling pipes, the CO2 refrigerant flows in from an inflow end of the herringbone coil liquid header pipe and passes through each of the plurality of herringbone coil cooling pipes. It is connected between the herringbone coil liquid header pipe and the herringbone coil liquid gas header pipe so that the respective flow path lengths from the discharge end to the discharge end are aligned,
A pair of herringbone coil liquid header tubes are provided,
  A CO2 refrigerant liquid branch header pipe communicating between one end of the pair of herringbone coil liquid header pipes and one end of the CO2 refrigerant liquid supply pipe is provided;
  A CO2 refrigerant liquid header bypass pipe that communicates between the other ends of the pair of herringbone coil liquid header pipes is provided.
Herringbone coil ice making device. The lower end of the herringbone coil cooling tube, wherein in a state facing the direction orthogonal to the direction of extension of the herringbone coil liquid header pipe is connected to the herringbone coil liquid header pipe, said herringbone coil cooling tube The upper end portion is connected to the herringbone coil liquid gas header pipe in a state in which the upper end portion faces in a direction orthogonal to the extending direction of the herringbone coil liquid gas header pipe. The herringbone coil ice making device described.

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