KR102733132B1 - Ice slurry manufacturing device - Google Patents

Abstract

The present invention relates to an ice slurry manufacturing device capable of manufacturing a large quantity of ice slurry in a short period of time.
Its configuration includes a first cooler (2) that cools a first pipe (28) that supplies and guides a liquid that is a raw material for ice slurry by the pressure of a pump (P) to a first low-temperature state using a thermoelectric element (24); and
It includes a secondary refrigerator (5) that sprays and supplies liquid cooled in the first cooler (2) into the space (S) between the cylindrical frame (50) and the rotor (60) through the nozzle (72) of the second pipe (70), compresses, condenses, and expands the refrigerant circulating in the refrigerant pipe (81), and then causes the evaporator (85) surrounding the cylindrical frame (50) to evaporate and secondarily cool the temperature of the cylindrical frame (50) and the space (S) to below zero, thereby manufacturing the liquid sprayed into the space (S) into ice slurry and discharging it through the outlet (51) of the cylindrical frame (50).

Description

Ice slurry manufacturing device

The present invention relates to an ice slurry manufacturing device capable of rapidly cooling a liquid to manufacture ice slurry in a short period of time while in motion in a vehicle or at a site of use.

Ice slurry, which is made by freezing liquid, is a fluid that combines liquid and small ice chunks. It is used to store objects at low temperatures, or it is used for pipe cleaning by sending it inside a pipe to cool and separate contaminants attached to the pipe wall, and then moving and discharging them.

When ice slurry is used for pipe cleaning, since ice slurry is a flowing fluid, in order to increase the cleaning efficiency, a large amount that can fill about 20-30% of the corresponding cleaning section must be used, and it cannot be recycled once used. In addition, the cleaning sections must be designated consecutively and cleaned sequentially, but if the location where the cleaning is performed is an area with inconvenient transportation, such as a very narrow road, many vehicles cannot enter the cleaning area at the same time, making it difficult or impossible to transport the ice slurry. In addition, if an additional order is made due to a shortage of ice slurry during pipe cleaning, a lot of time is delayed, and since the ice slurry that was first put in during the summer melts quickly and disappears, more ice slurry must be put in than the amount initially put in, which makes the work cumbersome and costs a lot of money to clean the pipes.

To solve these problems, an ice slurry manufacturing device has recently been installed at an ice slurry inlet site, and ice slurry manufactured on site is injected into the pipes to clean the pipes. When large chunks of ice and salt prepared in advance in the ice slurry manufacturing device installed at the cleaning site are put into water and stirred with a stirrer, the large chunks of ice and salt melt and turn into salt water. As the salt melts, the freezing point of the salt water gradually decreases, so that the ice does not completely turn into water, but some of it remains in the form of small grains, enabling the production of ice slurry. The weight ratio of the ice chunks present in the ice slurry is determined depending on the amount of salt added in the above manufacturing process.

The above method for producing ice slurry has the problem that it takes a lot of time to produce ice slurry by putting large ice chunks and salt in water and melting them, so it is difficult to produce a lot of ice slurry in a short period of time. Therefore, it was impossible to avoid the realistic problem that the supply of ice slurry was delayed, which took a lot of time to clean the pipes, and thus increased labor costs.

The patent document regarding the conventional ice slurry manufacturing device is Republic of Korea Patent Publication No. 10-2011-0058066, which is an ice slurry supply system equipped with a stirring tank, published on June 1, 2011.

The above patent document is composed of an ice maker (100) that produces a heat medium as ice slurry, a heat storage tank (200) that stores the ice slurry produced in the ice maker (100), and a stirring tank (300) that mixes the ice slurry that is supplied directly from the ice maker (100) or stored in the heat storage tank (200) and then supplied to a cold storage demand source (10).

However, the above patent document manufactures ice slurry using an ice maker (100), but since it does not have a pre-cooling means for lowering the temperature before supplying the heat medium to the ice maker (100), there is a problem that it takes a long time for freezing and a large amount of ice slurry cannot be manufactured in a short period of time. In addition, since the manufactured ice slurry must be transported to a heat storage tank (200) through a pipe and stored separately, there is a problem that a place for installing the heat storage tank (200) must be secured, and when supplying it to a demander, the ice particles of the ice slurry supplied from the heat storage tank (200) must be stirred in a stirring tank (300) so that they are uniformly distributed, so there is a problem that the configuration is complicated.

Republic of Korea Publication Patent No. 10-2011-0058066

Accordingly, the present invention is intended to solve various problems of the conventional ice slurry manufacturing apparatus as described above, and the problem to be solved is to provide an ice slurry manufacturing apparatus capable of manufacturing a large amount of ice slurry in a short period of time by lowering the liquid, which is a raw material of ice slurry, to a low temperature state in a primary cooler and then supplying it to a secondary refrigerator equipped with a refrigeration system, so that ice slurry is naturally manufactured as it passes through the secondary refrigerator.

Another problem to be solved by the present invention is to provide an ice slurry manufacturing device in which, when liquid cooled to a low temperature in a primary refrigerator is sprayed into the space between the cylindrical frame and the rotor of a secondary refrigerator to manufacture ice slurry, even if it is supercooled and frozen, a spiral scraper mounted on the rotating rotor removes the frozen ice so that it does not interfere with the manufacture of a large amount of ice slurry in a short period of time.

Another problem to be solved by the present invention is to provide an ice slurry manufacturing device capable of manufacturing a large amount of ice slurry in a short period of time by suppressing loss of cold air by rotating a blower wheel mounted on the end of a rotor, thereby producing ice slurry and then expelling low-temperature cold air to the outside together with the ice slurry, and resupplying it to a space where liquid is sprayed.

Another problem to be solved by the present invention is to provide an ice slurry manufacturing device capable of manufacturing a large amount of ice slurry in a short period of time by collecting some of the liquid of the ice slurry during the process of manufacturing the ice slurry being discharged to the outside through a guide pipe connected to the outlet of a cylindrical frame and bypassing it to a primary cooler to lower the temperature supplied to the primary cooler.

The ice slurry manufacturing device of the present invention for achieving the above-mentioned problem comprises a primary cooler that cools a first pipe, which supplies and guides a liquid that is a raw material of ice slurry by the pressure of a pump, to a primary low-temperature state using a thermoelectric element; and

A secondary refrigerator is provided which sprays and supplies the liquid cooled in the first cooler into the space between the cylindrical frame and the rotor through the nozzle of the second pipe, compresses, condenses, and expands the refrigerant circulating in the refrigerant pipe, and then evaporates the refrigerant through the evaporator surrounding the cylindrical frame to cool the temperature of the cylindrical frame and the space below zero, thereby manufacturing the liquid sprayed into the space into ice slurry and discharging it through the outlet of the cylindrical frame.

Here, the first cooler is a first heat exchanger having a body made of a heat-conductive material through which a plurality of passages are penetrated, and a U-turn pipe is fixed to both ends of each adjacent passage so that the passages can form a single flow path, so that the liquid supplied through the first pipe by the pressure of the pump is guided to be discharged through the single flow path made of the passages and the U-turn pipe to the second pipe connected to the first pipe;

A thermoelectric element that is closely fixed to the body of the first heat exchanger and, when power is supplied, has one side of the closely fixed side as a cooling surface and the other side as a heat dissipation surface, and the closely fixed cooling surface cools the first heat exchanger to cool the liquid; and

A heat dissipation block is provided, which is fixed in close contact with the heat dissipation surface of the thermoelectric element, and a cooling pipe is connected to the heat exchange room so that the cooling water can be repeatedly circulated through the heat exchange room where the cooling fins are accommodated, so that the cooling water circulating through the cooling pipe is cooled when it passes through the heat exchange room after being cooled outside the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element in close contact therewith;

The above secondary refrigerator is a cylindrical frame made of a heat-conductive material and having an ice slurry discharge port formed at the bottom;

A rotating body that is rotatably accommodated inside the cylindrical frame so as to have a space between the cylindrical frame and the cylindrical frame in which ice slurry can be manufactured, and that rotates by driving the motor, and has a spiral scraper wound on the outer surface so as to remove ice slurry frozen on the inner wall of the cylindrical frame;

A second pipe connected to the first pipe for supplying liquid so as to supply liquid as a raw material of ice slurry into the space between the cylindrical frame and the rotating body, and equipped with a plurality of nozzles at the bottom for supplying liquid into the space; and

A refrigeration system in which a compressor, a condenser, an expansion valve, and an evaporator are sequentially mounted on a path of a refrigerant pipe through which refrigerant circulates, and the evaporator is arranged to be wound in multiple turns on the outer surface of a cylindrical frame, so that the compressor compresses the circulating refrigerant to high temperature and high pressure, the condenser condenses the refrigerant into a supercooled liquid, the expansion valve expands the high temperature and high pressure liquid refrigerant supplied from the condenser into a low temperature and low pressure state so that it can easily evaporate, and the evaporator evaporates the expanded refrigerant and absorbs heat around the cylindrical frame it surrounds, thereby secondarily cooling the temperature of the cylindrical frame and a space to below zero.

The primary cooler of the present invention comprises a second heat exchanger in which a portion of the first pipe is inserted into the interior of the storage chamber so as to be immersed in a liquid heat storage medium filled in the storage chamber of the housing;

A thermoelectric element that is tightly fixed to the housing of the second heat exchanger and, when power is supplied, has one side of the tightly fixed side as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the housing and the heat storage medium, thereby cooling the liquid flowing through the first pipe; and

A heat dissipation block is included, which is fixed in close contact with the heat dissipation surface of the thermoelectric element, and has a cooling pipe connected to the heat exchange room so that cooling water can be repeatedly circulated through the heat exchange room where the cooling fins are accommodated, so that the cooling water circulating through the cooling pipe is cooled outside the heat exchange room and then cooled when passing through the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element in close contact therewith.

The present invention further includes a first air-cooling cooling means being mounted on the path of the cooling pipe of the heat dissipation block,

Here, the first air-cooling cooling means is a cooling block in which a heat exchange room is connected in communication with the cooling pipe so that cooling water circulating through the cooling pipe can enter and exit the internal heat exchange room having cooling fins;

A thermoelectric element that is tightly fixed to the cooling block and, when power is supplied, has one side that is tightly fixed as a cooling surface and the other side that is tightly fixed as a heat dissipation surface, and the tightly fixed cooling surface cools the cooling water flowing through the cooling block;

A heat sink that is closely fixed to the heat dissipation surface of the thermoelectric element and cools the heat dissipation surface of the thermoelectric element; and

It includes a blower fan installed on one side separated from the heat sink and rotated by driving a motor to force air to the heat sink to cool the heat sink.

The rotor of the present invention is cooled to below zero by an evaporator, and a blower wheel is mounted on the shaft end of the motor so that cold air in a space where ice slurry is manufactured is not discharged together with the ice slurry through the outlet of the cylindrical frame when it is discharged, but moves to the upper part of the cylindrical frame and is supplied back into the space.

The scraper of the present invention has holes through which liquid supplied from a nozzle and small ice particles frozen by cooling in an evaporator can pass.

The second pipe of the present invention comprises a section in a curved shape in which a nozzle is installed to supply liquid flowing inside the pipe to the space between the cylindrical frame and the rotating body, so as to correspond to the space, and a second air-cooling means is further installed in the section path.

Here, the second air-cooling cooling means is a cool block assembled so that a body made of a heat-conductive material surrounds the second pipe;

A thermoelectric element that is closely fixed to the cool block and, when power is supplied, has one side that is closely fixed as a cooling surface and the other side that is closely fixed as a heat dissipation surface, so that the closely fixed cooling surface cools the cool block and cools the liquid flowing through the second pipe;

A heat sink that is closely fixed to the heat dissipation surface of the thermoelectric element and cools the heat dissipation surface of the thermoelectric element; and

It includes a blower fan installed on one side separated from the heat sink and rotated by driving a motor to force air to the heat sink to cool the heat sink.

The present invention comprises a guide pipe having a hole formed through the bottom for collecting a portion of unfrozen liquid of ice slurry discharged through an outlet of a cylindrical frame, a collection tank equipped with a cooling liquid discharged below the hole, and connected to the outlet of the cylindrical frame, and a first pipe and the collection tank are connected to a bypass pipe equipped with a pump so that the cooling liquid collected in the collection tank can be supplied to a first heat exchanger.

The present invention, configured as described above, first cools liquid, which is a raw material for ice slurry, to a low temperature so that it does not freeze in a primary cooler, and then sprays the liquid into the space between the cylindrical frame and the rotating body of a secondary refrigerator having a refrigeration system including an evaporator. As the liquid particles pass through the space, some of them freeze in the form of small granules, and the rest do not freeze but remain in a liquid phase, and the frozen granules and liquid phase are discharged through the outlet in a mixed state, so that a large amount of ice slurry can be manufactured in a short period of time.

In addition, the present invention has an advantage in that when producing ice slurry by injecting liquid into the space between the cylindrical frame and the rotor of a secondary refrigerator, even if the liquid is supercooled and frozen, the spiral scraper mounted on the rotating rotor removes the frozen ice, so the produced ice slurry only has a high ice ratio and does not affect the production of a large amount of ice slurry in a short period of time.

In addition, the present invention has an advantage in that, when cold air, which is supplied by cooling the liquid by an evaporator while located in a space and freezes to produce ice slurry, moves to be discharged through an outlet together with the ice slurry, a blower wheel mounted on the end of a rotor rotates to pressurize and send the low-temperature cold air being discharged to the upper part of a cylindrical frame and re-supply it to the space where the liquid is sprayed, thereby reducing the load on the evaporator and continuously lowering the temperature of the space, so that a large amount of ice slurry can be produced in a short period of time.

In addition, the present invention has an advantage in that, during the process in which the manufactured ice slurry is discharged to the outside through a guide tube connected to the outlet of the cylindrical frame, the unfrozen liquid contained in the ice slurry is collected and bypassed to the primary cooler, thereby lowering the temperature supplied to the primary cooler, thereby reducing the load on the thermoelectric element, and making it possible to manufacture a large amount of ice slurry in a short period of time.

Figure 1 is a conceptual diagram showing an example of an ice slurry manufacturing device of the present invention.
Figure 2 is a conceptual diagram showing another embodiment of an ice slurry manufacturing device of the present invention.
Figure 3 is a plan view showing a primary cooler equipped with the first heat exchanger of the present invention.
Figure 4 is an enlarged perspective view showing the upper part of the first heat exchanger of the present invention.
Figure 5 is an enlarged detailed view of the thermoelectric element mounting state of the first heat exchanger of the present invention.
Figure 6 is a front view showing the rotating body of the secondary refrigerator of the present invention.
Figure 7 is a detailed, enlarged cross-sectional view of the spiral scraper of the present invention.
Figure 8 is a conceptual diagram showing the nozzle arrangement state mounted on the second pipe of the present invention.
Figure 9 is a cross-sectional view showing a second air-cooling cooling means mounted on a second pipe of the present invention.
Figure 10 is an enlarged detailed view of the ice water storage room on the upper part of the rotating body of the present invention.
Figure 11 is an enlarged view of the liquid collected in the collection tank of the present invention being supplied to the first pipe through a bypass pipe.

Hereinafter, the configuration of an ice slurry manufacturing device according to the present invention will be described in detail with reference to the attached drawings.

As shown in the drawing above, the ice slurry manufacturing device (1) of the present invention comprises a first cooler (2) that cools a first pipe (28) that supplies and guides a liquid that is a raw material for ice slurry by the pressure of a pump (P) to a first low-temperature state using a thermoelectric element (24); and

It includes a secondary refrigerator (5) that sprays and supplies liquid cooled in the first cooler (2) into the space (S) between the cylindrical frame (50) and the rotor (60) through the nozzle (72) of the second pipe (70), compresses, condenses, and expands the refrigerant circulating in the refrigerant pipe (81), and then causes the evaporator (85) surrounding the cylindrical frame (50) to evaporate and secondarily cool the temperature of the cylindrical frame (50) and the space (S) to below zero, thereby manufacturing the liquid sprayed into the space (S) into ice slurry and discharging it through the outlet (51) of the cylindrical frame (50).

For reference, the liquid that is the raw material of the ice slurry of the present invention contains salt that lowers the freezing point. Since the freezing point is lowered more as the amount of salt, which is a freezing point depressant, is contained, an appropriate amount of salt should be used. The liquid of the present invention may contain 2 to 5% salt. Since the liquid contains salt, when passing through the space (S) of the secondary refrigerator (5), some of the liquid freezes in the form of small grains and the remainder does not freeze but exists in a liquid phase, so that an ice slurry can be produced.

The above primary cooler (2) first cools the liquid, which is the raw material for the ice slurry, to a low temperature before supplying it to the secondary cooler (5), so that when the liquid is made into ice slurry in the secondary cooler (5), the liquid freezes in a short period of time, thereby enabling the production of a large amount of ice slurry in a short period of time.

This primary cooler (2) is configured to cool the liquid using a thermoelectric element (24) in order to reduce the volume. More specifically, one embodiment of the configuration of the primary cooler (2) is as shown in Fig. 1, in which a plurality of passages (22) are formed through a body (21) made of a heat-conductive material, and a U-turn pipe (23) is fixed to both ends of each of the adjacent passages (22) so that the passages (22) can form a single flow path, and the liquid supplied through the first pipe (28) by the pressure of the pump (P) is guided to be discharged to the second pipe (70) connected to the first pipe (28) through the single flow path formed by the passages (22) and the U-turn pipe (23).

A thermoelectric element (24) that is tightly fixed to the body (21) of the first heat exchanger (20) and, when power is supplied, has one side of the tightly fixed element as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the first heat exchanger (20) and cools the liquid; and

It includes a heat dissipation block (27) that is fixed in close contact with the heat dissipation surface of the thermoelectric element (24) and is connected to a heat exchange room through a cooling pipe (26) so that the cooling water can be repeatedly circulated through the heat exchange room in which the cooling fins (25) are accommodated, so that the cooling water circulating through the cooling pipe (26) is cooled outside the heat exchange room and then cooled when it passes through the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element (24) that is in close contact therewith.

The first heat exchanger (20) above has a plurality of passages (22) penetrating the body (21) as shown in FIGS. 1, 3, and 5, which are connected by a U-turn pipe (23) to form a single flow path, so that the single flow path through which the liquid flows exists in the body (21) except for the U-turn pipe (23), so that the liquid can be efficiently cooled without heat loss. The body material of the first heat exchanger (20) can be a metal material with good thermal conductivity, such as silver, copper, aluminum, magnesium, etc. Among these, copper has excellent thermal conductivity and can cool the liquid in a short time, and aluminum is recommended because it is inexpensive, easy to purchase, and has good thermal conductivity. A first pipe (28) is connected to the inlet and outlet of the above single euro to supply liquid, and a pump (P) is mounted on the path of the first pipe (28) to continuously supply liquid, and a flange (29) is provided at the end to enable connection to a second pipe (70).

The thermoelectric element (24) that cools the first heat exchanger (20) has a characteristic that when power is supplied, one side becomes a cooling surface and the other side becomes a heat dissipation surface. The cooling surface is in close contact with the first heat exchanger (20) through which liquid flows to cool the liquid, and the heat dissipation surface is in close contact with the heat dissipation block (27) to cool it. The temperature difference between the cooling surface and the heat dissipation surface of the thermoelectric element (24) theoretically reaches about 70°C. For example, if the temperature of the heat dissipation surface is assumed to be 0°C, the temperature of the cooling surface is about -70°C, and if the temperature of the heat dissipation surface is assumed to be 20°C, the temperature of the cooling surface is about -50°C. If an object having a higher temperature than the cooling surface is attached to the cooling surface and cooled, that is, if a load is applied, the cooling surface loses cooling heat to the object and its temperature rises, thereby cooling the object. The heat dissipation surface generates more heat and its temperature rises compared to before the load, so the heat dissipation surface must be cooled using an air-cooled or water-cooled cooling device. Ultimately, the lower the temperature of the heat dissipation surface of the thermoelectric element (24), the lower the temperature of the cooling surface, which gradually lowers the cooling efficiency.

The above-described radiator block (27) can adopt a water-cooling type and an air-cooling type, and the present invention adopts a water-cooling type with better cooling efficiency. The water-cooling radiator block (27) of the present invention has cooling fins (25) accommodated in the heat exchange room so that the cooling water passing through the internal heat exchange room moves in a turbulent state and evenly transfers its own cold heat to the radiator block (27) to enhance the cooling performance of the radiator block (27), and a cooling pipe (26) is connected to the heat exchange room so that the cooling water can circulate. Therefore, the cooling water circulating through the cooling pipe (26) by the driving of the pump (P-1) is cooled outside the radiator block (27), and then when it passes through the heat exchange room of the radiator block (27), the cold heat is taken away, thereby cooling the radiator block (27), and after being discharged in a heated state from the radiator block (27), it is cooled outside and moves back to the radiator block (27) to continuously cool the radiator block (27).

The present invention enables the cooling performance of the heat dissipation block (27) to be improved by further installing a first air-cooling means (30) in the path of the cooling pipe (26) so as to further lower the temperature of the cooling water circulating through the cooling pipe (26).

The first air-cooling cooling means (30) above includes a cooling block (31) in which a heat exchange room is connected in communication with the cooling pipe (26) so that the cooling water circulating through the cooling pipe (26) can enter and exit the internal heat exchange room having cooling fins (31a);

A thermoelectric element (32) that is tightly fixed to the cooling block (31) and, when power is supplied, has one side that is tightly fixed as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the cooling water flowing through the cooling block (31);

A heat sink (33) that is closely fixed to the heat dissipation surface of the thermoelectric element (32) and cools the heat dissipation surface of the thermoelectric element (32); and

It includes a blower fan (34) installed on one side separated from the heat sink (33) and rotated by the drive of a motor (M) to force air to the heat sink (33) to cool the heat sink (33).

The first air-cooled cooling means (30) configured in this manner has a cooling block (31) connected to a cooling pipe (26) of a first heat exchanger (20) through which cooling water flows, and a cooling surface of a thermoelectric element (32) is in close contact with the cooling block (31) to cool the cooling block (31). Accordingly, the cooling water cooled by the cooling block (31) circulates through the heat dissipation block (27) and cools the heat dissipation surface of the thermoelectric element (24) of the first heat exchanger (20) in close contact with the heat dissipation block (27), thereby increasing the cooling efficiency of the heat dissipation block (27).

As the cooling performance of the heat dissipation block (27) is improved by the first air-cooling cooling means (30), the temperature of the heat dissipation surface of the thermoelectric element (24) in close contact with the heat dissipation block (27) is lowered accordingly, so that more heat of the cooling surface of the thermoelectric element (24) is transferred to the heat dissipation surface, and thus the temperature of the cooling surface is lowered accordingly. Accordingly, as the temperature of the cooling surface of the thermoelectric element (24) is lowered, the first heat exchanger (20) in close contact with the cooling surface can be cooled to a lower temperature, and thus the temperature of the liquid flowing through the single flow path of the first heat exchanger (20) is lowered further.

Meanwhile, another embodiment of the primary cooler (2) is a second heat exchanger (40) in which a part of the first pipe (28) is inserted into the storage chamber so as to be immersed in a liquid heat storage medium (42) filled in the storage chamber of the housing (41) as shown in Fig. 2;

A thermoelectric element (43) that is tightly fixed to the housing (41) of the second heat exchanger (40) and, when power is supplied, has one side of the tightly fixed element as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the housing (41) and the heat storage medium (42) to cool the liquid flowing through the first pipe (28); and

It includes a heat dissipation block (46) that is fixed in close contact with the heat dissipation surface of the thermoelectric element (43) and is connected to a heat exchange room through a cooling pipe (45) so that the cooling water can be repeatedly circulated through the heat exchange room in which the cooling fins (44) are accommodated, so that the cooling water circulating through the cooling pipe (45) is cooled outside the heat exchange room and then cooled when it passes through the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element (43) that is in close contact therewith.

Here, the thermoelectric element (43) and the heat dissipation block (46) are similar to those described above, so their descriptions have already been described in detail, and thus further detailed descriptions will be omitted. In addition, the first air-cooling cooling means (30) mounted on the cooling pipe (45) path of the heat dissipation block (46) has also been described in detail above, and thus further detailed descriptions will be omitted.

The second heat exchanger (40) above is provided with a sealed storage room inside the housing (41) as shown in Fig. 2, and the storage room is filled with a heat storage medium (42). The material of the housing (41) can be a metal material with good thermal conductivity, such as silver, copper, aluminum, magnesium, etc. Among them, copper has excellent thermal conductivity and can cool liquid in a short time, and aluminum is recommended because it is inexpensive, easy to purchase, and has good thermal conductivity.

The above-mentioned heat storage medium (42) is cooled by the thermoelectric element (43) so that it is in a state of constantly accumulating low-temperature cold heat, and since it is in a liquid state, it cools the first pipe (28) area immersed in it, thereby removing the heat of the liquid flowing inside the first pipe (28) and cooling it. Therefore, if the second heat exchanger (40) is powered in advance before producing the ice slurry and cools the heat storage medium (42) using the thermoelectric element (43), the liquid can be cooled immediately, thereby increasing the cooling efficiency.

It is preferable that the portion of the first pipe (28) accommodated in the storage chamber of the housing (41) is piped in a zigzag manner so as to secure a wide contact area with the cooled heat storage medium (42).

The primary cooler (2) configured as described above has the components, including the first and second heat exchangers (20) (40), the first pipe (28), the thermoelectric element (24) (43), and the heat dissipation block (27) (46), coated with insulating material (not shown) to prevent heat exchange with the outside.

The liquid cooled by the above primary cooler (2) must be supplied to the secondary refrigerator (5), so it is desirable to cool it to the lowest temperature that does not freeze. In this way, the liquid supplied from the secondary refrigerator (5) can be cooled to produce a large amount of ice slurry in a short period of time.

The above secondary refrigerator (5) further cools the low-temperature liquid supplied from the primary cooler (2) using a known refrigeration system (80) consisting of a compressor (82), a condenser (83), an expansion valve (84), and an evaporator (85) to produce ice slurry.

The secondary refrigerator (5) consists of a cylindrical frame (50) made of a heat-conductive material and having an outlet (51) formed at the bottom to guide the discharge of ice slurry;

A rotating body (60) that is rotatably accommodated inside the cylindrical frame (50) so as to have a space (S) between the cylindrical frame (50) and the cylindrical frame (50) in which ice slurry can be manufactured, and rotates by driving a motor (61), and has a spiral scraper (63) wound around the outer surface so as to remove ice slurry frozen on the inner wall of the cylindrical frame (50);

A second pipe (70) connected to the first pipe (28) for supplying liquid so that the liquid, which is a raw material of ice slurry, can be supplied to the space (S) between the cylindrical frame (50) and the rotating body (60), and equipped with a plurality of nozzles (72) at the bottom for supplying the liquid to the space (S); and

A refrigeration system (80) is provided, in which a compressor (82), a condenser (83), an expansion valve (84), and an evaporator (85) are sequentially mounted on a path of a refrigerant pipe (81) through which refrigerant circulates, and the evaporator (85) is arranged to be wound in multiple turns on the outer surface of a cylindrical frame (50), so that the compressor (82) compresses the circulating refrigerant to high temperature and high pressure, the condenser (83) condenses the refrigerant into a supercooled liquid, the expansion valve (84) expands the high temperature and high pressure liquid refrigerant supplied from the condenser (83) into a low temperature and low pressure state so that it can easily evaporate, and the evaporator (85) evaporates the expanded refrigerant to absorb heat around the cylindrical frame (50) that it surrounds, thereby secondarily cooling the temperature of the cylindrical frame (50) and a space (S) to below zero.

The above cylindrical frame (50) is configured in a hollow shape so as to accommodate a rotating body (60) therein, and an outlet (51) through which ice slurry is discharged is formed at the bottom. The cylindrical frame (50) has an evaporator (85) wound multiple times on its outer surface so that it can be cooled by an evaporator (85) of a refrigeration system (80). In order to be cooled in a short period of time by the evaporator (85), the material of the cylindrical frame (50) can be a metal material with good thermal conductivity, such as silver, copper, aluminum, magnesium, etc. Among these, copper has excellent thermal conductivity and can cool liquid in a short period of time, and aluminum is recommended because it is inexpensive, easy to purchase, and has good thermal conductivity. The cylindrical frame (50) is coated with an insulating material (52) so as to block heat exchange with the outside, thereby increasing cooling efficiency.

The above-described rotating body (60) is rotatably accommodated inside a cylindrical frame (50) and is fixed to a shaft (62) of a motor (61). The outer diameter of the rotating body (60) is formed narrower than the inner diameter of the cylindrical frame (50) so that a space (S) is formed between the cylindrical frame (50) and the rotating body (60) to which liquid can be supplied. It is preferable that the rotating body (60) be made of a metal material having good thermal conductivity so that it can be cooled by radiant heat of the cylindrical frame (50) so that the liquid supplied to the space (S) can be cooled. In addition, the rotating body (60) is fixed so that a spiral scraper (63) is wound around the outer circumference so that ice slurry frozen on the inner wall of the cylindrical frame (50) can be removed. The above spiral scraper (63) is a type of ice remover that removes frozen ice that may narrow the space (S) for manufacturing ice slurry while impeding the movement of low-temperature radiation heat of the cylindrical frame (50) that is transferred to the space (S) by freezing on the wall surface of the cylindrical frame (50), unlike the conventional method of scraping solid ice into small pieces to directly create ice that constitutes ice slurry. Therefore, the scraper (63) has a different purpose and function from the conventional scrapers that scrape ice to create ice that constitutes ice slurry, and therefore, it is judged that its progressiveness from the conventional scrapers should not be denied. That is, according to the present invention, some of the small liquid particles injected into the space (S) through the nozzle (72) are frozen into small granules in the space (S) and mostly fall vertically together with the remaining unfrozen liquid particles, so that almost no freezing occurs on the cylindrical frame (50) and the rotating body (60) forming the space (S). Therefore, the scraper (63) occasionally removes ice frozen on the cylindrical frame (50) and the rotating body (60) when producing ice slurry for a long period of time.

The above scraper (63) has a hole (63a) through which liquid supplied from a nozzle (72) and small ice particles frozen by cooling of an evaporator (85) can pass, as shown in FIGS. 6 and 7.

In addition, the above-mentioned rotor (60) is cooled to below zero by the evaporator (85) so that the cold air in the space (S) where ice slurry is manufactured is not discharged together with the ice slurry through the outlet (51) of the cylindrical frame (50) when it is discharged, but moves to the upper part of the cylindrical frame (50) and is supplied back to the space (S). A blower wheel (84) is mounted on the end of the shaft (62) of the motor (61).

It is preferable that the above-mentioned rotating body (60) and the shaft be connected by a reinforcing member (65) so that the rotating body (60) can firmly fix the shaft (62) of the motor (61).

The second pipe (70) is connected to the first pipe (28) so that liquid can be supplied from the first pipe (28). Accordingly, the second pipe (70) is formed with a flange (71) for pipe connection at the tip, and is equipped with a plurality of nozzles (72) that supply the liquid supplied to the lower portion into the space (S) between the cylindrical frame (50) and the rotating body (60). It is preferable that the section of the second pipe (70) where the nozzles (72) are equipped be configured in a curved shape corresponding to the space (S).

Meanwhile, the second pipe (70) is further equipped with a second air-cooling means (90) along the path as shown in Fig. 9 so that even if heat loss occurs in the liquid during the process of transporting the liquid, the heat can be recovered and the liquid can be supplied to the secondary refrigerator (5) at the lowest temperature without freezing.

The above second air-cooling means (90) is a cool block (93) assembled so that a body made of a heat-conductive material surrounds the second pipe (70) (30);

A thermoelectric element (94) that is tightly fixed to the cool block (93) and, when power is supplied, has one side that is tightly fixed as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the cool block (93) and cools the liquid flowing through the second pipe (70);

A heat sink (95) that is closely fixed to the heat dissipation surface of the thermoelectric element (94) and cools the heat dissipation surface of the thermoelectric element (94); and

It includes a blower fan (96) installed on one side separated from the heat sink (95) and rotated by driving a motor (M) to force air to the heat sink (95) to cool the heat sink.

The above-mentioned cool block (93) can be made of a metal material with good thermal conductivity, such as copper or aluminum, so that the cold heat of the cooling surface of the thermoelectric element (94) can be quickly transferred to the second pipe (70). Copper has good thermal conductivity and can cool the liquid in a short period of time, and aluminum is recommended because it is inexpensive, easy to purchase, and has good thermal conductivity.

Since the above cool block (93) must be fixed in a state of wrapping around the second pipe (70), the separated first and second pieces (91) (92) are fastened and fixed by bolts, and the second pipe (70) is received in a close surface contact state at the contact portion of the first and second pieces (91) (92).

The above cool block (93) and thermoelectric element (94) are wrapped with insulating material (97) to prevent heat loss from occurring due to heat exchange with the outside.

The thermoelectric element (94) with the cooling surface fixed in close contact with the cool block (93), the heat sink (95) in close contact with the heat dissipation surface of the thermoelectric element (94), and the blower fan (96) that cools the heat sink (95) have the same functions as those described above, so a detailed description will be omitted.

The above second air-cooling means (90) cools the liquid flowing through the second pipe (70) to maintain the lowest temperature at which it will not freeze until just before it is sprayed from the nozzle (72) into the space (S), thereby helping the refrigeration system (80) to produce a large amount of ice slurry in a short period of time from the sprayed liquid.

The above refrigeration system (80) is a known technology widely used in the industrial field for cooling, in which a compressor (82), a condenser (83), an expansion valve (84), and an evaporator (85) are sequentially installed on the path of a refrigerant pipe (81) through which a refrigerant circulates in order to freeze some of the liquid sprayed from the nozzle (72) into small ice particles and make an ice slurry. The evaporator (85) is arranged to be wound in multiple turns on the outer surface of a cylindrical frame (50), so that the refrigerant flowing inside evaporates and absorbs heat from the cylindrical frame (50) and its surroundings, thereby cooling the temperature of the cylindrical frame (50) to below zero. That is, the compressor (82) compresses the refrigerant at high temperature and high pressure so that it can be easily condensed and liquefied, and sends it to the condenser (83), whereupon the condenser (83) condenses the refrigerant into a supercooled liquid and sends it to the expansion valve (84). The expansion valve (84) expands the high-temperature, high-pressure liquid refrigerant supplied from the condenser (83) into an atomized state to lower the temperature, facilitate evaporation, and sends it to the evaporator (85), whereupon the evaporator (85) evaporates the expanded refrigerant. As the evaporated refrigerant evaporates, it absorbs heat from the surroundings, so it absorbs the heat of the air existing in the cylindrical frame (50) that it surrounds and its surroundings, that is, the space (S), and cools it. Accordingly, the liquid particles sprayed into the space (S) through the nozzle (72) are secondarily cooled by evaporation of the refrigerant as they pass through the cooled space (S), so that some of them freeze into small ice grains, and the rest do not freeze but remain as liquid and become ice slurry together with the frozen ice grains, which are discharged through the outlet of the cylindrical frame (50).

Here, the liquid particles sprayed into the space (S) become ice slurry while passing through the space (S) in a state where small ice grains and unfrozen liquid are mixed. The weight ratio of the small ice grains and the liquid phase can be set to, for example, 10 to 40%: 90 to 60%. This setting is possible by controlling the concentration of salt mixed in the liquid and the spray amount of liquid supplied to the space (S). If the salt content, which lowers the freezing point at the same temperature, is large, the freezing point of the liquid is lowered, so that the amount of small ice grains among the liquid particles that are frozen when passing through the space (S) is reduced, and an ice slurry having a larger amount of unfrozen liquid phase can be manufactured. On the other hand, if the salt content is reduced, the freezing point is increased, so that the liquid particles are easily frozen, so that an ice slurry having a larger amount of small ice grains and a smaller amount of liquid phase can be manufactured.

Alternatively, the weight ratio of ice grains to liquid phase can be controlled by controlling the amount of liquid sprayed from the nozzle (72). At the same salt concentration, if the amount of liquid sprayed is greater, the amount of liquid phase is greater than the amount of ice grains, and if the amount of liquid sprayed is less, the amount of ice grains is greater.

Meanwhile, the present invention winds a heating wire (100) as a heating means around the outer surface of a cylindrical frame (50), and when ice has formed on the inner wall of the cylindrical frame (50) and needs to be removed, power is supplied to the heating wire (100) so that the cylindrical frame (50) is heated, thereby quickly melting and removing the ice formed on the inner wall.

In addition, in case ice is frozen on the inner wall of the cylindrical frame (50) and needs to be removed, as shown in FIG. 10, a melt water storage room (110) having a discharge port (111) is provided on the upper part of the rotating body (60), and when melt water (120) is supplied to the melt water storage room (110) through a hose (H) and the rotating body (60) is rotated, the supplied melt water (120) is discharged through the discharge port (111), and the discharged melt water (120) is evenly supplied to the ice frozen on the inner wall of the cylindrical frame (50) by the centrifugal force of the rotating body (60), so that the ice can be simply thawed and removed by hot water.

Meanwhile, the present invention collects a portion of the liquid of the ice slurry produced and discharged from the secondary refrigerator (5) and bypasses it to the first heat exchanger (20) or the second heat exchanger (40), thereby lowering the temperature of the liquid supplied to the first heat exchanger (20) or the second heat exchanger (40), thereby reducing the load on the thermoelectric element (24) (43).

Specifically, a guide pipe (130) having a hole (131) formed through the bottom for collecting a portion of the unfrozen liquid of the ice slurry produced in the secondary refrigerator (5) and discharged through the outlet (51) of the cylindrical frame (50) and equipped with a collection tank (132) for collecting the cooling liquid discharged below the hole (131) is connected to the outlet (51) of the cylindrical frame (50), and the first pipe (28) and the collection tank (132) are connected to a bypass pipe (133) equipped with a pump (P-2) so that the cooling liquid collected in the collection tank (132) can be supplied to the first heat exchanger (20).

The liquid mixed in the ice slurry discharged through the above guide pipe (130) flows through the guide pipe (130) and some of it is collected in the collection tank (132) through the hole (131), and the collected liquid moves to the first pipe (28) by the pressure of the pump (P-2) to lower the temperature of the liquid flowing through the first pipe (28) and is supplied to the first heat exchanger (20) or the second heat exchanger (40).

Accordingly, the temperature of the liquid supplied to the first and second heat exchangers (20)(40) is lowered, so the load on the thermoelectric element (24)(43) is reduced by the amount of the lowered temperature, so that the life of the thermoelectric element (24)(43) can be extended, and since the temperature of the liquid is lowered more quickly, it is possible to stably supply ice slurry in a short period of time.

Meanwhile, the present invention supplies compressed air to the space (S) through the nozzle (72) of the second pipe (70) so as to melt ice frozen on the cylindrical frame (50) and the rotor (60). The third pipe (141) connected to the compressor (140) that compresses air is connected to the second pipe (70), and the first and second valves (142) (143) are mounted on the second pipe (70) and the third pipe (141), so that when the compressed air is supplied to the space (S), the first valve (142) is closed and the second valve (143) is opened, so that the compressed air is supplied to the space (S). At this time, the polarity of the power supplied to the thermoelectric element (94) of the second air-cooling cooling means (90) is reversed to change the cooling surface to the heat-radiating surface and the heat-radiating surface to the cooling surface when producing the ice slurry. Then, since the heat dissipation surface of the thermoelectric element (94) heats the cool block (93), the compressed air flowing through the second pipe (70) is injected into the space (S) in a heated state to melt the ice. After melting the ice, the first valve (142) is opened and the second valve (143) is closed to block the supply of the compressed air to the second pipe (70), and also, if the polarity of the thermoelectric element (94) is restored to its original state, the ice slurry can be manufactured again.

The present invention, which is configured as described above, first cools the liquid which is the raw material of the slurry in a primary cooler and then cools it a second time in a secondary refrigerator and sprays it into the space between the cylindrical frame and the rotor, thereby producing a large amount of ice slurry in a short period of time at a pipe cleaning site, thereby enabling quick and simple pipe cleaning; when producing the ice slurry, even if the liquid is supercooled and frozen, the rotating spiral scraper can remove the frozen ice; the blower wheel mounted on the end of the rotor pressurizes the low-temperature cold air being discharged together with the ice slurry upward and resupplied back into the space, thereby increasing the cooling efficiency and enabling the production of a large amount of ice slurry in a short period of time; and when the ice slurry is discharged, a portion of the liquid which is not frozen is collected and bypassed to the primary cooler, thereby lowering the temperature supplied to the primary cooler, thereby reducing the load on the thermoelectric element, while also enabling the production of a large amount of ice slurry in a short period of time, so that it is an invention with advancement.

1: Ice slurry manufacturing device 2: Primary cooler
5: Secondary refrigeration unit 20: First heat exchanger
23: U-turn tube 24: Thermoelectric element
25: Heat dissipation block 28: 1st pipe
30: First air-cooling cooling means 31: Cooling block
32: Thermoelectric element 33: Heat sink
34: Blower fan 40: Second heat exchanger
41: Housing 42: Heat storage medium
43: Thermoelectric element 45: Cooling pipe
46: Heat dissipation block 50: Cylindrical frame
60: Rotating body 63: Scraper
64: Blower wheel 70: Second pipe
72 : Nozzle 80 : Refrigeration system
85: Evaporator 90: Second air-cooled cooling means
93: Cool Block 110: Thawing Water Storage Room
132: Collection bin 133: Bypass pipe
140 : Compressor S : Space

Claims (7)

A primary cooler (2) that cools the first pipe (28) that supplies and guides the liquid that becomes the raw material of the ice slurry by the pressure of the pump (P) to a primary low-temperature state using a thermoelectric element (24); and
A secondary refrigerator (5) is provided, which sprays and supplies the liquid cooled in the first cooler (2) into the space (S) between the cylindrical frame (50) and the rotor (60) through the nozzle (72) of the second pipe (70), compresses, condenses, and expands the refrigerant circulating in the refrigerant pipe (81), and then evaporates the refrigerant through the evaporator (85) surrounding the cylindrical frame (50) to cool the temperature of the cylindrical frame (50) and the space (S) to below zero, thereby manufacturing the liquid sprayed into the space (S) into ice slurry and discharging it through the outlet (51) of the cylindrical frame (50).
Here, the primary cooler (2) is a first heat exchanger (20) having a plurality of passages (22) penetrating a body (21) made of a heat-conductive material, and a U-turn pipe (23) fixed to both ends of each adjacent passage (22) so that the passages (22) can form a single flow path, so that the liquid supplied through the first pipe (28) by the pressure of the pump (P) is guided to be discharged through the single flow path made of the passages (22) and the U-turn pipe (23) to the second pipe (70) connected to the first pipe (28);
A thermoelectric element (24) that is tightly fixed to the body (21) of the first heat exchanger (20) and, when power is supplied, has one side of the tightly fixed element as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the first heat exchanger (20) and cools the liquid; and
A heat dissipation block (27) is included, which is fixed in close contact with the heat dissipation surface of the thermoelectric element (24), and a cooling pipe (26) is connected to the heat exchange room so that the cooling water can be repeatedly circulated through the heat exchange room where the cooling fins (25) are accommodated, so that the cooling water circulating through the cooling pipe (26) is cooled outside the heat exchange room and then cooled when passing through the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element (24) in close contact therewith.
The above secondary refrigerator (5) is composed of a heat conductive material and is a cylindrical frame (50) having an ice slurry discharge port (51) formed at the bottom;
A rotating body (60) that is rotatably accommodated inside the cylindrical frame (50) so as to have a space (S) between the cylindrical frame (50) and the cylindrical frame (50) in which ice slurry can be manufactured, and rotates by driving a motor (61), and has a spiral scraper (63) wound around the outer surface so as to remove ice slurry frozen on the inner wall of the cylindrical frame (50);
A second pipe (70) connected to the first pipe (28) for supplying liquid so that the liquid, which is a raw material of ice slurry, can be supplied to the space (S) between the cylindrical frame (50) and the rotating body (60), and equipped with a plurality of nozzles (72) at the bottom for supplying the liquid to the space (S); and
A refrigeration system (80) in which a compressor (82), a condenser (83), an expansion valve (84) and an evaporator (85) are sequentially mounted on a path of a refrigerant pipe (81) through which refrigerant circulates, and the evaporator (85) is arranged to be wound in multiple turns on the outer surface of a cylindrical frame (50), so that the compressor (82) compresses the circulating refrigerant to high temperature and high pressure, the condenser (83) condenses the refrigerant into a supercooled liquid, the expansion valve (84) expands the high temperature and high pressure liquid refrigerant supplied from the condenser (83) into a low temperature and low pressure state so that it can easily evaporate, and the evaporator (85) evaporates the expanded refrigerant to absorb heat around the cylindrical frame (50) that it surrounds, thereby secondarily cooling the temperature of the cylindrical frame (50) and the space (S) to below zero;
Including that a first air-cooling cooling means (30) is further mounted on the path of the cooling pipe (26) of the above heat dissipation block (27),
Here, the first air-cooling cooling means (30) is a cooling block (31) in which a heat exchange room is connected to the cooling pipe (26) so that the cooling water circulating through the cooling pipe (26) can enter and exit the internal heat exchange room having cooling fins (31a);
A thermoelectric element (32) that is tightly fixed to the cooling block (31) and, when power is supplied, has one side that is tightly fixed as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the cooling water flowing through the cooling block (31);
A heat sink (33) that is closely fixed to the heat dissipation surface of the thermoelectric element (32) and cools the heat dissipation surface of the thermoelectric element (32); and
An ice slurry manufacturing device characterized by including a blower fan (34) installed on one side separated from the heat sink (33) and rotating by driving a motor (M) to force air to the heat sink (33) to cool the heat sink (33).
In claim 1, the first cooler (2) is a second heat exchanger (40) in which a part of the first pipe (28) is inserted into the storage chamber so as to be immersed in a liquid heat storage medium (42) filled in the storage chamber of the housing (41);
A thermoelectric element (43) that is tightly fixed to the housing (41) of the second heat exchanger (40) and, when power is supplied, has one side of the tightly fixed element as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the housing (41) and the heat storage medium (42) to cool the liquid flowing through the first pipe (28); and
An ice slurry manufacturing device characterized by including a heat dissipation block (46) that is fixed in close contact with the heat dissipation surface of the thermoelectric element (43) and is connected to a heat exchange room through a cooling pipe (45) so that the cooling water can be repeatedly circulated through the heat exchange room in which the cooling fins (22) are accommodated, so that the cooling water circulating through the cooling pipe (45) is cooled when it passes through the heat exchange room after being cooled outside the heat exchange room, thereby cooling the heat dissipation surface of the thermoelectric element (43) that is in close contact therewith.
delete In claim 1, the rotating body (60) is cooled to below zero by the evaporator (85) so that when the ice slurry is discharged, the cold air in the space (S) where the ice slurry is manufactured is not discharged through the outlet (51) of the cylindrical frame (50) together with the ice slurry, but moves to the upper part of the cylindrical frame (50) and is supplied back to the space (S), and is characterized in that a blower wheel (64) is mounted on the end of the shaft (62) of the motor (61).
In claim 1, an ice slurry manufacturing device characterized in that the scraper (63) has a hole (63a) through which liquid supplied from a nozzle (72) and small ice particles frozen by cooling of an evaporator (85) can pass.
In claim 1, the second pipe (70) is configured in a curved shape with a section in which a nozzle (72) is installed to spray and supply liquid flowing inside into the space (S) between the cylindrical frame (50) and the rotating body (60) so as to correspond to the space (S), and a second air-cooling means (90) is further installed in the section path.
Here, the second air-cooling cooling means (90) is a cool block (93) assembled so that a body made of a heat-conductive material surrounds the second pipe (70);
A thermoelectric element (94) that is tightly fixed to the cool block (93) and, when power is supplied, has one side that is tightly fixed as a cooling surface and the other side as a heat dissipation surface, so that the tightly fixed cooling surface cools the cool block (93) and cools the liquid flowing through the second pipe (70);
A heat sink (95) that is closely fixed to the heat dissipation surface of the thermoelectric element (94) and cools the heat dissipation surface of the thermoelectric element (94); and
An ice slurry manufacturing device characterized by including a blower fan (96) installed on one side separated from the heat sink (95) and rotating by driving a motor (M) to force air to the heat sink (95) to cool the heat sink (95).
An ice slurry manufacturing device according to claim 1, characterized in that a hole (131) for collecting a portion of the unfrozen liquid of the ice slurry discharged through the outlet (51) of the cylindrical frame (50) is formed through the bottom, a guide pipe (130) equipped with a collection tank (132) for collecting the cooling liquid discharged below the hole (131) is connected to the outlet (51) of the cylindrical frame (50), and the first pipe (28) and the collection tank (132) are connected to a bypass pipe (133) equipped with a pump (P-2) so that the cooling liquid collected in the collection tank (132) can be supplied to the first heat exchanger (20).

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