JP3193441U - Fish carp system with nitrogen water converter - Google Patents

Abstract

The present invention provides a low cost fish carp system for maintaining the freshness of fish by reducing the dissolved oxygen content of water in the fish carp and increasing the amount of dissolved nitrogen.
In a fish carp system comprising a fish carp 6 and a cooling means, it is installed outside the fish carp to reduce the dissolved oxygen content of the passing water and increase the dissolved nitrogen content to convert it into nitrogen water. A nitrogen water conversion device 3 and water circulation means for extracting water from the fish carp and circulating it through the nitrogen water conversion device and returning it to the fish carp. The nitrogen water conversion device extracts nitrogen gas from the atmosphere. And a nitrogen gas injector 33 for injecting the extracted nitrogen gas into the water passing through. The cooling means is installed outside the fish carp, and the water circulation means cools the water taken out from the fish carp through the cooling means before passing through the nitrogen water conversion device by heat exchange. When the cooling means is installed inside the fish carp, the water circulation means passes the water in the fish carp through the cooling means and cools it by heat exchange, and then removes it from the fish carp.
[Selection] Figure 1

Description

  The present invention relates to a fish rod system provided in a fishing boat for storing freshly caught fish in cold water.

  The fishing boat is equipped with a fish rod for storing freshly caught fish in cold water. Actually, it is configured as a system including a fish tank as a water tank and a cooler for cooling water (seawater) in the fish tank. For example, Patent Literatures 1 to 4 disclose a cooling device for fish salmon.

  The coolers described in Patent Documents 1 to 3 circulate the water in the fish carp with a pump, install a cooler consisting of a refrigeration cycle on the circulation path, and exchange heat with the refrigeration cycle. The water is cooled. The coolers of Patent Documents 1 and 2 are installed outside the fish carp, and the cooler of Patent Document 3 is installed inside the fish carp.

  Moreover, the cooling machine described in Patent Document 4 arranges a cooling pipe on the wall around the fish carp, and the refrigerant flowing through the cooling pipe circulates to exchange heat with the refrigeration cycle installed outside, thereby The water inside is cooled.

  In Patent Document 5, the water surface of the fish carp is covered with nitrogen gas-filled ice obtained by freezing water containing nitrogen gas, and the dissolved oxygen content of the water in the fish carp is reduced by melting the nitrogen gas-filled ice. A technique for maintaining the freshness of fish is disclosed.

Japanese Examined Patent Publication No. 63-35909 Japanese Patent Application Laid-Open No. 7-146013 Japanese Utility Model Publication No. 4-27369 Japanese Utility Model Publication No. 4-23984 JP 2007-155172 A

  The nitrogen gas-filled ice of Patent Document 5 requires a large-scale production facility because the nitrogen gas-filled ice needs to be produced in a fishing boat. In addition, the dissolved oxygen amount of water in the fish carp is indirectly reduced by melting the nitrogen gas-filled ice, so in order to sufficiently reduce the dissolved oxygen content, nitrogen gas filling with water in the fish carp is used. It is necessary to repeatedly freeze and thaw ice. For this reason, in order to maintain the freshness of the fish in the fish cage using the nitrogen gas sealed ice, the cost becomes high.

  In view of the above situation, an object of the present invention is to provide a low cost fish carp system for maintaining the freshness of fish by reducing the dissolved oxygen content of water in the fish carp and increasing the dissolved nitrogen content.

In order to solve the above problems, the present invention has the following configuration.
A first aspect of a fish carp system with a nitrogen water conversion device according to the present invention is a fish carp system comprising a fish carp and a cooler for cooling the water in the fish carp. A nitrogen water conversion device installed outside the fish carp to reduce the amount and increase the amount of dissolved nitrogen to convert it into nitrogen water; The nitrogen water extractor for extracting nitrogen gas from the atmosphere and the nitrogen gas injector for injecting the extracted nitrogen gas into the water that passes through the water circulation means It is characterized by comprising.

  In the first aspect, the cooler is installed outside the fish carp, and the water circulation means passes water taken from the fish carp through the cooler before passing it through the nitrogen water conversion device. It is characterized by cooling by heat exchange.

  In the first aspect, the cooler is installed inside the fish carp, and the water circulation means passes the water in the fish carp through the cooler and cools it by heat exchange. It is characterized by taking out.

  Said 1st aspect WHEREIN: The said cooling means is a heat exchanger which comprises the evaporator of a refrigerating cycle, It is characterized by the above-mentioned.

  Said 1st aspect WHEREIN: The said cooling means is a heat exchanger which heat-exchanges with the cooled brine, The said brine is cooled by another heat exchanger which comprises the evaporator of a refrigerating cycle, It is characterized by the above-mentioned. To do.

  In the first aspect, the cooler circulates the cooling pipe disposed so as to be in contact with the water in the fish carp and the refrigerant flowing in the cooling pipe to be cooled by heat exchange through the cooler. And a refrigerant circulation means.

  In the first aspect, the apparatus further includes a nitrogen gas injection pipe installed in the fish carp, and the nitrogen gas extracted by the nitrogen gas extractor is sent to the nitrogen gas injector and simultaneously with the nitrogen It is also sent to a gas injection pipe and injected into the water in the fish carp through the nitrogen gas injection pipe.

  A second aspect of the fish carp system with a nitrogen water conversion device according to the present invention is a fish carp system comprising a fish carp and a cooler for cooling the water in the fish carp. A nitrogen water conversion device for reducing the dissolved oxygen amount and increasing the dissolved nitrogen amount to convert it into nitrogen water, the nitrogen water conversion device being installed outside the fish carp and extracting nitrogen gas from the atmosphere A nitrogen gas generator having a nitrogen gas extractor, and a nitrogen gas injection pipe installed inside the fish carp, wherein the nitrogen gas extracted by the nitrogen gas extractor is in the nitrogen gas injection pipe It is sent to the water in the fish carp through the nitrogen gas injection pipe.

  In the second aspect, the cooler is installed outside the fish carp, and the water circulating means cools the water taken out from the fish carp through the cooler by heat exchange, and then the fish carp. It is characterized by returning to the inside.

In the second aspect, the cooler is installed in the fish carp, and the water circulation means cools the water in the fish carp through the cooler by heat exchange and then into the fish carp. It is characterized by returning.
Said 2nd aspect WHEREIN: The said cooling means is a heat exchanger which comprises the evaporator of a refrigerating cycle, It is characterized by the above-mentioned.
Said 2nd aspect WHEREIN: The said cooling means is a heat exchanger which heat-exchanges with the cooled brine, The said brine is cooled by another heat exchanger which comprises the evaporator of a refrigerating cycle, It is characterized by the above-mentioned. To do.

  In the second aspect, the cooler circulates the cooling pipe disposed so as to be in contact with the water in the fish carp and the refrigerant flowing in the cooling pipe to be cooled by heat exchange through the cooler. And a refrigerant circulation means.

  Said 1st or 2nd aspect WHEREIN: The ultraviolet sterilizer for sterilizing the water in the said fish salmon was provided.

  The fish carp system with the nitrogen water conversion device of the present invention circulates the water (usually seawater) in the fish carp between the fish carp and the nitrogen water conversion device by water circulation means and passes it through the nitrogen water conversion device. Nitrogen gas is dissolved in the water, and dissolved oxygen is expelled to reduce the amount of dissolved oxygen. For example, if it is circulated for about 1 hour, 99% of the dissolved gas in 2 tons of water can be nitrogen. Alternatively, nitrogen gas is injected into the water in the fish carp by injecting nitrogen gas through a nitrogen gas injection pipe installed in the fish carp, and the dissolved oxygen amount is reduced by expelling dissolved oxygen. Thus, the water in the fish salmon becomes water in which nitrogen gas is abundantly dissolved, that is, “nitrogen water”.

  The water in the fish bowl is cooled by a cooler. It is known that water dissolves more gas at lower temperatures. Therefore, the water in the fish carp is cooled by a cooler and then passed through a nitrogen water conversion device, or the water in the fish carp is cooled by a cooler and sprayed with nitrogen gas to dissolve the nitrogen gas. Can be made easier.

  By making the water in the fish cage into nitrogen water, the effect of maintaining the freshness of the fish caught can be remarkably improved. Conventionally, it has been thought that supplying oxygen to keep fish fresh is important, but in the present invention, rather than keeping fish alive, maintaining the freshness of fish meat tissues and internal organs, as well as oxidation and decay Prioritizing prevention. The fish to which the present invention is applied has a freshness maintenance period longer than before, even after it has been distributed and sold after landing, so it can be sold to areas that could not be sold until now. The market can be expanded.

FIG. 1 is a diagram schematically showing a configuration example of a fish carp system with a nitrogen water conversion device of the present invention. FIG. 2 is a diagram schematically showing another configuration example of the fish carp system with a nitrogen water conversion device of the present invention. FIG. 3 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention. FIG. 4 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion device of the present invention. FIG. 5 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention. FIG. 6 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a configuration example of a fish carp system with a nitrogen water conversion device of the present invention.

  1 includes a fish carp 6, a cooler 2, and a nitrogen water converter 3. The fish rod 6 is installed in a fishing boat in order to maintain the freshness of the fish caught. The water in the fish bowl 6 is usually seawater. However, the present invention can also be applied to fresh water, and can also be applied to water in which seawater and fresh water are mixed. In the illustrated example, only one fish carp 6 is shown, but the present invention can be applied to a case where a plurality of fish carps 6 are installed.

  Usually, seawater is pumped up by an appropriate pump or the like and filled into the fish bowl 6. In order to kill germs in the water, it is preferable to pass through an ultraviolet sterilizer 91 when filling the fish cake 6. The ultraviolet sterilization apparatus 91 can be similarly applied to a configuration example shown with reference to other drawings described later.

  The water in the fish bowl 6 is taken out from the fish bowl 6 and passes through the nitrogen water conversion device 3 so that the amount of dissolved oxygen decreases and the amount of dissolved nitrogen increases to be converted into nitrogen water. Returned. In order to circulate water in this way, a water circulation means is provided. The water circulation means is specifically the water circulation pump 4 and appropriate piping. The water circulation path is schematically shown by a thick line with black arrows (the same applies to the following figures).

  In order to keep the water in the fish bowl 6 clean, an ultraviolet sterilizer 92 is arranged in the middle of the water circulation path or in the fish bowl as shown in FIG. It is preferable to let it pass. This ultraviolet sterilization apparatus 92 can be similarly applied to a configuration example shown with reference to other drawings described later.

  In this example, the cooler 2 for keeping the water in the fish bowl 6 at a low temperature is installed outside the fish bowl 6 and is arranged in front of the nitrogen water converter 3. The cooler 2 constitutes a refrigeration cycle in the illustrated example. In a general refrigeration cycle, refrigerant circulates through the compressor, condenser, expansion valve, and evaporator 21 elements. When the refrigerant evaporates in the evaporator 21, heat exchange is performed to absorb heat from the water taken out from the fish carp 6. The water cooled by the cooler 2 is sent to the nitrogen water converter 3. Since the solubility of nitrogen increases as the water temperature decreases, the lower the temperature, the more effective the nitrogen substitution. Therefore, it is preferable to cool the water first and then inject nitrogen gas. However, the water temperature is set taking into consideration the optimum temperature for maintaining the freshness of the fish.

  The nitrogen water conversion device 3 is installed outside the fish bowl 6. The gas flow is indicated by a dotted line with a white arrow (the same applies to the following figures). The nitrogen water conversion apparatus 3 includes an air compressor 31 that compresses the atmosphere, a nitrogen gas extractor 32 that extracts nitrogen gas from the compressed air, and a nitrogen gas injector 33 that injects the extracted nitrogen gas into water that passes through. To do. As the air compressor 31, for example, an oil-free BBICON (registered trademark) manufactured by Hitachi Industrial Equipment Systems Co., Ltd. can be used. Use a supply air pressure of 0.5 to 0.9 megapascals.

  The nitrogen gas extractor 32 takes compressed air into one end of a pressure vessel provided with a nitrogen separation membrane made of a polyimide hollow fiber membrane, purges (discharges) oxygen from the side port, and nitrogen gas from the other end of the pressure vessel. Take out. For example, a degassing apparatus “Riprel” (registered trademark) manufactured by Katayama Chemical Industry Laboratory Co., Ltd. can be used.

  The nitrogen gas injector 33 is treated, for example, by passing 2 tons (2 cubic meters) of water per hour and has the ability to drive oxygen to a dissolved oxygen amount of 1.0 milligram per liter. The high-pressure nitrogen gas sent from the nitrogen gas extractor 32 is injected into the passing water by an injection nozzle (not shown). This injection nozzle promotes nitrogen substitution by making particles of nitrogen gas to be injected fine.

  If the water in the fish bowl 6 is circulated for about 1 hour, 99% of the dissolved gas in 2 tons of water can be converted to nitrogen. After the amount of dissolved nitrogen reaches a predetermined amount, the nitrogen water conversion device 3 may be stopped to simply allow water to pass through. Thereafter, the nitrogen water converter 3 may be operated from time to time so that the amount of dissolved nitrogen is not reduced.

  FIG. 2 is a diagram schematically showing another configuration example of the fish carp system with a nitrogen water conversion device of the present invention. In addition, about the component which has the same function as FIG. 1, it has shown with the same code | symbol.

  A fish carp system 1B with a nitrogen water conversion device in FIG. 2 includes a fish carp 6, a cooler 2, and a nitrogen water conversion device 3. The difference from the fish carp system 1A in FIG. 1 is that the cooler 2 is installed in the fish carp 6. Therefore, the water circulation means in this case is that the water in the fish cage 6 is first cooled by heat exchange through the cooler 2 installed in the fish cage, and then taken out from the fish cage 6 to the nitrogen water conversion device 3. send.

  FIG. 3 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention. In addition, about the component which has the same function as FIG. 1, it has shown with the same code | symbol.

  A fish carp system 1C with a nitrogen water conversion device in FIG. 3 includes a fish carp 6, a cooler 2, and a nitrogen water conversion device 3. 1 is different from the fish carp system 1A in FIG. 1 in that the water cooling method in the fish carp 6 is different. In this example, the water in the fish carp 6 is not directly cooled by heat exchange with the cooler 2, but is indirectly cooled by the cooling pipe 11 arranged so as to be in contact with the water in the fish carp 6. . In FIG. 3, the cooling pipe 11 is schematically shown. However, for example, the cooling pipe 11 having a zigzag folded shape is disposed on the inner surface of the side wall of the fish carp 6. The cooling pipe 11 is filled with a refrigerant. The refrigerant in the cooling pipe 11 is circulated through the cooler 2 by the refrigerant circulation means including the refrigerant circulation pump 5 and appropriate piping. The refrigerant circulation path is schematically indicated by a dashed line with an arrow. The refrigerant is cooled by exchanging heat with the evaporator 21 in the cooler 2. As a result, the water in the fish bowl 6 in contact with the cooling pipe 11 is cooled.

  The water circulation path in which the water in the fish bowl 6 is sent to the nitrogen water conversion device 3 by the water circulation pump 4 and replaced with nitrogen to return the nitrogen water to the fish bowl 6 except that water does not pass through the cooler 2. 1 and FIG. 2 are the same as the fish carp system.

  FIG. 4 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion device of the present invention. In addition, about the component which has the same function as FIG. 1, it has shown with the same code | symbol.

  4 includes a fish carp 6, a cooler 2, and a nitrogen water conversion apparatus. 1 is different from the fish carp system 1A of FIG. 1 in that the nitrogen water conversion device includes a nitrogen gas generator 7 installed outside the fish carp 6 and a nitrogen gas injection pipe 8 installed inside the fish carp 6. It is a point that is composed.

  The nitrogen gas generator 7 includes an air compressor 71 that compresses the atmosphere, and a nitrogen gas extractor 72 that extracts nitrogen gas from the compressed air. These include the air compressor 31 of the fish carp system 1A in FIG. This is the same as the nitrogen gas extractor 32. In the fish carp system 1D of FIG. 4, the nitrogen gas extracted by the nitrogen gas extractor 72 is sent to the nitrogen gas injection pipe 8 through an appropriate pipe at a high pressure.

  The nitrogen gas injection pipe 8 is, for example, a long pipe extending in the horizontal direction in the fish carp 6, and a plurality of holes 8 a for ejecting nitrogen gas are formed in the pipe wall. Nitrogen gas injected into water at high pressure dissolves in water and simultaneously expels dissolved oxygen. In this way, the amount of dissolved oxygen in the water in the fish bowl 6 is reduced, and the amount of dissolved nitrogen is increased to convert it into nitrogen water.

  In the fish carp system 1D of FIG. 4, after the cooler 2 is installed outside the fish carp 6, the water circulation pump 4 passes the water taken from the fish carp 6 through the cooler 2 and cools it by heat exchange. Return to fish bowl 6. Thereby, the water in the fish bowl 6 is cooled.

  Further, as a modification of the fish carp system 1D of FIG. 4, a form (not shown) in which a cooler is installed inside the fish carp 6 as in the fish carp system 1B of FIG. In that case, the water circulation pump sucks the water in the fish carp into a cooler in the fish carp, cools it by heat exchange through the cooler, and then returns the water to the fish carp without taking it out.

  Furthermore, as a modified form of the fish carp system 1D in FIG. 4, a form (not shown) in which the water in the fish carp 6 is indirectly circulated without circulating the water in the fish carp system 6 as in the fish carp system 1C in FIG. ) Is also possible.

  FIG. 5 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention. In addition, about the component which has the same function as FIG. 1, it has shown with the same code | symbol.

  A fish carp system 1E with a nitrogen water conversion apparatus in FIG. 5 includes a fish carp 6, a cooling system 2A, and a nitrogen water conversion apparatus. 1 is different from the fish carp system 1A in FIG. 1 in that the water cooling means in the fish carp 6 is not a direct cooling system by the cooler 2 but a secondary cooling system through brine (antifreeze). It is a point.

  In the cooling system 2A, the brine supplied from the brine tank 23 and circulated by the pump exchanges heat with the water in the fish bowl 6 in the heat exchanger 22 and cools it. In the brine 2, the cooler 2 constitutes a refrigeration cycle. The brine is cooled by heat exchange in the evaporator 21 of the cooler 2. In the condenser of the cooler 2, heat exchange is performed with water circulated between the cooling towers 24.

  Although not shown, as another example, the heat exchanger 22 in the cooling system 2A may be installed in the fish bowl 6.

  The means for cooling water in the fish carp of the fish carp system to which the present invention is applied is not limited to a specific method, and the present invention can be applied to any fish carp system provided with any cooling means.

  FIG. 6 is a diagram schematically showing still another configuration example of the fish carp system with a nitrogen water conversion apparatus of the present invention. In addition, about the component which has the same function as FIG. 1, it has shown with the same code | symbol.

  A fish carp system 1F with a nitrogen water conversion device of FIG. 6 includes the same fish carp 6 as the fish carp system 1A of FIG. 1, a cooler 2, and a nitrogen water conversion device 3, and the fish carp of FIG. 4 described above. As shown in the system 1D, a nitrogen gas injection pipe 8 installed in the fish bowl 6 is provided. In the fish carp system 1F, the nitrogen gas generated by the nitrogen gas extractor 32 of the nitrogen water converter 3 is sent to both the nitrogen gas injector 33 and the nitrogen gas injection pipe 8. In this method, the injection of nitrogen gas in the middle of the water circulation path in the fish carp 6 and the direct injection of nitrogen gas into the fish carp 6 are used in combination.

  Although not shown, in each fish carp system shown in FIGS. 1 to 3 and FIG. 5, similarly to the fish carp system 1F in FIG. It may be used in combination with nitrogen gas injection.

  Besides the configuration examples described above, various modifications of the present invention can be implemented. Although there are various types of existing fish carp systems, the present invention can be easily implemented in an existing fish carp system because it is only necessary to attach a nitrogen water conversion device to any of the systems. Is possible.

1A, 1B, 1C, 1D Fish carp system with nitrogen water converter 2 Cooler 2A Cooling system 21 Evaporator 22 Heat exchanger 23 Brine tank 24 Cooling tower 3 Nitrogen water converter 31 Compressor 32 Nitrogen gas extractor 33 Nitrogen gas injection 34 Nitrogen gas injection nozzle 4 Water circulation pump 5 Refrigerant circulation pump 6 Fish carp 7 Nitrogen gas generator 71 Compressor 72 Nitrogen gas extractor 8 Nitrogen gas injection pipe 91, 92 UV sterilizer

Claims (14)

In a fish carp system comprising a fish carp and a cooling means for cooling the water in the fish carp,
A nitrogen water conversion device installed outside the fish salmon to reduce the dissolved oxygen amount of the passing water and increase the dissolved nitrogen amount to convert it into nitrogen water;
Water circulation means for circulating water so that water is taken out from the fish carp and passed through the nitrogen water conversion device and then returned to the fish carp.
The nitrogen water conversion apparatus includes a nitrogen gas extractor that extracts nitrogen gas from the atmosphere, and a nitrogen gas injector that injects the extracted nitrogen gas into water that passes through the nitrogen water conversion apparatus. Fish carp system.   The cooling means is installed outside the fish carp, and the water circulation means cools the water taken out from the fish carp through the cooling means through heat exchange before passing it through the nitrogen water converter. The fish trough system with a nitrogen water conversion device according to claim 1,   The cooling means is installed inside the fish carp, and the water circulation means passes the water in the fish carp through the cooling means and cools it by heat exchange, and then removes the water from the fish carp. Item 4. A fish carp system with a nitrogen water conversion apparatus according to item 1.   4. The fish carp system with a nitrogen water conversion device according to claim 2 or 3, wherein the cooling means is a heat exchanger constituting an evaporator of a refrigeration cycle.   The cooling means is a heat exchanger that exchanges heat with cooled brine, and the brine is cooled by another heat exchanger that constitutes an evaporator of a refrigeration cycle. The fish carp system with the described nitrogen water conversion device. A cooling pipe arranged so that the cooling means is in contact with the water in the fish carp;
2. The fish carp system with a nitrogen water conversion device according to claim 1, further comprising: a refrigerant circulation unit that circulates the refrigerant flowing through the cooling pipe through the cooling unit so as to be cooled by heat exchange.   The apparatus further comprises a nitrogen gas injection pipe installed inside the fish carp, and the nitrogen gas extracted by the nitrogen gas extractor is sent to the nitrogen gas injection pipe at the same time as being sent to the nitrogen gas injector. The fishfish system with a nitrogen water conversion device according to any one of claims 1 to 6, wherein the fishfish system is injected into the water in the fish carp through the nitrogen gas injection pipe. In a fish carp system comprising a fish carp and a cooling means for cooling the water in the fish carp,
A nitrogen water conversion device for reducing the dissolved oxygen content of the water in the fish cake and increasing the dissolved nitrogen content to convert it into nitrogen water, the nitrogen water conversion device installed outside the fish cake and the atmosphere A nitrogen gas generator having a nitrogen gas extractor for extracting nitrogen gas from the inside, and a nitrogen gas injection pipe installed inside the fish carp, wherein the nitrogen gas extracted by the nitrogen gas extractor is A fish carp system with a nitrogen water conversion device, wherein the fish carp system is fed to the nitrogen gas injection pipe and injected into the water in the fish carp through the nitrogen gas injection pipe.   The cooling means is installed outside the fish carp, and the water circulation means cools the water taken out from the fish carp through the cooling means by heat exchange, and then returns it to the fish carp. The fish trout system with a nitrogen water conversion device according to claim 8.   The cooling means is installed inside the fish carp, and the water circulation means cools the water in the fish carp through the cooling means by heat exchange, and then returns the water into the fish carp. Item 9. A fish carp system with a nitrogen water conversion device according to item 8.   The fish tank system with a nitrogen water conversion device according to claim 9 or 10, wherein the cooling means is a heat exchanger constituting an evaporator of a refrigeration cycle.   The cooling means is a heat exchanger that exchanges heat with cooled brine, and the brine is cooled by another heat exchanger constituting an evaporator of a refrigeration cycle. The fish carp system with the described nitrogen water conversion device. A cooling pipe arranged so that the cooling means is in contact with the water in the fish carp;
9. A fish carp system with a nitrogen water conversion device according to claim 8, further comprising refrigerant circulation means for circulating the refrigerant flowing in the cooling pipe through the cooling means for cooling by heat exchange.   The fish carp system with a nitrogen water conversion device according to any one of claims 1 to 13, further comprising an ultraviolet sterilizer for sterilizing water in the fish carp.

Images