JPH025382B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for keeping fish fresh, and more specifically, to an offshore trawl fishing boat, a saury bar seine fishing boat, an inshore bonito pole-and-line fishing boat, a tuna longline fishing boat, a Chubu salmon fishing boat. Applicable to fishing boats with relatively short voyages (within about 2 weeks), such as trout drift net fishing boats, northern turning boats, purse seiners, and squid fishing boats, to maintain high freshness of warm-current and cold-current high-capture fish species. Therefore, the cooling processing device is realized at low cost.

[Prior Art] For fishing boats, maintaining the freshness of the catch is the most important issue along with the operational method for catching. However, when all fish die after being caught, the body temperature of the fish increases due to the generation of rigidity and heat generation. As a result, the activity of enzymes, microorganisms, putrefactive bacteria, etc. within the fish becomes active, reducing the freshness of the fish.

Conventionally, methods for storing catches onboard fishing vessels and preserving freshness have been roughly divided into the following four methods:
There is a way.

(1) Bulk icing method (also called ice or fried ice method) (2) Boxed icing method (3) Cold seawater immersion method (also called water ice method) (4) Cryopreservation method [Invention will solve the problem] Among the above methods for preserving freshness, methods (1) and (2) require a large amount of ice, require excessive labor from the crew, and impair hygiene. Due to the above-mentioned problems, the cost is high, and the freshness cannot be maintained satisfactorily when using fish species that are frequently caught.

Furthermore, according to recent research, the relationship between fish body temperature and time regarding the freshness limit of cold-water fish is roughly expressed by the following equation.

{(Fish body temperature) ℃ + 2.5} × {(Freshness limit time)} = 600 For example, a fish whose body temperature was 4℃ immediately after being caught will become 10℃ due to rigor heat after death. According to the above formula, the freshness limit of this fish is 48 hours.

Therefore, if such fish bodies are not iced or cooled, the temperature of the fish body will further rise due to external heat energy entering the fish hold, and the freshness retention time will be shortened.

In addition, with method (3) above, sufficient freshness cannot be maintained, and furthermore, with method (4),
Although the crew labor and hygiene problems could be solved, there was a problem in that the initial cost and running cost for cooling the catch increased.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned conventional problems.It aims at reducing the initial cost and running cost, and also makes it possible to quickly cool the catch, and also to keep the catch fresh and fresh. An object of the present invention is to provide a device for preserving the freshness of fish that can improve freshness.

[Means for solving problems]

The apparatus for keeping the catch fresh according to the present invention comprises: a cold sea water tank installed in the body of a fishing boat or the like to cool the catch; a refrigeration device that circulates and cools the cold sea water in the cold sea water tank; a cold seawater pumping mechanism for pumping and supplying low-temperature seawater from the deep sea layer into the seawater basin; a fishwater separation mechanism for sucking the catch cooled in the cold seawater basin and the cold water by a transport pump and separating them; A fish storage area installed inside the hull to store and preserve the catch separated by the fish-water separation mechanism, and transporting the captured fish to the cold sea water storage area and transferring the cooled fish to the fishing storage storage area. It is composed of a transport mechanism.

[Action of the invention]

In the present invention, a cold seawater pumping mechanism pumps up low-temperature seawater from the deep sea layer and stores it in a cold seawater tank, and a refrigeration device cools this cold seawater to a temperature just before freezing, and catches fish that are immersed in it. The system cools the fish quickly, separates the cooled catch using a fish-water separation mechanism, and then stores it refrigerated in a fish storage hold, which suppresses the rigidity of the fish and keeps the fish fresh on board. This becomes possible.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the overall system configuration of the catch freshness-keeping device according to the present invention, in which 1 is a cold seawater tank that cools the caught catch 2, and 3 is a heat exchanger that cools the cold seawater. The primary side of this heat exchanger 3 is connected to a refrigerator 4, and the secondary side is connected in series to a pipe 5 that circulates cold water in the cold seawater tank 1, and a cold water circulation pump is connected to the pipe 5. 6 is interposed. 7 is a strainer attached to the suction port of the pipe 5.

Further, one end of a cold seawater introduction pipe 8 is connected to the cold water inlet side of the secondary side of the heat exchanger 3, and a cold seawater pump 9 is interposed in the cold seawater introduction pipe 8. At the same time, a flexible pipe 1 for pumping seawater is connected to the other end of the cold seawater introduction pipe 8 via a universal joint 10.
One end of 1 is connected. The flexible tube 11 is
It is suspended in the sea to pump up low-temperature seawater from the cold water layer, and consists of multiple flexible tubes 1
1a connected via a universal joint 11b, and a strainer 11c is attached to the suction port at the other end.

In FIG. 1, reference numeral 12 is a fish water separator that separates the catch 2 cooled in the cold seawater tank 1 from cold water, and this separator 12 and the cold seawater tank 1 are connected by a catch transport pipe 13. A transport pump 14 is provided in the middle of the transport pipe 13 to suck the catch 2 together with cold water and transport it to the separator 12. In addition, the separator 12 is provided with separated cold water into a cold seawater tank 1.
A return pipe 15 is connected thereto, and a duct 17 is connected to transfer the separated catch 2 to a belt conveyor 16, and the cooled catch 2 transported by the belt conveyor 16 is transferred to a transfer duct 18. The catch is sent to the storage area 19 via the .

Further, 20 is a broken ice storage tank, and 21 is a broken ice spreader. The broken ice storage tank 20 and the broken ice spreader 21 are connected by a broken ice suction flexible pipe 22, and furthermore, on the discharge side of the broken ice spreader 21, an upper Supervised catch storage shed 19
A flexible tube 23 is connected to supply crushed ice to.

FIGS. 2 and 3 show schematic diagrams of the actual arrangement of the respective components of the freshness maintaining device shown in FIG. 1 above when they are arranged inside the hull 30 of a fishing boat.

In FIGS. 2 and 3, the same symbols as in FIG. 1 represent the same parts, 31 is the upper deck of the hull 30, 32 is the second deck, 33 is the engine room, 34 is the fuel tank, and 35 is the It is a fish processing plant.

Next, the operation of this embodiment configured as described above will be explained.

To maintain the freshness of the catch, first, the pump 9 is driven to pump cold seawater at a temperature of about 0°C to a depth determined by the hanging length of the flexible pump pipe 11, for example, several tens of meters deep. The water is sucked through the flexible pumping pipe 11, and sent to the cold seawater tank 1 through the introduction pipe 8, pump 9, and heat exchanger 3, and stored in a predetermined amount. Here, when the cold seawater passes through the heat exchanger 3, it exchanges heat with the refrigerant of the refrigerator 4 and is further cooled. Thereafter, by driving the circulation pump 6 to circulate the seawater stored in the cold seawater tank 1 through the circulation piping 5 and the heat exchanger 3, the heat exchanger 3 exchanges heat with the refrigerant of the refrigerator 4. The pumped cold seawater is heated to a temperature just before the freezing point, that is, approximately -1.0~
Cool to -1.5℃.

On the other hand, the catch 2 is transported by the belt conveyor 16.
A predetermined amount is poured into the cooled cold seawater tank 1,
After cooling the fish for 1 to 2 hours until the temperature of the fish reaches approximately 0°C, the fish transport pump 14 is driven to suck the cooled catch 2 together with cold water, and send it to the separator 12 through the transport pipe 13 to collect the fish. Separate into substance 2 and cold water. The separated catch 2 is transferred from a duct 17 onto a belt conveyor 16, and is then thrown into a catch storage shed 19 from a duct 18 by the belt conveyor 16. Further, the separated cold water is returned to the cold seawater tank 1 through the return pipe 15.

In order to block heat from entering from the outside, the fish storage compartment 19 is equipped with a cooling pipe through which refrigerant gas is passed.
By installing it on the ceiling and wall of the fishery, it is designed to prevent the temperature of the catch from rising. In addition, storage room 1
9, the crushed ice stored in the crushed ice storage tank 20 is passed through the flexible tube 22 by the crushed ice spreader 21.
The fish 2 is packed in ice by suctioning through the flexible tube 23 and sprayed into the fish storage tank 19, thereby ensuring the freshness of the fish.

The freshness maintaining device as described above can be applied to relatively small fishing boats, medium-sized fishing boats, and large-sized fishing boats.

In addition, cold seawater that has become contaminated due to immersion cooling of catches in cold seawater tank 1 will be transferred to cold seawater tank 1 based on the degree of contamination.
All you have to do is discharge the water overboard, then pump up new cold seawater from the sea and store a predetermined amount of water.

In the device of this embodiment as described above, after the fish is captured, it is immersed in cold seawater of about -1.0 to -1.5°C, and a large amount of cold heat is applied to the fish, so that the generation of rigidity heat in the fish is prevented. As a result, the freshness of the fish is ensured. In addition, since cold seawater of about 0℃ is used to cool the fish body, it is
This will reduce the running cost of the refrigerator required to cool the fish to 1.0 to -1.5 degrees Celsius, reduce the cost of processing the fish to keep it fresh, and also reduce the amount of labor required by the crew, making it possible to save labor.

Note that the means for pumping deep sea water in the present invention is not limited to the flexible tube 11, and the means for cooling cold seawater and the means for transporting catch are not limited to those configured in the above embodiments. Moreover, the crushed ice spreader and its accompanying mechanism may be omitted.

〔Effect of the invention〕

As described above, according to the present invention, the cold sea water tank for cooling the catch is filled with deep cold sea water by the pumping means, and this cold sea water is cooled by the cooling device, so that the catch is immersed in the cold sea water tank. This system cools the fish, separates the cooled catch using a fish water separator, and then stores it in a refrigerated storage room. In addition to reducing the initial cost and running cost for freshness preservation processing, and promoting energy and labor savings, it also improves the freshness and freshness of the catch, and has the effect of simplifying onboard storage.

[Brief explanation of drawings]

Fig. 1 is an overall system configuration diagram showing an example of the catch freshness keeping device according to the present invention, Fig. 2 is a schematic sectional view showing an example of arrangement of the catch freshness keeping device in a ship, and Fig. 3 is a plan view thereof. It is a diagram. 1...Cold sea water tank, 2...Fish, 3...Heat exchanger, 4...Freezer, 6...Circulation pump, 9...Lifting pump, 11...Flexible pipe for pumping, 12... Fish water separator, 13...transport pipe, 14...transport pump,
16...Conveyor, 19...Fish storage area, 20
...Crushed ice storage room, 21...Crushed ice spreader.

Claims (1)

[Claims] 1. A cold sea water tank installed inside the hull of a fishing boat or the like to cool the catch, a refrigeration system that circulates and cools the cold sea water in the cold sea water tank, and pumps low-temperature seawater from the deep sea layer into the cold sea water tank. A cold seawater pumping mechanism that supplies
A fish water separation mechanism that sucks the catch cooled in the cold seawater tank and cold water using a transport pump and separates the same, and a fish water separation mechanism that is installed inside the hull and stores and preserves the catch that has been separated by the fish water separation mechanism. A storage room and
A device for maintaining the freshness of fish catch, comprising a transfer mechanism that transfers captured fish to the cold seawater hold and cooled fish to the catch storage hold.