JPS5828542Y2 - Fish storage device for coastal fishing boats - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a storage device for maintaining the freshness of the catch on a fishing boat that goes fishing in coastal waters and takes about 3 to 4 days for one voyage.

This type of fishing boat normally loads a large amount of ice before setting out, and after returning to port, the catch is immersed in water ice. The osmotic pressure is different in fish, and the water passes through the fish skin and dilutes the body fluids inside the fish, which reduces the freshness and taste.Also, the temperature rises because the fish is immersed in water ice, so water is often diluted. It must be discarded and replaced with new ice, and if ice is present,
There are also drawbacks, such as the fish body being scratched and damaged by the movement of the boat, reducing its commercial value.

In order to prevent this damage, fishing boats are no longer loaded with ice, instead they are filled with warm fresh water before setting sail, and are operated by refrigerators to
．． The method used is to cool the fish to about 5°C and immerse the fish in this cooling water.

In this case, due to the motion of the ship and the immersed fish, the low-temperature water remains agitated and does not freeze, avoiding damage to the fish. The negative effect of deterioration occurs.

In addition, in order to maintain the freshness of fish, fishing boats are loaded with fresh water and set sail, and by mixing fresh water and seawater into the warm water, it is made into semi-saline water with a salinity equivalent to the osmotic pressure of the body fluids of a warm body. A method of immersion has been adopted in some cases, but this requires the installation of a large capacity fresh water tank on board, which reduces the ship's speed due to the increased weight, increases fuel costs, and increases the temperature of the seawater depending on the state of the seawater. There were problems such as contamination of the fish inside.

The present invention aims to improve these drawbacks and provide a device with a simple structure that can preserve fresh catch for a long time.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a seawater pump that pumps up seawater and sends it out; 2 is a sand filter that removes floating matter and solid matter in the seawater; 3 is a cartridge filter that removes microparticles in the seawater; 4 is a pressurized seawater pump that sends it out. a high-pressure pump; 5 is a reverse osmosis membrane module that separates seawater into desalinated water and concentrated water by passing through a semipermeable membrane 7; 6 is a reverse osmosis membrane module whose main parts are the high-pressure pump 4 and the reverse osmosis membrane module 5; The above equipment is connected in the above order through seawater pipes.

Reference numeral 13 denotes a warmer for storing the catch, which is connected to the reverse osmosis membrane module 5 via a desalinated water pipe 8 and a raw brine water pipe 8'.

9 is a branch pipe for taking out a portion of desalinated water; 10 is a salinity meter for detecting the salt concentration in the raw salt water pipe 81; 11
12 is a concentrated water branch pipe that sends a portion of the concentrated water to the desalinated water pipe 8; 14 is circulated through a return pipe 15; A refrigerator 16 is a sterilizer tank for cooling the semi-saline water in the warm water tank 13, and 16 is a sterilizer tank such as a diluted formalin solution, the inlet side of which is connected to the branch pipe 17 from the demineralized water pipe 8, and the outlet side connected to the high-pressure pump 4. The inflow side has been contacted.

It goes without saying that each of the above pipings is provided with a required on-off valve.

Next, the operation of the catch storage device for a fishing boat having the above configuration will be explained.

Salinity concentration T, D, S, approximately 35. The seawater of OOOpIIMI is sent to the sand filter 2 while maintaining a pressure of approximately 2 kg/cyyt through the pump 1, where suspended matter, solid matter, etc. in the seawater are removed, and further, microparticles are removed in the cartridge filter 3 to make it clear. Become.

This clear seawater is sent to a reverse osmosis pressure device 6 for desalinated water, is pressurized to approximately 50 kg/ffl by a high-pressure pump 4, and passes through a semipermeable membrane 7 to produce a low salinity concentration of 1,500 to 3,000 pI)In. The seawater becomes desalinated water and flows out from the raw salt water pipe 8, while the seawater removed by the semipermeable membrane 7 becomes concentrated water with a high salt concentration of about 40,000 pp. Part of it flows out from the concentrated water branch pipe 12, and the rest Next, the desalinated water flowing through the raw brine pipe 8 is appropriately mixed with the concentrated water from the concentrated water branch pipe 12, thereby allowing the body fluids of the fish to be stored at the temperature 13 described below to permeate. Make semi-saline water adjusted to a salt concentration corresponding to the pressure.

Although the exact value of the osmotic pressure of fish body fluids is unknown,
In actual equipment, it is not necessary to regulate it so strictly, and so that it can be used over a wide range, the salinity concentration is approximately half that of seawater.
That is, semi-salt water may be used.

Therefore, for example, to, o o o ~ 15,000f)
The concentrated water from the concentrated water branch pipe 12 is appropriately mixed while monitoring the salinity meter 10 so that the pH becomes semi-saline water.

In this case, the concentrated water in the concentrated water branch pipe 12 is maintained at a high pressure by the high pressure pump 4 at the inlet of the reverse osmosis membrane module 5, so when mixing it with the desalinated water in the raw salt water pipe 8, the pump is not necessary, and since the concentration is high, only a small amount is required compared to mixing with seawater.

Furthermore, when this concentrated water passes through the sand filter and cartridge filter in front of the module 5, fine particles such as suspended matter and solid matter in the seawater are removed.
The semi-saline water after mixing with the desalinated water is in a clearer state than when a large amount of seawater is mixed with the desalinated water in the raw salt water pipe 8, and this clear semi-saline water can be supplied to the temperature 13. The concentration of salt water can be roughly adjusted, so as you get used to it, you can adjust it by simply checking the taste without using a salinity meter.
The fish is introduced into a heating chamber 13 equipped with 4, and the fish is immersed and stored at a temperature of about ±0.5°C.

Therefore, the fish body is maintained at a low temperature, and the semi-saline water has a salt concentration corresponding to the osmotic pressure of the body fluid of the fish body, preventing leaching of the body fluid and maintaining freshness and meat quality.

After the heat exchange, the brine is transferred to the refrigerator 1 through the return pipe 15.
It is returned to 4 and circulated.

Moreover, the seawater pump 11 and the seawater pipe 19 are used to clean the inside of the warming chamber 13 after landing of the catch.

In this case, in order to produce semi-saline water, it is conceivable to mix raw, untreated seawater with desalinated water from the reverse osmosis module 5, for example, by using the seawater pump 11 in the drawings via the seawater pipe 18. In this case, it is necessary to operate the seawater pump 11 in addition to the operation of the high-pressure pump 4 to the reverse osmosis pressure module 5, which increases the amount of fuel used. This is not desirable in terms of preserving the catch, as it not only contains floating matter and solid matter, but also oil from the binge etc. discharged by fishing boats during operation.

In the case of near-sea fishing where departures, returns, and anchorages are frequent, if anchorage is prolonged due to weather, movement of fishing schools, fishing market conditions, etc., and this reverse osmosis pressure device 6 is stopped for several days or more, In order to prevent bacteria, algae, etc. from breeding and contaminating the device and clogging the semipermeable membrane 7, a formalin solution of approximately 0.3%, for example, is pumped from the disinfectant tank 16 to the inlet side of the high-pressure pump 40. and fill the device 6.

Pipe 17 is a demineralized water branch pipe for preparing formalin solution.

When restarting operation, the desalinated water immediately after the start of operation is discharged, and after the odor disappears, it is sent to the heating 13, but according to past experience, about 2 hours is sufficient for the discharge time.

In summary, the present invention is equipped with a reverse osmosis device that uses seawater as a raw material to obtain desalinated water, and a warming device for storing catches that is equipped with a refrigerator. The reverse osmosis pressure device and the fish storage warmer are connected to the reverse osmosis pressure device and the fish storage warmer so that the semi-saline water is mixed with the concentrated water of the fish body fluid to obtain semi-saline water having an osmotic pressure approximately equivalent to the osmotic pressure of the fish body fluid, and this semi-saline water is supplied to the fish catch storage warmer. The gist is a catch storage device for inshore fishing boats that is connected by piping, and according to this device, the salinity concentration ranges from 1,500 to 3.5%, obtained by a reverse osmosis device using filtered and clarified seawater as raw material. Desalinated water of about OOppm and concentrated water of about 40,000 ppm are mixed to obtain a salt concentration (t o, o
Since the warm body can be preserved by immersing the fish body in semi-salt water (approximately 15,000 ph), the dilution of fish body fluids is prevented and the freshness, meat quality, and taste can be maintained as they are. Since the salt water can be kept at around ±0.5℃ using a refrigerator, it can maintain its freshness for a longer period of time, and the freshness of the fish does not deteriorate even when returning to the port after fishing. There is no fear of damage caused by scratches, and the product can be shipped to the market as a product with good color and luster and high commercial value.

Moreover, according to the present invention, the semi-salt water supplied for heating is
It is a mixture of demineralized water from a reverse osmosis device and concentrated water,
Desalinated water is purified by a reverse osmosis membrane, and concentrated water is also almost purified by a sand filter and cartridge filter, which are pre-treatments for the reverse osmosis device, so contamination of fish bodies is significantly reduced and the storage capacity of fish bodies can be improved. It is.

Furthermore, since semi-saline water is supplied to the heating tank while being mixed with desalinated water and concentrated water using the high-pressure pump of the reverse osmosis device, there is no need to operate another seawater pump, and the operation is easy. It is possible to provide a catch storage device for inshore fishing boats that consumes less fuel.

[Brief explanation of the drawing]

The drawing is a flow sheet showing an embodiment of the present invention. 1...Seawater pump, 2...Sand filter, 3...Cartridge filter, 4.
... High pressure pump, 5 ... Reverse osmosis membrane module, 6 ... Reverse osmosis pressure device, 7 ... Semipermeable membrane, 8 ... Desalinated water delivery pipe, 9... Desalinated water discharge branch pipe, 10... Salinity meter, 11.
... Seawater pump, 12 ... Concentrated water branch pipe, 13 ... Warming, 14 ... Refrigerator, 1
5...Semi-saline water return pipe, 16...Bactericide tank, 17...Demineralized water branch pipe, 1B, 19...
...Seawater pipe.

Claims (1)

[Scope of utility model registration request] It is equipped with a reverse osmosis device that obtains desalinated water using seawater as a raw material, and a warmer for storing catch that is equipped with a refrigerator, and mixes the desalinated water from the reverse osmosis device with concentrated water that also comes from the reverse osmosis device. The reverse osmosis pressure device and the catch storage heater are connected by piping so as to make semi-saline water approximately equivalent to the osmotic pressure of the fish body fluid, and to supply this semi-saline water to the catch storage heater. A catch storage device for inshore fishing boats.