JPH042384Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a fish refrigeration system using nitrogen gas, which is used to refrigerate fish on fish transport ships or other places.

[Conventional technology]

Conventionally, fish refrigeration equipment is equipped with an air outlet connected to a compressed air supply source at the bottom of a fish refrigeration tank that stores fish, water, and ice together, and the air blown out from the air outlet There is a known structure in which the fish and cold water in the fish refrigerator tank are stirred to maintain a uniform temperature of the cold water throughout the tank.

Another known method for keeping fresh fish is to constantly supply seawater cooled using nitrogen gas to a fish tank.

[The problem that the idea attempts to solve]

In the case of the conventional fish refrigeration equipment, the oxygen dissolved in the water and the oxygen in the air that is blown in reacts with the fat of the fish, promoting rancidity, reducing the texture, and destroying the skin and scales of the fish. There is a problem that the freshness of fish decreases due to discoloration due to oxidation.

Furthermore, in the case of the conventional fresh fish preservation method, seawater cooled using nitrogen gas is constantly supplied to the fish tank, so there is a problem that nitrogen gas is wasted.

[Means to solve the problem]

The purpose of this invention is to provide a fish refrigerator using nitrogen gas that can advantageously solve the above-mentioned problems, and the gist of this invention is that fish, water, and ice are stored together. A blowing pipe 3 having a large number of blowing ports 2 is provided at the bottom of the fish cooling tank 1, and the blowing pipe 3 is connected to a discharge port of a compressor 8 via a supply pipe line 9. ,
An air supply control solenoid valve 10 is interposed, and
A nitrogen gas supply source is connected between the solenoid valve 10 and the blowing pipe 3 via a nitrogen gas supply control solenoid valve 12, and the exhaust port 14 at the top of the fish cooling tank 1 and the blowing port of the compressor 8 are connected. A fish refrigeration system using nitrogen gas is characterized in that the system is connected via a discharge pipe 15.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

1 to 4 show an embodiment of this invention, and show a fish refrigerating tank 1 in a fish transport vessel 6.
A plurality of blow-off units 4 are placed side by side at the bottom of the inside, and the blow-off units 4 are housed in a flat metal box 5 having a top plate and a peripheral plate, and are welded to the top plate. Fixed blow pipe 3
The blowing pipe 3 is bent in a zigzag shape, and a large number of blowing ports 2 are provided across the upper part of the blowing pipe 3 and the upper surface plate.

The blow pipe 3 in each blow-off unit 4 and the discharge port of the compressor 8 driven by the electric motor 7 are connected through a supply pipe line 9, and an air supply control solenoid valve 10 is interposed in the supply pipe line 9. is,
Furthermore, a nitrogen gas supply source consisting of a plurality of nitrogen cylinders 11 is connected to a portion of the supply pipe line 9 between the electromagnetic valve 10 and the blowing pipe 3 via a nitrogen gas supply control electromagnetic valve 12 .

An exhaust port 14 is provided in a lid 13 detachably attached to the upper part of the fish cooling tank 1, and a discharge pipe 1 connects the exhaust port 14 with the air inlet of the compressor 8.
5 is connected to an intake air control solenoid valve 16, and a temperature sensor 17 for detecting the temperature inside the fish storage tank 1 is attached to the middle part of the side wall of the fish storage tank 1 in the height direction. 17 is a meter relay 18 comprising a lower limit temperature activation relay _R1 that operates when the detected temperature reaches a predetermined low temperature and an upper limit temperature activation relay _R2 that operates when the detected temperature reaches a predetermined upper limit temperature. The meter relay 18, the power supply operation circuit for the electric motor 7, and each electromagnetic valve 10, 12 are further connected to a control panel 19.

When refrigerating fish in the fish refrigeration device of the above embodiment,
First, water and ice are stored in the fish refrigerator tank 1, and then the nitrogen gas supply control solenoid valve 12 is closed, the air supply control solenoid valve 10 is opened, and the compressed air from the compressor 8 is routed through the supply pipe. 9 and blow pipe 3
through the air outlet 2 into the fish cooling tank 1,
The blown air stirs the water and ice in the fish refrigerator tank 1, and after the water temperature (average water temperature) in the fish refrigerator tank 1 falls to a predetermined lower limit temperature, the operation of the compressor 8 is stopped and air is supplied. Control solenoid valve 1
Close 0.

Next, after putting the fish 20 into the fish cooling tank 1, the nitrogen gas supply control solenoid valve 12 is opened, and the nitrogen gas from the nitrogen cylinder 11 is passed through the supply pipe line 9 and the blowing pipe 3 to the blower outlet 2. Nitrogen gas is blown out into the fish cooling tank 1, and the fish, water, and ice in the fish cooling tank 1 are stirred by the blown nitrogen gas to uniformly cool the fish and water.

Next, when the water temperature in the fish cooling tank 1 falls to a predetermined lower limit temperature, the lower limit temperature is detected by the temperature sensor 17, and the lower limit temperature activation relay _R1 in the meter relay 18 is activated by the signal from the temperature sensor 17. , the signal from that relay is sent to control panel 1
9, and the nitrogen gas supply control solenoid valve 12 is closed in response to a command from the control panel 19.

Further, when the water temperature in the fish cooling tank 1 rises to a predetermined upper limit temperature, the upper limit temperature is detected by the temperature sensor 17, and the upper limit temperature activation relay R ₂ in the meter relay 18 is activated by the signal from the temperature sensor 17. The signal from that relay is control panel 1
9, the nitrogen gas supply control solenoid valve 12 is opened in response to a command from the control panel 19, and stirring is performed again by blowing out nitrogen gas. If there is not, a command is issued from the control panel indicating that there is insufficient ice as a cooling heat source. After receiving the command and adding ice to the fish refrigerator tank 1, stirring is performed once again by blowing out nitrogen gas. By repeating the above steps, automatic temperature control within the fish cooling tank 1 is performed.

As mentioned above, by stirring the ice and water in the fish cooling tank 1 by blowing air before putting the fish into the fish cooling tank 1, the amount of nitrogen used can be reduced.

Figures 5 to 11 show other examples of the nitrogen gas blow-off section, and in the case of the first example shown in Figures 5 to 7, a pair of straight portions extending in the width direction of the hull are shown. A plurality of stainless steel blowing pipes 3 are placed side by side on the bottom of the fish cooling tank 1, and the curved portion of each blowing pipe 3 is connected to the supply pipe line 9. , lightweight concrete or other hardenable material 21 is cast, the hardenable material 21 fixes each blowing pipe 3, and the hardenable material 21 and each blowing pipe 3 form a substantially flat upper surface. A blowing unit 4 is constructed.

In the case of the second example shown in FIGS. 8 and 9, a plurality of linear blowing pipes 3 each having a large number of blowing outlets
is placed on the bottom of the fish cooling tank 1, and one end of a vertical supply pipe 23 is fixed to one end of the blowing pipe 3, and a coupling 24 is attached to the other end of the vertical supply pipe 6. A supply line 9 is connected thereto.
In the second example, the L-shaped blowing unit 4 consisting of the blowing pipe 3 and the vertical pipe 23 can be easily taken in and out from the opening 25 at the top of the fish storage tank.

In the case of the third example shown in FIGS. 10 and 11, a pair of holding members 2 are pivotally connected by a pin 26.
7, one end of the linear blow-off pipe 3, each having a large number of blow-off ports 2, is fixed to form a foldable blow-off unit 4, and the blow-off unit 4
Each blowing pipe 3 in is connected to the supply pipe 9 via a connecting pipe 28 . In the case of the third example, the blowing unit 4 can be folded and easily put in and taken out from the opening 25 at the top of the fish cooling tank 1.
Moreover, after being accommodated in the fish refrigerating tank 1, it can be unfolded and placed on the bottom of the tank.

[Effect of idea]

According to this invention, a blowing pipe 3 having a large number of blowing ports 2 is provided at the bottom of a fish refrigerating tank 1 in which fish, water and ice are housed together, and the blowing pipe 3 is connected to a supply pipe 9. A solenoid valve 1 for air supply control is connected to the discharge port of the compressor 8 via the supply pipe 9.
0 is interposed, and a nitrogen gas supply source is connected between the solenoid valve 10 and the blowing pipe 3 via a nitrogen gas supply control solenoid valve 12.
The exhaust port 14 at the upper part of the compressor 8 and the suction port of the compressor 8 are connected via the discharge pipe 15. Therefore, when refrigerating fish in the fish refrigerator, water and ice are first stored in the fish refrigerator tank 1. Then, with the nitrogen gas supply control solenoid valve 12 closed, the air supply control solenoid valve 10 is opened, and the compressed air from the compressor 8 is passed through the supply pipe line 9 and the blow pipe 3 to the blowout port 2. The air is blown out into the fish refrigerator tank 1, and the blown air stirs the water and ice in the fish refrigerator tank 1. After the water temperature in the fish refrigerator tank 1 drops to a predetermined temperature, the operation of the compressor 8 is stopped. With,
After closing the air supply control solenoid valve 10 and putting the fish 20 into the fish cooling tank 1, the nitrogen gas supply control solenoid valve 12 is opened to supply nitrogen gas from the nitrogen gas source to the supply pipe. 9 and the blowing pipe 3 from the air outlet 2 into the fish cooling tank 1, and the blown nitrogen gas can agitate the fish, water, and ice in the fish cooling tank 1, thereby reducing the amount of nitrogen used. The fish and water can be cooled evenly.

Also, due to the dissolution of nitrogen gas at the gas-liquid contact surface between the water in the fish storage tank 1 and the nitrogen gas blown into the water from the blowing pipe 3, and the diffusion of dissolved oxygen in the water, while removing dissolved oxygen in the water, By stirring the ice, water, and fish, it is possible to refrigerate the entire fish in the fish refrigerator tank 1 almost uniformly, and as a result, there is almost no rancidity of fish fat or deterioration of texture due to reaction with oxygen. , there is almost no discoloration due to oxidation of the fish's skin and scales, and the respiration of the fish is also suppressed, so the fish can be refrigerated without reducing its freshness, and nitrogen gas is odorless, colorless, and completely toxic. Since there is no oxidation, it is safe and other benefits can be obtained.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of this invention, in which Figure 1 is a partially longitudinal front view of the fish refrigeration device, Figure 2 is a plan view of the blowing unit, and Figure 3 is its FIG. 4 is a partially cutaway enlarged cross-sectional view and a plan view showing a state in which a plurality of blowing units are installed at the bottom of the fish cooling tank. Fig. 5 is a longitudinal sectional front view showing the blow-off unit of the first example installed at the bottom of the fish cooling tank, Fig. 6 is a plan view of the blow-off unit of the first example, and Fig. 7 is a part of the blow-off unit. It is an enlarged vertical side view showing. FIG. 8 is a longitudinal sectional front view showing a state in which a plurality of blow-off units of the second example are installed at the bottom of a fish cooling tank, and FIG. 9 is a cross-sectional plan view of the blow-off units of the second example. FIG. 10 is a longitudinal sectional front view showing a state where a plurality of blow-off units of the third example are installed at the bottom of a fish cooling tank, and FIG. 11 is a partially cutaway front view showing the blow-off unit of the third example in a folded state. In the figure, 1 is a fish cooling tank, 2 is an air outlet, 3 is a blowing pipe, 4 is a blowing unit, 6 is a fish carrier, 8 is a compressor, 9 is a supply pipe, 11 is a nitrogen cylinder, and 12 is a nitrogen gas supply control. 15 is a discharge pipe, 17 is a temperature sensor, 18 is a meter relay, and 19 is a control panel.

Claims (1)

[Scope of utility model registration request] A blowing pipe 3 having a large number of blowing ports 2 is provided at the bottom of the fish refrigerating tank 1 in which fish, water, and ice are stored together. connected to the discharge port, and the supply pipe line 9
A solenoid valve 10 for air supply control is interposed, and a nitrogen gas supply source is connected between the solenoid valve 10 and the blowing pipe 3 via a solenoid valve 12 for nitrogen gas supply control. upper exhaust port 14
and the suction port of the compressor 8 is the discharge pipe 15.
A fish refrigeration device using nitrogen gas, characterized in that the device is connected via a nitrogen gas refrigeration system.