JPS5925175Y2 - Air bubble curtain device for raw “A” - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air bubble curtain device for fish cages, in which a large number of small ejection holes are formed on the upper surface of a tubular body formed in an annular shape, and a large number of slightly larger small ejection holes are formed on the lower surface of the tubular body. Pressurized air is introduced into the annular pipe through a check valve operated by a pressure approximately corresponding to the water depth in which the pipe is installed, and the pipe is always placed horizontally near the bottom of the fish tank. It is characterized by the fact that under normal conditions, it supplies low-pressure pressurized air and blows out the air uniformly only from the small ejection holes mainly on the top of the annular tube, creating a weak cylindrical air bubble curtain. It operates to supply oxygen to the water in the fish tank and promote the growth of fish, and in emergencies such as red tide attacks, it supplies high-pressure air and releases numerous jets of air from both the top and bottom of the annular tube. A large amount of air is uniformly ejected from the holes to create a strong cylindrical air bubble curtain, which prevents red tide from entering the cage and effectively stirs the water in the cage to reduce the concentration of red tide. It works to prevent fish from dying by supplying a large amount of oxygen while lowering the air bubble curtain, and is also equipped with a backflow prevention valve to prevent water or seawater from entering the inside of the annular tube when the air bubble curtain device is not in operation. The purpose of this is to prevent small vents from becoming blocked due to the adhesion of shellfish, algae, and other organisms.

The structure and operation of the air bubble curtain device for cages of the present invention will be explained in detail below with reference to the drawings.

Fig. 1 is a plan view showing an embodiment of the annular tube body of the air bubble curtain device for fish cages of the present invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is an illustration of a generally used fish cage. FIG. 4 is a perspective view showing an embodiment, and is an explanatory view showing the operating state of the air bubble curtain device for cages of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a tubular body formed into a circular, elliptical, polygonal, or other annular shape (circular in the illustrated embodiment), and the cross-sectional shape of the tubular body 1 is that of the illustrated embodiment. In this case, the cross-sectional shape is circular, but the cross-sectional shape is not limited to only circular, and can be freely selected from elliptical or polygonal shapes as necessary.

2 is a large number of small ejection holes drilled in the upper surface of the annular tube body 1; 3;
is a small nozzle hole with a slightly larger diameter than the above-mentioned small nozzle holes that are drilled in large numbers on the lower surface, and in the case of the illustrated example, the outer diameter is 76.3.
A tube with a wall thickness of 3.2 mm is formed into an annular shape with a diameter of approximately 1.5 m, with a small nozzle hole of 1 mm in diameter on the upper surface and a diameter of 3 to 3 mm on the lower surface.
The figure shows 32 small nozzle holes of 4 mm each.

Reference numeral 4 denotes a pressurized air supply pipe bent into an arched shape, which is attached so that its both ends are inserted into the annular tube body 1 from the lower surface direction thereof.

Reference numeral 5 denotes a pressurized air introduction pipe which is connected and opened approximately at the center of the pressurized air supply pipe 4, and the other end is connected to a pressurized air source (air compressor) (not shown) via a flexible pipe 6. is connected to.

7 is a check valve installed in the pressurized air introduction pipe 5;
It is adjusted to operate at a pressure approximately corresponding to the water depth in which the pipe body 1 is installed.

8 is a spoke provided on the annular tube body 1; 9 is a flow 1-110 for supporting the tube body 1 is a spoke 8 of the tube body 1;
This is a rope that connects the float 9 and the pipe body 1 to suspend the pipe body 1 at a required water depth so as to keep it horizontal at all times.

In the case shown in the figure, there is only one float 9, but when using a plurality of floats, they are made into a set and connected to the tube body 10 as shown in the figure through several ropes 10 connected together at the upper part. be suspended horizontally at the required water depth.

The explanatory view of FIG. 4 shows a state in which the air bubble curtain device for a fish cage having the structure described above is placed in a fish cage.

Reference numeral 11 in FIG. 4 indicates a fish cage, and in the illustrated embodiment, the fish cage has a diameter of about 6 m and a depth of about 5 m, as shown in FIG.
consisting of a cylindrical fishing net or wire net, and a plurality of floats 12
Approximately 6m long on one side, so that it floats above the water surface.
It is suspended from a strong square raft 13.

Note that 14 in FIG. 4 indicates an air bubble curtain.

Below, first, the operation of the air bubble curtain device for fish cages of the present invention in normal times will be explained.

The pressure of the pressurized air discharged from the air compressor is adjusted to a pressure approximately corresponding to the water depth in which the annular board 1 is laid, and the flexible pipe 6 is
, if the pressurized air is supplied to the annular tube body 1 via the pressurized air introduction pipe 5 and the pressurized air supply tube 4 (however, if water has entered the annular tube body 1 before the start of normal operation, the above adjustment will be necessary). (The pressure is adjusted to a predetermined pressure after supplying pressurized air with a pressure higher than that of the pipe body 1 and draining the water inside the pipe body 1 in advance). It is discharged from a large number of small nozzles 2 provided (a very small portion of the supplied pressurized air is discharged from small nozzles 3 bored on the lower surface),
A cylindrical air bubble curtain as shown in FIG. 4 is formed.

Although the air bubble curtain formed in this way has a weak function as a curtain, some of the bubbles that continuously rise dissolve in the water and constantly replenish the amount of dissolved oxygen in the water in the fish pen, thus making it easier for fish to survive. It has the effect of promoting growth or increasing aquaculture density.

In addition, if the amount of dissolved oxygen in the natural state becomes abundant due to changes in the amount of water flowing due to tidal current flow or the difference between high and low tides due to the environment in which the fish cage is installed, of course the operation of the air bubble curtain device will be temporarily suspended. .

During this period of suspension of operation, the annular pipe body 1 was filled with pressurized air at a pressure approximately corresponding to the water depth in which the pipe body 1 was laid due to the action of the check valve 7 attached to the pressurized air introduction pipe 5. Therefore, it is possible to prevent external water from entering into the pipe body 1.

This prevents water from entering the annular tube body 1 and clogging the small nozzles 2 and 3 due to adhesion of shellfish, algae, or other organisms.

Next, in an emergency such as an attack of red tide, the pressure of the pressurized air discharged from the air compressor is increased to supply high-pressure pressurized air to the annular tube body 1.

The high-pressure pressurized air is distributed through numerous small jet holes 2 on both the upper and lower sides of the tube body 1.
and 3 all at once, forming a cylindrical air bubble curtain that is much stronger than the normal state.

The powerful rising air bubbles of this air bubble curtain effectively stir the water in the fish tank, reducing the concentration of red tide and supplying a large amount of oxygen to prevent fish death. The bubble layer on the surface is very thick and its horizontal movement is centrifugal and strong, so it is effective in preventing red tide from entering the cage.

When the red tide leaves the vicinity of the fish tank, the pressure of the pressurized air supplied from the air compressor is naturally lowered, and the normal operating condition described in the previous section is restored.

Although the above explanation describes an example in which one air bubble curtain device is installed in the fish cage, it is also possible to arrange a plurality of such devices depending on the volume of the fish cage in the same manner. The desired effect can be achieved.

In the air bubble curtain device for fish cages of the present invention having the structure and function described above, the tube body 1 always uniformly distributes air from the entire horizontal nozzle as much as possible regardless of the presence or absence of waves. It blows out to form a normal air bubble curtain, constantly replenishing dissolved oxygen in the water in the fish tank during normal times to promote the growth of fish, and in the event of an emergency when red tide attacks, it prevents red tide from entering the cage. At the same time, it reduces the concentration of red tide in the fish tank to prevent fish death, and also prevents water from entering the annular tube body 1 when the device is out of operation. This is a completely distant relative of the originally stated purpose of preventing blockage of the blowhole.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the annular tube body of the air bubble curtain device for fish cages of the present invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is an illustration of a generally used fish cage. FIG. 4 is a perspective view showing an embodiment, and is an explanatory view showing the operating state of the air bubble curtain device for fish cages of the present invention. The following is a brief explanation of the drawings: 1: Annular pipe body, 2: Small nozzle hole, 3: Slightly large nozzle hole, 4: Pressurized air supply pipe, 5: Pressurized air introduction pipe, 6: Flexible pipe, 7: Backflow prevention valve, 8 Varnish bork, 9: Float, 10: Rope, 11: Fish cage, 12
: Float, 13: Raft, 14: Air bubble curtain.

Claims (1)

[Scope of utility model registration request] Pipe body 1 formed into a circular, elliptical, polygonal or other annular shape
A large number of small ejection holes 2 are provided on the upper surface and a large number of slightly larger small ejection holes 3 are provided on the lower surface, respectively, and the annular pipe body 1 is operated by a pressure approximately corresponding to the water depth in which the pipe body 1 is laid. The pipe body 1 is connected to a set of floats 9 consisting of one or more floats 9 connected together in two parts. It is suspended by a rope 10 and placed horizontally at the bottom of the cage, and when low-pressure air is supplied, air is ejected uniformly mainly from the entire small jet hole 2 on the top surface, and when high-pressure air is supplied, the air is ejected uniformly from the top and bottom. An air bubble curtain device for a fish cage, characterized in that it is provided so that a large amount of air is uniformly ejected from the entire ejection holes 2 and 3 on both sides.