JPS5836277Y2 - fishing hose - Google Patents

Description

[Detailed Description of the Invention] The present invention is particularly applicable to the above-mentioned hose of a so-called fish pump-type fishing device, which transports the catch caught in the net onto the fishing boat from the rear end of the net via the hose. The present invention relates to a fishing hose suitable for application.

Conventional hoses of this type are shown in Figure 1.
It has a double structure consisting of an air rm 2 formed around the outer circumference of a hose 1, an air pipe 3 that guides air to the air room 2, and an air supply hose 4 connected to the air pipe 3.

As shown in FIG. 2, such a hose is used as a suction hose 9 connected via a nozzle 7 and an extensible flexible hose 8 to the rear end of a net 6 towed by a tug 5. When the catch caught by the net 6 is transported onto the fishing boat 12 by the discharge hose 11 via the pump housed in the pump 10 and the pump of the pump drive device, the suction hose 9 may be twisted during towing. , a rotating joint 13 is attached, but since the air hose 4 is connected to the air pipe 3 as shown in FIG. Ta.

In addition, since the suction hose 9 has a much larger weight than the fluid resistance, the towing angle becomes larger than the towing angle of the net 6.
Since the suction hose 9 may fall on top of or below the net 6, it is necessary to add buoyancy to the suction hose 9 to prevent this.
When changing the depth of the net 6, with conventional hoses, it is necessary to adjust the buoyancy by supplying or removing air, which has the disadvantage of being cumbersome to operate, complicated in structure, and expensive. .

The present invention was proposed in view of the above points, and includes a plurality of air rooms made of elastic material on the outer periphery, and the volume of the air rooms is increased sequentially from shallow to deep. The purpose is to provide a fishing hose that is simple in structure, inexpensive, and whose buoyancy is automatically adjusted when the depth changes.

Since the present invention is constructed as described above, the volume of air in the air room changes depending on the external pressure under the sea.
This also changes the buoyancy.

This is due to Boyle's Law, which states that the volume of gas at a constant temperature is inversely proportional to its supply pressure. If you make it larger as you go toward the sea, the buoyancy will automatically adjust even if the depth changes.

Therefore, there is no need to adjust the buoyancy of the hose when changing the depth, and there is no need for an air supply hose unlike the conventional hose, so the structure is simple and inexpensive.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

Reference numeral 21 denotes a hose, and around its outer circumference there are an air tube 22 that holds air at atmospheric pressure in the air, and an air tube 22.
There are multiple air tube covers 23 to protect the
In this embodiment, there are five locations B, C, D, E, along the length direction.
It is located at F.

When the above-mentioned hose is used as the suction hose 9 of a heavy-duty device as shown in FIG. 2, if the absolute pressure in the sea is P and the volume of air in the air tube 22 is V, then P·■=constant.

In addition, as shown in FIG. 4, the drag of the parts B, C, D, E, and F where the hose 21 is attached to the air tube 22 when being towed in the sea is F, the weight is W, the tension is T, and the air inside the air tube 22 is If the buoyant force due to volume is B, the buoyant force is the force generated by the air in the air tube 22, so T=v'i-(W'-B)"-, and each If the volume of air in the air tube 22 is determined, the towing angle θ at each depth will be constant.

In reality, since atmospheric pressure is added to the underwater pressure, the volume of air in each air tube 22 can be determined at a certain depth so as to maintain a constant towing angle, but when the depth changes, each air tube 22 The buoyant force changes depending on the volume of air inside.

FIG. 5 shows the pressure exerted by each air tube 22 at each depth.

Here, point A is the connection point with the float 10 in FIG.

Point G represents the connection point with the flexible hose 8.

In addition, Figure 6 shows the hose 21 at depths of 30 m (solid line) and 50 m (solid line).
m (dotted line) represents the change in buoyancy at each depth when the volume of air in each air tube 22 is determined so as to maintain a certain towing angle.

As is clear from this figure, if the depth of the net 6 in FIG. 2 requires 50 m, the hose 21
If the volume of air inside each air tube 22 is determined so that the towing angle of It is conceivable that the rear end is raised at a considerable mirror angle.

However, even if a depth of 50 m is required, errors in buoyancy can be reduced by determining the volume of air in each air tube 22 so that the towing angle of the hose 21 is constant at 30 m, which is about half the required depth. can do.

FIG. 7a shows the state shown in FIG. 6A, in which the towing angle of the hose 21 is constant.

Also, Figure 7 shows the state of the mouth in Figure 6.
Due to the shallower depth, the pressure decreases and each air tube 2
As the volume of air inside 2 increases, the buoyancy increases, causing the rear part to rise somewhat.

Furthermore, Figure 7C shows the state shown in Figure 6.
As the depth increases, the pressure increases and each air tube 2
Since the volume of air in 2 is reduced, the towing angle becomes larger than in the case of Fig. 7a.

In the case of FIG. 7C, since a stretchable flexible hose 8 is connected between the nozzle 7 and the hose 21, the error in buoyancy is buffered by the flexible hose 8, and the net 6 has no effect. Therefore, by using the hose 21, when changing the depth,
Unlike conventional products, buoyancy adjustment operations such as supplying and removing air are not necessary, and an air supply hose is also not required, so the structure is simple and inexpensive, and many other effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing a conventional hose, Fig. 2 is a schematic configuration diagram of a fish pump type fishing device, Fig. 3 is a partial sectional view showing an embodiment of the present invention, and Fig. 4 is a partial sectional view of a hose. FIG. 5 is a vector diagram of the force acting on each air tube portion, FIG. 5 is a diagram showing the pressure exerted by each air tube at each depth, FIG. 6 is a diagram showing changes in buoyancy of the hose at each depth, and FIG. 7a. b and c are diagrams showing changing states of the hard work device corresponding to a, b and c of FIG. 6, respectively. 21: Hose, 22: Air tube.

Claims (1)

[Scope of utility model registration request] A fishing hose characterized in that a plurality of air chambers formed of a stretchable member are provided on the outer periphery, and the volumes of the air chambers are gradually increased from shallower to deeper.