JPS61234726A - Hollow float - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Field of Application of the Invention) This invention relates to an improvement of a hollow body float used for floating nets or ropes in water, and is suitable for use in fish cages, oyster and scallop farming facilities, etc. It is suitable as a float.

(Prior Art and Problems to be Solved) Conventional floats used in fisheries or facilities for cultivating oysters, scallops, etc. are hollow and sealed, and have the required buoyancy and are designed to maintain the water depth at which they are normally used so as not to be destroyed by water pressure. Those with suitable pressure resistance are used.

By the way, for fish farming, for example, as shown in Fig. 5, a raft 21 is constructed of steel pipes, this is floated on the water surface using a floating box 22, and a refining cage 23 is hung from this raft.
An anchor fixed to the bottom of the water with an anchor rope 24 is usually used, but in case of rough weather and high waves or when the water surface is polluted, the cage 23 is covered with a net and the cage 2 is attached to the raft 21.
3 are submerged deep into the water to prevent them from being shaken by waves, or to protect fish and shellfish from contaminated water on the surface.

In this case, if the float 22 is sunk deep into the water, the water pressure acting on the float 22 will increase in proportion to the depth, but since the internal pressure of the float is constant, the water pressure will deform or destroy the float 22. The depth is also limited, and if a float with a high pressure resistance is used from the beginning, the equipment cost will be undesirable.

Furthermore, as shown in FIG. 6, in a scallop aquaculture facility, in order to suspend the girder rope 26 with the hanging IM 25 attached at a predetermined water depth, in addition to the water surface float 27, an intermediate float 28 placed in the water is used to suspend the girder rope 26. It is maintained at a substantially uniform depth over its entire length, and is fixed to the bottom of the water by an anchor rope 29.

In this case as well, for example, during stormy weather, it may be necessary to submerge the seedlings or the growing device deeply in the water to protect them from shaking caused by waves and prevent young shellfish from adhering to them or falling off the growing device. 27 may be destroyed by water pressure.

In view of the above, an object of the present invention is to provide a float that will not be destroyed by water pressure even if the water depth in which it is used changes, or in other words, even if the water pressure acting on the float changes.

(Means for Solving the Problems) This invention provides a hollow float used for floating underwater facilities such as fish farming or shellfish farming, in which a through hole for pressure balance is provided on the lower side of the float. The present invention relates to a hollow body float characterized in that water flows in and out of the float through the pressure balancing hole in accordance with the water pressure acting on the float, thereby balancing the internal and external pressures of the float.

(Example) Next, embodiments shown in the accompanying drawings will be described.

In Fig. 1, which shows an example in which the hollow body float is an ellipsoid, the hollow body float 1 is made of a common material such as plastics or reinforced plastics according to the required performance, and is made of a girder rope or a hanging rope. It has a mounting part 3 provided with a hole 2 for the mounting. A through hole 5 for pressure balancing is provided at the bottom of the wall 4, which will be under the float when the float is attached.

Figure 2 shows an example in which the upper half 6 of the hollow body 1a is spherical and the lower half is an inverted cone, and the bottom 8 of the inverted cone is provided with a through hole 5 for pressure balance. The line 8 is, for example, a hanging line or an anchor line.

FIG. 3 shows an example in which a through hole 5 for pressure balancing is provided at the bottom of the hollow body 1b, and an air valve 9 is provided at the top.

(Function) As shown in Figure 1, if the float 1 is attached to a girder or raft with the through hole 5 facing down, water will flow into the hollow body 1 through the through hole 5, and the gas pressure inside the hollow body will increase. P1 is water pressure P2
The water surface reaches a height that is balanced by , and the inflow stops.

When the float is floating on the water surface, ignoring the weight of the float, PI = p2, which is much equal to the external pressure P3, that is, the atmospheric pressure P.

In addition, when the float is deeply submerged in water, the diameter or height of the float can be ignored compared to the water depth, so the water pressure P3 acting on the outer surface of the float becomes P3 = P2, and therefore P3 = pm, and the wall of the float The difference between the internal and external pressures acting on the body, P3-P, is always constant regardless of the water depth and is close to zero. Therefore, the wall of the float only needs to have enough strength to withstand buoyancy under atmospheric pressure and shock and friction during use.

For example, when towing an aquaculture facility, the float 1a having the inverted conical lower half shown in FIG.
Even if a becomes oblique to the water surface, the buoyancy will not change because the gas inside the hollow float 1a will not leak out until the angle α of the cone with respect to the horizontal line becomes practically zero. convenient. In addition, instead of making the lower half an inverted conical shape, the same effect can be obtained by attaching a cylinder of an appropriate length to the outside of the through hole at the bottom of the ellipsoid or sphere and protruding so as to communicate between the inside and the outside. can get.

Furthermore, the float 1b shown in Figure 3 has an air valve 9 at the top, so when installing it on a raft or when attaching a girder, the air inside the float 1b can be appropriately released and water replaced. ,
Adjust the buoyancy by reducing the volume of air, make the work easier by keeping the float submerged above the water surface, and close the air valve 9 after work is completed.
The buoyancy can be restored by pumping air into the float 1b from the float 1b, or when sinking cages, aquaculture facilities, etc. deep into the water during stormy weather, it is easier to remove the gas from the float 1b to reduce the buoyancy. or reduce the influence of waves.

(Effects) As described above, the hollow body float of the present invention is provided with a through hole for pressure balancing on the lower side, so water enters and exits according to the water pressure and changes the volume inside the hollow body. Since the internal and external pressures of the float are balanced, the float will not be deformed or destroyed by water pressure, and the strength of the float does not need to take into account pressure resistance. Regardless of its simple structure, it is sufficient to have sufficient strength, so there is no need to replace the float depending on the water pressure used, or it is easy to adjust the buoyancy of the float, making it easy to absorb vibrations caused by waves. The practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a partially broken sectional view showing one embodiment of the present invention, and FIG.
The figure is a partially fragmented sectional view showing another embodiment, FIG. 3 is a sectional view showing another embodiment, and FIG. 4 is a diagram for explaining an example of the usage state of the embodiment shown in FIG. The partially broken sectional view and FIGS. 5 and 6 are elevational views showing examples of how to use the hollow body float. DESCRIPTION OF SYMBOLS 1... Hollow body float, 2... Mounting hole, 3... Mounting part, 4... Lower wall of float, 5... Pressure balance through hole, 6... Floating top Half part, 7... floating lower half part, 8.
... Tsuna, 9 ... Air valve applicant's agent Patent attorney Kamoshi 1) Second son Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] In a hollow body float used for flotation of facilities such as fish farming or shellfish cultivation, a through hole for pressure balancing is provided on the lower side of the float, and the pressure is adjusted according to the water pressure acting on the float. A hollow body float characterized in that water flows in and out of the float through a balancing hole so that the internal and external pressures of the float are balanced.