JPS5811355B2 - semi-submerged boat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-submerged ship that can quickly deal with a trim phenomenon when the ship is traveling at extremely slow speed or when the ship is at anchor.

A semi-submerged ship has a lower hull that accounts for the main part of the displacement and is located below the water surface, an upper hull that is located above the water surface and serves as a passenger, cargo, work platform, etc., and an upper and lower hull that penetrates the water surface. The hull is composed of the connecting supports.

This hull configuration has many features, such as good maneuverability in waves, but the submerged parts of the hull, especially the supports, need to reduce the influence of waves and reduce navigation resistance as much as possible. Because the cross-sectional area is kept to the minimum necessary, the change in buoyancy distribution that occurs when the hull tilts is smaller than that of a normal monohull, in other words, the static restoring force due to buoyancy is extremely small. Therefore, the unbalance of the load inside the ship tends to cause a very large inclination compared to the size of the load.

This tendency shows that when a ship is sailing at a certain speed or higher,
By changing the attitude of the lower hull or by providing fins, it is possible to easily cope with the tilting of the hull by utilizing the large dynamic acting force generated on the hydrofoil surface, but this acting force is caused by the interaction between the hull and the water. It decreases geometrically as the relative speed decreases during that period, so it cannot be expected to have any effect when the ship is at very low speed or at rest.

As a countermeasure for this, conventional ships have trim tanks installed at several locations in the lower hull, and the movement of water in these trim tanks compensates for the inclination of the ship when it is traveling at extremely low speed or when it is at anchor. Was.

However, since the practical permissible flow rate of water is small, its flow capacity becomes a limiting factor, limiting the speed at which water can move from one trim tank to another, resulting in a delay in compensation for the inclination of the hull. was there.

Therefore, for example, when passengers move on or off the ship to board or disembark the ship, it is difficult to cope with the rapid and irregular changes in the load on the ship that occur due to the movement of water in the trim tank. A countermeasure was desired.

Therefore, the present invention was made as a result of intensive research to provide a semi-submerged ship that can quickly cope with the tilting of the ship's hull due to changes in the internal load while the ship is stopped. The practical allowable flow velocity value (typical value is 20 m15 ec) is approximately 10 times the allowable flow velocity value (typical value 2 m15 ec).
Focusing on the gas with This responds to existing demands by quickly adjusting the trim of the hull by increasing or decreasing the buoyancy of the displacement of the section.

Next, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, below an upper hull 1 located above the water surface, a right lower hull 2 and a left lower hull 3 located below the water surface are spaced apart from each other.

The upper hull 1 and the left and right lower hulls 2.3 are connected by support portions 4 and 5, respectively, to constitute six hull elements.

Since the supporting parts 4 and 5 are disposed at positions penetrating the water surface, their cross sections are usually formed in a streamlined shape, and thereby also serve as vertical fins.

On the other hand, the left and right lower hulls 2 and 3 constitute the main part of the displacement and are formed in the shape of a torpedo, and propellers 7 and 8 are attached to the stern sides thereof, respectively.

Further, horizontal wings 9,
10 is extended, and these horizontal wings 9 and 10 can be used for maneuvering and attitude control during navigation of a semi-submerged ship by appropriately moving part or all of them as a horizontal control surface depending on the structure. It is used.

Moreover, longitudinal rudders 11 and 12 are provided on the support part 5 on the stern side of the support parts 4 and 5.

Of the hull 6 constructed in this manner, the lower hull 2.degree. 3 is provided with an elastic outer skin 13 made of an elastic material such as a rubber sheet on its outer surface, as shown in FIG.

The elastic outer skin 13 is airtightly attached to the outer surface of the lower hull 2.3 by bolts, rivets, or the like.

Further, a required number of ventilation holes 14 are bored in a part of the outer surface of the lower hull 2.3 facing the elastic outer skin 13, and the inner surface of the lower hull 2.3 surrounding the ventilation holes 14 is An inner wall 15 having a concave cross section is attached in an airtight manner.

Therefore, this inner wall 15 and below. A cavity 16 is formed between the inner surfaces of the hulls 2 and 3.

The inner wall 15 has one end communicating with the cavity 16 and the other end connected to a pressurizing gas source (not shown), such as a gas compressor, a pressurized gas holder or cylinder, or a device consisting of a combination thereof. A supply pipe 17 is attached.

This supply pipe 17 detects the posture of the semi-submerged ship, that is, the trim status, the floating height, and the gas pressure in the chamber 16 as necessary with an appropriate detector (not shown), and detects these detected amounts. It serves to guide pressurized gas, which is processed by a processing system (not shown) and supplied from the pressurized gas source, into the chamber 16 according to the conditions.

Further, one end of a discharge pipe 18 is attached to the inner wall 15 so as to communicate with the inner wall 15 for releasing the gas accumulated inside the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the outer wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the said inner wall 15. It is being

This drain pipe 18 can also be used as the supply pipe 17 with the help of valves and side pipes, and if there is no problem in releasing pressurized gas, such as compressed air, into the lower hulls 2 and 3, it can be used on the inner wall. By providing an exhaust valve or the like in the exhaust pipe 15, the exhaust pipe 18 can be omitted altogether.

For example, if the hull 6 is tilted to the right due to rapid and irregular changes in the internal load, the right lower hull 2 will sink, but at this time a detector (not shown) will be activated and pressurizing gas will be pumped through the processing system. Pressurized gas from the source is approximately 20m/s
It enters the cavity 16 through the supply pipe 11 at a high flow rate of ec.

The pressurized gas that has entered the cavity 16 passes through the ventilation holes 14 and reaches the inner surface of the elastic outer skin 13, and as the pressurized gas begins to accumulate there, this pressurized gas acts on the outer surface of the elastic outer skin 13. When the pressure exceeds the external water pressure, the elastic outer skin 13
bulges out into the water outside the boat in proportion to its deformability, and forms a space 19 by deforming, for example, to the position shown by the imaginary line in FIG.

Therefore, water is drained by an amount corresponding to the amount of swelling of the elastic skin 13, so the right lower hull 2 floats up and the hull 6
will be restored quickly.

In this way, drainage buoyancy is added to the semi-submerged ship, and an appropriate amount of gas is additionally supplied to the space 19 created by the expansion of the elastic skin 13, and an appropriate amount of gas is discharged. The additional buoyancy brought about can be increased or decreased, so in this way, the pressurized gas expands,
By appropriately distributing the contractible elastic skins 13 in the submerged parts of the semi-submerged ship, the trim of the hull 6 can be controlled by their proper action.

Note that when the ship is running at high speed without requiring additional buoyancy, if the inside of the elastic skin 13 and the interior of the empty chamber 16 are kept under negative pressure, the elastic skin 13 will be in close contact with the lower hull 2.3, which will affect the sailing performance. There is no effect.

In addition, in this actual case, the elastic outer skin 13 is provided on a part of the outer surface of the lower hulls 2 and 3, but for example, as shown in FIGS. An elastic outer skin 13a having a length l may be provided around the entire outer circumference of the position. In this case, the radial tie straps 20 are placed at appropriate positions in order to bulge the elastic outer skin 13a within an allowable limit. It is desirable to provide one.

Further, the elastic outer skin is not limited to being provided on the lower hulls 2 and 3, but may be provided on the submerged portions of the support portions 4 and 5.

On the other hand, it is practical and preferable to use the atmosphere as a gas, but
For example, toxicity, flammability, combustibility,
Even gases that are suffocating can be used as long as recovery equipment and conditions for use are in place.

As described above, the present invention provides an elastic skin on the surface of the submerged part of the ship's hull, and inflates the elastic skin on the sloped side with pressurized gas to control the ship's inclination. Even if the ship is tilted due to a change in the internal load, the attitude of the ship can be quickly controlled from the tilt to the right position.

Moreover, by using gas, the present invention is more economical than conventional ships where attitude control is performed by pouring water into a water tank inside the hull, and the attitude control is performed by pouring water into a water tank. Further practicality can be achieved by using the posture control according to the present invention.

As described above, the present invention has a quick response performance that cannot be obtained with a water tank type hull attitude adjustment system, and has great practical effects.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; Fig. 1 is an overall perspective view of a typical semi-submerged ship, Fig. 2 is an explanatory diagram of the submerged part with a cross section of the main part, and Figs. Another embodiment of the invention, comprising:
3 is a perspective explanatory view showing a state in which the elastic outer skin is bulged, FIG. 4 is an explanatory side cross-sectional view thereof, and FIG. 5 is an explanatory cross-sectional view taken along the line V-V in FIG. 4. DESCRIPTION OF SYMBOLS 1... Upper hull, 2... Right lower hull, 3... Left lower hull, 4, 5... Support part, 13, 13a...
Elastic outer skin.

Claims (1)

[Claims] 1. An elastic outer skin is provided on the submerged surface of the hull, which consists of an upper hull above the water surface, a plurality of lower hulls placed below the water surface, and a support section that connects these upper and lower hulls through the water surface. A semi-submerged ship whose side elastic skin is inflated with pressurized gas to control the inclination of the hull.