JPS63151596A - Catamaran - Google Patents

Abstract

PURPOSE:To make a high speed navigation of the catamaran in the caption possible during navigation on smooth water by providing an air chamber at the outside of each single shell, an opening hole portion at the lower end of said chamber and a vent tube at the upper end, having a three way valve which can freely change over the connection from said chamber to the atmosphere or to a compressed air generating device located in a vessel. CONSTITUTION:In the case of navigation on smooth water, three way valves 6 are set to connect air chambers 3 to compressed air generating chambers 7 for supplying compressed air to the air chambers 3 to discharge ballast water such as sea water staying in the air chambers 3 from opening hole portions 4 to outside. As the result, the air chambers 3 work as floating tanks to float a vessel body 1 so much. Under this condition, if a propelling device is driven to increase speed, the vessel body 1 comes in a gliding condition because the bottom face of each single shell works as a gliding face. Accordingly, the vessel body 1 gets further floating and the opening hole portions 4 are exposed above the surface of the water so that the sea water does not flow into the air chambers 3. Therefore, the operation of the compressed air generating device 7 is stopped at this moment. Like this, the vessel body 1 glides on the surface of the water so that a high speed navigation becomes possible by a small horse power.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a catamaran hull form and a sway reduction device.

[Conventional technology]

The following catamarans have been in practical use:

(1) Conventional catamaran (2) Semi-sliding catamaran (3) Semi-submersible catamaran [Problems to be solved by the invention] The above-mentioned conventional techniques include the following. There was a problem.

(1) Conventional catamaran ■Unable to sail at high speed.

■There is a lot of agitation in the waves.

(2) Semi-sliding catamaran ■Although it can sail at higher speeds than conventional types, the maximum speed currently in practical use is 35 knots, which is the limit.

■There is a lot of agitation in the waves.

(3) Semi-submersible catamaran ■Speed is about the same as a semi-submerged catamaran.

■It has excellent sway performance in waves, but requires a control device to control its attitude during navigation. If this breaks down, the ship will only be able to sail at low speeds.

■Since the displacement is small, lightweight structures and materials are required, resulting in high costs.

In addition to the above, there are high-speed catamarans for racing. Although it has a fast running speed in flat water, it can cause phenomena such as pounding or jumping up onto the water surface when there is a slight wave, and its sway performance in waves is extremely poor.

[Means to solve the problem]

This invention was made to solve the above-mentioned problems, and in a catamaran in which the bottom surface of each single hull forms a planing surface, an air chamber is provided on the outside of each single hull, and the bottom surface of each single hull forms a planing surface. Provided is a catamaran in which an air chamber has an opening at its lower end and a ventilation pipe at its upper end which has a three-way valve that can arbitrarily switch the connection between the air chamber and the atmosphere or a compressed air generator installed inside the ship. It is something to do.

[Effect]

When navigating in calm water, the three-way valve is set so that the air chamber and the compressed air generator are ventilated, and compressed air is sent to the air chamber. As a result, the water ballast such as seawater in the air chamber is pushed out through the opening, so the air chamber acts as a buoyancy tank, and the ship floats considerably. When the propulsion device is driven in this state to increase speed, the bottom surface of the single hull acts as a sliding surface, causing the hull to be in a sliding state, allowing high-speed cruising with low horsepower. Also, at this time, the hull rises and the opening of the air chamber is above the water surface, so
Operation of the compressed air generator can be stopped.

When navigating in waves, a three-way valve is set to allow ventilation between the air chamber and the opening that connects to the atmosphere.

Therefore, a compressed air generator is not used; in this case, the air chamber does not act as a buoyancy tank, and seawater etc. freely enter and exit the air chamber through the opening at the lower end. When sailing through waves in this state, the bottom of the single hull forms a planing surface, so the hull rises a little, but it never becomes completely planing, and instead sails in a semi-planing state. Become. Therefore, the maximum speed will be lower than when gliding in a plain, but as the ship sways, seawater, etc. enters and exits the air chamber, and when the phase of this change becomes out of phase with the phase of the ship's sway, a damping force is generated. Both the chamber functions as a conventionally known shell-open-hole type anti-sway tank, and the provision of the air chamber narrows the width of the waterline of the single shell, resulting in a reduction in restoring force. For this reason, it can exhibit a superior effect in reducing vibration compared to conventional catamarans.

(Example) An example of the present invention will be explained based on FIGS. 1 to 3.
The catamaran l of the present invention has each hull 1p12, an air chamber 3 installed on the outside of each monohull 2, an opening 4 at the lower end of the air chamber 3,
It consists of an aperture 5 at the upper end of the air chamber 3, a three-way valve 6 provided in the aperture 5, and a compressed air generator 7 connected to the three-way valve 6 through piping. In addition, three-way valve 6
By switching the valve, it can be vented to the atmosphere.

Next, the operation of the catamaran 1 will be explained. First, when traveling in calm water, the three-way valve 6 is set so that the air chamber 3 and the compressed air generator 7 are ventilated. Then, compressed air is supplied to the air chamber 3, and water ballast such as seawater in the air chamber 3 is discharged to the outside through the opening 4. As a result, the air chamber 3 acts as a buoyancy tank, allowing the hull to float considerably. When the propulsion device of the catamaran 1 is driven in this state and the speed is increased, the bottom surface of each IrI2 acts as a sliding surface, so that the hull enters a sliding state. When the boat shifts to a planing state, the hull further rises and the openings 4 come out above the water surface, so seawater etc. no longer flow into the air chamber 3. Therefore, the compressed air generator 7 stops operating at this point.0 As described above, the catamaran 1 can glide on the surface of the water in calm water, so it can travel at high speed with a small amount of power. .

Next, when navigating through waves, first turn on the three-way valve 6.
The air chamber 3 is set so that the aperture 5 and the atmosphere are ventilated.

In this case, as a matter of course, the compressed air generator 7 is not operated. Therefore, the air chamber 3 does not act as a buoyancy tank, and seawater etc. can freely enter and exit through the opening 4. When sailing through waves in this state, the bottom of the monohull 2 forms a planing surface, so the hull rises a little, but does not become completely planing, and ends up sailing in a semi-planing state. Become.

Therefore, although the maximum speed is lower than when gliding on a flat tree, the air chamber 3 acts as a vibration reduction tank.
Further, by providing the air chamber 3, the width of the single hull at the water surface is inevitably narrowed, and the restoring force is therefore reduced.This synergistic effect makes it possible to reduce oscillation in waves.

〔Effect of the invention〕

The catamaran of the present invention can run at higher speeds in flat water than conventional catamarans, and can also exhibit a better effect of reducing sway than conventional catamarans even in waves.

[Brief explanation of the drawing]

FIG. 1 is a side view of the catamaran of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along line AA in FIG. 2. 1... Main hull of a catamaran, 2... Monohull, 3... Air chamber. 4... Opening part at the lower end of the air chamber, 5... Opening part at the upper end of the air chamber 6... Three-way valve, 7... Compressed air generator, patent applicant Nippon Steel Tube Co., Ltd.

Claims (1)

[Claims] In a catamaran in which the bottom of each monohull forms a planing surface,
An air chamber is provided on the outside of each single hull, and the lower end of the air chamber has an opening, and the upper end has a three-way valve that can arbitrarily switch the connection between the air chamber, the atmosphere, or a compressed air generator installed inside the ship. A catamaran characterized by having a ventilation pipe arranged therein.