JP2695709B2 - Air cushion boat with seal up and down movable device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a painting seal movable up and down apparatus
It relates to an cushion boat .

[0002]

2. Description of the Related Art As shown in a longitudinal sectional view and a transverse sectional view of FIG. 3, a side-wall type air-cushion boat has an air-cushion chamber 4 having four sides surrounded by side walls 1, a bow seal 2 and a stern seal 3. A high-pressure air is sent through a guide vane 5 by a levitation fan 6 to float the hull slightly above the water surface and sail. At that time, in order to reduce the pressure change due to the change in volume of the air cushion chamber 4 due to the waves, the air cushion chamber air is discharged to the outside of the boat by the air discharge louver 7 so as to reduce the vertical acceleration due to the waves. I have.

However, this type of vehicle has the following disadvantages. (1) The vertical acceleration of the hull is changed according to the change in the volume of the air cushion chamber based on the rise and fall of the wave surface on the lower surface of the air cushion chamber due to the encounter wave.
However, this does not sufficiently reduce the vertical acceleration, and the ride comfort is still not significantly improved. (2) The air blown by the floating fan 6 into the air cushion chamber 4 to reduce the vertical acceleration is discharged from the air release louver 7 to the outside of the boat by a variation of the wavefront.
The floating fan horsepower is uneconomical due to large energy loss.

(3) In order to provide the discharge louver 7, a duct having the same strength as the conventional hull structure of the ship is guided from the cushion room 4 to the outside of the ship, and the weight is increased due to discharge to the atmosphere. Further, since high-pressure air is discharged to the atmosphere via the duct and the louver, the air resistance is large and the opening area of the duct and the louver is required to be large. (4) Further, since the louvers are usually installed on the side of the hull and on the upper deck, it is not preferable in terms of the hull strength, and reinforcement and the like are required, and the weight increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and is an economical air- equipped with a vertically movable seal for improving ride comfort, reducing weight and reducing fuel consumption.
It is intended to provide a cushion boat .

[0006]

Means for Solving the Problems To achieve this, the sheet of the present invention is used.
The air cushion boat equipped with a vertical movable device has vertical side walls whose lower ends are submerged on both sides of the bottom of the boat , and the front and rear end openings of the side walls are closed with flexible bow seals and stern seals, respectively. In an air cushion boat having an air cushion chamber formed between the bottom of a ship and the water surface, the pressure in the air cushion chamber is detected during cruising, and a seal is provided via a reinforcing material of the stern seal according to the change in the pressure. The entire bottom of the lumber
The pressure in the air cushion chamber is maintained substantially constant by raising and lowering the net-like member laid on the air cushion chamber.

[0007]

[Function] In a normal air cushion boat, when sailing in waves, encounter waves cause the capacity of the room to change due to encounter waves, causing pressure fluctuations, which increases the vertical acceleration of the hull. According to the invention, when the pressure in the air cushion chamber increases, the stern seal is slightly lifted by a hydraulic cylinder to release air to the atmosphere, lowering the pressure in the air cushion chamber, and reducing the pressure in the air cushion chamber when the pressure in the air cushion chamber decreases. By lowering the pressure and maintaining the pressure in the air cushion chamber, the pressure in the air cushion chamber can be kept substantially constant, and the riding comfort can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a stern seal, and FIG.
It is a perspective view of. In the above figure, the same reference numerals as those in FIGS. 3 and 4 denote the same members as those in the same figure, and 11 denotes a hydraulic cylinder which stands upright in the stern hull and moves up and down the lower end of the stern seal 3 via the wire 10. Reference numerals 22 denote electromagnetic switching valves which are inserted on the discharge side of a hydraulic pump 23 for circulating oil in the oil tank 10 and which raise and lower the lower end of the stern seal 3 via the hydraulic cylinder 11 and the wire 10.

In such an air cushion boat, air is sent by a floating fan 6 into an air cushion chamber 4 enclosed by a side wall 1, a bow seal 2 and a stern seal 3, pressurized, and the boat hull floats. Is as usual,
During the sailing, the pressure fluctuation of the cushion chamber occurs due to the encounter wave.

However, in this embodiment, when the air cushion chamber is pressurized by the encounter wave during navigation, the pressure sensor 20 in the air cushion chamber 4 detects the pressure and the hydraulic pump 22 The pressure oil from 23 is introduced into the lower pressure chamber of the hydraulic cylinder 11, the piston is pushed up and the stern seal 3 is
To discharge high-pressure air to the outside from between the lower end of the stern seal 3 and the water surface.

Here, the entire stern seal 3 is formed of a flexible film material, and its internal spaces A, B, and C are always at a pressure slightly higher than the specified pressure of the air cushion chamber 4. Therefore, if only the stern seal 3 made of a flexible film material is used , even if the lower end portion of the stern seal 3 is moved up and down, only that portion fluctuates, which is not preferable in strength.

Therefore, the entire bottom surface of the stern seal 3 is
A net-shaped member 8 is provided, and the front end of the net-shaped member 8 is
It is fixed to the hull with 12, 13, 14 and bolts
You. Also, because of the need for lifting strength, the rear end of the net-shaped member 8
Is connected to a reinforcing member 9.
It is connected to a cylinder 11 via a wire 10 so as to be able to move up and down.
ing. When the pressure in the air cushion chamber is reduced, the stern seal 3 is lowered in substantially the same manner as in the case of pressurization to prevent air leakage.

[0013]

In the conventional air cushion boat, the pressure fluctuation in the cushion chamber due to the encounter wave is caused by a duct and a louver which causes an increase in weight and has a large resistance coefficient. In the present invention, this is performed through a hydraulic cylinder or the like. By using the stern seal, the weight of the duct, the louver, etc. can be reduced, and the weight of the hull reinforcing member by providing a large opening in the hull outer plate can be reduced. Also, when inspecting for damage to the stern seal, it is very convenient because the stern seal can be checked simply by raising the stern seal without docking the hull.

In short, according to the present invention, longitudinal side walls whose lower ends are submerged are provided vertically on both sides of the ship bottom, and the front and rear end openings of the side walls are closed with flexible bow seals and stern seals, respectively. In an air cushion boat having an air cushion chamber formed between the bottom of a ship and the water surface, the pressure in the air cushion chamber is detected during cruising, and a seal is provided via a reinforcing material of the stern seal according to the change in the pressure. The entire bottom of the lumber
By raising and lowering the net-shaped member laid in the air cushion chamber, the pressure in the air cushion chamber is kept almost constant, thereby improving the riding comfort, reducing weight and reducing fuel consumption. Therefore, the present invention is extremely useful in industry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a stern seal according to an embodiment of the present invention.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a longitudinal sectional view showing a known side wall type air cushion boat.

FIG. 4 is a sectional view of FIG. 3;

[Description of Signs] 1 Side wall 2 Bow seal 3 Stern seal 4 Air cushion chamber 6 Floating fan 8 Net-like member 9 Reinforcement material 10 Oil tank 11 Hydraulic cylinder 12, 13, 14 Mounting material 20 Pressure sensor 21 Computer 22 Electromagnetic switching valve 23 Hydraulic pump

Claims (1)

(57) [Claims] 1. Vertically extending side walls whose lower ends are submerged are provided on both sides of a ship bottom, and front and rear end openings of the side walls are closed with flexible bow seals and stern seals, respectively. In an air cushion boat having an air cushion chamber formed therebetween, the pressure in the air cushion chamber is detected during the voyage, and the stern seal is supplemented in accordance with a change in the pressure.
Net-like member laid on the entire bottom of the sealing material via a strong material
Characterized by keeping the pressure in the air cushion chamber almost constant by raising and lowering the air.
Cushion boat .