RU2466052C1 - Twin-hull vessel for marine geophysics - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to lights off-shore navigation ships for purposed of marine geophysics. Proposed vessel comprises two hulls, each being made up of three sections mounted on common frame truss. Central sections represent solid hull equipped with engines and screw propellers that can up and down relative to truss frame to coast in shoaling water.

EFFECT: better controllability and higher safety.

3 cl, 8 dwg

Description

Introduction

The present invention relates to the field of technical support for offshore exploration, namely, to light watercraft for coastal navigation for marine geophysics performed by a catamaran.

Known motor catamaran "Elan 12" (www. Intelligent.lv), containing two durable hull with an outboard motor in the stern on each hull. In relation to the tasks of marine geophysics, the disadvantage of this catamaran is the difficulty of transporting it to the place of work because of the impossibility of loading the catamaran in a standard container.

Known catamaran for marine geophysical work in the coastal zone "GEO-25" (www.alumlodka.ru), the floating hulls of which are inflatable, so that the catamaran is adapted for transportation in a standard container. The catamaran is equipped with one engine and only one screw on the rotary column in the stern; as a result, the catamaran has insufficient maneuverability for quick and accurate exit to a given point in the geophysical profile. In addition, for the geophysical catamaran, it is desirable to have the same walking speed and maneuverability of movement in both forward and reverse gears, since it is convenient to fold the braid while moving forward and to raise it - when reversing. The location of the screw in the stern does not provide this possibility, including because of the danger of winding the braids on the screw.

In order to manage and maneuver well when moving both forward and backward, in the catamaran for marine geophysics, screw propellers should be located as close as possible to the middle transverse axis of the catamaran (midship) and have independent control of rotation speed and reverse. In this case, the catamaran, for example, can rotate in place if one mover is turned forward, and the other is turned back. In addition, it is desirable that the screws can be removed inside the case, at least partially retaining their traction and the ability to move in conditions of extreme shallow water.

Known catamaran according to the patent of the Russian Federation No. 2270131 (prototype), in which the floating hulls are assembled from separate sections, and screw propellers are located between the sections with the possibility of cleaning inside the hulls. The catamaran according to patent No. 2270131 is intended for installation of a car on it. The disadvantages of the catamaran of this patent, from the point of view of application for marine geophysics:

1) The location of the propeller thrusters depends on the placement of the driving wheels of the car on the catamaran, which does not substantially coincide with the midship of the catamaran. With the declared purpose of the catamaran, the midsection should be, if possible, under the center of gravity of the car.

2) Drive propulsion from the drive wheels of the car virtually eliminates the ability to control a catamaran due to separate control in the "gas-reverse" mode of each propulsion.

3) The movers are cleaned inside the hull by turning them in a longitudinal vertical plane, and when the mover is completely retracted into the hull, it is impossible to even partially retain its thrust in the direction necessary for the movement of the catamaran.

The aim of the invention is to remedy these disadvantages. This goal is achieved in that a catamaran containing two assembled from separate sections of the floating hull and screw propellers installed between sections of the hull with the possibility of cleaning inside the hull, each floating hull consists of three sections mounted on a common frame, the middle section of each floating hull is installed with the possibility of vertical plane-parallel motion relative to the frame and made in the form of a robust housing with the ability to access the internal cavity in which the stationary motor is placed a body with a mechanical transmission of a drive of a screw propulsion device located outside a durable housing.

To provide the necessary rigidity, the frame of the catamaran can be made in the form of a truss, which at the same time serves as a guard rail for the deck of the catamaran.

To increase the safety of swimming on the outer side sides of the frame, made in the form of a truss, one or two additional sections that are identical to the extreme sections of the floating body can be fixed.

List of figures

Figure 1. Catamaran, side view.

Figure 2. Catamaran, view from above.

Figure 3. Catamaran, front view.

Figure 4. Catamaran with raised propellers to their highest position.

Figure 5. Catamaran with raised propellers for movement in extreme shallow water.

6. Catamaran with additional floating sections side view.

Fig 7. Catamaran with additional floating sections top view.

Fig 8. Catamaran with additional floating sections front view.

Technical description

The floating hulls of the catamaran in figure 1 consist of the extreme sections 1, 2 and the middle section 3. The extreme sections can be inflatable. The middle section is made in the form of a steel box, inside of which the engine is located, and on the outside there is a screw propeller 4 connected mechanically to the engine. The middle section can be raised and lowered by a winch 5 in the guides 6, which are fixed on the frame 7 and at the same time serve as one of the racks of the awning 8. The extreme sections 1, 2 of the floating body are rigidly connected to the frame 7, which is made in the form of a truss. The frame 7 simultaneously serves as a guard rail for the deck 9 of the catamaran. Sections 1, 2, 3 are located relative to the frame 7 so that the mover 4 is located near the middle transverse axis of the catamaran (midsection). The dimensions of the extreme sections 1, 2 and the middle section 3 are selected so that section 3 in the main working position does not protrude beyond the dimensions of sections 1, 2 and does not create additional hydrodynamic resistance during movement.

Figure 4 shows the extreme upper position of section 3, in which the screws and engines are serviced, as well as their installation and dismantling.

Figure 5 shows the position of the section 3, in which the screws do not protrude down beyond the dimensions of the extreme sections 1, 2, but remain immersed in water and partially retain their traction capabilities.

The catamaran can be equipped with two or four additional sections identical to sections 1, 2. FIGS. 6, 7, 8 show the placement of four additional sections on the frame of the catamaran. Additional sections create an additional margin of stability of the catamaran against tipping over and serve to quickly replace the main sections on water in case of damage.

Operating principle

In the working position (Fig. 1), the middle sections 3 of the catamaran floating hulls are lowered to the lowest position, the screw propellers 4 are immersed in water to a sufficient depth to create full thrust. In this position, the draft of the catamaran in the cargo is slightly less than the middle of the extreme sections 1, 2. The catamaran is controlled by independently changing the speed and reverse of the screws 4.

If necessary, sections 3 with the help of winches 5 can be raised to their highest position (Fig. 4), in which access to the screws 4 is opened, for example, in order to free the screws from wound foreign objects. In this position, you can also remove the removable side and top walls of section 3 and gain access to the engines for maintenance.

For movement in extreme shallow water, sections 3 are set to the position shown in FIG. 5. In this position, sections 3 rise from the water and lose their lifting force, the catamaran draft increases, the screws 4 remain immersed in water and partially retain their traction capabilities and do not protrude downward beyond the dimensions of sections 1, 2, i.e. are in the shadow of these sections. This mode can also be useful when there is an abundance of algae and when the geophysical spit is under the catamaran.

If sections 1, 2 of the floating hulls are inflatable, then there is a high probability of their puncture. Seal the damaged place only in the air, removing the section from the catamaran. If the damage is significant, then there is a danger of significant roll and trim of the catamaran, up to overturning on a wave. To prevent this, additional sections fully equipped for installation can be attached to the catamaran frame, similar to sections 1, 2, as shown in Figs. 6, 7, 8. The sections 1, 2 are attached to the frame so that the section is blown off can be removed on water and replaced also by a deflated spare section by blowing it after installation. If there are spare sections, the dismantling of one section will not lead to catastrophic distortion of the catamaran, since from the moment the additional section is immersed in water, the distortion will stop. In addition, additional sections create an additional margin of stability for the catamaran, which is especially important in marine conditions. Additional sections may not be four, as shown in Fig.6, 7, 8, but only two, one for each side in the middle.

Claims (3)

1. A catamaran containing two assembled from separate sections of the floating hull and screw propellers installed between sections of the hull with the possibility of cleaning inside the hull, characterized in that each floating hull consists of three sections mounted on a common frame, the middle section of each floating hull is installed with the possibility of vertical plane-parallel movement relative to the frame and is made in the form of a robust housing with access to the internal cavity in which a stationary engine with mechanical transmission drive screw propeller disposed outside the pressure hull. 2. The catamaran according to claim 1, characterized in that the frame of the catamaran is made in the form of a truss, which simultaneously serves as a guard rail for the catamaran deck. 3. Catamaran according to claim 1 or 2, characterized in that on the outer sides of the frame are fixed one or two additional sections, identical to the extreme sections of the floating hull.

Images