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Dual cavity air lubrication system

a technology of air lubrication and cavity, which is applied in the direction of waterborne vessels, hydrodynamic/hydrostatic features, hulls, etc., can solve the problems of air lubricating layer collapse at one or both cavities, and achieve the effect of less susceptible to corrosion

Inactive Publication Date: 2019-07-25
SILVERSTREAM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a device that helps to evenly distribute air to two air cavities in a vehicle, even when there are sudden changes in the pressure of the air. This is achieved by using valves that create a back pressure in the air inlet pipe and a drop in pressure across the valves in the branches, which ensures that the pressure at the inlet is always higher than the pressure at the branches. This design also improves the stability of the air flow during vessel roll and heel. The device also keeps the branch pipes short, which saves on space.

Problems solved by technology

This can lead to collapse of the air lubricating layer at one or both of the cavities.

Method used

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  • Dual cavity air lubrication system
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  • Dual cavity air lubrication system

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Embodiment Construction

[0053]FIG. 1 shows a vessel 1 having a length Lv of between 20 m and 500 m, and a width between 5 m and 75 m. The vessel 1 may have a water displacement of at least 10000 ton, preferably at least 50000 ton and is an ocean going vessel. The vessel 1 has a hull 4 with a bow 2, a stern 3, sides 5 a substantially flat bottom 6 and a propeller 10. Air lubricating cavities 7,8 and 7′,8′ that are open in the plane of the bottom 6, are distributed along the bottom 6 to generate a layer of bubbles 9 travelling towards the stern 3, along the flat bottom 6. A single compressor 11 is connected via an air flow splitter to a pair of air cavities 7, 8 for supplying air to a first air cavity 7 and a second cavity 8 of said pair at an hydrostatic pressure inside each cavity at the prevailing draught level of the vessel. The compressor 11, air cavities 7,8 and air flow splitter all are part of a dual cavity air lubrication system 100 according to the invention. In a similar manner, a single compresso...

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Abstract

Disclosed is a dual cavity air lubrication system including an air flow splitter with an air inlet pipe branching into a first branch pipe and a second branch pipe, wherein a first passive valve is arranged in the first branch pipe and a second passive valve is arranged in the second branch pipe, wherein the branch pipes are in fluid communication with each other upstream from their respective valves, and wherein the valves are adapted for regulating the flow of air to respective air cavities to compensate for difference in air pressure in the cavities caused by a relative change in level of the cavities due to roll or heel of the vessel.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a dual cavity air lubrication system comprising a first and a second air cavity which are arranged for providing air to an air lubricating layer between a substantially flat bottom of a vessel and the water flowing under the bottom as the vessel is moving through the water. The invention also relates to a vessel, in particular a displacement vessel, provided with a number of such air lubrication systems.BACKGROUND ART[0002]An air lubrication system is known from JP 2011-011699A, which describes a microscopic bubble generator which discharges bubbles to a submerged surface of a vessel's hull from a number of discharge ports arranged at different height levels in the submerged surface to reduce the friction resistance of the hull. The bubble generator comprises an air blower in which a pair of three-lobe displacement rotors arranged in a blower casing are rotatable by a drive motor; an outlet pipe connected on the side of a ...

Claims

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Application Information

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IPC IPC(8): B63B1/38
CPCB63B1/38B63B2001/387Y02T70/10
Inventor SILBERSCHMIDT, NOAHJOHANNESSON, JOHANNESPAPPAS, PANAYIOTISTASKER, DOMINIC
Owner SILVERSTREAM TECH