CN-121973905-A - Installation process of ship bottom air lubrication device

Abstract

The invention discloses an installation process of a ship bottom air lubrication device, which comprises horizontal prefabrication and welding flatness control of an air jet belt, a double-hole punching method of firstly punching a single hole and then secondarily positioning, independent welding and then integrally folding of a compound plate and a pressing plate, and height difference control and dye check detection of an outboard pipe. In the installation structure, the diversion trench and the backflow cavity formed by the gradual expansion trapezoidal pressing plate, the surface of the jet belt and the periphery of the ship bottom are surrounded, local low-pressure vortex can be generated when the bubble oscillator works, bubbles can be detained, thinned and continuously adsorbed, and the stability and the coverage uniformity of a bubble layer are improved. The invention not only greatly shortens the construction period in the dock, but also effectively enhances the drag reduction efficiency and energy efficiency performance of the ship through the structured air film generating unit.

Inventors

• XIA BIN
• WANG CHANGHONG

Assignees

• 中船澄西船舶修造有限公司

Dates

Publication Date

20260505

Application Date

20260226

Claims (10)

1. 1. The installation process of the ship bottom air lubrication device is characterized by comprising the following steps of: s01, prefabricating an air pipeline and an air jet belt, welding the air jet belt to be of a preset length, performing the welding process on a horizontal platform, and controlling the overall levelness of the air jet belt; s02, installing an air compressor to a preset cabin position of a ship body and positioning to complete corresponding circuit connection; S03, integrally assembling the welded jet belt to a ship bottom installation area and positioning, and correspondingly marking the opening positions of the outer side pipes on the jet belt and the ship body outer plates according to the positioning result and opening the openings; s04, assembling the outboard tube at the position of the opening, enabling the end surface of the outboard tube, the outer plate of the ship bottom and the surface of the jet belt to meet the requirement of a preset height difference, and welding; S05, arranging a compound plate and a pressing plate between the back surface of the air injection belt and the outer plate of the ship bottom, preliminarily fixing the compound plate and the pressing plate through spot welding, dismantling the air injection belt, respectively and independently welding the compound plate and the pressing plate, and finally welding the air injection belt and the outer plate of the ship bottom after the compound plate and the pressing plate are finished; S06, inserting an air inlet short pipe of the bubble oscillator into each air outlet hole of the air injection belt and fixing the air inlet short pipe through bolts; s07, connecting the air compressor to an air supply pipeline of the air injection belt.
2. 2. The installation process of the ship bottom air lubrication device according to claim 1, wherein in S01, the levelness of the whole air jet belt is measured and controlled by a level meter, and the plane height difference of the welded joints of adjacent air jet belts is controlled within a range of +/-0.5 mm.
3. 3. The process for installing an air lubrication device for a ship bottom according to claim 1 or 2, wherein in S01, a passivation paste is applied to the surface of the welded joint adjacent to the air jet belt.
4. 4. The process for installing the bottom air lubrication device according to claim 1, wherein in S03, when the air jet belt and the hull outer plate are perforated, a first outboard pipe installation hole is formed by scribing according to the positioning result, and after the first outboard pipe is assembled, the air jet belt is used for positioning again, and a second outboard pipe installation hole is formed based on the positioning.
5. 5. The process for installing the ship bottom air lubrication device according to claim 1, wherein in S04, the height difference between the end surface of the outer pipe and the outer plate of the ship bottom is controlled to be within 25mm, the height difference between the outer pipe and the surface of the air jet belt is controlled to be within 8mm, and after welding, the surface of the weld joint is not allowed to have cracks or is not fused by adopting dye check detection.
6. 6. The process for installing the ship bottom air lubrication device according to claim 1, wherein in S05, a composite plate arranged between the back surface of the air jet belt and the ship bottom outer plate is connected through full-length welding, and a pressing plate is connected through intermittent welding, and the composite plate and the pressing plate are welded to the air jet belt and the ship bottom outer plate respectively before final welding of the air jet belt.
7. 7. The process for installing an air lubrication device on a ship bottom according to claim 6, wherein in step S05, the composite plate is a strip structure continuously arranged along the length direction of the air jet belt, the pressing plates are block structures arranged at two sides of the composite plate at intervals, and the interval areas between adjacent block structures form diversion trenches, and the extending direction of the diversion trenches is consistent with the heading of the ship body.
8. 8. The process for installing an air lubrication device on a ship bottom according to claim 7, wherein the block-shaped structure is trapezoidal and has a gradually expanding structure along a heading direction, an air jet of the air jet belt is positioned in front of the block-shaped structure, an outlet of the air bubble oscillator points to the heading direction, and the air bubble oscillator is positioned in a ship body above the block-shaped structure.
9. 9. The process for installing an air lubrication device according to claim 1, wherein in S05, a sacrificial anode metal block is disposed in the air jet strip, and the sacrificial anode metal block is located in a fore-flow guiding front area of the air jet strip.
10. 10. The process for installing an air lubrication device at the bottom of a ship according to claim 7 or 8, wherein after the step S06 is completed, the bubble oscillator, the air outlet hole of the air injection belt and the diversion trench between the adjacent block structures are enclosed to form a backflow cavity, the initial bubble group ejected from the outlet of the bubble oscillator moves forward under the longitudinal guidance of the diversion trench, and part of bubbles enter the backflow cavity under the guidance of the diverging side surfaces and form local vortex therein.

Description

Installation process of ship bottom air lubrication device Technical Field The invention relates to the technical field of ship accessories, in particular to a mounting process of a ship bottom air lubrication device. Background The ship bottom air lubrication device is an energy-saving technology applied to the field of ships, and the basic principle is that an air injection belt is arranged at the ship bottom to release uniform and continuous bubble flow to the surface of a ship body to form a layer of air film coating, so that the friction resistance between the ship body and water is reduced, and the sailing energy consumption and pollutant emission are reduced. The system generally comprises components such as an air compressor, an air supply pipeline, an air injection belt, a bubble oscillator and the like, can effectively improve the energy efficiency index of the ship, accords with the increasingly strict carbon emission and energy efficiency rules of the International maritime organization, and is one of the important technical means for the green reformation of the active ship. However, the ship bottom air lubrication device still faces a plurality of technical difficulties in the actual installation process. The manufacturing and mounting precision requirements of the jet belt are high, and in particular, the tight fit of the jet belt in the curved surface area of the ship bottom needs to be ensured, the welding seam is smooth and corrosion-resistant, and the welding process and the assembly positioning are highly challenged. Secondly, the system relates to the integrated arrangement of a large number of pipelines, compressors and control units, and the factors such as ship structure, space limitation, safety, heat dissipation and the like are required to be comprehensively considered. In addition, the construction time in the dock is short, the cross operation is frequent, and higher requirements are provided for tooling design, process coordination and personnel allocation. How to efficiently and accurately complete the installation and debugging of the whole set of system while the influence on the normal operation of the ship is as small as possible has become a problem to be solved. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a mounting process of a ship bottom air lubrication device with shorter construction period and higher efficiency. In order to achieve the above purpose, the technical scheme provided by the invention is as follows. The installation process of the ship bottom air lubrication device comprises the following steps of: s01, prefabricating an air pipeline and an air jet belt, welding the air jet belt to be of a preset length, performing the welding process on a horizontal platform, and controlling the overall levelness of the air jet belt; s02, installing an air compressor to a preset cabin position of a ship body and positioning to complete corresponding circuit connection; S03, integrally assembling the welded jet belt to a ship bottom installation area and positioning, and correspondingly marking the opening positions of the outer side pipes on the jet belt and the ship body outer plates according to the positioning result and opening the openings; s04, assembling the outboard tube at the position of the opening, enabling the end surface of the outboard tube, the outer plate of the ship bottom and the surface of the jet belt to meet the requirement of a preset height difference, and welding; S05, arranging a compound plate and a pressing plate between the back surface of the air injection belt and the outer plate of the ship bottom, preliminarily fixing the compound plate and the pressing plate through spot welding, dismantling the air injection belt, respectively and independently welding the compound plate and the pressing plate, and finally welding the air injection belt and the outer plate of the ship bottom after the compound plate and the pressing plate are finished; S06, inserting an air inlet short pipe of the bubble oscillator into each air outlet hole of the air injection belt and fixing the air inlet short pipe through bolts; s07, connecting the air compressor to an air supply pipeline of the air injection belt. In the S01, the overall levelness of the air-jet belt is measured and controlled by a level gauge, and the plane height difference of the welded joints of adjacent air-jet belts is controlled within a range of +/-0.5 mm. In the preferred technical scheme, in S01, passivation paste is applied to the surface of the welding seam adjacent to the air-jet belt. As a preferable technical solution, in S03, when the air-jet belt and the hull plate are perforated, the first outboard pipe mounting hole is scribed and opened according to the positioning result, and after the first outboard pipe is assembled, the air-jet belt is used for positioning again, and then the second outboard pipe mounting hole is opened b