Pressure stabilization chamber structure applied to gas layer drag reduction ship

Abstract

A pressure stabilization chamber structure applied to a gas layer drag reduction ship, the pressure stabilization chamber comprising a polyethylene PE pipe (1) and a backing plate (2), the polyethylene PE pipes (1) are plural in number and extend along the width direction of the hull, the plural polyethylene PE pipes (1) are parallel and distributed at intervals along the length direction of the hull, and all of them are drilled into the longitudinal frame (100) of the ship, the polyethylene PE pipes (1) are provided with a first opening extending along the width direction of the hull, and both sides in the width direction of the first opening of the polyethylene PE pipes (1) are Both of them are connected to the bottom plate (200) to form a pressure stabilization chamber (11), the backing plate (2) extends along the width direction of the hull and is made of a corrosion-resistant material, and is located between the polyethylene PE pipe (1) and the bottom plate (200), the backing plate (2) is hermetically connected to the PE pipe and to the bottom plate (200), a first through hole is provided in the backing plate (2), and a second through hole is provided in the bottom plate (200) that communicates with the first through hole, and the pressure stabilization chamber (11) communicates with the outside of the hull via the first through hole and the second through hole. This structure can solve the corrosion prevention problem.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application bearing application number 202110204228.2, filed with the China Patent Office on February 23, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to a technical field of energy-saving resistance reduction for ships, and relates to a pressure stabilization chamber structure applied to, for example, a gas layer resistance reduction ship. [Background technology]

[0003] Gas layer drag reduction technology is a new energy-saving technology that uses a gas layer drag reduction device to inject an appropriate amount of gas into the bottom of the ship, form and maintain a thin gas layer at the bottom of the ship, effectively isolate the bottom of the ship from the water, and reduce the wetted surface area of ​​the bottom of the ship, thereby reducing the frictional resistance of the ship and reducing fuel consumption and CO2 emissions. When applied to an actual ship, gas layer drag reduction technology involves key technologies such as 1) uniformity of the gas nozzle jet and 2) formation and maintenance of stability of a gas layer at the bottom of the ship. The pressure stabilization chamber is a key component in the gas layer drag reduction system, and embodies gas rectification and pressure stabilization technology, which sufficiently reduces the speed, rectifies, and stabilizes the pressure of the gas in the pressure stabilization chamber to ensure that the speed and pressure of the gas ejected from multiple blowholes remain consistent, so that the gas can be ejected evenly into the water, making it easy to form and maintain a uniform and stable gas layer at the bottom of the ship.

[0004] In the related art, there are two types of pressure stabilization chamber installation on actual ships: backing plate-less type and backing plate-overlap type. Different installation methods can be selected according to factors such as the navigation area and ship characteristics. The space of the pressure stabilization chamber is small, and a water stop device cannot be arranged in this narrow space, so only the check valve and remote control valve arranged in the gas transport pipeline can prevent fresh water and seawater from entering the pressure stabilization chamber. In the above two installation methods, the blow-off head, the chamber body of the pressure stabilization chamber, the backing plate of the pressure stabilization chamber, and the gas transport pipeline located at the front end of the one-way cut-off valve all adopt seawater corrosion-resistant stainless steel or corrosion-resistant steel to form a local corrosion-resistant space and reduce the corrosion problem caused by the ingress of seawater. However, the service life of a ship is several decades, and the material industry has not been able to make a clear conclusion as to whether the effective corrosion-resistant life of seawater-resistant stainless steel or corrosion-resistant steel can be equivalent to or exceed the service life of the ship, so the corrosion prevention problem of the pressure stabilization chamber cannot be thoroughly solved. Summary of the Invention

[0005] The present application provides a pressure stabilization chamber structure applicable to a gas layer drag reduction vessel that can solve the corrosion prevention problem of the pressure stabilization chamber and eliminate the corrosion risk caused by seawater entering the pressure stabilization chamber.

[0006] A pressure stabilization chamber structure applied to a gas layer drag reduction vessel, the pressure stabilization chamber structure being provided at the bottom of the vessel, a polyethylene (PE) pipe that is plural in number and extends along the width direction of the hull, is parallel to and spaced apart from the longitudinal direction of the hull, is drilled into the longitudinal bone of the ship, and is provided with a first opening extending along the width direction of the hull, and both sides of the first opening in the width direction are connected to the bottom plate to form a pressure stabilization chamber; A backing plate extending along the width direction of the hull, made of a corrosion-resistant material, located between the PE pipe and the bottom plate, and hermetically connected to the PE pipe and the bottom plate; A pressure stabilization chamber structure is provided, in which a first through hole is provided in the backing plate, a second through hole communicating with the first through hole is provided in the bottom plate, and the pressure stabilization chamber communicates with the outside of the ship via the first through hole and the second through hole. [Brief description of the drawings]

[0007] [Figure 1] 1 is a structural schematic diagram of a pressure stabilization chamber structure (without an outer casing and a backing plate made of PE material) applied to one gas layer drag reduction ship according to an embodiment of the present application. FIG. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] FIG. 11 is a structural schematic diagram of a pressure stabilization chamber structure (having an outer casing and a backing plate made of PE material) applied to another gas layer drag reduction ship according to an embodiment of the present application. [Figure 4] FIG. 11 is a structural schematic diagram of a pressure stabilization chamber structure (without an outer casing and a steel backing plate) applied to another gas layer drag reduction ship according to an embodiment of the present application. [Explanation of symbols]

[0008] 100···Vertical frame, 200···Bottom plate, 300···Auxiliary plate, 1 PE pipe, 11 pressure stabilization chamber, 2. Backing plate, 3... injection head, 31... nozzle, 4...first sealant, 5...outer casing, 6...fastening material, 7...second sealant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the technical solutions of the embodiments of the present application will be described with reference to the drawings.

[0010] In the description of this application, unless otherwise specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, may be a fixed connection, a removable connection, or may be integral, may be a mechanical connection, may be an electrical connection, may be a direct connection, may be an indirect connection via an intermediate medium, may be an internal communication between two elements, or may be an interaction relationship between two elements. The specific meaning of the above terms in this application can be understood depending on the context.

[0011] In this application, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include contact between the first feature and the second feature through another feature between them without direct contact. Furthermore, a first feature being "above," "upper," and "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or may simply indicate that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or may simply indicate that the horizontal height of the first feature is smaller than that of the second feature.

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical solution of the present application will be described through specific embodiments with reference to the drawings.

[0013] As shown in Figures 1 to 4, the pressure stabilization chamber structure applied to the gas layer resistance reduction ship is provided at the bottom of the ship and includes a PE pipe 1 and a backing plate 2, among which, the number of PE pipes 1 is multiple, and the multiple PE pipes 1 all extend along the width direction of the ship, the multiple PE pipes 1 are parallel to each other and distributed at intervals along the length direction of the ship, the PE pipes 1 are drilled into the longitudinal bone 100 of the ship, the PE pipes 1 are provided with first openings, and the first openings extend along the width direction of the ship, and the width direction of the first openings of the PE pipes 1 is Both sides are connected to the bottom plate 200 to form a pressure stabilization chamber 11, the backing plate 2 extends along the width direction of the hull, the backing plate 2 is made of a corrosion-resistant material and is located between the PE pipe 1 and the bottom plate 200, the backing plate 2 is hermetically connected to the PE pipe 1 and the bottom plate 200, a first through hole is provided in the backing plate 2, and a second through hole is provided in the bottom plate 200 communicating with the first through hole, and the pressure stabilization chamber 11 communicates with the outside of the ship via the first through hole and the second through hole. A pressure stabilization chamber 11 is formed by connecting the PE pipe 1 and the bottom plate 200. The material of the chamber wall is PE material, which has better corrosion resistance than the steel material in the related art. At the same time, a backing plate 2 is provided between the bottom plate 200 and the PE pipe 1 to form an independent space completely isolated from the bottom plate 200, which prevents the PE pipe 1 from coming into direct contact with the bottom plate 200 and prevents corrosion of the bottom plate 200. At the same time, the backing plate 2 is made of a corrosion-resistant material, which has better corrosion resistance and backing. Sealed connections are used between the backing plate 2 and the bottom plate 200 and between the backing plate 2 and the bottom plate 200 and the PE pipe 1, ensuring the sealability of the connections between the backing plate 2 and the bottom plate 200 and preventing seawater from entering and coming into contact with the bottom plate 200. In addition, a first through hole is provided in the backing plate 2 and a second through hole is provided in the bottom plate 200, so that gas in the pressure stabilization chamber 11 can be ejected from the first through hole and the second through hole, thereby avoiding the need for an ejection head 3 and simplifying the pressure stabilization chamber structure.

[0014] The ship bottom plate 200 is a steel plate, and by providing a backing plate 2 between the PE pipe 1 and the ship bottom plate 200, corrosion caused by seawater entering the ship bottom plate 200 can be prevented. The material of the chamber wall is a PE material, which can generally withstand a pressure of 1 MPa. Depending on the type of PE material selected and used, different levels of pressure can be withstood, and the type of PE material can be selected according to different ship types.

[0015] In this embodiment, a standard PE pipe 1 or a PE pipe 1 having a customized shape can be selected and used. The chamber body of the pressure stabilization chamber 11 is a narrow and elongated gas passage arranged along the width direction of the ship, and may adopt a segment connection method, and between two adjacent PE pipes 1, thermal fusion welding or electric fusion welding may be adopted, or a method in which both are combined may also be adopted. The cross section of the PE pipe 1 is semicircular. In other embodiments, the cross section of the PE pipe 1 may be other shapes such as rectangular.

[0016] In this embodiment, in order to ensure the structural stability of the vertical frame 100, a support plate 300 is provided at each end of the vertical frame 100 in the extension direction, and the PE pipe 1 is drilled into the support plate 300 and the outer wall is fixed to the support plate 300. The support plate 300 can increase the structural strength of the vertical frame 100, and the stability of the vertical frame 100 is improved.

[0017] The pressure stabilization chamber structure applied to the gas layer resistance reduction ship may further include an injection head 3, the injection head 3 is drilled into the first through hole and the second through hole and is sealedly connected to the inner wall of the first through hole and the inner wall of the second through hole, a nozzle hole 31 is provided inside the injection head 3, the pressure stabilization chamber 11 is connected to the outside of the ship through the nozzle hole 31, and the injection head 3 is made of PE material or steel material. The injection head 3 may be provided at the positions of the first through hole and the second through hole, and the gas may be injected through the injection hole 31 in the injection head 3. That is, in this embodiment, the injection hole 31 may be a through hole directly drilled in the backing plate 2 and the bottom plate 200, or the injection head 3 may be provided and connected to both the inner walls of the first through hole and the second through hole with a seal, so that when the injection head 3 is not injecting gas, seawater may enter between the injection head 3 and the hole walls of the first through hole and the second through hole, and contact the bottom plate 200, thereby preventing corrosion of the bottom plate 200. The shape and size of the injection head 3 may be customized according to actual needs, and are not limited here. In other embodiments, the material of the injection head 3 may be selected and used from other materials.

[0018] The backing plate 2 may be made of PE material or steel material. When the tonnage of the ship is less than 100,000 tons, the backing plate 2 is made of PE material. In this embodiment, when the deformation of the bottom plate 200 of the area covered by the pressure stabilization chamber 11 along the ship length direction during the ship sailing is smaller than the preset value, the backing plate 2 is also selected and used with PE material, and the judgment of the preset value needs to be according to the corresponding ship parameters, and the thickness of the bottom plate 200 and the sailing speed of the ship are the ship parameters that are the key to the judgment of the preset value, and the preset value may be, for example, 10mm to 20mm.

[0019] In this embodiment, when the backing plate 2 is made of PE material, the backing plate 2 and the bottom plate 200 are hermetically bonded with an epoxy adhesive, and both end faces of the backing plate 2 along the longitudinal direction of the hull are hermetically connected to the bottom plate 200 with a first sealant 4, which is an epoxy adhesive, an anode shield paint and a sealant. By using the backing plate 2 made of PE material and hermetically bonding the opposing faces of the backing plate 2 and the bottom plate 200 with an epoxy adhesive, the pressure stabilization chamber structure can be prevented from being corroded, and the use of the epoxy adhesive can ensure that the connection between the backing plate 2 and the bottom plate 200 is reliable and at the same time ensures sealing, and prevents seawater from entering between the backing plate 2 and the bottom plate 200 and contacting the bottom plate 200, thereby preventing the bottom plate 200 from being corroded by seawater. Both end surfaces of the backing plate 2 are hermetically connected to the bottom plate 200 by the first sealant 4, which can ensure a better sealing effect between the backing plate 2 and the bottom plate 200 and prevent seawater from entering and contacting the bottom plate 200. For example, by applying one layer each of the epoxy type adhesive, the anode shield paint, and the sealant at the connection points between both end surfaces of the backing plate 2 and the bottom plate 200, a triple seal can be realized and the sealing effect can be guaranteed. In other embodiments, the type and number of the first sealant 4 can be adaptively adjusted according to the actual usage situation, and other types of adhesives can be used instead of the epoxy type adhesive.

[0020] If the tonnage of the ship is greater than 100,000 tons, the backing plate 2 is made of steel. In this embodiment, if the deformation of the bottom plate 200 in the area covered by the pressure stabilization chamber 11 along the length of the ship is greater than a preset value when the ship is sailing, the backing plate 2 is selected to use steel. For ultra-large ships, the scale of the ship is too large, and the length of the ship can reach 200m or more, so that the bottom plate 200 of this type of ship will deform in the length of the ship during sailing, and the deformation scale will gradually increase as the tonnage of the ship increases. The size of the pressure stabilization chamber 11 in the longitudinal direction of the ship is at the level of several hundred millimeters, and deformation of the bottom plate 200 has almost no effect on it. However, there is still a risk of localized tearing in the connection between the backing plate 2 made of PE material and the bottom plate 200, which will have a certain impact on the function of the pressure stabilization chamber 11 and the safety of the ship. By using a backing plate 2 made of steel, it is possible to prevent deformation of the bottom of the ship from affecting the seal between the pressure stabilization chamber 11 and the bottom plate 200, and the backing plate 2 made of steel is equivalent to a bottom plate 200 that has been thickened, which is advantageous for corrosion prevention of the pressure stabilization chamber 11.

[0021] In other embodiments, the backing plate 2 may adaptively select other industrially mature corrosion-resistant materials according to different sizes, types and operating environments of ships.

[0022] In this embodiment, when the backing plate 2 is made of steel, both end faces of the backing plate 2 along the length of the hull are hermetically welded to the bottom plate 200, the PE pipe 1 and the backing plate 2 are hermetically connected by an epoxy adhesive, both end faces of the PE pipe 1 in the width direction of the first opening are hermetically connected to the backing plate 2 by a second sealant 7, and the second sealant 7 is an epoxy adhesive, an anode shield paint, and a sealant. Both end faces of the backing plate 2 along the length of the hull are hermetically welded to the bottom plate 200, the sealing effect between the backing plate 2 and the bottom plate 200 is guaranteed, the opposing surfaces between the PE pipe 1 and the backing plate 2 are hermetically connected by an epoxy adhesive, the sealing effect between the PE pipe 1 and the backing plate 2 can be guaranteed, and the second sealant 7 can realize a triple seal between both end faces of the PE pipe 1 in the width direction of the first opening and the backing plate 2, and the sealing effect is guaranteed. In other embodiments, the number of layers and the type of material of the second sealant 7 can be adaptively adjusted according to actual conditions, and if another corrosion-resistant material is selected and used for the backing plate 2, the type and installation positions of the first sealant 4 and the second sealant 7 can be adaptively adjusted according to differences in the material of the backing plate 2.

[0023] As shown in Fig. 3, the pressure stabilization chamber structure applied to the gas layer resistance reducing ship further includes an outer casing 5, which extends along the width direction of the ship and has a second opening, which extends along the width direction of the ship, both sides of the second opening of the outer casing 5 in the width direction are connected to the bottom plate 200, the PE pipe 1 and the backing plate 2 are both drilled at intervals inside the outer casing 5, and the outer wall of the outer casing 5 is welded to the vertical frame 100. The PE pipe 1 in the above pressure stabilization chamber structure is directly exposed inside the ship's cabin, and although the pressure resistance of the PE material is very high, it is damaged by a sharp object, which destroys the sealing of the pressure stabilization chamber 11, causing gas to leak, impairing the function of the pressure stabilization chamber 11, and further allowing seawater in the pressure stabilization chamber 11 to enter the inside of the ship's hull through the damaged point, which may affect the safety of the ship. The outer casing 5 prevents the pressure stabilization chamber 11 from being directly exposed to the outside, and in the event of a water leak from the pressure stabilization chamber 11, seawater can be prevented from entering the outer casing 5 and leaking into the inside of the hull.

[0024] The outer casing 5 is a steel pipe. Both sides of the second opening of the steel pipe in the width direction are welded to the bottom plate 200. In this embodiment, the cross section of the outer casing 5 is also semicircular, and the distance between the outer casing 5 and the PE pipe 1 is greater than 10 cm, which can ensure the requirements of the sealing process and avoid the influence of the welding of the outer casing 5 on the PE pipe 1. In other embodiments, the cross section of the outer casing 5 may be other shapes such as rectangular, and other materials with good strength may be selected as the material.

[0025] In other embodiments, the outer casing 5 may not be provided. Whether to provide the outer casing 5 can be adaptively selected according to the difference in the installation position in the vessel of different hull type or pressure stabilization chamber structure, and at the same time, whether to provide the outer casing 5 is not affected by the material of the backing plate 2.

[0026] As shown in Fig. 4, the pressure stabilization chamber structure applied to the gas layer drag reduction vessel further includes a fastening member 6, and both ends of the first opening of the PE pipe 1 are connected to the backing plate 2 by the fastening member 6. A connection portion extends outward on both sides in the width direction of the first opening of the PE pipe 1, and the two connection portions are respectively connected to the backing plate 2 by two fastening members 6. In combination with the adhesion between the connection portions and the backing plate 2, the double connection method can more reliably guarantee the connection between the PE pipe 1 and the backing plate 2. In this embodiment, the fastening member 6 is a bolt, and in other embodiments, the fastening member 6 may be another structure, such as a pin.

[0027] In the pressure stabilization chamber structure applied to the gas layer resistance reducing ship shown in Figures 1 and 2, in order to ensure the reliability of the connection, a connection part may be added to the PE pipe 1, and the connection part and the backing plate 2 may be connected by fastening material 6 to form a double connection method. In this embodiment, whether to use the fastening material 6 can be adaptively selected according to the different requirements for stability of the pressure stabilization chamber structure due to different ship types and the different requirements for reliability of the pressure stabilization chamber structure at different positions on the ship, and at the same time, the installation of the fastening material 6 is not affected by the material of the backing plate 2 and whether the outer casing 5 is provided.

[0028] In this embodiment, the pressure stabilization chamber structures applied to the gas layer drag reduction ship further include a plurality of zinc blocks provided inside the pressure stabilization chamber 11, which is advantageous for corrosion prevention of the pressure stabilization chamber 11. In other embodiments, the zinc blocks may not be provided, or a corrosion resistance process may be performed based on the pressure stabilization chamber structure according to this embodiment to increase the corrosion resistance of the pressure stabilization chamber structure.

[0029] In this embodiment, an air inlet pipe is further connected to the PE pipe 1, and the air inlet pipe communicates with the pressure stabilization chamber 11. The air inlet pipe is further provided with a structure such as a valve group, and gas can be injected into the pressure stabilization chamber 11 through the air inlet pipe. The air inlet pipe and the structure such as the valve group are both already related art, and will not be described again here.

[0030] The pressure stabilization chamber structure applied to the gas layer resistance reduction vessel of this embodiment adopts a PE pipe 1 and adopts a corrosion-resistant material for the backing plate 2, and at the same time, the backing plate 2 is hermetically connected with the bottom plate 200 and the PE pipe 1, thereby solving the corrosion prevention problem of the pressure stabilization chamber 11 and eliminating the corrosion risk caused by seawater entering and contacting the bottom plate 200. At the same time, according to the different installation positions of the vessels with different vessel types and pressure stabilization chamber structures, the material of the backing plate 2 can be adaptively selected as PE material, steel material or other material, whether to provide an outer casing 5 and fastening material 6 can be adaptively selected, whether to adopt an injection head 3 and the material of the injection head 3 can be adaptively selected, so as to form various structural types of corrosion-resistant pressure stabilization chamber structures, which ensures that the pressure stabilization chamber structure can solve the corrosion prevention problem of the pressure stabilization chamber 11 while increasing flexibility and diversity.

Claims

1. A pressure stabilization chamber structure applied to a gas layer resistance reduction ship, A vessel bottom is provided with: a plurality of polyethylene PE pipes (1) extending along the width direction of the hull, parallel to each other and distributed at intervals along the length direction of the hull, drilled into the longitudinal frame (100) of the ship and provided with first openings extending along the width direction of the hull, both sides of the first openings in the width direction being connected to the bottom plate (200) to form a pressure stabilization chamber (11); A backing plate (2) extending along the width direction of the hull, made of a corrosion-resistant material, located between the PE pipe (1) and the ship bottom plate (200), and hermetically connected to the PE pipe (1) and to the ship bottom plate (200); an outer casing (5) extending along the width direction of the hull and having a second opening extending along the width direction of the hull, both sides of the second opening in the width direction being connected to the bottom plate (200); a first through hole is provided in the backing plate (2), a second through hole communicating with the first through hole is provided in the bottom plate (200), the pressure stabilization chamber (11) communicates with the outside of the ship via the first through hole and the second through hole, The PE pipe (1) and the backing plate (2) are both drilled inside the outer casing (5), the outer wall of the outer casing (5) is welded to the vertical frame (100), and the distance between the outer casing (5) and the PE pipe (1) is greater than 10 cm; Pressure stabilization chamber structure.

2. The vessel further includes an injection head (3) that is drilled into the first through hole and the second through hole and is sealedly connected to the inner walls of the first through hole and the second through hole, the injection head (3) has an injection hole (31) formed therein, the pressure stabilization chamber (11) communicates with the outside of the vessel through the injection hole (31), and the injection head (3) is made of a PE material or a steel material. The pressure stabilization chamber structure according to claim 1 .

3. The outer casing (5) is a steel pipe. The pressure stabilization chamber structure according to claim 1 .

4. The backing plate (2) is made of PE material or steel material; The pressure stabilization chamber structure according to any one of claims 1 to 2.

5. If the tonnage of the ship is less than 100,000 tons, the backing plate (2) is made of PE material; 5. The pressure stabilization chamber structure according to claim 4.

6. The backing plate (2) and the bottom plate (200) are sealed and bonded together with an epoxy adhesive. Both end faces of the backing plate (2) along the length direction of the hull are sealed and connected to the bottom plate (200) by a first sealant (4), and the first sealant (4) is an epoxy type adhesive, an anode shield paint, and a sealant.

6. The pressure stabilization chamber structure according to claim 5.

7. If the tonnage of the ship is greater than 100,000 tons, the backing plate (2) is made of steel.

5. The pressure stabilization chamber structure according to claim 4.

8. Both end faces of the backing plate (2) along the longitudinal direction of the hull are hermetically welded to the bottom plate (200); The PE pipe (1) and the backing plate (2) are hermetically connected with an epoxy adhesive, and both end faces in the width direction of the first opening of the PE pipe (1) are hermetically connected to the backing plate (2) with a second sealant (7), and the second sealant (7) is an epoxy adhesive, an anode shield paint, and a sealant. The pressure stabilization chamber structure according to claim 7.

9. The pipe further includes a fastening member (6), and both ends of the first opening of the PE pipe (1) in the width direction are connected to the backing plate (2) by the fastening member (6). The pressure stabilization chamber structure according to any one of claims 1 to 2.

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