A method for installing pipelines in a ship's stern tube

Abstract

The present invention discloses a method for installing pipelines in a ship's stern tube. The ship's stern tube comprises a stern tube inner pipeline and two stern tube bushings. The stern tube inner pipeline is fixed in a groove of an outer circle of the stern tube bushing through openings and fixed threaded seats provided on a stern column steel casting and a front bearing seat steel casting, as well as a conversion joint connected with the threaded seats. The present invention improves the method for installing pipelines in a ship's stern tube, optimizes the fixing mode of lubricating oil and air pipelines in the ship's stern tube from a welding mode to a threaded connection mode, facilitates construction by on-site personnel, and does not need to remove welds, thereby reducing the work intensity and improving the work environment. The present invention adopts simple structural components such as a conversion joint, a hexagonal pointed stainless steel annular sealing gasket, and a threaded seat to connect the stern tube inner pipeline, which not only has a good sealing effect, is convenient for installation and disassembly, but also can better adapt to harsh operating environments such as certain temperature, pressure, and frequent load changes.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, in particular to a method for installing a pipeline in a ship stern tube. Background Art

[0002] In current ship construction, welding is usually used to connect the lubricating oil and air pipelines in the stern tube of the ship. Generally, the pipelines in the stern tube are directly welded and fixed on the stern tube casting. The welding workload of the lubricating oil, air pipelines and other pipelines in the stern tube is large, and the installation time is long, which will lead to an increase in the occupancy time of the dock, thereby affecting the extension of the ship construction cycle, and during maintenance, it is time-consuming and laborious to remove the above pipelines. In the prior art, Chinese invention patent 202110822549.9 discloses a method for manufacturing a stern tube and a stern tube manufactured thereby. Although the method avoids the shrinkage deformation of the stern tube caused by welding through the method of manufacturing the stern tube, the connection method of the pipeline is still welding, which cannot effectively solve the convenience of installation and disassembly of the pipeline. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for installing pipelines in a ship's stern tube. The present invention improves the installation of pipelines in a ship's stern tube, making it more convenient to install, disassemble and replace pipelines in a ship's stern tube during ship construction and ship sailing, thereby shortening the ship construction period and saving costs.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution provided by the present invention is as follows:

[0005] The present invention provides a method for installing a pipeline in a ship stern tube, wherein the stern tube is arranged in a stern column segment of the ship, the front end of the stern tube is connected to a stern column casting, and the rear end is connected to a front bearing seat casting. The stern tube is characterized in that the stern tube comprises a pipeline in the stern tube and two stern tube bushings sleeved on the front end and the rear end of the pipeline in the stern tube, and the front end and the rear end of the pipeline in the stern tube are provided with a sealing device. The method comprises the following steps:

[0006] S1. Openings are symmetrically arranged in the tail pillar steel casting and the front bearing seat steel casting. The openings are perpendicular to the tail pipe bushing and have a diameter of The end surface of the opening is faceted, with a depth of 0 to 2.5 mm;

[0007] S2. A threaded seat is provided at the opening of the tail column steel casting and the front bearing seat steel casting. A conversion joint is provided at one end of the threaded seat of the tail column steel casting and the front bearing seat steel casting. The threaded seat and the conversion joint are connected by the inner thread and the outer thread of the threaded seat. The other end of the conversion joint is connected to the pipeline in the tail pipe through a ferrule joint. A new type of hexagonal pointed stainless steel annular sealing gasket is provided between the threaded seat on the tail column steel casting and the front bearing seat steel casting and the conversion joint;

[0008] S3, the outer circle of the tail pipe bushing is provided with a groove, and the inner pipe of the tail pipe is pressed into the outer circle groove of the tail pipe bushing from the openings in the tail column steel casting and the front bearing seat steel casting through the connection of the conversion joint, the hexagonal pointed stainless steel annular sealing gasket and the threaded seat. A through hole is provided in the middle of the threaded seat, and the lubricating oil, air, etc. in the inner pipe of the tail pipe smoothly and without leakage enter the sealing device at the head and tail ends of the inner pipe of the tail pipe;

[0009] S4. After installing the inner pipeline of the tail pipe, an airtightness test is performed. After the airtightness test is completed, nitrogen can be used to blow away the residual moisture and impurities inside the tail pipe and check the function of the temperature sensor. At this time, the inner pipeline of the tail pipe is fixed in the groove of the outer circle of the tail pipe bushing by the pipe clamp arranged in the middle of the inner pipeline of the tail pipe. The inner pipeline of the tail pipe is installed. Subsequently, the inside of the tail pipe will be cleaned and lubricated, and the shaft system will be installed;

[0010] S5. When it is necessary to dismantle or replace the new inner pipeline of the tail pipe, first loosen the ferrule joint between the conversion joint and the inner pipeline of the tail pipe, inspect or replace the new inner pipeline of the tail pipe, and install the new inner pipeline of the tail pipe to the original position. At this time, unless the threaded seat is damaged, it is generally not necessary to remove the threaded seat at the opening;

[0011] S6. In step S5, if the conversion joint is found to be damaged, the conversion joint is removed through the threaded connection between the conversion joint and the threaded seat, and a new conversion joint is installed to the original position through the threaded connection;

[0012] S7. In step S5 or step S6, for replacing a new inner pipeline of the tail pipe or a new conversion joint, it is necessary to perform an airtight test at a certain pressure again according to the requirements of step S4. After the airtight test, nitrogen can be used to blow away the residual moisture and impurities inside the tail pipe and check the function of the temperature sensor. After the test is successful, the inner pipeline of the tail pipe is connected to the threaded seat conversion joint and the new hexagonal pointed stainless steel annular sealing gasket, and fixed in the groove of the outer circle of the tail pipe bushing by a pipe clamp, and the disassembly or replacement of the new inner pipeline of the tail pipe is completed.

[0013] According to a more preferred technical solution, the outer diameter of the tail pipe bushing is interference fit with the tail pillar steel casting and the front bearing seat steel casting respectively.

[0014] According to a more preferred technical solution, the opening diameters of the tail column steel casting and the front bearing seat steel casting are smaller than the outer diameters of the corresponding threaded seats.

[0015] In a more preferred technical solution, the width of the outer circular groove of the tail pipe bushing is greater than the outer diameter of the inner pipeline of the tail pipe.

[0016] According to a more preferred technical solution, the pipeline inside the tail pipe includes a lubricating oil pipe, a sensor protection pipe, an air pipe and a cable pipe.

[0017] A more preferred technical solution is that the lubricating oil pipe, sensor protection pipe and air pipe are of stainless steel pipe.

[0018] A more preferred technical solution is to clean and remove burrs before the pipeline in the tail pipe to prevent impurities from affecting the sealing devices at the head and tail ends and the subsequent shaft system installation.

[0019] A more preferred technical solution is that the hexagonal pointed stainless steel annular sealing gasket has a hexagonal cross-section, a pointed top, and is made of stainless steel.

[0020] Based on the above technical solution, a method for installing pipelines in a ship stern tube of the present invention has been applied in practice in ship construction and has achieved the following technical effects:

[0021] (1) The present invention provides a method for installing pipelines in a ship's stern tube. By improving the method for installing pipelines in a ship's stern tube, the fixing method of the lubricating oil and air pipelines in the ship's stern tube is optimized from a welding method to a threaded connection method, which is convenient for construction by on-site personnel and no longer requires welding work to remove welds, thereby reducing the work intensity and improving the working environment.

[0022] (2) The present invention provides a method for installing pipelines in a ship's stern tube. The method connects the pipelines in the stern tube by using a suitable conversion joint, a hexagonal pointed stainless steel annular sealing gasket, a threaded seat and other relatively few components. The component structure is simple, the sealing effect is good, and it is easy to install and disassemble. It can better adapt to harsh operating environments such as certain temperature, pressure, frequent load changes, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1The invention discloses an overall structural diagram of a method for installing pipelines in a ship stern tube.

[0025] Figure 2 To invent a method for installing a pipeline in a ship stern tube Figure 1 Schematic diagram of part A.

[0026] Figure 3 To invent a method for installing a pipeline in a ship stern tube Figure 1 Schematic diagram of part B

[0027] Figure 4 Inventing a hexagonal pointed stainless steel annular sealing gasket for installing a pipeline in a ship stern tube

[0028] Figure 5 A cross-sectional view of a hexagonal pointed stainless steel annular sealing gasket for a method of installing a pipeline in a ship's stern tube

[0029] The numbers in the figure represent:

[0030] 1-pipeline inside the tail pipe, 2-tail pipe bushing, 3-tail column casting, 4-front bearing seat casting, 5-threaded seat, 6-conversion joint, 7-hexagonal pointed stainless steel annular sealing gasket, 8-pipe clamp DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The specific implementation of the present invention is further described in detail below in conjunction with the drawings and examples.

[0033] The present invention discloses a method for installing pipelines in a ship's stern tube, which is applied to a ship type that adopts a direct propulsion mode of a main engine. The stern tube of the ship type includes a keyless propeller, a propeller shaft and two intermediate shafts, two front and rear stern tube bushings and sealing devices, and lubricating oil, air pipelines, etc. in the stern tube. The present invention relates to a method for installing pipelines in a stern tube of a ship. The method adopts a threaded connection method to fix pipelines such as lubricating oil and air, and adopts a new type of hexagonal pointed stainless steel annular sealing gasket 7, a threaded seat 6, and a conversion joint 5 to connect the pipeline 1 in the ship's stern tube, so that the pipeline 1 in the stern tube has a better sealing effect and can better adapt to certain harsh operating environments such as temperature, pressure, and frequent load changes. When the ship is built, it is convenient for on-site installation and disassembly, improves construction efficiency, saves construction time and cost, and can also facilitate the disassembly and replacement of the shipowner after the ship is delivered.

[0034] A method for installing pipelines in a ship stern tube, such as Figure 1 As shown, the tail pipe includes a tail pipe inner pipeline 1 and two tail pipe bushings 2, the two tail pipe bushings 2 are respectively sleeved on the head end and the tail end of the tail pipe inner pipeline 1, the head end of the tail pipe inner pipeline 1 is connected to the tail column casting 3, the tail end of the tail pipe inner pipeline 1 is connected to the front bearing seat casting 4, the outer circle of the tail pipe bushing 2 is provided with a groove, the head end and the tail end of the tail pipe inner pipeline 1 are provided with a sealing device, and the middle part of the tail pipe inner pipeline 1 is provided with an annular pipe clamp 8.

[0035] like Figure 2-3 As shown, openings are symmetrically provided in the tail pillar steel casting 3 and the front bearing seat steel casting 4, the openings are 90° to each other with the tail pipe bushing 2, threaded seats 5 are fixed at the openings of the tail pillar steel casting 3 and the front bearing seat steel casting 4, respectively, a conversion joint 6 is provided at one end of the threaded seat 5, the threaded seat 5 and the conversion joint 6 are fixedly connected by external threads matching internal threads, the other end of the conversion joint 6 is connected to the tail pipe internal pipeline 1 through a ferrule joint, and the tail pipe internal pipeline 1 is press-fitted into the groove of the outer circle of the tail pipe bushing 2 from the openings in the tail pillar steel casting 3 and the front bearing seat steel casting 4.

[0036] like Figure 4-5 As shown, a hexagonal pointed stainless steel annular sealing gasket 7 is arranged between the threaded seat 5 and the conversion joint 6. The cross-sectional shape of the hexagonal pointed stainless steel annular sealing gasket 7 is hexagonal, the top is a pointed top, and the material of the annular gasket is stainless steel, which can allow the lubricating oil and air in the pipeline inside the tail pipe to pass into the tail pipe sealing device without leakage.

[0037] A method for installing a pipeline in a ship stern tube comprises the following steps:

[0038] S1. Openings are symmetrically arranged in the tail pillar steel casting 3 and the front bearing seat steel casting 4. The openings are perpendicular to the tail pipe bushing 2 and have a diameter of To ensure the accuracy of the opening size and prevent the tail column casting 3 and the front bearing seat casting 4 from deformation, the end surface of the opening is flattened. The depth is 0-2.5 mm, the opening is concentric with the tail pillar steel casting 3 and the tail pipe bushing 2, and the outer diameters of the two tail pipe bushings 2 are respectively interference fit with the tail pillar steel casting 3 and the front bearing seat steel casting 4.

[0039] S2. A threaded seat 5 is provided at the openings on the tail column steel casting 3 and the front bearing seat steel casting 4. A conversion joint 6 is provided at one end of the threaded seat 5 of the tail column steel casting 3 and the front bearing seat steel casting 4. A new type of hexagonal pointed stainless steel annular sealing gasket 7 is provided between the threaded seat 5 of the tail column steel casting 3 and the front bearing seat steel casting 4 and the conversion joint 6. The threaded seat 5 and the conversion joint 6 are connected by a connection method in which the inner thread of the threaded seat 5 cooperates with the outer thread. The other end of the conversion joint 6 is connected to the inner pipeline 1 of the tail pipe by a ferrule joint. The inner pipeline 1 of the tail pipe is a lubricating oil, air pipeline, etc., usually The 316L stainless steel pipe has a length that meets the requirements of the drawings, and a certain length of processing allowance is left at both ends to meet the needs of later installation. The lubricating oil, air and other pipelines in the installed tail pipe need to be cleaned in the early stage to remove burrs to prevent impurities from remaining and affecting the tail pipe sealing device and the shaft system.

[0040] S3, the tail pipe inner pipe 1 is connected with the conversion joint 7, the annular sealing gasket 8 and the threaded seat 6, and is pressed into the groove of the outer circle of the tail pipe bushing 2 from the openings in the tail column steel casting 3 and the front bearing seat steel casting 4. The middle part of the tail pipe inner pipe 1 is fixed by the annular pipe clamp 8 through the fastening bolts. A through hole is provided in the middle of the threaded seat 5 so that the lubricating oil, air, etc. in the tail pipe inner pipe 1 can smoothly and leak-freely enter the sealing device at both ends of the tail pipe inner pipe 1. The other end of the threaded seat 5 is welded to the lubricating oil and air opening surface of the tail column steel casting 3 and the front bearing seat steel casting 4. superior.

[0041] S4. After installing the accessories of the pipeline 1 in the tail pipe, such as the lubricating oil pipe, air pipe, cable pipe and temperature sensor, an air tightness test (3.7 bar, 3.7 bar, 8.8 bar) is performed. After the air tightness test is completed, nitrogen can be used to blow away the residual moisture and impurities inside the tail pipe and check the function of the temperature sensor. After the inside of the tail pipe is cleaned, lubricating oil is applied, the propeller shaft is cleaned, the front sealing device is installed, and the propeller shaft is installed in the front and rear tail pipe bushings 2.

[0042] S5. If it is necessary to dismantle or replace the new inner pipeline of the tail pipe, first loosen the ferrule joint between the conversion joint and the inner pipeline of the tail pipe, inspect or replace the new inner pipeline of the tail pipe, and install the new inner pipeline of the tail pipe to the original position. At this time, unless the threaded seat is damaged, it is generally not necessary to remove the threaded seat at the opening;

[0043] S6. In step S5, if the conversion joint is found to be damaged, the conversion joint is removed through the threaded connection between the conversion joint and the threaded seat, and a new conversion joint is installed to the original position through the threaded connection;

[0044] S7. In step S5 or step S6, for replacing a new inner pipeline of the tail pipe or a new conversion joint, it is necessary to perform an airtight test at a certain pressure again according to the requirements of step S4. After the airtight test, nitrogen can be used to blow away the residual moisture and impurities inside the tail pipe and check the function of the temperature sensor. After the test is successful, the inner pipeline of the tail pipe is connected to the threaded seat conversion joint and the new hexagonal pointed stainless steel annular sealing gasket, and fixed in the groove of the outer circle of the tail pipe bushing by a pipe clamp, and the disassembly or replacement of the new inner pipeline of the tail pipe is completed.

[0045] The present invention discloses a method for installing pipelines in a ship's stern tube. By improving the method for installing pipelines in a ship's stern tube, the fixing mode of lubricating oil and air pipelines in the ship's stern tube is optimized from a welding mode to a threaded connection mode, which is convenient for construction by on-site personnel and no longer requires welding work for removing welds, thereby reducing the work intensity and improving the work environment. The method adopts suitable conversion joints, hexagonal pointed stainless steel annular sealing gaskets, threaded seats and other components with simple structures to connect the pipelines in the stern tube, which not only has a good sealing effect, but is also convenient for installation and disassembly, and can better adapt to harsh operating environments such as certain temperatures, pressures, and frequent load changes.

[0046] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A method for installing pipelines in a ship stern tube, wherein the stern tube is arranged in a stern column section of the ship, the front end of the stern tube is connected to a stern column casting (3), and the rear end is connected to a front bearing seat casting (4), characterized in that: The tail pipe comprises a tail pipe inner pipeline (1) and two tail pipe bushings (2) sleeved on the front end and the rear end of the tail pipe inner pipeline (1), and sealing devices are provided at the front end and the rear end of the tail pipe inner pipeline (1). The method comprises the following steps: S1, openings are symmetrically provided in the tail pillar steel casting (3) and the front bearing seat steel casting (4), the openings are perpendicular to the tail pipe bushing (2), the opening diameter is ø15 mm, the end faces of the openings are face-faced, and the depth is 0-2.5 mm; S2. A threaded seat (5) is provided at the opening of the tail column steel casting (3) and the front bearing seat steel casting (4); a conversion joint (6) is provided at one end of the threaded seat (5) of the tail column steel casting (3) and the front bearing seat steel casting (4); the threaded seat (5) and the conversion joint (6) are connected by the internal thread and external thread of the threaded seat (5); the other end of the conversion joint (6) is connected to the pipeline (1) in the tail pipe by a ferrule joint; a new type of hexagonal pointed stainless steel annular sealing gasket (7) is provided between the threaded seat (5) of the tail column steel casting (3) and the front bearing seat steel casting (4) and the conversion joint (6); S3, a groove is provided on the outer circumference of the tail pipe bushing (2), and the tail pipe inner pipe (1) is pressed into the groove on the outer circumference of the tail pipe bushing (2) from the openings in the tail column steel casting (3) and the front bearing seat steel casting (4) by connecting the conversion joint (6), the hexagonal pointed stainless steel annular sealing gasket (7) and the threaded seat (5), and a through hole is provided in the middle of the threaded seat (5), so that the lubricating oil, air, etc. in the tail pipe inner pipe (1) can smoothly and without leakage enter the sealing devices at the front and rear ends of the tail pipe inner pipe (1); S4. After the tail pipe inner pipe (1) is installed, an airtightness test is performed. After the airtightness test is completed, nitrogen is used to blow away the residual moisture and impurities inside the tail pipe and the function of the temperature sensor is checked. At this time, the tail pipe inner pipe (1) is fixed in the groove of the outer circle of the tail pipe bushing (2) by the pipe clamp (8) provided in the middle of the tail pipe inner pipe (1). The tail pipe inner pipe (1) is installed. Subsequently, the inside of the tail pipe will be cleaned and lubricated, and the shaft system will be installed. S5. When it is necessary to dismantle or replace the new inner pipe (1) of the tail pipe, first loosen the ferrule joint between the conversion joint (6) and the inner pipe (1) of the tail pipe, inspect or replace the new inner pipe (1) of the tail pipe, and install the new inner pipe (1) of the tail pipe to the original position. At this time, unless the threaded seat (5) is damaged, it is generally not necessary to remove the threaded seat (5) at the opening. S6. In step S5, if the conversion joint (6) is found to be damaged, the conversion joint (6) is removed by threading the conversion joint (6) and the threaded seat (5), and a new conversion joint (6) is installed to the original position by threading; S7. In step S5 or step S6, when replacing a new tail pipe inner pipe (1) or a new conversion joint (6), it is necessary to perform an airtight test at a certain pressure again according to the requirements of step S4. After the airtight test, nitrogen can be used to blow away the residual moisture and impurities inside the tail pipe and check the function of the temperature sensor. After the test is successful, the tail pipe inner pipe (1) is connected to the threaded seat (5), the conversion joint (6) and the new hexagonal pointed stainless steel annular sealing gasket, and fixed to the groove of the outer circle of the tail pipe bushing (2) by the pipe clamp (8), and the disassembly or replacement of the new tail pipe inner pipe (1) is completed.

2. A method for installing pipelines in a ship stern tube according to claim 1, characterized in that: The outer diameter of the tail pipe bushing (2) is interference-fitted with the tail column steel casting (3) and the front bearing seat steel casting (4) respectively.

3. A method for installing pipelines in a ship stern tube according to claim 1, characterized in that: The diameters of the openings on the tail column steel casting (3) and the front bearing seat steel casting (4) are smaller than the outer diameter of the corresponding threaded seat (5).

4. A method for installing pipelines in a ship stern tube according to claim 1, characterized in that: The width of the outer circular groove of the tail pipe bushing (2) is greater than the outer diameter of the inner pipe (1) of the tail pipe.

5. The method for installing pipelines in a ship stern tube according to claim 1, characterized in that: The pipelines (1) in the tail pipe include a lubricating oil pipe, a sensor protection pipe, an air pipe, a cable pipe and the like.

6. A method for installing pipelines in a ship stern tube according to claim 5, characterized in that: The lubricating oil pipe, sensor protection pipe, air pipe, cable pipe and other pipelines are ø15×1.5mm316L stainless steel pipes.

7. A method for installing pipelines in a ship stern tube according to claim 1, characterized in that: Before installing the inner pipe (1) of the tail pipe, it is necessary to clean and remove burrs to prevent impurities from affecting the sealing devices and shaft system at the front and rear ends.

8. A method for installing pipelines in a ship stern tube according to claim 1, characterized in that: The hexagonal pointed stainless steel annular sealing gasket (7) has a hexagonal cross-section, a pointed top, and is made of stainless steel.

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