Large-diameter stainless steel pipe material port adjustable connection method

Abstract

The application discloses a kind of adjustable connection methods suitable for large-diameter pipe port, and the large-diameter pipe port is pressed and connected using annular occlusion cavity.The connection method can process the connection outer pipe fitting with metal ring in advance in the factory to facilitate on-site use, ensure safety and environmental protection, avoid excessive deformation of the connection outer pipe to ensure the connection strength of the connection outer pipe, ensure the replaceability of the connection inner pipe, and flexibly adjust the pipe diameter of the connection inner pipe according to the wall thickness of the large-diameter pipe to ensure that the occlusion annular space gap formed by the inner and outer pipes matches the wall thickness of the large-diameter pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe processing, and specifically to an adjustable connection method for the port of a large-diameter stainless steel pipe. Background Technology

[0002] In recent years, with the strengthening of national safety and environmental protection regulations, on-site welding has been increasingly restricted. Because welding poses a fire hazard and generates large amounts of waste gas and slag, causing serious environmental pollution, prohibiting on-site welding has become a common management measure.

[0003] Furthermore, the reduction and expansion of large-diameter stainless steel pipes (over 300mm) requires immense force to overcome the material's strength and induce plastic deformation. Typically, this work necessitates the use of specialized large-scale equipment, which is rarely available at pipeline installation sites. Even if on-site installation is possible, the costs are prohibitively high. Therefore, in traditional pipeline engineering, on-site installation of large-diameter stainless steel pipes is both time-consuming and costly, and is prone to safety, environmental, and quality issues.

[0004] For example, when connecting large-diameter stainless steel pipes with a diameter of 300mm or more using the method of the early patent application CN112628488B - a method for tensile reinforcement connection of metal pipe fittings, as mentioned above, when the outer metal connecting pipe and the reinforcing inner pipe are locked at the step position to reduce the diameter, there will be construction difficulties in reducing the diameter on site (because the force required for reducing the diameter is too large due to the large pipe wall thickness, and the large difference between the outer and inner pipe diameters also results in a large reduction in diameter), and there is also the problem that the large reduction in diameter will cause excessive deformation of the outer pipe, thus affecting the strength of the pipe body. These limitations and constraints seriously affect the progress and efficiency of the project.

[0005] Therefore, a new pipeline connection method is needed that can achieve efficient, environmentally friendly, and high-quality pipeline treatment without being limited by on-site equipment, thereby improving the progress and efficiency of engineering projects. This patent is designed to address this need. Summary of the Invention

[0006] To address the above problems, the present invention aims to provide an adjustable connection method for the port of large-diameter stainless steel pipe.

[0007] To achieve this technical objective, the present invention provides an adjustable connection method for large-diameter pipe ports, which uses an annular interlocking cavity to press-fit the large-diameter pipe ports, comprising the following implementation steps: Step 1: Select a metal connecting outer pipe according to the outer diameter of the large-diameter pipe port. The inner diameter of the connecting outer pipe should match the outer diameter of the large-diameter pipe port. Step 2: Select a metal connecting inner tube according to the inner diameter of the large-diameter pipe port, and match the outer diameter of the connecting inner tube with the inner diameter of the large-diameter pipe port; and enlarge one end of the connecting inner tube so that the enlarged outer diameter of the end matches the inner diameter of the connecting outer tube. Step 3: Manufacture a metal ring, the wall thickness of which is less than or equal to the difference between the inner diameter of the connecting outer tube and the outer diameter of the connecting inner tube; Step 4: Insert the metal ring into the inner wall of the connecting outer tube and weld the metal ring to the inner wall of the connecting outer tube for fixation. Then insert the connecting inner tube into the inner wall of the connecting outer tube, passing through the metal ring until the expanded diameter end of the connecting inner tube stops at the metal ring, forming a mating end component with an annular interlocking cavity. Step 5: The other end of the connecting outer tube relative to the annular interlocking cavity is welded to other connecting structural components to form a connector for on-site construction. Step 6: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe to achieve the connection.

[0008] Preferably, the other connecting component in step five is another mating end component, and the connecting outer tubes of the two mating end components are welded to form a continuous connector.

[0009] Preferably, the other connecting components in step five are any one of elbows, tees, or crosses.

[0010] Preferably, in step four, the length of the expanded end of the inner connecting tube is less than the distance between the port of the outer connecting tube and the welding metal ring. After the expanded end of the inner connecting tube stops at the metal ring, the outer connecting tube is then pressed and reduced in diameter at the opening end corresponding to the inner connecting tube, so that the expanded end of the inner connecting tube is limited to the position between the metal ring and the reduced diameter position of the outer connecting tube.

[0011] Preferably, in step four, the length of the expanded end of the inner connecting tube is less than the distance between the port of the outer connecting tube and the welding metal ring. After the expanded end of the inner connecting tube stops at the metal ring, the open end of the inner connecting tube is welded to the inner wall of the outer connecting tube, so that the inner connecting tube is fixed inside the outer connecting tube.

[0012] This application also provides an adjustable connection method for large-diameter pipe ports, which uses an annular interlocking cavity to press-fit the large-diameter pipe ports, including the following implementation steps: Step 1: Select two metal connecting outer pipes based on the outer diameter of the large-diameter pipe port. The inner diameter of these connecting outer pipes should match the outer diameter of the large-diameter pipe port. Step 2: Select a section of metal connecting inner tube according to the inner diameter of the large-diameter pipe port, and match the outer diameter of the connecting inner tube with the inner diameter of the large-diameter pipe port; then enlarge the middle section of the connecting inner tube so that the enlarged outer diameter of the middle section matches the inner diameter of the connecting outer tube. Step 3: Manufacture two metal rings, the wall thickness of which is less than or equal to the difference between the inner diameter of the connecting outer tube and the outer diameter of the connecting inner tube. Step 4: Insert the two metal rings into the two connecting outer tubes respectively and weld the metal rings to the inner wall of their respective connecting outer tubes for fixation. Then, insert the two connecting outer tubes into the connecting inner tubes from both ends until the top of the metal rings stops at the expanded diameter end of the connecting inner tubes, forming two symmetrical mating ports with annular interlocking cavities with the two ends of the connecting inner tubes respectively; at the same time, weld the adjacent ports of the two connecting outer tubes together. Step 5: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe to achieve the connection.

[0013] The beneficial effects of this invention are: 1. This method allows for the pre-processing of connecting outer pipe fittings with metal rings in the factory, facilitating on-site construction and ensuring safety and environmental protection; 2. It can avoid excessive deformation of the connecting outer pipe, ensuring the connection strength of the connecting outer pipe; 3. It ensures the replaceability of the connecting inner pipe, allowing for flexible adjustment of the pipe diameter according to the wall thickness of the large-diameter pipe, ensuring that the interlocking annular space gap formed by the inner and outer pipes matches the wall thickness of the large-diameter pipe. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure connecting the outer tube and the metal ring in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the connecting outer tube and the metal ring in Embodiment 1 of the present invention; Figure 4 This is an exploded view of Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the structure connecting the outer tube and the metal ring in Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the structure connecting the outer tube and the metal ring in Embodiment 2 of the present invention; Figure 8 This is an exploded view of Embodiment 2 of the present invention.

[0015] In the diagram: 1. Connecting outer pipe; 2. Large-diameter pipe; 3. Connecting inner pipe; 4. Metal ring. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; these embodiments are only some embodiments of the present invention; other embodiments obtained based on this application without inventive effort are all within the scope of protection of the present invention.

[0017] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," etc., are all based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of clearly describing this embodiment. They do not indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application. At the same time, the terms "first" and "second" in the embodiments are only used for descriptive purposes and do not represent an indication or implication of relative importance.

[0018] like Figure 1-4 As shown, the first specific embodiment of the present invention is an adjustable connection method for the port of large-diameter pipes.

[0019] The large-diameter pipes involved in this invention are mainly used for transporting liquids. Typically, their pipe diameter (i.e., the outer diameter of the pipe) is selected according to national standards during design, but the pipe wall thickness is selected based on the actual pressure requirements of the liquid transport (mainly water) and the actual usage environment. For example, ordinary rainwater and sewage drainage pipes generally use thin-walled drainage pipes, while high-pressure water supply pipes use thick-walled pipes. Due to the different pipe wall thicknesses, different cavities need to be constructed when using a crimping connection method. Therefore, this invention uses an annular crimping cavity to press-fit the two ends of the large-diameter pipe. The design of the connector needs to consider factors such as the pipe's diameter, length, and thickness to ensure appropriate strength and rigidity. Since welding is generally not allowed on-site, the connection method of this invention is suitable for pre-fabricated connections in the factory that are easy to install on-site. Based on this, to match large-diameter pipes of different thicknesses, it is necessary to select connecting inner pipes of different outer diameters to match the connecting outer pipes to achieve an adjustable connection. The method of this invention includes the following implementation steps: Step 1: Select a metal connecting outer pipe 1 according to the outer diameter of the large-diameter pipe 2 port. The inner diameter of the connecting outer pipe 1 matches the outer diameter of the large-diameter pipe 2 port. Step 2: Select a metal connecting inner tube 3 according to the inner diameter of the port of the large-diameter pipe 2. The outer diameter of the connecting inner tube 3 matches the inner diameter of the port of the large-diameter pipe 2. Expand one end of the connecting inner tube 3 so that the expanded outer diameter of the end matches the inner diameter of the connecting outer tube 1. Step 3: Manufacture a metal ring 4. The wall thickness of the metal ring 4 is less than or equal to the difference between the inner diameter of the connecting outer tube 1 and the outer diameter of the connecting inner tube 3, so that the metal ring 4 can be fitted between the connecting outer tube 1 and the connecting inner tube 3, ensuring that the connector has good sealing performance.

[0020] Step 4: Insert the metal ring 4 into the interior of the connecting outer tube 1 and weld the metal ring 4 to the inner wall of the connecting outer tube 1 for fixation. Then insert the connecting inner tube 3 into the interior of the connecting outer tube 1, passing through the metal ring 4 until the expanded diameter end of the connecting inner tube 3 stops at the metal ring 4, forming a mating end component with an annular interlocking cavity. If the inner and outer connecting tubes are directly welded together, the resulting connecting ring cavity is fixed and cannot be changed. It can only accommodate pipes of one thickness, lacking flexibility. If mass production is carried out for storage, it will become unusable and scrapped if the pipe wall thickness is adjusted. This application, however, fixes the connection by welding a metal ring to the inner wall of the outer connecting tube, and then inserting the inner connecting tube to form a mating end component with an annular interlocking cavity. This facilitates operation by pre-preparing various specifications of inner connecting tubes. During connection, a matching inner connecting tube is selected based on the pipe wall thickness, forming an annular cavity of different sizes, achieving adjustable connection and reducing costs and storage space.

[0021] Specifically, if the length of the expanded end of the inner pipe 3 is less than the distance between the port of the outer pipe 1 and the welded metal ring 4, it can be locked in two ways: The first method is to press the expanded end of the inner pipe 3 against the metal ring 4, then compress the opening end of the outer pipe 1 corresponding to the inner pipe 3 to reduce its diameter, so that the expanded end of the inner pipe 3 is confined between the metal ring 4 and the reduced diameter position of the outer pipe 1. During compression, a clamping or ring-pressing tool can be used to lock the position of the outer pipe 1 corresponding to the inner pipe 3, and the pressure should be tightened according to the specified pressure. The appropriate pressure for different pipe diameters is common knowledge in the field. This connection method is easy to install, convenient for on-site use, and highly adaptable, suitable for pipes of various sizes and shapes, and used to connect different types of pipe materials. The second method is to press the expanded end of the inner pipe 3 against the metal ring 4, then weld the opening end of the inner pipe 3 to the inner wall of the outer pipe 1, thus fixing the inner pipe 3 inside the outer pipe 1. The welding method used to connect the inner tube 3 and the outer tube 1 results in a tighter connection, higher connection strength, and greater resistance to high temperatures and leakage, as well as stronger stability.

[0022] Step 5: The other end of the connecting outer tube 1 relative to the annular interlocking cavity is welded to other connecting structural components to form a connector for on-site construction. Among them, the other connecting components are another mating end components. The connecting outer pipe 1 of the two mating end components is welded to form a straight connector for connecting with a straight pipe. The other connecting components can also be any of the elbows, tees, or crosses for connecting with pipes in different directions.

[0023] Step 6: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe 2 end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe 1 to achieve the connection.

[0024] like Figure 5-8 As shown in the figure, a specific embodiment of this application provides a two-port adjustable connection method suitable for large-diameter pipes.

[0025] The method of using an annular interlocking cavity to press-fit the two ends of a large-diameter pipe includes the following steps: Step 1: Select two metal connecting outer pipes 1 according to the outer diameter of the large-diameter pipe 2 port. The inner diameter of the connecting outer pipe 1 matches the outer diameter of the large-diameter pipe 2 port. Step 2: Select a section of metal connecting inner tube 3 according to the inner diameter of the port of the large-diameter pipe 2. The outer diameter of the connecting inner tube 3 matches the inner diameter of the port of the large-diameter pipe 2. Expand the middle part of the connecting inner tube 3 so that the expanded outer diameter of the middle part matches the inner diameter of the connecting outer tube 1. This ensures the replaceability of the inner tube 3 and allows the diameter of the inner tube 3 to be adjusted on-site according to the wall thickness of the large-diameter pipe 2 to ensure that the interlocking annular space gap formed by the inner and outer tubes 1 matches the wall thickness of the large-diameter pipe 2. Step 3: Manufacture two metal rings 4, the wall thickness of which is less than or equal to the difference between the inner diameter of the connecting outer tube 1 and the outer diameter of the connecting inner tube 3. Step 4: Insert the two metal rings 4 into the two connecting outer tubes 1 respectively and weld the metal rings 4 to the inner wall of their respective connecting outer tubes 1 for fixation. Then, insert the two connecting outer tubes 1 from both ends of the connecting inner tube 3 until the metal rings 4 stop at the expanded diameter end of the connecting inner tube 3, forming two symmetrical mating ports with annular interlocking cavities with both ends of the connecting inner tube 3. At the same time, weld the adjacent ports of the two connecting outer tubes together. Step 5: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe 2 end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe 1 to achieve connection.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for adjustable connection of large-diameter pipe ends, characterized in that, The method of using an annular interlocking cavity to press-fit the ends of large-diameter pipes includes the following steps: Step 1: Select a metal connecting outer pipe according to the outer diameter of the large-diameter pipe port. The inner diameter of the connecting outer pipe should match the outer diameter of the large-diameter pipe port. Step 2: Select a metal connecting inner tube according to the inner diameter of the large-diameter pipe port, and match the outer diameter of the connecting inner tube with the inner diameter of the large-diameter pipe port; and enlarge one end of the connecting inner tube so that the enlarged outer diameter of the end matches the inner diameter of the connecting outer tube. Step 3: Manufacture a metal ring, the wall thickness of which is less than or equal to the difference between the inner diameter of the connecting outer tube and the outer diameter of the connecting inner tube; Step 4: Insert the metal ring into the inner wall of the connecting outer tube and weld the metal ring to the inner wall of the connecting outer tube for fixation. Then insert the connecting inner tube into the inner wall of the connecting outer tube, passing through the metal ring until the expanded diameter end of the connecting inner tube stops at the metal ring, forming a mating end component with an annular interlocking cavity. Step 5: The other end of the connecting outer tube relative to the annular interlocking cavity is welded to other connecting structural components to form a connector for on-site construction. Step 6: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe to achieve the connection.

2. The adjustable connection method for large-diameter pipe ports according to claim 1, characterized in that: The other connecting component in step five is another mating end component, and the connecting outer tubes of the two mating end components are welded to form a continuous connector.

3. The adjustable connection method for large-diameter pipe ports according to claim 1, characterized in that, The other connecting components in step five are any one of elbows, tees, or crosses.

4. The adjustable connection method for large-diameter pipe ports according to any one of claims 1 to 3, characterized in that, In step four, the length of the expanded end of the inner connecting tube is less than the distance between the port of the outer connecting tube and the welding metal ring. After the expanded end of the inner connecting tube stops at the metal ring, the outer connecting tube is then pressed and reduced in diameter at the opening end corresponding to the inner connecting tube, so that the expanded end of the inner connecting tube is limited to the position between the metal ring and the reduced diameter position of the outer connecting tube.

5. The adjustable connection method for large-diameter pipe ports according to any one of claims 1 to 3, characterized in that, In step four, the length of the expanded end of the inner connecting tube is less than the distance between the port of the outer connecting tube and the welding metal ring. After the expanded end of the inner connecting tube stops at the metal ring, the open end of the inner connecting tube is welded to the inner wall of the outer connecting tube, so that the inner connecting tube is fixed inside the outer connecting tube.

6. A method for adjustable connection of large-diameter pipe ends, characterized in that... The method of using an annular interlocking cavity to press-fit the ends of large-diameter pipes includes the following steps: Step 1: Select two metal connecting outer pipes based on the outer diameter of the large-diameter pipe port. The inner diameter of these connecting outer pipes should match the outer diameter of the large-diameter pipe port. Step 2: Select a section of metal connecting inner tube according to the inner diameter of the large-diameter pipe port, and match the outer diameter of the connecting inner tube with the inner diameter of the large-diameter pipe port; then enlarge the middle section of the connecting inner tube so that the enlarged outer diameter of the middle section matches the inner diameter of the connecting outer tube. Step 3: Manufacture two metal rings, the wall thickness of which is less than or equal to the difference between the inner diameter of the connecting outer tube and the outer diameter of the connecting inner tube. Step 4: Insert the two metal rings into the two connecting outer tubes respectively and weld the metal rings to the inner wall of their respective connecting outer tubes for fixation. Then, insert the two connecting outer tubes into the connecting inner tubes from both ends until the top of the metal rings stops at the expanded diameter end of the connecting inner tubes, forming two symmetrical mating ports with annular interlocking cavities with the two ends of the connecting inner tubes respectively; at the same time, weld the adjacent ports of the two connecting outer tubes together. Step 5: At the construction site, inject adhesive into the annular interlocking cavity, then insert the large-diameter pipe end into the annular interlocking cavity, and then use a pipe pressing device to press the connecting outer pipe to achieve the connection.

Images