Steel-aluminum tubular adapter

Abstract

The invention discloses a steel-aluminum tubular conversion joint which comprises a steel conversion pipe section and an aluminum conversion pipe section, one end of the steel conversion pipe section is integrally provided with a tenon structure made of a steel structure, one end of the aluminum conversion pipe section is integrally provided with a mortise structure made of aluminum alloy, and the mortise structure and the tenon structure are in sealed connection in a mortise and tenon matching mode. According to the steel-aluminum tubular conversion connector, the steel conversion pipe sections and the aluminum conversion pipe sections are mechanically pressed to form a tenon-and-mortise matched sealing connection mode, by means of the connection mode, the connector can bear large loads, when the connector bears tension, pressure and shear force, the connector is not prone to loosening and breaking, and the service life of the connector is prolonged. Therefore, the overall strength and stability of the structure are effectively enhanced. And meanwhile, compared with traditional friction welding and explosive welding methods, operation is simpler and more convenient, and complex equipment and tedious process preparation are not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fittings connection, and particularly to a steel-aluminum tubular adapter joint. Background Art

[0002] In the construction of low-temperature fields, the application of steel-aluminum tubular adapter joints on cryogenic separation liquefaction cold boxes is becoming increasingly common. This adapter joint can effectively connect steel pipes and aluminum pipes, giving play to the advantages of both and providing guarantee for the stable operation of low-temperature systems. However, due to the huge differences in physical properties between steel and aluminum, it is difficult to directly weld them to each other. In the prior art, explosive welding steel-aluminum adapter joints and friction welding steel-aluminum joints are often used to connect steel pipes and aluminum pipes, but both of these methods have obvious deficiencies.

[0003] Regarding explosive welding steel-aluminum adapter joints, first, the safety requirements are extremely high. Since it uses the impact force generated by explosive explosion to achieve welding, there are non-negligible safety risks during the operation process. Strict safety protection measures and professional operators must be equipped, which undoubtedly increases the complexity and cost of the operation; second, it is difficult to control the accuracy. It is difficult to accurately control the welding parameters and joint quality during the explosive welding process, and welding defects such as cracks and incomplete penetration are likely to occur, and strict process control and detection means are needed to ensure the welding quality; third, the surface quality is poor. The surface of the workpiece after explosive welding often leaves traces and is uneven, and subsequent processing such as grinding and polishing is required to meet the surface quality requirements.

[0004] Friction welding steel-aluminum joints also have problems. First, the one-time investment in equipment is large. The purchase cost of friction welding machines is high. For the welding of some large structures, it may be difficult to carry out due to financial constraints; second, limited by the power of the main shaft motor, the current friction welding machines can weld smaller cross-sections, and there are great difficulties in welding workpieces with thick and large cross-sections; finally, non-circular cross-section welding is limited. Disc-shaped workpieces and thin-walled pipe fittings are difficult to weld because they are not easy to clamp. For workpieces with complex shapes, special fixtures and process equipment may be required, which greatly increases the difficulty and cost of welding.

[0005] In summary, the existing steel-aluminum connection technologies have many defects in practical applications, and there is an urgent need for a new technical solution to solve these problems to meet the requirements of high quality, low cost, safety and reliability of steel-aluminum tubular adapter joints in low-temperature fields. Summary of the Invention

[0006] In view of this, the present invention provides a steel-aluminum tubular adapter joint to avoid the contact welding between steel equipment pipelines and aluminum alloy equipment pipelines, and meet the requirements of continuity, tightness and strength for the connection of equipment pipelines.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A steel-aluminum tubular adapter, comprising a steel conversion pipe section and an aluminum conversion pipe section. One end of the steel conversion pipe section is integrally provided with a tenon structure made of steel structure, and one end of the aluminum conversion pipe section is integrally provided with a mortise structure made of aluminum alloy. The mortise structure and the tenon structure are hermetically connected in a tenon-mortise fit manner.

[0009] To better implement the above technical solution, optionally, the end of the steel conversion pipe section with the tenon structure and the end of the aluminum conversion pipe section with the mortise structure are both enlarged-diameter and thickened structures.

[0010] Optionally, both the steel conversion pipe section and the aluminum conversion pipe section are straight tubular structures.

[0011] Optionally, the tenon structure includes a tenon body with a T-shaped axial cross-section. On the outer wall of the small-diameter section of the tenon body, two inverted trapezoidal protrusions extending along the circumferential direction of the tenon body are provided at intervals in the axial direction. A trapezoidal ring groove is formed between the two inverted trapezoidal protrusions. The inner wall of the mortise structure is provided with connection grooves corresponding to the inverted trapezoidal protrusions one by one.

[0012] Optionally, the cross-sections of both the inverted trapezoidal protrusion and the trapezoidal ring groove are isosceles trapezoids.

[0013] Optionally, the mortise structure and the tenon structure are connected by extrusion riveting under vacuum conditions.

[0014] Advantages of the present invention:

[0015] For the steel-aluminum tubular adapter of the present invention, the steel conversion pipe section and the aluminum conversion pipe section form a hermetically connected tenon-mortise fit through mechanical pressing. This connection method enables the adapter to withstand large loads. When subjected to tensile force, pressure, and shear force, the adapter is not prone to loosening and breaking, thereby effectively enhancing the overall strength and stability of the structure. At the same time, compared with traditional friction welding and explosion welding methods, the operation is more convenient, without the need for complex equipment and cumbersome process preparations.

[0016] For the steel-aluminum tubular adapter of the present invention, the mortise structure and the tenon structure are connected by extrusion riveting under vacuum conditions. The vacuum environment can effectively prevent the joint part from being oxidized during the processing process, greatly improving the reliability and durability of the joint. Moreover, when carrying out extrusion riveting operation under vacuum conditions, a large amount of welding materials and chemical agents are not required, which not only reduces environmental pollution but also reduces energy consumption. Description of the drawings

[0017] Figure 1 is a three-dimensional schematic diagram of a steel-aluminum tubular adapter according to an embodiment of the present invention;

[0018] Figure 2 is Figure 1Cross-sectional view;

[0019] Reference numerals:

[0020] Steel conversion pipe section 10, tenon structure 11, tenon body 111, trapezoidal convex part 112, aluminum conversion pipe section 20, mortise structure 21, connecting groove 211. Specific embodiments

[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The same components are denoted by the same reference numerals.

[0022] Please refer to Figure 1 and Figure 2 , an embodiment of the present invention discloses a steel-aluminum tubular adapter, including a steel conversion pipe section 10 and an aluminum conversion pipe section 20. One end of the steel conversion pipe section 10 is integrally provided with a tenon structure 11 made of steel structure, and one end of the aluminum conversion pipe section 20 is integrally provided with a mortise structure 21 made of aluminum alloy. The mortise structure 21 and the tenon structure 11 are hermetically connected in a tenon and mortise fit manner.

[0023] In the steel-aluminum tubular adapter of the embodiment of the present invention, the steel conversion pipe section 10 and the aluminum conversion pipe section 20 are hermetically connected in a tenon and mortise fit manner by mechanical pressing. This connection method enables the adapter to bear a large load, making the adapter not easy to loosen and break under stress, and can effectively improve the overall strength and stability of the structure. At the same time, compared with traditional welding methods, such as friction welding, explosion welding, etc., this process is relatively simple, does not require complex equipment and processes, can quickly complete the manufacture of the adapter, improves production efficiency, and reduces production costs.

[0024] In the embodiment of the present invention, the end of the steel conversion pipe section 10 provided with the tenon structure 11 and the end of the aluminum conversion pipe section 20 provided with the mortise structure 21 are both enlarged diameter and thickened structures. The thickened tenon structure 11 and mortise structure 21 can further improve the strength of the connection between the steel conversion pipe section 10 and the aluminum conversion pipe section 20, so that the steel-aluminum tubular adapter can still maintain good connection performance under frequent stress or long-term heavy load, reduce the frequency of maintenance and replacement, and reduce the use cost.

[0025] In the embodiment of the present invention, both the steel conversion pipe section 10 and the aluminum conversion pipe section 20 are straight tubular structures. In other alternative embodiments, the steel conversion pipe section 10 and the aluminum conversion pipe section 20 can also adopt plate-like structures, thereby expanding the application range of the adapter and improving the versatility and market adaptability of the product.

[0026] In an embodiment of the present invention, the tenon structure 11 includes a tenon body 111 with a T-shaped axial cross-section. On the outer wall of the small-diameter section of the tenon body 111, two trapezoidal protrusions 112 extending along the circumferential direction of the tenon body 111 are axially spaced. A trapezoidal annular groove is formed between the two trapezoidal protrusions 112. The inner wall of the mortise structure 21 is provided with connection grooves 211 corresponding to the trapezoidal protrusions 112 one by one. Specifically, the cross-sections of the trapezoidal protrusions 112 and the trapezoidal annular groove are both isosceles trapezoids, and the axial cross-section of the corresponding connection groove 211 is also an isosceles trapezoid. By using the cooperation mode of two connection grooves 211 and the trapezoidal protrusions 112, the cooperation between the tenon and the mortise is made closer, which can effectively prevent relative sliding or dislocation during the stress process, and further improve the connection strength and stability of the joint. At the same time, due to the reduced requirements for processing equipment, production enterprises can use relatively ordinary processing equipment for production, reducing equipment procurement and maintenance costs, and improving the flexibility and economy of production.

[0027] In an embodiment of the present invention, the mortise structure 21 and the tenon structure 11 are extrusion-riveted and connected under vacuum conditions. By using the extrusion-riveting technology of the tenon and mortise structure under vacuum conditions, the vacuum environment can effectively prevent the joint part from being oxidized during the processing, avoiding the influence on the connection quality due to the generation of the oxide film, thereby improving the reliability and durability of the joint. In addition, extrusion-riveting is carried out under vacuum conditions, without the use of a large amount of welding materials and chemical agents, reducing environmental pollution and also reducing energy consumption.

[0028] The above has introduced the technical solution of the present invention in detail in combination with specific embodiments. The described specific embodiments are used to help understand the idea of the present invention. The derivations and deformations made by those skilled in the art based on the specific embodiments of the present invention also fall within the protection scope of the present invention.

Claims

1. A steel-aluminum tubular conversion joint, comprising a steel conversion pipe section (10) and an aluminum conversion pipe section (20), characterized in that: One end of the steel conversion pipe section (10) is integrally provided with a tenon structure (11) made of a steel structure, and one end of the aluminum conversion pipe section (20) is integrally provided with a mortise structure (21) made of an aluminum alloy, and the mortise structure (21) is sealedly connected to the tenon structure (11) in a mortise and tenon matching manner.

2. The steel-aluminum tubular conversion joint according to claim 1, characterized in that: The end of the steel conversion pipe section (10) provided with the tenon structure (11) and the end of the aluminum conversion pipe section (20) provided with the mortise structure (21) are both of expanded diameter and thickened structures.

3. The steel-aluminum tubular conversion joint according to claim 2 is characterized in that: The steel conversion pipe section (10) and the aluminum conversion pipe section (20) are both straight pipe structures.

4. The steel-aluminum tubular conversion joint according to claim 3 is characterized in that: The tenon structure (11) comprises a tenon body (111) having a T-shaped axial cross section, the outer wall of the small diameter section of the tenon body (111) being provided with two inverted trapezoidal protrusions (112) extending in a circumferential direction around the tenon body (111) at intervals in the axial direction, a trapezoidal annular groove being formed between the two inverted trapezoidal protrusions (112), and the inner wall of the mortise structure (21) being provided with connecting grooves (211) corresponding one-to-one with the inverted trapezoidal protrusions (112).

5. The steel-aluminum tubular conversion joint according to claim 4, characterized in that: The cross sections of the inverted trapezoidal protrusion (112) and the trapezoidal annular groove are both isosceles trapezoidal.

6. The steel-aluminum tubular conversion joint according to claim 1, characterized in that: The mortise structure (21) and the tenon structure (11) are connected by extrusion riveting under vacuum conditions.

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