Complicated-shape double-layer pipe manufacturing method and sealing device

A technology of complex shapes and manufacturing methods, applied in the field of complex shape double-layer tube manufacturing methods and sealing devices, can solve the problems of inability to manufacture complex shapes, large volume of double-layer tubes, high manufacturing costs, etc., and achieve high engineering application value and preparation process Simple, long-lasting effect

Inactive Publication Date: 2014-04-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for manufacturing a double-layer tube with a complex shape and a sealing device to solve t

Method used

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  • Complicated-shape double-layer pipe manufacturing method and sealing device
  • Complicated-shape double-layer pipe manufacturing method and sealing device
  • Complicated-shape double-layer pipe manufacturing method and sealing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step is to select a carbon steel pipe blank with a pipe diameter of 40 mm and a length of 500 mm as the inner pipe 2, such as figure 2 As shown, weld both ends of the inner tube 2 to the sealing device 1, and use 8 M5 bolts to strengthen the combination of the inner tube 2 and the sealing device 1;

[0032] The second step is to put the sealing device 1 and the inner pipe 2 into another carbon steel billet outer pipe 3 with a pipe diameter of 50 mm and a length of 540 mm, such as image 3 As shown, the two ends of the outer tube 3 are welded to the sealing device 1, and then 16 M5 bolts are used to strengthen the combination of the outer tube 3 and the sealing device 1, as shown in Figure 6 shown;

[0033] The third step is to use a bending die on the press to bend and deform the fully assembled double-layer pipe until the shape of the outer pipe 3 becomes V-shaped, such as Figure 7 shown;

[0034] The fourth step is to use the hydraulic cylinder to simu...

Embodiment 2

[0039] The first step is to select a stainless steel tube blank with a diameter of 30 mm and a length of 600 mm as the inner tube 2, such as figure 2 As shown, after the surface of the inner tube 2 is cleaned, the two ends and the sealing device 1 are welded together by surfacing welding, and eight M5 bolts are used to strengthen the combination of the inner tube 2 and the sealing device 1;

[0040] The second step is to put the sealing device 1 and the inner tube 2 into another stainless steel tube blank outer tube 3 with a diameter of 40 mm and a length of 640 mm, such as image 3 As shown, the two ends of the outer tube 3 are welded to the sealing device 1, and then 16 M5 bolts are used to strengthen the combination of the outer tube 3 and the sealing device 1, as shown in Figure 6 shown;

[0041] The third step is to bend the fully assembled double-layer pipe on the push bending machine, control the bending speed to avoid pipe rupture, and change the shape of the outer ...

Embodiment 3

[0047] The first step is to use the 316 stainless steel tube blank with excellent corrosion resistance as the inner tube 2, with a diameter of 40 mm and a length of 700 mm, such as figure 2 As shown; first clean the surface of the inner tube, and then weld the two ends of the inner tube 2 to the sealing device, and use 8 M5 bolts to strengthen the combination of the inner tube 2 and the sealing device 1;

[0048] In the second step, the outer pipe 3 selects a low-cost carbon steel billet with a pipe diameter of 50 mm and a length of 740 mm. Put the sealing device 1 and the inner tube 2 into the outer tube 3, such as image 3 As shown, the two ends of the outer tube 3 are welded to the sealing device 1, and then 16 M5 bolts are used to strengthen the combination of the outer tube 3 and the sealing device 1, as shown in Figure 6 shown;

[0049] The third step is to use a three-roller roll bender to perform roll bending deformation on the fully assembled double-layer tube, an...

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Abstract

The invention discloses a complicated-shape double-layer pipe manufacturing method and belongs to the field of double-layer pipe manufacturing technologies. The manufacturing method comprises the following steps: coaxially putting pipe blanks with different diameters, welding and reinforcing the two ends of the pipe blanks and a sealing device, then performing bending deformation; secondly, injecting a high-pressure liquid into an inner pipe and a gap between the inner pipe and an outer pipe, simultaneously pressuring in the inner pipe and the gap between the inner pipe and the outer pipe, increasing the gap between the inner pipe and the outer pipe by controlling the liquid pressure difference between the two so that the inner pipe reaches a needed shape; at last, releasing the high-pressure liquid, performing vacuum-pumping on the gap between the inner pipe and the outer pipe, simultaneously sealing the inner pipe and outer pipe at the two ends of the double-layer pipe to obtain the double-layer pipe. According to the complicated-shape double-layer pipe manufacturing method, by performing vacuum-pumping heat insulation on the gap between the inner pipe and the outer pipe, the weight of a heat insulation pipe is obviously reduced, the manufacturing cost is reduced, and various complicated-shape double-layer pipe fittings can be produced to be suitable for the requirements of different industries. The invention also discloses a sealing device for manufacturing the complicated-shape double-layer pipe.

Description

technical field [0001] The invention relates to a manufacturing method and a sealing device of a complex-shaped double-layer tube, in particular to a manufacturing method and a sealing device of a complex-shaped double-layer tube with a vacuum structure, belonging to the technical field of double-layer tube manufacturing. Background technique [0002] At present, heat insulation pipes have great application value in aviation, aerospace, automobile, petrochemical and other fields. Existing heat insulation pipes are mainly divided into two types: (1). Heat pipe, this kind of heat insulation pipe has large radial size, high manufacturing cost, poor environmental protection performance and the outer layer of insulation material is easy to fall off; (2) Fill insulation material, inert gas or keep vacuum between the inner and outer tubes of the double-layer metal tube , and sealed at both ends to form a heat-insulating pipe, this method is currently mainly suitable for the manufac...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21D26/045
Inventor 陶杰郭训忠范敏郁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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