Liquefied natural gas (LNG) vacuum double-wall pipe shape-maintaining supporting tool

Abstract

The utility model discloses an LNG (liquefied natural gas) vacuum double-wall pipe shape-preserving supporting tool which comprises a shape-preserving supporting body, the shape-preserving supporting body is arranged between an inner pipe and an outer pipe of a vacuum double-wall pipe, and the shape-preserving supporting body comprises a first hollow cylindrical part and a second hollow cylindrical part which are integrally formed. The outer diameter of the first hollow cylinder part is smaller than that of the second hollow cylinder part, the outer diameter of the second hollow cylinder part is equal to the inner diameter of the vacuum double-wall pipe, and an inner pipe of the vacuum double-wall pipe penetrates through the first hollow cylinder part and the second hollow cylinder part. The shape-preserving supporting tool for the LNG vacuum double-wall pipe not only can preserve the shape, but also can be used as a blanking cap, and can also be used as an argon filling protection tool.

Description

Technical Field

[0001] The utility model relates to the technical field of shipbuilding, in particular to a shape-preserving support tool for LNG vacuum double-wall pipes. Background Art

[0002] With the increasing high-end and environmental protection requirements of shipbuilding products, LNG fuel is now used in large ro-ro ships. Therefore, a large number of LNG vacuum double-wall pipes are installed on ships. Since it is the welding of inner and outer double-layer pipes, the problem of welding deformation is particularly prominent. Especially for multi-bent double-wall pipes, eccentricity and non-coaxiality phenomena have occurred. Our standard is that the coaxial error is between ±1 mm. Due to the gravity effect on the spring support during on-site installation, the error will be between 0 - 2 mm. During the transportation process, the pipe orifice will be deformed due to impact, etc. Some inevitable factors exist, which has long been a difficult point for the industry to improve production efficiency. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a shape-preserving support tool for LNG vacuum double-wall pipes, which can not only preserve the shape, but also serve as a plug and an argon-filling protection tool.

[0004] To achieve the above purposes, the utility model adopts the following technical solutions:

[0005] A shape-preserving support tool for LNG vacuum double-wall pipes includes a shape-preserving support body. The shape-preserving support body is placed between the inner pipe and the outer pipe of the vacuum double-wall pipe. The shape-preserving support body includes an integrally formed first hollow cylindrical part and a second hollow cylindrical part. The outer diameter of the first hollow cylindrical part is smaller than that of the second hollow cylindrical part, and the outer diameter of the second hollow cylindrical part is the same as the inner diameter of the vacuum double-wall pipe. The inner pipe of the vacuum double-wall pipe passes through the first hollow cylindrical part and the second hollow cylindrical part.

[0006] Further, the inner diameter of the first hollow cylindrical part is the same as that of the second hollow cylindrical part.

[0007] Further, the free end face of the second hollow cylindrical part and the end face of the outer pipe of the vacuum double-wall pipe are located in the same vertical plane, and the end face of the inner pipe of the vacuum double-wall pipe is located outside the free end face of the second hollow cylindrical part.

[0008] Further, a through hole communicating between the outer pipe and the inner pipe of the vacuum double-wall pipe is provided on the shape-preserving support body.

[0009] Further, the through hole penetrates through the free end faces of the first hollow cylindrical part and the second hollow cylindrical part.

[0010] Further, the aperture of the through hole is 10 mm.

[0011] The LNG vacuum double-wall pipe shape-preserving support tooling of the present utility model has good shape-preserving function, plugging function, enabling the annular vacuum cavity to be free from external contamination, argon filling function, protecting the welds from oxidation, with a cost far lower than that of stainless steel, eliminating the need to purchase special plugs separately, saving the purchase cost, being convenient, lightweight and easy to recycle without mechanical cooperation; it can control the welding deformation, transportation deformation and deformation under gravity of the LNG vacuum double-wall pipe, prevent contamination and can be used for argon filling protection tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a perspective view of the LNG vacuum double-wall pipe shape-preserving support tooling of the present utility model;

[0013] Figure 2 is a schematic diagram of the usage state of the LNG vacuum double-wall pipe shape-preserving support tooling of the present utility model.

[0014] Wherein, 1 - the first hollow cylindrical part, 2 - the second hollow cylindrical part, 3 - the inner pipe, 4 - the outer pipe, 5 - the through hole, 6 - argon gas. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0016] As Figure 1 - Figure 2 shown, a kind of LNG vacuum double-wall pipe shape-preserving support tooling includes a shape-preserving support body. The shape-preserving support body includes an integrally formed first hollow cylindrical part 1 and a second hollow cylindrical part 2. The outer diameter of the first hollow cylindrical part 1 is smaller than the outer diameter of the second hollow cylindrical part 2, and the outer diameter of the second hollow cylindrical part 2 is the same as the inner diameter of the vacuum double-wall pipe. The inner diameter of the first hollow cylindrical part 1 is the same as the inner diameter of the second hollow cylindrical part 2. A through hole 5 communicating between the outer pipe 4 and the inner pipe 3 of the vacuum double-wall pipe is provided on the shape-preserving support body. The through hole 5 penetrates the free end faces of the first hollow cylindrical part 1 and the second hollow cylindrical part 2, and the aperture of the through hole 5 is 10 mm. The shape-preserving support body is placed between the inner pipe 3 and the outer pipe 4 of the vacuum double-wall pipe. The inner pipe 3 of the vacuum double-wall pipe passes through the first hollow cylindrical part 1 and the second hollow cylindrical part 2. The free end face of the second hollow cylindrical part 2 and the end face of the outer pipe 4 of the vacuum double-wall pipe are located in the same vertical plane, and the end face of the inner pipe 3 of the vacuum double-wall pipe is located outside the free end face of the second hollow cylindrical part 2.

[0017] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A LNG vacuum double-wall pipe shape-preserving support tooling, characterized in that: It includes a shape-keeping support body, which is placed between the inner tube and the outer tube of the vacuum double-walled tube. The shape-keeping support body includes a first hollow cylindrical portion and a second hollow cylindrical portion that are integrally formed. The outer diameter of the first hollow cylindrical portion is smaller than the outer diameter of the second hollow cylindrical portion, and the outer diameter of the second hollow cylindrical portion is the same as the inner diameter of the vacuum double-walled tube. The inner tube of the vacuum double-walled tube is penetrated by the first hollow cylindrical portion and the second hollow cylindrical portion.

2. The LNG vacuum double-wall pipe shape-preserving support tooling according to claim 1 is characterized in that: The inner diameter of the first hollow cylindrical portion is the same as the inner diameter of the second hollow cylindrical portion.

3. The LNG vacuum double-wall pipe shape-preserving support tooling according to claim 1 is characterized in that: The free end surface of the second hollow cylindrical portion and the outer tube end surface of the vacuum double-walled tube are located in the same vertical plane, and the inner tube end surface of the vacuum double-walled tube is located outside the free end surface of the second hollow cylindrical portion.

4. The LNG vacuum double-wall pipe shape-preserving support tooling according to claim 1 is characterized in that: The shape-maintaining support body is provided with a through hole communicating with the outer tube and the inner tube of the vacuum double-wall tube.

5. The LNG vacuum double-wall pipe shape-preserving support tooling according to claim 4 is characterized in that: The through hole passes through the free end surfaces of the first hollow cylindrical portion and the second hollow cylindrical portion.

6. The LNG vacuum double-wall pipe shape-preserving support tooling according to claim 5 is characterized in that: The through hole has a diameter of 10 mm.

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