Elastic support for inner pipe of vacuum double-wall pipe

Abstract

The utility model discloses an elastic support for an inner pipe of a vacuum double-wall pipe, the elastic support comprises a Teflon piece, a spring fixing piece and a spring, the spring fixing piece is of a hollow structure, one end of the spring fixing piece is fixedly connected with the outer side wall of the inner pipe of the vacuum double-wall pipe, and the opposite end of the spring fixing piece is fixedly connected with the Teflon piece. The spring is vertically arranged in an inner cavity of the spring fixing piece in the radial direction of the vacuum double-wall pipe, and the end face of the end, away from the spring fixing piece, of the Teflon piece abuts against the inner side wall of the vacuum double-wall pipe. According to the elastic support for the inner pipe of the vacuum double-wall pipe, low-temperature conduction in the inner pipe is completely isolated under the condition that low-temperature stress between the inner pipe and the outer pipe and fluid impact stress in the pipeline are met.

Description

Technical Field

[0001] The utility model relates to the technical field of shipbuilding, in particular to an elastic bracket for an inner tube of a vacuum double-wall tube. Background Art

[0002] LNG, liquid nitrogen, liquid hydrogen and other media are all ultra-low temperature liquids. If leaked, they will cause low temperature corrosion to personnel or nearby structures. Therefore, using vacuum double-walled pipes as transmission pipelines is the most common way. The inner tube of the vacuum double-walled pipe transmits the low temperature medium, and the vacuum area between the inner and outer tubes isolates the low temperature conduction, thereby ensuring that the surface temperature of the outer tube of the vacuum double-walled pipe is at room temperature.

[0003] But whether it is LNG, liquid nitrogen or liquid hydrogen, the temperature in the liquid state is extremely low. How to effectively prevent the low temperature in the inner tube from being transmitted to the outer tube of the vacuum double-walled tube is the purpose of current research. Generally speaking, the inner and outer tubes of the double-walled tube will be evacuated to a vacuum state of about 0.5Pa in the annular area between the inner and outer tubes of the double-walled tube. This vacuum state basically isolates the radiation and conduction of temperature, but the brackets between the inner and outer tubes of the vacuum double-walled tube must also adopt a special design type to isolate the low temperature conduction. At the same time, due to the large temperature difference between the inner and outer tubes, the inner and outer tubes will also be subject to great stress. How to effectively eliminate the conduction of the low temperature in the inner tube and withstand the huge stress between the inner and outer tubes is the core design point of our technology. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an elastic bracket for the inner tube of a vacuum double-wall tube, which can completely isolate the low-temperature conduction in the inner tube while satisfying the low-temperature stress between the inner and outer tubes and the impact stress of the fluid in the pipeline.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An elastic bracket for an inner tube of a vacuum double-walled tube, the elastic bracket comprising a Teflon component, a spring fixing component and a spring, the spring fixing component being a hollow structure, one end of the spring fixing component being fixedly connected to the outer side wall of the inner tube of the vacuum double-walled tube, and the opposite end being fixedly connected to the Teflon component, the spring being vertically arranged in the inner cavity of the spring fixing component along the radial direction of the vacuum double-walled tube, and the end face of one end of the Teflon component away from the spring fixing component abutting against the inner side wall of the vacuum double-walled tube.

[0007] Furthermore, the Teflon part is a Teflon cap, and the spring fixing part includes a clamping ring and a spring base. The cross-sections of the clamping ring and the spring base are both right-angled U-shaped, the width of the spring base is the same as the width of the U-shaped cavity of the clamping ring, the clamping ring is embedded in the Teflon cap, and the opening faces the outside of the Teflon cap, the spring base is clamped in the clamping ring, and the opening faces the inside of the clamping ring, and is telescopically connected to the clamping ring, one end of the spring is fixedly connected to the inner bottom wall of the spring base, and the other end is fixedly connected to the inner bottom wall of the clamping ring, and the outer side of the bottom wall of the spring base is fixedly connected to the outer side wall of the inner tube of the vacuum double-wall tube.

[0008] Furthermore, a plurality of the elastic supports are arranged in a mirror-symmetrical manner between the inner tube of the vacuum double-walled tube and the outer tube of the vacuum double-walled tube.

[0009] Furthermore, the outer side wall of the Teflon cap abutting against the outer tube of the vacuum double-wall tube is an arc-shaped side wall, and the diameter of the arc-shaped side wall is smaller than the inner diameter of the outer tube of the vacuum double-wall tube.

[0010] Furthermore, the materials of the clamping ring, the spring base and the spring are all low-temperature resistant materials, and the material of the Teflon cap of the elastic bracket is a material that isolates low-temperature conduction.

[0011] The utility model of the elastic bracket for the inner tube of the vacuum double-walled pipe, on the one hand, plays a supporting role between the inner and outer tube brackets; on the other hand, it plays a role in isolating the low-temperature conduction of the cryogenic liquid in the inner tube; thirdly, it plays a role in stress impact in all directions of the inner and outer tubes. The utility model of the elastic bracket for the inner tube of the vacuum double-walled pipe has been applied to vacuum double-walled pipes in multiple projects, and the stress calculation and actual ship verification fully meet the requirements of the specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the elastic support for the inner tube of the vacuum double-wall tube described in the utility model;

[0013] Figure 2 It is a structural schematic diagram of the elastic bracket for the inner tube of a vacuum double-wall tube according to the utility model in use.

[0014] Among them, 1-vacuum double-wall tube outer tube, 2-vacuum double-wall tube inner tube, 3-elastic bracket, 31-Teflon cap, 32-spring, 33-clamp ring, 34-spring base. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1-2As shown, an elastic bracket for an inner tube of a vacuum double-walled tube, a plurality of the elastic brackets 3 are mirror-symmetrically arranged between the inner tube 2 of the vacuum double-walled tube and the outer tube 1 of the vacuum double-walled tube, the elastic bracket 3 comprises a Teflon cap 31, a spring fixing member and a spring 32, the spring 32 fixing member is a hollow structure, comprising a clamping ring 33 and a spring base 34, the cross-sections of the clamping ring 33 and the spring base 34 are both right-angled U-shaped, the width of the spring base 34 is the same as the width of the U-shaped cavity of the clamping ring 33, and the clamping ring 33 is embedded in the inner tube 2 and the outer tube 1. It is arranged in the Teflon cap 31, with the opening facing the outside of the Teflon cap 31, the spring base 34 is clamped in the clamping ring 33, with the opening facing the inside of the clamping ring 33, and is telescopically connected to the clamping ring 33, one end of the spring 32 is fixedly connected to the inner bottom wall of the spring base 34, and the other end is fixedly connected to the inner bottom wall of the clamping ring 33, the outer side of the bottom wall of the spring base 34 is fixedly connected to the outer side wall of the inner tube 2 of the vacuum double-wall tube, and the end face of the Teflon cap 31 away from the spring fixing part abuts against the inner side wall of the vacuum double-wall tube.

[0017] The outer side wall of the Teflon cap 31 that abuts against the outer tube 1 of the vacuum double-wall tube is an arc-shaped side wall, and the diameter of the arc-shaped side wall is smaller than the inner diameter of the outer tube 1 of the vacuum double-wall tube; the materials of the retaining ring 33, the spring base 34 and the spring 32 are all low-temperature resistant materials, and the material of the Teflon cap 31 of the elastic bracket 3 is a material that isolates low-temperature conduction.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elastic support for an inner tube of a vacuum double-wall tube, characterized in that: The elastic bracket includes a Teflon component, a spring fixing component and a spring. The spring fixing component is a hollow structure. One end of the spring fixing component is fixedly connected to the outer wall of the inner tube of the vacuum double-wall tube, and the opposite end is fixedly connected to the Teflon component. The spring is vertically arranged in the inner cavity of the spring fixing component along the radial direction of the vacuum double-wall tube, and the end face of one end of the Teflon component away from the spring fixing component abuts against the inner wall of the vacuum double-wall tube.

2. The elastic support for the inner tube of a vacuum double-walled tube according to claim 1, characterized in that: The Teflon part is a Teflon cap, and the spring fixing part includes a clamping ring and a spring base. The cross-sections of the clamping ring and the spring base are both right-angle U-shaped. The width of the spring base is the same as the width of the U-shaped cavity of the clamping ring. The clamping ring is embedded in the Teflon cap with the opening facing the outside of the Teflon cap. The spring base is clamped in the clamping ring with the opening facing the inside of the clamping ring and is telescopically connected to the clamping ring. One end of the spring is fixedly connected to the inner bottom wall of the spring base, and the other end is fixedly connected to the inner bottom wall of the clamping ring. The outer side of the bottom wall of the spring base is fixedly connected to the outer side wall of the inner tube of the vacuum double-wall tube.

3. The elastic support for the inner tube of a vacuum double-walled tube according to claim 2, characterized in that: The plurality of elastic supports are arranged in a mirror-symmetrical manner between the inner tube of the vacuum double-walled tube and the outer tube of the vacuum double-walled tube.

4. The elastic support for the inner tube of a vacuum double-wall tube according to claim 2, characterized in that: The outer side wall of the Teflon cap abutting against the outer tube of the vacuum double-wall tube is an arc-shaped side wall, and the diameter of the arc-shaped side wall is smaller than the inner diameter of the outer tube of the vacuum double-wall tube.

5. The elastic support for the inner tube of a vacuum double-wall tube according to claim 2, characterized in that: The materials of the clamping ring, the spring base and the spring are all low-temperature resistant materials, and the material of the Teflon cap of the elastic bracket is a material that isolates low-temperature conduction.

Images