Support pipe clamp for axial limiting of low-temperature pipe

Abstract

The support pipe clamp comprises a bottom support and a longitudinal connecting pipe, the bottom support is provided with a limiting clamping space, the upper end of the longitudinal connecting pipe is connected with the low-temperature pipe, and the longitudinal connecting pipe is vertically inserted into the clamping space. According to the support pipe clamp for axial limiting of the low-temperature pipe, axial deviation of the low-temperature pipe is achieved through the limiting clamping space, and in addition, the low-temperature pipe section can be supported in the vertical direction through clamping; the bottom support can be arranged in the area below the low-temperature pipe, and occupied space on the two sides of the low-temperature pipe is reduced.

Description

Technical Field

[0001] This utility model relates to the field of LNG ships, specifically to a support clamp for axial positioning of cryogenic pipes. Background Technology

[0002] Ships face various harsh sea conditions during navigation, especially LNG carriers. Their cryogenic pipelines must withstand cyclic temperature loads ranging from -163°C to 45°C, resulting in significant stress within the pipelines and at connections to equipment. This is detrimental to the safe navigation of LNG carriers. When the stress in the pipelines is high, it can cause axial displacement of the cryogenic pipes, making them and their connections to equipment prone to damage. Utility Model Content

[0003] To address the issue of axial stress in cryogenic pipes, this invention provides a support clamp for axial positioning of cryogenic pipes. This clamp provides support and fixation for the cryogenic pipes while also allowing for axial displacement of the pipes, thus preventing damage to the pipes.

[0004] The technical objective of this utility model is achieved through the following technical solution:

[0005] A support clamp for axial positioning of a cryogenic tube includes a bottom support and a longitudinal connecting tube. The bottom support is provided with a limiting clamping space for restricting the axial displacement of the cryogenic tube. The upper end of the longitudinal connecting tube is connected to the cryogenic tube, and the longitudinal connecting tube is vertically inserted into the clamping space.

[0006] Furthermore, a polytetrafluoroethylene (PTFE) plate is provided at the position where the longitudinal connecting pipe is clamped in the limiting clamping space. The limiting clamping space directly contacts the longitudinal connecting pipe through the PTFE plate. The PTFE plate can both insulate against low temperatures and reduce wear on the longitudinal connecting pipe.

[0007] Furthermore, the bottom support includes two vertically arranged longitudinal risers, and a transverse limiting tube is respectively arranged near the upper end of each longitudinal riser. One end of the transverse limiting tube is arranged perpendicular to the longitudinal riser, and the other end of the transverse limiting tube is provided with a clamping plate. A limiting clamping space is formed between the clamping plates at the ends of the two transverse limiting tubes, and a polytetrafluoroethylene plate is installed on the clamping plate. The transverse limiting tube is arranged parallel to the cryogenic tube.

[0008] Furthermore, a transverse reinforcing pipe is connected between the two longitudinal risers. The transverse reinforcing pipe is located below the transverse limiting pipe and its end is vertically connected to and fixed to the longitudinal riser.

[0009] Furthermore, the PTFE sheet and the clamping plate are connected by bolts.

[0010] Furthermore, an adjusting shim is provided between the PTFE plate and the clamping plate to adjust the clamping tightness between the PTFE plate and the longitudinal connecting pipe.

[0011] Furthermore, a cladding plate is provided at the upper end of the longitudinal connecting pipe. The cladding plate has an arc surface that matches the outer diameter of the cryogenic pipe. The cladding plate is welded to the cryogenic pipe, and the longitudinal connecting pipe is welded to the cladding plate.

[0012] Furthermore, a clamp is provided at the upper end of the longitudinal connecting pipe. The clamp includes an upper clamp and a lower clamp. The longitudinal connecting pipe is connected and fixed to the lower clamp. The upper clamp and the lower clamp are connected together by bolts.

[0013] Furthermore, the limiting clamping space is provided with a clamping arc surface corresponding to the longitudinal connecting pipe, and the polytetrafluoroethylene plate is provided along the clamping arc surface.

[0014] Compared with the prior art, the beneficial effects of this utility model are that the support clamp for axial positioning of the cryogenic tube achieves axial displacement of the cryogenic tube by limiting the clamping space, and can also provide vertical support for the cryogenic tube segment through clamping; in this utility model, the bottom support can be set in the area below the cryogenic tube, reducing the space occupied on both sides of the cryogenic tube. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the support clamp structure for axial positioning of the cryogenic tube in Embodiment 1 of this utility model.

[0016] Figure 2 This is a schematic diagram of the connection between the longitudinal connecting plate and the low-temperature tube in Embodiment 2 of this utility model.

[0017] Figure 3 This is a schematic diagram of the shape of the limiting clamping space in Embodiment 3 of this utility model.

[0018] In the picture:

[0019] 1. Longitudinal connecting pipe; 2. Low temperature pipe; 3. Sealing plate; 4. Longitudinal riser; 5. Lateral limiting pipe; 6. Clamping plate; 7. Polytetrafluoroethylene plate; 8. Lateral reinforcing pipe; 9. Upper clamp; 10. Lower clamp. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to specific embodiments:

[0021] Example 1

[0022] A type of support clamp for axial positioning of cryogenic tubes, such as Figure 1As shown, the device includes a bottom support and a longitudinal connecting pipe 1. The bottom support is provided with a limiting clamping space to restrict the axial displacement of the cryogenic tube. The upper end of the longitudinal connecting pipe 1 is connected to the cryogenic tube 2, and the longitudinal connecting pipe 1 is vertically inserted into the clamping space. In this embodiment, a cover plate 9 is provided at the upper end of the longitudinal connecting pipe 1. The cover plate 9 has an arc surface adapted to the outer diameter of the cryogenic tube 2. The cover plate 9 is welded to the cryogenic tube 2, and the longitudinal connecting pipe 1 is welded to the cover plate 9.

[0023] Preferably, a sealing plate 3 is also provided at the lower end of the longitudinal connecting pipe 1 to seal the lower end of the longitudinal connecting pipe.

[0024] Specifically, the bottom support includes two vertically arranged longitudinal risers 4. A transverse limiting tube 5 is installed near the upper end of each longitudinal riser 4. One end of the transverse limiting tube 5 is perpendicular to the longitudinal riser 4, and the other end is equipped with a clamping plate 6. A limiting clamping space is formed between the clamping plates 6 at the ends of the two transverse limiting tubes. A polytetrafluoroethylene (PTFE) plate 7 is bolted to the clamping plate inside the clamping space, and the longitudinal connecting tube 1 is clamped by direct contact of the PTFE plate 7. The transverse limiting tubes 5 are parallel to the cryogenic tube 2, and both longitudinal risers 4 are placed within the orthographic projection range of the cryogenic tube 2. Sealing plates are installed at both the upper and lower ends of the longitudinal risers 4. During use, the sealing plate at the lower end of the longitudinal riser 4 is welded to the deck for fixation.

[0025] To increase the structural strength and stability of the bottom support, a transverse reinforcing pipe 8 is connected between the two longitudinal risers 4. The transverse reinforcing pipe 8 is located below the transverse limiting pipe 5 and its end is vertically connected to and fixed to the longitudinal riser 4.

[0026] In this embodiment, the polytetrafluoroethylene plate 7 is a flat plate, the clamping plate 6 adopts a channel steel structure, and an adjusting shim is provided between the polytetrafluoroethylene plate 7 and the clamping plate 6 to adjust the clamping tightness between the polytetrafluoroethylene plate and the longitudinal connecting pipe. By selecting adjusting shims of different thicknesses or changing the number of adjusting shims, the polytetrafluoroethylene plate can clamp the longitudinal connecting pipe 1.

[0027] More specifically, the longitudinal connecting pipe 1, longitudinal riser 4, transverse limiting pipe 5, and transverse reinforcing pipe 7 can be made of ordinary stainless steel pipe, carbon structural steel pipe, or other steel profiles. The cladding plate should be made of the same material as the cryogenic pipe, such as 316L stainless steel.

[0028] To further verify the effectiveness of the support pipe clamp of this utility model, a three-dimensional model of the axially limited support pipe clamp was established using ANSYS software. The three-dimensional coordinates of the three-dimensional model were established, with the X-axis representing the axial direction of the cryogenic pipe, the Y-axis representing the vertical direction, and the Z-axis representing the horizontal direction perpendicular to the X-axis and Y-axis. Theoretical calculations and simulations were performed. The data report of the calculated axial displacement and stress values ​​of the support pipe clamp is shown in the table below. The axial stress in the X-direction is FX = 18.1KN and -FX = 33.3KN. To ensure the effectiveness of practical applications, the larger stress of 33.3KN was selected for simulation calculation.

[0029]

[0030] The connection between the longitudinal connecting pipe 1 and the upper end of the PTFE plate 7 is node 1, and the connection between the transverse limiting pipe 5 and the clamping plate 6 is node 2. The safety factor is 2. During the simulation, the height of the longitudinal riser 4 is 1068mm, and the mesh size is 5.0mm. The three-dimensional model of the support pipe clamp is meshed, and the total deformation, equivalent stress, and equivalent elastic strain are inserted into the scheme information and solved. The stress calculation results are shown in the table below:

[0031] node Calculated stress / MPa Yield strength / MPa Safety factor Allowable stress / MPa Verification results 1 123.61 252.1 2 126.05 conform to 2 113.9 293.5 2 146.8 conform to

[0032] Stress calculations show that the calculated axial stress on the support pipe clamp of this utility model does not exceed the allowable stress range and can meet the usage requirements.

[0033] Example 2

[0034] Unlike Example 1, as Figure 2 As shown, a clamp is provided at the upper end of the longitudinal connecting pipe. The clamp includes an upper clamp 9 and a lower clamp 10. The longitudinal connecting pipe 1 is connected and fixed to the lower clamp 10. The upper clamp 9 and the lower clamp 10 are connected together by bolts.

[0035] Example 3

[0036] Unlike Example 1, as Figure 3 As shown, the limiting clamping space is provided with a clamping arc surface corresponding to the longitudinal connecting pipe. The polytetrafluoroethylene plate is set along the clamping arc surface. When the polytetrafluoroethylene plate is set along the clamping arc surface, it can be a whole plate in an arc shape, or it can be a number of strip polytetrafluoroethylene plates set along the outer wall of the longitudinal connecting pipe 1.

[0037] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make non-inventive modifications to this embodiment as needed, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A support clamp for axial positioning of a cryogenic tube, characterized in that, It includes a bottom support and a longitudinal connecting tube. The bottom support is provided with a limiting clamping space for restricting the axial displacement of the cryogenic tube. The upper end of the longitudinal connecting tube is connected to the cryogenic tube, and the longitudinal connecting tube is vertically inserted into the clamping space.

2. The support clamp for axial positioning of a cryogenic tube according to claim 1, characterized in that, A polytetrafluoroethylene (PTFE) plate is provided at the position where the longitudinal connecting pipe is clamped in the limiting clamping space, and the limiting clamping space directly contacts the longitudinal connecting pipe through the PTFE plate.

3. A support clamp for axial positioning of a cryogenic tube according to claim 2, characterized in that, The bottom support includes two vertically arranged longitudinal risers, and a transverse limiting tube is respectively arranged near the upper end of each longitudinal riser. One end of the transverse limiting tube is arranged perpendicular to the longitudinal riser, and the other end of the transverse limiting tube is provided with a clamping plate. A limiting clamping space is formed between the clamping plates at the ends of the two transverse limiting tubes. The polytetrafluoroethylene plate is installed on the clamping plate. The transverse limiting tube is arranged parallel to the cryogenic tube.

4. A support clamp for axial positioning of a cryogenic tube according to claim 3, characterized in that, A transverse reinforcing pipe is also connected between the two longitudinal risers. The transverse reinforcing pipe is located below the transverse limiting pipe and its end is vertically connected to and fixed to the longitudinal riser.

5. A support clamp for axial positioning of a cryogenic tube according to claim 3, characterized in that, The polytetrafluoroethylene plate and the clamping plate are connected by bolts.

6. A support clamp for axial positioning of a cryogenic tube according to claim 5, characterized in that, An adjusting shim is also provided between the polytetrafluoroethylene plate and the clamping plate to adjust the clamping tightness between the polytetrafluoroethylene plate and the longitudinal connecting pipe.

7. A support clamp for axial positioning of a cryogenic tube according to claim 1, characterized in that, The upper end of the longitudinal connecting pipe is provided with a cladding plate, the cladding plate having an arc surface adapted to the outer diameter of the cryogenic pipe, the cladding plate being welded to the cryogenic pipe, and the longitudinal connecting pipe being welded to the cladding plate.

8. A support clamp for axial positioning of a cryogenic tube according to claim 1, characterized in that, The upper end of the longitudinal connecting pipe is provided with a clamp, which includes an upper clamp and a lower clamp. The longitudinal connecting pipe is connected and fixed to the lower clamp, and the upper clamp and the lower clamp are connected together by bolts.

9. A support clamp for axial positioning of a cryogenic tube according to claim 2, characterized in that, The limiting clamping space is provided with a clamping arc surface corresponding to the longitudinal connecting pipe, and the polytetrafluoroethylene plate is provided along the clamping arc surface.

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