Marine liquefied natural gas vacuum heat insulation pipe

Abstract

The utility model relates to the technical field of vacuum heat insulation pipes, and particularly discloses a marine liquefied natural gas vacuum heat insulation pipe which comprises an inner pipe, an outer pipe and an air exhaust nozzle. The inner pipe and the outer pipe form a concentric pipe structure; the two ends of the outer pipe are fixedly connected with the inner pipe, and a sealing cavity is formed between the outer pipe and the inner pipe. A plurality of ring bodies are fixedly arranged on the outer wall of the inner pipe, a plurality of supporting covers are arranged in the sealing cavity, the supporting covers are arranged in a horn shape, the tip ends of the supporting covers abut against the inner pipe, and the flaring ends of the supporting covers are fixedly connected with the outer pipe; a plurality of accommodating cavities are formed between the plurality of supporting covers and the outer pipe, and the plurality of accommodating cavities are communicated with the sealing cavity; one end of the air exhaust nozzle is located in one containing cavity, and the other end of the air exhaust nozzle is located outside the outer pipe. The marine liquefied natural gas vacuum heat insulation pipe is high in overall structural strength and good in mechanical property.

Description

TECHNICAL FIELD

[0001] The utility model relates to vacuum heat insulation pipe technical field, concretely relates to a marine liquefied natural gas vacuum heat insulation pipe. BACKGROUND

[0002] Liquefied natural gas transport ship is called LNG ship for short, and mainly transports liquefied natural gas. The main component of liquefied natural gas is methane, and in order to facilitate transportation, it is usually liquefied by using the method of extremely low temperature (-165 DEG C) freezing under normal pressure. As the low-temperature pipeline commonly used in LNG ships, the main function of the vacuum heat insulation pipe is to effectively reduce the heat absorption and evaporation of the liquid in the conveying process and reduce the loss of LNG. The strength of the vacuum heat insulation pipe is an important performance parameter.

[0003] The patent with publication number CN109084103B discloses a kind of vacuum heat insulation pipe, it is provided with support between inner tube and outer tube, strengthen the support strength between outer tube and inner tube, avoid when vacuumizing, gas pressure will outer tube and inner tube be pressed tightly, improve the overall stress performance;Since support is directly connected with inner tube, so when outer tube is impacted, force will be directly dispersed to inner tube, there is the risk that inner tube is pressed, therefore it is necessary to improve. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of marine liquefied natural gas vacuum heat insulation pipe for solving the above-mentioned technical problem, and the overall structural strength is high, and mechanical property is good.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of marine liquefied natural gas vacuum heat insulation pipe, including inner tube, outer tube and gas extraction nozzle.

[0007] The outer tube is located at the outer periphery of the inner tube, and the inner tube and the outer tube form a concentric tube structure.

[0008] Both ends of the outer tube are fixedly connected with the inner tube, and a sealed cavity is formed between the outer tube and the inner tube.

[0009] A plurality of annular bodies are fixedly arranged on the outer wall of the inner tube, a plurality of support covers are arranged in the sealed cavity, the support covers are arranged in a horn shape, the tip of the support cover abuts against the inner tube, and the flared end of the support cover is fixedly connected with the outer tube.

[0010] A plurality of accommodating cavities are formed between the plurality of support covers and the outer tube, and the plurality of accommodating cavities are in communication with the sealed cavity.

[0011] The gas extraction nozzle is fixedly connected with the outer tube, one end of the gas extraction nozzle is located in one of the accommodating cavities, and the other end of the gas extraction nozzle is located outside the outer tube.

[0012] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein the plurality of ring bodies are distributed at equal intervals, and the plurality of support covers are distributed at equal intervals.

[0013] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein a cross section of the ring body is arranged in a streamline shape.

[0014] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein a plurality of air holes are arranged on the support cover, and the containing cavity and the sealing cavity are communicated through the air holes.

[0015] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein the plurality of support covers abutting the same ring body are arranged in a circular array with the center of the ring body as the center.

[0016] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein the ring body is a heat insulation ring body, and the support cover is a heat insulation support cover.

[0017] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein both ends of the inner pipe are provided with flange plates, the outer pipe is welded to the flange plates, and the inner pipe is welded to the flange plates.

[0018] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein the inner pipe and / or the outer pipe is a heat insulation pipe.

[0019] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein the air exhaust nozzle is not in contact with the support cover.

[0020] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, further comprising a heat insulation cover.

[0021] The heat insulation cover is detachably connected to the outer pipe, and the heat insulation cover is used for covering the air exhaust nozzle.

[0022] At least one embodiment of the present disclosure provides a marine liquefied natural gas vacuum insulated pipe, wherein a connecting pipe is arranged on the outer pipe, the connecting pipe is fixedly connected to the outer pipe, the air exhaust nozzle is located in an area surrounded by the connecting pipe, and the heat insulation cover is threadedly connected to the connecting pipe.

[0023] The present utility model discloses the beneficial effect is: through the ring body and the support cover who is arranged between the inner pipe and the outer pipe, can effectively promote the overall structural strength, and the overall mechanical property is good, and simultaneously, the support cover does not directly contact the inner pipe, can avoid the stress point directly exerting on the inner pipe, can reduce the pressure loss of the inner pipe. BRIEF DESCRIPTION OF DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a partial cross-sectional view of the marine liquefied natural gas vacuum insulation pipe in Example 1.

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0027] Figure 3 This is a three-dimensional view of the support cover.

[0028] Figure 4 This is a partial cross-sectional view of the marine liquefied natural gas vacuum insulation pipe in Example 2.

[0029] In the picture:

[0030] 10. Inner tube; 11. Ring body; 12. Flange plate;

[0031] 20. Outer tube; 21. Sealing cavity; 22. Connecting tube;

[0032] 30. Air extraction nozzle;

[0033] 40. Support cover; 41. Receiving cavity; 42. Air vent;

[0034] 50. Heat insulation cover. Detailed Implementation

[0035] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments, not all embodiments.

[0036] Example 1

[0037] like Figures 1 to 3 As shown, this embodiment provides a marine liquefied natural gas vacuum insulation pipe, including an inner pipe 10, an outer pipe 20, and an extraction nozzle 30.

[0038] Specifically, the outer tube 20 is located on the outer periphery of the inner tube 10, and the inner tube 10 and the outer tube 20 form a concentric tube structure. Both ends of the outer tube 20 are fixedly connected to the inner tube 10, and a sealed cavity 21 is formed between the outer tube 20 and the inner tube 10.

[0039] Specifically, a plurality of annular bodies 11 are fixedly arranged on the outer wall of the inner tube 10, and a plurality of supporting covers 40 are arranged in the sealing cavity 21, the supporting covers 40 are arranged in a trumpet shape, the tip of the supporting cover 40 abuts against the inner tube 10, and the flared end of the supporting cover 40 is fixedly connected with the outer tube 20.

[0040] The annular body 11 and the supporting cover 40 are arranged between the inner tube 10 and the outer tube 20, which can effectively improve the overall structural strength and the overall mechanical property; meanwhile, the supporting cover 40 does not directly contact the inner tube, so that the stress point is not directly applied to the inner tube, and the pressure loss of the inner tube can be reduced.

[0041] In addition, when the vacuum insulation pipe is subjected to a severe impact, the supporting cover 40 can play a buffering role through deformation when the stress reaches a certain degree.

[0042] Specifically, a plurality of accommodating cavities 41 are formed between the plurality of supporting covers 40 and the outer tube 20, and the plurality of accommodating cavities 41 are all in communication with the sealing cavity 21. The air exhaust nozzle 30 is fixedly connected with the outer tube 20, one end of the air exhaust nozzle 30 is located in one of the accommodating cavities 41, and the other end of the air exhaust nozzle 30 is located outside the outer tube 20. The air exhaust nozzle 30 does not contact the supporting cover 40.

[0043] Since one end of the air exhaust nozzle 30 is located in the accommodating cavity 41, even if the outer tube is deformed under pressure, the air exhaust nozzle 30 will not directly impact the inner tube, and the safety is high. Meanwhile, the air exhaust nozzle 30 is isolated in the accommodating cavity 41, which is conducive to heat insulation.

[0044] In the embodiment, the plurality of annular bodies 11 are equally spaced, and the plurality of supporting covers 40 are equally spaced.

[0045] In the embodiment, the cross section of the annular body 11 is arranged in a streamline shape. The annular body 11 adopts a streamline design, which can facilitate the supporting cover 40 to pass through during installation.

[0046] In the embodiment, a plurality of air holes 42 are arranged on the supporting cover 40, and the accommodating cavity 41 and the sealing cavity 21 are in communication through the air holes 42.

[0047] In the embodiment, the plurality of supporting covers 40 abutting against the same annular body 11 are arranged in a circular array with the center of the annular body 11 as the center.

[0048] In the embodiment, the annular body 11 is a heat-insulating plastic ring with a foaming structure, and the supporting cover 40 is a foamed aluminum with a foaming structure.

[0049] For example, the heat-insulating plastic ring with a foaming structure is bonded with the inner tube, and the foamed aluminum supporting cover is bonded with the outer tube.

[0050] In the embodiment, both ends of the inner tube 10 are provided with flange plates 12, the inner tube 10 is welded to the flange plate 12, and the outer tube 20 is welded to the flange plate 12.

[0051] Embodiment 2

[0052] As Figure 4 shown, the embodiment provides a marine liquefied natural gas vacuum insulated pipe, which is different from the embodiment 1 in that it further comprises: an insulation cover 50.

[0053] The insulation cover 50 is detachably connected with the outer pipe 20, and the insulation cover 50 is used to cover the suction nozzle 30.

[0054] Exemplarily, the outer pipe 20 is provided with a connecting pipe 22, the connecting pipe 22 is fixedly connected with the outer pipe 20, the suction nozzle 30 is located in an area surrounded by the connecting pipe 22, and the insulation cover 50 is threadedly connected with the connecting pipe 22.

[0055] By being provided with the insulation cover 50, heat can be effectively prevented from being transmitted into the containing cavity 41 through the suction nozzle 30.

[0056] Embodiment 3

[0057] The embodiment provides a marine liquefied natural gas vacuum insulated pipe, which is different from the embodiment 1 in that the inner pipe is an insulation pipe.

[0058] Exemplarily, the main body of the inner pipe is a stainless steel pipe, and a first insulation layer (not shown) is arranged on the outer wall of the stainless steel pipe.

[0059] Embodiment 4

[0060] The embodiment provides a marine liquefied natural gas vacuum insulated pipe, which is different from the embodiment 1 in that the outer pipe is an insulation pipe.

[0061] Exemplarily, the main body of the outer pipe is a stainless steel pipe, and a second insulation layer (not shown) is arranged on the inner wall and the outer wall of the stainless steel pipe.

[0062] Although the embodiments of the present application have been shown and described above, the protection scope of the present application is not limited thereto, and any change or replacement not through creative labor should be covered in the protection scope of the present application; unless explicitly stated, any element, action or instruction used in the present application should not be interpreted as critical or necessary.

Claims

1. A marine liquefied natural gas vacuum insulated pipe, characterized by, The utility model relates to a kind of exhaust pipe, comprising: Inner tube, outer tube and suction nozzle; The outer tube is located at the outer periphery of the inner tube, and the inner tube and the outer tube constitute a concentric tube structure; Both ends of the outer tube are fixedly connected with the inner tube, and a sealed cavity is formed between the outer tube and the inner tube; A plurality of annular bodies are fixedly arranged on the outer wall of the inner tube, a plurality of support covers are arranged in the sealed cavity, the support covers are arranged in a horn shape, the tips of the support covers abut against the inner tube, and the flared ends of the support covers are fixedly connected with the outer tube; A plurality of accommodating cavities are formed between the support covers and the outer tube, and the accommodating cavities are in communication with the sealed cavity. The suction nozzle is fixedly connected with the outer tube, one end of the suction nozzle is located in one of the accommodating cavities, and the other end of the suction nozzle is located outside the outer tube.

2. A marine LNG vacuum insulated pipe according to claim 1, characterized in that The annular bodies are equally spaced, and the support covers are equally spaced.

3. A marine LNG vacuum insulated pipe according to claim 2, characterized in that The cross section of the annular body is arranged in a streamline shape.

4. The marine LNG vacuum insulated pipe of claim 1, wherein, A plurality of air holes are arranged on the support cover, and the accommodating cavities and the sealed cavity are in communication through the air holes.

5. The marine LNG vacuum insulated tube of claim 1, wherein, The support covers on the same annular body are arranged in a circular array with the center of the annular body.

6. A marine LNG vacuum insulated tube according to claim 1, characterized in that, The annular body is a heat-insulating annular body, and the support cover is a heat-insulating support cover.

7. A marine LNG vacuum insulated tube according to claim 1, characterized in that, Both ends of the inner tube have flange plates, the outer tube is welded to the flange plates, and the inner tube is welded to the flange plates.

8. The marine LNG vacuum insulated tube of claim 1, wherein, The inner tube and / or the outer tube are heat-insulating pipes.

9. A marine LNG vacuum insulated tube according to claim 1, characterized in that, The suction nozzle does not contact the support cover.

10. The marine LNG vacuum insulated tube of claim 1, wherein, Further comprising: Heat-insulating cover; The heat-insulating cover is detachably connected with the outer tube, and the heat-insulating cover is used to cover the suction nozzle.

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