CN111306442A

CN111306442A - Low-temperature storage tank

Info

Publication number: CN111306442A
Application number: CN201811517281.2A
Authority: CN
Inventors: 李晓晨; 刘东进; 范洪军; 甘少炜; 徐小艳; 尹红伟; 顾华; 马金华; 杨阳; 姚龙
Original assignee: China International Marine Containers Group Co Ltd; Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd; CIMC Enric Holding Shenzhen Co Ltd
Current assignee: China International Marine Containers Group Co Ltd; Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd; CIMC Enric Holding Shenzhen Co Ltd
Priority date: 2018-12-12
Filing date: 2018-12-12
Publication date: 2020-06-19
Anticipated expiration: 2038-12-12
Also published as: CN111306442B

Abstract

The invention relates to the technical field of LNG (liquefied natural gas), in particular to a low-temperature storage tank. The radar liquid level gauge comprises an inner tank, a shell, a displacement compensation piece, a radar liquid level gauge and a connecting assembly; the displacement compensation piece is fixed above the top surface of the shell; the radar liquid level meter comprises a flange component and a waveguide pipe fixedly connected with the flange component; the waveguide tube penetrates into the inner tank; the connecting component is sleeved on the waveguide tube; the connection assembly includes a transition joint located above the displacement compensator, and an inner nipple located in the displacement compensator; the upper end of the transition joint is fixedly connected with the flange assembly; the lower end of the transition joint is fixedly connected with the displacement compensation assembly, and the lower end of the transition joint is fixedly connected with the inner connecting pipe; the inner connecting pipe passes through the top wall of the outer shell to be connected with the top wall of the inner tank, and the lower end of the inner connecting pipe is communicated with the space in the inner tank; the stresses generated by the movement of the inner joint are transmitted to the upper end of the displacement compensator through the transition joint. The temperature difference stress can not be transferred to the flange assembly, and the hidden trouble of natural gas leakage is eliminated.

Description

Low-temperature storage tank

Technical Field

The invention relates to the technical field of LNG (liquefied natural gas), in particular to a low-temperature storage tank.

Background

At present, in order to meet the increasingly severe environmental challenges and reduce the sulfur oxide emissions in pollution emission control areas, the International Maritime Organization (IMO) has set a series of regulations to control environmental pollution, and natural gas is used as a clean energy source and is more economical than traditional fuels such as diesel oil, so the LNG fuel-powered ship develops rapidly in recent years. Where LNG refers to Liquefied Natural Gas (Liquefied Natural Gas).

Meanwhile, the LNG fuel tank is used as storage equipment of engine fuel, and a C-type vacuum storage tank is basically adopted. The traditional C-shaped single-layer storage tank is a single-layer container, the surface of the traditional C-shaped single-layer storage tank is provided with a layer of insulating material, and the traditional C-shaped single-layer storage tank is suitable for large storage media with the storage volume larger than one thousand cubic meters; the instrument is relatively simple and convenient to install on the top of the C-type single-layer storage tank, and the application is mature. When used for storing media with a volume of hundreds of cubic meters or even tens of cubic meters, the use of a C-type double-deck vacuum tank is more appropriate. The C-type double-layer vacuum storage tank consists of an inner tank and an outer shell, wherein the inner tank is used for storing media, and a vacuum layer is formed between the inner tank and the outer shell.

When the C-type double-layer vacuum storage tank is used for the first time, the inner tank enters a low-temperature state, the shell still keeps normal temperature, and the relative displacement between the inner tank and the shell is caused by huge temperature difference stress caused at the moment; in addition, in the process of using the C-shaped double-layer vacuum storage tank, the temperature change and the pressure change of the inner tank can cause larger alternating fatigue load when the C-shaped double-layer vacuum storage tank is repeatedly filled and drained, so that the risk of breakage or vacuum loss of the interlayer connecting pipe at the top of the storage tank is greatly increased, and the service life of the C-shaped double-layer vacuum storage tank is influenced.

The mainstream liquid level measurement mode of the current C-type double-layer vacuum storage tank is as follows: the thin pipes are respectively led out from the top and the bottom of the inner tank, and are connected to a differential pressure type liquid level meter, and the liquid column height is calculated by measuring the pressure difference at the top and the bottom of the inner tank, so that the liquid level height is calculated. The mode of calculating the liquid level height of the inner tank by using the differential pressure liquid level meter is more accurate when the device is fixedly used on the land. However, if the liquid level height calculation method is applied to the LNG-fueled ship, the liquid column height of the differential pressure level gauge changes constantly due to the sloshing state of the LNG-fueled ship and the large sloshing amplitude, so that the differential pressure level gauge cannot accurately and sensitively reflect the liquid level value.

A few radar liquid level meters are also applied to the C-type double-layer vacuum storage tank in the following modes: the radar liquid level meter and the waveguide tube thereof are of an integrated structure, and the waveguide tube extends into the tank bottom from the top of the C-shaped double-layer vacuum storage tank during installation. The lower flange of the radar liquid level meter is welded with a connecting pipe extending from the inner tank and is welded with the upper end of the corrugated pipe. Under the action of temperature difference stress, the takeover moves downwards, the downside flange receives decurrent effort thereupon, the bellows shrink is in order to eliminate the effort that the downside flange received, consequently, the welding part of downside flange and takeover and the welding part of downside flange and bellows all can take place great deformation, can't guarantee the rigidity after this downside flange is dragged, and then this downside flange appears the gap in case take place to warp slightly and will lead to between the upside flange of radar level gauge and the downside flange, there is the natural gas from this and outwards leaks the hidden danger through the gap between takeover and two flanges.

Disclosure of Invention

The invention aims to provide a liquid level meter for a low-temperature storage tank, which aims to solve the problem that natural gas leakage hidden danger exists in a radar liquid level meter applied to a ship in the prior art.

The purpose of the invention is realized by the following technical scheme:

the invention provides a low-temperature storage tank, which comprises an inner tank, an outer shell, a displacement compensation piece, a radar liquid level meter and a connecting assembly, wherein the inner tank is connected with the outer shell; the outer shell is sleeved on the inner tank; the displacement compensation piece is fixed above the top surface of the shell; the radar liquid level meter comprises a flange component positioned above the displacement compensation part and a waveguide pipe fixedly connected with the flange component; the wave guide tube penetrates into the inner tank; the connecting component is sleeved on the waveguide tube; the connection assembly includes a transition joint located above the displacement compensator, and an inner nipple located in the displacement compensator; the upper end of the transition joint is fixedly connected with the flange assembly; the lower end of the transition joint is fixedly connected with the displacement compensation assembly, and the lower end of the transition joint is fixedly connected with the inner connecting pipe; the inner joint pipe is connected to the top wall of the inner tank through the top wall of the outer shell, and the lower end of the inner joint pipe is communicated with the space in the inner tank; the stresses generated by the movement of the inner joint are transmitted to the upper end of the displacement compensator through the transition joint.

Preferably, the connecting assembly further comprises a connecting shell ring sleeved at the upper end of the inner connecting pipe; the transition joint is connected with the displacement compensation part through the connecting shell ring.

Preferably, the connecting assembly further comprises an external connection tube sleeved on the waveguide tube; the transition joint is fixedly connected with the flange assembly through the external connecting pipe.

Preferably, the transition joint is an integrally formed structure; the transition joint comprises an outer pipe, an inner pipe and a connecting ring sleeve; the lower end of the outer pipe is fixedly connected with the connecting shell ring; an inner tube is located in the outer tube; the upper end of the inner pipe is fixedly connected with the outer connecting pipe, and the lower end of the inner pipe is fixedly connected with the inner connecting pipe; a connection collar formed between the outer tube and the inner tube to fix the outer tube and the inner tube; the connecting ring sleeve is annular.

Preferably, the outer end of the connection collar has a first rounded transition corner and the inner end of the connection collar has a second rounded transition corner.

Preferably, the outer end of the connecting ring sleeve is of a gradually thickened structure along the direction close to the outer pipe; the inner end of the connecting ring sleeve is of a gradually thickened structure along the direction close to the inner pipe.

Preferably, the flange assembly comprises a first flange, a second flange located below the first flange, and a third flange located below the second flange; the second flange is detachably connected with the first flange and fixedly connected with the upper end of the waveguide tube; the third flange is connected with the second flange in a sealing manner and is fixedly connected with the upper end of the transition joint; the radar level gauge further comprises a radar detection part fixed on the top surface of the first flange.

Preferably, a fixing assembly for fixing the waveguide tube is further included; the fixing component is fixed in the inner tank.

Preferably, the fixing assembly comprises a support rod positioned in the inner tank and a plurality of pipe clamps arranged on the support rod at intervals; two ends of the supporting rod are respectively connected and fixed with the top wall and the bottom wall of the inner tank; and each pipe clamp is fixedly connected with the waveguide pipe.

Preferably, the joint assembly is fixed on the inner tank and the outer shell; the joint assembly comprises an inner tank joint and an outer tank joint; the inner tank joint is arranged on the top wall of the inner tank in a penetrating way and is fixedly connected with the lower end of the inner connecting pipe; the inner tank joint is used for the waveguide tube to penetrate through; the outer tank joint is arranged on the top wall of the shell in a penetrating way; the outer tank joint is penetrated by the inner connecting pipe; the outer tank joint is fixedly connected with the lower end of the displacement compensation piece.

According to the technical scheme, the invention has the advantages and positive effects that: a flange component in the radar liquid level meter is fixedly connected with a waveguide tube, the flange component is connected with a transition joint below the flange component, and an inner connecting tube is arranged at the lower end of the transition joint; the inner pipe passes through the top of the outer shell to be connected with the top wall of the inner tank, and the inner pipe is communicated with the space in the inner tank; the inner connecting pipe is positioned in the displacement compensation part; the displacement compensation piece is fixed between the shell and the transition joint and is fixedly connected with the transition joint; the wave guide pipe sequentially passes through the transition joint and the inner connecting pipe from top to bottom to enter the inner tank; when the low-temperature storage tank is used for the first time, the inner tank enters a low-temperature state, the shell still keeps normal temperature, and the temperature difference stress can be caused at the moment, so that relative displacement is generated between the inner tank and the shell; the top of the inner tank drives the inner connecting pipe to move downwards, at the moment, the inner connecting pipe applies a downward acting force to the transition joint, the transition joint moves downwards along with the downward acting force to the displacement compensation piece below the transition joint, the displacement compensation piece eliminates the downward acting force, and the flange assembly moves downwards along with the transition joint; therefore, the temperature difference stress generated by the low-temperature storage tank is eliminated by the inner connecting pipe, the transition joint and the displacement compensation piece, and cannot be transferred to the flange assembly, so that the hidden danger that natural gas in the inner tank is leaked outwards by the flange assembly is eliminated.

Drawings

For the purpose of easy explanation, the present invention will be described in detail with reference to the following preferred embodiments and the accompanying drawings.

FIG. 1 is a schematic structural diagram of a preferred embodiment of the cryogenic storage tank of the present invention;

fig. 2 is a schematic structural view of a connection assembly of the cryogenic tank shown in fig. 1.

Description of reference numerals: 1. an inner tank; 11. a manhole; 2. a housing; 3. a displacement compensator; 31. a first shell ring; 32. a second shell ring; 33. a third shell ring; 4. a radar level gauge; 41. a radar detection section; 42. a flange assembly; 421. a first flange; 422. a second flange; 423. a third flange; 43. a waveguide tube; 5. a connecting assembly; 51. an external connection pipe; 52. a transition joint; 521. an outer tube; 522. an inner tube; 523. a connecting ring sleeve; 524. a first transition fillet; 525. a second transition fillet; 53. an inner connecting pipe; 54. connecting the shell ring; 6. a fixing assembly; 61. a support bar; 62. a pipe clamp; 7. a joint assembly; 71. an inner tank joint; 72. an outer tank joint.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides a low-temperature storage tank. Referring to fig. 1, in the present embodiment, the cryogenic storage tank includes an inner tank 1, an outer shell 2, a displacement compensator 3, a radar level gauge 4, a connecting assembly 5, a fixing assembly 6, and a joint assembly 7. The low-temperature storage tank is a horizontal low-temperature storage tank.

The inner tank 1 is used for containing cryogenic liquid, and a manhole 11 is opened on one end of the inner tank 1. The manhole 11 of the inner tank 1 is located at one end which is a movable end, and the other end of the inner tank 1 is a fixed end. A first mounting opening is formed in the top wall of the inner tank 1.

The outer shell 2 is sleeved outside the inner tank 1, and an interlayer space is arranged between the outer shell 2 and the inner tank 1. A second mounting opening is formed in the top wall of the shell 2; the second mounting opening is positioned right above the first mounting opening, and the caliber of the second mounting opening is larger than that of the first mounting opening.

The connecting member 5 is fitted over the waveguide 43. The connection assembly 5 includes an extension tube 51, a transition joint 52, an inner tube 53, and a connection hub 54. Wherein, the external connecting pipe 51, the transition joint 52 and the connecting shell ring 54 are arranged and distributed from top to bottom in sequence.

Referring to fig. 2, the transition joint 52 is an integrally formed structure, and specifically, the transition joint 52 is made of a forged material. The transition joint 52 includes an outer tube 521, an inner tube 522 positioned within the outer tube 521, and a connecting collar 523 formed between the outer tube 521 and the inner tube 522. The outer pipe 521 is arranged coaxially with the inner pipe 522. The connection collar 523 is annular and serves to secure the outer pipe 521 and the inner pipe 522 together.

The outer end of the connecting ring 523 is welded and fixed to the upper end of the outer tube 521, and the outer end of the connecting ring 523 is gradually thickened along the direction close to the outer tube 521. The connection of the connection collar 523 and the outer pipe 521 has a first transition round corner 524, i.e., the bottom surface of the outer end of the connection collar 523 has a first transition round corner 524. Specifically, the longitudinal section of the outer end of the connecting loop 523 is shaped like a right trapezoid, and a first transition fillet 524 is formed on the hypotenuse of the right trapezoid.

The inner end of the connection ring 523 is welded to the middle portion of the inner tube 522, and the inner end of the connection ring 523 has a structure that is gradually thickened in a direction close to the inner tube 522. The connection of the connection collar 523 to the inner pipe 522 has a second transition radius 525, i.e., the top and bottom surfaces of the inner end of the connection collar 523 have second transition radii 525. Specifically, the longitudinal section of the inner end of the connecting ring sleeve 523 is shaped like an isosceles trapezoid, and the corner where the oblique side of the isosceles trapezoid is connected with the middle part of the connecting ring sleeve 523 and the corner where the oblique side of the isosceles trapezoid is connected with the inner pipe 522 are both formed with the second transition rounded corner 525. The outer end of the connection loop 523 refers to an end of the connection loop 523 near the outer tube 521, and similarly, the inner end of the connection loop 523 refers to an end of the connection loop 523 near the inner tube 522.

Referring to fig. 1, the lower end of the external pipe 51 is welded to the upper end of the internal pipe 522. The upper end of the inner pipe 53 is located in the connecting boss 54 and is welded and fixed to the lower end of the inner pipe 522. The lower end of the inner joint pipe 53 communicates with the space in the inner vessel 1 through the top wall of the outer shell 2.

The connecting cylindrical section 54 is fitted over the upper end of the inner joint pipe 53. The upper end of the connecting shell ring 54 is welded and fixed with the lower end of the outer pipe 521.

The joint assembly 7 includes an inner tank joint 71 welded to the first mounting port and an outer tank joint 72 welded to the second mounting port. The inner tank joint 71 and the outer tank joint 72 are both made of forged materials.

The inner vessel joint 71 is inserted through the top wall of the inner vessel 1 and is fixedly coupled to the lower end of the inner joint pipe 53 such that the inner joint pipe 53 moves in synchronization with the top wall of the inner vessel 1.

The outer tank joint 72 is arranged on the top wall of the shell 2 in a penetrating way; the outer tank joint 72 is penetrated by the inner joint pipe 53.

The displacement compensator 3 is sleeve-shaped and has a chamfer. The displacement compensator 3 is fitted around the inner joint pipe 53. The upper end of the displacement compensator 3 is welded to the lower end of the connecting shell 54, and the lower end of the displacement compensator 3 is welded to the upper end of the outer tank joint 72. The upper end of the displacement compensator 3 is welded to the lower end of the connecting shell 54 by butt welding, and the lower end of the displacement compensator 3 is welded to the upper end of the outer tank joint 72 by butt welding. Depending on the stress regime, one or more displacement compensators 3 may be employed. In this embodiment, two displacement compensators 3 are used. The two displacement compensators 3 are arranged up and down symmetrically.

Each displacement compensator 3 comprises a first shell ring 31, a second shell ring 32 and a third shell ring 33 fixed between the first shell ring 31 and the second shell ring 32. The first shell ring 31 and the second shell ring 32 are both cylindrical, and the caliber of the first shell ring 31 is larger than that of the second shell ring 32.

The third shell ring 33 is frustum-shaped. The caliber of the first port of third cylindrical section 33 is greater than the caliber of the second port, and the caliber of the first port of third cylindrical section 33 is equal to the caliber of first cylindrical section 31, and the caliber of the second port of third cylindrical section 33 is equal to the caliber of second cylindrical section 32. The third cylindrical section 33 of the displacement compensation member 3 is chamfered, so that stress concentration caused by shrinkage of the inner tank 1 can be avoided, and the purpose of performing displacement compensation on the inner connecting pipe 53 is achieved.

The first shell ring 31 of the two displacement compensators 3 is welded. The second shell ring 32 of the upper displacement compensator 3 is welded and fixed to the lower end of the connecting shell ring 54. The second shell ring 32 of the lower displacement compensator 3 is welded and fixed to the upper end of the outer tank joint 72.

The radar level gauge 4 adopts a split type structure. The radar level gauge 4 can accurately measure the liquid level in the inner tank. The radar level gauge 4 comprises a radar detection part 41, a flange assembly 42 and a waveguide pipe 43.

Wherein the radar detection part 41 and the flange assembly 42 are both located above the top surface of the housing 2.

The flange assembly 42 includes a first flange 421 fixed on the lower end of the radar detection part 41, a second flange 422 located below the first flange 421, and a third flange 423 located below the second flange 422.

The second flange 422 is fixedly connected with the upper end of the waveguide tube 43; the second flange 422 is detachably connected to the first flange 421, and the second flange 422 is hermetically connected to the first flange 421.

The third flange 423 is removably coupled to the second flange 422 and a top surface of the third flange 423 sealingly engages a bottom surface of the second flange 422. The third flange 423 is a neck flange, and the neck end of the third flange 423 is connected with the upper end of the external connecting pipe 51 in a full-penetration-butt welding manner.

The waveguide pipe 43 passes through the external connection pipe 51, the transition joint 52, the internal connection pipe 53 and the internal tank joint 71 in this order from top to bottom into the internal tank 1 to contact the cryogenic liquid in the internal tank 1.

The transition joint 52 thus closes off the upper end opening of the connecting shell 54, so that the space between the connecting shell 54 and the inner pipe 53, the space between the displacement compensator 3 and the inner pipe 53, the space between the outer tank joint 72 and the inner pipe 53, and the interlayer space together constitute a closed space.

The upper port of the external connecting pipe 51 is sealed by the cooperation of the second flange 422 and the third flange 423; the space between the outer tube 51 and the waveguide 43, the space between the transition joint 52 and the waveguide 43, the space between the inner tube 53 and the waveguide 43, the space between the inner tank joint 71 and the waveguide 43, and the space in the inner tank 1 together constitute a closed space.

The fixing unit 6 is fixed to the inner vessel 1 and fixes the waveguide 43. The fixing assembly 6 includes a support rod 61 positioned in the inner vessel 1, and a plurality of pipe clamps 62 spaced apart on the support rod 61.

The two ends of the support rod 61 are respectively connected and fixed with the top wall and the bottom wall of the inner tank 1. The pipe clamps 62 are uniformly arranged, and each pipe clamp 62 is fixedly connected with the waveguide 43, so that the waveguide 43 is firmly fixed in the inner tank 1, and the influence on the measurement accuracy of the radar liquid level meter 4 caused by the shaking and the slanting of the waveguide 43 is prevented. After the inner vessel 1 is manufactured, a worker enters through the manhole 11 to fix the waveguide pipe 43 and the pipe clamp 62, and then the manhole 11 is sealed by welding with a cap. Of course, the fixing component may also adopt a bracket with other structures, and is not limited by the structure of the supporting rod 61, and only needs to fix the waveguide tube.

Referring to fig. 1 and fig. 2, the working principle of the present invention is: the flange assembly 42 of the radar level gauge 4 is fixedly connected to the waveguide 43, the flange assembly 42 is connected to a transition joint 52 therebelow, and an inner connecting pipe 53 is mounted at the lower end of the transition joint 52. The inner pipe 53 is connected to the top wall of the inner tank 1 through the top of the outer shell 2, and the inner pipe 53 communicates with the space in the inner pipe 522; the inner nipple 53 is located in the displacement compensator 3. The displacement compensator 3 is positioned between the shell 2 and the transition joint 52, and the displacement compensator 3 is fixedly connected with the transition joint 52; the waveguide 43 passes through the transition joint 52 and the inner joint 53 in this order from top to bottom into the inner vessel 1. When the low-temperature storage tank is used for the first time, the inner tank 1 enters a low-temperature state, the outer shell 2 still keeps normal temperature, and the temperature difference stress caused at the moment causes relative displacement between the inner tank 1 and the outer shell 2; the top of inner tank 1 carries inner pipe 53 to move downwards, and when inner pipe 53 exerts a downward force on transition joint 52, transition joint 52 moves downwards along with it and exerts a downward force on displacement compensator 3 below it, and displacement compensator 3 eliminates the downward force, and flange assembly 42 moves downwards along with transition joint 52; therefore, the temperature difference stress generated by the low-temperature storage tank is eliminated by the inner connecting pipe 53, the transition joint 52 and the displacement compensation piece 3 and cannot be transferred to the flange assembly 42, and the hidden trouble that the natural gas in the inner tank 1 leaks outwards from the flange assembly 42 is eliminated.

The invention has at least the following advantages:

firstly, the temperature difference stress generated by the low-temperature storage tank is eliminated by the inner connecting pipe 53, the transition joint 52 and the displacement compensation piece 3 and cannot be transferred to the flange assembly 42, so that the hidden trouble that the natural gas in the inner tank 1 leaks outwards from the flange assembly 42 is eliminated.

Secondly, the radar level gauge 4 adopts a split type structure, and the waveguide tube 43 is of a pure mechanical structure, so that maintenance is not required after installation. When the radar detection part 41 breaks down, only the first flange 421 and the second flange 422 need to be separated, and the radar detection part 41 can be detached, so that the radar detection part 41 can be repaired or replaced without influencing the normal use of the low-temperature storage tank.

Furthermore, the low-temperature storage tank of the present invention can be applied to a ship that is in motion by the fixing action of the fixing member 6 on the waveguide 43.

In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A cryogenic storage tank, comprising:

an inner tank;

the outer shell is sleeved on the inner tank;

the displacement compensation piece is fixed above the top surface of the shell;

the radar liquid level meter comprises a flange component positioned above the displacement compensation part and a waveguide pipe fixedly connected with the flange component; the wave guide tube penetrates into the inner tank;

the connecting component is sleeved on the waveguide tube; the connection assembly includes a transition joint located above the displacement compensator, and an inner nipple located in the displacement compensator; the upper end of the transition joint is fixedly connected with the flange assembly; the lower end of the transition joint is fixedly connected with the displacement compensation assembly, and the lower end of the transition joint is fixedly connected with the inner connecting pipe; the inner joint pipe is connected to the top wall of the inner tank through the top wall of the outer shell, and the lower end of the inner joint pipe is communicated with the space in the inner tank; the stresses generated by the movement of the inner joint are transmitted to the upper end of the displacement compensator through the transition joint.

2. The cryogenic storage tank of claim 1, wherein the connection assembly further comprises a connection boss sleeved on an upper end of the inner pipe; the transition joint is connected with the displacement compensation part through the connecting shell ring.

3. The cryogenic storage tank of claim 2, wherein the connection assembly further comprises an outer tube sleeved over the waveguide; the transition joint is fixedly connected with the flange assembly through the external connecting pipe.

4. The cryogenic tank of claim 3, wherein the transition joint is an integrally formed structure; the transition joint includes:

the lower end of the outer pipe is fixedly connected with the connecting shell ring;

an inner tube located within the outer tube; the upper end of the inner pipe is fixedly connected with the outer connecting pipe, and the lower end of the inner pipe is fixedly connected with the inner connecting pipe;

a connection collar formed between the outer tube and the inner tube to fix the outer tube and the inner tube; the connecting ring sleeve is annular.

5. The cryogenic tank of claim 4, wherein an outer end of the connection collar has a first transition radius and an inner end of the connection collar has a second transition radius.

6. The cryogenic storage tank of claim 4, wherein the outer end of the connection collar is of a gradually thicker structure in a direction approaching the outer pipe; the inner end of the connecting ring sleeve is of a gradually thickened structure along the direction close to the inner pipe.

7. The cryogenic tank of claim 1, wherein the flange assembly comprises a first flange, a second flange below the first flange, and a third flange below the second flange;

the second flange is detachably connected with the first flange and fixedly connected with the upper end of the waveguide tube; the third flange is connected with the second flange in a sealing manner and is fixedly connected with the upper end of the transition joint;

the radar level gauge further comprises a radar detection part fixed on the top surface of the first flange.

8. The cryogenic tank of claim 1, further comprising a securing assembly for securing the waveguide; the fixing component is fixed in the inner tank.

9. The cryogenic storage tank of claim 8, wherein the fixing assembly comprises a support rod located in the inner tank, and a plurality of pipe clamps spaced on the support rod;

two ends of the supporting rod are respectively connected and fixed with the top wall and the bottom wall of the inner tank; and each pipe clamp is fixedly connected with the waveguide pipe.

10. The cryogenic tank of claim 1, further comprising a fitting assembly secured to the inner tank and the outer shell; the joint assembly includes:

the inner tank joint is arranged on the top wall of the inner tank in a penetrating way and is fixedly connected with the lower end of the inner connecting pipe; the inner tank joint is used for the waveguide tube to penetrate through;

the outer tank joint is arranged on the top wall of the shell in a penetrating way; the outer tank joint is penetrated by the inner connecting pipe; the outer tank joint is fixedly connected with the lower end of the displacement compensation piece.