Low-temperature storage tank liquid level meter liquid phase pipeline heating device and low-temperature storage tank assembly

Abstract

The utility model belongs to the field of low-temperature storage tanks, and discloses a low-temperature storage tank liquid level meter liquid phase pipeline heating device and a low-temperature storage tank assembly, and the low-temperature storage tank liquid level meter liquid phase pipeline heating device comprises a heating pipe and a wall penetrating connector. The middle pipe section of the heating pipe is arranged between an inner tank and an outer tank of the storage tank and abuts against the pipe section, close to the inner tank, of a liquid phase pipe of a liquid level meter side by side, the two ends of the heating pipe extend out of the outer tank, and a heating medium is introduced into the heating pipe; the wall-penetrating joint penetrates through the outer tank, the outer wall of the wall-penetrating joint is connected with the outer tank in a sealed mode, a through hole is formed in the wall-penetrating joint, the heating pipe penetrates through the through hole, and the heating pipe is connected with the wall-penetrating joint in a sealed mode. According to the utility model, the purpose of preventing ice blockage can be achieved; in addition, after ice blockage occurs, the ice blockage fault can be eliminated under the condition that low-temperature liquid does not need to be emptied.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature storage tank technical field especially a kind of low temperature storage tank liquid level meter liquid phase pipeline heating device and low temperature storage tank assembly. BACKGROUND

[0002] The low temperature container is a high-vacuum multilayer adiabatic low temperature pressure container, which is used for long-term and safe storage of liquid oxygen, liquid hydrogen, liquid nitrogen and other media. The low temperature liquefied gas (such as liquid oxygen, liquid hydrogen, liquid nitrogen, etc.) usually has high risk, and can cause frostbite (cold burn) when contacting with human skin and eyes. When vaporized into gas, the volume will expand rapidly, which can easily cause overpressure danger in airtight container. In addition, some liquefied gases also have the characteristics of flammability, explosiveness and toxicity. Since the low temperature liquefied gas has high risk, the liquid level meter, as an essential measuring element and safety accessory, is the guarantee for normal and safe operation of the low temperature container.

[0003] At present, there are various methods for measuring the liquid level of low temperature liquid, and the differential pressure method is the most commonly used method for measuring the liquid level of low temperature liquid in the storage tank. The low temperature liquefied gas storage tank includes an inner tank and an outer tank. The differential pressure method is to lead out a liquid phase pipe and a gas phase pipe from the bottom and the top of the low temperature liquefied gas storage tank respectively. The pressure in the liquid phase pipe represents the bottom pressure of the low temperature liquefied gas storage tank, and the pressure in the gas phase pipe represents the top pressure of the low temperature liquefied gas storage tank. The pressure difference between the gas phase pipe and the liquid phase pipe (which is the static pressure generated by the liquid column in the storage tank) is measured by the liquid level meter, so as to determine the height of the liquid column (liquid level) and the capacity in the storage tank, which can be displayed on site. In addition, the pressure difference generated by the liquid level can also be transmitted to the control room for display through the differential pressure transmitter, and participate in the control interlocking of the storage tank.

[0004] However, since the pipe diameter of the liquid level meter liquid phase pipe is small, ice blocking occurs easily during use, which blocks the pipeline. This is mainly because the low temperature liquid inevitably contains a certain amount of water and hydrocarbons. These compounds will solidify or crystallize under certain temperature and pressure conditions, and accumulate for a certain period of time to block the pipeline. If the pipeline contains metal shavings and other impurities, the impurities will also accelerate the solidification or crystallization of the compounds. Once ice blocking occurs in the liquid phase pipe, the liquid level of the storage tank cannot be accurately obtained, and it is quite dangerous to store and use liquefied gas under this condition. The usual method is to empty the liquefied gas in the tank, and then use hot gas to blow the liquid phase pipe to melt the "ice". When there is a large amount of liquid in the tank, emptying will cause a lot of waste, and the site environment may not have the condition for discharge. In addition, this method cannot prevent the occurrence of ice blocking in advance, which seriously affects the normal use of the low temperature container. SUMMARY

[0005] The application aims to provide a low-temperature storage tank liquid level gauge liquid phase pipeline heating device and a low-temperature storage tank assembly, which can not only prevent ice blockage, but also remove the ice blockage without emptying the low-temperature liquid after the ice blockage occurs.

[0006] The technical scheme provided by the application is as follows:

[0007] In one aspect, the application provides a low-temperature storage tank liquid level gauge liquid phase pipeline heating device, the storage tank comprising an inner tank and an outer tank, the liquid level gauge comprising a liquid phase pipe, the low-temperature storage tank liquid level gauge liquid phase pipeline heating device comprising:

[0008] a heating pipe, a middle pipe section of the heating pipe being arranged between the inner tank and the outer tank and abuttingly arranged in parallel with a pipe section of the liquid phase pipe close to the inner tank, two ends of the heating pipe extending out of the outer tank, and the heating pipe being used for passing a heating medium;

[0009] a through-wall connector, the through-wall connector being arranged through the outer tank, an outer wall of the through-wall connector being sealingly connected with the outer tank, a through hole being arranged in the through-wall connector, the heating pipe passing through the through hole, and the heating pipe being sealingly connected with the through-wall connector.

[0010] In some embodiments, a wall thickness of the through-wall connector at a connection position with the outer tank is substantially the same as a wall thickness of the outer tank;

[0011] a wall thickness of the through-wall connector at a connection position with the heating pipe is substantially the same as a wall thickness of the heating pipe.

[0012] In some embodiments, the through-wall connector comprises a first connecting section, a second connecting section and a third connecting section connected in sequence, an outer diameter of the first connecting section being smaller than an outer diameter of the third connecting section, a sealing part being arranged at an end of the first connecting section away from the second connecting section, the heating pipe passing through the sealing part and being sealingly welded with the sealing part, and the third connecting section being sealingly welded with the outer tank.

[0013] In some embodiments, a wall thickness of the third connecting section along a radial direction of the heating pipe is substantially the same as a wall thickness of the outer tank along an axial direction of the heating pipe;

[0014] a thickness of the sealing part along an axial direction of the heating pipe is substantially the same as a wall thickness of the heating pipe along a radial direction.

[0015] In some embodiments, a pipe clamp is further arranged, the pipe clamp being fixedly arranged on the outer tank or an inner wall and being arranged corresponding to the through-wall connector, and the heating pipe sequentially passes through the pipe clamp and the through-wall connector.

[0016] In some embodiments, the pipe clamp comprises a fixing plate, a heat insulation plate and a support connected in sequence, the support is used for fixedly connecting with the inner wall of the outer tank, the fixing plate is provided with a first through hole, the heat insulation plate is provided with a second through hole, the second through hole is coaxially arranged with the first through hole, and the aperture of the second through hole is smaller than that of the first through hole, and the heating pipe passes through the second through hole and the first through hole.

[0017] In some embodiments, a clamp is further included, the clamp is used for fixing the heating pipe and the liquid phase pipe, and the heating pipe and the liquid phase pipe are kept in abutment.

[0018] In some embodiments, a vacuum angle valve and a vacuum flange are further included.

[0019] The vacuum angle valve is arranged at the inlet of the heating pipe.

[0020] The vacuum flange is arranged at the outlet of the heating pipe.

[0021] In another aspect, a low-temperature tank assembly is further provided, comprising a tank, a liquid level meter and the low-temperature tank liquid level meter liquid phase pipe heating device of any one of the above embodiments.

[0022] In some embodiments, one end of the liquid phase pipe passes through the outer tank and is sealingly connected with the outer tank through the wall-penetrating connector.

[0023] The technical effect of the present application is that: by arranging the heating pipe and the liquid phase pipe side by side, the liquid phase pipe can be periodically heated by the heating pipe to prevent ice blockage, and after ice blockage occurs, the heating pipe can be used to heat the liquid phase pipe to remove the ice blockage without emptying the low-temperature liquid, thereby saving a lot of manpower, material resources and time cost; in addition, the present application adopts a direct contact heat exchange mode, which has the advantages of high heat exchange efficiency and fast fault handling compared with other heat exchange modes; the heating pipe and the liquid phase pipe are arranged side by side, and the process is simpler; the heating pipe is sealingly connected with the outer tank through the wall-penetrating connector, which can ensure the vacuum degree of the tank interlayer and has good sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0025] Figure 1 is a structure schematic view of a low-temperature tank assembly provided by the specific embodiments of the present application;

[0026] Figure 2 is a structure schematic view of a low-temperature tank liquid level meter liquid phase pipe heating device provided by the specific embodiments of the present application;

[0027] Figure 3is a local structure schematic diagram of a low-temperature storage tank liquid level meter liquid phase pipeline heating device provided by an embodiment of the present application;

[0028] Figure 4 is a cross-sectional view of a wall penetrating joint and an outer tank provided by an embodiment of the present application.

[0029] Explanation of reference signs:

[0030] 10, liquid phase pipe; 20, inner tank; 30, outer tank;

[0031] 100, heating pipe; 200, wall penetrating joint; 210, first connecting section; 220, second connecting section; 230, third connecting section; 240, sealing part; 300, protective sleeve; 400, pipe clamp; 410, fixed plate; 420, heat insulation plate; 430, support; 500, clamp; 600, vacuum angle valve; 700, vacuum flange. DETAILED DESCRIPTION

[0032] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons having ordinary skill in the art will appreciate that embodiments of the application can be practiced without the specific details, and that the scope of the application is not limited to the particular embodiments described herein. In other instances, details of well-known systems, structures, circuits, and methods have been omitted in order to not obscure the understanding of the present application.

[0033] In order to more clearly illustrate the technical solutions of the application or prior art, the specific embodiments of the application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort, and other embodiments can also be obtained.

[0034] In order to make the drawing simple, only the parts related to the application are shown in each drawing, and they do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term "and / or" used in the specification and claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0036] In this document, unless otherwise indicated and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] In the embodiments shown in the drawings, the indications of directions, such as up, down, left, right, front, and back, etc., are not absolute but relative when describing the structure and movement of various components, and are not used to limit the direction of actual use of the product.

[0038] In addition, in the description of the present application, ordinal numbers, such as "first", "second", etc., are only used to distinguish the description of the associated objects, and cannot be understood as indicating or implying the relative importance or order between the associated objects.

[0039] According to the specific embodiments provided by the present application, as shown in Figures 1 to 3 A low-temperature storage tank liquid level meter liquid phase pipeline heating device, including a heating pipe 100 and a through-wall connector 200, the heating pipe 100 is used to pass into a high-temperature medium, such as hot water, hot air or hot nitrogen, etc., the high-temperature medium passed into the heating pipe 100 is used to locally heat the part of the liquid phase pipe 10 close to the storage tank, and the heating pipe 100 abuts against the liquid phase pipe 10, and the two heat exchanges by the mode of mainly conduction and auxiliary radiation, so as to melt the "ice" in the liquid phase pipe 10, and achieve the purpose of preventing ice blockage. The through-wall connector 200 is used to realize the sealed connection of the heating pipe 100 and the storage tank, so as to maintain the vacuum degree between the inner tank 20 and the outer tank 30 of the storage tank. The present embodiment can also provide a controllable heat source for the heating pipe 100 by setting a heat source and a control system, and can periodically heat the liquid phase pipe 10 of the liquid level meter according to the use of the storage tank, so as to achieve the purpose of preventing ice blockage after the medium in the storage tank is used up and before the new medium is filled; or the ice blockage can be removed by using the heating pipe 100 without emptying the low-temperature liquid after the ice blockage occurs. In the present embodiment, the heat source and the control system can provide a heat source for the liquid level meter pipeline ice blockage prevention device, and control the heating time and the heating temperature. The structure is simple and portable, and can be taken out during maintenance and stored in the base during non-maintenance, without occupying the space above. The pipeline ice blockage prevention device and the heat source and the control system are separated, which meets the space requirement.

[0040] Specifically, the storage tank includes an inner tank 20 and an outer tank 30, the inner tank 20 is arranged in the outer tank 30, and the space between the inner tank 20 and the outer tank 30 is kept vacuum to achieve vacuum insulation effect, reduce heat transfer, and thus keep the low temperature state of the low temperature medium in the inner tank 20. The liquid level meter includes a liquid phase pipe 10, the liquid phase pipe 10 is led out from the bottom of the inner tank 20, and the pressure in the liquid phase pipe 10 represents the bottom pressure of the inner tank 20.

[0041] The middle pipe segment of the heating pipe 100 is arranged between the inner tank 20 and the outer tank 30 of the storage tank and abuts against the pipe segment of the liquid phase pipe 10 close to the inner tank 20 in parallel, so as to locally heat the pipe segment of the liquid phase pipe 10 close to the inner tank 20, and achieve the purpose of removing or preventing ice blockage. The two ends of the heating pipe 100 are extended out of the outer tank 30 through a wall penetration joint 200, the outer wall of the wall penetration joint 200 is sealingly connected with the outer tank 30 by welding, the wall penetration joint 200 is provided with a through hole, the heating pipe 100 passes through the through hole, and the outer wall of the heating pipe 100 is sealingly connected with the wall penetration joint 200 by welding, so as to ensure the sealing performance of the vacuum interlayer of the storage tank. The heating pipe 100 of the embodiment allows welding splicing, and vacuum leak detection should be performed after splicing, and the leakage rate should be at least one order of magnitude better than the leakage rate of the interlayer of the low temperature storage tank.

[0042] The ice blockage prevention device of the embodiment has the following effects:

[0043] (1) The direct contact heat exchange mode is adopted, compared with other heat exchange modes, has the advantages of high heat exchange efficiency and fast fault handling, and the heating pipe and the liquid phase pipe are arranged in parallel, and the process is simpler.

[0044] (2) The two ends of the heating pipe are sealingly connected with the outer tank through the wall penetration joint, which can ensure the vacuum degree of the interlayer of the storage tank and has good sealing performance.

[0045] (3) The operation is simple, the liquefied gas does not need to be emptied, and the liquefied gas tank does not need to be rewarmed, which saves a lot of manpower, material resources and time cost.

[0046] (4) Compared with passive treatment, the device can also achieve the purpose of preventing ice blockage, thereby effectively improving the use safety and maintainability of the low temperature storage tank.

[0047] In some embodiments, the wall thickness of the connection between the wall penetration joint 200 and the outer tank 30 is substantially the same as the wall thickness of the outer tank 30, and the wall thickness of the connection between the wall penetration joint 200 and the heating pipe 100 is substantially the same as the wall thickness of the heating pipe 100, which can reduce welding deformation, avoid the thinner place being pulled during welding, and thus improve the welding quality and ensure the sealing performance of the vacuum interlayer of the low temperature storage tank. The substantially same wall thickness in the embodiment means that the wall thickness deviation between the two is within 10%.

[0048] Further, as Figure 4As shown, the wall-penetrating connector 200 comprises a first connecting section 210, a second connecting section 220 and a third connecting section 230 connected in sequence, the outer diameter of the first connecting section 210 is smaller than that of the third connecting section 230, the outer diameter of the second connecting section 220 is between the outer diameters of the first connecting section 210 and the third connecting section 230, the end of the first connecting section 210 away from the second connecting section 220 is provided with a sealing portion 240, the sealing portion 240 is provided with an opening communicating with the through hole, the inner diameter of the opening is smaller than that of the through hole, the heating pipe 100 passes through the opening of the sealing portion 240 and the outer wall of the heating pipe 100 is sealingly welded with the sealing portion 240, and the outer wall of the third connecting section 230 is sealingly welded with the outer tank 30.

[0049] The wall thickness a of the third connecting section 230 is the wall thickness at the connection between the wall-penetrating connector 200 and the outer tank 30, and the wall thickness a of the third connecting section 230 is the thickness of the third connecting section 230 along the radial direction of the heating pipe 100. The wall thickness b of the sealing portion 240 is the wall thickness at the connection between the wall-penetrating connector 200 and the heating pipe 100, and the wall thickness b of the sealing portion 240 is the thickness of the sealing portion 240 along the axial direction of the heating pipe 100. Therefore, the wall thickness of the third connecting section 230 along the radial direction of the heating pipe 100 is substantially the same as the wall thickness of the outer tank 30 along the axial direction of the heating pipe 100, and the thickness of the sealing portion 240 along the axial direction of the heating pipe 100 is substantially the same as the wall thickness of the heating pipe 100 along the radial direction, so as to reduce the deformation when the wall-penetrating connector 200 is welded with the outer tank 30 and reduce the deformation when the wall-penetrating connector 200 is welded with the heating pipe 100, improve the welding quality, and ensure the sealing of the vacuum sandwich of the low-temperature storage tank.

[0050] Further, as shown in Figure 2 and Figure 4 , the outer part of the wall-penetrating connector 200 is further provided with a protective sleeve 300, the protective sleeve 300 is sleeved on the wall-penetrating connector 200 and is fixedly connected with the outer tank 30 or the inner tank 20, so as to protect the wall-penetrating connector 200.

[0051] In some embodiments, as shown in Figure 1 and Figure 2 , a pipe clamp 400 is further included, the pipe clamp 400 is arranged on the inner wall of the outer tank 30 and is arranged correspondingly with the wall-penetrating connector 200, and the heating pipe 100 passes through the pipe clamp 400 and the wall-penetrating connector 200 in sequence. The pipe clamp 400 can be fixedly arranged on the inner wall of the outer tank 30 by welding, of course, the pipe clamp 400 can also be fixedly arranged on the outer wall of the inner tank 20. The heating pipe 100 passes through the pipe clamp 400, and the heating pipe 100 can be fixed on the outer tank 30 or the inner tank 20 by the pipe clamp 400, so as to play a role in resisting impact and improve the installation stability of the heating pipe 100.

[0052] As shown in Figure 2As shown, the pipe clamp 400 comprises a fixing plate 410, a heat insulation plate 420 and a bracket 430 connected in sequence, the bracket 430 is used for fixedly connecting with the inner wall of the outer tank 30, the fixing plate 410 is provided with a first through hole, the heat insulation plate 420 is provided with a second through hole, the second through hole is coaxially arranged with the first through hole, and the aperture of the second through hole is smaller than the aperture of the first through hole, and the heating pipe 100 passes through the second through hole and the first through hole. The aperture of the second through hole provided on the heat insulation plate 420 is smaller than the aperture of the first through hole on the fixing plate 410, when the heating pipe 100 passes through the first through hole and the second through hole of the pipe clamp 400, the heating pipe 100 will contact the side wall of the second through hole and will not contact the side wall of the first through hole, that is, when the heating pipe 100 passes through the pipe clamp 400, the heating pipe 100 will contact the heat insulation plate 420 and will not contact the fixing plate 410, the heat insulation plate 420 is made of heat insulation material, so as to play a heat insulation role, avoid the heat of the heating pipe 100 from being transmitted to the pipe clamp 400, and then being transmitted to the outer tank 30 or the inner tank 20, so as to maintain the low-temperature state of the storage tank. In the embodiment, the fixing plate 410 and the bracket 430 can be made of ordinary steel, and the heat insulation plate 420 can be made of glass steel, glass cotton, ceramic cotton and other materials having a heat insulation role.

[0053] In some embodiments, as shown in Figure 3 As shown, the ice block prevention and treatment device further comprises a clamp 500, the number of the clamp 500 is one or more, and the clamp 500 is used for fixing the heating pipe 100 and the liquid phase pipe 10, so that the heating pipe 100 and the liquid phase pipe 10 are kept in abutment. The heating pipe 100 and the liquid phase pipe 10 are fixed through the clamp 500, which not only can increase the heat conduction effect, but also can prevent the two pipes from being separated under the conditions of inclination, swing, impact and the like, so that the ice block prevention and treatment device has good environmental adaptability.

[0054] In some embodiments, as shown in Figure 2 As shown, the ice block prevention and treatment device further comprises a vacuum angle valve 600 and a vacuum flange 700; the vacuum angle valve 600 is arranged at the inlet of the heating pipe 100; and the vacuum flange 700 is arranged at the outlet of the heating pipe 100. The vacuum angle valve 600 is arranged at the inlet of the heating pipe 100, which is convenient for being connected with the base maintenance tool, i.e. a heat source and a control system, during ice block maintenance, has high reliability, good sealing performance and the like. The vacuum flange 700 is arranged at the outlet of the heating pipe 100, and the vacuum flange 700 can adopt a knife-edge sealing structure, which is opened during ice block maintenance and closed during non-maintenance, and has good sealing performance.

[0055] The application further provides an embodiment of a low-temperature storage tank assembly, as shown in Figures 1 to 4As shown, the low-temperature tank liquid level gauge liquid phase pipeline heating device is provided in the storage tank, the liquid level gauge and any of the above embodiments. The storage tank comprises an inner tank 20 and an outer tank 30, the liquid level gauge comprises a liquid phase tube 10, one end of the liquid phase tube 10 extends into the inner tank 20, the other end of the liquid phase tube 10 penetrates the outer tank 30, and the liquid phase tube 10 can also be connected to the inner tank 20 and the outer tank 30 through a wall penetrating joint 200 to ensure the sealing of the liquid phase tube 10 connected to the inner tank 20 and the outer tank 30.

[0056] By providing the ice blocking placement device in the low-temperature tank, the heating pipe 100 and the liquid phase tube 10 exchange heat in the mode of "conduction as the main and radiation as the auxiliary", so that the "ice" melts, and the heat exchange efficiency is high; by providing the base maintenance tool, the heat source and the control system, the controllable heat source is provided for the heating device. The liquid phase tube 10 of the liquid level gauge can be heated regularly before the medium in the low-temperature tank is used up and new medium is added according to the use condition of the storage tank, so that the purpose of preventing ice blocking is achieved, and the use safety and the maintainability of the low-temperature tank are effectively improved; after the ice blocking occurs, the ice blocking fault can be removed without emptying the low-temperature liquid, and the storage tank does not need to be re-warmed, so that a large amount of manpower, material resources and time cost are saved.

[0057] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0058] It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, which should be considered as the protection scope of the application.

Claims

1. A low temperature storage tank liquid level gauge liquid phase line heating device, the storage tank comprising an inner tank and an outer tank, the liquid level gauge comprising a liquid phase pipe, characterized in that, The low-temperature storage tank liquid level meter liquid phase pipeline heating device comprises: a heating pipe, a middle pipe section of the heating pipe is arranged between the inner tank and the outer tank and is arranged in abutment with a pipe section of the liquid phase pipe close to the inner tank, both ends of the heating pipe extend out of the outer tank, and the heating pipe is used for passing a heating medium; a through-wall joint, the through-wall joint is provided through the outer tank, an outer wall of the through-wall joint is in sealed connection with the outer tank, a through hole is arranged in the through-wall joint, the heating pipe passes through the through hole, and the heating pipe is in sealed connection with the through-wall joint.

2. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to claim 1, wherein a wall thickness of a connection part of the through-wall joint and the outer tank is substantially the same as a wall thickness of the outer tank; a wall thickness of a connection part of the through-wall joint and the heating pipe is substantially the same as a wall thickness of the heating pipe.

3. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to claim 2, wherein the through-wall joint comprises a first connecting section, a second connecting section and a third connecting section connected in sequence, an outer diameter of the first connecting section is smaller than an outer diameter of the third connecting section, a sealing part is arranged on an end of the first connecting section away from the second connecting section, the heating pipe passes through the sealing part and is sealed and welded with the sealing part, and the third connecting section is sealed and welded with the outer tank.

4. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to claim 3, wherein a wall thickness of the third connecting section along a radial direction of the heating pipe is substantially the same as a wall thickness of the outer tank along an axial direction of the heating pipe; a thickness of the sealing part along an axial direction of the heating pipe is substantially the same as a wall thickness of the heating pipe along a radial direction.

5. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to any one of claims 1-4, further comprising a pipe clamp, the pipe clamp is fixedly arranged on the outer tank or an inner wall and is arranged in correspondence with the through-wall joint, and the heating pipe passes through the pipe clamp and the through-wall joint in sequence.

6. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to claim 5, wherein the pipe clamp comprises a fixed plate, a heat insulation plate and a support connected in sequence, the support is used for fixedly connecting with an inner wall of the outer tank, a first through hole is arranged on the fixed plate, a second through hole is arranged on the heat insulation plate, the second through hole is coaxially arranged with the first through hole, a hole diameter of the second through hole is smaller than a hole diameter of the first through hole, and the heating pipe passes through the second through hole and the first through hole.

7. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to any one of claims 1-4, further comprising a clamp, the clamp is used for fixing the heating pipe and the liquid phase pipe, so that the heating pipe and the liquid phase pipe are kept in abutment.

8. The low-temperature storage tank liquid level meter liquid phase pipeline heating device according to any one of claims 1-4, further comprising a vacuum angle valve and a vacuum flange; the vacuum angle valve is arranged at an inlet of the heating pipe; the vacuum flange is arranged at an outlet of the heating pipe. ​ ​ ​ 9. A cryogenic storage tank assembly, characterized by, The low-temperature tank liquid level meter liquid-phase pipeline heating device comprises a tank, a liquid level meter and the low-temperature tank liquid level meter liquid-phase pipeline heating device in any one of claims 1-8.

10. A cryogenic storage tank assembly according to claim 9, wherein, One end of the liquid-phase pipeline penetrates through the outer tank and is sealingly connected with the outer tank through the wall-penetrating joint.

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