CN212107835U - Double-deck spherical tank is with takeover connection structure and double-deck spherical tank - Google Patents

Abstract

The utility model discloses a double-deck spherical tank is with takeover connection structure and double-deck spherical tank relates to low temperature storage facilities technical field. The connecting pipe connecting structure comprises an inner tank body, an outer tank body, a liquid inlet pipe, a liquid outlet pipe and a flexible connecting piece. One end of the liquid inlet and outlet pipe is communicated with the inner tank body, and the other end of the liquid inlet and outlet pipe extends out of the avoidance hole on the outer tank body. The flexible connecting piece is arranged between the liquid inlet and outlet pipe and the avoidance hole, and the inner wall surface and the outer wall surface of the flexible connecting piece are respectively and fixedly connected with the outer pipe wall of the liquid inlet and outlet pipe and the inner hole wall of the avoidance hole. The flexible connecting piece comprises a plurality of sleeves which are sleeved outside the liquid inlet and outlet pipe and are sequentially arranged from inside to outside at intervals, the plurality of sleeves are connected to form a connecting structure with a square-wave-shaped cross section along the axial direction of the liquid inlet and outlet pipe, and a displacement compensation section is further arranged on at least one sleeve. Through the structure, the heat conduction quantity at the joint of the liquid inlet and outlet pipe and the outer tank body can be effectively reduced, the displacement change at the joint can be compensated, and the structure is simple and reliable.

Description

Double-deck spherical tank is with takeover connection structure and double-deck spherical tank

Technical Field

The utility model relates to a low temperature storage facilities technical field especially relates to a double-deck spherical tank is with takeover connection structure and double-deck spherical tank.

Background

The cryogenic medium is liquefied gas with boiling point lower than-20 deg.C, such as liquefied ethylene, liquefied natural gas, liquid oxygen, liquid argon, liquid nitrogen, liquid hydrogen, etc. The cryogenic medium is generally liquefied from a normal temperature gas for storage and transportation. In view of the characteristics of the cryogenic medium, the storage device thereof is required to have good thermal insulation properties. The double-layer spherical tank is used as a low-temperature storage device and is widely applied to storage of low-temperature liquefied gas media. Because the double-layer spherical tank can be stored under pressure, a low-temperature pump is not needed, and the investment cost and the operation cost are favorably reduced.

When the liquid inlet and outlet pipe of the double-layer spherical tank is led out from the inner tank body, the liquid inlet and outlet pipe needs to penetrate through the tank wall of the outer tank body and is connected with an external pipeline. When the liquid inlet and outlet pipe is connected with the outer tank body, the structure of the connecting part at least meets the following requirements: firstly, reduce the connection position heat conduction, secondly need compensate the displacement change that the difference in temperature arouses. Currently, to achieve this, vacuum tube connection structures are often used. However, the connection structure has high requirements for vacuum pumping, and once a failure occurs, the function of the connection structure is disabled, so that the reliability is low, and since the connection structure is complex, when the connection structure fails, all related structures including the liquid inlet and outlet pipe need to be integrally replaced, which undoubtedly increases economic cost and time cost greatly.

Accordingly, there is a need for a connection pipe connection structure for a double-layer spherical tank and a double-layer spherical tank to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a double-deck spherical tank is with taking over connection structure and double-deck spherical tank can effectively reduce the heat conduction between liquid business turn over pipe and the outer jar of body to the displacement at compensation liquid business turn over pipe and outer jar body coupling position changes, simple structure and reliable.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a double-deck spherical tank is with takeover connection structure, includes the inner tank body and the outer jar of body, still includes:

one end of the liquid inlet and outlet pipe is communicated with the inner tank body, and the other end of the liquid inlet and outlet pipe extends out of the avoidance hole in the outer tank body;

flexible connection spare sets up the liquid business turn over pipe with between the hole of dodging, flexible connection spare's internal face and outer wall respectively with the outer pipe wall of liquid business turn over pipe with dodge the interior pore wall fixed connection in hole, flexible connection spare includes that a plurality of covers establish the outside sleeve pipe of liquid business turn over pipe, it is a plurality of the sleeve pipe certainly the liquid business turn over pipe sets up and interconnect from inside to outside in proper order and forms the edge the axial of liquid business turn over pipe has the connection structure of square waveform cross-section, and at least one still be provided with the displacement compensation section on the sleeve pipe.

Optionally, the flexible connector is provided as a thin-walled structure.

Optionally, the displacement compensation section is disposed between the inner tank and the outer tank.

Optionally, the displacement compensation section is a bellows.

Optionally, the sleeves, the flexible connecting piece and the liquid inlet and outlet pipe, and the flexible connecting piece and the outer tank body are all welded together.

Optionally, a first heat-insulating layer is arranged outside the flexible connector.

Optionally, the flexible connection member includes a first annular plate, a first sleeve, a second annular plate, a second sleeve, a third annular plate and a third sleeve, which are sequentially arranged from inside to outside and connected to each other.

The utility model also provides a double-deck spherical tank, include as above double-deck spherical tank with taking over connection structure.

Optionally, the outer surface of the inner tank body and the inner surface of the outer tank body are respectively coated with a second insulating layer and a third insulating layer.

Optionally, the second insulating layer comprises a vacuum insulating layer and a first PIR insulating layer which are sequentially arranged from inside to outside from the outer surface of the inner tank body; and/or

The third insulation layer includes a second PIR insulation layer.

The utility model has the advantages that:

the utility model provides a double-deck spherical tank is with takeover connection structure and double-deck spherical tank. In this double-deck spherical tank is with taking over connection structure, through setting up the flexonics spare that is used for connecting liquid business turn over pipe and the outer jar of body to set up a plurality of sleeves in this flexonics spare, make a plurality of sleeves connect gradually and form the axial along liquid business turn over pipe and have the connection structure of square wave form cross-section, can greatly prolong the heat transfer length between liquid business turn over pipe and the outer jar of body, effectively reduce the heat conduction between liquid business turn over pipe and the outer jar of body. Meanwhile, the displacement compensation section is arranged in at least one sleeve, so that the displacement change of the connecting part of the liquid inlet and outlet pipe and the outer tank body can be compensated. The connecting structure is simple in arrangement, does not depend on a vacuumizing means, and is high in reliability.

Drawings

Fig. 1 is a schematic structural diagram of a connection pipe connection structure for a double-layer spherical tank according to an embodiment of the present invention;

fig. 2 is a schematic view of the overall structure of a double-layer spherical tank provided by the embodiment of the present invention.

In the figure:

1. an inner tank body; 2. an outer tank body; 3. a liquid inlet pipe and a liquid outlet pipe; 4. a flexible connector; 41. a first ring plate; 42. a first sleeve; 43. a second ring plate; 44. a second sleeve; 45. a displacement compensation section; 46. a third ring plate; 47. a third sleeve; 5. a reinforcing ring; 6. a first insulating layer; 7. a second insulating layer; 71. a vacuum heat insulating layer; 72. a first PIR thermal insulation layer; 8. a third insulating layer; 9. a pillar; 91. an upper support column; 92. a middle strut; 93. a lower strut; 10. a pull rod.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

This embodiment provides a double-deck spherical tank is with takeover connection structure. As shown in figure 1, the connecting pipe connecting structure for the double-layer spherical tank comprises an inner tank body 1, an outer tank body 2, a liquid inlet and outlet pipe 3 and a flexible connecting piece 4. Specifically, one end of the liquid inlet and outlet pipe 3 is communicated with the inner tank body 1, and the other end of the liquid inlet and outlet pipe extends out of the avoiding hole arranged on the outer tank body 2. The flexible connecting piece 4 is arranged between the liquid inlet and outlet pipe 3 and the avoiding hole, and the inner wall surface and the outer wall surface of the flexible connecting piece 4 are respectively and fixedly connected with the outer pipe wall of the liquid inlet and outlet pipe 3 and the inner hole wall of the avoiding hole. The flexible connecting piece 4 comprises a plurality of sleeves which are sleeved outside the liquid inlet and outlet pipe 3, the plurality of sleeves are sequentially arranged from the liquid inlet and outlet pipe 3 from inside to outside at intervals and are connected with each other to form a connecting structure with a square waveform section along the axial direction of the liquid inlet and outlet pipe 3, so that the heat transfer length between the liquid inlet and outlet pipe 3 and the outer tank body 2 can be greatly prolonged, and the heat conduction quantity between the liquid inlet and outlet pipe 3 and the outer tank body 2 is effectively reduced. Meanwhile, as the displacement compensation section 45 is also arranged on at least one sleeve, the displacement change of the connecting part of the liquid inlet and outlet pipe 3 and the outer tank body 2 can be compensated. Therefore, the connecting pipe connecting structure for the double-layer spherical tank is simple in overall arrangement, does not depend on a vacuumizing means, and is high in reliability. In this embodiment, the liquid inlet and outlet pipes 3 extend out of the avoiding holes on the outer tank 2 and then are connected with an external process pipeline.

Specifically, as can be seen from the heat conductivity formula Q of the solid material, the heat conductivity Q is proportional to the average heat conductivity λ of the material, the heat transfer area a, and the temperature difference Δ T between the two ends of the member, and inversely proportional to the heat transfer length L of the member, and in this embodiment, as shown in fig. 1, on a plane parallel to the axial direction of the liquid inlet and outlet pipe 3, the length of the flexible connecting member 4 along the heat transfer path between the outer tank 2 and the liquid inlet and outlet pipe 3 represents the heat transfer length L between the liquid inlet and outlet pipe 3 and the outer tank 2, so that the heat conductivity between the liquid inlet and outlet pipe 3 and the outer tank 2 can be effectively reduced by increasing the length of the flexible connecting member 4 along the heat transfer path without changing other parameters.

Further, the flexible connecting element 4 may be provided as a thin-walled structure. According to the arrangement, the wall thickness of the flexible connecting piece 4 is far smaller than the length of the flexible connecting piece, so that the cross section area (namely the heat transfer area A) of the flexible connecting piece 4 is reduced, and the heat conduction quantity between the liquid inlet and outlet pipe 3 and the outer tank body 2 is further effectively reduced.

Optionally, as shown in fig. 1, the displacement compensation section 45 is disposed between the inner tank 1 and the outer tank 2, so as to shield the displacement compensation section 45 by using the outer tank 2, thereby preventing the displacement compensation section 45 from being accidentally damaged due to exposure to the open air environment, and further improving the reliability of the whole structure.

As shown in fig. 1, in this embodiment, the flexible connecting member 4 includes, as a specific structure, a first sleeve 42, a second sleeve 44, and a third sleeve 47 that are sequentially provided from the liquid inlet/outlet pipe 3 at intervals from inside to outside. The displacement compensation section 45 is arranged in the middle of the second sleeve 44. In this embodiment, the displacement compensation section 45 is a bellows. The bellows is formed by machining a stainless steel sheet, and both ends of the bellows are fixedly connected to two straight tube sections, respectively, to form a second sleeve 44. The axial displacement and the radial displacement of the connecting part of the liquid inlet and outlet pipe 3 and the outer tank body 2 caused by temperature difference can be simultaneously compensated through the section of corrugated pipe in the second sleeve 44. When the corrugated pipe is used, the axial displacement and the radial displacement which need to be compensated can be calculated according to the practical application condition of the double-layer spherical tank, and then the corrugated pipe is designed according to the displacement which needs to be compensated so as to meet the requirement of displacement compensation.

Further, since the sleeves constituting the flexible connecting member 4 are all straight pipes, a plurality of ring plates are further disposed in the flexible connecting member 4 to achieve sealing connection between two adjacent sleeves and between the sleeves and the liquid inlet and outlet pipes 3. Specifically, as shown in fig. 1, a first ring plate 41 is provided in the flexible connecting member 4 to connect the outer wall of the liquid inlet and outlet pipe 3 with a first sleeve 42, a second ring plate 43 is provided to connect the first sleeve 42 with a second sleeve 44, and a third ring plate 46 is provided to connect the second sleeve 44 with a third sleeve 47. It is understood that, in order to reduce the heat transfer area of the flexible connecting member 4, the sleeve, the ring plate and the corrugated tube in this embodiment are made of thin plates.

Optionally, the sleeves, the flexible connecting piece 4 and the liquid inlet and outlet pipe 3 and the flexible connecting piece 4 and the outer tank body 2 are welded together to ensure the structural strength. More specifically, the parts to be welded are located between the ring plate and the liquid inlet and outlet pipe 3, between the sleeve and the ring plate, between the straight pipe section in the sleeve 44 and the displacement compensation section 44, and between the sleeve and the outer tank 2. In the manufacturing process, nondestructive detection and leakage detection are carried out on the welding seam part to ensure the air tightness of the structure. In addition, as shown in fig. 1, a reinforcing ring 5 is further disposed at a connection portion of the third sleeve 47 and the outer tank 2 to further enhance the structural strength of the avoidance hole portion.

Of course, it should be noted that, for any part and the connection part between parts in the connection pipe connection structure for the double-layer spherical tank, the design should be accurately performed before welding according to parameters such as the design pressure, the geometric dimension, the pipeline specification and the like of the double-layer spherical tank, so as to ensure that the strength and the sealing performance of the whole structure meet the theoretical requirements.

Optionally, a first heat insulation layer 6 is further provided outside the flexible connecting member 4. The first heat preservation layer 6 is made of heat insulation materials, and heat leakage quantity at the position of the flexible connecting piece 4 can be effectively reduced. Since the temperature difference is larger at the position closer to the liquid inlet/outlet pipe 3, as shown in fig. 1, the heat insulating material is coated outside the liquid inlet/outlet pipe 3, the first annular plate 41, and the first sleeve 42 in this embodiment. Of course, in other embodiments, the flexible connecting member 4 may be covered with a heat insulating material at other positions to achieve complete covering of the flexible connecting member 4, thereby minimizing heat leakage at the flexible connecting member 4.

In summary, in the connection pipe connection structure for the double-layer spherical tank provided in this embodiment, the flexible connection member 4 for connecting the liquid inlet and outlet pipe 3 and the outer tank body 2 is provided, and the plurality of sleeves are provided in the flexible connection member 4, so that the plurality of sleeves are sequentially connected to form a connection structure having a square-wave-shaped cross section along the axial direction of the liquid inlet and outlet pipe 3, the heat transfer length can be greatly extended, and the heat conduction amount between the liquid inlet and outlet pipe 3 and the outer tank body 2 is effectively reduced. Meanwhile, as the displacement compensation section 45 is arranged in at least one sleeve, the displacement change of the connecting part of the liquid inlet and outlet pipe 3 and the outer tank body 2 can be compensated. The flexible connecting piece 4 can be arranged into a thin-wall structure so as to reduce the heat transfer area and further reduce the heat conduction quantity between the liquid inlet and outlet pipe 3 and the outer tank body 2.

As shown in fig. 2, the present embodiment further provides a double-layer spherical tank, which includes the above-mentioned connecting pipe connection structure for a double-layer spherical tank.

Optionally, the inner tank 1 is a steel spherical tank, and an orange segment type or mixed spherical shell structure is adopted. A plurality of struts 9 are evenly distributed along the equator of the inner tank body 1 to support the inner tank body 1. The inner tank 1 is made of low temperature resistant steel (including but not limited to austenitic stainless steel and nickel steel) that can withstand low temperatures.

The same as the inner tank 1, the outer tank 2 is also a steel spherical tank, and adopts an orange segment type or a mixed spherical shell structure, and the spherical centers of the outer tank 2 and the inner tank 1 are superposed. Meanwhile, the outer tank body 2 is fixedly connected with the support 9. It should be noted that, when designing the size and structure of the outer tank 2, the load action of the structures such as wind load, snow load, earthquake load, and attached ladder platform on the outer tank 2 needs to be considered.

Optionally, considering the processing capacity, transportation conditions, etc. comprehensively, when the tank body is manufactured, a large-sized flap structure should be adopted as much as possible to reduce the overall length of the welding seam and reduce the field installation work.

Further, considering that the upper end of the support 9 is fixedly connected with the inner tank 1, the lower end of the support passes through the outer tank 2, and part of the structure is located between the inner tank 1 and the outer tank 2, as shown in fig. 2, the support 9 is provided with a sectional structure in this embodiment, so that the support 9 can play a supporting role and can meet the heat insulation requirement of the spherical tank. Specifically, the pillar 9 is divided into three parts, from top to bottom, an upper pillar 91, a middle pillar 92, and a lower pillar 93. Wherein the upper support 91 and the middle support 92 are both disposed between the inner tank 1 and the outer tank 2. The upper end of the upper pillar 91 is fixedly connected to the inner tank 1, and a heat insulating layer is provided on the outer surface of the upper pillar 91 to reduce heat leakage. The middle support 92 is arranged in a horizontal plane centripetal sliding structure to perform displacement compensation, and the damage of the support 9 caused by the contraction caused by the temperature difference between the inner tank body 1 and the outer tank body 2 is avoided. Alternatively, the middle strut 92 is made of a pressure-bearing insulating material (including, but not limited to, fiberglass). The lower support 93 is fixedly connected to the outer tank 2 and disposed to penetrate the outer tank 2, and the lower end of the lower support 93 is fixed to a foundation. The lower support 93 may be made of a material having a property close to that of the outer vessel 2, for ease of manufacture. In this embodiment, the pillars 9 are made of finished steel pipes or steel plate-rolled pipes.

Further, as shown in fig. 2, a pull rod 10 is disposed between two adjacent pillars 9 to increase the stability of the whole structure. In this embodiment, each tie rod 10 is configured as an adjustable structure. The tightness of the pull rod 10 can be adjusted according to actual conditions in the using process so as to improve the stress condition of the pull rod 10 and ensure the safety and stability of the double-layer spherical tank in the operation process. Specifically, the draw bar 10 is divided into two sections, long and short. Wherein, the upper portion of pull rod 10 is long section, and the lower part of pull rod 10 is short section, connects through adjustable nut (the setting of adjustable nut position should be convenient for operate) between long section and the short section to adjust the elasticity of pull rod 10 through adjustable nut.

In this embodiment, in order to ensure the heat insulation performance of the double-layer spherical tank, a sandwich structure between the inner tank body 1 and the outer tank body 2 is also provided.

Optionally, as shown in fig. 2, the outer surface of the inner tank body 1 and the inner surface of the outer tank body 2 are coated with a second insulating layer 7 and a third insulating layer 8, respectively, to improve the heat insulating performance of the double-layer spherical tank. And a vacuum layer is arranged between the second heat-insulating layer 7 and the third heat-insulating layer 8, namely, the second heat-insulating layer 7 and the third heat-insulating layer 8 are vacuumized, so that the heat-insulating property is further improved. Of course, the arrangement of the vacuum layer is also beneficial to reducing the total weight of the double-layer spherical tank.

In this embodiment, the total width of the interlayer between the inner tank 1 and the outer tank 2 is 0.6m to 1.2 m. Of course, in other embodiments, other configurations or sizes of the spherical tank insert may be provided. However, it should be noted that the sandwich structure of the double-layer spherical tank should be designed reasonably all the time according to the characteristics of the storage medium in the tank, such as boiling point, and the like, and the requirement of thermal insulation performance, and the resource waste caused by over-design is avoided.

Optionally, the second insulating layer 7 comprises a vacuum insulation layer 71 and a first PIR insulation layer 72 which are arranged in sequence from the inside to the outside of the outer surface of the inner tank 1. The Vacuum Insulation layer 71 is made of Vacuum Insulation Panel (VIP), and the Vacuum Insulation Panel and the PIR (Polyisocyanurate Foam) are prefabricated into a spherical shell-shaped small block for installation. Further, the space between the outer surface of the inner tank 1 and the inner surface of the vacuum heat insulating layer 71 and the space between the outer surface of the vacuum heat insulating layer 71 and the inner surface of the first PIR heat insulating layer 72 are both adhered by low temperature resistant adhesives. Meanwhile, a fixing structure made of low-temperature resistant elastic materials is bound on the outer surface of the first PIR heat insulating layer 72 to prevent the second heat insulating layer 7 from falling off, and the reliability of the structure is further enhanced. The heat transfer caused by gas convection and heat conduction can be effectively eliminated through the composite heat insulation structure, the heat insulation effect of the double-layer spherical tank is greatly improved, the loss of low-temperature media is reduced, and the investment and maintenance cost of equipment is reduced.

In addition, the thermal conductivity of the vacuum insulation panel is only about one tenth of that of the expanded perlite, so that the use amount of the insulation material can be greatly reduced by arranging the vacuum insulation layer 71 when the same insulation effect is ensured, the total weight of the equipment is effectively reduced, and the safe operation of the equipment is more facilitated.

Optionally, the third insulating layer 8 coated on the inner surface of the outer tank 2 comprises a second PIR insulating layer. However, unlike the first PIR insulation layer 72, the third insulation layer 8 is applied by spraying or pasting on site, i.e. the PIR is uniformly coated on the inner surface of the outer tank 2 by spraying or pasting. Can guarantee through third heat preservation 8 that equipment has the ability of coping with complex environmental condition, effectively reduce external environment (such as solar radiation, conflagration etc.) to the adiabatic influence of double-deck spherical tank, make double-deck spherical tank have lower evaporation capacity.

In short, the double-layer spherical tank provided by the embodiment has the advantages of reliable structure, good heat insulation performance, stable operation and wide applicable storage medium range, can be used for storing various low-temperature media such as liquefied ethylene, liquefied natural gas, liquid oxygen, liquid argon, liquid nitrogen, liquid hydrogen and the like, and has extremely high economical efficiency, practicability and safety.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (10)

1. The utility model provides a double-deck spherical tank is with takeover connection structure, includes the inner tank body (1) and the outer jar body (2), its characterized in that still includes:

one end of the liquid inlet and outlet pipe (3) is communicated with the inner tank body (1), and the other end of the liquid inlet and outlet pipe (3) extends out of the avoidance hole on the outer tank body (2);

flexible connection spare (4), set up liquid business turn over pipe (3) with between the dodge hole, the internal face and the outer wall of flexible connection spare (4) respectively with the outer pipe wall of liquid business turn over pipe (3) with dodge the interior pore wall fixed connection in hole, flexible connection spare (4) include that a plurality of covers establish the outer sleeve pipe of liquid business turn over pipe (3), it is a plurality of the sleeve pipe certainly liquid business turn over pipe (3) are from inside to outside interval setting and interconnect in proper order and are formed the edge the axial of liquid business turn over pipe (3) has the connection structure of square wave form cross-section, and at least one still be provided with displacement compensation section (45) on the sleeve pipe.

2. The connection pipe connection structure for a double-layered spherical tank according to claim 1, wherein the flexible connection member (4) is provided in a thin-walled structure.

3. The joint pipe connection structure for a double-layered spherical tank according to claim 1, wherein the displacement compensation section (45) is provided between the inner tank (1) and the outer tank (2).

4. The joint connection structure for a double-layered spherical tank according to claim 3, wherein the displacement compensation section (45) is a bellows.

5. The connection pipe connection structure for the double-layer spherical tank according to claim 1, wherein a plurality of sleeves, the flexible connecting piece (4) and the liquid inlet and outlet pipe (3), and the flexible connecting piece (4) and the outer tank body (2) are connected by welding.

6. The connection pipe connection structure for the double-layer spherical tank according to claim 1, wherein a first heat-insulating layer (6) is arranged outside the flexible connection member (4).

7. The connection pipe connection structure for the double-layer spherical tank according to claim 1, wherein the flexible connection member (4) comprises a first annular plate (41), a first sleeve (42), a second annular plate (43), a second sleeve (44), a third annular plate (46) and a third sleeve (47) which are sequentially arranged from inside to outside from the liquid inlet and outlet pipe (3) and are connected with each other.

8. A double-layered spherical tank comprising the joint connection structure for a double-layered spherical tank according to any one of claims 1 to 7.

9. The double-layer spherical tank according to claim 8, wherein the outer surface of the inner tank body (1) and the inner surface of the outer tank body (2) are coated with a second insulating layer (7) and a third insulating layer (8), respectively.

10. The double-layer spherical tank according to claim 9, wherein the second insulating layer (7) comprises a vacuum insulating layer (71) and a first PIR insulating layer (72) which are sequentially arranged from the outer surface of the inner tank body (1) from inside to outside; and/or

The third insulating layer (8) comprises a second PIR insulating layer.

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