Double-layer low-temperature spherical tank and its support structure

Abstract

The present invention provides a double-layer cryogenic spherical tank and its support structure. The double-layer cryogenic spherical tank includes an inner spherical tank and an outer spherical tank covering the inner spherical tank. The support structure includes a bottom plate, as well as an internal support member and an external support member; the internal support member includes a heat insulation member, an upper support column connected to the upper end of the heat insulation member, and a lower support column connected to the lower end of the heat insulation member. The upper support column is connected to the equatorial plate of the inner spherical tank, and the lower support column is connected to the bottom plate. The heat insulation member includes an upper heat insulation plate, an upper connecting plate, an intermediate heat insulation plate, a lower connecting plate and a lower heat insulation plate arranged in sequence from top to bottom, as well as fasteners. The materials of the upper heat insulation plate, the intermediate heat insulation plate and the lower heat insulation plate are all fiberglass reinforced plastic. The upper connecting plate is connected to the upper support column, and the lower connecting plate is connected to the lower support column. The upper heat insulation plate is annular and the inner end of the upper heat insulation plate has a protruding portion protruding downward to isolate the fasteners from the upper connecting plate. The lower heat insulation plate is annular and the inner end of the lower heat insulation plate has a protruding portion protruding upward to isolate the fasteners from the lower connecting plate.

Description

Technical Field

[0001] The present invention relates to the technical field of double-layer spherical storage tanks, and particularly to a double-layer cryogenic spherical tank and its support structure. Background Art

[0002] Under the national industrial policies that strongly advocate environmental protection and energy conservation, double-layer cryogenic spherical tanks have been widely recognized in the market of cryogenic liquid storage and transportation equipment and have great development space. The static evaporation rate is one of the important parameters for evaluating the cryogenic performance of double-layer cryogenic spherical tanks. How to reduce the index of the static evaporation rate is a factor that must be considered in the design of double-layer cryogenic spherical tanks. Among them, minimizing the heat transfer between the cryogenic liquid medium and the ambient temperature can effectively reduce the static evaporation rate index.

[0003] When the volume of the double-layer cryogenic spherical tank is relatively large, the number of support structures is also relatively large, resulting in more heat transfer at the support points. Exemplarily, for a theoretical calculation of a double-layer cryogenic spherical tank with a volume of 400 m 3 , the heat entering through the support structure position accounts for more than 42% of the total heat leakage. Therefore, how to reduce the heat leakage of the support structure is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a support structure with a relatively low heat leakage and a double-layer cryogenic spherical tank having the support structure to solve the problems in the prior art.

[0005] To solve the above technical problems, the present invention provides a support structure for a double-layer cryogenic spherical tank. The double-layer cryogenic spherical tank includes an inner spherical tank and an outer spherical tank covering the inner spherical tank. The support structure includes a bottom plate, and an internal support member and an external support member provided on the bottom plate. The external support member is sleeved outside the internal support member; the top of the external support member is connected to the outer spherical tank;

[0006] The internal support member includes a heat insulation member, an upper support column connected to the upper end of the heat insulation member, and a lower support column connected to the lower end of the heat insulation member. The upper support column is connected to the equatorial plate of the inner spherical tank, and the lower support column is connected to the bottom plate. The heat insulation member includes an upper heat insulation plate, an upper connecting plate, a middle heat insulation plate, a lower connecting plate, and a lower heat insulation plate arranged in sequence from top to bottom, and fasteners. The materials of the upper heat insulation plate, the middle heat insulation plate, and the lower heat insulation plate are all fiberglass. The fasteners pass through the upper heat insulation plate, the upper connecting plate, the middle heat insulation plate, the lower connecting plate, and the lower heat insulation plate simultaneously to achieve connection. The upper connecting plate is connected to the upper support column, and the lower connecting plate is connected to the lower support column. The upper heat insulation plate is annular, and the inner end of the upper heat insulation plate has a protruding portion protruding downward to isolate the fasteners from the upper connecting plate. The lower heat insulation plate is annular, and the inner end of the lower heat insulation plate has a protruding portion protruding upward to isolate the fasteners from the lower connecting plate.

[0007] In one embodiment, the upper connecting plate is annular, and there is a circumferential gap between the inner wall of the upper connecting plate and the inner end of the upper heat insulation plate, allowing circumferential movement between the upper connecting plate and the heat insulation plate.

[0008] The protruding portion abuts against the lower connecting plate to achieve an interference fit between the lower heat insulation plate and the lower connecting plate.

[0009] In one embodiment, there is a circumferential gap between the middle heat insulation plate and the fasteners.

[0010] In one embodiment, the heat insulation member further includes a cover body covering the upper connecting plate. The material of the cover body is stainless steel. The top of the cover body is connected to the upper support column. An accommodating space is formed between the cover body and the upper connecting plate. The upper heat insulation plate and the top of the fasteners are located in the accommodating space.

[0011] In one embodiment, an interlayer space is formed between the outer spherical tank and the inner spherical tank.

[0012] There is a circumferential gap between the external support member and the internal support member to form a gap space. The gap space communicates with the interlayer space, and a vacuum environment can be formed simultaneously.

[0013] A through hole is also formed in the vertical middle part of the middle heat insulation plate. The through hole communicates with the fasteners and also communicates with the gap space.

[0014] In one embodiment, an upper washer is further provided between the fasteners and the upper heat insulation plate. The material of the upper washer is stainless steel.

[0015] A lower washer is further provided between the fastener and the lower heat insulation plate, and the material of the lower washer is stainless steel.

[0016] In one embodiment, the outer peripheries of the upper support column and the lower support column are both coated with heat insulation covers;

[0017] The interiors of the upper support column and the lower support column are both filled with heat preservation cotton.

[0018] In one embodiment, the outer periphery of the external support member is coated with a fireproof coating.

[0019] The present invention also provides a double-layer cryogenic spherical tank, which includes an inner spherical tank, an outer spherical tank covering the inner spherical tank, and a plurality of support structures as described above. The plurality of support structures are evenly distributed along the equatorial plate of the inner spherical tank.

[0020] In one embodiment, the double-layer cryogenic spherical tank further includes a tie rod structure disposed between any two adjacent support structures. The tie rod structure includes two tie rods arranged in a cross manner. One end of each tie rod is connected to the bottom of the external support member, and the other end is connected to the top of the external support member of another support structure.

[0021] It can be seen from the above technical solutions that the advantages and positive effects of the present invention are as follows:

[0022] The support structure in the present invention includes a heat insulation member, an upper support column, and a lower support column. The heat insulation member includes an upper heat insulation plate, an upper connecting plate, an intermediate heat insulation plate, a lower heat insulation plate, and a lower connecting plate arranged in sequence from top to bottom, and the connection is achieved by sequentially passing a fastener through the above components. Through the arrangement of the upper heat insulation plate, the lower heat insulation plate, and the intermediate heat insulation plate, the cold quantity on the inner spherical tank is prevented from being transferred to the fastener through the contact of the upper support column, resulting in the loosening of the fastener, and is also prevented from being transferred to the lower support column and the bottom plate through the contact with the lower support column.

[0023] Furthermore, the upper heat insulation plate and the upper connecting plate can move circumferentially, enabling the upper support column and the lower support column to move relative to each other. As a result, the inner spherical tank can freely slide within the support plane, avoiding uneven distribution of the load of the inner spherical tank caused by the shrinkage displacement of the inner spherical tank, avoiding secondary stress at the support position, evenly distributing the load of the inner spherical tank, and improving the service life of the double-layer cryogenic spherical tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of one embodiment of the double-layer cryogenic spherical tank in the present invention.

[0025] Figure 2 is in the present invention Figure 1 partial top view.

[0026] Figure 3It is a partial schematic view of the support structure, inner spherical tank and outer spherical tank in the present invention.

[0027] Figure 4 It is in the present invention Figure 3 Partial enlarged schematic view.

[0028] Figure 5 It is in the present invention Figure 4 Schematic view of the upper connecting plate and upper heat insulation plate.

[0029] Figure 6 It is a connection schematic view between the support structure and the tie rod in the present invention.

[0030] Explanation of reference numerals is as follows:

[0031] 800, double-layer cryogenic spherical tank; 1, inner spherical tank; 2, outer spherical tank; 3, support structure; 31, bottom plate; 32, internal support member; 321, heat insulation member; 3211, intermediate heat insulation plate; 3212, upper connecting plate, 3213, lower connecting plate; 3214, upper heat insulation plate; 3215, lower heat insulation plate; 3216, cover body; 3217, upper washer; 3218, lower washer; 3219, fastener; 322, upper support column; 323, lower support column; 33, external support member; 41, tie rod. Detailed implementation manners

[0032] Typical implementation manners reflecting the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different implementation manners, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are for illustrative purposes in essence and are not used to limit the present invention.

[0033] To further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0034] The present invention provides a double-layer cryogenic spherical tank, which is suitable for storing cryogenic liquid media, especially suitable for storing ultra-low temperature liquid media. Exemplarily, the ultra-low temperature liquid medium can be liquid nitrogen (-269 °C), liquid hydrogen (-253 °C).

[0035] Figure 1 Shows the structural schematic view of the double-layer cryogenic spherical tank. Refer to Figure 1, the double-layer cryogenic spherical tank 800 includes an inner spherical tank 1, an outer spherical tank 2, and a plurality of support structures 3. Through the plurality of support structures 3, the weight of the inner spherical tank 1 and the storage medium therein, as well as the weight of the outer spherical tank 2, are reasonably distributed to the bottom of the support structures 3, and then to the spherical tank foundation. Each support structure 3 reduces the heat transfer at the support points of the inner spherical tank 1 and the outer spherical tank 2, and reduces the heat leakage. At the same time, since the support structure 3 reduces the heat transfer, it avoids the displacement of the inner spherical tank 1 due to low-temperature shrinkage, thereby avoiding stress concentration at the support points.

[0036] The inner spherical tank 1 is used to contain cryogenic liquid media, and its outer surface is coated with a heat-insulating layer. The heat-insulating layer adopts a composite heat-insulating layer of aluminum foil paper + fiberglass paper.

[0037] The outer spherical tank 2 wraps the inner spherical tank 1, and there is an interlayer space formed between them. The interlayer space is evacuated to a high-vacuum state. A plurality of openings are provided at the bottom of the outer spherical tank 2.

[0038] A plurality of support structures 3 are used to jointly support the inner spherical tank 1 and the outer spherical tank 2. Specifically, the plurality of support structures 3 are evenly distributed along the equatorial plate of the inner spherical tank 1.

[0039] Each support structure 3 includes a bottom plate 31, and an internal support member 32 and an external support member 33 provided on the bottom plate 31. Among them, both the internal support member 32 and the external support member 33 stand on the bottom plate 31.

[0040] The bottom plate 31 is arranged on the spherical tank foundation. Specifically, refer to Figure 2 , a U-shaped slot is formed on the bottom plate 31 for connecting with the anchor bolts pre-buried in the spherical tank foundation.

[0041] Combined with Figure 3 and Figure 4 , the internal support member 32 includes a heat-insulating member 321, an upper support column 322 connected to the upper end of the heat-insulating member 321, and a lower support column 323 connected to the lower end of the heat-insulating member 321.

[0042] The top of the upper support column 322 is connected to the equatorial plate of the inner spherical tank 1, and the bottom is connected to the heat-insulating member 321. The upper support column 322 is made of stainless steel and can withstand low temperatures.

[0043] The top of the lower support column 323 is connected to the heat-insulating member 321, and the bottom is connected to the bottom plate 31. The lower support column 323 is made of stainless steel and can withstand low temperatures.

[0044] In this embodiment, both the upper support column 322 and the lower support column 323 are made of austenitic stainless steel.

[0045] Among them, the outer circumferences of the upper support column 322 and the lower support column 323 are both covered with heat insulation covers. The interiors of the upper support column 322 and the lower support column 323 are both filled with heat insulation cotton. By using the above-mentioned upper support column 322 and lower support column 323, the transfer of heat can be effectively blocked.

[0046] The heat insulation member 321 is disposed between the upper support column 322 and the lower support column 323, and can reduce the transfer of heat.

[0047] Specifically, along the vertical direction of the support structure 3, the heat insulation member 321 is located at the bottom of the outer spherical tank 2 and at the opening of the outer spherical tank 2.

[0048] The heat insulation member 321 includes an intermediate heat insulation plate 3211, upper connecting plates 3212 and lower connecting plates 3213 respectively arranged at the top and bottom of the heat insulation plate, an upper heat insulation plate 3214 located at the top of the upper connecting plate 3212, a lower heat insulation plate 3215 located at the bottom of the lower connecting plate 3213, and fasteners 3219. That is, from top to bottom are the upper heat insulation plate 3214, the upper connecting plate 3212, the intermediate heat insulation plate 3211, the lower heat insulation plate 3215 and the lower connecting plate 3213. The materials of the upper heat insulation plate 3214, the intermediate heat insulation plate 3211 and the lower heat insulation plate 3215 are all fiberglass reinforced plastic, and the materials of the upper connecting plate 3212 and the lower connecting plate 3213 are all stainless steel, that is, the plates of fiberglass reinforced plastic material and the plates of stainless steel material are arranged alternately.

[0049] In this embodiment, the materials of the upper connecting plate 3212 and the lower connecting plate 3213 are both austenitic stainless steel.

[0050] Bolting holes penetrating up and down are provided in the middle parts of the upper heat insulation plate 3214, the upper connecting plate 3212, the intermediate heat insulation plate 3211, the lower heat insulation plate 3215 and the lower connecting plate 3213 for the fasteners 3219 to pass through.

[0051] The fasteners 3219 pass through the upper heat insulation plate 3214, the upper connecting plate 3212, the intermediate heat insulation plate 3211, the lower connecting plate 3213 and the lower heat insulation plate 3215 at the same time to achieve connection. Specifically, the fasteners 3219 include studs and nuts respectively arranged at both ends of the studs, and the nuts are screwed to the studs. The studs pass through the connection holes on the upper heat insulation plate 3214, the upper connecting plate 3212, the intermediate heat insulation plate 3211, the lower heat insulation plate 3215 and the lower connecting plate 3213 at the same time, and tightening the nuts realizes the connection. One of the nuts is located at the top of the upper heat insulation plate 3214, and the other nut is located at the bottom of the lower heat insulation plate 3215.

[0052] The upper heat insulation plate 3214 is annular, and a bolting hole is provided in the middle thereof. The inner end of the upper heat insulation plate 3214 has a protruding part protruding downward. Herein, the inner and outer are referenced with respect to the usage state of the heat insulation member 321. The position facing the inside of the heat insulation member 321 is the inner end, and vice versa is the outer end.

[0053] The upper connecting plate 3212 is annular, and a through hole is formed in the middle thereof, and the through hole constitutes a bolt hole. The diameter of the through hole is larger than the bolt hole on the upper heat insulation plate 3214, so that the inner end of the upper heat insulation plate 3214 extends inward beyond the inner end of the upper connecting plate 3212.

[0054] Wherein, the outer end of the upper connecting plate 3212 extends outward beyond the outer end of the upper heat insulation plate 3214.

[0055] The protruding portion of the upper heat insulation plate 3214 protrudes downward to insulate the fastener 3219 from the upper connecting plate 3212. In this embodiment, the bottom of the protruding portion is flush with the bottom of the upper connecting plate 3212, so that the protruding portion overlaps on the middle heat insulation plate 3211. In other embodiments, the bottom of the protruding portion may also extend beyond the bottom of the upper connecting plate 3212.

[0056] Refer to Figure 5 , there is a circumferential gap between the outer end of the protruding portion of the upper heat insulation plate 3214 and the inner end of the upper connecting plate 3212, so that the upper heat insulation plate 3214 and the upper connecting plate 3212 can move circumferentially. When the inner spherical tank 1 is precooled and filled with liquid, the temperature of the tank wall will drop sharply from normal temperature (for example, -253 °C, -269 °C), resulting in serious shrinkage. Exemplarily, after the inner spherical tank 1 is filled with liquid hydrogen medium, there is a large circumferential shrinkage in the circumferential direction of the inner spherical tank 1. For a 1 m stainless steel, the shrinkage is about 4 mm. Taking a 400 m3 liquid hydrogen spherical tank as an example, its inner sphere diameter is 9 m, and the circumferential shrinkage will reach 36 mm.

[0057] Therefore, in this application, through the movement between the upper heat insulation plate 3214 and the upper connecting plate 3212, the upper support column 322 and the lower support column 323 move relative to each other, so that the inner spherical tank 1 can slide freely in the support plane, avoiding uneven distribution of the load of the inner spherical tank 1 caused by the shrinkage displacement of the inner spherical tank 1, avoiding secondary stress at the support position, making the load of the inner spherical tank 1 evenly distributed, and improving the service life of the double-layer cryogenic spherical tank 800.

[0058] Furthermore, an upper washer 3217 is provided between the upper heat insulation plate 3214 and the fastener 3219, and the material of the upper washer 3217 is stainless steel. The upper washer 3217 is located between the upper heat insulation plate 3214 and the nut.

[0059] The middle heat insulation plate 3211 is annular, and an installation hole is formed in the middle thereof. The axis of the installation hole extends vertically and constitutes a bolt hole.

[0060] Furthermore, the diameter of the installation hole is larger than the diameter of the stud of the fastener 3219, so that there is a circumferential gap between the middle heat insulation plate 3211 and the fastener 3219, avoiding direct contact between the middle heat insulation plate 3211 and the fastener 3219 for heat transfer.

[0061] In this embodiment, the diameter of the mounting hole is larger than the bolt hole on the upper heat insulation plate 3214, and the diameter of the mounting hole is smaller than the diameter of the through hole. Specifically, the circumferential interval between the inner wall of the intermediate heat insulation plate 3211 and the stud is 3 mm.

[0062] A perforation is also formed in the vertical middle part of the intermediate heat insulation plate 3211. The perforation communicates with the mounting hole and thus with the fastener 3219. Specifically, the axis of the perforation extends along the radial direction of the intermediate heat insulation plate 3211.

[0063] And the perforation communicates with the gap space between the external support member 33 and the internal support member 32.

[0064] The lower connecting plate 3213 is annular, and a through hole is formed in the middle thereof, and the through hole forms a bolt hole.

[0065] The lower heat insulation plate 3215 is annular, and a bolt hole is formed in the middle thereof. The inner end of the lower heat insulation plate 3215 has a protruding portion protruding upward. The diameter of the bolt hole on the lower heat insulation plate 3215 is smaller than the diameter of the through hole, so that the inner end of the lower heat insulation plate 3215 extends inward beyond the inner end of the lower connecting plate 3213. And the protruding portion extends into the through hole to insulate the fastener 3219 from the lower connecting plate 3213.

[0066] In this embodiment, the top of the protruding portion is flush with the top of the lower connecting plate 3213, so that the protruding portion abuts against the intermediate heat insulation plate 3211. In other embodiments, the top of the protruding portion may also extend beyond the top of the lower connecting plate 3213.

[0067] When the protruding portion of the lower heat insulation plate 3215 extends into the through hole, the protruding portion abuts against the lower connecting plate 3213, that is, an interference fit between the lower heat insulation plate 3215 and the lower connecting plate 3213 is achieved.

[0068] The outer end of the lower connecting plate 3213 extends beyond the outer end of the lower heat insulation plate 3215. The lower connecting plate 3213 is fixedly connected to the lower support column 323.

[0069] A lower washer 3218 is further provided between the lower heat insulation plate 3215 and the fastener 3219. The material of the lower washer 3218 is stainless steel. The lower washer 3218 is located between the lower heat insulation plate 3215 and the nut.

[0070] Furthermore, the heat insulation member 321 further includes a cover body 3216 covering the upper connecting plate 3212. The top of the cover body 3216 is connected to the upper support column 322. A receiving space is formed between the cover body 3216 and the upper connecting plate 3212. The tops of the upper heat insulation plate 3214, the upper washer 3217 and the fastener 3219 are located in the receiving space. The material of the cover body 3216 is stainless steel.

[0071] In this embodiment, the cover 3216 includes a cylindrical side wall and a top wall covering the top of the side wall. There is a circumferential gap between the outer end of the side wall and the upper heat insulation plate 3214, and the side wall extends outward beyond the upper heat insulation plate 3214. There is a gap between the outer end of the side wall and the outer end of the upper connecting plate 3212, and the upper connecting plate 3212 extends outward beyond the side wall.

[0072] The setting of the cover 3216 increases the length of the thermal bridge, reduces heat transfer, and at the same time, the setting of the cover 3216 also provides space for the installation of the fastener 3219.

[0073] The heat insulation member 321 not only functions to connect the upper support column 322 and the lower support column 323, but also isolates the heat transfer between the upper support column 322 and the lower support column 323. The principle is as follows:

[0074] The heat insulation member 321 is fixedly connected to the upper support column 322 and the lower support column 323 respectively to achieve the connection between the two. The heat insulation member 321 includes an upper washer 3217, an upper heat insulation plate 3214, an upper connecting plate 3212, an intermediate heat insulation plate 3211, a lower heat insulation plate 3215, a lower connecting plate 3213, and a lower washer 3218 arranged in sequence from top to bottom. The connection is achieved by sequentially passing the fastener 3219 through the above components, that is, the connection of the components of the heat insulation member 321 is achieved by screwing.

[0075] The heat insulation member 321 realizes the function of isolating heat transfer through the upper heat insulation plate 3214, the intermediate heat insulation plate 3211, and the lower heat insulation plate 3215, and realizes better connection strength through the upper washer 3217, the upper connecting plate 3212, the lower connecting plate 3213, and the lower washer 3218.

[0076] Specifically, when the cold of the inner spherical tank 1 is transferred to the upper support column 322 and the upper support column 322 is transferred to the upper connecting plate 3212 through the cover 3216, the intermediate heat insulation plate 3211 isolates the downward transfer of the cold of the upper connecting plate 3212. The upper heat insulation plate 3214 isolates the fastener 3219 and the upper connecting plate 3212, preventing the cold of the upper connecting plate 3212 from being transferred to the fastener 3219. The lower heat insulation plate 3215 isolates the fastener 3219 and the lower connecting plate 3213, preventing the cold on the fastener 3219 from being transferred to the lower connecting plate 3213 and then to the lower support column 323. That is, through the setting of the heat insulation member 321, the cold on the inner spherical tank 1 is prevented from being transferred to the fastener 3219 through the contact of the upper support column 322, resulting in the loosening of the fastener 3219, and is prevented from being transferred to the lower support column 323 and the bottom plate 31 through the contact of the fastener 3219 with the lower support column 323.

[0077] The installation steps of the internal support member 32 are as follows:

[0078] Fix the top of the upper support column 322 to the equatorial plate of the inner spherical tank 1, assemble and grind it, and then fix the bottom of the upper support column 322 to the top of the cover body 3216.

[0079] Place the upper washer 3217, upper heat insulation plate 3214, upper connecting plate 3212, middle heat insulation plate 3211, lower heat insulation plate 3215, lower connecting plate 3213 and lower washer 3218 in sequence from top to bottom, then pass the stud through the above components simultaneously, and screw nuts at both ends of the stud to obtain a transition structural member.

[0080] Fix the lower support column 323 to the bottom plate 31.

[0081] Connect the transition structural member to the lower support column 323. Specifically, connect the cover body 3216 to the upper connecting plate 3212, and cover the upper washer 3217, upper heat insulation plate 3214 and connecting plate inside the cover body 3216. Weld the lower connecting plate 3213 to the top of the lower support column 323, and the lower connecting plate 3213, lower heat insulation plate 3215 and lower washer 3218 are all located inside the lower support column 323. Complete the installation of the internal support member 32.

[0082] The external support member 33 is sleeved outside the internal support member 32. Specifically, the external support member 33 is in a cylindrical shape, its bottom is fixedly connected to the bottom plate 31, and its top is fixedly connected to the bottom of the outer spherical tank 2.

[0083] There is a gap between the inner wall of the external support member 33 and the outer wall of the internal support to form a gap space, and this gap space communicates with the interlayer space, so that a vacuum can be formed simultaneously to prevent heat conduction and heat convection between the internal support member 32 and the external support member 33.

[0084] Moreover, the perforations provided on the middle heat insulation plate 3211 communicate with both the interlayer space and the gap space at the same time, so that the installation hole of the middle heat insulation plate 3211 is also in a vacuum environment. The fastener 3219 is located in the installation hole and has a gap with the middle heat insulation plate 3211, thereby preventing heat conduction and heat convection between the fastener 3219 and the middle heat insulation plate 3211.

[0085] The material of the external support member 33 is stainless steel or carbon steel.

[0086] The outer periphery of the external support member 33 is coated with a fireproof coating, so as to ensure that the fire resistance time is not less than 2 hours.

[0087] The double-layer low-temperature spherical tank 800 further includes a tie rod structure arranged between any two adjacent support structures 3 to increase the support strength. Refer to Figure 6 , the tie rod structure includes two tie rods 41 arranged crosswise. One end of each tie rod 41 is connected to the bottom of the external support member 33, and the other end is connected to the top of the external support member 33 of another support structure 3.

[0088] As can be seen from the above technical solution, the advantages and positive effects of the present invention are as follows:

[0089] The support structure in the present invention includes a heat insulation member, an upper support column, and a lower support column. The heat insulation member includes an upper heat insulation plate, an upper connecting plate, an intermediate heat insulation plate, a lower heat insulation plate, and a lower connecting plate which are arranged in sequence from top to bottom, and the connection is achieved by sequentially passing fasteners through the above components. The arrangement of the upper heat insulation plate, the lower heat insulation plate, and the intermediate heat insulation plate avoids the cold quantity on the inner spherical tank from being transferred to the fasteners through the contact of the upper support column, resulting in the loosening of the fasteners, and also avoids being transferred to the lower support column and the bottom plate through the contact with the lower support column.

[0090] Furthermore, the upper heat insulation plate and the upper connecting plate can move relative to each other circumferentially, enabling the upper support column and the lower support column to move relative to each other, and further enabling the inner spherical tank to freely slide within the support plane. This avoids uneven distribution of the load of the inner spherical tank caused by the shrinkage displacement of the inner spherical tank, avoids secondary stress at the support position, evenly distributes the load of the inner spherical tank, and improves the service life of the double-layer low-temperature spherical tank.

[0091] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A support structure for a double-layer cryogenic spherical tank, the double-layer cryogenic spherical tank comprising an inner spherical tank and an outer spherical tank covering the inner spherical tank, characterized in that, The support structure includes a bottom plate, an internal support member and an external support member disposed on the bottom plate. The external support member is sleeved outside the internal support member. The top of the external support member is connected to the outer spherical tank. The internal support member includes a heat insulation member, an upper support column connected to the upper end of the heat insulation member, and a lower support column connected to the lower end of the heat insulation member. The upper support column is connected to the equatorial plate of the inner spherical tank, and the lower support column is connected to the bottom plate. The heat insulation member includes an upper heat insulation plate, an upper connecting plate, a middle heat insulation plate, a lower connecting plate and a lower heat insulation plate arranged in sequence from top to bottom, and fasteners. The upper heat insulation plate, the middle heat insulation plate and the lower heat insulation plate are all made of glass fiber reinforced plastic. The fasteners pass through the upper heat insulation plate, the upper connecting plate, the middle heat insulation plate, the lower connecting plate and the lower heat insulation plate at the same time to achieve connection. The upper connecting plate is connected to the upper support column, and the lower connecting plate is connected to the lower support column. The upper heat insulation plate is annular and the inner end of the upper heat insulation plate has a convex portion protruding downward to isolate the fasteners from the upper connecting plate. The lower heat insulation plate is annular and the inner end of the lower heat insulation plate has a protruding portion protruding upward to isolate the fasteners from the lower connecting plate. The upper connecting plate is annular, and there is a circumferential gap between the inner wall of the upper connecting plate and the inner end of the upper heat insulation plate, allowing circumferential movement between the upper connecting plate and the heat insulation plate. The protruding portion abuts against the lower connecting plate to achieve an interference fit between the lower heat insulation plate and the lower connecting plate. The heat insulation member further includes a cover body covering the upper connecting plate. The cover body is made of stainless steel. The top of the cover body is connected to the upper support column. A receiving space is formed between the cover body and the upper connecting plate. The upper heat insulation plate and the top of the fasteners are located in the receiving space.

2. The support structure of the double-layer cryogenic spherical tank according to claim 1, characterized in that, There is a circumferential gap between the middle heat insulation plate and the fasteners.

3. The support structure of the double-layer cryogenic spherical tank according to claim 1, characterized in that A sandwich space is formed between the outer spherical tank and the inner spherical tank. There is a circumferential gap between the external support member and the internal support member to form a gap space. The gap space communicates with the sandwich space, and a vacuum environment can be formed simultaneously. A through hole is also formed in the vertical middle part of the middle heat insulation plate. The through hole communicates with the fasteners and also communicates with the gap space.

4. The support structure of the double-layer cryogenic spherical tank according to claim 1, characterized in that, An upper washer is further provided between the fasteners and the upper heat insulation plate. The upper washer is made of stainless steel. A lower washer is further provided between the fasteners and the lower heat insulation plate. The lower washer is made of stainless steel.

5. The support structure of the double-layer cryogenic spherical tank according to claim 1, characterized in that, The outer peripheries of the upper support column and the lower support column are both coated with heat insulation quilts. The interiors of the upper support column and the lower support column are both filled with heat insulation cotton.

6. The support structure of the double-layer cryogenic spherical tank according to claim 1, characterized in that, The outer periphery of the external support member is coated with a fireproof coating.

7. A double-layer low-temperature spherical tank, characterized in that, It includes an inner spherical tank, an outer spherical tank covering the inner spherical tank, and a plurality of support structures as described in any one of claims 1 to 6. The plurality of support structures are evenly distributed along the equatorial plate of the inner spherical tank.

8. The double-layer cryogenic spherical tank according to claim 7, characterized in that, The double-layer cryogenic spherical tank further includes a tie rod structure disposed between any two adjacent support structures. The tie rod structure includes two tie rods arranged crosswise. One end of each tie rod is connected to the bottom of the external support member, and the other end is connected to the top of the external support member of another support structure.

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