CN115234824A - Heat insulation supporting structure of large-capacity liquid hydrogen storage tank - Google Patents

Abstract

The application relates to a thermal-insulated bearing structure of large capacity liquid hydrogen basin relates to liquid hydrogen transport tank field. The liquid hydrogen storage tank comprises an inner tank body and an outer tank body which are nested with each other, the inner tank body and the outer tank body are both of a capsule-shaped structure integrally, two groups of supporting assemblies are arranged between the inner tank body and the outer tank body, and the two groups of supporting assemblies are used for connecting and supporting the inner tank body and the outer tank body at two ends of the liquid hydrogen storage tank respectively. The structural stability of liquid hydrogen basin has been reinforceed to this application to reduced liquid hydrogen and external heat exchange through bearing structure, improved the support and the heat-proof quality of liquid hydrogen basin.

Description

A thermal insulation support structure for a large-capacity liquid hydrogen storage tank

technical field

The present application relates to the technical field of liquid hydrogen transport tanks, and in particular, to a thermal insulation support structure for a large-capacity liquid hydrogen storage tank.

Background technique

Liquid hydrogen, commonly known as liquid hydrogen, is a liquid obtained by cooling hydrogen gas. Liquid hydrogen needs to be kept at very low temperatures (about 20.268 Kelvin, or -252.8°C). The density of liquid hydrogen at 20 Kelvin is about 70.8 kilograms per cubic meter. In aerospace applications, it is often used as fuel for rocket launches to provide energy for rockets. Now it is gradually used for civilian use as a new type of new energy vehicle. energy use.

The Chinese Patent Publication No. CN108332052A discloses a novel support structure and a cryogenic container having the same. The support structure is arranged at the front and rear ends of the cryogenic container, and includes an outer support flange and a sleeve, the outer support flange is connected with the outer head of the cryogenic container, the sleeve is a multi-layer structure, and the sleeve is provided with an inner support The flange, the inner support flange is fixedly connected with the inner head of the cryogenic container. The invention adopts a multi-layer casing structure, which increases the heat conduction paths of the front and rear supports, thereby reducing the introduction of external heat, reducing the evaporation rate of the product, and improving the performance index of the product.

In view of the above-mentioned related technologies, the inventors found that the current horizontal liquid hydrogen transport tank support structure and the connecting part of the head have low stability. Especially when transporting large volumes of liquid hydrogen, the length of the tank is more than 10 meters. Since the weight of the liquid hydrogen in the transport tank usually reaches more than ten tons, during the movement, the inertia of the liquid hydrogen will impact the support connection parts at both ends, and a large stress will be generated at the position where the support structure and the head are connected, thus Deformation, skewness and even leakage of the support structure and head part.

SUMMARY OF THE INVENTION

In order to reduce the stress caused by the impact of liquid hydrogen at the position where the support structure and the head are connected, resulting in the deformation of the support structure and the head part or even leakage, the present application provides a thermal insulation support structure for a large-capacity liquid hydrogen storage tank .

The thermal insulation support structure of a large-capacity liquid hydrogen storage tank provided by the application adopts the following technical solutions:

A thermal insulation support structure for a large-capacity liquid hydrogen storage tank, comprising an inner tank body and an outer tank body that are nested with each other, the inner tank body and the outer tank body are both capsule-shaped structures as a whole, and the inner tank body and the outer tank body are in the form of capsules. Two sets of support assemblies are arranged therebetween, and the two sets of support assemblies respectively connect and support the inner tank body and the outer tank body at both ends of the liquid hydrogen storage tank.

By adopting the above technical solution, the structural integrity of the inner tank body head is stronger, and the problem of stress concentration at the connection position between the support structure and the inner tank body is reduced, so that the liquid hydrogen storage tank can carry more The impact force generated by inertia during transportation also reduces the deformation of the inner tank.

Optionally, a support pipe is respectively fixed on the outer side walls of the heads at both ends of the inner tank body, and the support assembly is sleeved on the outer side walls of the support pipe, and the support assembly includes a head fixed to the outer tank body. The forging flange on the inner wall and one end extending into the inner cavity of the outer tank, and a plurality of sleeves that are nested and fixed on the forging flange to connect and support the support pipe and the forging flange, and two adjacent sleeves Thermal insulation gaps are arranged between the tubes and between the casing and the support tube.

By adopting the above technical solution, the installation structure of fixing the support pipe on the outer wall of the inner tank minimizes the extrusion of the support structure caused by the impact force of liquid hydrogen, thereby ensuring the stability of the support structure. In addition, the multiple nested sleeves ensure the supporting capacity of the support assembly as much as possible. The setting of the thermal insulation gap reduces the contact area between the multiple sleeves and between the sleeves and the support pipe, and reduces the heat passage as much as possible. Efficiency of the transfer by the support assembly.

Optionally, the support assembly further includes a glass fiber reinforced plastic support ring, the glass fiber reinforced plastic support ring is arranged in the thermal insulation gap between the sleeve and the support pipe, and the outer peripheral surface of the glass fiber reinforced plastic support ring is in close contact with the inner peripheral surface of the sleeve. In close contact, the inner peripheral surface of the FRP support ring is tightly abutted with the outer peripheral surface of the support tube.

By adopting the above technical solution, the FRP support ring is a poor conductor of heat, which can effectively reduce the heat conduction through the FRP support ring, and at the same time, the FRP support ring can effectively increase the support area of the support assembly to the support rod, thereby improving the support component to the support tube. support stability.

Optionally, the number of the sleeves is divided into three, which are respectively named as the first sleeve, the second sleeve and the third sleeve from the inside to the outside. A first stepped ring supporting the thermal insulation gap between the first sleeve and the second sleeve, and the ends of the first sleeve and the second sleeve are respectively sleeved and attached to the outer peripheral surface of the first stepped ring with different diameters The end of the second sleeve away from the first stepped ring is provided with a second stepped ring for supporting the thermal insulation gap between the second sleeve and the third sleeve, and the ends of the second sleeve and the third sleeve are The third sleeve is sleeved and fixed on the outer peripheral surface of the second stepped ring with different diameters; the end of the third sleeve away from the second stepped ring is sleeved and fixed on the end of the forging flange extending into the outer tank cavity .

By adopting the above technical solution, the distance for heat exchange with liquid hydrogen through the support assembly is extended, the heat exchange efficiency is reduced, and the thermal insulation performance of the inner tank is improved.

Optionally, two positioning rings are fixed on the inner side wall of the first sleeve, and the FRP support ring is clamped and fixed between the two positioning rings.

By adopting the above technical solution, the integrity of the glass fiber reinforced plastic support ring and the first sleeve is improved, and the separation and fall of the glass fiber reinforced plastic support ring and the first sleeve is reduced.

Optionally, a limit ring is fixed on the outer wall of the end portion of the support tube away from the inner tank, and the side of the limit ring facing the FRP support ring abuts against the FRP support ring.

By adopting the above technical solution, the movable range of the FRP support ring is reduced, and the situation that the FRP support ring and the support tube slip and fall off is reduced.

Optionally, the limit ring at one end of the inner tank body is in contact with the glass fiber reinforced plastic support ring, and the limit ring at the other end of the inner tank body is in contact with the glass fiber reinforced plastic support ring. There is a cold shrinkage gap between them.

By adopting the above technical solution, when the length of the inner tank changes due to temperature, the FRP support ring will slide relatively in the shrinkage gap, thereby reducing the extrusion and damage of the support assembly caused by the expansion and contraction of the inner tank.

Optionally, an orientation strip with a square cross-section is integrally provided on the outer wall of the support tube at the position where the cold shrinkage gap is reserved, along the length direction of the liquid hydrogen storage tank, and an orientation strip with a square cross section is provided on the glass fiber reinforced plastic at the position corresponding to the orientation strip. The orientation slot is adapted to the orientation strip, and the orientation strip is slidably connected in the orientation slot.

By adopting the above technical solution, the relative rotation between the support assembly and the support tube due to the shaking of the inner and outer tanks during the transportation of the liquid hydrogen storage tank is reduced, and the torsional force on both ends of the FRP support ring is uneven. damaged condition.

Optionally, the FRP support is a ring-shaped structure with a uniform wall thickness.

By adopting the above technical solutions, the force-bearing performance of the FRP support is more uniform, and the force-bearing performance of the supporting structure is more stable.

Optionally, the inner hole of the FRP support ring in the support assembly is an eccentric hole, and the thicker side of the FRP support ring is located directly below the axis of the inner tank.

By adopting the above technical solution, the bearing capacity of the liquid hydrogen storage tank to the gravity of the liquid hydrogen is strengthened, and the supporting performance of the support structure for the inner tank body and the liquid hydrogen in the inner tank is improved.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. By setting the inner tank into a complete capsule structure, and fixing the support tube on the outer wall of the inner tank, the problem of stress concentration at the connection position between the support component and the inner tank is reduced, so that the liquid hydrogen storage The tank can bear the greater impact force from the inertia of the liquid hydrogen during transportation, and also reduces the deformation of the inner tank;

2. Through the three-layer casing and two stepped rings, thermal insulation gaps appear between different casings, and the distance of heat conduction is extended, the heat transfer efficiency is reduced, and the heat exchange between liquid hydrogen and the outside world is reduced. Improve the overall thermal insulation performance of the liquid hydrogen storage tank;

3. By limiting the position of the glass fiber reinforced plastic support of one set of support components, and reserve a cold shrinkage gap between the glass fiber reinforced plastic support of another set of support components and the limit ring, it reduces the temperature change of the inner tank. Squeeze and damage to support components due to changes in length.

Description of drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of the liquid hydrogen storage tank in Example 1 of the present application.

FIG. 2 is an enlarged view of part A in FIG. 1 .

FIG. 3 is an enlarged view of part B in FIG. 1 .

FIG. 4 is a schematic cross-sectional view of the support assembly in Embodiment 2 of the present application.

Description of reference numerals: 1. Inner tank; 11. Support pipe; 111. Orientation strip; 12. Limit ring; 13. Fixed plate; 2. Outer tank; 3. Support assembly; 31. Forging flange; 32 33, the first sleeve; 331, the positioning ring; 34, the second sleeve; 35, the third sleeve; 36, the glass fiber reinforced plastic support ring; 37, the first step ring; 38, the second step ring ; 39, cold shrinkage gap.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-4.

The embodiment of the present application discloses a thermal insulation support structure for a large-capacity liquid hydrogen storage tank.

Referring to FIG. 1 , the thermal insulation support structure includes an inner tank 1 and an outer tank 2 that are nested in each other. The inner tank 1 and the outer tank 2 are both capsule-shaped structures as a whole, and the two ends of the inner tank 1 have no depressions. structure. Two groups of support assemblies 3 are arranged between the inner tank 1 and the outer tank 2, and the two groups of support assemblies 3 are respectively arranged at both ends of the liquid hydrogen storage tank to connect and support the inner tank 1 and the outer tank 2, and Under the support of the support assembly 3, there is no direct contact between the inner tank 1 and the outer tank 2. After the vacuum treatment is performed on the space between the inner tank 1 and the outer tank 2, the inner tank 1 and the outer tank 2 will not be in direct contact with each other. A vacuum layer will appear between the outer tanks 2, further reducing the heat transfer between the inner tank 1 and the outer tank 2.

Compared with the inner tank body 1 in the related art in which the "recessed" structure is provided at the positions of the heads at both ends, the inner tank body 1 with a complete capsule structure has stronger integrity, which can effectively reduce the relationship between the support structure and the inner tank body 1 . The occurrence of stress concentration at the connection position also enables the liquid hydrogen storage tank to carry a greater impact force from the inertia of the liquid hydrogen during transportation, and thus reduces the deformation of the inner tank 1 due to the impact force.

Referring to FIG. 2 , a support pipe 11 is coaxially fixed on the outer side wall of the head of the inner tank 1 , the support assembly 3 is sleeved on the outer side wall of the support pipe 11 , and the support element 3 includes a head fixed to the outer tank 2 . The forging flange 31 on the inner wall and one end extending into the inner cavity of the outer tank 2, and a plurality of sleeves which are nested and fixed on the forging flange 31 to connect and support the support tube 11 and the forging flange 31 , and an insulating gap 32 is provided between two adjacent sleeves and between the sleeves and the support pipe 11 .

Further, in order to improve the strength of the position of the head of the inner tank 1 and improve the stability of the support pipe 11 on the inner tank 1, the end of the support pipe 11 close to the inner tank 1 is coaxially welded with a fixed disk 13. The fixed disk 13 is an annular structure, and the surface of the fixing plate 13 facing the inner tank body 1 is completely fit with the inner tank body 1 .

On the one hand, the structure of fixing the support assembly 3 on the outer wall of the inner tank 1 reduces the extrusion of the support structure caused by the impact force of liquid hydrogen as much as possible, and ensures the stability of the support structure; on the other hand, The setting of the thermal gap 32 between the casings reduces the contact area between multiple casings and between the casings and the support pipe 11, reduces the heat transfer efficiency through the support assembly 3 as much as possible, and ensures the safety of the liquid hydrogen storage tank. Insulation ability.

Specifically, the number of sleeves in the embodiment of the present application is three, and none of the three sleeves and the inner tank body 1 are in direct contact. Now, the three sleeves are named as the first sleeve 33 , the second sleeve 34 and the third sleeve 35 respectively from the inside to the outside. The support assembly 3 further includes a glass fiber reinforced plastic support ring 36 , the glass fiber reinforced plastic support ring 36 is arranged in the thermal insulation gap 32 between the first sleeve 33 and the support pipe 11 , and the outer peripheral surface of the glass fiber reinforced plastic support ring 36 is connected to the inner periphery of the first sleeve 33 . The inner peripheral surface of the glass fiber reinforced plastic support ring 36 is in contact with the outer peripheral surface of the support tube 11 tightly.

Since the FRP support ring 36 is a poor conductor of heat, the efficiency of heat conduction through the FRP support ring 36 can be effectively reduced. While the FRP support ring 36 improves the stability of the support assembly 3 supporting the support tube 11, it also minimizes the The heat exchange of the support assembly 3 through the fiberglass support ring 36 is reduced.

The end of the first sleeve 33 away from the inner tank 1 is provided with a first stepped ring 37 for supporting the thermal insulation gap 32 between the first sleeve 33 and the second sleeve 34. The cross section of the first stepped ring 37 is stepped and the ends of the first sleeve 33 and the second sleeve 34 are respectively sleeved and fitted on different outer peripheral surfaces of the first stepped ring 37 to be welded and fixed with the first stepped ring 37; the second sleeve 34 is far away from the first stepped ring 37. The end of the stepped ring 37 is provided with a second stepped ring 38 for supporting the thermal insulation gap 32 between the second sleeve 34 and the third sleeve 35. The cross section of the second stepped ring 38 is stepped, and the second sleeve The ends of 34 and the third sleeve 35 are respectively sleeved and fitted on the outer peripheral surfaces of the second stepped ring 38 with different outer diameters, and are welded and fixed to the second stepped ring 38 .

The end of the third sleeve 35 away from the second stepped ring 38 is sleeved and welded on the end of the forging flange 31 that protrudes into the inner cavity of the outer tank body 2 . When the heat from the outside of the liquid hydrogen storage tank is transferred to the inner tank body 1 through the support assembly 3, it needs to pass through the forging flange 31, the third sleeve 35, the second step ring 38, the second sleeve 34, the first step in sequence. After the ring 37 and the first sleeve 33, it is then transferred to the support tube 11 of the inner tank 1 through the FRP support ring 36. The arrangement of the support assembly 3 extends the distance of direct heat transfer as much as possible, thereby increasing the heat. The difficulty of transfer reduces the heat exchange between liquid hydrogen and the outside world through the support structure.

In order to improve the integrity of the FRP support ring 36 and the first sleeve 33 , two positioning rings 331 are fixed on the inner side wall of the first sleeve 33 , and the FRP support ring 36 is clamped and fixed between the two positioning rings 331 .

Further, the limiting ring 12 is fixedly connected to the outer wall of the end of the support tube 11 away from the inner tank 1 , so as to reduce the situation that the FRP support ring 36 is separated from the support tube 11 .

Referring to FIG. 3 , the limit ring 12 at one end of the inner tank 1 is in contact with the glass fiber reinforced plastic support ring 36 on the side facing the glass fiber reinforced plastic support ring 36 , while the limit ring 12 at the other end of the inner tank 1 is in contact with the second support assembly 3 A cold shrinkage gap 39 is reserved between the FRP support rings 36 .

When the temperature of the inner tank 1 changes, the overall length of the inner tank 1 will change accordingly. At this time, the FRP support ring 36 will move relative to the support tube 11 along the length direction of the inner tank body 1 in the shrinkage gap 39, thereby reducing the extrusion of the inner tank body 1 due to the expansion and contraction of the support structure, which affects the support structure. Structural stability.

In order to prevent the relative rotation between the support assembly 3 and the support tube 11 due to the shaking of the inner and outer tanks 2 during the transportation process, the FRP support ring 36 will have circumferential internal stress due to the difference in the rotation angle between the two ends, resulting in the FRP support ring 36. When the support ring 36 is damaged, an orientation bar 111 with a square cross-section is integrally provided on the outer wall of the support tube 11 with the cold shrinkage gap 39 reserved along the length direction of the liquid hydrogen storage tank. A corresponding position is provided with an orientation groove adapted to the orientation strip 111, and the orientation strip 111 is slidably connected in the orientation slot.

Example 1:

In this embodiment, both the sleeve and the FRP support ring 36 are annular structures with uniform wall thickness, and a plurality of sleeves and the FRP support ring 36 are coaxially arranged.

The force performance of the FRP support ring 36 with uniform wall thickness is more uniform, and the force performance is more stable when encountering bumps and shaking.

The implementation principle of a thermal insulation support structure for a large-capacity liquid hydrogen storage tank in Example 1 of the present application is as follows: during transportation, the three sleeves in the support assembly 3 connect the support pipe 11 and the forging flange 31, Thus, the inner tank body 1 is supported.

The support assembly 3 makes thermal insulation gaps 32 appear between different casings through three layers of casings and two stepped rings, which reduces the heat transfer efficiency, reduces the heat exchange between liquid hydrogen and the outside world, and improves the liquid hydrogen storage tank. Overall thermal insulation performance.

Then, by arranging the FRP support ring 36 between the thermal insulation gap 32 between the support tube 11 and the first sleeve 33, the connection stability between the support assembly 3 and the support tube 11 is improved, and the support tube is further strengthened. Thermal insulation effect between 11 and the first sleeve 33 .

When the liquid hydrogen is charged into the inner tank 1, the temperature of the inner tank 1 gradually decreases with the light filling, and the overall length of the inner tank 1 is shortened. Sliding occurs in the length direction, so as to reduce the pressure exerted by the inner tank 1 on the support assembly 3 and reduce the deformation or skew of the support assembly 3 .

Example 2:

Referring to FIG. 4 , the difference from Embodiment 1 is that in Embodiment 2, the inner hole of the FRP support ring 36 in the support assembly 3 is an eccentric hole, that is, the axis of the inner hole is parallel to the central axis of its outer surface and is not coincide.

After installation, the inner hole of the first sleeve 33 is coaxial with the inner tank 1 , and the thicker side of the FRP support ring 36 is located directly below the axis of the inner tank 1 . Such a structure improves the support performance of the support structure for the inner tank body 1 and the liquid hydrogen in the inner tank body 1, and strengthens the ability of the liquid hydrogen storage tank to bear the gravity of the liquid hydrogen.

The implementation principle of the thermal insulation support structure for a large-capacity liquid hydrogen storage tank in this example of the present application is the same as that in Example 1, and the only difference is the force performance, which will not be repeated here.

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (10)

1. The utility model provides a thermal-insulated bearing structure of large capacity liquid hydrogen basin, includes the inner tank body (1) and outer tank body (2) of mutual nested, its characterized in that: the inner tank body (1) and the outer tank body (2) are integrally of a capsule-shaped structure, two sets of supporting components (3) are arranged between the inner tank body (1) and the outer tank body (2), and the supporting components (3) are respectively connected and supported with the outer tank body (2) and the inner tank body (1) at the two ends of the liquid hydrogen storage tank.

2. A thermally insulated support structure for a bulk liquid hydrogen tank according to claim 1, wherein: the utility model discloses a bearing structure, including the inner tank body (1), the outer wall of inner tank body (1) both ends head is gone up and is had a stay tube (11) respectively the rigid coupling, and supporting component (3) cover is located on the lateral wall of stay tube (11), supporting component (3) including rigid coupling on outer tank body (2) head inner wall and forging flange (31) that one end stretched into in outer tank body (2) inner chamber to and the nested rigid coupling of one end go up many sleeve pipes of being connected and supporting stay tube (11) and forging flange (31) on forging flange (31), between two adjacent sleeve pipes, all be provided with thermal-insulated clearance (32) between sleeve pipe and stay tube (11).

3. A thermally insulating support structure for a large-capacity liquid hydrogen tank as claimed in claim 2, wherein: the support assembly (3) further comprises a glass fiber reinforced plastic support ring (36), the glass fiber reinforced plastic support ring (36) is arranged in the heat insulation gap (32) between the sleeve and the support pipe (11), the outer circumferential surface of the glass fiber reinforced plastic support ring (36) is tightly abutted to the inner circumferential surface of the sleeve, and the inner circumferential surface of the glass fiber reinforced plastic support ring (36) is tightly abutted to the outer circumferential surface of the support pipe (11).

4. A thermally insulating support structure for a large-capacity liquid hydrogen tank as claimed in claim 3, wherein: the number of the sleeves is three, the sleeves are named as a first sleeve (33), a second sleeve (34) and a third sleeve (35) from inside to outside respectively, a first step ring (37) used for bearing a heat insulation gap (32) between the first sleeve (33) and the second sleeve (34) is fixedly connected to the end part, far away from the inner tank body (1), of the first sleeve (33), and the end parts of the first sleeve (33) and the second sleeve (34) are respectively sleeved, attached and fixedly connected to the outer peripheral surfaces of the first step ring (37) with different diameters; a second stepped ring (38) used for supporting a heat insulation gap (32) between the second sleeve (34) and the third sleeve (35) is arranged at the end part, far away from the first stepped ring (37), of the second sleeve (34), and the end parts of the second sleeve (34) and the third sleeve (35) are respectively sleeved and fixedly connected on the outer peripheral surfaces of the second stepped ring (38) with different diameters; the end part of the third sleeve (35) far away from the second stepped ring (38) is sleeved and fixedly connected with one end of the forged piece flange (31) extending into the inner cavity of the outer tank body (2).

5. A thermally insulated support structure for a large-capacity liquid hydrogen tank as defined in claim 4, wherein: two positioning rings (331) are fixedly connected to the inner side wall of the first sleeve (33), and the glass fiber reinforced plastic supporting ring (36) is clamped and fixed between the two positioning rings (331).

6. A thermally insulated support structure for a bulk liquid hydrogen tank according to claim 4, wherein: and a limiting ring (12) is fixedly connected to the outer wall of the end part of the supporting tube (11) far away from the inner tank body (1).

7. A thermally insulated support structure for a large-capacity liquid hydrogen tank as claimed in claim 6, wherein: one side that the spacing ring (12) of inner tank body (1) one end is towards glass steel support ring (36) with glass steel support ring (36) looks butt, spacing ring (12) of the inner tank body (1) other end is reserved to have cold shrinkage clearance (39) between one side towards glass steel support ring (36) and glass steel support ring (36).

8. A thermally insulated support structure for a bulk liquid hydrogen tank according to claim 7, wherein: an orientation strip (111) with a square cross section is integrally arranged on the outer wall of the support pipe (11) reserved at the position of the cold contraction gap (39) along the length direction of the liquid hydrogen storage tank, an orientation groove matched with the orientation strip (111) is formed in the position, corresponding to the orientation strip (111), of the glass fiber reinforced plastic support ring (36), and the orientation strip (111) is connected in the orientation groove in a sliding mode.

9. A thermally insulated support structure for a large capacity liquid hydrogen tank as claimed in claim 8, wherein: the glass fiber reinforced plastic support ring (36) is of an annular structure with uniform wall thickness.

10. A thermally insulated support structure for a bulk liquid hydrogen tank according to claim 8, wherein: the inner hole of the glass fiber reinforced plastic support ring (36) in the support component (3) is an eccentric hole, and one side of the glass fiber reinforced plastic support ring (36) with thicker wall thickness is positioned right below the axis of the inner tank body (1).

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