An oval LNG gas cylinder

Abstract

The present invention relates to an elliptical LNG gas cylinder, which comprises an inner liner and an outer liner; the top and bottom ends of the outer liner are respectively reduced in diameter, and the reduced positions are respectively provided with first reinforcing rings; the top and bottom ends of the outer wall of the inner liner are respectively provided with second reinforcing rings; the reduced diameter is reduced by 4-6 mm toward the inside of the outer liner; the width of the reduced diameter is ≥ the width of the first reinforcing ring. The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical LNG gas cylinder by reducing the diameter of the outer liner of the elliptical gas cylinder to match the reinforcing ring provided on the surface of the inner liner, thereby avoiding the formation of high stress concentration points, thereby improving the impact resistance of the gas cylinder. At the same time, the provision of the reinforcing ring can achieve an equivalent reinforcement effect compared to the overall thickening of the bottle body, that is, while optimizing the stress distribution, the weight of the bottle body is reduced.

Description

Technical Field

[0001] The invention relates to the field of gas cylinder design, and in particular to an elliptical LNG gas cylinder. Background Art

[0002] At present, with the continuous rise in fuel costs and labor costs and the fierce competition in the aviation transportation industry, the traditional transportation industry has been hit hard. As the traditional transportation industry continues to seek opportunities to reduce operating costs, liquefied natural gas vehicles have attracted widespread attention from the automotive industry around the world due to their advantages in low fuel prices, clean and environmentally friendly, and long driving range. They have become one of the key advantages for companies to continue to maintain their competitive vitality. This is because liquefied natural gas (LNG) is formed by the liquefaction of natural gas at a temperature of -162°C. Its main component is methane. It is a clean energy source that causes much less pollution to the environment than oil and coal. Density 430-470 (kg / m 3 ), which is three times that of CNG, with a large storage capacity and long driving range for the same volume.

[0003] However, with the rapid development of the transportation industry, the requirements for the endurance of on-board LNG cylinders are getting higher and higher. However, the traditional on-board LNG cylinders have a certain limit in volume, which leads to limited endurance of the car. Based on this, CN113324173A discloses a vehicle-mounted LNG cylinder, which includes a base; a bottle body, including an outer shell and an inner shell, the outer shell is connected to the base, and the inner shell is arranged inside the outer shell; the outer shell matches the shape of the inner shell; a pipeline assembly is connected to the bottle body, and the pipeline assembly is used to connect the interior of the inner shell and the external equipment of the bottle body; wherein the cross-sectional shape of the inner shell is elliptical. The above-mentioned vehicle-mounted LNG cylinder, for the existing back double-bottle setting, under the condition of the same length, cross-sectional width and cross-sectional height, that is, the size of the space for arranging LNG cylinders on the vehicle remains unchanged, the traditional double cylinder with a circular cross-sectional shape is changed to a single cylinder with an elliptical cross-sectional shape, which can not only effectively increase the volume of the bottle body and further increase the user's cruising range, but also achieve cost reduction and lightweight.

[0004] However, the vehicle-mounted LNG cylinder adopts an oval-shaped design, which causes stress concentration on the surface of the cylinder body, making the cylinder easily damaged due to the appearance of high stress points during use. Summary of the invention

[0005] In view of the problems existing in the prior art, an object of the present invention is to provide an elliptical LNG gas cylinder to solve the problem of stress concentration existing on the surface of the elliptical bottle body.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides an elliptical LNG gas cylinder, which comprises an inner liner and an outer liner;

[0008] The top and bottom ends of the outer liner are respectively reduced in diameter, and first reinforcement rings are respectively provided at the reduced diameter positions;

[0009] The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings;

[0010] The reduced diameter is a 4-6mm reduction in the inner diameter of the outer bladder;

[0011] The width of the reduced diameter is greater than or equal to the width of the first reinforcement ring.

[0012] The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical LNG gas cylinder by reducing the diameter of the outer liner of the elliptical gas cylinder to match the reinforcement ring set on the surface of the inner liner, avoids the formation of high stress concentration points, and thus improves the impact resistance of the gas cylinder. At the same time, the setting of the reinforcement ring can achieve the same reinforcement effect as the overall thickening of the bottle body, that is, while optimizing the stress distribution, the weight of the bottle body is reduced.

[0013] In the present invention, the elliptical gas cylinder is formed by moving the ellipse along the Z axis which is perpendicular to the plane where the XY plane is located, and the Z axis is the center line of the elliptical gas cylinder.

[0014] In the present invention, the shape of the reinforcement ring may be an annular ring or the like.

[0015] In the present invention, the bottom end of the outer liner is the side adjacent to the bottom of the outer liner, and the top end of the outer liner is the side adjacent to the top of the outer liner; the bottom end and top end of the inner liner can be deduced in the same manner.

[0016] In the present invention, the reinforcement ring can be provided by being integrally formed with the gas cylinder, or by being processed and formed and then being provided by secondary connection.

[0017] In the present invention, the design of the reinforcing component is different from the supporting member used for supporting the inner liner and the outer liner. It is not used to achieve a supporting effect, but is an additional component provided outside the supporting member.

[0018] In the present invention, the reduced diameter is a 4-6mm reduction in the inner diameter of the outer bladder, which is a radial distance, for example, it can be 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6mm, but is not limited to the listed values, and other values ​​not listed in this range are also applicable.

[0019] As a preferred technical solution of the present invention, the width of the reduced diameter is 40-60mm, for example, it can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm or 60mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0020] The width of the reduced diameter in the present invention is the width of the center line of the elliptical gas cylinder along the Z axis, excluding the width of the transition portion forming the reduced diameter structure. The width of the transition portion is as short as possible based on the limit of the reduction technology while ensuring that the requirements of the present invention are met.

[0021] As a preferred technical solution of the present invention, the width of the first reinforcement ring is 40-50mm, for example, it can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm or 50mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0022] Preferably, the width of the second reinforcement ring is 40-50 mm, for example, it can be 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm or 50 mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0023] As a preferred technical solution of the present invention, the thickness of the first reinforcement ring is equal to the thickness of the outer liner;

[0024] Preferably, the thickness of the second reinforcement ring is equal to the thickness of the inner liner.

[0025] As a preferred technical solution of the present invention, the thickness of the outer liner is 2.5-5mm, for example, it can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm or 5mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] Preferably, the thickness of the liner is 3.5-6mm, for example, it can be 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] As a preferred technical solution of the present invention, the length of the inner liner is 1420-1500mm, for example, it can be 1420mm, 1425mm, 1430mm, 1435mm, 1440mm, 1445mm, 1450mm, 1455mm, 1460mm, 1465mm, 1470mm, 1475mm, 1480mm, 1485mm, 1490mm, 1495mm or 1500mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0028] Preferably, the major axis of the ellipse in the inner container is 1200-1270 mm, and the minor axis is 600-620 mm.

[0029] In the present invention, the major axis of the ellipse in the inner liner is 1200-1270 mm, for example, it can be 1200 mm, 1202 mm, 1204 mm, 1206 mm, 1208 mm, 1210 mm, 1212 mm, 1214 mm, 1216 mm, 1218 mm, 1220 mm, 1222 mm, 1224 mm, 1226 mm, 1228 mm, 1230 mm, 1232 mm, 1234 mm m, 1236mm, 1238mm, 1240mm, 1242mm, 1244mm, 1246mm, 1248mm, 1250mm, 1252mm, 1254mm, 1256mm, 1258mm, 1260mm, 1262mm, 1264mm, 1266mm, 1268mm or 1270mm, but not limited to the listed values, other unlisted values ​​within the range are also applicable.

[0030] In the present invention, the minor axis length of the ellipse in the inner liner is 600-620mm, for example, it can be 602-620mm, for example, it can be 600mm, 601mm, 602mm, 603mm, 604mm, 605mm, 606mm, 607mm, 608mm, 609mm, 610mm, 611mm, 612mm, 613mm, 614mm, 615mm, 616mm, 617mm, 618mm, 619mm or 620mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0031] As a preferred technical solution of the present invention, the length of the outer bladder is 1670-1750mm, for example, it can be 1670mm, 1672mm, 1674mm, 1676mm, 1678mm, 1680mm, 1682mm, 1684mm, 1686mm, 1688mm, 1690mm, 1692mm, 1694mm, 1696mm, 1698mm, 1700mm, 1705mm, 1710mm, 1715mm, 1720mm, 1725mm, 1730mm, 1735mm, 1740mm, 1745mm or 1750mm, but is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0032] Preferably, the major axis of the ellipse in the outer bladder is 1250-1300 mm, and the minor axis is 630-650 mm.

[0033] In the present invention, the major axis of the ellipse in the outer liner is 1250-1300mm, for example, it can be 1250mm, 1252mm, 1254mm, 1256mm, 1258mm, 1260mm, 1262mm, 1264mm, 1266mm, 1268mm, 1270mm, 1272mm, 1274mm, 1276mm, 1278mm, 1280mm, 1282mm, 1284mm, 1286mm, 1288mm, 1290mm, 1292mm, 1294mm, 1296mm, 1298mm or 1300mm, but is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0034] In the present invention, the minor axis length of the ellipse in the outer liner is 630-650mm, for example, it can be 630mm, 632mm, 634mm, 636mm, 637mm, 638mm, 639mm, 640mm, 641mm, 642mm, 643mm, 644mm, 645mm, 646mm, 647mm, 648mm, 649mm or 650mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0035] As a preferred technical solution of the present invention, the material of the inner liner includes stainless steel.

[0036] Preferably, the material of the outer container includes stainless steel.

[0037] As a preferred technical solution of the present invention, the material of the first reinforcement ring is the same as the material of the outer liner;

[0038] Preferably, the material of the second reinforcement ring is the same as that of the inner liner.

[0039] As a preferred technical solution of the present invention, the oval LNG gas cylinder includes an inner liner and an outer liner;

[0040] The top and bottom ends of the outer liner are respectively reduced in diameter, and the first reinforcement rings are respectively provided at the reduced positions; the reduced diameter is reduced by 4-6 mm toward the inside of the outer liner; the width of the reduced diameter is ≥ the width of the first reinforcement ring; the width of the reduced diameter is 40-60 mm; the width of the first reinforcement ring is 40-50 mm; the thickness of the first reinforcement ring is equal to the thickness of the outer liner; the material of the first reinforcement ring is the same as that of the outer liner;

[0041] The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings; the width of the second reinforcement ring is 40-50 mm; the thickness of the second reinforcement ring is equal to the thickness of the inner container; the material of the second reinforcement ring is the same as that of the inner container;

[0042] The thickness of the outer liner is 2.5-5 mm; the length of the outer liner is 1670-1750 mm; the major axis of the ellipse in the outer liner is 1250-1300 mm, and the minor axis is 630-650 mm; the material of the outer liner includes stainless steel;

[0043] The thickness of the inner liner is 3.5-6 mm; the length of the inner liner is 1420-1500 mm; the major axis of the ellipse in the inner liner is 1200-1270 mm, and the minor axis is 600-620 mm; the material of the inner liner includes stainless steel.

[0044] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0045] The elliptical LNG gas cylinder provided by the present invention optimizes the distribution of surface stress of the elliptical gas cylinder while reducing weight by adopting a specific reinforcement component and a reduced diameter structure, which is beneficial to improving the impact resistance of the bottle body. The overall weight reduction of the bottle body is about 20-30% of the elliptical bottle body in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a top plan view of the bottle body in an embodiment of the present invention;

[0047] Figure 2 is a 3D schematic diagram of a reinforcement ring provided on the surface of the outer bladder in an embodiment of the present invention;

[0048] Figure 3 is a plan view of a reinforcement ring provided on the surface of an outer bladder in an embodiment of the present invention;

[0049] Figure 4 is a 3D schematic diagram of a reinforcement ring provided on the surface of the inner container in an embodiment of the present invention;

[0050] Figure 5 It is a plan view of a reinforcement ring provided on the surface of the inner container in an embodiment of the present invention.

[0051] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0052] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0053] This embodiment provides an elliptical LNG cylinder, such as Figure 1-5 As shown, the oval LNG gas cylinder includes an inner liner and an outer liner;

[0054] The top and bottom ends of the outer liner are respectively reduced in diameter, and the first reinforcement rings are respectively provided at the reduced positions; the width of the reduced diameter is ≥ the width of the first reinforcement ring; the width of the reduced diameter is 40-60 mm; the width of the first reinforcement ring is 40-50 mm; the thickness of the first reinforcement ring is equal to the thickness of the outer liner; the material of the first reinforcement ring is the same as that of the outer liner;

[0055] The top and bottom ends of the outer wall of the inner liner are respectively provided with second reinforcement rings; the width of the second reinforcement ring is 40-50 mm; the thickness of the second reinforcement ring is equal to the thickness of the inner liner; the reduced diameter is 4-6 mm reduced toward the inner liner; the material of the second reinforcement ring is the same as that of the inner liner;

[0056] Furthermore, in this example, the corresponding sizes and materials of the inner liner and the outer liner are exemplarily listed, such as

[0057] The thickness of the outer liner is 2.5-5mm; the length of the outer liner is 1670-1750mm; the major axis of the ellipse in the outer liner is 1250-1300mm, and the minor axis is 630-650mm; the material of the outer liner includes stainless steel; the thickness of the inner liner is 3.5-6mm; the length of the inner liner is 1420-1500mm; the major axis of the ellipse in the inner liner is 1200-1270mm, and the minor axis is 600-620mm; the material of the inner liner includes stainless steel, but is not limited to the listed ones. When having the reinforcing structure defined in the present invention, such as the design of the reduction and the reinforcing ring, other available materials or sizes can also be used to implement the scheme of the present invention.

[0058] The following are some examples:

[0059] Example 1

[0060] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0061] The top and bottom ends of the outer liner are respectively reduced in diameter, and the first reinforcing rings are respectively provided at the reduced positions; the reduced diameter is reduced by 5 mm toward the inside of the outer liner; the width of the reduced diameter is ≥ the width of the first reinforcing ring; the width of the reduced diameter is 50 mm; the width of the first reinforcing ring is 45 mm; the thickness of the first reinforcing ring is equal to the thickness of the outer liner; the material of the first reinforcing ring is the same as that of the outer liner;

[0062] The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings; the width of the second reinforcement ring is 45 mm; the thickness of the second reinforcement ring is equal to the thickness of the inner container; the material of the second reinforcement ring is the same as that of the inner container;

[0063] The thickness of the outer liner is 4mm; the length of the outer liner is 1690mm; the major axis of the ellipse in the outer liner is 1280mm, and the minor axis is 640mm; the material of the outer liner is stainless steel;

[0064] The thickness of the inner liner is 5 mm; the length of the inner liner is 1460 mm; the major axis of the ellipse in the inner liner is 1230 mm, and the minor axis is 610 mm; the material of the inner liner is stainless steel.

[0065] Example 2

[0066] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0067] The top and bottom ends of the outer liner are respectively reduced in diameter, and the first reinforcing rings are respectively provided at the reduced positions; the reduced diameter is reduced by 4 mm toward the inside of the outer liner; the width of the reduced diameter is ≥ the width of the first reinforcing ring; the width of the reduced diameter is 40 mm; the width of the first reinforcing ring is 40 mm; the thickness of the first reinforcing ring is equal to the thickness of the outer liner; the material of the first reinforcing ring is the same as that of the outer liner;

[0068] The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings; the width of the second reinforcement ring is 50 mm; the thickness of the second reinforcement ring is equal to the thickness of the inner container; the material of the second reinforcement ring is the same as that of the inner container;

[0069] The thickness of the outer liner is 5mm; the length of the outer liner is 1670mm; the major axis of the ellipse in the outer liner is 1250mm, and the minor axis is 650mm; the material of the outer liner is stainless steel;

[0070] The thickness of the inner liner is 6 mm; the length of the inner liner is 1500 mm; the major axis of the ellipse in the inner liner is 1200 mm, and the minor axis is 620 mm; the material of the inner liner is stainless steel.

[0071] Example 3

[0072] This embodiment provides an elliptical LNG cylinder.

[0073] The oval LNG cylinder includes an inner liner and an outer liner;

[0074] The top and bottom ends of the outer liner are respectively reduced in diameter, and the first reinforcing rings are respectively provided at the reduced positions; the reduced diameter is reduced by 6 mm toward the inside of the outer liner; the width of the reduced diameter is ≥ the width of the first reinforcing ring; the width of the reduced diameter is 60 mm; the width of the first reinforcing ring is 50 mm; the thickness of the first reinforcing ring is equal to the thickness of the outer liner; the material of the first reinforcing ring is the same as that of the outer liner;

[0075] The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings; the width of the second reinforcement ring is 40 mm; the thickness of the second reinforcement ring is equal to the thickness of the inner container; the material of the second reinforcement ring is the same as that of the inner container;

[0076] The thickness of the outer liner is 2.5 mm; the length of the outer liner is 1750 mm; the major axis of the ellipse in the outer liner is 1300 mm, and the minor axis is 630 mm; the material of the outer liner is stainless steel;

[0077] The thickness of the inner liner is 3.5 mm; the length of the inner liner is 1420 mm; the major axis of the ellipse in the inner liner is 1270 mm, and the minor axis is 600 mm; the material of the inner liner is stainless steel.

[0078] Comparative Example 1

[0079] The only difference from Example 1 is that the inner wall of the outer liner is not provided with the first reinforcement ring.

[0080] Comparative Example 2

[0081] The only difference from Example 1 is that the outer wall of the inner container is not provided with a second reinforcement ring.

[0082] Comparative Example 3

[0083] The only difference from Example 1 is that the inner container is also reduced in diameter with the same size parameters.

[0084] Comparative Example 4

[0085] The only difference from Example 1 is that the inner liner is reduced in diameter with the same size parameters, but the outer liner is not reduced in diameter.

[0086] The elliptical LNG gas cylinders provided in Examples 1-3 and Comparative Examples 1-4 were subjected to a drop test with a drop height of 10 meters. The stress and displacement received by the inner liner and the outer liner were tested. The specific test method was GB / T34510-2017. The results are detailed in Table 1.

[0087] Table 1

[0088] Outer bladder stress / MPa Inner tank stress / MPa Outer bladder displacement / % Inner tank displacement / % Example 1 334.5 234.5 2.24 2.12 Example 2 342.4 236.8 2.12 2.08 Example 3 335.6 220.6 2.34 1.98 Comparative Example 1 384.6 275.6 3.44 3.22 Comparative Example 2 368.5 256.8 3.54 3.13 Comparative Example 3 378.6 263.4 3.68 3.08 Comparative Example 4 394.5 287.6 3.41 3.01

[0089] The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical LNG gas cylinder by reducing the diameter of the outer liner of the elliptical gas cylinder to match the reinforcement ring set on the surface of the inner liner, avoids the formation of high stress concentration points, and thus improves the impact resistance of the gas cylinder. At the same time, the setting of the reinforcement ring can achieve the same reinforcement effect as the overall thickening of the bottle body, that is, while optimizing the stress distribution, the weight of the bottle body is reduced.

[0090] It is stated that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0091] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0092] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0093] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An elliptical LNG cylinder, characterized in that: The oval LNG cylinder includes an inner liner and an outer liner; The top and bottom ends of the outer liner are respectively reduced in diameter, and first reinforcement rings are respectively provided at the reduced diameter positions; The top and bottom ends of the outer wall of the inner container are respectively provided with second reinforcement rings; The reduced diameter is a 4-6mm reduction in the inner diameter of the outer bladder; The width of the reduced diameter is ≥ the width of the first reinforcement ring; the width of the reduced diameter is 40-60 mm; the width of the first reinforcement ring is 40-50 mm; and the width of the second reinforcement ring is 40-50 mm.

2. The oval LNG cylinder according to claim 1, characterized in that: The thickness of the first reinforcement ring is equal to the thickness of the outer liner.

3. The oval LNG cylinder according to claim 1, characterized in that: The thickness of the second reinforcement ring is equal to the thickness of the inner container.

4. The oval LNG cylinder according to claim 1, characterized in that: The thickness of the outer liner is 2.5-5 mm.

5. The oval LNG cylinder according to claim 1, characterized in that: The thickness of the inner liner is 3.5-6 mm.

6. The oval LNG cylinder according to claim 1, characterized in that: The length of the inner liner is 1420-1500 mm.

7. The oval LNG cylinder according to claim 1, characterized in that: The long axis of the ellipse in the inner container is 1200-1270 mm, and the short axis is 600-620 mm.

8. The oval LNG cylinder according to claim 1, characterized in that: The length of the outer bladder is 1670-1750 mm.

9. The oval LNG cylinder according to claim 1, characterized in that: The major axis of the ellipse in the outer bladder is 1250-1300 mm, and the minor axis is 630-650 mm.

10. The oval LNG cylinder according to claim 1, characterized in that: The material of the inner container includes stainless steel.

11. The oval LNG cylinder according to claim 1, characterized in that: The material of the outer liner includes stainless steel.

12. The oval LNG cylinder according to claim 1, characterized in that: The material of the first reinforcement ring is the same as that of the outer liner.

13. The oval LNG cylinder according to claim 1, characterized in that: The material of the second reinforcement ring is the same as that of the inner liner.

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