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 inner wall of the outer liner is provided with an elastic layer; the top, middle and bottom of the outer wall of the inner liner are respectively provided with reinforcement rings; the thickness of the elastic layer is 8-15mm. The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical bottle body by providing a specific elastic layer and reinforcement ring on the inner wall of the outer liner and the outer wall of the inner liner, significantly improves the stress dispersion ability of the bottle body, and is conducive to improving the impact resistance of the bottle body during actual use. At the same time, the introduction of the reinforcement structure can effectively reduce the wall thickness of the gas cylinder, thereby ensuring the use performance of the bottle body on the basis of achieving lightweight bottle body.

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 the LNG cylinder on the car remains unchanged, the traditional circular cross-sectional double cylinder is changed to a single cylinder with an elliptical cross-sectional shape, which can not only effectively increase the volume of the bottle body, 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 bottle body, resulting in low overall strength of the LNG cylinder and easy damage due to stress concentration points caused by collisions during use. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide an elliptical LNG gas cylinder to solve the stress concentration problem caused by the uneven surface stress distribution of the elliptical bottle body, so that the overall strength of the LNG gas cylinder is low and it is easy to generate stress concentration points and be damaged due to collision during use.

[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 inner wall of the outer liner is provided with an elastic layer;

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

[0010] The thickness of the elastic layer is 8-15 mm.

[0011] The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical bottle body by arranging a specific elastic layer and a reinforcement ring on the inner wall of the outer liner and the outer wall of the inner liner, significantly improves the stress dispersion capability of the bottle body, and is beneficial to improving the impact resistance of the bottle body during actual use. At the same time, the introduction of the reinforcement structure can effectively reduce the wall thickness of the gas cylinder, thereby ensuring the performance of the bottle body on the basis of achieving lightweight bottle body.

[0012] In the present invention, the elastic layer may be a rubber elastic layer, a material with high elasticity such as silicone.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] In the present invention, the shape of the reinforcement ring can be an annular ring, a serpentine ring, a broken line ring, etc.

[0017] 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.

[0018] In the present invention, the thickness of the elastic layer is 8-15 mm, for example, it can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm or 15 mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0019] As a preferred technical solution of the present invention, the elastic layer is provided with through holes distributed in an array.

[0020] Preferably, the spacing between the through holes is 10-15mm, for example, it can be 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm or 15mm, but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0021] In the present invention, the hole spacing is the distance between the center lines of adjacent holes. In principle, the larger the hole diameter, the larger the spacing value should be. However, this is not a limitation. To ensure that there is no interference between adjacent holes, the effect of the present invention can be achieved by selecting the hole spacing defined in the present invention.

[0022] Preferably, the equivalent circular diameter of the through hole is 8-12mm, for example, it can be 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm or 12mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0023] In the present invention, the shape of the hole can be a circular hole, a square hole, a polygonal hole, etc. When it is a circular hole, the equivalent circular diameter of the hole is the diameter of the circular hole. In other cases, the size of the hole can be reasonably converted according to the equivalent circular diameter.

[0024] As a preferred technical solution of the present invention, the width of the 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.

[0025] As a preferred technical solution of the present invention, the thickness of the reinforcement ring is equal to the thickness of the inner liner.

[0026] 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, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm or 5mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] 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, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm or 6mm, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] As a preferred technical solution of the present invention, the length of the inner liner is 1420-1510mm, for example, it can be 1420mm, 1425mm, 1430mm, 1435mm, 1440mm, 1445mm, 1450mm, 1455mm, 1460mm, 1465mm, 1470mm, 1475mm, 1480mm, 1485mm, 1490mm, 1495mm, 1500mm, 1505mm or 1510mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0029] Preferably, the major axis of the ellipse in the inner container is 1200-1255 mm, and the minor axis is 600-625 mm.

[0030] In the present invention, the major axis of the ellipse in the inner liner is 1200-1255mm, for example, it can be 1200mm, 1202mm, 1204mm, 1206mm, 1208mm, 1210mm, 1212mm, 1214mm, 1216mm, 1218mm, 1220mm, 1222mm, 1224mm, 1226mm, 1228mm, 1230mm, 1232mm, 1234mm, 1236mm, 1238mm, 1240mm, 1242mm, 1244mm, 1246mm, 1248mm, 1250mm, 1252mm, 1254mm or 1255mm, but is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0031] In the present invention, the minor axis length of the ellipse in the inner liner is 600-625mm, 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, 620mm, 620mm, 621mm, 622mm, 623mm, 624mm or 625mm, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0032] As a preferred technical solution of the present invention, the length of the outer bladder is 1650-1750mm, for example, it can be 1650mm, 1652mm, 1654mm, 1656mm, 1658mm, 1660mm, 1662mm, 1664mm, 1666mm, 1668mm, 1670mm, 1672mm, 1674mm, 1676mm, 1678mm, 1680mm, 1682mm, 16 84mm, 1686mm, 1688mm, 1690mm, 1692mm, 1694mm, 1696mm, 1698mm, 1700mm, 1705mm, 1710mm, 1715mm, 1720mm, 1725mm, 1730mm, 1735mm, 1740mm, 1745mm or 1750mm, but not limited to the listed values, other unlisted values ​​within the range are also applicable.

[0033] Preferably, the major axis of the ellipse in the outer bladder is 1270-1320 mm, and the minor axis is 625-655 mm.

[0034] In the present invention, the major axis of the ellipse in the outer liner is 1270-1320mm, for example, it can be 1270mm, 1272mm, 1274mm, 1276mm, 1278mm, 1280mm, 1282mm, 1284mm, 1286mm, 1288mm, 1290mm, 1292mm, 1294mm, 1296mm, 1298mm, 1300mm, 1302mm, 1304mm, 1306mm, 1308mm, 1310mm, 1312mm, 1314mm, 1316mm, 1318mm or 1320, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0035] In the present invention, the minor axis length of the ellipse in the outer liner is 625-655mm, for example, it can be 625mm, 626mm, 628mm, 630mm, 632mm, 634mm, 636mm, 637mm, 638mm, 639mm, 640mm, 641mm, 642mm, 643mm, 644mm, 645mm, 646mm, 647mm, 648mm, 649mm, 650mm, 652mm, 654mm or 655mm, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0036] As a preferred technical solution of the present invention, the material of the inner liner includes stainless steel.

[0037] Preferably, the material of the outer container includes stainless steel.

[0038] As a preferred technical solution of the present invention, the material of the 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 inner wall of the outer liner is provided with an elastic layer;

[0041] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0042] The thickness of the elastic layer is 8-15 mm; the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 10-15 mm; the equivalent circular diameter of the through holes is 8-12 mm;

[0043] The width of the reinforcement ring is 40-50 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 2.5-5 mm; the thickness of the inner liner is 3.5-6 mm;

[0044] The length of the inner liner is 1420-1510 mm; the major axis of the ellipse in the inner liner is 1200-1255 mm, and the minor axis is 600-625 mm;

[0045] The length of the outer liner is 1650-1750 mm; the major axis of the ellipse in the outer liner is 1270-1320 mm, and the minor axis is 625-655 mm;

[0046] The material of the inner liner includes stainless steel; the material of the outer liner includes stainless steel; the material of the reinforcement ring is the same as that of the inner liner.

[0047] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0048] The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical bottle body by strengthening the surface of the inner liner and the outer liner, and significantly improves the stress dispersion ability of the bottle body. At the same time, the introduction of the strengthening structure can effectively reduce the wall thickness of the gas cylinder, and the strength of the original bottle body can still be achieved on the basis of reducing the weight by 20-30%, effectively realizing the lightweighting of the bottle body and improving the impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a top plan view of the bottle body in an embodiment of the present invention;

[0050] Figure 2 is a 3D schematic diagram of an elastic layer disposed on the surface of an outer bladder in an embodiment of the present invention;

[0051] Figure 3 is a schematic plan view of an elastic layer disposed on the surface of an outer bladder in an embodiment of the present invention;

[0052] 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;

[0053] 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.

[0054] 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

[0055] 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:

[0056] 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;

[0057] The inner wall of the outer liner is provided with an elastic layer;

[0058] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0059] The thickness of the elastic layer is 8-15 mm.

[0060] The width of the reinforcement ring is 40-50 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the material of the reinforcement ring is the same as that of the inner liner;

[0061] Furthermore, the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 10-15 mm; the equivalent circular diameter of the through holes is 8-12 mm;

[0062] Furthermore, in this example, the corresponding sizes and materials of the inner liner and the outer liner are exemplarily listed, such as the length of the inner liner is 1420-1510mm, the major axis of the ellipse in the inner liner is 1200-1255mm, and the minor axis is 600-625mm; the length of the outer liner is 1650-1750mm, the major axis of the ellipse in the outer liner is 1270-1320mm, and the minor axis is 625-655mm; the thickness of the outer liner is 2.5-5mm; the thickness of the inner liner is 3.5-6mm; the material of the inner liner includes stainless steel; the material of the outer liner includes stainless steel; but it is not limited to the listed ones. When having the specific design specified in the present invention, other available materials or sizes can also be used to implement the scheme of the present invention.

[0063] The following are some examples:

[0064] Example 1

[0065] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0066] The inner wall of the outer liner is provided with an elastic layer (rubber elastic layer);

[0067] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0068] The thickness of the elastic layer is 12 mm;

[0069] The width of the reinforcement ring is 45 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 3 mm; the thickness of the inner liner is 5 mm;

[0070] The length of the inner liner is 1500 mm; the major axis of the ellipse in the inner liner is 1240 mm, and the minor axis is 610 mm;

[0071] The length of the outer liner is 1650 mm; the major axis of the ellipse in the outer liner is 1300 mm, and the minor axis is 630 mm;

[0072] The material of the inner liner is stainless steel; the material of the outer liner is stainless steel; the material of the reinforcement ring is the same as that of the inner liner.

[0073] Example 2

[0074] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0075] The inner wall of the outer liner is provided with an elastic layer;

[0076] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0077] The thickness of the elastic layer is 8 mm; the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 10 mm; the equivalent circular diameter of the through holes is 8 mm;

[0078] The width of the reinforcement ring is 40 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 5 mm; the thickness of the inner liner is 6 mm;

[0079] The length of the inner liner is 1420 mm; the major axis of the ellipse in the inner liner is 1255 mm, and the minor axis is 600 mm;

[0080] The length of the outer liner is 1750 mm; the major axis of the ellipse in the outer liner is 1320 mm, and the minor axis is 625 mm;

[0081] The material of the inner liner is stainless steel; the material of the outer liner is stainless steel; the material of the reinforcement ring is the same as that of the inner liner.

[0082] Example 3

[0083] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0084] The inner wall of the outer liner is provided with an elastic layer;

[0085] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0086] The thickness of the elastic layer is 15 mm; the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 15 mm; the equivalent circular diameter of the through holes is 12 mm;

[0087] The width of the reinforcement ring is 50 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 2.5 mm; the thickness of the inner liner is 3.5 mm;

[0088] The length of the inner liner is 1510 mm; the major axis of the ellipse in the inner liner is 1200 mm, and the minor axis is 625 mm;

[0089] The length of the outer liner is 1650 mm; the major axis of the ellipse in the outer liner is 1270 mm, and the minor axis is 655 mm;

[0090] The material of the inner liner is stainless steel; the material of the outer liner is stainless steel; the material of the reinforcement ring is the same as that of the inner liner.

[0091] Example 4

[0092] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0093] The inner wall of the outer liner is provided with an elastic layer;

[0094] The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings;

[0095] The thickness of the elastic layer is 10 mm; the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 12 mm; the equivalent circular diameter of the through holes is 10 mm;

[0096] The width of the reinforcement ring is 43mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 4mm; the thickness of the inner liner is 6mm;

[0097] The length of the inner liner is 1480 mm; the major axis of the ellipse in the inner liner is 1220 mm, and the minor axis is 620 mm;

[0098] The length of the outer liner is 1700 mm; the major axis of the ellipse in the outer liner is 1280 mm, and the minor axis is 640 mm;

[0099] The material of the inner liner is stainless steel; the material of the outer liner is stainless steel; the material of the reinforcement ring is the same as that of the inner liner.

[0100] Example 5

[0101] The only difference from Example 1 is that the elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 12 mm; and the equivalent circular diameter of the through holes is 10 mm.

[0102] Comparative Example 1

[0103] The only difference from Example 1 is that no elastic layer is provided on the inner wall of the outer liner.

[0104] Comparative Example 2

[0105] The only difference from Example 1 is that no reinforcement ring is provided on the outer wall of the inner container.

[0106] Comparative Example 3

[0107] The only difference from Example 1 is that the width of the reinforcement ring on the outer wall of the inner liner is equal to the thickness of the inner liner, that is, the width of the reinforcement ring is significantly reduced at this time and can be regarded as a reinforcement rib.

[0108] The elliptical LNG gas cylinders provided in Examples 1-5 and Comparative Examples 1-3 were subjected to a drop test at 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.

[0109] Table 1

[0110] Outer bladder stress / MPa Inner tank stress / MPa Outer bladder displacement / % Inner tank displacement / % Example 1 365.1 246.8 2.61 2.25 Example 2 355.4 234.5 2.48 2.14 Example 3 347.8 237.6 2.56 2.13 Example 4 328.6 224.8 1.94 1.36 Example 5 395.4 267.8 3.47 3.31 Comparative Example 1 384.6 274.8 4.45 2.95 Comparative Example 2 374.9 308.4 4.75 3.12 Comparative Example 3 367.9 254.7 5.67 3.14

[0111] The elliptical LNG gas cylinder provided by the present invention optimizes the stress distribution on the surface of the elliptical bottle body by arranging a specific elastic layer and a reinforcement ring on the inner wall of the outer liner and the outer wall of the inner liner, significantly improves the stress dispersion capability of the bottle body, and is beneficial to improving the impact resistance of the bottle body during actual use. At the same time, the introduction of the reinforcement structure can effectively reduce the wall thickness of the gas cylinder, thereby ensuring the performance of the bottle body on the basis of achieving lightweight bottle body.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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 inner wall of the outer liner is provided with an elastic layer; The top, middle and bottom ends of the outer wall of the inner container are respectively provided with reinforcement rings; The thickness of the elastic layer is 8-15 mm; The elastic layer is provided with through holes distributed in an array; the spacing between the through holes is 10-15 mm; the equivalent circular diameter of the through holes is 8-12 mm; The width of the reinforcement ring is 40-50 mm; the thickness of the reinforcement ring is equal to the thickness of the inner liner; the thickness of the outer liner is 2.5-5 mm; and the thickness of the inner liner is 3.5-6 mm.

2. The oval LNG cylinder according to claim 1, characterized in that: The length of the inner liner is 1420-1510 mm.

3. The oval LNG cylinder according to claim 1, characterized in that: The major axis of the ellipse in the inner container is 1200-1255 mm, and the minor axis is 600-625 mm.

4. The oval LNG cylinder according to claim 1, characterized in that: The length of the outer bladder is 1650-1750 mm.

5. The oval LNG cylinder according to claim 1, characterized in that: The major axis of the ellipse in the outer bladder is 1270-1320 mm, and the minor axis is 625-655 mm.

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

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

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

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