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 at least two reinforcement rings; the outer wall of the inner liner is provided with at least two reinforcement rings; the number of reinforcement rings on the inner wall of the outer liner is different from the number of reinforcement rings on the outer wall of the inner liner, wherein the reinforcement rings with a small number are in a wavy shape, and the reinforcement rings with a large number are in a circular ring shape. The elliptical LNG gas cylinder provided by the present invention can achieve secondary optimization of the stress on the surface of the gas cylinder by setting differentiated reinforcement rings for the inner liner and the outer liner, and strengthening the distribution of stress by using the reinforcement rings with a small number in a wavy shape, and ensure that no high stress concentration points will appear during use, thereby ensuring that the bottle body has a high impact resistance.

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 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 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 problems of uneven stress distribution on the surface of the bottle body and slow stress redistribution when encountering a collision, resulting in high stress concentration points.

[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 at least two reinforcement rings;

[0009] The outer wall of the inner liner is provided with at least two reinforcement rings;

[0010] The number of reinforcement rings on the inner wall of the outer liner is different from the number of reinforcement rings on the outer wall of the inner liner, wherein the reinforcement rings with a smaller number are wavy in shape, and the reinforcement rings with a larger number are circular in shape.

[0011] The elliptical LNG gas cylinder provided by the present invention has differentiated reinforcement ring settings for the inner liner and the outer liner, and the shape of the reinforcement rings with a small number is wavy to strengthen the distribution of stress, so that the stress on the surface of the gas cylinder can be secondary optimized and it can be ensured that no high stress concentration points will appear during use, thereby ensuring that the bottle body has a high impact resistance.

[0012] In the present invention, the total length of the wave crest and trough is the width of the reinforcement ring, wherein the length of the wave crest and the length of the wave trough can be selected according to actual conditions, such as being equal in length, or the length of the wave crest: the length of the wave trough is 1:2, the length of the wave crest: the length of the wave trough is 2:1, etc.

[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 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.

[0015] 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.

[0016] 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.

[0017] As a preferred technical solution of the present invention, the reinforcement rings on the inner wall of the outer liner are evenly distributed on the inner wall.

[0018] As a preferred technical solution of the present invention, the reinforcement rings on the outer wall of the inner container are evenly distributed on the inner wall.

[0019] As a preferred technical solution of the present invention, the width of the reinforcement ring is 35-40mm, for example, it can be 35mm, 35.2mm, 35.4mm, 35.6mm, 35.8mm, 36mm, 36.2mm, 36.4mm, 36.6mm, 36.8mm, 37mm, 37.2mm, 37.4mm, 37.6mm, 37.8mm, 38mm, 38.2mm, 38.4mm, 38.6mm, 38.8mm, 39mm, 39.2mm, 39.4mm, 39.6mm, 39.8mm or 40mm, but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0020] Preferably, the thickness of the reinforcement ring is 2.5-4.5 mm, for example, it can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm or 4.5 mm, but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0021] As a preferred technical solution of the present invention, the thickness of the outer liner is 2.5-4mm, 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 or 4mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] 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, 4.7mm, 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.

[0023] 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.

[0024] Preferably, the major axis of the ellipse in the inner container is 1200-1280 mm, and the minor axis is 600-620 mm.

[0025] In the present invention, the major axis of the ellipse in the inner liner is 1200-1280mm, 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, 1255mm, 1260mm, 1265mm, 1270mm, 1275mm or 1280mm, but is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0026] In the present invention, the minor axis length of the ellipse in the inner liner is 600-620mm, for example, it can be 600mm, 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.

[0027] As a preferred technical solution of the present invention, the length of the outer bladder is 1650-1700mm, for example, it can be 1650mm, 1655mm, 1660mm, 1650mm, 1670mm, 1672mm, 1674mm, 1676mm, 1678mm, 1680mm, 1682mm, 1684mm, 1686mm, 1688mm, 1690mm, 1692mm, 1694mm, 1696mm, 1698mm or 1700mm, but is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0028] Preferably, the major axis of the ellipse in the outer bladder is 1250-1300 mm, and the minor axis is 610-650 mm.

[0029] In the present invention, the major axis of the ellipse in the outer liner is 1250-1300mm, for example, it can be 1250mm, 1255mm, 1260mm, 1265mm, 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 also applicable.

[0030] In the present invention, the minor axis length of the ellipse in the outer liner is 610-650mm, for example, it can be 610mm, 615mm, 620mm, 625mm, 630mm, 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.

[0031] As a preferred technical solution of the present invention, the material of the inner liner includes stainless steel.

[0032] Preferably, the material of the outer container includes stainless steel.

[0033] As a preferred technical solution of the present invention, the material of the reinforcement ring is the same as that of the outer liner;

[0034] As a preferred technical solution of the present invention, the oval LNG gas cylinder includes an inner liner and an outer liner;

[0035] The inner wall of the outer liner is provided with at least two reinforcement rings;

[0036] The outer wall of the inner liner is provided with at least two reinforcement rings;

[0037] The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the reinforcing rings with a smaller number are wavy in shape; the reinforcing rings on the inner wall of the outer liner are evenly distributed on the inner wall; the reinforcing rings on the outer wall of the inner liner are evenly distributed on the inner wall; the width of the reinforcing ring is 35-40 mm; the thickness of the reinforcing ring is 2.5-4.5 mm;

[0038] The thickness of the outer liner is 2.5-4 mm; the length of the outer liner is 1650-1700 mm; the major axis of the ellipse in the outer liner is 1250-1300 mm, and the minor axis is 610-650 mm;

[0039] 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 1200-1280 mm, and the minor axis is 600-620 mm;

[0040] 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 outer liner.

[0041] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0042] The elliptical LNG gas cylinder provided by the present invention achieves weight reduction of the bottle body by arranging specially designed reinforcement rings on the surfaces of the inner liner and the outer liner, while ensuring that the bottle body has good impact resistance, that is, the gas cylinder is ensured to have excellent performance on the basis of weight reduction; by adopting the design of the present invention, the gas cylinder can be reduced by 20-35% on the basis of ensuring the original strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a top plan view of the bottle body in an embodiment of the present invention;

[0044] Figure 2 is a 3D schematic diagram of a reinforcement ring provided on the bottle body in an embodiment of the present invention;

[0045] 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;

[0046] 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;

[0047] Figure 5 is a schematic plan view of a reinforcement ring provided on the surface of an inner container in an embodiment of the present invention;

[0048] Figure 6It is a schematic diagram showing that a small number of reinforcement rings in an embodiment of the present invention are wavy in shape.

[0049] 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

[0050] 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:

[0051] This embodiment provides an elliptical LNG cylinder, such as Figure 1-6 The oval LNG gas cylinder shown includes an inner liner and an outer liner;

[0052] The inner wall of the outer liner is provided with at least two reinforcement rings;

[0053] The outer wall of the inner liner is provided with at least two reinforcement rings;

[0054] The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the reinforcing rings with a smaller number are in a wavy shape, and the reinforcing rings with a larger number are in a circular shape; the reinforcing rings on the inner wall of the outer liner are evenly distributed on the inner wall; the reinforcing rings on the outer wall of the inner liner are evenly distributed on the inner wall; the width of the reinforcing ring is 35-40mm; the thickness of the reinforcing ring is 2.5-4.5mm; the material of the reinforcing ring is the same as that of the outer liner;

[0055] Furthermore, in this example, the corresponding sizes and materials of the inner liner and the outer liner are listed by way of example, such as the thickness of the outer liner is 2.5-4mm; the length of the outer liner is 1650-1700mm; the major axis of the ellipse in the outer liner is 1250-1300mm, and the minor axis is 610-650mm; 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 1200-1280mm, and the minor axis is 600-620mm; the material of the inner liner includes stainless steel; the material of the outer liner includes stainless steel; but is not limited to those listed. When the design of the reinforcement ring defined in the present invention is provided, other available materials or sizes may also be used to implement the scheme of the present invention.

[0056] The following are some examples:

[0057] Example 1

[0058] This embodiment provides an elliptical LNG gas cylinder, which includes an inner liner and an outer liner;

[0059] The inner wall of the outer liner is provided with two reinforcement rings, and the shape of the reinforcement rings is wavy;

[0060] The outer wall of the inner container is provided with three reinforcement rings, each of which is in the shape of a circular ring;

[0061] The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the heights of the wave crests and troughs of the wave shape are the same; the reinforcing rings on the inner wall of the outer liner are evenly distributed on the inner wall; the reinforcing rings on the outer wall of the inner liner are evenly distributed on the inner wall; the width of the reinforcing ring is 40 mm; the thickness of the reinforcing ring is 3 mm;

[0062] The thickness of the outer liner is 3 mm; the length of the outer liner is 1680 mm; the major axis of the ellipse in the outer liner is 1280 mm, and the minor axis is 630 mm;

[0063] The thickness of the inner liner is 4 mm; the length of the inner liner is 1450 mm; the major axis of the ellipse in the inner liner is 1240 mm, and the minor axis is 610 mm;

[0064] 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 outer liner.

[0065] Example 2

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

[0067] The inner wall of the outer liner is provided with 4 reinforcement rings, and the reinforcement rings are in the shape of circular rings;

[0068] The outer wall of the inner container is provided with three reinforcement rings, and the shape of the reinforcement rings is wavy;

[0069] The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the heights of the wave crests and troughs of the wave shape are the same; the reinforcing rings on the inner wall of the outer liner are evenly distributed on the inner wall; the reinforcing rings on the outer wall of the inner liner are evenly distributed on the inner wall; the width of the reinforcing ring is 35 mm; the thickness of the reinforcing ring is 2.5 mm;

[0070] The thickness of the outer liner is 4 mm; the length of the outer liner is 1700 mm; the major axis of the ellipse in the outer liner is 1300 mm, and the minor axis is 610 mm;

[0071] The thickness of the inner liner is 6 mm; the length of the inner liner is 1420 mm; the major axis of the ellipse in the inner liner is 1280 mm, and the minor axis is 600 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 outer liner.

[0073] Example 3

[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 three reinforcement rings, each of which is in the shape of a circular ring;

[0076] The outer wall of the inner container is provided with two reinforcement rings, and the reinforcement rings are wavy in shape;

[0077] The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the heights of the wave crests and troughs of the wave shape are the same; the reinforcing rings on the inner wall of the outer liner are evenly distributed on the inner wall; the reinforcing rings on the outer wall of the inner liner are evenly distributed on the inner wall; the width of the reinforcing ring is 38 mm; the thickness of the reinforcing ring is 4.5 mm;

[0078] The thickness of the outer liner is 2.5 mm; the length of the outer liner is 1650 mm; the major axis of the ellipse in the outer liner is 1250 mm, and the minor axis is 650 mm;

[0079] The thickness of the inner liner is 3.5 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;

[0080] 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 outer liner.

[0081] Comparative Example 1

[0082] The only difference from Example 1 is that the reinforcing ring on the inner wall of the outer bladder is in the shape of a circular ring.

[0083] Comparative Example 2

[0084] The only difference from Example 1 is that there are two reinforcement rings on the outer wall of the inner container.

[0085] The elliptical LNG gas cylinders provided in Examples 1-3 and Comparative Examples 1-2 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.

[0086] Table 1

[0087] Outer bladder stress / MPa Inner tank stress / MPa Outer bladder displacement / % Inner tank displacement / % Example 1 368.2 252.3 2.47 2.32 Example 2 359.3 241.9 2.45 2.21 Example 3 352.1 243.8 2.58 2.17 Comparative Example 1 402.1 268.2 3.54 3.42 Comparative Example 2 394.5 272.6 4.57 3.02

[0088] Through the results of the above embodiments and comparative examples, the elliptical LNG gas cylinder provided by the present invention, by setting differentiated reinforcement rings for the inner liner and the outer liner, and strengthening the stress distribution by using a small number of reinforcement rings in a wavy shape, can achieve secondary optimization of the stress on the surface of the gas cylinder and ensure that no high stress concentration points will appear during use, thereby ensuring that the bottle body has a high impact resistance.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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 at least two reinforcement rings; The outer wall of the inner liner is provided with at least two reinforcement rings; The number of reinforcing rings on the inner wall of the outer liner is different from the number of reinforcing rings on the outer wall of the inner liner, wherein the reinforcing rings with a smaller number are wavy in shape, and the reinforcing rings with a larger number are circular in shape; The reinforcement ring is distributed along the axial direction of the oval LNG cylinder; The concave-convex wave structure of the wave-shaped reinforcement ring is composed of wave crests and wave troughs to form a minimum repeating unit, and the wave crests and wave troughs are arranged at intervals along the axial direction of the gas cylinder.

2. The oval LNG cylinder according to claim 1, characterized in that: The reinforcement rings on the inner wall of the outer bladder are evenly distributed on the inner wall.

3. The oval LNG cylinder according to claim 1, characterized in that: The reinforcement rings on the outer wall of the inner container are evenly distributed on the inner wall.

4. The oval LNG cylinder according to claim 1, characterized in that: The width of the reinforcement ring is 35-40 mm.

5. The oval LNG cylinder according to claim 1, characterized in that: The thickness of the reinforcement ring is 2.5-4.5 mm.

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

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

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

9. The oval LNG cylinder according to claim 1, characterized in that: The long axis of the ellipse in the inner container is 1200-1280 mm, and the short axis is 600-620 mm.

10. The oval LNG cylinder according to claim 1, characterized in that: The length of the outer bladder is 1650-1700 mm.

11. 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 610-650 mm.

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

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

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

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