A LNG gas cylinder

Abstract

The present invention provides an LNG gas cylinder, the gas cylinder comprises an inner liner and an outer liner, the inner wall of the outer liner is provided with 2 to 3 first reinforcement rings, the first reinforcement rings are fixedly connected to the inner wall of the outer liner; the outer wall of the inner liner is provided with 2 to 3 second reinforcement rings, the second reinforcement rings are fixedly connected to the outer wall of the inner liner; the number of reinforcement rings on the inner wall of the outer liner and the outer wall of the inner liner is not equal, when the number of the first reinforcement ring or the second reinforcement ring is 2, the side surface of the first reinforcement ring or the second reinforcement ring has a concave-convex wave structure. The LNG gas cylinder further reduces the number of reinforcement rings used by the wave-shaped reinforcement ring, further reduces the weight of the LNG gas cylinder while ensuring the strength of the LNG gas cylinder.

Description

Technical Field

[0001] The invention belongs to the field of gas cylinder design and relates to an LNG gas cylinder. Background Art

[0002] LNG—Liquefied Natural Gas, is formed by liquefying natural gas at -162℃. Its main component is alkane (CH4). It is recognized as one of the clean energy sources in the world. Its pollution to the environment is far less than that of oil and coal. Density 430-470 (kg / m 3 ), which is three times that of CNG. It has a large storage capacity and a long driving range. Taking the current mainstream 1000L gas cylinder as an example, it can last for 1800-2500 kilometers. It has a price advantage over diesel and is currently favored by long-distance logistics vehicles.

[0003] From 2015 to 2019, sales of natural gas commercial vehicles increased from 22,285 units to 87,869 units, with an average annual compound growth rate of 40.91%. With the gradual introduction of industrial policies and the improvement of natural gas infrastructure construction, the supply capacity of natural gas has gradually increased, the supply and demand relationship of natural gas has tended to be stable, and the market prospects for natural gas vehicles are optimistic.

[0004] However, the existing LNG cylinders are heavy and do not meet the requirements of today's lightweight technology. How to reduce the weight of the LNG cylinders while ensuring the strength of the LNG cylinders while ensuring the volume of the LNG cylinders is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides an LNG gas cylinder, which further reduces the number of reinforcement rings used by the wave-shaped reinforcement ring, further reduces the weight of the LNG gas cylinder while ensuring the strength of the LNG gas cylinder.

[0006] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0007] The present invention provides an LNG gas cylinder, which includes an inner liner and an outer liner, wherein the inner wall of the outer liner is provided with 2 to 3 first reinforcement rings, and the first reinforcement rings are fixedly connected to the inner wall of the outer liner; the outer wall of the inner liner is provided with 2 to 3 second reinforcement rings, and the second reinforcement rings are fixedly connected to the outer wall of the inner liner; the number of reinforcement rings on the inner wall of the outer liner and the outer wall of the inner liner is not equal, and when the number of the first reinforcement rings or the second reinforcement rings is 2, the side surface of the first reinforcement ring or the second reinforcement ring has a concave and convex wave structure.

[0008] The number of reinforcement rings may be 3, 4, 5 or 6, etc., but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0009] In the present invention, the reinforcement ring with a concave-convex wave structure on the side can be set only at the two ends of the inner liner and the outer liner to achieve an excellent stress dispersion effect. The reason is that the existence of the reinforcement ring itself can play a good role in reinforcing the strength of the inner and outer liners of the gas cylinder. The wavy reinforcement ring can effectively improve the stress concentration phenomenon compared with the ordinary rectangular circular reinforcement ring.

[0010] As a preferred technical solution of the present invention, the concave-convex wave structure is a regular wave structure with wave crests and wave troughs constituting the minimum repeating unit, wherein the minimum repeating unit constituting the wave crests and wave troughs is a ring formed by the minimum repeating unit constituting adjacent wave crests and wave troughs.

[0011] In the present invention, the size of the minimum repeating unit of the concave-convex wave structure consisting of wave crests and wave troughs can be specifically adjusted according to the material and size of the LNG cylinder, and is not specifically limited here.

[0012] As a preferred technical solution of the present invention, when the number of the first reinforcement rings or the second reinforcement rings is 2, the first reinforcement rings or the second reinforcement rings are arranged on the two top ends of the inner wall of the outer liner or the outer wall of the inner liner.

[0013] As a preferred technical solution of the present invention, when the number of the first reinforcement rings or the second reinforcement rings is 3, the first reinforcement rings or the second reinforcement rings are arranged at two top ends and a center position of the inner wall of the outer liner or the outer wall of the inner liner.

[0014] As a preferred technical solution of the present invention, the thickness of the first reinforcement ring is 3.5-4.5 mm, such as 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 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 unlisted values ​​within the numerical range are also applicable.

[0015] Preferably, the width of the first reinforcement ring is 35-45 mm, such as 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm or 45 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] As a preferred technical solution of the present invention, the thickness of the second reinforcement ring is 3.5-4.5 mm, such as 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 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 unlisted values ​​within the numerical range are also applicable.

[0017] Preferably, the width of the second reinforcement ring is 35-45 mm, such as 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm or 45 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] As a preferred technical solution of the present invention, the thickness of the outer liner is 2.5-3.5 mm, such as 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm or 3.5 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] Preferably, the length of the outer bladder is 1650-1700 mm, such as 1650 mm, 1660 mm, 1670 mm, 1680 mm, 1690 mm or 1700 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the inner diameter of the outer liner is 900-910mm, such as 900mm, 901mm, 902mm, 903mm, 904mm, 905mm, 906mm, 907mm, 908mm, 909mm or 910mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] As a preferred technical solution of the present invention, the thickness of the inner liner is 3.5-4.5 mm, such as 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 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 unlisted values ​​within the numerical range are also applicable.

[0022] Preferably, the length of the inner liner is 1400-1450 mm, such as 1400 mm, 1410 mm, 1420 mm, 1430 mm, 1440 mm or 1450 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] Preferably, the inner diameter of the liner is 840-850 mm, such as 840 mm, 841 mm, 842 mm, 843 mm, 844 mm, 845 mm, 846 mm, 847 mm, 848 mm, 849 mm or 850 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] As a preferred technical solution of the present invention, the material of the outer liner and the outer liner are independently stainless steel.

[0025] As a preferred technical solution of the present invention, the materials of the first reinforcement ring and the second reinforcement ring are independently stainless steel.

[0026] In the present invention, the stainless steel material of the outer liner, the inner liner, the first reinforcement ring and the second reinforcement ring is preferably 304 stainless steel.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The present invention provides an LNG gas cylinder, which is about 29% lighter than the original LNG gas cylinder, and further reduces the number of reinforcement rings used through the wavy reinforcement ring, thereby further reducing the weight of the LNG gas cylinder while ensuring the strength of the LNG gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of the outer liner (three reinforcement rings) of the LNG gas cylinder provided in a specific embodiment of the present invention;

[0030] Figure 2 A cross-sectional view of an outer liner (three reinforcement rings) of an LNG gas cylinder provided in a specific embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the structure of the liner (three reinforcement rings) of the LNG gas cylinder provided in a specific embodiment of the present invention;

[0032] Figure 4 A cross-sectional view of the inner liner (three reinforcement rings) of the LNG gas cylinder provided in a specific embodiment of the present invention;

[0033] Figure 5 A top view of an outer liner (two reinforcement rings) or an inner liner (two reinforcement rings) of an LNG gas cylinder provided in a specific embodiment of the present invention.

[0034] 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

[0035] 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:

[0036] Example 1

[0037] This embodiment provides an LNG gas cylinder, such as Figure 3-5As shown, the gas cylinder includes an inner liner and an outer liner, the outer liner has a thickness of 3mm, a length of 1670mm, and an inner diameter of 904mm, the inner liner has a thickness of 4mm, a length of 1430mm, and an inner diameter of 842mm; a first reinforcement ring is respectively arranged at the two top ends of the inner wall of the outer liner, and the side surface of the first reinforcement ring has a concave and convex wave structure; a second reinforcement ring is respectively arranged at the two top ends and the middle of the outer wall of the inner liner; the first reinforcement ring has a thickness of 4mm and a width of 40mm; the second reinforcement ring has a thickness of 4mm and a width of 40mm.

[0038] Example 2

[0039] The present embodiment provides an LNG gas cylinder, which includes an inner liner and an outer liner. The outer liner has a thickness of 2.5 mm, a length of 1650 mm, and an inner diameter of 900 mm. The inner liner has a thickness of 3.5 mm, a length of 1400 mm, and an inner diameter of 840 mm. A first reinforcement ring is provided at each of the two top ends of the inner wall of the outer liner, and the side surface of the first reinforcement ring has a concave and convex wave structure. A second reinforcement ring is provided at each of the two top ends and the middle of the outer wall of the inner liner. The first reinforcement ring has a thickness of 3.5 mm and a width of 35 mm. The second reinforcement ring has a thickness of 3.5 mm and a width of 35 mm.

[0040] Example 3

[0041] The present embodiment provides an LNG gas cylinder, which includes an inner liner and an outer liner. The outer liner has a thickness of 3.5 mm, a length of 1700 mm, and an inner diameter of 910 mm. The inner liner has a thickness of 4.5 mm, a length of 1450 mm, and an inner diameter of 850 mm. The inner wall of the outer liner is provided with three first reinforcement rings, and the outer wall of the inner liner is provided with three second reinforcement rings. The first reinforcement rings are independently provided at both ends and the center of the inner wall of the outer liner, and the second reinforcement rings are independently provided at both ends and the center of the outer wall of the inner liner. The thickness of the reinforcement ring of the inner wall of the outer liner is 3.5 mm, and the width is 45 mm. The thickness of the reinforcement ring of the outer wall of the inner liner is 3.5 mm, and the width is 45 mm.

[0042] Example 4

[0043] This embodiment provides an LNG gas cylinder, such as Figure 1 , 2As shown in Figure 5, the gas cylinder includes an inner liner and an outer liner, the outer liner has a thickness of 3mm, a length of 1670mm, and an inner diameter of 904mm, the inner liner has a thickness of 4mm, a length of 1430mm, and an inner diameter of 842mm; a first reinforcement ring is provided at each of the two top ends and the middle of the inner wall of the outer liner; a second reinforcement ring is provided at each of the two top ends of the outer wall of the inner liner, and the side surface of the second reinforcement ring has a concave and convex wave structure; the first reinforcement ring has a thickness of 4mm and a width of 40mm; the second reinforcement ring has a thickness of 4mm and a width of 40mm.

[0044] Example 5

[0045] The present embodiment provides an LNG gas cylinder, which includes an inner liner and an outer liner. The outer liner has a thickness of 2.5 mm, a length of 1650 mm, and an inner diameter of 900 mm. The inner liner has a thickness of 3.5 mm, a length of 1400 mm, and an inner diameter of 840 mm. A first reinforcement ring is provided at each of the two top ends and the middle of the inner wall of the outer liner. A second reinforcement ring is provided at each of the two top ends of the outer wall of the inner liner, and the side surface of the second reinforcement ring has a concave and convex wave structure. The first reinforcement ring has a thickness of 3.5 mm and a width of 35 mm. The second reinforcement ring has a thickness of 3.5 mm and a width of 35 mm.

[0046] Example 6

[0047] The present embodiment provides an LNG gas cylinder, which includes an inner liner and an outer liner. The outer liner has a thickness of 3.5 mm, a length of 1700 mm, and an inner diameter of 910 mm. The inner liner has a thickness of 4.5 mm, a length of 1450 mm, and an inner diameter of 850 mm. A first reinforcement ring is provided at each of the two top ends and the middle of the inner wall of the outer liner. A second reinforcement ring is provided at each of the two top ends of the outer wall of the inner liner, and the side surface of the second reinforcement ring has a concave and convex wave structure. The thickness of the reinforcement ring of the inner wall of the outer liner is 3.5 mm, and the width is 45 mm. The thickness of the reinforcement ring of the outer wall of the inner liner is 3.5 mm, and the width is 45 mm.

[0048] Comparative Example 1

[0049] This comparative example provides an LNG gas cylinder, except that the side surface of the first reinforcement ring does not have a concave-convex wave structure (ie, a conventional circular ring shape), the other conditions are the same as those of Example 1.

[0050] Comparative Example 2

[0051] This comparative example provides an LNG gas cylinder, except that the side surface of the second reinforcement ring does not have a concave-convex wave structure (ie, a conventional circular ring shape), the other conditions are the same as those of Example 4.

[0052] In Examples 1-5 and Comparative Example 1-2, the cross-section of the reinforcement ring is rectangular, and the material of the inner liner, the outer liner, the first reinforcement ring and the second reinforcement ring is 304 stainless steel.

[0053] A drop test was performed on an LNG gas cylinder provided in Example 1-5 and Comparative Example 1-2. The drop height was 10 meters. The stress and displacement of the inner liner and the outer liner were tested. The specific test method was GB / T34510-2017. The results are shown in Table 1.

[0054] Table 1

[0055] Outer bladder stress / MPa Inner tank stress / MPa Outer bladder displacement / % Inner tank displacement / % Example 1 492MPa 457MPa 7.42％ 5.50％ Example 2 512MPa 488MPa 8.10％ 9.35％ Example 3 470MPa 438MPa 6.65％ 5.27％ Example 4 486MPa 466MPa 7.33％ 5.56％ Example 5 512MPa 490MPa 8.11％ 9.38％ Example 6 465MPa 445MPa 6.61％ 5.35％ Comparative Example 1 500MPa 458MPa 7.52％ 5.52％ Comparative Example 2 489MPa 477MPa 7.36％ 5.67％

[0056] It can be seen from the test results in Table 1 that the drop test results of the LNG cylinders provided in Examples 1-6 of the present application are excellent, indicating that the LNG cylinders have high strength. Comparative Examples 1 and 2 replace the reinforcing rings with the concave-convex wave structure on the side with ordinary annular reinforcing rings, and the drop test results are lower than those of Examples 1 and 4.

[0057] The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed structural features, that is, it does not mean that the present invention must rely on the above-mentioned 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.

[0058] 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.

[0059] 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.

[0060] 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 LNG cylinder, characterized in that: The gas cylinder comprises an inner liner and an outer liner, the inner wall of the outer liner is provided with 2 to 3 first reinforcement rings, and the first reinforcement rings are fixedly connected to the inner wall of the outer liner; the outer wall of the inner liner is provided with 2 to 3 second reinforcement rings, and the second reinforcement rings are fixedly connected to the outer wall of the inner liner; the number of reinforcement rings on the inner wall of the outer liner and the outer wall of the inner liner is not equal, when the number of the first reinforcement rings or the second reinforcement rings is 2, the side surface of the first reinforcement ring or the second reinforcement ring has a concave-convex wave structure, and the concave-convex wave structure is a regular wave structure with a minimum repeating unit composed of wave crests and wave troughs, and the wave crests and wave troughs are arranged at intervals along the axial direction of the gas cylinder; When the number of the first reinforcement ring or the second reinforcement ring is 2, the first reinforcement ring or the second reinforcement ring is arranged on the inner wall of the outer liner or the two top ends of the outer wall of the inner liner; When the number of the first reinforcement rings or the second reinforcement rings is 3, the first reinforcement rings or the second reinforcement rings are arranged at two top ends and a center position of the inner wall of the outer liner or the outer wall of the inner liner.

2. The LNG cylinder according to claim 1, characterized in that: The thickness of the first reinforcement ring is 3.5-4.5 mm.

3. The LNG cylinder according to claim 1, characterized in that: The width of the reinforcement ring on the inner wall of the outer liner is 35-45 mm.

4. The LNG cylinder according to claim 1, characterized in that: The thickness of the second reinforcement ring is 3.5-4.5 mm.

5. The LNG cylinder according to claim 1, characterized in that: The width of the reinforcement ring on the outer wall of the inner liner is 35-45 mm.

6. The LNG cylinder according to claim 1, characterized in that: The thickness of the outer liner is 2.5-3.5 mm, the length of the outer liner is 1650-1700 mm, and the inner diameter of the outer liner is 900-910 mm.

7. The LNG cylinder according to claim 1, characterized in that: The thickness of the inner liner is 3.5-4.5 mm, the length of the inner liner is 1400-1450 mm, and the inner diameter of the inner liner is 840-850 mm.

8. The LNG cylinder according to claim 1, characterized in that: The materials of the outer liner and the outer liner are independently stainless steel.

9. The LNG cylinder according to claim 1, characterized in that: The first reinforcement ring and the second reinforcement ring are independently made of stainless steel.

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