A LNG gas cylinder

Abstract

The present invention provides an LNG gas cylinder, wherein the outer wall of the outer liner is provided with concave reinforcing ribs, and the outer wall of the inner liner is provided with convex reinforcing ribs; the reinforcing ribs of the inner wall of the outer liner include at least 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG gas cylinder, at least 4 arc-shaped reinforcing ribs are provided between adjacent horizontal reinforcing ribs, the two ends of the arc-shaped reinforcing ribs are independently connected to the vertical reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG gas cylinder. While reducing the weight of the LNG gas cylinder, the strength of the LNG gas cylinder is ensured by adopting a special combination of horizontal reinforcing ribs and arc-shaped reinforcing ribs on the outer wall of the outer liner in combination with the setting of the annular reinforcing ribs of the inner liner.

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 one of the world's recognized clean energy sources, and its pollution to the environment is far less than that of oil and coal. Its density is 430-470 (kg / m³), 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 travel 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 reduces the weight of the LNG gas cylinder while ensuring the strength of the LNG gas cylinder by adopting a combination of special horizontal reinforcement ribs and arc reinforcement ribs on the outer wall of the outer liner, in conjunction with the setting of annular reinforcement ribs on the inner liner.

[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, the gas cylinder comprising an inner liner and an outer liner, the outer wall of the outer liner is provided with concave reinforcing ribs, and the outer wall of the inner liner is provided with convex reinforcing ribs;

[0008] The reinforcing ribs of the inner wall of the outer liner include at least 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG cylinder, at least 4 arc-shaped reinforcing ribs are arranged between adjacent horizontal reinforcing ribs, the two ends of the arc-shaped reinforcing ribs are independently connected to the horizontal reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG cylinder.

[0009] Among them, the number of horizontal reinforcing ribs and arc-shaped reinforcing ribs can be 4, 5, 6, 7 or 8 respectively, but are not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable.

[0010] In the present invention, the bending direction of the arc-shaped reinforcing ribs points to the longitudinal axis of the LNG cylinder (the LNG cylinder is in a lying state), and the curvature of the arc-shaped reinforcing ribs can be adjusted according to the size and material of the LNG cylinder, which is not specifically limited here. The length of the horizontal reinforcing ribs is equal to the length of the outer wall of the outer liner.

[0011] In the present invention, the outer wall of the outer liner adopts a special combination of horizontal reinforcement ribs and arc-shaped reinforcement ribs to achieve the best stress dispersion effect. The reason is that due to the special structure of the outer liner, during the collision test, the stress concentration on the bottom collision surface is evenly dispersed to the arc-shaped reinforcement rib structure. It is preliminarily estimated that the more arc-shaped reinforcement ribs there are, the more obvious the dispersion effect is. Combined with the raised annular reinforcement ribs on the outer wall of the inner liner, the strength of the LNG cylinder is further improved.

[0012] As a preferred technical solution of the present invention, the horizontal reinforcing ribs are arranged at equal intervals.

[0013] As a preferred technical solution of the present invention, the arc-shaped reinforcement ribs on both sides of the longitudinal axis of the LNG cylinder are independently arranged at equal intervals.

[0014] As a preferred technical solution of the present invention, the number of reinforcing ribs on the outer wall of the inner liner is 3 to 8, such as 3, 4, 5, 6, 7 or 8, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] Preferably, the reinforcing ribs are symmetrically distributed at equal intervals, and the spacing between the reinforcing ribs is 200~400 mm, such as 200 mm, 220 mm, 250 mm, 280 mm, 300 mm, 320 mm, 350 mm, 380 mm or 400 mm, but are not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] In the present invention, the "symmetry" in the equally spaced symmetrical distribution refers to a symmetrical distribution about the vertical center axis of the lying inner liner.

[0017] As a preferred technical solution of the present invention, the depth of the horizontal reinforcement ribs on the outer wall of the outer bladder is 10~20 mm, such as 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] Preferably, the width of the horizontal reinforcement ribs on the inner wall of the outer liner is 60~80 mm, such as 60 mm, 62 mm, 65 mm, 68 mm, 70 mm, 72 mm, 75 mm, 78 mm or 80 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] As a preferred technical solution of the present invention, the depth of the arc-shaped reinforcement ribs on the inner wall of the outer liner is 10 to 20 mm, such as 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the width of the arc-shaped reinforcement ribs on the inner wall of the outer liner is 60~80 mm, such as 60 mm, 62 mm, 65 mm, 68 mm, 70 mm, 72 mm, 75 mm, 78 mm or 80 mm, 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 height of the reinforcing ribs on the outer wall of the inner liner is 10 to 20 mm, such as 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] Preferably, the width of the reinforcing ribs of the outer wall of the inner liner is 60~80 mm, such as 60 mm, 62 mm, 65 mm, 68 mm, 70 mm, 72 mm, 75 mm, 78 mm or 80 mm, 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 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.

[0024] 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.

[0025] Preferably, the inner diameter of the outer liner is 900~910 mm, such as 900 mm, 901 mm, 902 mm, 903 mm, 904 mm, 905 mm, 906 mm, 907 mm, 908 mm, 909 mm or 910 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] As a preferred technical solution of the present invention, the thickness of the 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.

[0027] 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.

[0028] 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.

[0029] As a preferred technical solution of the present invention, the material of the outer liner and the outer liner are independently stainless steel.

[0030] In the present invention, the stainless steel material of the outer liner and the inner liner is preferably 304 stainless steel.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] The present invention provides an LNG gas cylinder, which is about 32% lighter than the original LNG gas cylinder. However, the strength of the LNG gas cylinder is ensured by adopting a combination of special horizontal reinforcement ribs and arc reinforcement ribs on the outer wall of the outer liner and the setting of the annular reinforcement ribs of the inner liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the outer liner structure of an LNG gas cylinder provided in Example 1 of the present invention;

[0034] Figure 2 A schematic diagram of the inner liner structure of an LNG gas cylinder provided in Example 1 of the present invention;

[0035] Figure 3 This is a stress distribution cloud diagram of the drop test of the LNG gas cylinder provided in Example 1 of the present invention.

[0036] 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

[0037] 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:

[0038] Example 1

[0039] This embodiment provides an LNG gas cylinder, the structure of which is as follows: Figure 1 and 2 As shown, the gas cylinder includes an inner liner and an outer liner, the outer liner has a thickness of 3 mm, a length of 1670 mm, and an inner diameter of 904 mm, and the inner liner has a thickness of 3 mm, a length of 1430 mm, and an inner diameter of 842 mm; the reinforcing ribs on the inner wall of the outer liner include 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG gas cylinder, and 4 arc-shaped reinforcing ribs (with an arc of 75°) are arranged between adjacent horizontal reinforcing ribs, and the two ends of the arc-shaped reinforcing ribs are independently connected to the horizontal reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG gas cylinder; 6 raised reinforcing ribs are symmetrically arranged on the outer wall of the inner liner at equal intervals; the thickness of the horizontal reinforcing ribs and the arc-shaped reinforcing ribs are independently 15 mm, and the width is independently 70 mm; the height of the reinforcing ribs on the outer wall of the inner liner is 15 mm, the width is 70 mm, and the spacing is 200 mm.

[0040] Example 2

[0041] This embodiment provides an LNG gas cylinder. Except that the number of arc-shaped reinforcing ribs is 6, other conditions of the LNG gas cylinder are the same as those of Embodiment 1.

[0042] Example 3

[0043] This embodiment provides an LNG gas cylinder, which is the same as that of Embodiment 1 except that the number of arc-shaped reinforcing ribs is 8.

[0044] Example 4

[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, and the inner liner has a thickness of 2.5 mm, a length of 1400 mm, and an inner diameter of 840 mm; the reinforcing ribs on the inner wall of the outer liner include 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG gas cylinder, and 4 arc-shaped reinforcing ribs (with an arc of 60°) are arranged between adjacent horizontal reinforcing ribs, and the two ends of the arc-shaped reinforcing ribs are independently connected to the horizontal reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG gas cylinder; three raised reinforcing ribs are symmetrically arranged on the outer wall of the inner liner at equal intervals; the thickness of the horizontal reinforcing ribs and the arc-shaped reinforcing ribs are independently 10 mm, and the width is independently 60 mm; the thickness of the reinforcing ribs on the outer wall of the inner liner is 10 mm, the width is 60 mm, and the spacing is 200 mm.

[0046] Example 5

[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, and the inner liner has a thickness of 4.5 mm, a length of 1450 mm, and an inner diameter of 850 mm; the reinforcing ribs on the inner wall of the outer liner include 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG gas cylinder, and 4 arc-shaped reinforcing ribs (with an arc of 90°) are arranged between adjacent horizontal reinforcing ribs, and the two ends of the arc-shaped reinforcing ribs are independently connected to the horizontal reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG gas cylinder; 8 raised reinforcing ribs are symmetrically arranged on the outer wall of the inner liner at equal intervals; the thickness of the horizontal reinforcing ribs and the arc-shaped reinforcing ribs are independently 20 mm, and the width is independently 80 mm; the thickness of the reinforcing ribs on the outer wall of the inner liner is 20 mm, the width is 80 mm, and the spacing is 200 mm.

[0048] Comparative Example 1

[0049] This comparative example provides an LNG gas cylinder, except that the inner liner is not provided with reinforcing ribs, the other conditions are the same as those of Example 1.

[0050] Example 2

[0051] This comparative example provides an LNG gas cylinder, except that the outer liner is not provided with horizontal reinforcing ribs, the other conditions are the same as those of Example 1.

[0052] Comparative Example 3

[0053] This comparative example provides an LNG gas cylinder, except that the outer liner is not provided with arc-shaped reinforcing ribs, the other conditions are the same as those of Example 1.

[0054] Comparative Example 4

[0055] This comparative example provides an LNG gas cylinder, except that the arc-shaped reinforcement ribs are replaced by annular reinforcement ribs, the other conditions are the same as those of Example 1.

[0056] The material of the inner liner and the outer liner of the LNG gas cylinder in Examples 1-5 and Comparative Examples 1-4 is 304 stainless steel.

[0057] A drop test was performed on an LNG gas cylinder provided in Examples 1-5 and Comparative Examples 1-4. The drop height was 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 shown in Table 1.

[0058] Table 1

[0059]

[0060] It can be seen from the test results in Table 1 that the drop test results of the LNG cylinders provided in Examples 1-5 of the present application are good, indicating that the LNG cylinders have high strength. Comparative Examples 1-3 do not have liner reinforcement ribs, horizontal reinforcement ribs, and arc reinforcement ribs, respectively, and the drop test results of the LNG cylinders become worse, and the strength of the LNG cylinders decreases. Comparative Example 4 changes the arc reinforcement ribs into annular reinforcement ribs, and the drop test results of the LNG cylinders thereof decrease slightly.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 outer wall of the outer liner is provided with concave reinforcing ribs, and the outer wall of the inner liner is provided with convex reinforcing ribs; The reinforcing ribs of the inner wall of the outer liner include at least 4 horizontal reinforcing ribs parallel to the horizontal axis of the LNG cylinder, at least 4 arc-shaped reinforcing ribs are arranged between adjacent horizontal reinforcing ribs, the two ends of the arc-shaped reinforcing ribs are independently connected to the horizontal reinforcing ribs on both sides, and the arc-shaped reinforcing ribs are symmetrically arranged with respect to the longitudinal axis of the LNG cylinder; the number of the reinforcing ribs of the outer wall of the inner liner is 3 to 8; the reinforcing ribs of the outer wall of the inner liner are symmetrically distributed with equal intervals, and the spacing between the reinforcing ribs of the outer wall of the inner liner is 200 to 400 mm.

2. The LNG cylinder according to claim 1, characterized in that: The depth of the horizontal reinforcement ribs on the outer wall of the outer bladder is 10-20 mm.

3. The LNG cylinder according to claim 1, characterized in that: The width of the horizontal reinforcement ribs on the inner wall of the outer liner is 60-80 mm.

4. The LNG cylinder according to claim 1, characterized in that: The depth of the arc-shaped reinforcement ribs on the inner wall of the outer liner is 10-20 mm.

5. The LNG cylinder according to claim 1, characterized in that: The width of the arc-shaped reinforcement ribs on the inner wall of the outer liner is 60-80 mm.

6. The LNG cylinder according to claim 1, characterized in that: The height of the reinforcing ribs on the outer wall of the inner liner is 10-20 mm.

7. The LNG cylinder according to claim 1, characterized in that: The width of the reinforcing ribs on the outer wall of the inner container is 60-80 mm.

8. The LNG cylinder according to claim 1, characterized in that: The thickness of the outer liner is 2.5-3.5 mm.

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

10. The LNG cylinder according to claim 1, characterized in that: The inner diameter of the outer bladder is 900-910 mm.

11. The LNG cylinder according to claim 1, characterized in that: The thickness of the liner is 2.5-3.5 mm.

12. The LNG cylinder according to claim 1, characterized in that: The length of the inner liner is 1400-1450 mm.

13. The LNG cylinder according to claim 1, characterized in that: The inner diameter of the liner is 840-850 mm.

14. The LNG cylinder according to claim 1, characterized in that: The outer liner and the inner liner are made of stainless steel respectively and independently.

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