Lightweight structure of vehicle liquefied natural gas bottle shell

Abstract

The utility model is suitable for the technical field of vehicle liquefied natural gas cylinders, and provides a vehicle liquefied natural gas cylinder shell lightweight structure which comprises a gas cylinder shell, the nominal thickness of the gas cylinder shell is 3 mm, a plurality of reinforcing rings are distributed on the gas cylinder shell at equal intervals in the length direction of the gas cylinder shell, and the reinforcing rings are arranged in the gas cylinder shell. And the reinforcing ring is arranged on the gas cylinder shell in a welding or integral forming manner. According to the structure, the nominal thickness of the gas cylinder shell can be reduced from 4 mm to 3 mm, the rigidity of the whole structure can be greatly improved through the supporting effect of the reinforcing ring, it is guaranteed that the rigidity of the whole structure is not lower than that of the scheme before thinning, the using working condition is met, the weight of a needed raw material steel plate is reduced, and the weight and manufacturing cost of the liquefied natural gas cylinder for the vehicle are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied natural gas bottles for vehicles, and in particular relates to a lightweight structure of a shell of a liquefied natural gas bottle for vehicles. Background Art

[0002] In recent years, with the gradual establishment and implementation of national policies and regulations on energy conservation, emission reduction and green environmental protection, automobile energy conservation has become a key research topic in the development of the automobile industry. Studies have shown that reducing the weight of the car itself is one of the effective measures to improve the fuel economy of the car and reduce the CO2 emissions of the car. According to a report by the World Aluminum Association, for every 10% reduction in the weight of a general car, fuel consumption can be reduced by 6% to 8%.

[0003] At present, large-volume liquefied natural gas cylinders for vehicles usually adopt a double-layer structure. The inner tank contains low-temperature liquefied natural gas, and the outer shell and the inner tank together form a vacuum interlayer to keep the low-temperature liquid in the inner tank cold. At the same time, the outer shell also plays a role in supporting the inner tank. The thickness of the outer shell is directly related to the strength of the outer shell rigidity. If the outer shell rigidity is insufficient, it will become unstable and sag during the vacuum pumping process of the gas cylinder. When in use, the gas cylinder needs to be assembled to the frame and fastened with a strap. The maximum pre-tightening force of the nut of the strap can reach 130N-140N. Insufficient outer shell rigidity will also cause the contact surface with the frame to sag. In addition, when the gas cylinder is installed on the vehicle, the instantaneous vertical acceleration of the gas cylinder can reach 7g on bumpy roads. Combined with the above factors, if the outer shell rigidity does not meet the road conditions, it will also cause instability and sag, affecting use.

[0004] For existing liquefied natural gas cylinders, according to the stiffness verification formula, the shell design wall thickness of the super-large volume cylinder shall not be less than 3.7mm, and the nominal thickness is 4mm. The weight is about 160-180 kg, and the shell is made of austenitic stainless steel, with a material cost of about 3,000 yuan. How to reduce the wall thickness of the liquefied natural gas cylinder while ensuring the stiffness is a feasible way to effectively reduce the weight and cost of the liquefied natural gas cylinder. Therefore, a lightweight structure of the shell of a vehicle liquefied natural gas cylinder is provided. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a lightweight structure of a shell of a liquefied natural gas bottle for a vehicle, aiming to solve the problems raised in the above-mentioned background technology.

[0006] The embodiment of the utility model is implemented as follows: a lightweight structure of a vehicle liquefied natural gas cylinder shell includes a cylinder shell, the nominal thickness of the cylinder shell is 3 mm, and the cylinder shell is provided with a plurality of reinforcement rings equidistantly distributed along its length direction, and the reinforcement rings are arranged on the cylinder shell by welding or integral molding.

[0007] According to a further technical solution, the reinforcement ring is made of austenitic stainless steel.

[0008] A further technical solution is that when the reinforcement ring is fixed to the gas cylinder shell by welding, the reinforcement ring is manufactured by roll forming, and the reinforcement ring is welded to the inner side of the gas cylinder shell, and the welding type is double-sided short welding.

[0009] According to a further technical solution, when the reinforcement ring and the gas cylinder shell are manufactured in an integrally formed manner, the reinforcement ring may be concave inwards or convex outwards.

[0010] The embodiment of the utility model provides a lightweight structure of a vehicle liquefied natural gas cylinder shell, which can reduce the nominal thickness of the cylinder shell from 4 mm to 3 mm. Through the supporting effect of the reinforcement ring, the rigidity of the overall structure can be greatly improved to ensure that its rigidity is not lower than that of the solution before thinning and meets the use conditions. The weight of the raw material steel plate can be reduced by about 40 kilograms, and the cost of a single unit can be reduced by 600-700 yuan, greatly reducing the weight and manufacturing cost of the vehicle liquefied natural gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a lightweight structure of a shell of a liquefied natural gas bottle for a vehicle provided by an embodiment of the utility model;

[0012] Figure 2 for Figure 1 A in the enlarged view;

[0013] Figure 3 Another structural schematic diagram of a lightweight structure of a shell of a liquefied natural gas bottle for a vehicle provided by an embodiment of the utility model;

[0014] Figure 4 for Figure 3 Enlarged view of point B in .

[0015] In the accompanying drawings: gas cylinder shell 1; reinforcement ring 2. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0018] like Figure 1-4As shown, a lightweight structure of a vehicle liquefied natural gas cylinder shell provided by an embodiment of the utility model includes a cylinder shell 1, the nominal thickness of the cylinder shell 1 is 3 mm, and the cylinder shell 1 is provided with a plurality of reinforcement rings 2 equidistantly distributed along its length direction, and the reinforcement rings 2 are arranged on the cylinder shell 1 by welding or integral molding.

[0019] In the embodiment of the utility model, the size and quantity of the reinforcement ring 2 and the minimum thickness of the steel plate are obtained through CAE analysis and must meet the demanding use conditions. When the reinforcement ring 2 is fixed to the gas cylinder shell 1 by welding, the reinforcement ring 2 is manufactured by roll forming, and the reinforcement ring 2 is welded to the inner side of the gas cylinder shell 1. The welding with the gas cylinder shell 1 should be firm and reliable. The welding type is double-sided broken welding, and the total length of the single-sided broken welding is not less than 1 / 3 of the inner circumference of the gas cylinder shell 1.

[0020] When the reinforcement ring 2 and the gas cylinder shell 1 are manufactured in an integrally formed manner, the reinforcement ring 2 can be concave inward or convex outward. The molding process is as follows: the gas cylinder shell 1 is first rolled into a circle and the longitudinal seam is welded, and a special rolling die is used to roll convex or concave reinforcement ribs on the gas cylinder shell 1 to ensure that the molding size of the reinforcement ring 2 meets the design requirements. The reinforcement ring 2 and the gas cylinder shell 1 form a whole to improve its rigidity.

[0021] Through the above structure, the nominal thickness of the gas cylinder shell 1 can be reduced from 4mm to 3mm. Through the supporting effect of the reinforcing ring 2, the rigidity of the overall structure can be greatly improved to ensure that its rigidity is not lower than that before thinning and meets the use conditions. The weight of the raw material steel plate can be reduced by about 40 kilograms, and the cost of a single unit can be reduced by 600-700 yuan, greatly reducing the weight and manufacturing cost of the vehicle liquefied natural gas cylinder.

[0022] As a preferred embodiment of the present utility model, the reinforcement ring 2 is made of austenitic stainless steel.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lightweight structure of a liquefied natural gas cylinder shell for a vehicle, comprising a cylinder shell, characterized in that: The nominal thickness of the gas cylinder shell is 3 mm. The gas cylinder shell is provided with a plurality of reinforcement rings equidistantly distributed along its length direction, and the reinforcement rings are arranged on the gas cylinder shell by welding or integral molding.

2. The lightweight structure of the shell of the liquefied natural gas bottle for vehicle according to claim 1 is characterized in that: The reinforcement ring is made of austenitic stainless steel.

3. The lightweight structure of the shell of the liquefied natural gas bottle for vehicle according to claim 2 is characterized in that: When the reinforcement ring is fixed to the gas cylinder shell by welding, the reinforcement ring is manufactured by roll forming, and the reinforcement ring is welded to the inner side of the gas cylinder shell, and the welding type is double-sided short welding.

4. The lightweight structure of the shell of the liquefied natural gas bottle for vehicle according to claim 2 is characterized in that: When the reinforcement ring and the gas cylinder shell are manufactured in an integrally formed manner, the reinforcement ring may be concave inwardly or convex outwardly.

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