Gas storage container and gas transportation equipment

Abstract

The invention relates to the technical field of gas transportation equipment, and discloses a gas storage container and gas transportation equipment. The gas storage container comprises a metal inner container, the metal inner container comprises a middle pipe section and a bottle opening section, the bottle opening section is fixedly arranged at the end of the middle pipe section, and the wall thickness of the middle pipe section is not larger than that of the bottle opening section; the fiber reinforced layer is connected to the outer surface of the metal inner container in a covering mode, and the metal inner container is completely covered with the fiber reinforced layer. The metal liner is formed by adopting a thinned metal material with unequal wall thickness, so that the steel consumption of the gas storage container is reduced, and the overall weight of the gas storage container is reduced. The outer side of the metal inner container is completely covered with the fiber reinforcement layer formed outside the metal inner container, so that bearing force is provided by the fiber reinforcement layer, the requirements for light gravity and high bearing capacity of the gas storage container are met, light weight of gas storage is further achieved, and the carrying efficiency of gas remote transportation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas transportation equipment, and in particular to a gas storage container and gas transportation equipment. Background Art

[0002] High-pressure gas cylinders are used to store and transport gases under high pressure, such as oxygen, hydrogen, nitrogen, etc. These cylinders are made of high-strength materials, can withstand high pressure and ensure safe use. In industry, high-pressure gas cylinders provide power for pneumatic tools and compressed air systems; the medical field relies on them to provide patients with necessary oxygen therapy; scientific research and aerospace fields are also inseparable from the support of high-pressure gas cylinders. When using high-pressure gas cylinders, special attention should be paid to the storage environment, the safety of handling and installation, and the understanding of gas characteristics to ensure that they can safely and efficiently serve all walks of life.

[0003] In the prior art, high-pressure gas cylinders used in long-tube trailers or tube bundle containers are mainly large-volume seamless steel cylinders with a working pressure of 20MPa or 25MPa. The main material used in the gas cylinders is steel, which is heavy. Combined with the weight limit of the long-tube trailer or tube bundle container, the loading capacity of the high-pressure gas is limited, and the development of the working pressure to a higher pressure level is also restricted. Summary of the invention

[0004] In view of this, the present invention provides a gas storage container and gas transportation equipment to solve the problem of small transportation capacity of high-pressure gas cylinders in long tube trailers and tube bundle containers.

[0005] In a first aspect, the present invention provides a gas storage container, comprising:

[0006] The metal liner comprises a middle tube section and a bottle mouth section, wherein the bottle mouth section is fixedly arranged at the end of the middle tube section, and the wall thickness of the middle tube section is not greater than the wall thickness of the bottle mouth section;

[0007] The fiber reinforced layer is covered and connected to the outer surface of the metal inner liner, and the fiber reinforced layer completely covers the metal inner liner.

[0008] The metal liner is formed by thinning metal materials with different wall thicknesses to reduce the amount of steel used in the gas storage container and reduce the overall weight of the gas storage container. In order to minimize the weight of the metal, the middle pipe section is set to the minimum wall thickness that can meet the design strength. However, under this minimum wall thickness condition, the wall thickness at both ends of the steel pipe cannot meet the thickness required for subsequent bottle mouth molding. Therefore, the wall thickness of the bottle mouth section at both ends is set to be thicker than the minimum design wall thickness to meet the wall thickness requirements for subsequent bottle mouth section molding. By forming a fiber reinforced layer on the outside of the metal liner to completely cover the outside of the metal liner, the fiber reinforced layer provides bearing pressure to meet the requirements of light weight and high pressure bearing capacity of the gas storage container, further realize the lightweight of gas storage, and improve the carrying efficiency of gas long-distance transportation.

[0009] In an optional embodiment, the wall thickness of the middle pipe section near the end is smaller than the wall thickness of the middle pipe section near the middle.

[0010] In an optional embodiment, the wall thickness of the middle pipe section gradually decreases from the ends to the middle. By setting the wall thickness of the middle pipe section to gradually decrease from the two ends to the middle, it is avoided that the gas pressure inside the metal liner forms stress concentration in the metal liner and causes damage, thereby improving the stability of the metal liner.

[0011] In an optional embodiment, the fiber reinforcement layer includes reinforcement fibers and a fixing resin, the reinforcement fibers are wound around the outside of the metal liner, and the fixing resin is filled in the gaps between the reinforcement fibers. The reinforcement fibers are impregnated with a thermosetting fixing resin and wound around the outside of the metal liner to form a fiber reinforcement layer composed of a composite material, so that the gas storage container has the required pressure bearing performance.

[0012] In an optional embodiment, an intermediate bonding layer is coated between the fiber-reinforced layer and the metal liner, and the fiber-reinforced layer and the metal liner are fixedly connected via the intermediate bonding layer. The outer surface of the metal liner is coated, and the coating serves as an intermediate bonding layer to bond the interface between the metal liner and the fiber-reinforced layer, thereby preventing the metal liner from degrading due to corrosion during long-term use.

[0013] In an optional embodiment, the intermediate bonding layer is made of an electrically insulating material. The intermediate bonding layer protects the metal from corrosion while also preventing electrochemical corrosion between the reinforcing fibers and the metal liner, thereby ensuring that the performance of the liner remains stable during long-term use. The material of the intermediate bonding layer includes but is not limited to nylon, polyurethane, etc., with a thickness of 30-90 μm and a shear strength greater than 45 MPa, which can ensure that the interaction between the metal liner and the fiber reinforcement layer does not cause failure of the metal liner and the fiber reinforcement layer when the gas storage container is repeatedly charged and discharged with high-pressure gas in the subsequent process, thereby ensuring the safe use of the gas storage container throughout its life cycle.

[0014] In an optional embodiment, a bottle outer protective layer and / or bottle outer decorative layer is arranged outside the fiber reinforced layer. The bottle outer protective layer makes the gas storage container impact-resistant, fire-resistant and UV-resistant, and the bottle outer decorative layer can improve the appearance of the gas storage container.

[0015] In an optional embodiment, the middle tube section and the bottle mouth section are integrally formed from a metal tube body, and the bottle mouth section is formed into a bottle mouth structure with an inner diameter smaller than the metal tube body by spinning or formed into a closed bottle bottom structure by spinning.

[0016] In an optional embodiment, the metal tube body is thinned and formed into a tube structure with a side wall thickness varying along the axial direction by strong spinning.

[0017] In a second aspect, the present invention further provides a gas transportation device having the gas storage container of the present invention. Since the gas transportation device system includes the gas storage container, it has the same effect as the gas storage container, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a gas storage container provided in an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0021] Figure 3 A schematic structural diagram of an intermediate pipe section provided in an embodiment of the present invention.

[0022] Explanation of the reference numerals: 1. metal liner; 101. middle pipe section; 102. bottle mouth section; 2. fiber reinforcement layer; 3. bottle outer protective layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0025] According to an embodiment of the present invention, on the one hand, a gas storage container is provided, comprising a metal liner 1 and a fiber reinforced layer 2. The gas storage container can be a bottle body, a box body, a tank body, etc. of any shape. In this embodiment, a cylindrical gas storage cylinder is used for explanation. The gas storage container is used to store gas and is used to transport gas in conjunction with transportation equipment.

[0026] The metal liner 1 includes a middle tube section 101 and a bottle mouth section 102. The bottle mouth section 102 is fixedly arranged at the end of the middle tube section 101. The wall thickness of the middle tube section 101 is not greater than the wall thickness of the bottle mouth section 102. The fiber reinforced layer 2 is covered and connected to the outer surface of the metal liner 1. The fiber reinforced layer 2 completely covers the metal liner 1.

[0027] The metal liner 1 is formed by thinning metal materials with different wall thicknesses to reduce the amount of steel used in the gas storage container and reduce the overall weight of the gas storage container. In order to minimize the weight of the metal, the middle pipe section 101 is set to the minimum wall thickness that can meet the design strength. However, under this minimum wall thickness condition, the wall thickness at both ends of the steel pipe cannot meet the thickness required for subsequent bottle mouth molding. Therefore, the wall thickness of the bottle mouth section 102 at both ends is set to be thicker than the minimum design wall thickness to meet the wall thickness requirements for subsequent bottle mouth section 102 molding. By forming a fiber reinforced layer 2 on the outside of the metal liner 1 to completely cover the outside of the metal liner 1, the fiber reinforced layer 2 provides bearing pressure to meet the requirements of light weight and high pressure bearing capacity of the gas storage container, further realize the lightweight of gas storage, and improve the carrying efficiency of gas long-distance transportation.

[0028] In one embodiment, the wall thickness of the middle tube section 101 near the end is smaller than the wall thickness near the middle of the middle tube section 101. In this embodiment, the inner wall of the middle tube section 101 is thinned by a strong spinning thinning process, so that the metal liner 1 is formed into a bottle structure with uniform outer diameter and variable inner diameter.

[0029] Furthermore, the wall thickness of the middle pipe section 101 gradually decreases from the ends to the middle. By setting the wall thickness of the middle pipe section 101 to gradually decrease from the two ends to the middle, it is avoided that the internal gas pressure of the metal liner 1 forms stress concentration in the metal liner 1 and causes damage, thereby improving the stability of the metal liner 1.

[0030] In one embodiment, the fiber reinforced layer 2 includes reinforcing fibers and a fixing resin, the reinforcing fibers are wound around the outside of the metal liner 1, and the fixing resin is filled in the gaps between the reinforcing fibers. The reinforcing fibers are impregnated with a thermosetting fixing resin and wound around the outside of the metal liner 1 to form a fiber reinforced layer 2 composed of a composite material, so that the gas storage container has the required pressure bearing performance.

[0031] In one embodiment, an intermediate bonding layer is coated between the fiber reinforced layer 2 and the metal liner 1, and the fiber reinforced layer 2 and the metal liner 1 are fixedly connected via the intermediate bonding layer. The outer surface of the metal liner 1 is coated, and the coating serves as an intermediate bonding layer to bond the interface between the metal liner 1 and the fiber reinforced layer 2, thereby preventing the performance of the metal liner 1 from being degraded due to corrosion during long-term use.

[0032] In one embodiment, the intermediate bonding layer is made of an electrically insulating material. While protecting the metal from corrosion, the intermediate bonding layer also prevents electrochemical corrosion between the reinforcing fibers and the metal liner 1, thereby ensuring that the performance of the liner remains stable during long-term use. The material of the intermediate bonding layer includes, but is not limited to, nylon, polyurethane, etc., with a thickness of 30-90 μm and a shear strength greater than 45 MPa, which can ensure that the interaction between the metal liner 1 and the fiber reinforced layer 2 does not cause failure of the metal liner 1 and the fiber reinforced layer 2 when the gas storage container is repeatedly charged and discharged with high-pressure gas, thereby ensuring the safe use of the gas storage container throughout its entire life cycle.

[0033] In one embodiment, an outer protective layer 3 and / or an outer decorative layer is disposed outside the fiber reinforced layer 2. The outer protective layer 3 makes the gas storage container resistant to impact, fire and ultraviolet rays, and the outer decorative layer can improve the appearance of the gas storage container.

[0034] In one embodiment, the middle tube section 101 and the bottle mouth section 102 are integrally formed from a metal tube body, and the bottle mouth section 102 is formed into a bottle mouth structure with an inner diameter smaller than the metal tube body by spinning or is formed into a closed bottle bottom structure by spinning. In some other embodiments, the middle tube section 101 and the bottle mouth section 102 can be made separately and then fixedly connected into an integral structure by welding.

[0035] In one embodiment, the metal tube body is thinned and formed into a tube structure with a side wall thickness varying along the axial direction by strong spinning.

[0036] This embodiment also provides a method for forming the gas storage container, comprising the following steps:

[0037] A metal steel pipe body for forming the metal liner 1 is manufactured, and a part of the metal liner 1 is manufactured using the metal steel pipe body. The metal liner 1 is heat treated so that the liner has the required and stable mechanical properties. The mouth section 102 of the metal liner 1 is processed for mouth molding according to the valve to be connected subsequently and the connection structure with the frame. The metal steel pipe body is formed with different wall thicknesses by strong spinning and thinning, in order to ensure that the weight of the liner is the lightest while ensuring strength and process conditions. The material of the metal steel pipe body includes but is not limited to chromium-molybdenum steels such as 30CrMo, 34CrMo4, 4130X, and can also be other metal materials that meet the requirements of pressure vessels. The unequal wall thickness refers to forming the wall thickness of the middle part of the metal steel pipe body into the minimum wall thickness required for the strength of the metal liner 1. In order to ensure that the metal liner 1 is the lightest, it is necessary to achieve the minimum wall thickness while meeting the design strength. However, under the condition of this minimum wall thickness, the wall thickness at both ends of the metal steel pipe body cannot meet the thickness required for the subsequent bottle mouth section 102 to be formed. Therefore, when the metal steel pipe body is strongly rotated and thinned, the wall thickness of the openings at both ends of the metal steel pipe body is thicker than the minimum design wall thickness of the metal steel pipe body to meet the wall thickness requirements required for the subsequent intermediate pipe section 101 and the bottle mouth section 102 to be formed. The bottle mouth section 102 part is formed by spinning or bottoming the unequal wall thickness positions pre-processed at both ends of the metal steel pipe body. By adopting the spinning closing of unequal wall thickness, it can be ensured that the bottle mouth section 102 has sufficient and tight metal residue to ensure the length of the subsequent bottle mouth section 102 and the quality of the connecting thread. The bottle mouth section 102 is provided with connecting structures such as valves inside and a structure connected to the frame outside. The bottle mouth section 102 needs to be thick enough to ensure that its mechanical properties can meet the overall pressure-bearing performance of the gas cylinder while having the above functions.

[0038] The outer surface of the metal liner 1 is coated to form an intermediate bonding layer. The intermediate bonding layer serves as an interface bonding layer between the metal liner 1 and the fiber reinforced layer 2 composed of a composite material, which can prevent the metal liner 1 from degrading due to corrosion during long-term use. While protecting the metal from corrosion, it also prevents electrochemical corrosion between the carbon fiber inside the fiber reinforced layer 2 and the metal liner 1, thereby ensuring that the performance of the liner remains stable during long-term use. The material of the intermediate bonding layer includes but is not limited to nylon, polyurethane, etc., with a thickness of 30-90μm and a shear strength of more than 45MPa, which can ensure that the interaction between the interface layers does not cause failure of the connection between the metal liner 1 and the fiber reinforced layer 2 when the gas cylinder is repeatedly filled and discharged with high-pressure gas, thereby ensuring safe use throughout the life cycle. The reinforcing fibers in the fiber reinforced layer 2 are formed by a winding process, and the fixed resin is cured to complete the production of the gas cylinder.

[0039] After the reinforcing fiber is impregnated with a thermosetting or thermoplastic fixed resin, it is wound around the outside of the metal liner 1 to form a fiber reinforced layer 2, so that the gas cylinder has the required performance. The fiber reinforced layer 2 is kept warm at a set temperature for a predetermined time, and the set temperature and the predetermined time are respectively the temperature and time for curing the thermosetting or thermoplastic fixed resin. The fiber reinforced layer 2 is composed of a composite material composed of reinforcing fibers and a fixed resin matrix, and a bottle outer protective layer 3 is arranged on the fiber reinforced layer 2. Thermosetting or thermoplastic resins can use epoxy resins or unsaturated resins, which are cured at a certain rate by adjusting anhydride or amine curing agents and accelerators. Thermoplastic materials such as polyethylene and polyethylene terephthalate can also be used to heat and shape and then cool and solidify.

[0040] The outer side of the fiber reinforcement layer 2 is formed with a bottle outer protective layer 3, which makes the gas cylinder have the effects of impact resistance, fire resistance and UV resistance. The bottle outer protective layer 3 can be a glass fiber outer protective layer formed by winding and curing glass fiber and a flame retardant and UV resistant resin system, or a coating with certain mechanical properties and flame retardancy and UV resistance. The coating material is not limited to polymer materials such as polyurethane and polyester.

[0041] The gas storage container provided in this embodiment is used as a gas cylinder for storing high-pressure gas in a long-tube trailer and a bundle-type container. The gas cylinder determines the capacity and efficiency of storing and transporting high-pressure gas, solves the problems of small transportation capacity and low transportation efficiency of traditional long-tube trailers and bundle-type containers, and significantly improves the high-pressure gas loading capacity of high-pressure storage and transportation long-tube trailers and bundle-type containers. At the same time, it is also conducive to the development of the industry in the direction of higher-pressure gas storage and transportation. The gas storage container provided in this embodiment reduces the proportion of steel in the overall high-pressure gas cylinder on the basis of the original steel liner, and uses composite materials as a reinforced structure. The working pressure of the gas cylinder can be further increased while the weight is reduced, and the high-pressure gas loading capacity is greatly increased. For example, under the same working pressure of 25MPa, the weight of the empty box can be reduced by 25%, and the gas carrying capacity can be increased by 35%. The fiber-reinforced layer 2 composed of reinforcing fibers and fixed resins is reinforced to replace pure metal to ensure that the structure weight is the lightest, which can not only improve the higher pressure-bearing performance, but also improve the storage and transportation, so it has more advantages. After thinning the metal materials with different wall thicknesses to form the liner, high-strength, high-modulus fibers and high-toughness resin systems are selected, and the winding technology is used to reinforce the composite material layer. The resin matrix is ​​solidified at a certain temperature to achieve the bearing pressure provided by the fiber-wound composite material layer to meet the requirements of light weight and high pressure of the gas cylinder, further achieving lightweight and improving transportation efficiency. The high-pressure gas cylinder formed by using a steel liner and fiber full winding reinforcement not only has the high bearing capacity and fatigue performance of conventional gas storage cylinders, but also has better impact resistance than aluminum alloy or plastic liner fully wrapped gas cylinders. In a life cycle of 20 years or even longer, its safety and stability are more advantageous.

[0042] According to an embodiment of the present invention, on the other hand, a gas transportation device is also provided, which has the gas storage container described in this embodiment. Because the gas transportation equipment system includes a gas storage container, it has the same effect as the gas storage container, which will not be repeated here. The gas transportation equipment is a long tube trailer or a tube bundle container. The gas storage container is fixedly connected to the transport vehicle through an installation frame. The gas storage container is usually a cylindrical gas cylinder. The gas storage container can be arranged along the length direction of the transport vehicle, or along the width direction of the transport vehicle, or vertically fixed on the transport vehicle along the height direction, or arranged in any direction of the gas according to demand. The tube bundle container is usually composed of large-volume steel seamless gas cylinders or fiber-wound gas cylinders and a frame. These gas cylinders can be individual or bundled to form a mobile pressure vessel as a whole. The long tube trailer is composed of several large steel seamless gas cylinders connected together by piping and valves, usually installed in a semi-trailer or container frame to form a high-pressure gas transportation device. Gas storage containers are high-pressure gas cylinders used to store gas on long-tube trailers or tube-bundle containers. They have a volume of 150L-4300L and a working pressure of 20MPa-99MPa.

[0043] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A gas storage container, characterized in that: include: A metal liner (1), comprising an intermediate tube section (101) and a bottle mouth section (102), wherein the bottle mouth section (102) is fixedly arranged at the end of the intermediate tube section (101), and the wall thickness of the intermediate tube section (101) is not greater than the wall thickness of the bottle mouth section (102); The fiber-reinforced layer (2) is covered and connected to the outer surface of the metal inner liner (1); the fiber-reinforced layer (2) completely covers the metal inner liner (1).

2. The gas storage container according to claim 1, characterized in that: The wall thickness of the middle pipe section (101) near the end is smaller than the wall thickness of the middle pipe section (101) near the middle.

3. The gas storage container according to claim 2, characterized in that: The wall thickness of the middle pipe section (101) gradually decreases from the end to the middle.

4. The gas storage container according to any one of claims 1 to 3, characterized in that: The fiber-reinforced layer (2) comprises reinforcing fibers and a fixing resin, the reinforcing fibers are wound and formed on the outside of the metal liner (1), and the fixing resin is filled in the gaps between the reinforcing fibers.

5. The gas storage container according to any one of claims 1 to 3, characterized in that: An intermediate bonding layer is coated between the fiber-reinforced layer (2) and the metal liner (1), and the fiber-reinforced layer (2) and the metal liner (1) are fixedly connected via the intermediate bonding layer.

6. The gas storage container according to claim 5, characterized in that: The intermediate bonding layer is made of electrical insulating material.

7. The gas storage container according to any one of claims 1 to 3, characterized in that: The outer side of the fiber reinforced layer (2) is provided with a bottle outer protective layer (3) and / or a bottle outer decorative layer.

8. The gas storage container according to any one of claims 1 to 3, characterized in that: The middle tube section (101) and the bottle mouth section (102) are integrally formed from a metal tube body, and the bottle mouth section (102) is formed into a bottle mouth structure with an inner diameter smaller than that of the metal tube body by spinning or is formed into a closed bottle bottom structure by spinning.

9. The gas storage container according to claim 8, characterized in that: The metal tube body is thinned and formed into a tube structure with a side wall thickness varying along the axial direction by strong spinning.

10. A gas transport device, characterized in that A gas storage container according to any one of claims 1 to 9.

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