Hydrogen storage cylinder capable of preventing inner container from buckling

Abstract

The invention discloses a hydrogen storage cylinder capable of preventing buckling of an inner container, which relates to the technical field of hydrogen storage and comprises the inner container, a fiber winding layer, a valve seat and an end plug. Grooves are formed in the two ends of the inner container, and ventilation cylinders are arranged in the centers of the grooves. The valve seat comprises an embedded part and a connector, the embedded part is embedded into the groove, and the connector is connected with the embedded part. The end plug is in threaded connection with the connector. The fiber winding layer is wound from one valve seat to the other valve seat through the inner container. The outer side of the valve seat is coated with a lubricant layer, friction force is reduced, and therefore the valve seat and the fiber winding layer can slide relatively in the pressure circulation process. The embedded part is provided with a conical surface I, and the conical surface I is used for flaring the port of the fiber winding layer. Compared with the prior art, hydrogen gathered between the inner container and the fiber winding layer can be automatically discharged, and therefore the problem that the inner container is bent is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen storage, and in particular to a hydrogen storage gas cylinder capable of preventing inner liner from buckling. Background Art

[0002] As the main hydrogen storage equipment for hydrogen energy vehicles, the plastic liner fiber fully wrapped high-pressure hydrogen storage cylinder (referred to as "Type IV hydrogen storage cylinder") has broad development prospects. Type IV hydrogen storage cylinders have the advantages of high hydrogen storage density and good fatigue resistance, but the plastic liner has low stiffness and there is a risk of buckling instability during use. Summary of the invention

[0003] The purpose of the present invention is to provide a hydrogen storage cylinder with an anti-buckling inner liner, so that the hydrogen accumulated between the inner liner and the fiber winding layer can be automatically discharged.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The invention discloses a hydrogen storage gas cylinder with an anti-buckling inner liner, comprising an inner liner, a fiber winding layer, a valve seat and an end plug;

[0006] The two ends of the inner liner are provided with grooves, and the center of the groove is a vent cylinder; the valve seat includes an embedded part and an interface, the embedded part is connected to the interface, and the embedded part is embedded in the groove; the valve seat has a center hole that passes through the embedded part and the interface, the end plug is threadedly connected to the center hole from the side where the interface is located, and the vent cylinder is inserted into the center hole from the side where the embedded part is located; the fiber winding layer is wound from one valve seat to the other valve seat through the inner liner;

[0007] The outer side of the valve seat is coated with a lubricant layer so that the valve seat can slide relative to the fiber winding layer; the embedded portion has a conical surface 1, and the conical surface 1 is used to expand the port of the fiber winding layer.

[0008] Preferably, the end plug comprises a cover plate, an external thread section and a cylindrical section which are connected in sequence.

[0009] Preferably, a sealing ring 1 is provided between the interface and the cover plate, and a sealing ring 2 is provided between the cylindrical section and the interface.

[0010] Preferably, a plurality of sealing rings are provided between the embedded portion and the ventilation cylinder.

[0011] Preferably, the interface has a cylindrical surface and a conical surface 2, and the conical surface 1, the cylindrical surface and the conical surface 2 are connected in sequence; from an end close to the cylindrical surface to an end away from the cylindrical surface, the diameters of the conical surface 1 and the conical surface 2 gradually increase.

[0012] Preferably, the groove includes an annular plate and a conical plate, the end of the ventilation cylinder facing away from the end plug is connected to the inner edge of the annular plate, and the outer edge of the annular plate is connected to the inner edge of the conical plate; the diameter of the conical plate gradually decreases from the end close to the cylindrical surface to the end facing away from the cylindrical surface.

[0013] Preferably, the embedded portion further has a conical surface three, an end surface and an inner cylindrical surface, the conical surface three is used to fit the conical plate, the end surface is used to fit the annular plate, and the inner cylindrical surface is used to fit the ventilation cylinder;

[0014] The annular plate is provided with an annular protrusion 1, and the end surface is provided with an annular groove 1 matching the annular protrusion 1; the ventilation cylinder has an annular protrusion 2, and the inner cylindrical surface is provided with an annular groove 2 matching the annular protrusion 2.

[0015] Preferably, the inner liner is made of plastic.

[0016] Preferably, the valve seat and the end plug are made of metal.

[0017] Compared with the related art, the present invention has achieved the following technical effects:

[0018] The present invention limits the valve seat and the inner container to each other through an embedded design, and limits the valve seat to each other through a conical surface of the valve seat and a fiber winding layer, so as to ensure that the valve seat will not fly out under the action of high pressure.

[0019] When the inner liner is exhausted, the valve seat slides axially inward relative to the fiber winding layer. During the inflation and pressure-maintaining process, the embedded portion of the valve seat expands and shapes the port of the fiber winding layer. As the valve seat slides inward, the port of the fiber winding layer cannot remain close to the valve seat, but forms a gas channel between the valve seat and the valve seat. The hydrogen accumulated in the gap between the inner liner and the fiber winding layer is discharged to the atmosphere through the gas channel, avoiding the problem of buckling of the inner liner.

[0020] During the sliding process of the valve seat, the lubricant layer reduces friction, allowing the valve seat and the fiber winding layer to produce a larger relative displacement, thereby increasing the expansion and shaping effect of the fiber winding layer, thereby forming a larger gas channel when the inner tank is exhausted, facilitating the discharge of hydrogen in the gap.

[0021] In the preferred embodiment of the present invention, a multi-stage sealing ring is provided to ensure that hydrogen is discharged along a preset path. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a hydrogen storage cylinder with an anti-buckling inner liner according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Specific structural distribution diagram of China Hydrogen Storage Cylinders;

[0025] Figure 3 is a schematic diagram of the valve seat;

[0026] Figure 4 Schematic diagram of bubbles being discharged along the gas channel.

[0027] In the figure:

[0028] 1- liner; 2- fiber winding layer; 3- valve seat; 4- end plug; 5- sealing assembly; 6- air bubble;

[0029] 11-groove; 12-ventilation cylinder; 111-circular ring plate; 112-conical plate; 121-annular protrusion 2; 1111-annular protrusion 1;

[0030] 31-embedded part; 32-interface; 33-lubricant layer; 311-conical surface 1; 312-conical surface 3; 313-end surface; 321-cylindrical surface; 322-conical surface 2; 314-inner cylindrical surface;

[0031] 41-cover plate; 42-external thread section; 43-cylinder section;

[0032] 51- Sealing ring one; 52- Sealing ring two; 53- Sealing ring three. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a hydrogen storage cylinder with an anti-buckling inner liner, so that the hydrogen accumulated between the inner liner and the fiber winding layer can be automatically discharged.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 , Figure 2 and Figure 4 The dot-dash line in represents the central symmetry plane. For ease of understanding, Figure 4 The size ratio of bubble 6 to the hydrogen storage cylinder is magnified in the figure. In actual situation, the ratio of bubble 6 is smaller than Figure 4 The proportions shown.

[0036] Reference Figure 1 to Figure 4 The present embodiment provides a hydrogen storage cylinder with an anti-buckling inner liner (hereinafter referred to as a hydrogen storage cylinder), including an inner liner 1, a fiber winding layer 2, a valve seat 3 and an end plug 4.

[0037] The inner liner 1 is provided with grooves 11 at both ends, and the center of the groove 11 is a vent cylinder 12, through which hydrogen flows into and out of the inner liner 1. The valve seat 3 includes an embedding portion 31 and an interface 32, the embedding portion 31 is connected to the interface 32, and the embedding portion 31 is embedded in the groove 11. The valve seat 3 has a central hole that passes through the embedding portion 31 and the interface 32, the end plug 4 is threadedly connected to the central hole from the side where the interface 32 is located, and the vent cylinder 12 is inserted into the central hole from the side where the embedding portion 31 is located. The fiber winding layer 2 is wound from one valve seat 3 to another valve seat 3 through the inner liner 1, so as to simultaneously bind the valve seat 3 and the inner liner 1 inside.

[0038] The outer side of the valve seat 3 is coated with a lubricant layer 33 so that the valve seat 3 can slide relative to the fiber winding layer 2. The embedded portion 31 has a conical surface 1 311, and the end with a smaller diameter of the conical surface 1 311 is closer to the port of the fiber winding layer 2 than the end with a larger diameter, so that during the inflation and pressure-maintaining process, the port of the fiber winding layer 2 is expanded through the conical surface 1 311.

[0039] The working principle of the hydrogen storage cylinder in this embodiment is as follows:

[0040] The applicant has found through research that the occurrence of buckling is mainly related to the accumulation of hydrogen in the gap between the inner liner 1 and the fiber winding layer 2 during the use of the hydrogen storage cylinder due to hydrogen penetration, which is related to the pressure difference formed.

[0041] Therefore, in this embodiment, when the inner liner 1 is exhausted, bubbles 6 formed by hydrogen accumulation in the gap between the inner liner 1 and the fiber winding layer 2 are periodically and automatically discharged, thereby avoiding the problem of buckling of the inner liner.

[0042] When the inner container 1 is inflated, the valve seat 3 slides axially outward relative to the fiber winding layer 2 , the port of the fiber winding layer 2 is enlarged, and the inner surface near the port is in close contact with the embedded portion 31 .

[0043] When the inner liner 1 is pressurized, hydrogen permeates the inner liner 1 under high pressure, and hydrogen dissolves into the inner liner 1, diffuses, and then desorbs into the gap between the inner liner 1 and the fiber winding layer 2. The gap between the inner liner 1 and the fiber winding layer 2 is distributed between the inner liner and the fiber winding layer.

[0044] When the inner liner 1 is exhausted, the valve seat 3 slides axially inward relative to the fiber winding layer 2. During the inflation and pressure-maintaining process, the embedded portion 31 of the valve seat 3 expands and shapes the port of the fiber winding layer 2. As the valve seat 3 slides inward, the port of the fiber winding layer 2 cannot remain close to the valve seat 3, but forms a gas channel between the valve seat 3, and the hydrogen accumulated in the gap is discharged to the atmosphere through the gas channel, avoiding the problem of buckling of the inner liner.

[0045] When the inner liner 1 is inflated next time, the unexhausted hydrogen near the end of the fiber winding layer 2 will be squeezed out to the atmosphere by the valve seat 3 as the valve seat 3 slides outward relative to the fiber winding layer 2 .

[0046] During the sliding process of the valve seat 3, the lubricant layer 33 reduces friction, allowing the valve seat 3 and the fiber winding layer 2 to produce a larger relative displacement, thereby increasing the expansion and shaping effect of the fiber winding layer 2, thereby forming a larger gas channel when the inner tank 1 is exhausted, facilitating the discharge of hydrogen in the gap.

[0047] As a possible example, in this embodiment, the end plug 4 includes a cover plate 41, an external thread section 42 and a cylindrical section 43 which are connected in sequence.

[0048] The external thread section 42 is used to cooperate with the internal thread section of the center hole of the valve seat 3. The cover plate 41 is used to contact and limit the end surface of the interface 32 to limit the screw-in distance of the external thread section 42. The cylinder section 43 is used to be inserted into the ventilation cylinder 12, and the ventilation cylinder 12 maintains its own shape and position through the plugging of the two. When the end plug 4 is installed, the ventilation cylinder 12 is not ventilated; when the end plug 4 is removed, the ventilation cylinder 12 is ventilated.

[0049] As a possible example, in this embodiment, a sealing ring 1 51 is provided between the interface 32 and the cover plate 41 , and a sealing ring 2 52 is provided between the cylindrical section 43 and the interface 32 .

[0050] By providing the sealing ring 1 51 and the sealing ring 2 52 , the sealing performance between the interface 32 and the end plug 4 is improved.

[0051] As a possible example, in this embodiment, a plurality of sealing rings 3 53 are provided between the embedded portion 31 and the ventilation cylinder 12. The sealing ring 1 51, the sealing ring 2 52 and the sealing ring 3 53 form the sealing assembly 5 of this embodiment. For example, the number of the sealing rings 3 53 is three.

[0052] By providing the sealing ring 3 53 , the sealing performance between the interface 32 and the groove 11 is improved.

[0053] As a possible example, in this embodiment, the interface 32 has a cylindrical surface 321 and a second conical surface 322, and the first conical surface 311, the cylindrical surface 321 and the second conical surface 322 are connected in sequence. From one end close to the cylindrical surface 321 to the end away from the cylindrical surface 321, the diameters of the first conical surface 311 and the second conical surface 322 gradually increase.

[0054] The first conical surface 311 is used to expand the end of the fiber winding layer 2 when the inner liner 1 is inflated and pressure maintained. The second conical surface 322 is used to limit the size of the gas channel when the inner liner 1 is exhausted.

[0055] As a possible example, in this embodiment, the groove 11 includes an annular plate 111 and a conical plate 112, the end of the vent cylinder 12 away from the end plug 4 is connected to the inner edge of the annular plate 111, and the outer edge of the annular plate 111 is connected to the inner edge of the conical plate 112. From the end close to the cylindrical surface 321 to the end away from the cylindrical surface 321, the diameter of the conical plate 112 gradually decreases.

[0056] As a possible example, in this embodiment, the embedded portion 31 also has a conical surface three 312, an end surface 313 and an inner cylindrical surface 314, the conical surface three 312 is used to fit the conical plate 112, the end surface 313 is used to fit the annular plate 111, the inner cylindrical surface 314 is used to fit the ventilation cylinder 12, and the inner cylindrical surface 314 is a part of the center hole of the valve seat 3.

[0057] The annular plate 111 is provided with an annular protrusion 1111, and the end surface 313 is provided with an annular groove 1 matching the annular protrusion 1111. The ventilation cylinder 12 has an annular protrusion 2 121, and the inner cylindrical surface 314 is provided with an annular groove 2 matching the annular protrusion 121.

[0058] The cooperation between the annular protrusion 1111 and the annular groove 1 is used to limit the relative movement between the embedded part 31 and the groove 11 in the radial direction. The cooperation between the annular protrusion 121 and the annular groove 2 is used to limit the relative movement between the embedded part 31 and the groove 11 in the axial direction.

[0059] As a possible example, in this embodiment, the inner liner 1 is made of plastic, and the valve seat 3 and the end plug 4 are made of metal. According to different actual needs, those skilled in the art may also choose other materials.

[0060] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydrogen storage cylinder with an anti-buckling liner, characterized in that: It includes an inner liner, a fiber winding layer, a valve seat and an end plug; The two ends of the inner liner are provided with grooves, and the center of the groove is a vent cylinder; the valve seat includes an embedded part and an interface, the embedded part is connected to the interface, and the embedded part is embedded in the groove; the valve seat has a center hole that passes through the embedded part and the interface, the end plug is threadedly connected to the center hole from the side where the interface is located, and the vent cylinder is inserted into the center hole from the side where the embedded part is located; the fiber winding layer is wound from one valve seat to the other valve seat through the inner liner; The outer side of the valve seat is coated with a lubricant layer so that the valve seat can slide relative to the fiber winding layer; the embedded portion has a conical surface 1, and the conical surface 1 is used to expand the port of the fiber winding layer.

2. The hydrogen storage cylinder with anti-buckling inner liner according to claim 1, characterized in that: The end plug comprises a cover plate, an external thread section and a cylindrical section which are connected in sequence.

3. The hydrogen storage cylinder with anti-buckling liner according to claim 2, characterized in that: A sealing ring 1 is provided between the interface and the cover plate, and a sealing ring 2 is provided between the cylindrical section and the interface.

4. The hydrogen storage cylinder with anti-buckling liner according to claim 1, characterized in that: A plurality of sealing rings are arranged between the embedding portion and the ventilation cylinder.

5. The hydrogen storage cylinder with anti-buckling inner liner according to claim 1, characterized in that: The interface has a cylindrical surface and a second conical surface, and the first conical surface, the cylindrical surface and the second conical surface are connected in sequence; from an end close to the cylindrical surface to an end away from the cylindrical surface, the diameters of the first conical surface and the second conical surface gradually increase.

6. The hydrogen storage cylinder with anti-buckling inner liner according to claim 5, characterized in that: The groove includes an annular plate and a conical plate. The end of the vent cylinder away from the end plug is connected to the inner edge of the annular plate, and the outer edge of the annular plate is connected to the inner edge of the conical plate. The diameter of the conical plate gradually decreases from the end close to the cylindrical surface to the end away from the cylindrical surface.

7. The hydrogen storage cylinder with anti-buckling liner according to claim 6, characterized in that: The embedded part also has a conical surface three, an end surface and an inner cylindrical surface, the conical surface three is used to fit the conical plate, the end surface is used to fit the annular plate, and the inner cylindrical surface is used to fit the ventilation cylinder; The annular plate is provided with an annular protrusion 1, and the end surface is provided with an annular groove 1 matching the annular protrusion 1; the ventilation cylinder has an annular protrusion 2, and the inner cylindrical surface is provided with an annular groove 2 matching the annular protrusion 2.

8. The hydrogen storage cylinder with anti-buckling liner according to claim 1, characterized in that: The inner container is made of plastic.

9. The hydrogen storage cylinder with anti-buckling liner according to claim 1, characterized in that: The valve seat and the end plug are made of metal.

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