End socket winding method for carbon fiber 45MPa long pipe hydrogen transporting cylinder and hydrogen transporting cylinder

Abstract

The invention discloses a carbon fiber 45 MPa long pipe hydrogen transporting cylinder end socket winding method and a hydrogen transporting cylinder, relates to the technical field of hydrogen storage and transportation, and is applied to a pipe bundle container type long pipe hydrogen transporting cylinder with the maximum hydrogen storage pressure being 45 MPa. The method comprises the following steps: constructing a target geometric model of a tube bundle container type long-tube hydrogen transporting cylinder; based on the target geometric model, determining a winding thickness model and a winding angle model at the end socket; correcting the thickness of the winding thickness model at the polar hole position of the target geometric model based on parabola correction to obtain a winding thickness correction model; and on the basis of the winding thickness correction model and the winding angle model, carbon fibers are used for conducting end socket winding on a lining of the tube bundle container type long tube hydrogen transporting cylinder. The technical problem that in the prior art, a carbon fiber winding method cannot meet the strength requirement of the high-pressure hydrogen storage bottle is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage and transportation, and particularly to a winding method for the head of a 45MPa long tube hydrogen transport cylinder made of carbon fiber and a hydrogen transport cylinder. Background Art

[0002] The storage and transportation of hydrogen is an important link in the utilization of hydrogen energy. Currently, the biggest bottleneck restricting the popularization of hydrogen energy is the storage and transportation of hydrogen. Among them, the long-distance transportation of hydrogen is one of the important restricting links at present, mainly due to the relatively high transportation cost. The existing long tube trailers for hydrogen storage mainly have pressures of 20MPa and 30MPa, and the hydrogen storage density is relatively low. In order to improve the transportation efficiency and reduce the transportation cost, a higher-pressure long tube truck trailer is needed. The 45MPa long tube trailer is proposed under such a background, which can increase the hydrogen transportation volume by more than 50% and reduce the cost by about 30%.

[0003] Compared with low-pressure hydrogen storage cylinders, to increase the working pressure of high-pressure hydrogen storage cylinders, a more internally pressurized liner and a carbon fiber winding layer need to be designed. Simply increasing the wall thickness and the amount of carbon fiber winding cannot meet the strength requirements of high-pressure hydrogen storage cylinders. Summary of the Invention

[0004] The purpose of the present invention is to provide a winding method for the head of a 45MPa long tube hydrogen transport cylinder made of carbon fiber and a hydrogen transport cylinder to solve at least one of the above technical problems.

[0005] In a first aspect, an embodiment of the present invention provides a winding method for the head of a 45MPa long tube hydrogen transport cylinder, which is applied to a bundle-type long tube hydrogen transport cylinder with a maximum hydrogen storage pressure of 45MPa; the method includes: constructing a target geometric model of the bundle-type long tube hydrogen transport cylinder; based on the target geometric model, determining a winding thickness model and a winding angle model at the head; correcting the thickness at the polar hole position of the winding thickness model in the target geometric model based on parabola correction to obtain a corrected winding thickness model; based on the corrected winding thickness model and the winding angle model, performing head winding on the liner of the bundle-type long tube hydrogen transport cylinder using carbon fiber; wherein, the winding thickness model includes: , where r 0 is the outer radius of the cylinder body of the target geometric model, α 0 is the carbon fiber winding angle at the cylinder body, r is the radius of the head of the target geometric model, α is the carbon fiber winding angle at the position corresponding to the radius r of the head, t is the carbon fiber winding thickness at the position corresponding to the head radius r, r 0 is the thickness of a single layer of carbon fiber, BW is the width of a single layer of carbon fiber, r p is the polar hole radius at the head.

[0006] Further, the winding method of winding the head with carbon fiber on the inner liner of the tube bundle assembled long tube hydrogen transport cylinder includes helical winding.

[0007] Further, the winding angle model includes: , where α is the carbon fiber winding angle at the position corresponding to the radius r at the head.

[0008] In a second aspect, an embodiment of the present invention further provides a hydrogen transport cylinder, including an inner liner and a carbon fiber layer wound around the outer layer of the inner liner. The carbon fiber layer at the head of the hydrogen transport cylinder is wound around the outer layer of the inner liner based on the carbon fiber 45 MPa long tube hydrogen transport cylinder head winding method provided by the embodiment of the present invention.

[0009] Further, the maximum hydrogen storage pressure of the hydrogen transport cylinder is 45 MPa.

[0010] The present invention provides a carbon fiber 45 MPa long tube hydrogen transport cylinder head winding method and a hydrogen transport cylinder. For the long tube high-pressure gas cylinder wound by this winding method, the strength of the head is higher than that of the cylinder body, avoiding the dangerous situation of head bursting of the hydrogen cylinder, and alleviating the technical problem that the existing carbon fiber winding method cannot meet the strength requirements of high-pressure hydrogen storage cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 is a flowchart of a carbon fiber 45 MPa long tube hydrogen transport cylinder head winding method provided by an embodiment of the present invention; Figure 2 is a schematic diagram of a winding thickness model at the head provided by an embodiment of the present invention; Figure 3 is a schematic diagram of a parabola correction provided by an embodiment of the present invention; Figure 4 is a front view of the head provided by an embodiment of the present invention; Figure 5 is a front view of the thickness distribution of carbon fiber winding on the head based on the carbon fiber 45 MPa long tube hydrogen transport cylinder head winding method provided by an embodiment of the present invention; Figure 6A schematic diagram of a carbon fiber winding method for a 45MPa carbon fiber long tube hydrogen tank head provided in an embodiment of the present invention, showing a variable angle of the carbon fiber winding method for the head; Figure 7 A side view of the thickness distribution of carbon fiber winding on a head according to the carbon fiber 45MPa long tube hydrogen tank head winding method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0013] 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.

[0014] Figure 1 This is a flow chart of a carbon fiber 45MPa long tube hydrogen tank head wrapping method provided according to an embodiment of the present invention. The method is applied to a tube bundle containerized long tube hydrogen tank with a maximum hydrogen storage pressure of 45MPa. Figure 1 As shown, the method specifically comprises the following steps: Step S102, constructing a target geometric model of the bundled containerized long tube hydrogen tank, wherein the target geometric model includes the barrel length, barrel outer diameter, head geometry, and head hole size of the bundled containerized carbon fiber long tube hydrogen tank.

[0015] Step S104, determining the winding thickness model and winding angle model at the end cap based on the target geometric model.

[0016] Figure 2 FIG. 1 is a schematic diagram of a winding thickness model at a head provided according to an embodiment of the present invention. Figure 2 As shown, the winding thickness model includes: , In the formula, r 0 is the outer radius of the cylinder of the target geometric model, α 0 is the carbon fiber winding angle at the barrel, r is the radius of the head of the target geometric model, α is the carbon fiber winding angle at the position corresponding to the radius r at the head, t is the carbon fiber winding thickness at the position corresponding to the radius r at the head, t 0 is the thickness of a single carbon fiber layer, BW is the width of a single carbon fiber layer, r p is the radius of the hole at the end cap.

[0017] Optionally, the BW value is 88 mm.

[0018] According to the winding thickness model, during the spiral winding process, an under-reaming process needs to be adopted. At this time, it can be considered that the radius of the polar hole changes. According to the above formula, when the radius of the polar hole is determined, the angle and the fiber thickness of the fiber at any position of the head and the cylinder body are uniquely determined.

[0019] Step S106: Based on the parabola correction, correct the thickness at the polar hole position of the winding thickness model in the target geometric model to obtain a corrected winding thickness model.

[0020] Figure 3 FIG. is a schematic diagram of parabola correction provided by an embodiment of the present invention. Among them, the dashed line is a schematic diagram of the curve corresponding to the winding thickness model, and the solid line is a schematic diagram of the curve corresponding to the corrected winding thickness model after parabola correction. As Figure 3 shown, near the polar hole of the winding thickness model, the thickness of the fiber will tend to infinity. However, in the actual winding process, when the fiber is stacked to a certain thickness, slippage will occur between the fibers, causing the fiber thickness near the polar hole to be redistributed. Therefore, the present invention uses parabola to correct the thickness near the fiber polar hole.

[0021] Step S108: Based on the corrected winding thickness model and the winding angle model, use carbon fiber to wind the head on the inner liner of the tube bundle containerized long tube hydrogen transport cylinder.

[0022] Preferably, the winding method of using carbon fiber to wind the head on the inner liner of the tube bundle containerized long tube hydrogen transport cylinder includes spiral winding.

[0023] Figure 4 FIG. is a front view of the head provided by an embodiment of the present invention. As Figure 4 shown, the winding angle model includes: The starting point of the winding of the fiber at point A on the head part, and the curve ABCD is the winding path of the fiber on the head, where AB and CD are tangent to the polar hole respectively. Since in the software, the laying angle of the fiber takes the meridian where the unit is located as the reference direction of the fiber, in order to simulate the trend of the fiber along AB, the angle relationship between each meridian and AB needs to be obtained.

[0024] Figure 4 Four meridians within the central angle ABO are drawn in. During the change of the meridian from OA - Op - Oq - OB, the included angle α (∠Opq) of the meridian and AB gradually changes from α 0 to 90°. When point A moves along the edge of the head (i.e., other fibers from the cylinder body), AB rotates around the center of the polar hole and is always tangent to the polar hole; and during the movement of point A, ∠BOA is only related to the radius of the polar hole. When the radius of the polar hole is determined, ∠BOA is a fixed value, which also means that during the change of the polar radius Op, the locus of p is a circle with Op as the radius. From the above geometric relationship, it can be deduced thatθ Relationship with the polar radius Op. According to this relationship, the ply angle corresponding to the position of each unit can be calculated. If the polar radius Op = r , then the angle α corresponding to this polar radius is: , In the formula, is the carbon fiber winding angle at the position corresponding to the radius r at the head.

[0025] Figure 5 Figure 12 is a front view of the thickness distribution of carbon fiber winding on the head according to the carbon fiber winding method for the head of a 45 MPa long tube hydrogen transport cylinder provided by the embodiment of the present invention. Figure 6 Figure 14 is a schematic diagram of variable angles of carbon fiber winding on the head according to the carbon fiber winding method for the head of a 45 MPa long tube hydrogen transport cylinder provided by the embodiment of the present invention. Figure 7 Figure 16 is a side view of the thickness distribution of carbon fiber winding on the head according to the carbon fiber winding method for the head of a 45 MPa long tube hydrogen transport cylinder provided by the embodiment of the present invention.

[0026] As can be seen from the above description, the present invention provides a carbon fiber winding method for the head of a 45 MPa long tube hydrogen transport cylinder. For the long tube high-pressure gas cylinder wound by this winding method, the strength of the head is higher than that of the cylinder body, avoiding the dangerous situation of head explosion of the hydrogen cylinder, and alleviating the technical problem that the existing carbon fiber winding method cannot meet the strength requirements of high-pressure hydrogen storage cylinders.

[0027] The present invention also provides a hydrogen transport cylinder, including a liner and a carbon fiber layer wound on the outer layer of the liner. Among them, the carbon fiber layer at the head of the hydrogen transport cylinder is wound on the outer layer of the liner according to the carbon fiber winding method for the head of a 45 MPa long tube hydrogen transport cylinder provided by the embodiment of the present invention.

[0028] Preferably, the maximum hydrogen storage pressure of the hydrogen transport cylinder provided by the embodiment of the present invention is 45 MPa and can be used for high-pressure hydrogen storage.

[0029] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0030] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A carbon fiber 45MPa long tube hydrogen tank head winding method, characterized in that: Applicable to a tube bundle-assembled long-tube hydrogen tank with a maximum hydrogen storage pressure of 45 MPa; the method comprises: Constructing a target geometric model of the tube bundle containerized long tube transport hydrogen cylinder; Based on the target geometric model, determining a winding thickness model and a winding angle model at the head; Based on the parabola correction, the thickness of the winding thickness model at the polar hole position of the target geometric model is corrected to obtain a winding thickness correction model; Based on the winding thickness correction model and the winding angle model, carbon fiber is used to perform head winding on the inner lining of the tube bundle containerized long tube hydrogen cylinder; Wherein, the winding thickness model includes: ， Where r0 is the outer radius of the barrel of the target geometric model, α0 is the carbon fiber winding angle at the barrel, r is the radius of the head of the target geometric model, α is the carbon fiber winding angle at the position corresponding to the radius r at the head, t is the carbon fiber winding thickness at the position corresponding to the radius r at the head, r0 is the thickness of a single layer of carbon fiber, BW is the width of a single layer of carbon fiber, r p is the radius of the hole at the end cap.

2. The method according to claim 1, characterized in that: The winding method of using carbon fiber to wrap the head on the inner liner of the tube bundle container type long tube hydrogen cylinder includes spiral winding.

3. The method according to claim 1, characterized in that: The winding angle model comprises: ， Where α is the carbon fiber winding angle at the corresponding position of the radius r at the head.

4. A hydrogen transport cylinder, comprising an inner liner and a carbon fiber layer wound around the outer layer of the inner liner, characterized in that: The carbon fiber layer at the head of the hydrogen transport cylinder is wound around the outer layer of the lining based on the carbon fiber 45MPa long tube hydrogen transport cylinder head winding method described in any one of claims 1 to 3.

5. The hydrogen transport cylinder according to claim 4, characterized in that: The maximum hydrogen storage pressure of the hydrogen transport cylinder is 45MPa.

Images