CN115854247A - Carbon fiber winding circumferential external corrugation pressure container shell ring structure and preparation method - Google Patents

Abstract

The invention relates to a structure and a preparation method of a carbon fiber-wound circumferentially outwardly corrugated pressure vessel cylinder section, which combines a metal circumferentially outwardly corrugated cylinder section liner with a composite material layer, wherein the circumferentially outward corrugations increase the strength of the lining, Carbon fiber epoxy composite layers further increase the overall load carrying capacity. The inner lining of the metal circumferential outer corrugated tube section is integrally formed by rolling, and the processing process is convenient and efficient; the carbon fiber epoxy resin composite material layer adopts fiber winding technology, and the carbon fiber epoxy resin is wound on the outer corrugated wall of the inner lining; finally, carbon fiber Curing and molding of winding layers. The formed carbon fiber winding circumferentially outward corrugated pressure vessel shell structure has the characteristics of light weight, high bearing capacity, and good fatigue resistance.

Description

Carbon fiber wound circumferentially outward corrugated pressure vessel shell section structure and preparation method

technical field

The invention relates to the technical field of hydrogen storage pressure vessels, in particular to a carbon fiber winding circumferentially outward corrugated pressure vessel shell section structure and a preparation method.

Background technique

Hydrogen energy, as a secondary energy source with extensive sources, efficient utilization, clean and environmental protection, is an important direction of global new energy research. With the extensive research on hydrogen energy, hydrogen storage pressure vessels have also been developed accordingly.

At present, the more common hydrogen storage pressure vessels in the domestic market are mainly single-layer hydrogen storage pressure vessels, which are generally made of low-alloy high-strength steel seamless steel pipes, and their structures are mostly cylindrical structures with equal wall thickness. Due to the large amount of high-pressure hydrogen storage, frequent charging and discharging, and the risk of hydrogen embrittlement, leakage and explosion, the wall thickness parameters of the hydrogen storage container are usually designed to be large in order to meet the high-pressure and changeable working environment, but at the same time, it is also aggravated. the weight of the overall structure.

For this reason, it is necessary to design a composite material hydrogen storage pressure vessel, which is required to have the ability to increase the critical load, and has a lighter overall weight at the same time.

Contents of the invention

In view of the problems existing in the prior art, the purpose of the present invention is to provide a carbon fiber-wound circumferentially outward corrugated pressure vessel shell section structure, which can effectively increase the critical failure load of the metal pressure vessel while reducing the overall weight of the structure.

The technical scheme that the present invention adopts is as follows:

A carbon fiber wound circumferentially outwardly corrugated pressure vessel shell structure proposed by the present invention comprises a metal circumferentially outward corrugated shell liner and carbon fiber epoxy with a certain thickness wound on the outer corrugations of the metal circumferentially outwardly corrugated shell liner. Resin composite layer.

A method for preparing a carbon fiber wound circumferentially outward corrugated pressure vessel shell structure, comprising the following steps:

S1. Metal circumferential outer corrugated tube section liner rolling forming;

S2. Pretreatment of the inner and outer surfaces of the metal circumferential outer corrugated tube section lining;

S3. Carbon fiber wraps metal circumferentially outward corrugated tube section liner to form a carbon fiber epoxy resin composite material layer;

S4, the carbon fiber epoxy resin composite material layer is cured and formed.

Further, in step S1, the rolling mill used in the rolling forming process of the metal circumferential outer corrugated tube section liner is a special corrugated rolling mill, the driving roll of which is a corrugated roll, and the core roll is a cylindrical roll.

Further, in step S1, the corrugation shape function of the inner liner of the metal circumferential outer corrugated cylinder section is a cosine function:

y=A cos(2πx/T)

In the formula: A is the amplitude of the function; T is the period of the function.

The amplitude A of the parameter of the topography function should be less than or equal to the average thickness of the inner lining of the metal circumferential outer corrugated barrel section, and the length of the inner lining of the barrel section should be an integer multiple of the period T of the function.

Further, in step S2, after the pretreatment of the inner and outer surfaces, the surface roughness of the inner surface of the inner surface of the metal circumferential outer corrugated tube section is 3.2 μm, and the outer corrugated surface roughness is controlled at 6.3 μm.

Further, in step S3, the winding method of the carbon fiber winding is non-geodesic winding, and the dry winding process is used to melt the epoxy resin with the pre-impregnated carbon fiber bundle through a heating device, and then wrap it around the metal circumference. On the outer corrugated wall of the corrugated barrel section liner.

Further, the carbon fiber bundle is composed of several carbon fiber filaments, and the thickness of the carbon fiber bundle is 0.2-0.3mm.

Further, the change law of the winding angle of the non-geodesic winding is obtained through the differential equation of the non-geodesic winding angle, and the equation is:

In the formula: λ is the slip coefficient; α is the winding angle; r is the radius of gyration; r' and r" are the first and second derivatives of the radius of gyration to the axis coordinate z of the mandrel, respectively.

Further, in step S4, the curing temperature of the curing molding is ≥70° C., and the curing time is 20-30 minutes.

Compared with the prior art, the present invention has the following beneficial effects:

1. The metal circumferential outer corrugated barrel section liner used in the present invention improves the bearing capacity of the hydrogen storage pressure vessel compared with the ordinary cylindrical barrel section; compared with other ribbed pressure vessels, its circumferential outer corrugated way more convenient and efficient.

2. The carbon fiber epoxy resin composite material layer used in the present invention is combined with the metal circumferential outer corrugated barrel section liner, which further enhances the bearing capacity of the metal liner; compared with the same thickness of pure metal pressure vessels, carbon fiber epoxy Resin-reinforced circumferentially outward corrugated pressure vessel sections have lighter weight and better fatigue resistance.

Description of drawings

Fig. 1 is a schematic diagram of the rolling process of a carbon fiber winding circumferentially outward corrugated pressure vessel shell structure proposed by the present invention;

Fig. 2 is a structural schematic diagram of the metal circumferential outer corrugated cylinder section in Fig. 1;

Fig. 3 is a structural schematic diagram of a carbon fiber-wound metal circumferentially outward corrugated pressure vessel section.

Wherein, the reference signs: 1- metal circumferential outer corrugated cylinder section; 2- carbon fiber epoxy resin composite material layer; 3- driving roller; 4- core roller; 5- tapered guide roller.

Detailed ways

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "another side", "left", " The orientation or positional relationship indicated by "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not mean that the device or element must have a specific orientation, be configured in a specific orientation, and operate.

A carbon fiber winding circumferentially outward corrugated pressure vessel shell structure proposed by the present invention comprises a metal circumferentially outward corrugated shell liner 1 and a carbon fiber epoxy resin composite material layer 2 of a certain thickness, the carbon fiber epoxy resin composite The material layer 2 is made of carbon fiber bundles bonded by epoxy resin glue solution, and wound on the outer corrugated wall of the metal circumferential outer corrugated tube section liner 1 by a fiber winding machine with a certain winding rule.

A method for preparing a carbon fiber-wound circumferentially outward corrugated pressure vessel shell structure, specifically comprising the following steps:

S1: Metal circumferential outer corrugated barrel section liner rolling forming;

Specifically, the metal circumferential outer corrugated drum section liner 1 is formed by rolling, and the rolling mill includes a driving roll 3, a core roll 4, and a guide roll 5; in the present invention, the existing rolling mill The driving roller 3 is replaced by a corrugated roller to realize the integral molding of the metal circumferential outer corrugated tube section liner 1; the core roller 4 is a cylindrical roller; the guide roller 5 is a tapered roller.

The length of the metal circumferential outer corrugated tube liner 1 is set as L, the inner diameter is set as D, and the average thickness is set as S; the circumferential outer corrugation of the metal circumferentially outer corrugated tube liner 1 is Evenly distributed to the ports at both ends of the barrel section, the corrugation shape parameter is a cosine function:

y=A cos(2πx/T)

In the formula: A is the amplitude of the function; T is the period of the function.

For the circumferential outer corrugation shape parameters, the amplitude A of the function should be less than or equal to the average thickness S of the inner lining of the metal cylinder section, and the length L of the cylinder section should be an integer multiple of the period T of the function, namely:

A≤S

L=nT

In the formula: n is a multiple.

S2: Pretreatment of the inner and outer surfaces of the metal circumferential outer corrugated tube section lining;

Specifically, surface pretreatment is carried out on the outer surface and inner surface of the metal circumferential outer corrugated tubular segment liner 1 respectively, and the surface roughness value of the inner surface of the tubular segment is 3.2 μm; in order to make the fiber bundle Stable winding on the outer corrugated surface does not produce slippage. The surface roughness of the outer corrugated surface of the barrel section should be controlled at 6.3 μm. The stable winding conditions are:

λ≤μ

Where: λ is the slip coefficient; μ is the maximum static friction coefficient.

S3: carbon fiber wraps metal circumferentially outward corrugated tube section liner 1 to form a carbon fiber epoxy resin composite material layer 2;

Specifically, the carbon fiber epoxy resin composite material layer 2 is a fiber bundle composed of several carbon fiber filaments and epoxy resin glue solution in a certain proportion, and passes through the fiber bundle according to a certain rule under the bonding action of the epoxy resin glue solution. The winding machine winds the reinforcing layer on the inner liner 1 of the metal circumferential outer corrugated barrel section. The winding method of the carbon fiber winding is non-geodesic winding, and a dry winding process is adopted. The pre-impregnated carbon fiber bundle is melted by a heating device to melt the epoxy resin, and then wound on the inner liner 1 of the metal circumferential outer corrugated tube section. On the outer corrugated wall, every time the carbon fiber bundle moves a wide distance in the axial direction, the fiber winding machine will drive the metal circumference to rotate one circle toward the outer corrugated tube section liner 1, and the thickness of a single layer of fibers is 0.2-0.3mm, and several layers are wound.

The non-geodesic winding, its winding angle change law can be obtained by the non-geodesic winding angle differential equation, and the equation is:

In the formula: λ is the slip coefficient; α is the winding angle; r is the radius of gyration; r' and r" are the first and second derivatives of the radius of gyration to the axis coordinate z of the mandrel, respectively.

S4: The carbon fiber winding layer is solidified and formed;

Specifically, after fiber winding molding, put the pressure shell into a heating furnace for curing and molding. The curing temperature should not be less than 70°C, and the curing time should be 20-30 minutes. Finally, a carbon fiber epoxy resin composite circumferentially outwardly corrugated pressure vessel is formed. barrel section.

The present invention will be further described below by specific examples:

The materials to be prepared in this embodiment include: a fiber bundle composed of an aluminum alloy blank ring, carbon fiber filaments and epoxy resin. The width of the fiber bundle is controlled to be 3 mm, and the thickness is controlled to be 0.2 mm.

The specific preparation method is as follows:

S1: Metal circumferential outer corrugated tube section liner rolling forming

As shown in Figure 1, choose the corrugated driving roller 3 with appropriate corrugation parameters, place the aluminum alloy blank between the corrugated driving roller 3 and the core roller 4, and place the tapered guide roller 5 outside the aluminum alloy blank. Turn on the power and carry out the rolling process to form the metal circumferential outer corrugated tube section liner 1 as shown in Figure 2. The size of the liner after rolling is controlled as inner diameter D=300mm, length L=260mm, average thickness S= 4mm, the amplitude of the outer corrugation is 2, and the period is 40mm, the function is:

y=2cos(0.05πx)

S2: Pretreatment of the inner and outer surfaces of the metal circumferential outer corrugated tube section lining

After the rolling is finished, impurities on the inner and outer surfaces of the corrugated barrel section liner 1 outside the metal circumference are cleaned. By mechanical processing, the surface roughness of the inner surface of the metal circumferential outer corrugated barrel section liner 1 is controlled to be less than or equal to 3.2 μm, and the surface roughness of the outer corrugated surface is controlled to be 6.3 μm.

S3: carbon fiber wound metal circumferential outer corrugated barrel section liner

Fix the inner liner 1 of metal circumferential outer corrugated tube section on the carbon fiber winding machine, and carry out carbon fiber winding reinforcement on it. The winding method is non-geodesic winding. According to the external dimensions and shape parameters of the metal circumferential outer corrugated tube section liner 1, through the non-geodesic winding angle differential equation, the winding angle change in the half cycle of the outer circumferential corrugation is obtained According to the law, the data is brought in to determine that the winding angle ranges from 89.65° to 89.66°. Every time the carbon fiber bundle moves a distance of a bandwidth along the axial direction, the fiber winding machine will drive the metal circumference to the outer corrugated tube section liner 1 to rotate for a circle, winding 30 layers A carbon fiber epoxy resin composite material layer 2 is formed with a layer thickness of 6mm. Among them, the non-geodesic winding angle differential equation is:

In the formula: λ is the slip coefficient; α is the winding angle; r is the radius of gyration; r' and r" are the first and second derivatives of the radius of gyration to the axis coordinate z of the mandrel, respectively.

S4: Carbon fiber winding layer curing molding

Put the wrapped aluminum alloy circumferentially outward corrugated cylinder section into a curing furnace for curing and molding, and finally form the carbon fiber-wound circumferentially outwardly corrugated pressure vessel cylinder section structure as shown in Figure 3.

The carbon fiber wound circumferentially outward corrugated pressure vessel shell section structure formed by this embodiment, the aluminum alloy pressure vessel shell section lining does not change the hydrogen storage capacity, and is reinforced by the circumferentially outward corrugated structure, and the carbon fiber epoxy resin composite material layer It is used to further strengthen the circumferential outer corrugated barrel section lining of the aluminum alloy pressure vessel, so that the barrel section structure of this type of hydrogen storage pressure vessel has a higher load-bearing capacity, and at the same time has a lighter weight and better fatigue resistance, etc. Excellent performance.

Matters not covered in the present invention are all known technologies.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (9)

1. The utility model provides a carbon fiber winding circumference outer ripple pressure vessel shell ring structure which characterized in that: the shell ring structure comprises a metal circumferential outer corrugated shell ring lining and a carbon fiber epoxy resin composite material layer wound on the outer corrugations of the metal circumferential outer corrugated shell ring lining to a certain thickness.

2. The method for preparing the carbon fiber wound circumferentially external corrugated pressure vessel shell ring structure according to claim 1, characterized in that the method comprises the following steps:

s1, rolling and forming a metal circumferential external corrugated shell ring lining;

s2, pretreating the inner surface and the outer surface of the metal circumferential outer corrugated shell ring lining;

s3, winding a metal circumferential outer corrugated shell ring lining by carbon fibers to form a carbon fiber epoxy resin composite material layer;

and S4, curing and forming the carbon fiber epoxy resin composite material layer.

3. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 2, characterized in that: in the step S1, a rolling mill used in the process of rolling and forming the metal circumferential external corrugated shell ring lining is a special corrugated rolling mill, a driving roller of the special corrugated rolling mill is a corrugated roller, and a core roller of the special corrugated rolling mill is a cylindrical roller.

4. The method for preparing the cylindrical shell structure of the carbon fiber wound circumferential external corrugated pressure vessel as claimed in claim 2, wherein the method comprises the following steps: in step S1, the corrugated topography function of the metal circumferential outer corrugated shell ring liner is a cosine function:

y＝A cos(2πx/T)

in the formula: a is the function amplitude; t is the function period.

The amplitude A of the parameters of the morphology function is smaller than or equal to the average thickness of the metal circumferential outer corrugated shell section lining, and the length of the shell section lining is integral multiple of the function period T.

5. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 2, characterized in that: in the step S2, after the inner surface and the outer surface are pretreated, the surface roughness value of the inner surface of the circumferential outer corrugated shell ring liner of the metal is 3.2 microns, and the surface roughness of the outer corrugations is controlled to be 6.3 microns.

6. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 2, characterized in that: in the step S3, the winding mode of carbon fiber winding is non-geodesic wire winding, and a dry winding process is adopted, so that the pre-dipped carbon fiber bundle is melted by a heating device and then wound on the outer corrugated wall of the metal circumferential outer corrugated shell ring lining.

7. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 6, wherein the method comprises the following steps: the carbon fiber bundle is composed of a plurality of carbon fiber yarns, and the thickness of the carbon fiber bundle is 0.2-0.3mm.

8. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 6, wherein the method comprises the following steps: the winding angle change rule of the winding of the non-geodesic wire is solved through a differential equation of the winding angle of the non-geodesic wire, and the equation is as follows:

in the formula: λ is slip coefficient; alpha is a winding angle; r is a radius of gyration; r' and r "are the first and second derivatives of the radius of gyration to the mandrel axis coordinate z, respectively.

9. The method for preparing the carbon fiber wound circumferential external corrugated pressure vessel shell ring structure according to claim 2, characterized in that: in step S4, the curing temperature of the curing molding is more than or equal to 70 ℃, and the curing time is 20-30 minutes.

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