JPH1182888A - Frp pressure vessel with excellent pressure resistance and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance durability and safety by providing a means for fixing an FRP hoop layer edge in an end cover part on an FRP helical layer, and by placing the FRP hoop layer up to the end cover part across a drum edge of a liner on the FRP helical layer. SOLUTION: After a FRP helical layer is wound on a liner, a protruding part or a ring member, which is a means for fixing an FRP hoop layer edge, is placed in an end cover part on the FRP helical layer, and the FRP hoop layer is wound up to the protruding part or the ring member across a drum edge of the liner on the FRP helical layer, as a plate member of the means for fixing the FRP hoop layer edge is being fixed by the FRP hoop layer. By placing the protruding part or the ring member, which is the means for fixing the FRP hoop layer edge, on the end cover part of the FRP helical layer after the FRP helical layer is wound on the liner, reinforcement fiber wound in a circumferential direction on the FRP hoop layer is stopped by the protruding part or the ring member of the means for fixing, and the reinforcement fiber can be wound up to the end cover part of the liner without sliding in an axis direction of a vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a high pressure resistant F
The present invention relates to an RP pressure vessel, and more particularly to an FRP pressure vessel having a plastic liner used for liquefied petroleum gas and having excellent pressure resistance.

[0002]

2. Description of the Related Art Pressure vessels are used for fuels such as liquefied petroleum gas (LPG) and compressed natural gas (CNG), and for medical and disaster prevention such as air respirators. These pressure vessels include:
Mainly steel containers have been used. However, steel pressure vessels are heavy, and since these pressure vessels are often transported and used, a reduction in their weight has been strongly desired. As a solution to this demand, pressure vessels have been developed in which the outside of an aluminum alloy liner is reinforced with FRP (fiber reinforced plastic). This pressure vessel is reduced in weight by about 1/3 to 1/2 compared to a steel pressure vessel. However, there is a problem that the cost for manufacturing the aluminum alloy liner is high. For this reason, recently, a plastic liner FRP pressure vessel (FR having a FRP layer laminated on the outer surface of the liner) can be manufactured at a relatively low cost.
P pressure vessel) has been developed.

This plastic liner FRP pressure vessel 1 is composed of a plastic liner 2, an FRP helical layer 3, and an FRP hoop layer 4, as shown in FIG. This plastic liner is usually produced by a blow molding method or a rotational molding method. FRP helical layer, FR
The P hoop layer is made by the FW method (filament winding method). This FW method is a molding method in which a fiber impregnated with a resin is sequentially wound around a plastic liner while applying tension to the fiber. The FRP helical layer winds fibers mainly in the liner axial direction (longitudinal direction) to reinforce the liner mirror in the axial direction. Meanwhile, FRP
The hoop layer wraps the fibers in the circumferential direction of the liner and serves to reinforce the liner body in the radial direction.

However, the liner mirror does not have an FRP hoop layer for reinforcing in the radial direction despite the internal pressure acting in the radial direction of the liner, so that the pressure resistance in the radial direction is insufficient. Could be. In order to increase the radial pressure resistance of the liner mirror, if the reinforcing fibers of the hoop layer are wound on the mirror side beyond the body end of the liner, the reinforcing fibers slip on the curved surface of the mirror. Therefore, it is very difficult and sometimes impossible to wind.
Although the number of turns of the helical layer can be increased to increase the pressure resistance in the radial direction of the mirror portion, it is necessary to wind a large number of reinforcing fibers, thereby increasing the manufacturing time and cost of the FRP pressure vessel. And increase the weight of the container.

For this reason, an FRP pressure vessel as shown in FIG. 9 has been proposed (see Japanese Patent Application Laid-Open No. 8-219390). The FRP pressure vessel is a cylinder having a gas-barrier inner shell (liner) 11 and a pressure-resistant FRP outer shell 12 provided to cover the inner shell 11. The innermost layer (FR
P hoop layer) 12a. This innermost layer 1
By providing the FRP hoop layer on 2a, the pressure resistance in the radial direction of the liner mirror portion is increased.

As a method of manufacturing this FRP pressure vessel, a stepped portion 13 extending in the circumferential direction and having a step in the axial direction is formed on the outer peripheral surface of the mirror portion of the inner shell 11. It is disclosed that the FRP hoop layer of the innermost layer 12a is formed. This is to prevent the reinforcing fibers or the resin-impregnated reinforcing fibers from slipping when the FRP hoop layer of the innermost layer 12a is formed by the FW method.

[0007]

However, in the above-mentioned method, it is necessary to provide a stepped portion on the liner in order to form the FRP hoop layer on the innermost layer of the mirror portion of the FRP outer shell. The stepped shape of the liner causes the liner to have a notched shape. For this reason, the stepped portion of the liner becomes a stress concentration portion when an internal pressure is applied, and may cause cracking of the liner leading to leakage and breakage.

In addition, it is necessary to increase the thickness of the liner in order to provide a stepped portion on the liner.
There is a problem of increasing the weight of the pressure vessel. Further, providing the stepped portion on the liner requires considerable manufacturing time and cost. Particularly, in the case of a plastic liner that is not very high in rigidity, the liner is deformed (deflected) during the cutting process, and the cutting process is performed. This can itself be difficult. Further, when the liner and the stepped portion are manufactured by blow molding, there is a problem that the manufacturing cost of the mold increases.

Accordingly, an object of the present invention is to provide an FRP pressure vessel excellent in pressure resistance and high in safety without providing a stepped portion which causes cracking of the liner in the liner, and a method of manufacturing the same. It is assumed that. It is another object of the present invention to provide an FRP pressure vessel which can be manufactured easily and at low cost, and a method for manufacturing the same.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present inventors have disclosed that the FRP hoop layer can be easily and at low cost without damaging the liner over the body end of the liner. The present inventor has completed the present invention by intensively studying a method of providing the mirror portion of the liner, and performing a stress analysis on the influence of the FRP hoop layer by a finite element method.

According to a first aspect of the present invention, there is provided an FRP pressure vessel in which an FRP helical layer and an FRP hoop layer are sequentially laminated on the outer surface of a liner. By providing the mirror portion on the layer, the FRP hoop layer is provided on the FRP helical layer beyond the body end of the liner to the mirror portion. By providing means for fixing the end of the FRP hoop layer to the mirror portion of the FRP helical layer,
A P hoop layer can be provided on the FRP helical layer beyond the barrel end of the liner to the mirror. By the FRP hoop layer provided to the mirror part beyond the trunk end of this liner,
The pressure resistance of the mirror portion of the liner can be improved.

According to a second aspect of the present invention, the fixing means of the first aspect of the present invention comprises a plate-like member having a projection. Since the fixing means is formed of a plate-like member having a projection, the reinforcing fibers wound in the circumferential direction of the FRP hoop layer are stopped by the projection of the fixing means, and the fiber does not slip in the axial direction of the container. The hoop layer can be easily extended and wound up to the mirror portion of the liner.

According to a third aspect of the present invention, the fixing means of the first aspect comprises a ring-shaped member and a plurality of plate-shaped members, and these plate-shaped members are arranged in the axial direction of the ring-shaped member. One surface of these plate-shaped members is provided on the same plane as the inner peripheral surface of the ring-shaped member. When the fixing means has a ring-shaped member, F
The reinforcing fiber of the RP hoop layer wound in the circumferential direction is stopped by the ring-shaped member of the fixing means, and the FRP hoop layer is easily extended to the mirror portion of the liner without the fiber slipping in the axial direction of the container. Can be.

According to a fourth aspect of the present invention, in addition to the constitution of any one of the first to third aspects, the length of the FRP hoop layer exceeding the liner end of the liner is at most 0.1 mm of the liner radius. The length is 25 times as long. The length of the FRP hoop layer beyond the liner end of the liner should be at most 0.25 times the liner radius, preferably in the range of 0.04 to 0.25 times the liner radius. Thereby, the pressure resistance of the FRP pressure vessel can be effectively improved.

According to a fifth aspect of the present invention, there is provided a method of manufacturing an FRP pressure vessel excellent in pressure resistance according to the second or third aspect, wherein the FRP helical layer is wound on a liner,
The protrusion or the ring-shaped member of the fixing means at the end of the hoop layer,
The FRP hoop layer is placed on the mirror portion on the FRP helical layer, and the FRP hoop layer is fixed on the end portion of the FRP hoop layer by the FRP hoop layer while the plate member is fixed on the FRP helical layer. And winding up to the protrusion or the ring-shaped member. F on liner
After winding the RP helical layer, by arranging the protrusion or ring-shaped member of the fixing means at the end of the FRP hoop layer on the mirror portion of the FRP helical layer, the reinforcing fibers of the circumferential winding of the FRP hoop layer are Stopped by the protrusions or ring-shaped members of the fixing means, the reinforcing fibers do not slide in the axial direction of the container,
The FRP hoop layer can be easily extended and wound up to the mirror portion of the liner. Since the reinforcing fiber is wound while applying tension, the plate-like member of the fixing means is fixed between the FRP helical layer and the FRP hoop layer by the tightening force, and the fixing means does not move.

The method of the present invention is based on a conventional method (Japanese Patent Laid-Open No. Hei 8-21).
Unlike Japanese Patent No. 9390), since the liner has no notch such as a stepped shape, there is no fear of the liner cracking due to internal pressure. Further, the method of the present invention provides
Only by incorporating the fixing means during the process of the method, the FRP helical layer and the FR
An FRP pressure vessel can be manufactured by sequentially stacking P hoop layers. Therefore, the only new cost is the manufacturing cost of the fixing means, and the fixing means can be easily and inexpensively made of plastic, rubber, or the like.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing the structure of an FRP pressure vessel of the present invention, FIG. 2 is a view showing the structure of another FRP pressure vessel of the present invention, and FIG.
FIG. 4 is a view showing the structure of a P pressure vessel, and FIG.
It is a figure which shows an example of the analysis model of the stress analysis of a RP pressure vessel, and FIG. 5 is a figure which shows the stress analysis result of the FRP pressure vessel of this invention.

An FRP pressure vessel according to an embodiment of the present invention will be described with reference to FIG. FRP pressure vessel 1 of the present invention
Is a plastic liner 2, an FRP helical layer 3,
It is composed of the FRP hoop layer 4 and the FRP hoop layer 4
Is provided on the FRP helical layer 3 beyond the body end of the liner 2 to the mirror. A non-slip component 5 (fixing means) composed of a plate-like member 5b having a protrusion 5a shown in FIG. 1A is provided between the FRP helical layer 3 and the FRP hoop layer 4 in the axial direction of the FRP pressure vessel. In parallel with the FRP pressure vessel, six pieces are provided at equal intervals in the circumferential direction of the FRP pressure vessel on both sides of the head mirror section 6 and the bottom mirror section 8 of the FRP pressure vessel. It is arranged on both sides of the head mirror section 6 and the bottom mirror section 8 on the helical layer 3.
Further, by changing the positions of the projections 5a on the head mirror section 6 and the bottom mirror section 8 on the FRP helical layer 3, the length of the FRP hoop layer 4 beyond the liner end of the liner can be arbitrarily changed. it can.

For the FRP pressure vessel according to the embodiment of the present invention, a stress analysis by the finite element method was performed on the relationship between “the end position of the FRP hoop layer” and “the maximum stress in the fiber direction / the fiber tensile strength of the FRP layer”. went. The analysis conditions are as follows. The FRP pressure vessel analyzed has a radius R of 150 m.
m, the length L is about 750 mm, the body length is 480 mm, and the inner volume is about 50 liters. The liner of this container is a plastic liner, and the thickness of the liner is 5 mm. These FRPs used glass fiber reinforced plastic (GFRP). In the stress analysis by the finite element method, considering the symmetry of the FRP pressure vessel, the liner is made of elasto-plastic material, FR
The analysis was performed using the P layer as an anisotropic elastic body. At this time, the number of elements of the liner is 79, and the number of elements of the FRP layer is about 100. FIG. 4 shows an example of an analysis model in which the position of the end of the FRP hoop layer is the body end of the liner.

In the stress analysis by the finite element method, FR
Internal pressure (6.4MPa: 65kgf / c)
When m ² ) was applied, stress calculation was performed near the boundary between the liner body and the liner mirror, and the results are shown in FIG.
The horizontal axis in the figure indicates the position of the end of the FRP hoop layer (see the upper part of FIG. 5). d (the length of the FRP hoop layer beyond the liner trunk end) = 0 indicates that the end of the FRP hoop layer coincides with the trunk end of the liner, ie, the boundary between the liner trunk and the mirror. The-(minus) side of the value of d indicates that the end of the FRP hoop layer is located on the liner body side, and the + (plus) side of the value of d indicates that the end of the FRP hoop layer is located on the liner mirror side. I have. Also, d / R is "F
Length / liner radius of the RP hoop layer beyond the liner end of the liner ".

The vertical axis in the figure is “maximum stress in fiber direction / FRP”.
The ratio of "layer fiber tensile strength" is shown. The fiber direction maximum stress is the maximum stress acting on the fibers in the FRP helical layer and the FRP hoop layer. The FRP layer fiber tensile strength indicates the tensile strength of the used glass fiber. For this reason, "Maximum stress in fiber direction / FRP layer fiber tensile strength"
If the ratio exceeds 1, the fibers of these FRP layers will break. In the figure, the circles indicate the FRP helical layer,
The mark indicates “Maximum stress in fiber direction / FR” in the FRP hoop layer.
P layer fiber tensile strength ".

As shown in FIG. 5, as the end of the FRP hoop layer shifts from the barrel side of the liner to the mirror side, the FRP hoop layer becomes
The ratio of “the maximum stress in the fiber direction / the fiber tensile strength of the FRP layer” of the RP helical layer is reduced from 1 or more. And FR
The end of the P hoop layer is in the vicinity of the trunk end of the liner.
Became less than 1, and it became clear that the breakage of the fiber of the FRP helical layer was prevented.

Further, if the length of the end of the FRP hoop layer beyond the liner end of the liner exceeds 0.25 times the liner radius, the maximum stress in the fiber direction / FR of the FRP helical layer is increased.
The decrease in the ratio of "P layer fiber tensile strength" is reduced, and the effect is not more. Thus, by setting the length of the end of the FRP hoop layer beyond the body end of the liner to be at most 0.25 times the radius of the liner, the pressure resistance of the FRP pressure vessel by the FRP helical layer can be effectively improved. It turns out that it can be improved.

On the other hand, it became clear that the ratio of “the maximum stress in the fiber direction / the fiber tensile strength of the FRP layer” of the FRP hoop layer hardly changed.

Usually, according to the standard of the FRP pressure vessel (US Department of Transportation FRP Standard, etc.), the breakage of the fiber of the FRP layer is as follows.
It is defined to occur in the hoop layer. According to the result of the stress analysis, when the length of the FRP hoop layer exceeding the liner end of the liner is 0.04 times or more the radius of the liner, the ratio of "maximum fiber direction stress / FRP layer fiber tensile strength" of the FRP helical layer is reduced. , Was lower than that of the FRP hoop layer. That is, in this region, the fibers of the FRP hoop layer are more easily broken than the fibers of the FRP helical layer. Therefore, in order to satisfy this standard, the length of the FRP hoop layer beyond the liner end of the liner is preferably at least 0.04 times the liner radius.

From the results of the stress analysis by the finite element method, F
By extending the RP layer hoop layer on the FRP helical layer beyond the body end of the liner to the mirror section, it is possible to improve the pressure resistance of the FRP pressure vessel and prevent breakage of the fibers of the FRP helical layer, which is safe. It has been found that the properties and stability can be improved.

Further, the FRP according to another embodiment of the present invention
The pressure vessel will be described with reference to FIG. In the FRP pressure vessel of the present embodiment, as shown in FIG. 2 (a), the anti-slip component 5 of the fixing means at the end of the FRP hoop layer has projections 5a provided at both ends of a plate-like member 5b, This plate member 5
The projections 5a provided at both ends of the head b are disposed on both sides of the head mirror 6 and the bottom mirror 8 on the FRP helical layer. In this case, there is an effect that the time required for the work of positioning the non-slip component according to the present embodiment is half that of the anti-slip component according to the previous embodiment (see FIG. 1).

Further, the FRP according to another embodiment of the present invention
The pressure vessel will be described with reference to FIG. FIG. 3 (a)
Annular anti-slip component 10 as shown in FIG.
Can also be used. The ring-shaped non-slip component 10 includes a ring-shaped member 10a and a plurality of plate-shaped members 10b. These plate-shaped members 10b are arranged in the axial direction of the ring-shaped member 10a.
0a is provided on the same plane as the inner peripheral surface. This ring-shaped member is used as a non-slip end of the FRP hoop layer at the time of FW of the FRP hoop layer.

At this time, it is preferable that the radial height of the ring-shaped member 10a is higher than the thickness of the FRP hoop layer. This ring-shaped member can be used as a protection ring for the FRP layer of the FRP pressure vessel. That is, FRP
During use and delivery of a pressure vessel, when contacting with another pressure vessel or when the FRP pressure vessel falls,
The FRP layer of the pressure vessel can be protected.

[0030]

An embodiment of the present invention will be described with reference to FIG. The FRP pressure vessel of the present embodiment is a general household LPG having the same shape as the FRP pressure vessel of the above-described embodiment.
50 liter container (outer diameter 310mm, height 750m)
m). The liner of this pressure vessel was formed by rotational molding using high-density polyethylene as a material. At this time, the thickness of the liner was 5 mm, and the length of the liner body was 480 mm.
It is.

As shown in FIG. 1, an FRP helical layer (thickness: 0.6 mm) wound with glass fibers impregnated with a thermosetting resin (for example, epoxy resin) was formed by the FW method. Next, the length of the FRP hoop layer was set to 480 mm.
(Liner body length: conventional FRP pressure vessel), 500m
m (length 10 mm over each body end of FRP hoop layer liner: FRP pressure vessel A of the present invention) and 520 mm (length over each body end of FRP hoop layer liner at 20 mm: of the present invention) An FRP hoop layer (thickness: 1.0 mm) changed to the FRP pressure vessel B) was prepared.

Conventional FRP having a FRP hoop layer length of 480 mm
As for the RP pressure vessel, a glass fiber impregnated with a thermosetting resin was wound on the liner body from above the FRP helical layer to form an FRP hoop layer, as usual.

On the other hand, in the FRP pressure vessels A and B of the present invention, the plastic anti-slip part 5 at the end of the FRP hoop layer is parallel to the axial direction of the FRP pressure vessel, in the circumferential direction of the FRP pressure vessel, and the like. At intervals, six FRP helical layers were provided on both sides of the head mirror section 6 and the bottom mirror section 8, respectively. The projections 5a of these anti-slip components 5 are placed on the FRP helical layer at 10 mm and 20 m from the liner body end, respectively.
m. The non-slip component can be made of not only plastic but also rubber or metal products such as aluminum.

Next, the reinforcing fiber of the FRP hoop layer was wound around the plate member 5b of the anti-slip component 5 at the end of the FRP hoop layer, and the plate member 5b was fixed by the FRP hoop layer 4. Further, with the plate-like member 5b of the non-slip component 5 fixed with the FRP hoop layer 4, the reinforcing fiber of the FRP hoop layer was wound on the FRP helical layer beyond the trunk end of the liner to the protrusion 5a. . In the case of this embodiment, FRP
The hoop layer rotates the FRP pressure vessel around the axis of the horizontally provided FRP pressure vessel and winds the glass fiber impregnated with the thermosetting resin that is fed out from the lateral direction. The FRP hoop layer was wound on the FRP helical layer while the plate-like member of the anti-slip component was fixed by the fibers by placing the fiber at a predetermined position on the FRP helical layer serving as the surface and being fed out from the lateral direction. .

Thereafter, the FRP helical layer and the FRP hoop layer of the conventional FRP pressure vessel and the FRP pressure vessels A and B of the present invention were subjected to a thermosetting treatment. As a result, these FRP
The FRP helical layer and the FRP hoop layer of the pressure vessel and the non-slip component were integrally formed.

A burst test was performed on these FRP pressure vessels, and the pressure resistance was examined. The burst test is F
In order to check the presence or absence of breakage by applying the internal pressure of the RP pressure vessel, the burst pressure is usually 6.4 MPa (6 MPa) for LPG according to the specifications and guidelines of the FRP pressure vessel.
There is a pass / fail criterion that the pressure must be at least 5 kgf / cm ² ) and that the destruction must occur from the body of the pressure vessel.

As a result of the burst test, any FRP pressure
The container also has an internal pressure of 6.4 MPa (65 kgf / cm^Two) At pressure
The strength of the pressure vessel does not occur, and the pressure
I reared. However, conventional FRP pressure vessels have
Pressure 6.6MPa (67kgf / cm ^Two)
Failure mode in which the fiber in the helical layer breaks and breaks
And found to not meet the FRP pressure vessel standard
did. On the other hand, the burst pressure of the FRP pressure vessel A of the present invention
Is 7.3 MPa (74 kgf / cm^TwoThe present invention
The burst pressure of the FRP pressure vessel B is 7.4 MPa (7 MPa).
5kgf / cm^Two), Which is higher than the conventional FRP pressure vessel.
These FRP pressure vessels have excellent pressure resistance, and
Breakage from the FRP hoop layer of the body
It became clear that the specification of the power container was satisfied.

The results of the above embodiment correspond well to the results of the above-described stress analysis by the finite element method (see FIG. 5). In other words, in the case of the conventional FRP pressure vessel in which the end position d of the FRP hoop layer is 0 mm, the stress analysis shows that the FRP pressure vessel is operated when the internal pressure is 6.4 MPa (65 kgf / cm ² ).
The ratio of “the maximum stress in the fiber direction / the fiber tensile strength of the FRP layer” of the helical layer was almost 1 (1 or less), which almost corresponded to the burst pressure of the burst test of 6.6 MPa (67 kgf / cm ² ). In the case of the FRP pressure vessels A and B of the present invention (FRP hoop layer end position d is +10 mm, +20 m
m), in the stress analysis, “the maximum stress in the fiber direction / F
The ratio of "RP layer fiber tensile strength" was higher in the FRP hoop layer than in the FRP helical layer, and in the burst test, the failure occurred from the FRP hoop layer in the trunk. I have.

Based on the above results, the FRP hoop layer was
By providing the mirror portion beyond the body end of the liner on the RP helical layer, the pressure resistance of the FRP pressure vessel of the present invention can be improved. The specifications and guidelines of the FRP pressure vessel can be satisfied. That is, according to the present invention,
Not only the improvement of the pressure resistance performance of the FRP pressure vessel, but also the control of the destruction mode of the FRP pressure vessel can be easily performed.

The present invention is not limited to the present embodiment and examples. The protrusion of the non-slip member may be provided in the circumferential direction of the FRP pressure vessel in the head mirror portion and the bottom mirror portion of the FRP helical layer. 3 or more, and preferably 6 or more on both sides of the. As shown in FIGS. 6 and 7, only the protrusion member or the ring-shaped member can be fixed on the FRP helical layer on both sides of the head mirror portion and the bottom mirror portion of the FRP helical layer. For example, a hardening treatment is performed on the FRP helical layer, and these projection members or ring-shaped members are bonded thereon. Further, a plate-like member having a groove parallel to the winding direction of the FRP hoop layer can be used as a means for fixing the end of the FRP hoop layer. With this groove, the end of the FRP hoop layer is fixed without moving in the axial direction of the container.

[0041]

As described above, a non-slip component for fixing the end of the FRP hoop layer is provided between the FRP helical layer and the FRP hoop layer, and the FRP hoop layer is lined on the FRP helical layer. By providing a mirror part beyond the body end of the liner, there is no need to provide a stepped shape in the liner that may cause cracking of the liner, so it has excellent pressure resistance and safety that sufficiently satisfies pressure vessel standards This makes it possible to obtain a high FRP pressure vessel.
Further, the method of the present invention enables easy and low-cost production of an FRP pressure vessel simply by adding a non-slip component to the conventional FW method.

[Brief description of the drawings]

FIG. 1 is a view showing a structure of an FRP pressure vessel according to an embodiment and an example of the present invention, wherein (a) is a view showing a non-slip component, and (b) is a view showing a structure of the FRP pressure vessel. FIG.

FIG. 2 is a view showing a structure of an FRP pressure vessel according to another embodiment of the present invention, wherein (a) is a view showing a non-slip component, and (b) is a view showing a view of the FRP pressure vessel. is there.

FIG. 3 is a view showing a structure of an FRP pressure vessel according to another embodiment of the present invention, wherein (a) is a view showing a ring-shaped non-slip part, and (b) is a view showing a view of the FRP pressure vessel. It is.

FIG. 4 is a diagram showing an example of an analysis model for stress analysis of the FRP pressure vessel of the present invention.

FIG. 5 is a view showing a result of stress analysis of the FRP pressure vessel of the present invention.

FIG. 6 is a view showing a modification of the FRP pressure vessel of the present invention.

FIG. 7 is a view showing another modified example of the FRP pressure vessel of the present invention.

FIG. 8 is a diagram showing a cross-sectional configuration of a conventional FRP pressure vessel.

FIG. 9 is a view showing a configuration of a cross section of another conventional FRP pressure vessel.

[Explanation of symbols]

 1: FRP pressure vessel 2: Liner 3: FRP helical layer 4: FRP hoop layer 5: Non-slip part 5a: Projection 5b: Plate-like member 6: Head mirror 7: Body 8: Bottom mirror 9: Base 10: Ring-shaped non-slip part 10a: Ring-shaped member 10b: Plate-shaped member 11: Inner shell (liner) 12: Outer shell 12a: Innermost layer (FRP hoop layer) 12b: Reinforcement layer of body (FRP hoop layer) 12c: FRP helical layer 13: Stepped portion 14: Mirror portion 15 Projection member 16 Ring-shaped member

Claims (5)

[Claims] 1. An FRP helical layer and an FRP on an outer surface of a liner.
An FRP pressure vessel comprising an RP hoop layer and a RP hoop layer stacked in this order. The FRP hoop layer is fixed to the mirror portion of the FRP helical layer by providing means for fixing the end of the FRP hoop layer.
An FRP pressure vessel with excellent pressure resistance that is provided on the helical layer beyond the body end of the liner to the mirror. 2. The fixing means for fixing the end of the FRP hoop layer,
2. The pressure-resistant FRP pressure vessel according to claim 1, comprising a plate-like member having a projection. 3. The fixing means of the end of the FRP hoop layer,
Consisting of a ring-shaped member and a plurality of plate-shaped members, these plate-shaped members are provided in the axial direction of the ring-shaped member,
2. The FR with excellent pressure resistance according to claim 1, wherein one surface of said plate-shaped member is provided on the same surface as the inner peripheral surface of said ring-shaped member.
P pressure vessel. 4. The pressure resistance according to claim 1, wherein the length of the FRP hoop layer beyond the liner end of the liner is at most 0.25 times the liner radius. Excellent FRP pressure vessel. 5. The F having excellent pressure resistance according to claim 2 or 3.
A method for manufacturing an RP pressure vessel, comprising: wrapping an FRP helical layer on a liner;
The FRP hoop layer is placed on the mirror portion on the helical layer, and the FRP hoop layer is fixed on the end portion of the FRP hoop layer with the FRP hoop layer while the plate member is fixed on the FRP helical layer. And a method of manufacturing an FRP pressure vessel excellent in pressure resistance, comprising winding up to the protrusion or the ring-shaped member.