JP2008169893A - Pressure vessel and method for manufacturing the same - Google Patents

Abstract

A pressure vessel with improved impact resistance while suppressing an increase in weight.
A high-pressure tank (1) having a cylindrical body (10), the body (10) being on a fiber reinforced resin layer (4) and an outer peripheral surface of the fiber reinforced resin layer (4). And a grid-like reinforcing layer (5) formed in the above. The grid-like reinforcing layer (5) includes a first reinforcing layer (51) composed of a belt-like portion (51a) wound at a predetermined pitch in the circumferential direction of the body portion (10), and a belt-like shape wound at a predetermined pitch in the axial direction. The second reinforcing layer (52) wound with the portion (52a) is crossed.
[Selection] Figure 2

Description

  The present invention relates to a pressure vessel applicable to, for example, a high-pressure hydrogen tank of a fuel cell system, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, as a pressure vessel for high-pressure hydrogen used in a fuel cell system, a resin inner shell having a gas barrier property is covered with a pressure resistant FRP outer shell. Such a resin pressure vessel has been reduced in weight and is suitable for use in a fuel cell vehicle. On the other hand, FRP is more brittle than metal. For this reason, when a pressure vessel receives a local impact in a state where an internal pressure is applied, a crack due to the impact may propagate to the entire vessel and eventually burst (rupture).

As a conventional pressure vessel, for example, the one described in Patent Document 1 is known. This pressure vessel is formed so as to cover all of the plurality of vessel components and the pressure vessel main body in which a plurality of vessel components having the outer peripheral surface of the cylindrical liner covered with the primary fiber reinforced resin layer are arranged in parallel. A belt-shaped secondary fiber reinforced resin layer. The secondary fiber reinforced resin layer has an in-plane winding layer and a helical winding layer in addition to a hoop winding layer straddling a plurality of container structures.
JP 2006-38156 A (FIG. 1)

  In the pressure vessel described in Patent Document 1, when a crack occurs in the primary fiber reinforced resin layer due to a local impact, the secondary fiber reinforced resin layer cannot suppress the progress of the crack. However, a part of the hoop winding layer is formed so as to float from the surface of the container structure, and the arrangement of the secondary fiber reinforced resin layer on the surface of the container structure is biased. Since it is such a structure, there exists a possibility that the progress of the crack which generate | occur | produced in the primary fiber reinforced resin layer cannot be stopped effectively.

  An object of the present invention is to provide a pressure vessel capable of improving impact resistance while suppressing an increase in weight and a method for manufacturing the same.

  In order to achieve the above object, the pressure vessel of the present invention has a cylindrical body part, and the body part is formed in a lattice shape on the outer surface of the fiber reinforced resin layer and the fiber reinforced resin layer. And a grid-like reinforcing layer.

  According to such a configuration, even if a crack occurs in the fiber reinforced resin layer due to a local impact in the body portion of the pressure vessel, the crack does not easily propagate beyond the lattice region of the lattice reinforcing layer. Therefore, the impact resistance of the pressure vessel can be improved. In addition, since the lattice-shaped reinforcing layer is a reinforcing layer that increases in a lattice shape, an increase in weight can be suppressed as compared with the case where the entire surface is increased in thickness.

  Preferably, the grid-like reinforcing layer includes a first reinforcing layer formed by forming a plurality of band-like portions extending in the circumferential direction of the trunk portion at a predetermined pitch in the axial direction of the trunk portion, and extending in the axial direction of the trunk portion. It is good to provide the 2nd reinforcement layer formed by forming two or more strip | belt-shaped parts to carry out by the predetermined | prescribed pitch in the circumferential direction of a trunk | drum.

  According to such a configuration, the lattice regions are formed side by side at a constant pitch on the body of the pressure vessel. As a result, the degree of crack propagation does not vary greatly depending on the crack direction and the generation position. Therefore, impact resistance can be improved efficiently.

  More preferably, the second reinforcing layer is formed on the outer peripheral surface of the fiber reinforced resin layer, and the first reinforcing layer is formed so as to be laminated on the outer surface side of the second reinforcing layer.

  Preferably, the thickness of the first reinforcing layer and the second reinforcing layer is smaller than the thickness of the fiber reinforced resin layer. More preferably, the thickness of the first reinforcing layer is 0.2 to 0.3 times the thickness of the fiber reinforced resin layer, and the thickness of the second reinforcing layer is 0.1 times the thickness of the fiber reinforced resin layer. It is good to be -0.2 times.

  According to such a configuration, it is not necessary to increase the thickness of the entire body portion while improving the impact resistance. Thereby, the increase in the volume and weight of a pressure vessel can be suppressed.

  Preferably, each belt-like portion of the first reinforcing layer and each belt-like portion of the second reinforcing layer may be formed with a thickened portion thicker than both end portions in the width direction at the center portion in the width direction. More preferably, the width of each band-shaped portion is not less than twice the width of the thickened portion.

  Preferably, the lattice-shaped reinforcing layer is formed by curing the resin of the fiber impregnated with the resin.

  In order to achieve the above object, the pressure vessel manufacturing method of the present invention in which the cylindrical body portion of the pressure vessel has a liner portion, first, a fiber impregnated fiber is hoop-wrapped around the outer peripheral surface of the liner portion by a filament winding method. And it winds helically and forms a pre fiber reinforced resin layer. Next, a pre-lattice reinforcing layer made of fibers impregnated with resin is formed on the outer peripheral surface of the pre-fiber reinforced resin layer. Then, each resin of the pre-fiber reinforced resin layer and the pre-lattice-like reinforcing layer is cured by heating to form the fiber-reinforced resin layer and the lattice-like reinforcing layer on the outer peripheral surface of the liner portion.

  According to such a method, not only the fiber reinforced resin layer but also the lattice-like reinforcing layer is formed on the outer peripheral surface of the liner portion. Therefore, as described above, the fiber reinforced resin layer that can be generated by local impact on the trunk portion is formed. Propagation of the crack to the outside of the lattice region of the lattice reinforcing layer can be preferably suppressed. Therefore, a pressure vessel excellent in impact resistance can be manufactured. Moreover, each resin of the pre-fiber reinforced resin layer and the pre-grid-like reinforcing layer can be cured by heating all together. Thereby, compared with the case where each resin is hardened | cured separately, the delamination between a fiber reinforced resin layer and a lattice-shaped reinforcement layer can also be suppressed suitably.

  Preferably, the pre-lattice reinforcing layer includes a pre-first reinforcing layer and a pre-second reinforcing layer. The first pre-reinforcing layer has a plurality of belt-shaped portions formed at a predetermined pitch in the axial direction of the trunk portion by hoop winding the fiber impregnated with resin on the outer peripheral side of the pre-fiber reinforced resin layer by the filament winding method. Good. The pre-second reinforcing layer may be positioned between the pre-first reinforcing layer and the pre-fiber reinforced resin layer. By providing a fiber impregnated with resin by a hand lay-up method, a plurality of belt-shaped portions are formed in the body. It is good to form with the predetermined pitch in the circumferential direction of a part.

  According to this method, the pre-lattice reinforcing layer can be formed by a simple method.

  According to the pressure vessel of the present invention, it is possible to suppress the development of a crack that can be generated by a local impact, and to improve the impact resistance. Moreover, the increase in the weight by a lattice-like reinforcement layer can be suppressed suitably.

  Hereinafter, a pressure vessel and a manufacturing method thereof according to preferred embodiments of the present invention will be described with reference to the accompanying drawings. Here, a pressure vessel applied to a high pressure tank of a fuel cell system will be described as an example.

FIG. 1 is a view showing a fuel cell vehicle equipped with a pressure vessel according to the present embodiment.
The fuel cell vehicle 100 is equipped with a fuel cell system 200 having a fuel cell 104. In the fuel cell system 200, for example, three high-pressure tanks 1 are mounted on the rear part of the vehicle body. The fluid in each high-pressure tank 1 is a combustible fuel gas such as hydrogen gas or compressed natural gas, and is supplied to the fuel cell 104 through the gas supply line 102. Below, hydrogen gas is demonstrated to an example as fuel gas which high pressure tank 1 stores.

  Note that the high-pressure tank 1 can be applied not only to fuel cell vehicles but also to vehicles such as electric vehicles and hybrid vehicles, as well as various moving objects (for example, vehicles such as ships, airplanes, and robots) and stationary types.

2 is a perspective view of the high-pressure tank 1, and FIG. 3 is a cross-sectional view of the high-pressure tank 1 (III-III cross-sectional view of FIG. 2).
The high-pressure tank 1 includes a sealed tank body 2. The tank body 2 includes a hollow liner 3 in which a storage space R is formed, a fiber reinforced resin layer 4 that covers the outer surface of the liner 3, and a lattice-shaped reinforcing layer 5 that covers the outer surface of the fiber reinforced resin layer 4. Have.

  The storage space R can store a normal pressure fluid, and can store fuel gas at a pressure higher than the normal pressure (ie, high pressure). In the storage space R, for example, hydrogen gas of 35 MPa or 70 MPa is stored. The temperature of the high-pressure tank 1 varies with the filling and releasing of hydrogen gas, but the variation range varies depending on the filling pressure of the hydrogen gas. The temperature of the high-pressure tank 1 at the time of hydrogen gas discharge becomes lower as the filling pressure becomes higher.

  The tank body 2 has openings 6 and 7 through which hydrogen gas is supplied / discharged at the center of both ends in the longitudinal direction. Valve assemblies and plugs (not shown) are directly connected to the openings 6 and 7 by screw connection or the like. Alternatively, a base (not shown) is provided in the openings 6 and 7 by insert molding or the like, and a valve assembly or the like is screwed and connected through the base. The valve assembly and the external gas supply line 102 are connected, and hydrogen gas is supplied to and discharged from the storage space R. One of the openings 6 and 7 can be omitted.

  The tank main body 2 includes a substantially cylindrical body portion 10 and hemispherical dome portions 11 and 12 that respectively close both end portions of the body portion 10 in the longitudinal direction. The trunk portion 10 is formed with a predetermined length so that the axial direction thereof is the longitudinal direction of the tank body 2, and has a substantially constant diameter. The openings 6 and 7 are provided at the apexes of the dome portions 11 and 12, respectively.

  The liner 3 is an inner shell of the tank main body 2, and the inner space is a storage space R. That is, the liner 3 is an inner wall layer of the trunk portion 10 and the dome portions 11 and 12. The liner 3 has a gas barrier property and suppresses permeation of hydrogen gas to the outside.

  Although the material of the liner 3 is not specifically limited, For example, it forms using a hard resin other than a metal other than a polyethylene resin, a polypropylene resin, etc. In addition, the liner 3 may be configured as a laminate composed of a plurality of layers by combining these resins into two or more layers. The thickness of the liner 3 depends on the material, the dimensional shape of the high-pressure tank 1, the required pressure resistance, etc., but is not particularly limited, and is preferably about 0.5 mm to several tens of mm, more preferably about 1 mm to 10 mm. It is.

  The fiber reinforced resin layer 4 and the lattice-shaped reinforcing layer 5 are outer shells of the tank body 2 and are reinforcing layers for giving the tank body 2 pressure resistance and impact resistance. The fiber reinforced resin layer 4 covers the entire area of the outer peripheral surface of the liner 3 with a predetermined thickness. That is, the fiber reinforced resin layer 4 is provided on the trunk portion 10 and the dome portions 11 and 12. On the other hand, the lattice-like reinforcing layer 5 is formed so as to cover only the region of the trunk portion 10 in the outer peripheral surface of the fiber reinforced resin layer 4.

  The fiber reinforced resin layer 4 and the lattice-shaped reinforcing layer 5 are, for example, FRP layers in which a matrix resin (plastic) is reinforced with fibers. Examples of the matrix resin include an epoxy resin, a modified epoxy resin, an unsaturated polyester resin, a polypropylene resin, and the like. Among these, an epoxy resin or an unsaturated polyester resin is more preferable. A thermosetting resin is preferably used as the matrix resin.

  As the reinforcing fibers, inorganic fibers such as metal fibers, glass fibers, carbon fibers, and alumina fibers, synthetic organic fibers such as aramid fibers, or natural organic fibers such as cotton can be used. These fibers can be used alone or in combination (as mixed fibers), and among these, carbon fibers and aramid fibers are particularly preferable. In the fiber reinforced resin layer 4 and the lattice reinforcing layer 5 of the present embodiment, the same carbon fiber and resin are used.

  The content ratio of the matrix resin and the fiber in the fiber reinforced resin layer 4 and the lattice reinforcing layer 5 depends on the type of the resin and fiber, the fiber reinforcing direction, the thickness, and the like, but usually preferably the matrix resin: fiber = 10-80 volume%: 90-20 volume%, More preferably, the ratio shall be 25-50 volume%: 75-50 volume%. In addition, the fiber reinforced resin layer 4 and the lattice-shaped reinforcement layer 5 may contain appropriate additives in addition to these constituent materials.

  The fiber reinforced resin layer 4 is composed of a plurality of layers including two layers of a hoop layer 21 and a helical layer 31. The fiber reinforced resin layer 4 of the present embodiment is composed of four layers formed by alternately stacking the hoop layers 21 and the helical layers 31 on the surface of the liner 3 twice. The number of layers constituting the fiber reinforced resin layer 4 is determined according to the size and shape of the high-pressure tank 1 and the required pressure resistance, and may be, for example, 16 layers. Although the order of stacking the hoop layers 21 and the helical layers 31 is arbitrary, it is preferable to stack the hoop layers 21 and the helical layers 31 alternately.

  The thickness of the fiber reinforced resin layer 4 is set depending on the material, the size and shape of the high-pressure tank 1, the required pressure resistance, etc., but is not particularly limited, and is approximately several mm to 50 mm. The For example, when the outer diameter of the body 10 is about 300 mm, it is often set to about 20 mm.

The hoop layer 21 is formed so as to cover almost the entire body 10 only. On the other hand, the helical layer 31 is formed so as to cover almost the entire body portion 10 and the dome portions 11 and 12. That is, the hoop layer 21 is the outer surface of the body portion of the liner 3 or the outer surface of the helical layer 31. The carbon fiber is hoop-wound and the resin impregnated in the carbon fiber is cured. The hoop layer 21 configured in this manner ensures the strength in the circumferential direction of the body portion 10. On the other hand, the helical layer 31 is formed by helically winding carbon fibers around the outer surface of the dome portion of the liner 3 and the outer surface of the hoop layer 21 and curing the resin impregnated in the carbon fibers. The helical layer 31 thus configured mainly ensures the strength of the dome portions 11 and 12 and ensures the strength in the longitudinal direction of the tank 1.

FIG. 4 is a side view of the liner 3 showing how to wind the fiber.
The hoop winding in the hoop layer 21 refers to winding a carbon fiber containing a resin in the circumferential direction of the body portion 10. For example, as shown in FIG. 4A, the hoop winding rotates the liner 3 while reciprocating the supply unit 50 in the longitudinal direction of the liner 3, and supplies carbon fiber containing resin from the supply unit 50. Can be done.
Moreover, the helical winding in the helical layer 31 means winding the carbon fiber containing resin helically. For example, as shown in FIG. 4B, this helical winding rotates the liner 3 while reciprocating the supply unit 50 in the longitudinal direction of the liner 3 and the direction perpendicular thereto, and the resin is supplied from the supply unit 50. It can carry out by supplying the carbon fiber containing.

  The carbon fiber supplied from the supply unit 50 uses a method in which the carbon fiber is impregnated with the resin from when it is wound around the bobbin or the like (that is, a prepreg state). You may use the method of impregnating resin.

  Both hoop winding and helical winding can be performed using, for example, a filament winding method, a hand layup method, a tape winding method, or the like. In the present embodiment, the fiber reinforced resin layer 4 is formed by a filament winding method in which the carbon fiber bundle is wound in a predetermined direction using the supply unit 50.

  The lattice-shaped reinforcing layer 5 is formed on the outer peripheral surface of the fiber reinforced resin layer 4 in a lattice shape. The lattice-shaped reinforcing layer 5 is formed in a lattice shape in which strip-shaped portions obtained by winding carbon fibers containing a resin in a strip shape having a predetermined width are crossed vertically and horizontally. The lattice-shaped reinforcing layer 5 includes a first reinforcing layer 51 composed of a plurality of strip-shaped portions 51a and a second reinforcing layer 52 composed of a plurality of strip-shaped portions 52a.

  Each of the plurality of belt-like portions 51 a extends in the circumferential direction of the trunk portion 10, and is uniformly arranged at a predetermined pitch in the axial direction of the trunk portion 10. Further, the plurality of belt-like portions 52 a each extend in the axial direction of the trunk portion 10 and are equally arranged at a predetermined pitch in the circumferential direction of the trunk portion 10. A substantially rectangular gap 53 is defined in a region surrounded by the adjacent belt-like portions 51a, 51a, 52a, 52a. That is, a plurality of gaps 53 arranged in the vertical and horizontal directions are formed in the lattice reinforcing layer 5.

  Since such a lattice reinforcing layer 5 is laminated in contact with the outer peripheral surface of the fiber reinforced resin layer 4, the high-pressure tank 1 has, in its trunk portion 10, a lattice portion having the lattice reinforcing layer 5. The reinforcing fiber layer is additionally laminated on the fiber reinforced resin layer 4. On the other hand, since no additional reinforcing fiber layer is laminated at the position of the gap 53, the fiber reinforced resin layer 4 is exposed on the outermost layer of the high-pressure tank 1.

  Similar to the hoop layer 21, the first reinforcing layer 51 is formed by hoop winding a carbon fiber impregnated with a resin and curing the resin by heating. The hoop winding is performed by the filament winding method described above. On the other hand, the second reinforcing layer 52 is formed by providing carbon fibers impregnated with a resin by a hand lay-up method and curing the resin by heating. Since the grid-like reinforcing layer 5 is formed only on the trunk portion 10, the length of each band-like portion 52 a constituting the second reinforcing layer 52 is substantially the same as the axial length of the trunk portion 10.

  The hand lay-up method is performed by manually placing, for example, carbon fiber on the outer peripheral surface of the liner 3 and applying a resin thereon with a roller or the like, and impregnating the resin on the outer peripheral surface of the liner 3. Carbon fiber is provided. In the present embodiment, the second reinforcing layer 52 is disposed between the first reinforcing layers 51 by this method. That is, at least both ends of each band-shaped portion 52 a constituting the second reinforcing layer 52 are pressed from the outer periphery by the band-shaped portion 51 a constituting the first reinforcing layer 51. Accordingly, the second reinforcing layer 52 is prevented from being detached from the outer peripheral surface of the fiber reinforced resin layer 4.

  FIG. 5 is an enlarged cross-sectional view (enlarged cross-sectional view of a region V in FIG. 2) showing a surface layer portion (fiber reinforced resin layer 4 and lattice-shaped reinforcing layer 5) of the high-pressure tank 1. The band-shaped part 51 a and the band-shaped part 52 a are formed in contact with the surface of the fiber reinforced resin layer 4. Further, the belt-like portion 51a and the belt-like portion 52a are formed so as to intersect at a substantially right angle.

  In each of the belt-like portions 51a and 52a, the thickness of the central portion in the width direction (dimension La shown in FIG. 5) is larger than the thickness of both end portions in the width direction (dimension Lb shown in FIG. 5). That is, the strip-shaped parts 51a and 52a have the thickened part 54 formed in the center part in the width direction. The band-like parts 51a and 52a are formed so that the width of the whole band-like part (dimension Wb shown in FIG. 5) is more than twice the width of the thickened part 54 (dimension Wa shown in FIG. 5). .

  In order to form such a thickened portion 54, first, carbon fibers (including a resin) having a width corresponding to the width of the thickened portion 54 are provided in the lowermost layer of each band-shaped portion, and then a width is formed thereon. What is necessary is just to make it provide the next carbon fiber (resin is included) exceeding a direction. In addition, the width direction of a strip | belt-shaped part is a direction orthogonal to the direction and thickness direction where a strip | belt-shaped part extends long.

  Further, the thickness of the first reinforcing layer 51 and the second reinforcing layer 52 is smaller than the thickness of the fiber reinforced resin layer 4. Preferably, in the first reinforcing layer 51 and the second reinforcing layer 52, when the thickness of the fiber reinforced resin layer 4 (dimension Lc shown in FIG. 5) is 1, the thickness of the first reinforcing layer 51 is 0.2. The thickness of the second reinforcing layer 52 may be 0.1 to 0.2 times.

An example of a method for manufacturing such a high-pressure tank 1 will be briefly described.
First, the liner 3 is formed by injection molding or the like. Next, carbon fibers impregnated with resin (hereinafter simply referred to as “resin-impregnated fibers”) are hoop-wound and helically wound around the outer peripheral surface of the liner 3 by a filament winding method to form a pre-fiber reinforced resin layer. This pre-fiber reinforced resin layer becomes the fiber-reinforced resin layer 4 through the final process.

  Subsequently, the fiber impregnated with the resin is provided on the outer peripheral surface of the pre-fiber reinforced resin layer by a hand lay-up method to form a pre-second reinforcing layer. The pre-second reinforcing layer becomes the second reinforcing layer 52 through the final process. Next, the resin-impregnated fiber is hoop-wrapped on the outer surfaces of the pre-fiber reinforced resin layer and the pre-second reinforcing layer by a filament winding method to form a pre-first reinforcing layer. This pre-first reinforcing layer also becomes the first reinforcing layer 51 through the final process.

  In this way, a pre-lattice reinforcing layer composed of the pre-first reinforcing layer and the pre-second reinforcing layer is formed on the outer peripheral surface of the pre-fiber reinforced resin layer. Thereafter, as a final step, the pre-fiber reinforced resin layer and the pre-lattice reinforcing layer are heated to cure the resin contained in each layer. Thereby, the fiber reinforced resin layer 4 and the lattice-like reinforcing layer 5 are formed, and the high-pressure tank 1 is manufactured.

  The high-pressure tank 1 of the present embodiment has the following effects by providing the lattice-like reinforcing layer 5 as described above on the trunk portion 10.

  For example, when some local impact is applied to the high-pressure tank 1, the region of the gap 53 that is not additionally reinforced by the strips 51a and 52a has a relatively low impact strength, so that the region of the gap 53 cannot be formed. Cracks are likely to occur. However, even if a crack occurs in the region of the gap 53, the crack progresses once or stops at the position where the tip of the crack reaches the first reinforcing layer 51 and the second reinforcing layer 52. It becomes like this. That is, the structure in which the crack of the fiber reinforced resin layer 4 is suppressed in the lattice region of the lattice-shaped reinforcing layer 5 and the crack hardly propagates in the direction crossing the first reinforcing layer 51 and the second reinforcing layer 52. It has become. Therefore, the impact resistance of the high-pressure tank 1 can be improved, and the burst of the high-pressure tank 1 can be effectively suppressed.

  Further, since the grid-like reinforcing layer 5 which is an additional reinforcing layer is provided partially rather than the entire outer periphery of the fiber reinforced resin layer 4, the weight increase and the physique are increased as compared with the case where the additional reinforcing layer is provided on the entire surface. You can suppress the up. On the other hand, when an additional reinforcing layer is provided on the entire surface, not only does the weight increase and the size of the reinforcing layer increases, but it is difficult to obtain an effect of suppressing crack propagation as in the case of the five grid-like reinforcing layers.

  Further, since the lattice reinforcing layer 5 includes the first reinforcing layer 51 and the second reinforcing layer 52, it is possible to mitigate an impact such as a horizontal drop. Moreover, when laminating the grid-like reinforcing layer 5 on the fiber reinforced resin layer 4, simple methods such as a filament winding method and a hand lay-up method can be used. Furthermore, when the resin is heat-cured in the manufacturing process, both the fiber-reinforced resin layer 4 and the lattice-shaped reinforcing layer 5 can be heat-cured at the same time.

  The lattice-like reinforcing layer 5 can be applied to a layer other than a layer in which fibers are reinforced with a resin, but is preferably the same layer as the fiber-reinforced resin layer 4 in view of the manufacturing process described above.

It is a figure which shows the fuel cell vehicle carrying the pressure vessel which concerns on embodiment. It is a perspective view of the pressure vessel which concerns on embodiment. It is sectional drawing of the pressure vessel which concerns on embodiment. It is a side view of the liner which shows how to wind the fiber which concerns on embodiment, (A) is a figure which shows hoop winding, (B) is a figure which shows helical winding. It is sectional drawing (enlarged view of the part of the area | region V of FIG. 2) of the surface layer part of the pressure vessel which concerns on embodiment.

Explanation of symbols

1: high pressure tank (pressure vessel), 3: liner, 4: fiber reinforced resin layer, 5: lattice reinforcing layer, 10: trunk, 11, 12: dome, 51: first reinforcing layer, 51a: strip , 52: second reinforcing layer, 52a: strip-shaped portion, 53: gap, 54: thickened portion

Claims (9)

A pressure vessel having a cylindrical body,
The said trunk | drum is a pressure vessel provided with the fiber-reinforced resin layer and the grid | lattice-like reinforcement layer formed in a grid | lattice form on the outer peripheral surface of the said fiber-reinforced resin layer. The lattice reinforcing layer is
A first reinforcing layer formed by forming a plurality of belt-like portions extending in the circumferential direction of the body portion at a predetermined pitch in the axial direction of the body portion;
The pressure vessel according to claim 1, further comprising: a second reinforcing layer formed by forming a plurality of band-like portions extending in the axial direction of the trunk portion at a predetermined pitch in the circumferential direction of the trunk portion. The second reinforcing layer is formed on the outer peripheral surface of the fiber reinforced resin layer,
The pressure vessel according to claim 2, wherein the first reinforcing layer is formed so as to be laminated on an outer surface side of the second reinforcing layer.   4. The pressure vessel according to claim 2, wherein thicknesses of the first reinforcing layer and the second reinforcing layer are smaller than a thickness of the fiber reinforced resin layer. 5. The thickness of the first reinforcing layer is 0.2 to 0.3 times the thickness of the fiber reinforced resin layer,
The pressure vessel according to claim 4, wherein the thickness of the second reinforcing layer is 0.1 to 0.2 times the thickness of the fiber reinforced resin layer.   6. Each band-like portion of the first reinforcing layer and each belt-like portion of the second reinforcing layer are formed by forming thickened portions thicker than both end portions in the width direction at the center portion in the width direction. The pressure vessel according to any one of the above.   The pressure vessel according to any one of claims 1 to 6, wherein the lattice-shaped reinforcing layer is formed by curing the resin of a fiber impregnated with a resin. In a method for manufacturing a pressure vessel, wherein the cylindrical body of the pressure vessel has a liner portion,
A first step of forming a pre-fiber reinforced resin layer by hoop winding and helical winding the resin-impregnated fiber on the outer peripheral surface of the liner portion by a filament winding method;
A second step of forming a pre-lattice reinforcing layer made of a fiber impregnated with resin on the outer peripheral surface of the pre-fiber reinforced resin layer;
And a third step of curing each resin of the pre-fiber reinforced resin layer and the pre-grid-like reinforcing layer by heating to form a fiber-reinforced resin layer and a grid-like reinforcing layer on the outer peripheral surface of the liner portion. A method for manufacturing a pressure vessel. The pre-lattice reinforcing layer is
A pre-first is formed by forming a plurality of belt-like portions at a predetermined pitch in the axial direction of the body portion by hoop-wrapping a resin-impregnated fiber on the outer peripheral side of the pre-fiber reinforced resin layer by a filament winding method. A reinforcing layer;
A pre-second reinforcing layer located between the pre-first reinforcing layer and the pre-fiber reinforced resin layer, and by providing a fiber impregnated with resin by a hand lay-up method, a plurality of belt-shaped portions are The pressure vessel manufacturing method according to claim 8, further comprising: a pre-second reinforcing layer formed at a predetermined pitch in a circumferential direction of the body portion.

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