JP7318781B2 - Pressure vessel and manufacturing method thereof - Google Patents

Description

The present invention relates to a pressure vessel and its manufacturing method.

A pressure vessel in which a fiber-reinforced resin layer is formed by helically winding reinforcing fibers around a metal container body consisting of a straight body and a substantially hemispherical dome that closes both ends of the straight body, wherein the dome and the fiber A structure in which a woven fabric made of reinforced fibers as a reinforcing material is provided between the reinforced resin layer and the reinforced resin layer is conventionally known (see, for example, Patent Document 1).

JP 2004-263827 A

However, when forming the fiber-reinforced resin layer by helically winding the reinforcing fibers fed out from the manufacturing apparatus arranged in a state fixed to the container body, it is necessary to prevent the reinforcing fibers from slipping on the outer peripheral surface of the dome portion. In order to do so, it is necessary to wind the reinforcing fibers at a winding angle that passes through the geodesic line (shortest distance) of the dome portion. Therefore, there is no degree of freedom in the winding angle of the reinforcing fibers with respect to the container body, and a large amount of reinforcing fibers are required in order to obtain the desired strength, which is a factor in increasing the manufacturing cost of the pressure vessel.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure vessel and a method of manufacturing the same that can suppress an increase in manufacturing cost.

In order to achieve the above object, a first aspect of the pressure vessel according to the present invention is a dome portion including a cylindrical straight body portion and hemispherical semispherical portions integrally formed at both ends of the straight body portion. a first reinforcing portion configured by winding tape-shaped reinforcing fibers having a predetermined width on the outer peripheral surface of one of the dome portions so as to be alternately woven; and the straight body. A second reinforcing portion formed by helically winding the reinforcing fibers continuously from the first reinforcing portion on the outer peripheral surface of the dome portion, and a second reinforcing portion on the outer peripheral surface of the other dome portion continuously from the second reinforcing portion. and a third reinforcing portion configured by winding the reinforcing fibers so as to be alternately woven.

According to the first aspect, tape-shaped reinforcing fibers having a predetermined width are helically wound on the outer peripheral surface of the straight body portion, and the reinforcing fibers are alternately woven on the outer peripheral surface of the dome portion. wrapped around. Therefore, there is no risk of the reinforcing fibers slipping on the outer peripheral surface of the dome portion, so there is no need to wind the reinforcing fibers at a winding angle passing through the geodesic line (shortest distance). That is, when manufacturing a pressure vessel, there is a degree of freedom in the winding angle of the reinforcing fibers with respect to the container body (straight body), and the desired strength can be obtained with the minimum number of reinforcing fibers. Therefore, an increase in the manufacturing cost of the pressure vessel is suppressed.

Further, a pressure vessel of a second aspect according to the present invention is the pressure vessel of the first aspect, wherein the straight body portion and the dome when viewed from a direction perpendicular to the axial direction of the central axis of the vessel body The first reinforcing portion is switched to the second reinforcing portion, and the second reinforcing portion is switched to the third reinforcing portion, on the axial direction end side of the central axis from the boundary portion with the part. may be

According to the second aspect, the first reinforcing portion is switched to the second reinforcing portion on the axial end side of the central axis of the container body from the boundary portion between the straight body portion and the dome portion, and the second reinforcing portion to the third reinforcing part. Therefore, the reinforcing fibers are not alternately wound around the straight body portion. Therefore, compared to the case where the straight body portion is also wound with the reinforcing fibers alternately woven, the required amount of the reinforcing fibers is reduced, further suppressing an increase in the manufacturing cost.

A pressure vessel according to a third aspect of the present invention is the pressure vessel according to the second aspect, wherein a The first reinforcing portion is switched to the second reinforcing portion on the axially central portion side of the central axis from a specific portion on the outer peripheral surface of the hemispherical portion determined by the winding angle of the reinforcing fibers with respect to the central axis, and The feature may be that the second reinforcing portion is switched to the third reinforcing portion.

According to the third aspect, the first reinforcing portion is located on the side of the central portion in the axial direction of the central axis of the container body from the specific portion on the outer peripheral surface of the hemispherical portion determined by the winding angle of the reinforcing fiber wound around the straight body portion. to the second reinforcing portion, and from the second reinforcing portion to the third reinforcing portion. That is, the reinforcing fibers are wound at the same winding angle on the outer peripheral surface of the semispherical portion and the outer peripheral surface of the straight body portion. Therefore, the continuity when the reinforcing fibers are wound from the outer peripheral surface of the semispherical portion to the outer peripheral surface of the straight body portion and from the outer peripheral surface of the straight body portion to the outer peripheral surface of the semispherical portion is improved, and the productivity of the pressure vessel is improved.

A pressure vessel according to a fourth aspect of the present invention is the pressure vessel according to the third aspect, wherein the specified portion is the boundary and the reinforcing fiber wound at the winding angle so as to pass through the intersection of the portion and the central axis, and the virtual circumference portion passing through the virtual intersection of the outer peripheral surface of the hemispherical portion. .

According to the fourth aspect, the specific portion is a virtual circle passing through the virtual intersection of the reinforcing fiber wound at the winding angle so as to pass through the intersection of the boundary portion and the central axis and the outer peripheral surface of the hemispherical portion. It is considered to be a department. Therefore, compared to the case where the specified portion is not the virtual circumference portion, the reinforcing fibers are wound from the outer peripheral surface of the semispherical portion to the outer peripheral surface of the straight body portion and from the outer peripheral surface of the straight body portion to the outer peripheral surface of the semispherical portion. The continuity of time becomes even better. Therefore, the productivity of the pressure vessel is improved.

Further, a pressure vessel according to a fifth aspect of the present invention is the pressure vessel according to any one of the first to fourth aspects, wherein the A winding angle of the reinforcing fibers wound around the straight body portion with respect to the central axis may be within a range of 54.7 degrees±10 degrees.

According to the fifth aspect, the winding angle of the reinforcing fibers wound around the straight body portion is within the range of 54.7 degrees±10 degrees. Here, this value of "54.7 degrees" is determined by the stress in the circumferential and axial directions in the straight body. Therefore, the straight body portion is reinforced more appropriately than when the winding angle of the reinforcing fibers wound around the straight body portion is not within the range of 54.7 degrees±10 degrees.

A sixth aspect of the present invention provides a method for manufacturing a pressure vessel, comprising: a container having a cylindrical straight body portion and a dome portion including hemispherical hemispherical portions integrally formed at both ends of the straight body portion; A method for manufacturing a pressure vessel in which a main body is reinforced by winding tape-shaped reinforcing fibers having a predetermined width, comprising: a first step of winding the reinforcing fibers alternately around the outer peripheral surface of one of the dome portions; a second step of helically winding the reinforcing fibers around the outer peripheral surface of the straight body portion continuously from the first step; and the reinforcing fibers around the outer peripheral surface of the other dome portion continuously from the second step and a third step of winding in a staggered weave.

According to the sixth aspect, tape-shaped reinforcing fibers having a predetermined width are helically wound on the outer peripheral surface of the straight body portion, and the reinforcing fibers are alternately woven on the outer peripheral surface of the dome portion. wrapped around. Therefore, there is no risk of the reinforcing fibers slipping on the outer peripheral surface of the dome portion, so there is no need to wind the reinforcing fibers at a winding angle passing through the geodesic line (shortest distance). That is, when manufacturing a pressure vessel, there is a degree of freedom in the winding angle of the reinforcing fibers with respect to the container body (straight body), and the desired strength can be obtained with the minimum number of reinforcing fibers. Therefore, an increase in the manufacturing cost of the pressure vessel is suppressed.

A seventh aspect of the present invention is a pressure vessel manufacturing method according to the sixth aspect of the pressure vessel manufacturing method, wherein the The first step is switched to the second step and the second step is switched to the third step on the axial end side of the central axis from the boundary portion between the straight body portion and the dome portion. may be

According to the seventh aspect, the first step is switched to the second step and the second step is switched to the third step on the axial end side of the central axis of the container body from the boundary portion between the straight body portion and the dome portion. Switch to process. Therefore, in the straight body portion, the reinforcing fibers are not wound so as to be alternately woven. Therefore, compared to the case where the straight body portion is also wound with the reinforcing fibers alternately woven, the required amount of the reinforcing fibers is reduced, further suppressing an increase in the manufacturing cost.

A pressure vessel manufacturing method according to an eighth aspect of the present invention is the pressure vessel manufacturing method according to the seventh aspect, wherein when viewed from a direction perpendicular to the axial direction of the central axis of the container body, From the first step to the second step from a specific portion on the outer peripheral surface of the hemispherical portion determined by the winding angle with respect to the central axis of the reinforcing fiber wound around the straight body portion to the central portion side in the axial direction of the central axis. A feature of switching and switching from the second step to the third step may be provided.

According to the eighth aspect, from the first step on the side of the central portion in the axial direction of the central axis of the container body from the specific portion on the outer peripheral surface of the dome portion determined by the winding angle of the reinforcing fiber wound around the straight body portion. Switching to the second process and switching from the second process to the third process. That is, the reinforcing fibers are wound at the same winding angle on the outer peripheral surface of the semispherical portion and the outer peripheral surface of the straight body portion. Therefore, the continuity when the reinforcing fibers are wound from the outer peripheral surface of the semispherical portion to the outer peripheral surface of the straight body portion and from the outer peripheral surface of the straight body portion to the outer peripheral surface of the semispherical portion is improved, and the productivity of the pressure vessel is improved.

Further, a pressure vessel manufacturing method of a ninth aspect according to the present invention is the pressure vessel manufacturing method of the eighth aspect, wherein the specific portion is arranged in a direction orthogonal to the axial direction of the central axis of the container body. viewed from above, the reinforcing fiber wound at the winding angle so as to pass through the intersection of the boundary and the central axis, and the virtual circumference passing through the virtual intersection of the outer peripheral surface of the hemispherical portion. may be

According to the ninth aspect, the specific portion includes the reinforcing fiber wound at the winding angle so as to pass through the intersection of the boundary portion and the central axis, and the virtual circumference portion passing through the virtual intersection with the outer peripheral surface of the hemispherical portion. It is Therefore, compared to the case where the specified portion is not the virtual circumference portion, the reinforcing fibers are wound from the outer peripheral surface of the semispherical portion to the outer peripheral surface of the straight body portion and from the outer peripheral surface of the straight body portion to the outer peripheral surface of the semispherical portion. The continuity of time becomes even better. Therefore, the productivity of the pressure vessel is improved.

A pressure vessel manufacturing method according to a tenth aspect of the present invention is the pressure vessel manufacturing method according to any one of the sixth to ninth aspects, wherein When viewed from the direction, the reinforcing fiber wound around the straight body may have a winding angle with respect to the central axis of 54.7 degrees ±10 degrees.

According to the tenth aspect, the winding angle of the reinforcing fibers wound around the straight body portion is within the range of 54.7 degrees±10 degrees. Here, this value of "54.7 degrees" is determined by the stress in the circumferential and axial directions in the straight body. Therefore, the straight body portion is reinforced more appropriately than when the winding angle of the reinforcing fibers wound around the straight body portion is not set within the range of 54.7 degrees±10 degrees.

The dome portion includes a cylindrical portion protruding toward the axial end side of the central axis of the container body. An imaginary tangent line passing through the terminal end of the hemispherical portion of the curved surface portion connecting to the portion has an angle with respect to the central axis that is equal to or less than the winding angle with respect to the central axis of the reinforcing fiber wound around the straight body portion. may be

According to this, it becomes easy to wind the reinforcing fibers around the outer peripheral surface of the hemispherical portion at a winding angle with respect to the outer peripheral surface of the straight body portion, and the outer peripheral surface of the straight body portion and the outer periphery of the straight body portion can be easily wound from the outer peripheral surface of the hemispherical portion. The continuity is further improved when the reinforcing fibers are wound from the surface to the outer peripheral surface of the hemispherical portion. Therefore, the productivity of the pressure vessel is improved.

ADVANTAGE OF THE INVENTION According to this invention, it is a pressure vessel. WHEREIN: The increase in manufacturing cost can be suppressed.

It is a front view which shows typically the pressure vessel which concerns on this embodiment. It is a sectional view showing typically the structure of the pressure vessel concerning this embodiment. 2 is a view taken along line AA in FIG. 1, showing a cross section of reinforcing fibers in the dome portion of the pressure vessel according to the present embodiment; FIG. FIG. 2 is a view taken along the line BB in FIG. 1, showing a cross section of reinforcing fibers in the straight body portion of the pressure vessel according to the present embodiment; It is a front view which expands and shows the boundary part of the dome part and straight body part of the pressure vessel which concerns on this embodiment. FIG. 4 is a front view showing another enlarged boundary portion between the dome portion and the straight body portion of the pressure vessel according to the present embodiment. FIG. 4 is a front view showing an enlarged boundary portion between a dome portion and a straight body portion of a container body that constitutes the pressure vessel according to the present embodiment; FIG. 3 is a schematic diagram showing a manufacturing apparatus for winding reinforcing fibers around a container body that constitutes the pressure vessel according to the present embodiment. (A) is a schematic diagram showing the feeding position of the reinforcing fiber when winding it around the dome portion of the pressure vessel according to the present embodiment. (B) is a schematic diagram showing the feeding position of the reinforcing fiber when winding it around the straight body portion of the pressure vessel according to the present embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The arrow X in FIG. 1 indicates the side away from the center O of the pressure vessel 10 (container body 12) in the axial direction of the central axis CL of the pressure vessel 10. ”. Conversely, the side closer to the center O of the pressure vessel 10 (container body 12) is defined as the "axial central portion side". The pressure vessel 10 according to the present embodiment is filled with, for example, hydrogen as a fuel, and is installed in a fuel cell vehicle (not shown) or the like.

As shown in FIGS. 1 and 2, a pressure vessel 10 has a vessel body 12 called a liner. The container body 12 is, for example, blow-molded from a liquid crystal resin material having excellent gas barrier properties and excellent dimensional stability. and dome portions 16, 18 including substantially hemispherical hemispherical portions 16A, 18A.

The pressure vessel 10 is constructed by wrapping tape-shaped reinforcing fibers 20 having a predetermined width in layers around the outer peripheral surface of the straight body portion 14 and the outer peripheral surfaces of the dome portions 16 and 18 . More specifically, the reinforcing fiber 20 is made of FRP (Fiber Reinforced Plastics) containing glass fiber, carbon fiber, aramid fiber, or the like, and an FRP layer as a fiber reinforced resin layer is formed on the outer peripheral surface of the container body 12. It is designed to

Specifically, as shown in FIGS. 1 and 3 , reinforcing fibers 20 are alternately wound around the outer peripheral surface of one dome portion 16 (hereinafter referred to as “braiding”). The braiding-wound reinforcing fibers 20 form the first reinforcing portion 26, which is an FRP layer.

Similarly, on the outer peripheral surface of the other dome portion 18, the reinforcing fibers 20 are wound so as to be alternately woven (hereinafter sometimes referred to as “braiding winding”), and the braiding winding is performed. A third reinforcing portion 28, which is an FRP layer, is formed by the reinforcing fibers 20. As shown in FIG.

Further, as shown in FIGS. 1 and 4, the reinforcing fibers 20 are helically wound around the outer peripheral surface of the straight body portion 14 (hereinafter sometimes referred to as "helical winding"). The helically wound reinforcing fibers 20 form a second reinforcing portion 24 which is an FRP layer.

As shown in FIG. 5, helical winding refers to winding the reinforcing fibers 20 around the entire outer peripheral surface of the straight body portion 14 at a predetermined winding angle θ (−θ) with respect to the central axis CL of the container body 12. , and further means that the reinforcing fibers 20 are wound at a predetermined winding angle θ (+θ) with respect to the central axis CL of the container body 12 (over the reinforcing fibers 20 wound at the angle −θ). That is, the second reinforcing portion 24 is formed by winding the reinforcing fibers 20 at least twice around the outer peripheral surface of the straight body portion 14 at predetermined winding angles -θ and +θ.

Braiding winding is, as described above, winding in a staggered weave, and winding at a predetermined winding angle −θ and winding angle +θ with respect to the central axis CL of the container body 12. point to In other words, both braiding winding and helical winding are wound at the same winding angle θ, and the winding angle θ is within the range of θ = 54.7 degrees ± 10 degrees, preferably =54.7 degrees ±5 degrees, more preferably θ = 54.7 degrees ±1 degree.

The winding angle θ is an angle derived from the stress when a predetermined internal pressure acts on the straight body portion 14, and the stress in the circumferential direction is twice the stress in the axial direction. is the angle caused by That is, although detailed calculation formulas are omitted, when the winding angle θ corresponding to the stress is calculated according to the netting theory, tan ² θ=2, so θ=54.7 degrees (equilibrium angle) is derived.

In addition, since the dome portions 16 and 18 have less stress than the straight body portion 14 when the internal pressure is applied, the degree of reinforcement required is smaller than that of the straight body portion 14 . Therefore, the dome portions 16 and 18 are braided with a lower strength than the helical winding, and the straight body portion 14 is helically wound with a higher strength than the braiding.

Further, as shown in FIG. 5, the portions where the first reinforcing portion 26 is switched to the second reinforcing portion 24 are the straight body portion 14 and the straight body portion 14, respectively, when viewed from the direction orthogonal to the axial direction of the central axis CL of the container body 12. It forms a boundary portion 22 (on a first imaginary circumference portion 32 described later) with the dome portion 16 . However, the portion where the first reinforcing portion 26 is switched to the second reinforcing portion 24 is not limited to this.

For example, as shown in FIG. 6, when viewed from the direction perpendicular to the axial direction of the central axis CL of the container body 12, the boundary 22 between the straight body portion 14 and the dome portion 16 is closer to the axial end (one point). The first reinforcing portion 26 may be switched to the second reinforcing portion 24 at the portion indicated by the chain line T). The boundary portion 22 here refers to the first imaginary circumference portion 32 passing through the imaginary boundary point Ks (the point where the curvature disappears) between the straight body portion 14 and the dome portion 16 .

Further, as shown in FIGS. 5 and 6, the portion where the first reinforcing portion 26 is switched to the second reinforcing portion 24 is the straight body portion when viewed from the direction orthogonal to the axial direction of the central axis CL of the container body 12. It is axially central from a specific portion 30 on the outer peripheral surface of the hemispherical portion 16A determined by the winding angle θ (±θ) of the reinforcing fiber 20 wound around the center axis CL with respect to the central axis CL.

The specified portion 30 referred to here is the first imaginary circumferential portion 32 and the central axis of the reinforcing fibers 20 wound at the winding angle θ when viewed from the direction orthogonal to the axial direction of the central axis CL of the container body 12. A second imaginary circumference passing through the imaginary intersection point Kp between the edge portion 20B of the reinforcing fiber 20A (indicated by dots) through which the edge portion 20B on the axial end side passes through the intersection point Cp with CL and the outer peripheral surface of the hemispherical portion 16A It points to the top of section 34 .

5 and 6, the portion where the first reinforcing portion 26 is switched to the second reinforcing portion 24 is between the second virtual circumference portion 34 and the first virtual circumference portion 32 (specific portion 30 on the axial center side, and on the axial end side from there including the boundary portion 22 ). Although illustration is omitted, the same applies when the second reinforcing portion 24 is switched to the third reinforcing portion 28 .

Further, as shown in FIG. 2, the dome portions 16 and 18 include cylindrical portions 16B and 18B that protrude toward the ends in the axial direction of the central axis CL of the container body 12 at their axial centers. As an example, one cylindrical portion 16B is fitted with a sealing plug 46, and the other cylindrical portion 18B is fitted with a base plug 48. The base plug 48 is fitted with a valve. (not shown) is attached.

As shown in FIG. 7, when viewed from the direction orthogonal to the axial direction of the central axis CL of the container body 12, the curved surface portion 36 extending from the cylindrical portion 16B to the hemispherical portion 16A of the dome portion 16 has a The angle α of the imaginary tangent line Kt passing through the terminal end Np with respect to the central axis CL is less than or equal to the winding angle θ (α≦θ) with respect to the central axis CL of the reinforcing fiber 20 wound around the straight body portion 14 .

Note that the dome portion 18 is also the same. That is, the angle α with respect to the central axis CL of the imaginary tangent line Kt passing through the end Np on the side of the hemispherical portion 18A of the curved surface portion 38 (see FIG. 2) extending from the cylindrical portion 18B to the hemispherical portion 18A in the dome portion 18 is It is equal to or less than the winding angle θ (α≦θ) with respect to the central axis CL of the reinforcing fiber 20 to be wound. In addition, the term "terminus Np" referred to here includes an inflection point between the curved surface portion 36 and the semispherical portion 16A and an inflection point between the curved surface portion 38 and the semispherical portion 18A.

Further, as shown in FIG. 8 , the reinforcing fibers 20 are wound around the outer peripheral surface of the container body 12 by a known manufacturing device 40 . As shown in FIG. 9, the manufacturing apparatus 40 has a plurality of bobbins 42, 44 arranged in two rows on the circumference, and the reinforcing fibers 20 unwound from the plurality of bobbins 42, 44 in each row. is wound in order on the outer peripheral surface of one dome portion 16, the outer peripheral surface of the straight body portion 14, and the outer peripheral surface of the other dome portion 18 of the container body 12 moving in the axial direction of the central axis CL (left direction in FIG. 8). It is becoming more and more.

When braiding the reinforcing fibers 20 on one dome portion 16 and the other dome portion 18, as shown in FIG. A plurality of bobbins 44 connected with each other are arranged in the circumferential direction alternately radially inwardly and radially outwardly. While the plurality of bobbins 42 connected by the solid lines and the plurality of bobbins 44 connected by the virtual lines move in opposite directions, the respective bobbins 42 and 44 move from the radially inner side to the radially outer side. The manufacturing apparatus 40 is driven so as to sequentially switch from the radially outer side to the radially inner side.

Further, when the reinforcing fibers 20 are helically wound around the straight body portion 14, as shown in FIG. 44 are arranged circumferentially and radially outwardly and radially inwardly. The manufacturing apparatus 40 is driven so that the plurality of bobbins 42 connected by solid lines and the plurality of bobbins 44 connected by virtual lines move in opposite directions.

Next, the operation of the pressure vessel 10 according to this embodiment configured as described above will be described.

As shown in FIGS. 8 and 9 , the pressure vessel 10 according to this embodiment is constructed by winding reinforcing fibers 20 around the outer peripheral surface of the vessel body 12 . That is, the reinforcing fibers 20 are sequentially fed from the plurality of bobbins 42 and 44, and the reinforcing fibers 20 are braided around the outer peripheral surface of one dome portion 16 to form the first reinforcing portion 26 (the first reinforcing portion 26). process).

Therefore, there is no risk that the reinforcing fibers 20 will slip on the outer peripheral surface of the one dome portion 16, so there is no need to wind the reinforcing fibers 20 at a winding angle passing through the geodesic line (shortest distance). In other words, when manufacturing the pressure vessel 10, there is a degree of freedom in the winding angle of the reinforcing fibers 20 around the container body 12 (straight body portion 14), and the desired strength can be obtained with the minimum number of reinforcing fibers 20 necessary. Therefore, in the pressure vessel 10, an increase in manufacturing cost and an increase in mass can be suppressed.

When the braiding winding of the reinforcing fibers 20 on the outer peripheral surface of one dome portion 16 is completed, subsequently, the reinforcing fibers 20 are helically wound on the outer peripheral surface of the straight body portion 14 to form the second reinforcing portion 24 ( second step). It should be noted that the switching from the braiding winding in the dome portion 16 to the helical winding in the straight body portion 14 is performed between the second virtual circumference portion 34 (specific portion 30) and the first virtual circumference portion 32 (boundary portion 22). in the region E between.

Here, the second imaginary circumference portion 34 includes an imaginary intersection point Kp determined by the optimum winding angle θ of the reinforcing fiber 20 with respect to the straight body portion 14 . Therefore, in the region E, the reinforcing fibers 20 can be smoothly switched from the braiding winding to the helical winding at the same winding angle θ. That is, the continuity when the reinforcing fibers 20 are wound from the outer peripheral surface of the semispherical portion 16A to the outer peripheral surface of the straight body portion 14 is improved, and the productivity of the pressure vessel 10 can be improved.

Further, in the dome portion 16, the angle α with respect to the central axis CL of the imaginary tangent line Kt passing through the end Np on the side of the hemispherical portion 16A in the curved surface portion 36 connecting from the cylindrical portion 16B to the hemispherical portion 16A is the reinforcing fiber wound around the straight body portion 14. 20 with respect to the central axis CL (see FIG. 7).

Therefore, the reinforcing fibers 20 are easily wound around the outer peripheral surface of the semispherical portion 16A at the winding angle θ with respect to the outer peripheral surface of the straight body portion 14, and the reinforcing fibers 20 are easily wound from the outer peripheral surface of the semispherical portion 16A to the outer peripheral surface of the straight body portion 14. The continuity when winding 20 is further improved, and thus the productivity of the pressure vessel 10 can be further improved.

In addition, since the straight body portion 14 is helically wound instead of being braided, the required amount of the reinforcing fibers 20 can be reduced compared to the case where the straight body portion 14 is also braided. . Therefore, in the pressure vessel 10, an increase in manufacturing cost and an increase in mass can be further suppressed. In addition, since the reinforcing fibers 20 are not bent in the straight body portion 14, the strength of the second reinforcement portion 24, which requires the most strength, is appropriately ensured (the straight body portion 14 is appropriately reinforced). can do).

After the helical winding of the reinforcing fibers 20 on the outer peripheral surface of the straight body portion 14 is completed, subsequently, the reinforcing fibers 20 are braided on the outer peripheral surface of the other dome portion 18 to form the third reinforcing portion 28 ( 3rd step). Therefore, there is no risk that the reinforcing fibers 20 will slip on the outer peripheral surface of the other dome portion 18, so that it is not necessary to wind the reinforcing fibers 20 at a winding angle passing through the geodesic line (shortest distance).

Therefore, similarly to the above, in the pressure vessel 10, an increase in manufacturing cost and an increase in mass can be suppressed. The switching from the helical winding on the straight body portion 14 to the braiding winding on the dome portion 18 also involves in the region E between.

Here, the second imaginary circumference portion 34 includes an imaginary intersection point Kp determined by the optimum winding angle θ of the reinforcing fiber 20 with respect to the straight body portion 14 . Therefore, in the region E, the reinforcing fibers 20 can be smoothly switched from helical winding to braiding winding at the same winding angle θ. That is, the continuity when the reinforcing fibers 20 are wound from the outer peripheral surface of the straight body portion 14 to the outer peripheral surface of the hemispherical portion 18A is improved, and the productivity of the pressure vessel 10 can be improved.

Further, in the dome portion 18, the angle α with respect to the central axis CL of the imaginary tangent line Kt passing through the terminal Np on the side of the hemispherical portion 18A in the curved surface portion 38 connecting from the cylindrical portion 18B to the hemispherical portion 18A is the reinforcing fiber wound around the straight body portion 14. 20 with respect to the central axis CL is less than or equal to the winding angle θ.

Therefore, the reinforcing fibers 20 are easily wound around the outer peripheral surface of the semispherical portion 18A at the winding angle θ with respect to the outer peripheral surface of the straight body portion 14, and the reinforcing fibers 20 are easily wound from the outer peripheral surface of the straight body portion 14 to the outer peripheral surface of the semispherical portion 18A. The continuity when winding 20 is further improved. Therefore, productivity of the pressure vessel 10 can be further improved.

The winding angle θ of the reinforcing fibers 20 wound around the straight body portion 14 is set within the range of 54.7°±10°. That is, this "54.7 degrees" is an angle (equilibrium angle) derived from stress when a predetermined internal pressure acts on the straight body portion 14 . Also, "±10 degrees" is a tolerance allowed when the reinforcing fibers 20 are actually wound. Therefore, the straight body portion 14 can be reinforced more appropriately than when the winding angle θ of the reinforcing fibers 20 wound around the straight body portion 14 is not within the range of 54.7 degrees ±10 degrees. can.

Thus, when the reinforcing fibers 20 are wound around the container body 12 to form the first reinforcing portion 26, the second reinforcing portion 24 and the third reinforcing portion 28, the first reinforcing portion 26, the second reinforcing portion 24 and the third reinforcing portion 24 are formed. The reinforcing fibers 20 forming the reinforcing portion 28 are impregnated with a thermosetting resin and heated to be cured. As a result, it is possible to obtain the pressure vessel 10 that is excellent in corrosion resistance, is lightweight and inexpensive, and is easy to transport and handle.

As described above, the pressure vessel 10 according to the present embodiment has been described based on the drawings, but the pressure vessel 10 according to the present embodiment is not limited to the illustrated one, and can be used within the scope of the present invention. , the design can be changed as appropriate. For example, the container body 12 is not limited to being made of liquid crystal resin.

The container body 12 may be made of other synthetic resin having gas barrier properties such as high-density polyethylene, or may be made of lightweight metal such as aluminum alloy. Further, the container body 12 is not limited to one manufactured by blow molding, and may be manufactured by injection molding or the like.

REFERENCE SIGNS LIST 10 pressure vessel 12 container body 14 straight body portion 16 dome portion 16A semispherical portion 16B cylindrical portion 18 dome portion 18A semispherical portion 18B cylindrical portion 20 reinforcing fiber 22 boundary portion 24 second reinforcing portion 26 first reinforcing portion 28 third reinforcing portion 30 Identification part 34 Second virtual circumference part (virtual circumference part)
36 curved surface portion 38 curved surface portion CL center line Cp intersection point Kp virtual intersection point Kt virtual tangent line Np terminal end α angle θ winding angle

Claims (8)

a container body having a cylindrical straight body portion and a dome portion including hemispherical hemispherical portions integrally formed at both ends of the straight body portion;
a first reinforcing portion configured by winding tape-shaped reinforcing fibers having a predetermined width around the outer peripheral surface of one of the dome portions so as to be alternately woven;
a second reinforcing portion configured by helically winding the reinforcing fibers around the outer peripheral surface of the straight body portion continuously from the first reinforcing portion;
a third reinforcing portion configured by winding the reinforcing fibers continuously from the second reinforcing portion around the outer peripheral surface of the other dome portion so as to be alternately woven;
with
When viewed from the direction orthogonal to the axial direction of the central axis of the container body, from the boundary portion between the straight body portion and the dome portion to the axial direction end portion side of the central axis, from the first reinforcing portion to the second reinforcing portion. A pressure vessel switching to a reinforcement and switching from said second reinforcement to said third reinforcement . When viewed from the direction perpendicular to the axial direction of the central axis of the container body, the distance from the specific portion on the outer peripheral surface of the hemispherical portion determined by the winding angle with respect to the central axis of the reinforcing fiber wound around the straight body portion to the center 2. The pressure vessel according to claim 1, wherein the first reinforcing portion is switched to the second reinforcing portion and the second reinforcing portion is switched to the third reinforcing portion on the axially central portion side of the shaft. The specific portion includes the reinforcing fiber wound at the winding angle so as to pass through the intersection of the boundary portion and the central axis when viewed in a direction perpendicular to the axial direction of the central axis of the container body; 3. The pressure vessel according to claim 2 , which is an imaginary circular portion passing through an imaginary intersection with the outer peripheral surface of the hemispherical portion . A winding angle of the reinforcing fibers wound around the straight body portion with respect to the central axis is within a range of 54.7°±10° when viewed from a direction perpendicular to the axial direction of the central axis of the container body . The pressure vessel according to any one of claims 1 to 3. Pressure for reinforcing a container body having a cylindrical straight body portion and a dome portion including hemispherical hemispherical portions integrally formed at both ends of the straight body portion with tape-shaped reinforcing fibers having a predetermined width wound around the body. A method for manufacturing a container,
a first step of winding reinforcing fibers alternately around the outer peripheral surface of one of the dome portions;
a second step of helically winding the reinforcing fibers around the outer peripheral surface of the straight body portion continuously from the first step;
a third step of winding the reinforcing fibers around the outer peripheral surface of the other dome portion so as to be alternately woven continuously from the second step;
has
From the first step to the second step on the axial direction end side of the central axis from the boundary portion between the straight body portion and the dome portion when viewed from the direction perpendicular to the axial direction of the central axis of the container body. and switching from the second step to the third step . When viewed from the direction perpendicular to the axial direction of the central axis of the container body, the winding angle of the reinforcing fibers wound around the straight body portion with respect to the central axis is determined by the winding angle from the specific portion on the outer peripheral surface of the hemispherical portion to the central axis. 6. The method of manufacturing a pressure vessel according to claim 5, wherein the first step is switched to the second step and the second step is switched to the third step on the axially central portion side of the . The specific portion includes the reinforcing fiber wound at the winding angle so as to pass through the intersection of the boundary portion and the central axis when viewed from a direction orthogonal to the axial direction of the central axis of the container body, and the hemispherical portion. 7. The method of manufacturing a pressure vessel according to claim 6 , wherein the imaginary circumference portion passes through an imaginary intersection with the outer peripheral surface of the . 6. A winding angle of the reinforcing fibers wound around the straight body portion with respect to the central axis is within a range of 54.7 degrees±10 degrees when viewed from a direction perpendicular to the axial direction of the central axis of the container body. The method for manufacturing a pressure vessel according to any one of claims 7 to 7 .