阅读说明：本技术 高压储罐 (High-pressure storage tank ) 是由 渡边秀夫 金崎俊彦 于 2020-08-21 设计创作，主要内容包括：本发明提供一种高压储罐。构成高压储罐(10)的内胆(12)具有随着靠向端部而收缩的收缩部(13a、13b)、圆筒形状部(15)、介于收缩部与圆筒形状部(15)之间的弯曲部(14a、14b)。在内胆(12)上安装有接头(20)。在该接头(20)上形成有用于进行流体供排的供排孔(18),并且设置有介于内胆(12)和加强层(16)之间的凸缘部(30)。在凸缘部(30)与加强层(16)之间配设有保护部件(50)。并且,在弯曲部与加强层(16)之间夹装有多孔材料(94)。据此,能够使进入到内胆与加强层之间的气体通过该内胆的弯曲部与加强层之间而从两者之间排出,并且能够避免内胆变形。(The invention provides a high-pressure storage tank. An inner tank (12) constituting a high-pressure tank (10) has constricted portions (13a, 13b) that constrict toward end portions, a cylindrical portion (15), and bent portions (14a, 14b) interposed between the constricted portions and the cylindrical portion (15). A joint (20) is mounted on the inner container (12). A supply/discharge hole (18) for supplying/discharging fluid is formed in the joint (20), and a flange portion (30) interposed between the inner bag (12) and the reinforcing layer (16) is provided. A protective member (50) is disposed between the flange section (30) and the reinforcing layer (16). And a porous material (94) is sandwiched between the bent portion and the reinforcing layer (16). Accordingly, the gas entering between the inner liner and the reinforcing layer can be discharged from between the bending portion of the inner liner and the reinforcing layer through the space between the bending portion of the inner liner and the reinforcing layer, and the deformation of the inner liner can be avoided.)

1. A high-pressure tank (10) having a resin inner tank (12), a reinforcing layer (16) and a joint (20), wherein the reinforcing layer covers an outer surface of the inner tank; the joint (20) is provided with a supply and discharge hole (18) for supplying and discharging fluid to the inner container,

it is characterized in that the preparation method is characterized in that,

the inner container has a contracting portion (13a, 13b), a cylindrical portion (15), and a bending portion (14a, 14b), wherein the contracting portion contracts toward an end portion; the bent portion is interposed between the constricted portion and the cylindrical shape portion,

the joint has a flange portion (30) and a cylindrical portion (32), wherein the flange portion is interposed between the inner bladder and the reinforcing layer; the cylindrical portion is connected to the flange portion and exposed to the outside of the reinforcing layer,

a protective member (50) is disposed between the flange portion and the reinforcing layer, and the protective member is filled in a gap between the flange portion and the reinforcing layer,

a porous material (94) is sandwiched between the bend and the reinforcing layer.

2. The high pressure tank of claim 1,

the joint and the protection member are provided to the constricted portion, and the porous material extends from the bent portion to the protection member.

3. The high pressure tank of claim 2,

the porous material has a smaller thickness than the protective member at a butt contact portion between the porous material and the protective member.

4. According to claimThe high-pressure tank as recited in any one of claims,

a portion of the protective member enters between the inner bladder and the reinforcing layer.

5. According to claimThe high-pressure tank as recited in any one of claims,

the surface of the porous material facing the reinforcing layer is subjected to a water repellent treatment.

6. According to claimThe high-pressure tank as recited in any one of claims,

the porous material is comprised of a strip.

7. According to claimThe high-pressure tank as recited in any one of claims,

the reinforcing layer applies a pressing force to the inner bladder, and the pressing force is maximum at the bending portion.

8. The high pressure storage tank of claim 7,

the reinforcing layer is made of a fiber-reinforced resin that is wound around the cylindrical portion in a hoop winding manner and that is wound around the bent portion in a spiral winding manner.

Technical Field

The invention relates to a high pressure tank (high pressure tank) with a liner, a reinforcement layer and a joint.

Background

High-pressure tanks are widely used as containers for storing fluids such as gas and liquid. For example, the fuel cell system is mounted on a fuel cell vehicle as a device for storing hydrogen gas to be supplied to the fuel cell system.

As such a high-pressure tank, there is known a high-pressure tank having a resin inner tank, a reinforcing layer, and a joint, wherein the inner tank accommodates a fluid in a hollow interior thereof; the reinforcing layer is made of fiber reinforced resin for reinforcing the inner container and covering the outer surface of the inner container; the joint is provided with a supply and discharge hole for supplying and discharging fluid to the hollow inner part of the inner container. As shown in fig. 1 of japanese patent application laid-open No. 2009-174700, both longitudinal end portions of the inner bladder are constricted portions, and the constricted portions form cylindrical portions therebetween. Further, a curved portion having an arc-shaped cross section is interposed between the cylindrical portion and the constricted portion.

However, in the high-pressure tank having the above-described structure, when the inner liner is filled with high-pressure hydrogen gas, the hydrogen gas permeates through the inner liner (hereinafter, the gas such as hydrogen gas that has permeated through the inner liner is also referred to as "permeated gas"), and enters between the inner liner and the reinforcing layer. In view of the above, japanese patent laid-open publication No. 2009-174700 proposes to form a ventilation layer between the inner container and the reinforcing layer in order to discharge the permeated gas from between the inner container and the reinforcing layer. The air-permeable layer is formed as an inner layer portion of a fiber-reinforced resin serving as a reinforcing layer, for example. According to Japanese patent laid-open publication No. 2009-174700, in particularThe above paragraph describes that the thickness of the fibers on the inner side of the combined winding, which are suppressed from spreading, is increased as compared with the fibers on the outer side, which are sufficiently spread and spirally wound, whereby the air-permeable layer having the voids along the fibers on the inner side can be obtained.

Disclosure of Invention

The reinforcing layer is produced by winding a fiber-reinforced resin around the inner container by a fiber winding method. In order to prevent the inner container from expanding when being filled with high-pressure gas, the reinforced fibers are tensioned as much as possible. Therefore, the inner container is pressed from the fiber reinforced resin toward the inside of the inner container.

Here, the degree of tension of the reinforcing fibers is set to be maximum at the bent portion. This is because the curved portion has an arc-shaped cross section, and therefore tends to be loosened if the curved portion is not wound with helical winding having a larger tightening force than hoop winding. Therefore, the pressing force applied to the inner bag is maximized at the bending portion. Therefore, as described in japanese patent application laid-open No. 2009-174700, when the inner layer portion of the fiber-reinforced resin is used as the air-permeable layer, the air-permeable layer may be crushed from the outer layer at the bent portion.

When this occurs, the flow path of the permeated gas is blocked at the bent portion. That is, it is difficult to discharge the permeated gas that has permeated through the cylindrical portion from the constricted portion through the bent portion. In other words, the permeation gas is easily trapped between the liner and the reinforcing layer. Since the permeated gas has a high pressure, when the hydrogen gas in the inner container is consumed and the internal pressure of the inner container is lowered, the inner container is pushed by the permeated gas. As a result, the inner container may be deformed.

The main object of the present invention is to provide a high-pressure tank capable of allowing gas introduced between an inner liner and a reinforcing layer to pass between a bent portion of the inner liner and the reinforcing layer and be discharged from between the inner liner and the reinforcing layer.

Another object of the present invention is to provide a high-pressure tank capable of preventing deformation of an inner tank.

According to an aspect of the present invention, there is provided a high-pressure tank having a resin inner tank, a reinforcing layer, and a joint, wherein the reinforcing layer covers an outer surface of the inner tank; a supply/discharge hole for supplying and discharging fluid to and from the inner container is formed in the joint, and in the high-pressure tank, the inner container has a constricted portion, a cylindrical portion, and a curved portion, wherein the constricted portion is constricted as it approaches an end portion; the curved portion is interposed between the constricted portion and the cylindrical portion, and the joint has a flange portion and a cylindrical portion, wherein the flange portion is interposed between the inner bladder and the reinforcing layer; the cylindrical portion is connected to the flange portion and exposed to the outside of the reinforcing layer, a protective member filled in a gap between the flange portion and the reinforcing layer is disposed between the flange portion and the reinforcing layer, and a porous material is interposed between the bent portion and the reinforcing layer.

According to the present invention, the porous material is interposed between the reinforcement layer and the bent portion at which the pressing force of the reinforcement layer against the inner bladder is maximized. Since the porous material includes open pores, in the case where a fluid enters between the bent portion and the reinforcing layer, the fluid can circulate through the open pores. That is, the fluid can be discharged from between the bend portion and the reinforcing layer through the space therebetween. Therefore, it is possible to effectively prevent the fluid from being accumulated between the bending portion and the reinforcing layer or the inner bladder from being deformed as a result of the accumulated fluid pressing the inner bladder.

Further, the inner liner internal pressure (protection residual pressure) for preventing the inner liner from being deformed by the retained fluid can be reduced, whereby the amount of the remaining fluid in the high-pressure storage tank can be reduced. Therefore, when the fluid is hydrogen gas, for example, the cruising distance of a fuel cell vehicle equipped with a high-pressure accumulator can be increased.

The above objects, features and advantages will be readily understood by the following description of the embodiments with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic side sectional view of a high-pressure tank according to an embodiment of the present invention as a whole along a longitudinal direction (axial direction).

Fig. 2 is an enlarged view of a main portion of fig. 1.

Detailed Description

Hereinafter, the high-pressure tank according to the present invention will be described in detail with reference to the accompanying drawings by referring to preferred embodiments.

Fig. 1 is a schematic side sectional view of the high-pressure tank 10 according to the present embodiment as a whole along the longitudinal direction (axial direction). The high-pressure tank 10 includes an inner tank 12 made of a resin material such as Polyamide (PA) resin. The inner container 12 is a hollow body and can accommodate various fluids such as hydrogen gas therein.

The inner tube 12 includes a first constricted portion 13a, a first bent portion 14a, a cylindrical portion 15, a second bent portion 14b, and a second constricted portion 13b in this order from the left to the right in fig. 1. The first and second constricted parts 13a and 13b are closed ends that are constricted and arched toward the longitudinal ends of the inner bag 12. The cylindrical portion 15 is an elongated tubular body, and each end portion in the longitudinal direction thereof is connected to the first constricted portion 13a and the second constricted portion 13b via the first bent portion 14a and the second bent portion 14 b. The inner bag 12 is covered with a reinforcing layer 16 from the first constricted portion 13a to the second constricted portion 13 b.

The first constricted portion 13a and the second constricted portion 13b are provided with joints 20 in which supply and discharge holes 18 are formed, respectively. Referring to fig. 2, specifically describing the first constricted part 13a by way of example, a recessed part 22 recessed toward the inside of the inner container 12, in other words, toward the cylindrical part 15 is formed on the top surface of the first constricted part 13 a. A cylindrical portion 24 is formed to protrude from the recessed portion 22 in a direction away from the cylindrical portion 15. The outer peripheral wall of the cylindrical portion 24 is provided with male screws 26.

The joint 20 is made of, for example, metal, and has a flange portion 30 and a tube portion 32, wherein the flange portion 30 is interposed between the inner bladder 12 and the reinforcing layer 16; the cylindrical portion 32 is integrally connected to the flange portion 30 and has a smaller diameter than the flange portion 30. The bottom surface of the flange portion 30 is a liner-side abutment end surface 34 that abuts the outer surface of the recessed portion 22, and the back surface of the liner-side abutment end surface 34 is a reinforcing-layer-covered end surface 36 that is covered with the reinforcing layer 16 together with the liner 12. The outer peripheral edge of the flange portion 30 is cut out in the axial direction of the tube portion 32 from the liner-side abutment end surface 34 to the reinforcing-layer-covering end surface 36. Thus, flat sides 38 are formed at the sides of the joint 20. The flat side surface 38 has a predetermined length in the axial direction of the cylindrical portion 32.

A first corner 40 is formed by the intersection of the bladder-side abutment end surface 34 and the flat side surface 38, and a second corner 42 is formed by the intersection of the flat side surface 38 and the reinforcing-layer-covering end surface 36. The first corner 40 faces the inner bag 12 and the second corner 42 faces the reinforcing layer 16. The first corner portion 40 and the second corner portion 42 are both obtuse angles, that is, an intersection angle θ 1 between the liner-side abutment end surface 34 and the flat side surface 38 and an intersection angle θ 2 between the flat side surface 38 and the reinforcement-layer-covering end surface 36 are both obtuse angles.

By forming the flat side surface 38, an annular gap 44 is formed as a space surrounded by the flat side surface 38, the liner 12, and the reinforcing layer 16. As described later, the annular gap 44 is filled with a part of the protective member 50.

The supply/discharge hole 18 extends from the flange portion 30 to the cylindrical portion 32. An internal thread 52 is formed on the inner peripheral wall of the supply/discharge hole 18, and the external thread 26 is screwed with the internal thread 52. By this screwing, the joint 20 is externally fitted to the cylindrical portion 24.

A seal groove 54 having an annular recess is formed on the upstream side of the female screw 52 in the fluid supply direction. A seal member 56 formed of an O-ring is disposed inside the seal groove 54. The sealing member 56 seals between the outer peripheral surface of the cylindrical portion 24 and the inner peripheral surface of the supply/discharge hole 18.

The joint 20 is also formed with an insertion hole 60 and a joint-side passage 62 each having a circular cross-sectional shape. The insertion hole 60 extends from the inner-container-side contact end surface 34 of the flange portion 30 toward the tube portion 32 by a predetermined length, and communicates with one end side of the joint-side passage 62. The insertion holes 60 and the joint-side passages 62 are provided in plurality at regular intervals in the circumferential direction of the joint 20.

A plug (plug)64 is inserted into the insertion hole 60. The plug 64 is, for example, a cylindrical body formed of the same metal as the header 20, and a plug-side passage 66 is formed to penetrate therethrough in the axial direction. The joint-side passage 62 is connected to the plug-side passage 66, extends inside the joint 20 at a slight inclination with respect to the axial direction of the high-pressure tank 10, and then bends toward the inner circumferential surface of the supply/discharge hole 18. These plug-side passage 66 and joint-side passage 62 function as a fluid guide passage for guiding the fluid introduced between the inner bag 12 and the joint 20 to the supply/discharge hole 18.

A collar 72 is also provided inside the supply/discharge hole 18. The collar 72 is made of, for example, metal, and has an annular head 74 and a cylindrical portion 76, wherein the cylindrical portion 76 is provided integrally with the head 74 and has a smaller diameter than the head 74. The cylindrical portion 24 is sandwiched between the outer peripheral surface of the cylindrical portion 76 and the inner peripheral surface of the supply/discharge hole 18 of the flange portion 30, and is thereby firmly supported. Further, a through hole 80 communicating with the supply/discharge hole 18 is formed in the collar 72 so as to penetrate in the axial direction of the cylindrical portion 76.

Further, a protective member 50 is disposed between the flange portion 30 and the reinforcing layer 16. The protective member 50 has an annular main body 84 and an annular protrusion 86, wherein the annular main body 84 is formed in a substantially annular shape; the annular protrusion 86 protrudes from the annular body 84 and has a substantially triangular cross section. As understood from fig. 2, the annular protrusion 86 protrudes from the end surface of the annular main body portion 84 facing the liner 12 toward the liner 12.

The annular projection 86 enters the annular gap 44 and abuts the flat side surface 38 of the joint 20 and the inner container 12. That is, the annular protrusion 86 is filled in the annular gap 44.

The width of one annular body 84 is wider than the width of the annular projection 86. Therefore, the annular main body portion 84 includes: a first clamped portion 88 which enters between the flange portion 30 of the joint 20 and the reinforcing layer 16; and a second clamped portion 90 that enters between the inner bladder 12 and the reinforcing layer 16. In other words, the first clamped portion 88 is filled in the small gap between the flange portion 30 and the reinforcing layer 16, and the second clamped portion 90 is filled in the small gap between the inner bladder 12 and the reinforcing layer 16. Therefore, the protective member 50 is firmly positioned and fixed by the inner bag 12, the reinforcing layer 16, and the joint 20.

Although shown exaggerated in fig. 2, the thickness of the annular body portion 84 is extremely small. Therefore, the step formed by the second clamped portion 90 and the inner container 12 is extremely small. Therefore, it is possible to avoid stress acting on the reinforcing fibers when the reinforcing fibers are wound around the inner bag 12 to form the reinforcing layer 16.

The protective member 50 configured as described above can be manufactured by injection molding molten polyethylene, for example.

As shown in detail in fig. 2, a porous tape 94, which is a porous material, is interposed between the inner bag 12 and the reinforcing layer 16 from a portion of the cylindrical portion 15 located near the first bent portion 14a to the second clamped portion 90 of the protective member 50. That is, the porous strip 94 is interposed between the first bend 14a and the reinforcing layer 16. The porous tape 94 is made of, for example, an elongated film body of porous polytetrafluoroethylene resin. Such a porous tape 94 is readily available.

Porous strip 94 is an elongated, soft strip that can be easily wrapped around liner 12. In addition, the porous tape 94 is a porous body in which open pores are connected to each other in three dimensions in the thickness direction and the length direction. Therefore, the fluid (for example, permeated gas) permeating through the inner container 12 can flow through the open pores.

The end of the porous strip 94 on the side facing the second clamped portion 90 of the protective member 50 is in abutting contact with the second clamped portion 90. The thickness of the porous strip 94 including the abutting contact portion is set to be smaller than the second clamped portion 90 of the protective member 50.

In addition, the end face of the porous tape 94 on the side facing the reinforcing layer 16 is subjected to waterproofing treatment. By the water-repellent treatment, not only moisture but also the resin having a hydrophilic group is repelled by the porous tape 94.

The second constricted portion 13b also has the same structure as the above structure. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. Further, the middle portion of the cylindrical portion 15 is not wound with the porous tape 94.

The reinforcing layer 16 covering the inner bag 12 is made of a fiber-reinforced resin. The reinforcing layer 16 is provided by winding reinforcing fibers around the inner container 12 and then impregnating the matrix resin in the reinforcing fibers. As typical preferable examples of the reinforcing fiber and the matrix resin, carbon fiber and epoxy resin can be cited, respectively.

In manufacturing the high-pressure tank 10, a porous material is provided on the first bent portion 14a and the second bent portion 14b of the inner tank 12 provided with the joint 20 and the protective member 50. When the porous tape 94 made of the film body as described above is used as the porous material, the porous tape 94 may be wound. In this way, in the case of using the porous strip 94, it is possible to easily provide the porous material on the first curved portion 14a and the second curved portion 14 b.

Typically, the porous strip 94 is wound as many turns as necessary in such a manner as to extend from the vicinity of the first bend 14a or the second bend 14b to each of the second clamped portions 90 of the 2 protective members 50. Further, at the abutting contact portion of the porous strip 94 and the protective member 50, the number of windings and the degree of overlap of the porous strip 94 are set in such a manner that the thickness of the porous strip 94 is smaller than the thickness of the protective member 50.

The outer surface of the porous tape 94 is subjected to waterproofing at this time. For this purpose, for example, a waterproof spray can be sprayed. Alternatively, the waterproofing treatment may be performed before the porous tape 94 is wound.

Next, the reinforcing fiber impregnated with the resin (hereinafter also referred to as "impregnated fiber") is wound around the outer sides of the inner container 12, the joint 20, the protective member 50, and the porous belt 94 by a known filament winding method. At this time, the impregnated fiber is wound in a hoop winding manner on the cylindrical portion 15 of the liner 12, and is wound in a spiral winding manner on the first bent portion 14a, the first constricted portion 13a, the second bent portion 14b, and the second constricted portion 13 b. This is because, as described above, if the first bent portion 14a, the first contracted portion 13a, the second bent portion 14b, and the second contracted portion 13b are wound in the hoop winding manner, the impregnated fiber is easily loosened.

Thus, the impregnated fiber is tensioned at the first bend 14a and the second bend 14 b. As a result, as shown exaggeratedly in fig. 2, the thickness of the impregnated fiber is reduced at the portions located outside the first bent portion 14a and the second bent portion 14 b. Therefore, the pressing force applied from the impregnated fiber (reinforcing layer 16) to the inner bag 12 is maximized at the first bent portion 14a and the second bent portion 14 b.

As described above, the porous tape 94 is subjected to the water repellent treatment. Thus, the porous strip 94 repels the resin contained in the impregnating resin. Therefore, the open pores of the porous tape 94 can be prevented from being clogged with the resin.

In addition, the second clamped portion 90, which is a part of the protective member 50, enters between the inner bladder 12 and the reinforcing layer 16. Therefore, since the step between the joint 20 and the reinforcing layer 16 is filled, the impregnating resin is caught and tightened on the step, and as a result, damage can be avoided.

After the winding of the impregnating resin is completed, heating is performed, for example. Accordingly, the resin is cured, thereby forming the reinforcing layer 16 as a laminate.

The high-pressure tank 10 according to the present embodiment is basically configured as described above, and the operational effects thereof will be described next.

When a fluid such as hydrogen gas is stored in the high-pressure tank 10, the fluid is supplied to the hollow interior of the inner container 12 through the supply/discharge hole 18 of the cylindrical portion 24 and the through hole 80 of the collar 72. At this time, the inner bag 12 slightly inflates due to the increase in the internal pressure. On the other hand, when the stored fluid is discharged, the fluid is discharged from the hollow interior of the inner container 12 through the through hole 80 of the collar 72 and the supply/discharge hole 18 of the cylindrical portion 24. As the internal pressure of inner bag 12 decreases, inner bag 12 contracts slightly.

As the fluid is supplied and the inner container 12 is inflated, a load is applied to the flange portion 30 of the joint 20. This load is removed by the contraction of the inner bladder 12 as fluid is expelled. Therefore, by repeating the supply and discharge of the fluid to and from the high-pressure tank 10, the load is repeatedly applied to and removed from the flange portion 30.

In the present embodiment, as shown in fig. 2, a flat side surface 38 extending by a predetermined length is formed on the outer peripheral edge portion of the flange portion 30, and a first corner portion 40 having an obtuse angle is interposed between the liner-side abutment end surface 34 and the flat side surface 38, and a second corner portion 42 having an obtuse angle is interposed between the flat side surface 38 and the reinforcing-layer-covering end surface 36. That is, no sharp edge portion exists at the outer peripheral edge portion of the flange portion 30.

In other words, the outer peripheral edge of the flange 30 is thick. Therefore, fatigue is not easily accumulated even if the application and removal of the load are repeated. Therefore, fatigue failure is less likely to occur in the flange portion 30. That is, the possibility of fatigue failure occurring at the outer peripheral edge portion of the flange portion 30 can be eliminated.

In the present embodiment, the annular gap 44 is filled with the annular protrusion 86 of the protective member 50 (see fig. 2). Therefore, the top of the annular protrusion 86 abuts also on the abutting portion of the inner bag 12 with the first corner 40. Therefore, when the inner liner 12 is inflated, the load applied from the inner liner 12 is dispersed to the flange portion 30 and the protective member 50. That is, since stress concentration at the contact portion is avoided, fatigue failure due to accumulation of fatigue at the contact portion is avoided.

As described above, in the present embodiment, the protective member 50 is interposed between the flange portion 30 and the reinforcing layer 16 and fills the gap (including the annular gap 44) therebetween, so that the risk of fatigue failure of the inner bag 12 can be eliminated.

In addition, the protective member 50 is made of resin, and thus exhibits sufficient elasticity. Therefore, when the inner container 12 is expanded and pushes the joint 20, the protection member 50 is slightly crushed. By this crushing, the pressing force (load) from the joint 20 to the reinforcing layer 16 is alleviated. Therefore, the reaction force from the reinforcing layer 16 acting on the joint 20 becomes small. Accordingly, the load acting on the joint 20 and the reinforcing layer 16 becomes small, and therefore, damage to the joint 20 or the reinforcing layer 16 is avoided.

In addition, since the annular projection 86 is also crushed, the pressing force from the inner bag 12 and the reaction force from the reinforcing layer 16 are also relaxed at the portion of the inner bag 12 and the reinforcing layer 16 that abuts against the annular projection 86. Thus, the inner container 12 is also protected.

As a result, the inner container 12, the reinforcing layer 16, and the joint 20 are less likely to be damaged by interposing the protective member 50 having the annular protrusion 86 between the flange portion 30 and the reinforcing layer 16. That is, the high-pressure tank 10 can be configured as a tank having excellent durability.

Further, by providing the protective member 50, the porous strip 94 is prevented from moving to the joint 20 side. That is, the porous strip 94 is prevented from being displaced by the protective member 50.

When hydrogen gas is filled as a fluid into the inner container 12, the internal pressure of the inner container 12 increases. In this case, the hydrogen gas permeates the inner liner 12 and becomes a permeated gas which is trapped between the inner liner 12 and the reinforcing layer 16. As the hydrogen gas in the inner container 12 is consumed (discharged), the internal pressure decreases, and the permeated gas is released from the restraint of the hydrogen gas in the inner container 12.

Here, in the cylindrical portion 15, the pressing force applied to the inner bag 12 by the reinforcing layer 16 is small. Therefore, when the internal pressure of the inner bag 12 becomes small, the permeated gas permeated to the outside of the cylindrical portion 15 can relatively easily move to the first curved portion 14a or the second curved portion 14 b.

In contrast, the pressing force applied to the inner bag 12 by the reinforcing layer 16 is large at the first bent portion 14a or the second bent portion 14 b. This is because, as described above, the degree of tension of the impregnated resin is large in the first bent portion 14a or the second bent portion 14b, and therefore the pressing force applied to the inner bag 12 by the reinforcing layer 16 is large. Since the pressing force is large and the gap (the flow path of the permeated gas) between the first bent portion 14a or the second bent portion 14b and the reinforcing layer 16 is small, the permeated gas is not likely to pass through the first bent portion 14a or the second bent portion 14b and reach the protective member 50.

Here, in the present embodiment, the porous strip 94 is provided from the portion of the cylindrical portion 15 located near the first curved portion 14a or the second curved portion 14b to each of the second clamped portions 90 of the protective members 50 provided at both ends. Therefore, the permeated gas that has moved from the cylindrical portion 15 to the porous strip 94 flows through the three-dimensionally connected open pores present inside the porous strip 94, and reaches the protective member 50. In this way, by providing the porous strip 94 on the first curved portion 14a and the second curved portion 14b where the pressure applied from the reinforcing layer 16 to the inner bag 12 is the maximum, the permeated gas can easily flow through the first curved portion 14a and the second curved portion 14 b.

In the present embodiment, the thickness of the porous strip 94 is set to be smaller than the thickness of the second clamped portion 90 at the abutting contact portion between the porous strip 94 and the protective member 50 (second clamped portion 90). Therefore, the permeated gas passing through the open pores of the porous strip 94 can be easily introduced between the second clamped portion 90 and the inner container 12.

As shown by arrows in fig. 2, the permeated gas passes between the recess 22 of the inner container 12 and the protective member 50 (second clamped portion 90) and between the recess 22 and the inner container side abutment end surface 34, and is further guided to the supply/discharge hole 18 through the plug side passage 66 and the connector side passage 62. That is, the permeated gas merges with the hydrogen gas discharged from the inner container 12 through the supply/discharge holes 18. In this way, the permeated gas is safely discharged to the outside of the high pressure tank 10 via the plug-side passage 66 and the joint-side passage 62.

As described above, according to the present embodiment, by providing the porous material (the porous tape 94) in the first bent portion 14a and the second bent portion 14b, the permeation gas that has permeated the inner liner 12 can be easily discharged from between the inner liner 12 and the reinforcing layer 16. Therefore, even when the internal pressure of the inner bag 12 is reduced, the permeation gas trapped between the inner bag 12 and the reinforcing layer 16 can be prevented from pressing the inner bag 12. Thus, deformation of the inner container 12 is effectively prevented.

In general, in order to prevent the deformation of the inner container 12 due to the retained permeated gas, a predetermined amount of fluid (hydrogen gas or the like) is left in the inner container 12, thereby obtaining a predetermined inner container internal pressure (residual protective pressure). In contrast, in the present embodiment, as described above, the permeated gas can be easily discharged to the outside of the high-pressure tank 10, and therefore, even if the residual protective pressure is reduced, the deformation of the inner tank 12 can be avoided. Therefore, the amount of fluid remaining in the high-pressure tank 10 can be reduced. When the fluid is hydrogen gas, for example, the cruising distance of the fuel cell vehicle equipped with the high-pressure accumulator 10 can be increased.

The present invention is not particularly limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the joint 20 and the protective member 50 may be provided on the cylindrical portion 15. The number of the joint 20 and the protective member 50 may be one.

Further, the protective member may be configured without providing any one of the first clamped portion 88 and the second clamped portion 90.