JP2009243660A - High pressure tank and its method for manufacturing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide gas leak by providing a structure preventing easy abnormal deformation of a liner during filling and discharge of gas, and avoiding breaking due to repeated deformation of the liner. <P>SOLUTION: The high pressure tank is equipped with a mouthpiece part 11, the liner 20, a reinforcement layer 21 provided on an outer circumference of the liner 20, and a communication hole 70 provided in the reinforcement layer 21 or an area wherein the reinforcement layer 21 is adjacent to the mouthpiece part 11 to communicate a tank interior with a tank exterior. The communication hole 70 is a hole formed between the mouthpiece part 11 and the reinforcement layer 21 by a communication hole forming means. The communication hole forming means is, for example, a micro tube 71. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high-pressure tank and a method for manufacturing the same. More specifically, the present invention relates to an improvement in the structure of a high-pressure tank used in a fuel cell system or the like.

  As a high-pressure tank used for storing or supplying hydrogen or the like, a structure in which a valve assembly (a part incorporating a high-pressure valve or the like) is attached to a base provided at a tank opening is used.

Conventionally, as such a high-pressure tank, for example, a tank body in which the outer peripheral surface of a liner layer (inner wall layer) impregnated with resin is reinforced with a CFRP (Carbon Fiber Reinforced Plastics) layer (outer wall layer), and the longitudinal direction of the tank body What has the nozzle | cap | die part which consists of an alloy attached to the opening edge part of this is known. There is also known a high-pressure tank in which gas leaks from between a base part and, for example, a liner layer (inner wall layer) (see, for example, Patent Document 1).
Special table 2007-528473 gazette

  However, in such a high-pressure tank, gas may not easily leak from between the base and the fiber impregnated with resin under a situation where the tank internal pressure is high. In this case, the liner may be abnormally deformed when the gas is charged and released, and the liner may be damaged due to repeated deformation, resulting in a gas leak.

  Accordingly, the present invention provides a high-pressure tank and a method of manufacturing the same, in which the liner is less likely to be abnormally deformed when the gas is charged and released, and the gas leak can be suppressed by avoiding damage due to repeated deformation of the liner. Objective.

  In order to solve this problem, the present inventor has made various studies. Conventionally, a high-pressure tank is formed by, for example, FW (filament winding) molding of carbon fiber or the like in a container made of a resin liner. However, since the gas that has permeated through the resin liner accumulates between the resin liner and the outer reinforcement layer (for example, a layer made of CFRP), the resin liner may be abnormally deformed inward when the gas is released. The resin liner abnormally deformed when the gas is released in this manner is pressed again by the pressure when the gas is filled, and returns to the original state. However, if the gas is re-released, the resin liner is again deformed inward. If this phenomenon is repeated, the resin liner eventually breaks and may lead to gas leaks. The present inventor who has repeatedly studied focusing on such a phenomenon in the high-pressure tank has come to obtain new knowledge that leads to the solution of such a problem.

  The high-pressure tank according to the present invention is based on such knowledge, and includes a base part, a liner, a reinforcing layer provided on the outer periphery of the liner, and a region where the reinforcing layer or the reinforcing layer is adjacent to the base part. And a communication hole that communicates the inside of the tank and the outside of the tank.

  Furthermore, the present invention provides a method for manufacturing a high-pressure tank comprising a base part, a liner, and a reinforcing layer provided on the outer periphery of the liner, wherein the reinforcing layer or a region where the reinforcing layer is adjacent to the base part, A communication hole for communicating with the outside of the tank is formed by the communication hole forming means, and FW molding is performed in a state where the communication hole is formed.

  In the high-pressure tank described above, the gas once accumulated between the liner and the reinforcing layer is discharged to the outside of the tank through the communication hole. That is, it is difficult for gas to leak from between the base portion and the fiber impregnated with the resin, and the gas is suppressed from staying between the liner and the reinforcing layer. Therefore, the liner can be prevented from being deformed abnormally during the filling and discharging of gas, and damage due to repeated deformation of the liner can be avoided and gas leakage can be suppressed.

  The communication hole in the high-pressure tank is a hole formed between the base portion and the reinforcing layer by the communication hole forming means. The communication hole forming means is, for example, a microtube. Further, as the communication hole forming means, a material having higher gas permeability than the liner and the reinforcing layer may be used. Or the mold release agent apply | coated to the contact part of a nozzle | cap | die part and a reinforcement layer may be used as a communicating hole formation means. Alternatively, the communication hole forming means may be a groove provided in the base part.

  Further, in the high-pressure tank according to the present invention, the base portion is disposed on a valve assembly for controlling supply / discharge of gas between the gas supply path to the outside and the inside of the high-pressure tank, or on the opposite side of the valve assembly. Either one of the bosses is attached.

  According to the present invention, it is possible to prevent the liner from being deformed abnormally when the gas is charged and released in the high-pressure tank, and to prevent damage due to repeated deformation of the liner and to suppress the gas leak.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 to 21 show an embodiment of a high-pressure tank and a manufacturing method thereof according to the present invention. The high-pressure tank 1 includes a base part 11, a resin liner (liner) 20, a CFRP layer (reinforcing layer) 21 provided on the outer periphery of the resin liner 20, and the CFRP layer 21 or the CFRP layer 21 is connected to the base part 11. And a communication hole 70 that is provided in a region adjacent to the tank and communicates the inside of the tank and the outside of the tank. Below, the case where the high pressure tank 1 concerning this invention is applied to the high pressure hydrogen tank as a fuel supply source in the fuel cell system 10 is demonstrated.

  Hereinafter, first, the outline of the fuel cell system in the present embodiment will be described (see FIG. 1). This fuel cell system 10 includes a fuel cell 20, an oxidizing gas piping system 30 that supplies air (oxygen) as an oxidizing gas to the fuel cell 20, and a fuel gas piping that supplies hydrogen gas as a fuel gas to the fuel cell 20. The system includes a system 40 and a control unit 70 that performs overall control of the entire system.

  The fuel cell 20 is formed of, for example, a solid polymer electrolyte type and has a stack structure in which a large number of single cells are stacked. The single cell of the fuel cell 20 has an air electrode on one surface of an electrolyte made of an ion exchange membrane, a fuel electrode on the other surface, and a pair of separators so as to sandwich the air electrode and the fuel electrode from both sides. have. The fuel gas is supplied to the fuel gas flow path of one separator, and the oxidizing gas is supplied to the oxidizing gas flow path of the other separator, and the fuel cell 20 generates electric power by this gas supply.

  The oxidizing gas piping system 30 has a supply path 17 through which the oxidizing gas supplied to the fuel cell 20 flows, and a discharge path 12 through which the oxidizing off gas discharged from the fuel cell 20 flows. The supply path 17 is provided with a compressor 14 that takes in the oxidizing gas via the filter 13, and a humidifier 15 that humidifies the oxidizing gas fed by the compressor 14. The oxidizing off-gas flowing through the discharge path 12 is subjected to moisture exchange by the humidifier 15 through the back pressure regulating valve 16, and is finally exhausted into the atmosphere outside the system as exhaust gas.

  The fuel gas piping system 40 includes a high-pressure hydrogen tank (referred to herein as a high-pressure tank) 1 as a fuel supply source, a supply path 22 through which hydrogen gas supplied from the high-pressure tank 1 to the fuel cell 20 flows, and a fuel cell. A circulation path 23 for returning the hydrogen off-gas (fuel off-gas) discharged from 20 to the junction A of the supply path 22, a pump 24 for pumping the hydrogen off-gas in the circulation path 23 to the supply path 22, and a circulation path 23 And a discharge path 25 that is branched and connected.

  The high-pressure tank 1 is suitable, for example, as a fuel gas supply tank for a fuel cell vehicle. Although not particularly illustrated, for example, three high-pressure tanks 1 are used by being mounted on the rear portion of the vehicle body. The high-pressure tank 1 constitutes a part of the fuel cell system 10 and supplies fuel gas to the fuel cell 20 through the fuel gas piping system 40. The fuel gas stored in the high-pressure tank 1 is a combustible high-pressure gas such as hydrogen gas or compressed natural gas.

  The high-pressure tank 1 of the present embodiment is configured to be able to store hydrogen gas at a pressure of 35 MPa, for example. When the main stop valve 26 of the high-pressure tank 1 is opened, hydrogen gas flows out to the supply path 22. Thereafter, the flow rate and pressure of the hydrogen gas are adjusted by the injector 29, and then the pressure is further reduced to, for example, about 200 kPa by a mechanical pressure regulating valve 27 and other pressure reducing valves downstream and supplied to the fuel cell 20. The The main stop valve 26 and the injector 29 are incorporated in a valve assembly 50 indicated by a broken frame in FIG. 1, and the valve assembly 50 is connected to the high-pressure tank 1.

  A shutoff valve 28 is provided on the upstream side of the junction point A of the supply path 22. The hydrogen gas circulation system is configured by sequentially communicating the downstream flow path of the confluence A of the supply path 22, the fuel gas flow path formed in the separator of the fuel cell 20, and the circulation path 23. Yes. When the purge valve 33 on the discharge path 25 is appropriately opened during operation of the fuel cell system 10, impurities in the hydrogen off gas are discharged together with the hydrogen off gas to a hydrogen diluter (not shown). By opening the purge valve 33, the concentration of impurities in the hydrogen off-gas in the circulation path 23 decreases, and the concentration of hydrogen in the hydrogen off-gas supplied in circulation increases.

  The control unit 70 is configured as a microcomputer having a CPU, a ROM, and a RAM therein. The CPU executes a desired calculation according to the control program and performs various processes and controls such as a flow rate control of the injector 29. The ROM stores control programs and control data processed by the CPU. The RAM is mainly used as various work areas for control processing. The control unit 70 inputs detection signals from various pressure sensors and temperature sensors used in the gas systems (30, 40) and a refrigerant system (not shown), and outputs control signals to each component.

  Next, the structure and the like of the high pressure tank 1 will be described.

  FIG. 2 is a cross-sectional view showing a main part of the high-pressure tank 1. The high-pressure tank 1 includes, for example, a substantially ellipsoidal tank main body 10 and a base 11 attached to one end of the tank main body 10 in the longitudinal direction.

  The tank body 10 has, for example, a two-layer wall layer, and has a liner 20 as an inner wall layer and a CFRP layer 21 as a resin fiber layer (reinforcing layer) as an outer wall layer on the outer side.

  The liner 20 has substantially the same ellipsoidal shape as the tank body 10. The liner 20 is made of, for example, polyethylene resin, polypropylene resin, or other hard resin (hereinafter also referred to as a resin liner 20).

  A folded portion 30 that is bent inward is formed on the distal end side of the resin liner 20 where the cap portion 11 is provided. The folded portion 30 is folded toward the inside of the tank body 10 so as to be separated from the outer CFRP layer 21. The folded portion 30 has, for example, a reduced diameter portion 30a that gradually decreases in diameter as it approaches the folded tip, and a cylindrical portion 30b that is connected to the distal end of the reduced diameter portion 30a and has a constant diameter. An opening of the resin liner 20 is formed by the cylindrical portion 30b.

  The base part 11 has a substantially cylindrical shape and is fitted into the opening of the resin liner 20. The base portion 11 is made of, for example, aluminum or an aluminum alloy, and is manufactured in a predetermined shape by, for example, a die casting method. The base part 11 is attached to the resin liner 20 by, for example, insert molding.

  The base part 11 is formed with a flange part 11a on the tip side (outside in the axial direction of the high-pressure tank 1), for example, and, for example, on the rear side (inward in the axial direction of the high-pressure tank 1) An annular recess 11b is formed with respect to the shaft. The dent 11b is convexly curved on the shaft side and has an R shape. Similarly, the vicinity of the tip of the R-shaped CFRP layer 21 is in airtight contact with the recess 11b.

  For example, the surface of the recess 11b that comes into contact with the CFRP layer 21 is provided with a solid lubricating coating C such as a fluorine-based resin. Thereby, the friction coefficient between the CFRP layer 21 and the recessed part 11b is reduced.

  The rear side of the recessed portion 11b of the base portion 11 is formed so as to conform to the shape of the folded portion 30 of the resin liner 20, for example, and a protruding portion 11c having a large diameter is formed continuously from the recessed portion 11b. A cap portion cylindrical portion 11d having a constant diameter is formed behind the protruding portion 11c. The reduced diameter portion 30a of the folded portion 30 of the resin liner 20 is in close contact with the surface of the protruding portion 11c, and the cylindrical portion 30b is in close contact with the surface of the base portion cylindrical portion 11d. Seal members 40 and 41 are interposed between the cylindrical portion 30b and the base portion cylindrical portion 11d.

  A screw 42 for screwing and connecting the valve assembly 50 is formed on the inner peripheral surface of the base part 11. The valve assembly 50 controls the supply and discharge of fuel gas between an external gas supply line (supply path 22) and the inside of the high-pressure tank 1. Seal members 60 and 61 are interposed between the outer peripheral surface of the bubble assembly 50 and the inner peripheral surface of the base part 11.

  The CFRP layer 21 is formed, for example, by FW molding (filament winding molding), by winding reinforcing fibers impregnated with resin around the outer peripheral surface of the resin liner 20 and the recess 11b of the base 11 and curing the resin. Yes. For the resin of the CFRP layer 21, for example, an epoxy resin, a modified epoxy resin, an unsaturated polyester resin, or the like is used. Further, as the reinforcing fiber, carbon fiber, metal fiber, or the like is used.

  Furthermore, the high-pressure tank 1 of the present embodiment includes a communication hole 70 that allows the inside of the tank and the outside of the tank to communicate with each other in a region where the CFRP layer (reinforcing layer) 21 or the CFRP layer 21 is adjacent to the base 11. ing. According to such a communication hole 70, particularly when hydrogen gas is accumulated between the CFRP layer 21 and the resin liner 20, the hydrogen gas can be discharged out of the tank. That is, in the high-pressure tank 1, the hydrogen gas that has permeated through the resin liner 20 is accumulated between the resin liner 20 and the outer reinforcing layer (in this embodiment, the CFRP layer 21). The liner 20 may be deformed inward (see FIGS. 22 to 24). The resin liner 20 deformed at the time of hydrogen gas discharge is pushed back to the original pressure when the hydrogen gas is filled, and is deformed inward again when the hydrogen gas is re-released. It may lead to breakage (see FIG. 24). In this regard, in the high-pressure tank 1 of the present embodiment, the hydrogen gas that has permeated through the resin liner 20 and is likely to accumulate in the gap is discharged out of the tank through the communication hole 70 that should also be called a leak path, and the resin liner 20 is repeated. It is possible to avoid damage due to deformation. Further, even if a protective cover is attached to the high-pressure tank 1, hydrogen gas can be discharged from the neck of the base 11 to the outside of the tank, so that it is possible to prevent hydrogen gas from accumulating in the protective cover. .

  In the present specification, the outside of the tank is a region outside the outermost peripheral surface of the high-pressure tank 1, and the inside of the tank is a region inside the outermost peripheral surface of the high-pressure tank 1. Therefore, in the high-pressure tank 1 of the present embodiment, not only the gas storage part inside the resin liner 20 but also the space between the resin liner 20 and the CFRP layer 21 corresponds to “the inside of the tank”.

  Specific means for forming such a communication hole 70 is not particularly limited. For example, in the present embodiment, a microtube 71 provided between the resin liner 20 and the CFRP layer 21 is used. The microtube 71 is, for example, a small-sized test tube made of polypropylene or the like that is often used for tests and experiments such as biochemistry and molecular biology. Generally, the main body has a closed cylindrical shape or a conical shape. In general, the microtube 71 has high mechanical durability and is durable to many organic solvents. Therefore, the microtube 71 is also suitable as a communication hole forming means as in the present embodiment. It is possible to ensure the communication hole 70 under a high situation.

  Then, the manufacturing method (molding process) of the high-pressure tank 1 is demonstrated below as 1st-5th embodiment.

<First Embodiment>
The microtube 71 is disposed on the resin liner 20 having the base 11 (see FIGS. 3 and 4). Here, in this embodiment, the core material 71 a is inserted into the hollow portion of the microtube 71 so that epoxy or the like does not enter the hollow portion of the microtube 71 and block the communication hole 70 during FW molding. (See FIG. 5). The core material 71a is preferably a single material that is longer than the entire length of the microtube 71 and has flexibility. The microtube 71 in a state where the core material 71 a is inserted is along the surface of the base part 11 and the resin liner 20 with one end facing the outside of the tank along the base part 11 and the other end in contact with the resin liner 20. (See FIG. 4). It is preferable that a plurality of microtubes 71 are arranged around the base part 11 at equal intervals in the circumferential direction.

  Next, FW molding is performed, and reinforcing fibers are wound around the base part 11 and the resin liner 20 so as to be wound together with the microtubes 71 arranged as described above, thereby forming a CFRP layer (reinforcing layer) 21 (see FIG. 6). . When the resin is cured, the core material 71 a is pulled out from the microtube 71. As a result, the CFRP layer 21 or a region where the CFRP layer 21 is adjacent to the base portion 11 is formed with the communication hole 70 so that the inside of the tank and the outside of the tank are communicated.

  The high-pressure tank 1 manufactured through the above molding process is assembled as a finished product by assembling the valve assembly 50 to the base part 11 and then used as a fuel tank or the like filled with hydrogen gas or the like. For example, in the high-pressure tank 1 filled with hydrogen gas at high pressure, the hydrogen gas may permeate the resin liner 20 and temporarily accumulate in the gap between the CFRP layer 21 and the resin liner 20 (FIGS. 22 and 22). 23), according to the present embodiment, even when the tank internal pressure is high, this hydrogen gas can be discharged to the outside of the tank through the communication hole 70 formed by the microtube 71. Further, even if a protective cover (not shown) is attached to the high-pressure tank 1 (a portion around the base portion 11), hydrogen gas can be discharged from the neck of the base portion 11 to the outside of the tank. Therefore, it is possible to avoid the accumulation of hydrogen gas in the protective cover. In addition, according to the manufacturing method described above, the communication hole 70 is secured by performing normal FW molding in a state where the communication hole forming means (in the case of the present embodiment, the microtube 71) is arranged around the base portion 11 or the like. Therefore, it is easy and less troublesome. As is clear from the description so far, the communication hole 70 is sufficient as long as it can discharge the hydrogen gas accumulated in the gap between the CFRP layer 21 and the resin liner 20 to the outside of the tank. It does not have to be.

<Second Embodiment>
In the present embodiment, the communication hole 70 is formed using the thread 72. First, the yarn 72 coated with a release agent is disposed on the resin liner 20 having the base 11 (see FIG. 7). At this time, the yarn 72 is arranged so as to be along the surfaces of the base part 11 and the resin liner 20 with one end facing the outside of the tank along the base part 11 and the other end being in contact with the resin liner 20. It is preferable that a plurality of microtubes 71 are arranged around the base part 11 at equal intervals in the circumferential direction.

  Thereafter, FW molding is performed, and reinforcing fibers are wound around the base portion 11 and the resin liner 20 so as to be wound together with the yarn 72 arranged as described above, thereby forming a CFRP layer (reinforcing layer) 21 (see FIG. 8). When the resin is cured, the thread 72 is pulled out, and a communication hole 70 is formed between the resin liner 20 and the base part 11 or the CFRP layer 21 so that the tank interior and the tank exterior communicate with each other.

<Third Embodiment>
In the present embodiment, the communication hole 70 is formed using the mesh 73. First, a mesh 73 coated with a release agent is disposed on the surfaces of the base 11 and the resin liner 20 (see FIGS. 9 and 10). The mesh 73 is formed in a circumferential shape or a cylindrical shape along the surfaces of the base part 11 and the resin liner 20 so as to be covered around the base part 11, for example. The material of the mesh 73 is preferably cloth, nylon, or the like.

  Thereafter, FW molding is performed, and reinforcing fibers are wound around the base portion 11 and the resin liner 20 so as to cover the mesh 73, thereby forming a CFRP layer (reinforcing layer) 21 (see FIG. 11). The portion where the mesh 73 is interposed has higher hydrogen gas permeability than the CFRP layer 21. For this reason, in this high pressure tank 1, the hydrogen gas which permeate | transmitted the resin liner 20 permeate | transmits the layer in which the mesh 73 exists, and is discharged | emitted out of a tank. In the case of the high-pressure tank 1 having such a structure, innumerable gaps formed by the interposition of the mesh 73 function as communication holes 70 that guide hydrogen gas to the outside of the tank. In the present specification, such holes are simply referred to as (communication) holes for the sake of convenience. In short, any hole that can discharge (hydrogen) gas that has passed through the resin liner 20 to the outside of the tank may be used. .

<Fourth Embodiment>
In the present embodiment, the communication hole 70 is formed using a solid release agent. First, a solid release agent is applied to the surfaces of the base 11 and the resin liner 20 (see the arrowed portion in FIG. 12). Thereafter, FW molding is performed, and reinforcing fibers are wound around the base portion 11 and the resin liner 20 to form a CFRP layer (reinforcing layer) 21 (see FIG. 13). In this case, the part to which the release agent is applied becomes a non-adhesive layer, and the sealing performance between the base part 11 and the CFRP layer 21 is weakened. For this reason, the hydrogen gas which permeate | transmitted the resin liner 20 becomes easy to escape | emit from the said non-adhesion layer (part which apply | coated the mold release agent). If microbeads or the like are mixed in the release agent, the sealing performance of the base part 11 and the CFRP layer 21 can be further weakened.

<Fifth Embodiment>
In the present embodiment, the communication hole 70 is formed using Teflon (registered trademark). First, the surface of the base part 11 is coated with Teflon (registered trademark). Thereafter, FW molding is performed, and reinforcing fibers are wound around the base portion 11 and the resin liner 20 to form a CFRP layer (reinforcing layer) 21. In this case, the portion coated with Teflon (registered trademark) becomes a non-adhesive layer, and the sealing performance between the base portion 11 and the CFRP layer 21 is weakened. Therefore, the hydrogen gas that has passed through the resin liner 20 easily escapes from this portion. In addition, in order to further weaken the sealing performance between the base part 11 and the CFRP layer 21, a plurality of grooves 74 expanding radially, for example, may be provided as part of the base part 11 as communication hole forming means (see FIG. 14). Similar effects can be obtained with a material that does not adhere to the CFRP layer 21 such as silicon instead of Teflon (registered trademark).

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in each of the above-described embodiments, each form in which the communication hole 70 is formed at the time of FW molding has been described. It is good. Hereinafter, a mode in which small holes 80 are provided in the CFRP layer 21 so that hydrogen gas does not stay between the resin liner 20 and the CFRP layer 21 will be described as another example.

  That is, as described above, under the present circumstances, the gas that has permeated through the resin liner 20 is accumulated between the resin liner 20 and the CFRP layer 21, and when the internal pressure of the tank is reduced, the accumulated gas expands to bring the resin liner 20 into the inner side. May be recessed. In general, since the deformation amount in this case is large, if the gas filling and releasing are repeated, the resin liner 20 may be fatigued at an early stage and the internal gas may leak. In this regard, according to the present embodiment in which the small holes 80 are provided in the CFRP layer 21, it is possible to prevent such a situation by suppressing the accumulation of gas between the CFRP layer 21 and the resin liner 20. . According to this, when releasing hydrogen gas from the high-pressure tank 1, it is possible to suppress the resin liner 20 from being abnormally deformed inward.

  Here, the specific means for providing the small hole 80 is not particularly limited, and for example, a drill 81 can be used. That is, for the high-pressure tank 1 after FW molding (see FIG. 15), after the CFRP layer 21 is solidified by thermosetting, a small hole 80 is provided on the side surface of the tank using a drill 81. Thus, when drilling with the drill 81 or the like, it is preferable to form a small hole 80 that penetrates the CFRP layer 21 but does not penetrate the resin liner 20 (see FIG. 16). Also, the hole diameter (or drill diameter) is not particularly limited, but preferably, the hole diameter (inner diameter) is about 0.5 to 2 mm.

  The small hole 80 as described above functions as a communication hole for discharging the hydrogen gas between the resin liner 20 and the CFRP layer 21 to the outside of the tank, and the gas stays in the gap between the resin liner 20 and the CFRP layer 21. Suppress. According to this, it is possible to avoid damage due to repeated deformation of the resin liner 20 and gas leaks resulting therefrom. Moreover, if the drill 81 or the like is used as in the present embodiment, the small hole 80 can be provided after the high-pressure tank 1 is molded, and the current FW molding process is not changed, and it is simple and low-cost. It is possible to avoid breakage and gas leak.

  When the small holes 80 are provided by using the drill 81 or the like as described above, it is possible to provide a plurality of the small holes 80 in consideration of the size of the tank body 10 or the like (see FIG. 17). In particular, when the high-pressure tank 1 is large, it is preferable to provide a plurality of small holes 80 from the viewpoint of facilitating the discharge of hydrogen gas and avoiding damage and gas leaks. However, it is preferable not to provide the small hole 80 in the portion where the CFRP layer 21 is thinner than the others, such as the shoulder portion of the tank body 10 (near the boundary between the trunk portion and the dome portion) (in FIG. 17). (See the circled part). On the other hand, if the CFRP layer 21 is thicker and more rigid in the periphery of the base part 11 (or in the vicinity of both ends of the tank body 10) than the other parts (for example, the body part), a small hole is formed in the high rigidity part. 80 is preferably provided (see FIG. 17). In general, since the CFRP layer 21 around the base portion 11 is thicker than other portions, providing a small hole 80 only in the thick portion, or combining it with other portions, may increase the tank strength due to drilling. From the viewpoint of influence, it is preferable.

  Further, when a plurality of small holes 80 are provided in this way, it is possible to arrange the plurality of small holes 80 on a straight line along the axial direction (see FIG. 18). It is preferable that If the plurality of small holes 80 are linearly arranged in the axial direction, there is a risk that the tank body 10 may crack in the axial direction due to the influence of the hoop stress. It can be suppressed (see FIG. 19).

  Further, when the burst limit pressure and the fatigue durability performance of the tank body 10 are lowered by providing the small holes (communication holes) 80, the CFRP layer 21 is provided with a reinforcing band 21a, and the band 21a is small. It is also preferable to provide a hole 80 (see FIG. 20). When a plurality of small holes 80 are provided, a plurality of belt-like portions 21a may be provided so as to be aligned in the axial direction, and the small holes 80 may be provided in each of the belt-like portions 21a (see FIG. 21).

  The arrangement of the communication holes (including the small holes 80) 70 exemplified in the above-described embodiments functions as a hole for discharging the hydrogen gas between the resin liner 20 and the CFRP layer 21 to the outside of the tank. As long as it is, it is not particularly limited and can be set arbitrarily.

  Moreover, it is good also as limiting further the exhaust position of the hydrogen gas at the time of making it discharge outside a tank through the above-mentioned communicating hole 70. FIG. For example, if an exhaust pipe is connected to the opening of the communication hole 70, the combustible gas (for example, hydrogen gas) is limited to a limited position outside the tank or outside the apparatus (for example, outside the fuel cell system). It can be exhausted to a different position.

  Moreover, although each embodiment in the case of forming the communication hole 70 by arranging the communication hole forming means (microtube 71 or the like) in the resin liner 20 having the base part 11 has been described so far, It is not restricted to what the valve assembly 50 is attached to. That is, when a boss, for example, is provided on the opposite side of the valve assembly 50 in the high-pressure tank 1, the communication hole 70 can be formed using a base part to which the boss is attached. In this case, the communication hole 70 can be formed in the same manner as in each of the above-described embodiments by using the communication hole forming means (microtube 71, thread 72, etc.) described above. In addition, in FIG. 15 to FIG. 21, a base part to which the boss is attached is indicated by reference numeral 18.

  Further, in the embodiments described so far, the case where the high-pressure tank 1 is a hydrogen tank as a fuel supply source in the fuel cell system 10 and hydrogen gas is filled or supplied has been described. It is only a form example, and naturally it is possible to use the high-pressure tank 1 concerning this invention for gas other than hydrogen gas.

It is a figure which shows the structural example of the fuel cell system in one Embodiment of this invention. It is sectional drawing which shows the principal part of the high pressure tank concerning this invention. It is a fragmentary sectional view of the high pressure tank which shows the 1st Embodiment of this invention. It is a figure which shows a mode that the microtube was arrange | positioned to the resin liner which has a nozzle | cap | die part. It is a figure which shows the whole microtube. It is a figure which shows a mode that a core material is extracted from a microtube after forming a CFRP layer and hardening | curing resin. In the 2nd Embodiment of this invention, it is a figure which shows a mode that the thread | yarn which apply | coated the mold release agent has been arrange | positioned to the resin liner which has a nozzle | cap | die part. It is a figure which shows a mode that a CFRP layer is formed and a thread | yarn is pulled out after hardening of resin. In the 3rd Embodiment of this invention, it is a figure which shows a mode that the mesh which apply | coated the mold release agent to the resin liner which has a nozzle | cap | die part has been arrange | positioned. It is the figure which looked at the nozzle | cap | die part of FIG. 9, the resin liner, and the mesh from the opening side of the nozzle | cap | die part. It is a figure which shows a part of high-pressure tank which formed the CFRP layer and formed the communicating hole with the mesh. In the 4th Embodiment of this invention, it is a figure which shows a mode that the solid mold release agent was apply | coated to the nozzle | cap | die part and the surface of a resin liner. It is a figure which shows a part of high-pressure tank which formed the CFRP layer and formed the communicating hole with the solid mold release agent. In the 5th Embodiment of this invention, it is a figure which shows a mode that the nozzle | cap | die part provided with the several groove | channel extended radially is seen from the opening side. It is a figure which shows the high pressure tank after FW shaping | molding. It is a figure which shows a mode that a small hole is provided in the side surface of a high pressure tank using a drill. It is a figure which shows a mode that a some small hole is provided in a high pressure tank. It is a figure which shows a mode that a some small hole is provided in a high-pressure tank as an arrangement | sequence arranged on a straight line along an axial direction. It is a figure which shows a mode that a several small hole is arrange | positioned spirally in a high pressure tank. It is a figure which shows a mode that a strip | belt part for a reinforcement is provided in the CFRP layer of a high pressure tank, and a small hole is provided in the said strip | belt-shaped part. It is a figure which shows a mode that multiple strip | belt parts for reinforcement are provided in the CFRP layer of a high pressure tank, and a small hole is provided in each of these strip | belt-shaped parts. It is a figure which shows as a reference a mode that the hydrogen gas which permeate | transmitted the resin liner accumulates between the said resin liner and its outer reinforcement layer (CFRP layer). (A) Overall view of high-pressure tank, (B) Partial enlarged view showing, for reference, how hydrogen gas that has permeated through a resin liner accumulates between the resin liner and the outer reinforcing layer (CFRP layer). It is a figure which shows a mode that a resin liner deform | transforms inside at the time of hydrogen gas discharge | release.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High pressure tank, 11 ... Base part, 18 ... Base part, 20 ... Resin liner (liner), 21 ... CFRP layer (reinforcing layer), 70 ... Communication hole, 71 ... Micro tube (communication hole formation means), 72 ... Yarn coated with a release agent (communication hole forming means), 73 ... mesh (communication hole forming means), 74 ... groove (communication hole forming means), 80 ... small hole (communication hole)

Claims (8)

  A base part, a liner, a reinforcing layer provided on the outer periphery of the liner, and a communication hole in which the reinforcing layer or the reinforcing layer is provided in an area adjacent to the base part and communicates the inside of the tank and the outside of the tank And a high pressure tank.   The high-pressure tank according to claim 1, wherein the communication hole is a hole formed between the base portion and the reinforcing layer by a communication hole forming unit.   The high-pressure tank according to claim 2, wherein the communication hole forming means is a microtube.   The high-pressure tank according to claim 2 or 3, wherein a material having higher gas permeability than the liner and the reinforcing layer is used as the communication hole forming means.   The high-pressure tank according to any one of claims 2 to 4, wherein a release agent applied to a contact portion between the base portion and the reinforcing layer is used as the communication hole forming means.   The high-pressure tank according to any one of claims 2 to 5, wherein the communication hole forming means is a groove provided in the base portion.   The base is attached with either a valve assembly that controls gas supply / exhaust between the gas supply path to the outside and the inside of the high-pressure tank, or a boss disposed on the opposite side of the valve assembly. The high-pressure tank according to any one of claims 1 to 6, which is a tank. In a method for manufacturing a high-pressure tank comprising a base part, a liner, and a reinforcing layer provided on the outer periphery of the liner,
In the region where the reinforcing layer or the reinforcing layer is adjacent to the base portion, a communication hole that connects the inside of the tank and the outside of the tank is formed by the communication hole forming means, and FW molding is performed in a state where the communication hole is formed. A method for manufacturing a high-pressure tank.

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