Manufacturing method of high-pressure storage tank and manufacturing fixture of high-pressure storage tank

Abstract

The present invention provides a method for manufacturing a high-pressure storage tank and a jig for manufacturing the high-pressure storage tank. The method for manufacturing a high-pressure storage tank (10) comprises a fiber winding process and a heat curing process, wherein in the fiber winding process, a reinforcing shaft (42) is inserted from a connecting nozzle (26a) to the other end of an inner liner (22), the axial length of the inner liner (22) is fixed by the reinforcing shaft (42), and a fiber reinforced resin (RR) is wound; in the heat curing process, the reinforcing shaft (42) is released from the other end of the inner liner (22), so that the inner liner (22) can change in the axial direction, and the fiber reinforced resin (RR) is heated. Thus, stress generated in the reinforcing layer is suppressed.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a high-pressure storage tank for storing gas and a manufacturing fixture for the high-pressure storage tank. Background Art

[0002] A high-pressure storage tank is mounted on a fuel cell vehicle (fuel cell car) as a device for storing high-pressure hydrogen. As disclosed in International Publication No. 2010 / 058451, this high-pressure storage tank has a liner, a reinforcement layer, and a connection nozzle, wherein the reinforcement layer is used to reinforce the liner; the connection nozzle is connected to the liner and has a flow path that allows gas to flow. The reinforcement layer has a structure in which a fiber-reinforced resin is wound on the outer surface of the liner. The fiber-reinforced resin is wound by a filament winding process.

[0003] In the fiber winding process, the fiber reinforced resin is wound around the outer surface of the inner liner while applying tension to the fiber reinforced resin under the condition that the inner pressure is applied to the inner liner. At this time, due to the balance between the inner pressure of the inner liner and the tension of the fiber reinforced resin, the total length of the high-pressure storage tank may change.

[0004] Therefore, in the fiber winding process of International Publication No. 2010 / 058451, a reinforcing shaft penetrating the interior of the inner liner is fixed to the inner liner, thereby preventing the overall length of the high-pressure storage tank from being increased. Summary of the invention

[0005] However, the reinforcement layer formed in the filament winding step using the reinforcement shaft has a problem in that residual stress is generated in the reinforcement layer in the thermal curing step after the filament winding step.

[0006] That is, the reinforcing shaft expands thermally during the thermal curing process, generating a force that causes the reinforcing layer and the inner liner to expand in the axial direction. If the fiber-reinforced resin constituting the reinforcing layer is cured while a force from the reinforcing shaft is applied, residual stress may be generated in the reinforcing layer. In addition, the reinforcing layer of the high-pressure storage tank during thermal curing may sometimes undergo natural expansion deformation. If the natural expansion deformation of the reinforcing layer is suppressed by the reinforcing shaft, the fiber-reinforced resin may sometimes be cured while a compressive stress is applied. Depending on the conditions, the opposite of the above may occur, and the fiber-reinforced resin may be cured while an expansion stress is applied because the shrinkage deformation of the fiber-reinforced resin during thermal curing is suppressed by the reinforcing shaft.

[0007] In addition, the internal pressure applied to the inner part of the liner during the fiber winding process cannot be removed before the thermal curing of the fiber reinforced resin is completed. Therefore, it is difficult to remove the reinforcing shaft after the fiber winding process. In the thermal curing process after the fiber winding process using the reinforcing shaft, it is desirable to suppress the stress generated in the reinforcing layer.

[0008] The purpose of the present invention is to solve the above technical problems.

[0009] The viewpoint disclosed below is: a method for manufacturing a high-pressure storage tank, which has an inner liner and a reinforcement layer, wherein the inner liner has a filling space inside; the reinforcement layer is arranged on the outer periphery of the inner liner, and the method for manufacturing the high-pressure storage tank has the following steps: a step of inserting a reinforcement shaft through one end and the other end of the inner liner to fix the reinforcement shaft to the inner liner, and fixing the axial length of the inner liner by the reinforcement shaft; a fiber winding step of keeping the interior of the inner liner in a pressurized state and winding a fiber reinforced resin around the outer periphery of the inner liner; a step of releasing the fixation of at least one of the one end and the other end of the inner liner to the reinforcement shaft to allow the inner liner to deform in the axial direction; and a thermal curing step of heating the fiber reinforced resin to form a reinforcement layer on the outer periphery of the inner liner in a state where the fixation of the reinforcement shaft to the other end of the inner liner is released.

[0010] Another viewpoint is: a manufacturing fixture for a high-pressure storage tank, which has an inner liner, a first connecting nozzle, a second connecting nozzle and a reinforcement layer, wherein the inner liner has a filling space inside; the first connecting nozzle is joined to one end of the inner liner; the second connecting nozzle is joined to the other end of the inner liner; the reinforcement layer is arranged on the outer periphery of the inner liner, and the manufacturing fixture for the high-pressure storage tank has a reinforcement shaft, a first connecting piece and a second connecting piece, wherein the reinforcement shaft passes through the first connecting nozzle and the second connecting nozzle to airtightly seal the interior of the inner liner; the first connecting piece fixes the reinforcement shaft to the first connecting nozzle; the second connecting piece fixes the reinforcement shaft to the second connecting nozzle, and a fixing mechanism is provided on at least one of the first connecting piece and the second connecting piece, and the fixing mechanism fixes the reinforcement shaft in a manner that can release the fixation of the reinforcement shaft.

[0011] Another viewpoint is: a manufacturing fixture for a high-pressure storage tank, which has an inner liner, a first connecting nozzle, a second connecting nozzle and a reinforcement layer, wherein the inner liner has a filling space inside; the first connecting nozzle is joined to one end of the inner liner; the second connecting nozzle is joined to the other end of the inner liner; the reinforcement layer is arranged on the outer periphery of the inner liner, and the manufacturing fixture for the high-pressure storage tank has a reinforcement shaft, a first connecting piece and a second connecting piece, wherein the reinforcement shaft passes through the first connecting nozzle and the second connecting nozzle to hermetically seal the interior of the inner liner; the first connecting piece fixes the reinforcement shaft to the first connecting nozzle; the second connecting piece fixes the reinforcement shaft to the second connecting nozzle, and the reinforcement shaft has a first shaft, a second shaft and a connecting mechanism, wherein the first shaft is fixed to the first connecting piece; the second shaft is fixed to the second connecting piece; the connecting mechanism connects the first shaft and the second shaft in a manner that the connection between them can be released.

[0012] According to the method for manufacturing a high-pressure storage tank and the jig for manufacturing a high-pressure storage tank of the above-described viewpoint, it is possible to suppress the generation of stress in the reinforcement layer in the thermal curing step after the filament winding step using the reinforcement shaft.

[0013] The above-mentioned objects, features, and advantages will be easily understood from the following description of the embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an explanatory diagram of the filament winding step according to the first embodiment.

[0015] Figure 2 This is a cross-sectional view showing a state in which the manufacturing jig of the high-pressure storage tank according to the first embodiment is attached to the inner tank.

[0016] Figure 3 This is a cross-sectional view showing a state where a manufacturing jig for a high-pressure storage tank according to the second embodiment is attached to an inner tank.

[0017] Figure 4 A cross-sectional view showing a state where a manufacturing jig for a high-pressure storage tank according to a third embodiment is mounted on an inner tank. DETAILED DESCRIPTION

[0018] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings by listing preferred embodiments.

[0019] (First embodiment)

[0020] like Figure 1As shown, the high-pressure storage tank 10 involved in the first embodiment of the present invention has a filling space 12 for compressing and storing gas. The high-pressure storage tank 10 is applied to, for example, a fuel cell system. The high-pressure storage tank 10 stores hydrogen (fuel gas, anode gas) as a gas. For example, the high-pressure storage tank 10 is mounted on a fuel cell vehicle not shown in the figure, and stores hydrogen supplied from a gas station. The high-pressure storage tank 10 supplies hydrogen to a fuel cell stack (not shown) when the vehicle is traveling. In addition, the high-pressure storage tank 10 is not limited to application in a fuel cell system. The high-pressure storage tank 10 can store gases other than hydrogen.

[0021] The high-pressure storage tank 10 has a cylindrical main body 16 and a roughly hemispherical plugging portion 18, and the plugging portion 18 blocks both ends of the main body 16. The high-pressure storage tank 10 has a filling space 12 formed inside. The high-pressure storage tank 10 is sized so that the filling space 12 has an appropriate volume. The plugging portion 18 at one end of the high-pressure storage tank 10 and the plugging portion 18 at the other end have a port portion 20. The port portion 20 connects the outside of the high-pressure storage tank 10 and the filling space 12. The port portion 20 becomes a portion connected to other components (piping, valve) of the fuel cell system.

[0022] The high-pressure storage tank 10 includes an inner liner 22, a reinforcement layer 24, and connection nozzles 26a and 26b. The inner liner 22 has a filling space 12 inside. The reinforcement layer 24 covers the outer surface of the inner liner 22. The connection nozzles 26a and 26b constitute a port portion 20 and allow hydrogen gas to flow.

[0023] like Figure 2 As shown, the liner 22 constitutes the inner layer (skeleton) of the high-pressure storage tank 10. The liner 22 has a main body 28. One end of the main body 28 is fixed to the connecting nozzle 26a. The other end of the main body 28 is fixed to the connecting nozzle 26b. The liner 22 is integrally formed of a resin material (for example, a polyamide resin). In addition, the liner 22 may also have a structure in which a plurality of resin layers are stacked. In addition, although in the example shown in the figure, the main body 28 is integrally formed, it is not limited to this structure. For example, the main body 28 may also have a structure in which two components having a joint portion in the axial middle portion of the main body 16 are joined.

[0024] The reinforcing layer 24 is directly laminated on the outer peripheral portion 29 of the main body portion 28. The main body portion 16 of the main body portion 28 extends linearly in the axial direction. The blocking portion 18 of the main body portion 28 is smoothly curved from the main body portion 16 to the inside in the radial direction.

[0025] The reinforcement layer 24 constitutes the outer layer of the high-pressure storage tank 10. The reinforcement layer 24 covers the entire main body 28 of the inner liner 22 and a portion of the connection nozzles 26a, 26b installed on the inner liner 22. The material of the reinforcement layer 24 is preferably a carbon fiber reinforced resin, for example. The reinforcement layer 24 is formed by a fiber winding process and a subsequent thermal curing process. The fiber winding process includes a process of winding an uncured strip-shaped fiber reinforced resin RR onto the inner liner 22.

[0026] The first connecting nozzle 26a is arranged at the blocking portion 18 at one end of the high-pressure storage tank 10. The first connecting nozzle 26a constitutes the port portion 20 of hydrogen. The first connecting nozzle 26a has a first part 30 and a second part 32, wherein the first part 30 protrudes to the outside of the inner liner 22; and the second part 32 is arranged on the inner side of the inner liner 22. The first part 30 and the second part 32 are formed of metal material. The first part 30 is formed into a cylindrical shape. The first part 30 has a through hole 34 that passes through the first connecting nozzle 26a inside. The second part 32 extends radially outward from the first part 30 in a flange shape.

[0027] The outer diameter portion of the first component 30 has a shape that can be mounted with other components of the fuel cell system (outlet valve). In the manufacturing process of the high-pressure storage tank 10, a first connector 46 of a manufacturing jig 40 described below is mounted on the outer diameter portion of the first connection nozzle 26a.

[0028] The second connection nozzle 26b is disposed at the blocked portion 18 at the other end of the high-pressure storage tank 10. The second connection nozzle 26b is configured similarly to the first connection nozzle 26a.

[0029] like Figure 2 As shown, the fiber winding process is performed in a state where the manufacturing jig 40 is installed. The manufacturing jig 40 has a reinforcing shaft 42, a first connecting piece 46, and a second connecting piece 48. The reinforcing shaft 42 is installed in a manner that penetrates one end and the other end of the inner liner 22. The first connecting piece 46 fixes the reinforcing shaft 42 to the first connecting nozzle 26a. The second connecting piece 48 fixes the reinforcing shaft 42 to the second connecting nozzle 26b.

[0030] The reinforcing shaft 42 is engaged with the first connecting piece 46 and is integrated with the first connecting piece 46. The reinforcing shaft 42 is inserted into the interior of the inner liner 22 from the first connecting nozzle 26a. The other end of the reinforcing shaft 42 passes through the interior of the inner liner 22 and protrudes from the second connecting nozzle 26b. The reinforcing shaft 42 has a cylindrical shape whose outer diameter is approximately the same as the inner diameter of the through hole 34 of the connecting nozzles 26a, 26b. When the reinforcing shaft 42 is inserted into the connecting nozzles 26a, 26b, the reinforcing shaft 42 seals the through hole 34 airtightly. That is, the reinforcing shaft 42 inserted into the connecting nozzles 26a, 26b keeps the filling space 12 of the inner liner 22 in a pressurized state.

[0031] The reinforcing shaft 42 has a fixing hole 42b fixed to the second connecting member 48 at a predetermined position. The fixing hole 42b opens on the outer surface of the reinforcing shaft 42. The fixing hole 42b is formed to a predetermined depth in the radial direction. The fixing hole 42b is formed at a position where the locking pin 47 can be inserted. When the first connecting member 46 is fastened to the first connecting nozzle 26a, the locking pin 47 is inserted into the second connecting member 48. The locking pin 47 will be described later. In addition, instead of the fixing hole 42b, the reinforcing shaft 42 may have a groove having the same depth as the fixing hole 42b. The groove is formed in an annular shape over the entire circumferential area of ​​the reinforcing shaft 42.

[0032] The first connector 46 includes a main body 46a and a fastening portion 46b protruding from the outer periphery of the main body 46a. The main body 46a includes an axial hole 46c at its center for the reinforcing shaft 42 to pass through. The reinforcing shaft 42 is joined to the axial hole 46c by bonding, fitting, or welding. The fastening portion 46b includes a fastening mechanism fastened to the outer diameter portion of the first component 30 of the first connecting nozzle 26a. The first connector 46 fixes the reinforcing shaft 42 to the first connecting nozzle 26a through the fastening portion 46b.

[0033] The second connecting member 48 includes a main body 48a, a fastening portion 48b, and a locking pin 47, wherein the fastening portion 48b protrudes from the outer periphery of the main body 48a. A through hole 48c is formed on the main body 48a, through which the reinforcing shaft 42 can pass. The main body 48a can move in the axial direction of the reinforcing shaft 42 through the through hole 48c. The through hole 48c allows the second connecting member 48 to rotate around the axis of the reinforcing shaft 42.

[0034] In addition, a locking hole 49 constituting the fixing mechanism 50 of the present embodiment is formed in the main body 48a. The locking hole 49 is formed to penetrate the side portion of the main body 48a. The locking hole 49 is formed to have a cross-sectional size that allows the locking pin 47 to pass through. When the first connector 46 is fastened to the first connection nozzle 26a and the second connector 48 is mounted to the second connection nozzle 26b, the locking hole 49 can communicate with the fixing hole 42b of the reinforcing shaft 42. By adjusting the circumferential position of the second connector 48, the locking hole 49 communicates with the fixing hole 42b of the reinforcing shaft 42.

[0035] The locking pin 47 is a rod-shaped member inserted into the locking hole 49 and the fixing hole 42b. The locking pin 47 fixes the reinforcing shaft 42 and the second connecting member 48 in the axial direction and the circumferential direction. Therefore, the reinforcing shaft 42 is fixed to the second connecting nozzle 26b through the second connecting member 48. That is, the locking pin 47 and the locking hole 49 constitute a fixing mechanism 50. The fixing mechanism 50 fixes the reinforcing shaft 42 and the second connecting nozzle 26b in a manner that the fixing therebetween can be released. In addition, the locking pin 47 can be easily removed. When the locking pin 47 is folded down, the fixing mechanism 50 releases the fixing state of the reinforcing shaft 42 and the second connecting member 48. The fixing mechanism 50 can also replace the locking pin 47 with a plate-shaped member. In addition, when a groove is provided instead of the fixing hole 42b, the locking pin 47 is not limited to a rod-shaped member. The fixing mechanism 50 can use, for example, a clip-shaped member that can be inserted along the groove instead of the locking pin 47. In this case, the fixing mechanism 50 fixes two places in the circumferential direction of the reinforcing shaft 42.

[0036] Next, a method for manufacturing the high-pressure storage tank 10 according to the present embodiment will be described.

[0037] like Figure 1 As shown, in the manufacturing method of the high-pressure storage tank 10, the fiber winding process is performed in a state where the inner liner 22 and the connecting nozzles 26a, 26b are assembled together. Hereinafter, the inner liner 22 and the connecting nozzles 26a, 26 are collectively referred to as a workpiece W. In the fiber winding process, a reinforcing layer 24 is formed by winding a fiber-reinforced resin RR on the outer surface of the workpiece W.

[0038] In inserting Figure 2 The locking pin 47 is in the state of Figure 1 That is, the filament winding step is performed in a state where the reinforcing shaft 42 is fixed to the second connection nozzle 26b by the fixing mechanism 50.

[0039] Before the fiber winding process, Figure 2 As shown, the manufacturing jig 40 is installed on the workpiece W. First, the reinforcing shaft 42 is inserted into the workpiece W from the first connecting nozzle 26a. The reinforcing shaft 42 passes through the second connecting nozzle 26b from the first connecting nozzle 26a. Then, the first connecting member 46 is fastened to the first connecting nozzle 26a. Thus, the reinforcing shaft 42 is fixed to the first connecting nozzle 26a. Then, the reinforcing shaft 42 passes through the through hole 48c of the second connecting member 48. Thus, the reinforcing shaft 42 is fixed to the second connecting nozzle 26b through the second connecting member 48. Then, the locking pin 47 is inserted into the locking hole 49 and the fixing hole 42b. Thus, the fixing mechanism 50 is in a fixed state. The reinforcing shaft 42 is fixed to the first connecting nozzle 26a and the second connecting nozzle 26b.

[0040] Then, the fluid is introduced into the filling space 12 of the inner liner 22 through a gas flow path (not shown) (provided inside the reinforcing shaft 42, etc.). The fluid pressurizes the inner liner 22 from the inside.

[0041] Then, if Figure 1 As shown, one end and the other end of the reinforcing shaft 42 are mounted on a rotating mechanism 76. Then, the rotating mechanism 76 rotates the inner liner 22 together with the reinforcing shaft 42. And, the fiber-reinforced resin RR is wound around the rotating workpiece W. The reinforcing fibers RF constituting the fiber-reinforced resin are supplied by one or more creels 78. The reinforcing fibers RF become the fiber-reinforced resin RR by being impregnated with the base material resin in the impregnation section 80.

[0042] During the continuous winding of the fiber reinforced resin RR, a force tending to shorten or lengthen the overall length of the workpiece W is exerted by balancing the internal pressure of the liner 22 and the tension of the fiber reinforced resin RR. The manufacturing method of this embodiment can prevent the overall length of the workpiece W from changing by fixing the reinforcing shaft 42 to the first connection nozzle 26a and the second connection nozzle 26b.

[0043] After the winding of the fiber-reinforced resin RR is completed, the reinforcing shaft 42 is removed from the rotating mechanism 76. Figure 2 As shown, the lock pin 47 of the second connector 48 is pulled out. When the lock pin 47 is pulled out, the fixing mechanism 50 releases the fixing of the reinforcing shaft 42 and the second connector 48. Thus, the reinforcing shaft 42 is not fixed to the second connection nozzle 26b.

[0044] Next, the workpiece W is moved into a heating furnace together with the reinforcing shaft 42. The heating furnace heats the workpiece W to a specified temperature to solidify the fiber-reinforced resin RR. The reinforcing shaft 42 thermally expands during the thermal curing process and expands in the axial direction. Since the reinforcing shaft 42 is not fixed to the second connecting nozzle 26b, the reinforcing layer 24 can be cured without applying a load to the fiber-reinforced resin RR. The reinforcing shaft 42 does not interfere with the natural expansion or contraction of the high-pressure storage tank 10 during thermal curing. Therefore, the manufacturing method of the high-pressure storage tank 10 of the present embodiment can form the reinforcing layer 24 while suppressing the generation of residual stress.

[0045] (Second embodiment)

[0046] In this embodiment, reference is used Figure 2 The manufacturing jig 40A according to the modified example of the manufacturing jig 40 described above. Figure 3 As shown, the manufacturing jig 40A of this embodiment has a first connection piece 46A mounted on the first connection nozzle 26a. The first connection piece 46A has a lock pin 47 and a fixing mechanism 50. The fixing mechanism 50 fixes the reinforcement shaft 42A to the first connection nozzle 26a.

[0047] The reinforcing shaft 42A has a fixing hole 42b at a position that can engage with the locking pin 47. That is, the reinforcing shaft 42A is fixed to the first connection nozzle 26a and to the second connection nozzle 26b using two fixing mechanisms 50. Other structures of the manufacturing jig 40A are similar to Figure 2 The manufacturing jig 40 is similar to that of the present invention, and therefore the same reference numerals are given to the same structures and the description thereof is omitted. In addition, in the present embodiment, the reinforcing shaft 42A may have a groove instead of the fixing hole 42b.

[0048] Manufacturing method of high pressure storage tank 10 using manufacturing jig 40A and reference Figure 1 The fiber winding process described above is the same. In the process of winding the fiber reinforced resin RR by the fiber winding process, the fixing mechanisms 50 of both the first connector 46A and the second connector 48 are fixed to fix the reinforcing shaft 42. In the thermal curing process, the fixing state of the fixing mechanisms 50 of either or both of the first connector 46A and the second connector 48 is released. The manufacturing jig 40A according to this embodiment can also obtain the same effect as the manufacturing jig 40.

[0049] (Third embodiment)

[0050] This embodiment is to refer to Figure 2 Another modification of the manufacturing jig 40 described above will be described. Figure 4 As shown, in the manufacturing jig 40B of this embodiment, the reinforcing shaft 42B has a first shaft 52 and a second shaft 54. The first shaft 52 is fixed to the first connection nozzle 26a by a first connector 46B, and the second shaft 54 ​​is fixed to the second connection nozzle 26b by a second connector 48B.

[0051] The first shaft 52 and the second shaft 54 ​​are connected inside the inner container 22 by a connection mechanism 56. The connection mechanism 56 is configured so that the connection state can be released by inputting an operating force from the first shaft 52 or the second shaft 54 ​​protruding from the inner container 22.

[0052] In this embodiment, the connection mechanism 56 has a screw structure. By rotating the first shaft 52 and the second shaft 54 ​​in a predetermined direction, the first shaft 52 and the second shaft 54 ​​can be displaced in the axial direction. As a result, the fixed state of the positional relationship between the first connection nozzle 26a and the second connection nozzle 26b by the reinforcement shaft 42B is released.

[0053] The first connecting member 46B allows the first shaft 52 to rotate. In addition, the second connecting member 48B allows the second shaft 54 ​​to rotate. When a certain degree of rotational force is input, the first shaft 52 and the second shaft 54 ​​rotate. Thus, even according to the manufacturing jig 40B of this embodiment having the first shaft 52 and the second shaft 54, the manufacturing jig 40B can obtain the same effect as the manufacturing jig 40.

[0054] Next, the manufacturing method of the high-pressure storage tank 10 according to each of the above-mentioned embodiments and the effects of the manufacturing jigs 40 , 40A, and 40B will be described.

[0055] In a manufacturing method of a high-pressure storage tank 10 involved in one embodiment, the high-pressure storage tank 10 has an inner liner 22 and a reinforcing layer 24, wherein the inner liner 22 has a filling space 12 inside; the reinforcing layer 24 is arranged on the outer peripheral portion 29 of the inner liner 22, and the manufacturing method of the high-pressure storage tank 10 has the following steps: inserting a reinforcing shaft 42 through one end and the other end of the inner liner 22 to fix the reinforcing shaft 42 to the inner liner 22, and fixing the inner liner 22 in the axial direction by the reinforcing shaft 42 The process includes: a process of increasing the length of the inner liner 22; a process of winding a fiber reinforced resin RR around the outer periphery 29 of the inner liner 22 while keeping the interior of the inner liner 22 in a pressurized state; a process of releasing the fixation between the reinforcing shaft 42 and the other end of the inner liner 22 (for example, the second connecting nozzle 26b) to allow the inner liner 22 to deform in the axial direction; and a process of heat-curing the fiber reinforced resin RR to form a reinforcing layer 24 on the outer periphery 29 of the inner liner 22 while releasing the fixation between the reinforcing shaft 42 and the other end of the inner liner 22.

[0056] According to the above-mentioned manufacturing method, after the fiber winding process, the restriction of the inner liner 22 in the entire length direction can be released. According to this manufacturing method, the fiber winding process can be performed while preventing the deformation of the high-pressure storage tank 10. In addition, this manufacturing method can take into account both eliminating the risk of residual stress in the thermal curing process and preventing the high-pressure storage tank 10 from deforming in the fiber winding process. As a result, the quality deviation of the high-pressure storage tank 10 is suppressed and the reliability is improved. In addition, according to this manufacturing method, the residual stress can be reduced, so the reinforcing layer 24 can be made thinner. Therefore, this manufacturing method can reduce the amount of fiber reinforced resin RR, thereby reducing the manufacturing cost of the high-pressure storage tank 10.

[0057] In the manufacturing method of the above-mentioned high-pressure storage tank 10, the high-pressure storage tank 10 has a first connecting nozzle 26a and a second connecting nozzle 26b, wherein the first connecting nozzle 26a is engaged with one end of the inner liner 22 and allows the reinforcing shaft 42 to pass through; the second connecting nozzle 26b is engaged with the other end of the inner liner 22 and allows the reinforcing shaft 42 to pass through, the first connecting member 46, 46A, 46B is installed on the first connecting nozzle 26a, and the second connecting member 48, 48B is installed on the second connecting nozzle 26b, wherein the first connecting member 46, 46A, 46B fixes the reinforcing shaft 42 to the first connecting nozzle 26a; the second connecting member 48, 48B fixes the reinforcing shaft 42 to the second connecting nozzle 26b, the fiber winding process is performed in a state where the reinforcing shaft 42 is fixed to the first connecting nozzle 26a and the second connecting nozzle 26b, and the heat curing process is performed in a state where the second connecting member 48 is released from fixing the reinforcing shaft 42. According to this manufacturing method, it is also possible to achieve both prevention of deformation of the high-pressure storage tank 10 in the fiber winding process and elimination of the risk of residual stress generation in the thermal curing process.

[0058] In the manufacturing method of the above-mentioned high-pressure storage tank 10, the high-pressure storage tank 10 has a first connection nozzle 26a and a second connection nozzle 26b, wherein the first connection nozzle 26a is connected to one end of the inner liner 22 and is passed through by the reinforcing shaft 42B; the second connection nozzle 26b is connected to the other end of the inner liner 22 and is passed through by the reinforcing shaft 42B, and the reinforcing shaft 42B has a first shaft 52, a second shaft 54 ​​and a connecting mechanism 56, wherein the first shaft 52 passes through the first connection nozzle 26a; the second shaft 54 ​​passes through the second connection nozzle 26b; the connecting mechanism 56 connects the first shaft 52 and the second shaft 54 is connected in a releasable manner, a first connection member 46B is installed on the first connection nozzle 26a, and a second connection member 48B is installed on the second connection nozzle 26b, wherein the first connection member 46B fixes the reinforcing shaft 42B to the first connection nozzle 26a; the second connection member 48B fixes the reinforcing shaft 42B to the second connection nozzle 26b, the fiber winding process is performed in a state where the first shaft 52 and the second shaft 54 ​​are connected by the connection mechanism 56, and the heat curing process is performed in a state where the connection between the first shaft 52 and the second shaft 54 ​​by the connection mechanism 56 is released. According to this manufacturing method, it is also possible to take into account both the prevention of deformation of the high-pressure storage tank 10 in the fiber winding process and the elimination of the risk of residual stress in the heat curing process.

[0059] In the manufacturing method of the high pressure storage tank 10, the fiber winding step and the heat curing step are performed after the first connection nozzle 26a and the second connection nozzle 26b are hermetically sealed by the reinforcing shaft 42. According to this manufacturing method, the liner 22 can be prevented from being dented during the heat curing step.

[0060] In a manufacturing fixture 40, 40A of a high-pressure storage tank 10 involved in one embodiment, the high-pressure storage tank 10 has an inner liner 22, a first connection nozzle 26a, a second connection nozzle 26b and a reinforcing layer 24, wherein the inner liner 22 has a filling space 12 inside; the first connection nozzle 26a is connected to one end of the inner liner 22; the second connection nozzle 26b is connected to the other end of the inner liner 22; the reinforcing layer 24 is arranged on the outer periphery 29 of the inner liner 22, and the manufacturing fixture 40, 40A of the high-pressure storage tank 10 has a reinforcing shaft 42, a first connection nozzle 26a, a second connection nozzle 26b and a reinforcing layer 24. Parts 46, 46A and a second connecting member 48, wherein the reinforcing shaft 42 passes through the first connecting nozzle 26a and the second connecting nozzle 26b to hermetically seal the interior of the inner liner 22; the first connecting member 46, 46A fixes the reinforcing shaft 42 to the first connecting nozzle 26a; the second connecting member 48 fixes the reinforcing shaft 42 to the second connecting nozzle 26b, and at least one of the first connecting member 46, 46A and the second connecting member 48 is provided with a fixing mechanism 50, which fixes the reinforcing shaft 42 in a manner that can release the fixation of the reinforcing shaft. According to the manufacturing fixture 40, 40A, after the fiber winding process, the restriction on the full length of the inner liner 22 can be released by a simple operation. Therefore, the manufacturing fixture 40, 40A can take into account both preventing the inner liner 22 from being deformed in its entirety during the fiber winding process and eliminating the risk of residual stress in the thermal curing process.

[0061] In another embodiment of the manufacturing fixture 40B of the high-pressure storage tank 10, the high-pressure storage tank 10 has an inner liner 22, a first connecting nozzle 26a, a second connecting nozzle 26b and a reinforcing layer 24, wherein the inner liner 22 has a filling space 12 inside; the first connecting nozzle 26a is connected to one end of the inner liner 22; the second connecting nozzle 26b is connected to the other end of the inner liner 22; the reinforcing layer 24 is arranged on the outer periphery 29 of the inner liner 22, and the manufacturing fixture 40B of the high-pressure storage tank 10 has a reinforcing shaft 42B, a first connecting piece 46B and a second connecting piece 48B, wherein the reinforcing The shaft 42B passes through the first connecting nozzle 26a and the second connecting nozzle 26b to hermetically seal the interior of the liner 22; the first connecting piece 46B fixes the reinforcing shaft 42B to the first connecting nozzle 26a; the second connecting piece 48B fixes the reinforcing shaft 42B to the second connecting nozzle 26b, and the reinforcing shaft 42B has a first shaft 52, a second shaft 54 ​​and a connecting mechanism 56, wherein the first shaft 52 is fixed to the first connecting piece 46B; the second shaft 54 ​​is fixed to the second connecting piece 48B; the connecting mechanism 56 connects the first shaft 52 and the second shaft 54 ​​in a manner that the connection therebetween can be released. According to the manufacturing fixture 40B, the restriction on the full length of the liner 22 can also be released by simple operation, so that the full-length deformation of the liner 22 in the fiber winding process and the risk of residual stress in the thermal curing process can be taken into account.

[0062] In the above, the present invention has been described by taking the preferred embodiments as examples, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

Claims

1. A method for manufacturing a high-pressure storage tank, the high-pressure storage tank having an inner liner and a reinforcement layer, in, The inner liner has a filling space inside; the reinforcement layer is arranged on the outer periphery of the inner liner, and the manufacturing method of the high-pressure storage tank is characterized by having the following steps: The process of inserting a reinforcing shaft through a first connection nozzle connected to a first end of the inner liner and a second connection nozzle connected to a second end of the inner liner to fix the reinforcing shaft to the inner liner, and fixing the axial length of the inner liner by the reinforcing shaft; A fiber winding step of winding a fiber-reinforced resin around the outer periphery of the inner liner while keeping the inner liner in a pressurized state; After the fiber winding step, the second connection nozzle of the inner liner and the reinforcing shaft are released from the fixing without pulling out the reinforcing shaft, so that the inner liner can be deformed in the axial direction; and After releasing the fixing process of the reinforcing shaft and the second connecting nozzle, the inner liner and the fiber-reinforced resin are placed in a heating furnace together with the reinforcing shaft without pulling out the reinforcing shaft, and the fiber-reinforced resin is heated to form a reinforcing layer on the outer periphery of the inner liner, The filament winding step and the thermal curing step are performed after the first connection nozzle and the second connection nozzle are hermetically sealed by the reinforcing shaft.

2. The method for manufacturing a high-pressure storage tank according to claim 1, It is characterized in that The method comprises the steps of installing a first connecting member on the first connecting nozzle and installing a second connecting member on the second connecting nozzle, wherein the first connecting member is used to fix the reinforcing shaft to the first connecting nozzle; and the second connecting member is used to fix the reinforcing shaft to the second connecting nozzle. The fiber winding step is performed in a state where the reinforcing shaft is fixed to the first connection nozzle and the second connection nozzle by the first connection member and the second connection member, The thermal curing step is performed in a state where the second connection tool has released the fixation of the reinforcement shaft relative to the second connection nozzle.

3. The method for manufacturing a high-pressure storage tank according to claim 1, It is characterized in that The reinforcing shaft comprises a first shaft, a second shaft and a connecting mechanism, wherein the first shaft passes through the first connecting nozzle; the second shaft passes through the second connecting nozzle; and the connecting mechanism connects the first shaft and the second shaft in a manner that the connection therebetween can be released. The first shaft is fixed to the first connection nozzle via a first connection member, and the second shaft is fixed to the second connection nozzle via a second connection member. The fiber winding step is performed in a state where the first shaft and the second shaft are connected by the connection mechanism, The thermal curing step is performed in a state where the connection between the first shaft and the second shaft by the connection mechanism is released.

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