JP2017122464A - Pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent idle-running of a cap.SOLUTION: A pressure container A includes: a liner 10 formed so as to connect dome sections 12, 13 to end portions of an approximately cylindrical trunk section 11; caps 22, 28 concentrically covering outer surfaces of the dome sections 12, 13; a fiber bundle 34 wound around the outer surface of the liner 10; a fiber-reinforced resin layer 33 covering the outer surface of the liner 10; rotation regulating protrusions 17, 20 formed in areas including parting lines 21 out of outer peripheries of the domes 12, 13; and rotation regulating recesses 27, 32 formed on the caps 22, 28 and engaged with the rotation regulating protrusion 17, 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure vessel.

  Patent Document 1 includes a liner having dome portions formed at both ends of a cylindrical straight body portion, a base attached to the center of the dome portion, and a fiber reinforced resin layer formed on the outer periphery of the liner. A pressure vessel is disclosed. When the fiber reinforced resin layer is formed, a fiber bundle is wound around the outer periphery of the liner while rotating the drive shaft fitted to the die and rotating the die and the liner integrally.

JP 2012-045826 A

  In the step of winding the fiber bundle, a shearing force in the rotational direction acts on the interface between the base on the driving side rotated by the driving shaft and the liner on the driven side for drawing the fiber bundle. Therefore, when the shearing force increases, there is a concern that slip occurs between the base and the liner and the base slips.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to prevent the slip of the base.

The pressure vessel of the present invention is
A liner in a form in which a dome part is connected to an end of a substantially cylindrical body part;
A base that concentrically covers the outer surface of the dome,
A fiber reinforced resin layer comprising a fiber bundle in a form wound around the outer surface of the liner, and covering the outer surface of the liner;
A rotation restricting convex portion formed in a region including a parting line in the outer periphery of the dome portion,
It is characterized in that it includes a rotation restricting recess formed in the base and fitted in the rotation restricting protrusion.

  Relative transfer of the die to the liner is restricted by the fitting of the rotation restricting convex portion and the rotation restricting concave portion, so that the die can be prevented from idling in the step of winding the fiber bundle around the liner while rotating the die. Further, since the rotation restricting convex portion is arranged in the region including the parting line, the rotation restricting convex portion can be formed in the step of forming the liner with a blow molding die.

The perspective view of the pressure vessel of Example 1 Perspective view showing the state where the base is removed from the liner Sectional view showing the process of winding the fiber bundle around the liner Cross section of pressure vessel Plan view showing the process of molding the liner

  In the present invention, the rotation restricting recess may be arranged so as to open to an outer peripheral edge of the base. According to this configuration, the radial dimension from the rotation center when the base is rotationally driven to the fitting position between the rotation restricting concave portion and the rotation restricting convex portion is secured long, so that the rotational force from the base is received. The stress of the rotation restricting convex portion is reduced. Thereby, a deformation | transformation of a rotation control convex part can be prevented.

  In the present invention, the rotation restricting recess may be open to the outer surface of the base. According to this configuration, when the base is assembled to the liner, the position of the rotation restricting convex portion can be visually confirmed.

  In the present invention, the rotation restricting convex portion may be fitted into the rotation restricting concave portion over the entire region in the thickness direction of the base. According to this configuration, the contact area between the rotation restricting concave portion and the rotation restricting convex portion is widened, so that the stress of the rotation restricting convex portion when receiving the rotational force from the base is reduced. Thereby, a deformation | transformation of a rotation control convex part can be prevented.

  In the present invention, the outer surface of the rotation restricting convex portion and the outer surface of the base may be flush with each other. According to this configuration, there is no step or unevenness at the fitting portion between the rotation restricting convex portion and the rotation restricting concave portion, so that no gap is formed between the wound fiber bundle.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. The pressure vessel A of Example 1 includes a liner 10 made of synthetic resin, a first base 22 (a base described in claims), a second base 28 (a base described in claims), and a fiber-reinforced resin layer. 33. The pressure vessel A is mounted on a fuel cell vehicle or a natural gas vehicle, and is used as a high-pressure hydrogen gas or natural gas filling vessel.

<Liner 10>
The liner 10 includes a cylindrical portion 11 having a substantially constant diameter over its entire length, and a first dome portion 12 connected to one end portion in the axial direction of the cylindrical portion 11 (dome portion according to claim). And a second dome portion 13 (a dome portion recited in the claims) connected to the other end portion in the axial direction of the body portion 11. The inside of the liner 10 serves as a storage space 14 for storing fluid (hydrogen gas, natural gas, etc.). The liner 10 is formed into a predetermined shape by blow molding. As the material of the liner 10, a mixed resin of high density polyethylene (HDPE) and ethylene / vinyl alcohol copolymer resin (EVOH), polyamide resin, polypropylene resin, or the like is used.

  At the center of the first dome portion 12, a cylindrical projecting portion 15 having a penetrating shape that is coaxial with the axis of the trunk portion 11 is integrally formed. The cylindrical protruding portion 15 has a form protruding to the outside of the first dome portion 12. The external space of the liner 10 and the storage space 14 can communicate with each other via the internal space of the cylindrical protrusion 15. Of the outer surface of the first dome part 12, it is on the outer peripheral side of the cylindrical projecting part 15 and on the inner peripheral side of the outer peripheral edge of the first dome part 12 (the boundary between the body part 11 and the first dome part 12). The annular region is a first flat surface portion 16 that is substantially perpendicular to the axis of the body portion 11.

  A pair of first rotation restricting convex portions 17 are formed on the outer surface of the first flat portion 16 so as to face each other with the cylindrical projecting portion 15 interposed therebetween in the radial direction. The pair of first rotation restricting protrusions 17 are symmetrical with respect to the cylindrical protrusion 15. The first rotation restricting convex portion 17 is not connected to the outer periphery of the cylindrical projecting portion 15, and is disposed at a position radially outside the outer periphery of the cylindrical projecting portion 15. The outer peripheral edge of the first rotation restricting convex portion 17 is located on the outer peripheral edge of the first flat portion 16. The protrusion height of the first rotation restricting convex portion 17 with respect to the first plane portion 16 is the lowest at the outer peripheral side edge, and gradually increases toward the cylindrical protruding portion 15, and the inner peripheral side edge. Is the largest.

  A bulging portion 18 having a circular shape coaxial with the axis of the trunk portion 11 is integrally formed at the center of the second dome portion 13. The bulging portion 18 does not penetrate, and the other end portion of the body portion 11 is closed by the second dome portion 13. A circle on the outer peripheral side of the bulging portion 18 of the outer surface of the second dome portion 13 and on the inner peripheral side of the outer peripheral edge of the second dome portion 13 (the boundary between the trunk portion 11 and the second dome portion 13). The annular region is a second flat surface portion 19 that is substantially perpendicular to the axis of the body portion 11.

  A pair of second rotation restricting convex portions 20 are formed on the outer surface of the second flat surface portion 19 so as to face each other with the bulging portion 18 interposed therebetween in the radial direction. The pair of second rotation restricting convex portions 20 are symmetrical with respect to the bulging portion 18. The second rotation restricting convex portion 20 is not connected to the outer periphery of the bulging portion 18, and is arranged at a position radially outside the outer periphery of the bulging portion 18. The outer peripheral edge of the second rotation restricting convex part 20 is located on the outer peripheral edge of the second flat part 19. The protrusion height of the second rotation restricting convex portion 20 with respect to the second flat surface portion 19 is the lowest at the outer peripheral side edge, and gradually increases as it approaches the bulging portion 18, and at the inner peripheral side edge. Is the largest.

  The liner 10 is formed by the following blow molding method. At the time of molding, a substantially cylindrical parison (not shown) is pushed downward from a blow molding machine (not shown) with its axis line directed vertically. A rod (not shown) is accommodated in the extruded parison from below. The parison is sandwiched between the pair of molds 50, and the pressurized air supplied through the rod brings the parison into close contact with the cavity inner surface of the mold 50. Thereafter, when the parison is cured, the molding process of the liner 10 by the mold 50 is completed.

  On the outer periphery of the liner 10 formed by the mold 50, a parting line 21 is formed along the boundary between the pair of molds 50. The pair of molds 50 are formed with molding portions 51 for molding the pair of first rotation restricting protrusions 17 and the pair of second rotation restricting protrusions 20, respectively. Therefore, the parting line 21 passes through the center position in the circumferential direction of the outer surface of the first rotation restricting convex portion 17 and also passes through the center position in the circumferential direction of the outer surface of the second rotation restricting convex portion 20.

<First cap 22>
The first base 22 has a cylindrical first main body portion 23 penetrating in the axial direction, and a first flange portion 24 projecting radially outward from the base end portion of both axial end portions of the first main body portion 23. And a single part. A first female screw portion 25 is formed at the inner peripheral tip of the first main body portion 23. A valve 26 is attached to the first base 22 by being screwed into the first female screw portion 25.

  The first base 22 is attached to the liner 10 so as to cover the outer surface of the first dome portion 12. In the state where the first base 22 is attached, the base end portion of the first main body portion 23 is in close contact with the outer periphery of the cylindrical protruding portion 15, and the inner surface of the first flange portion 24 is the first flat portion 16 (the first dome portion 12. ). The first flange portion 24 has a circular shape concentric with the first main body portion 23, and the outer diameter of the first flange portion 24 is substantially the same as the outer diameter of the first flat surface portion 16.

  The first flange portion 24 is formed with a pair of first rotation restricting concave portions 27 arranged so as to face each other in the radial direction with the first main body portion 23 interposed therebetween. The pair of first rotation restricting recesses 27 are symmetric with respect to the axis of the first main body 23. The first rotation restricting recess 27 has a form penetrating from the inner surface of the first flange portion 24 (the surface facing the first dome portion 12) to the outer surface of the first flange portion 24. It is an open form.

  In a state where the first base 22 is attached to the first dome portion 12, the pair of first rotation restricting concave portions 27 are fitted into the pair of first rotation restricting convex portions 17. In the fitting portion between the first rotation restricting concave portion 27 and the first rotation restricting convex portion 17, the outer surface of the first rotation restricting convex portion 17 and the outer surface of the first flange portion 24 are flush with each other without a step. . Moreover, the outer peripheral side edge of the 1st rotation control convex part 17 and the outer periphery of the 1st flange part 24 are smoothly continuing with the substantially same curvature.

<Second base 28>
The second base 28 includes a columnar second main body portion 29 and a single second flange portion 30 projecting radially outward from the base end portion of both axial end portions of the second main body portion 29. One part. The second main body portion 29 is formed with a second female screw portion 31 having a shape in which a tip end surface thereof is recessed coaxially. The second base 28 is attached to the liner 10 so as to cover the outer surface of the second dome portion 13. In a state where the second base 28 is attached, the base end portion of the second main body portion 29 is in close contact with the outer periphery of the bulging portion 18, and the inner surface of the second flange portion 30 is the second flat surface portion 19 (second dome portion 13). It is in close contact with the outer surface. The second flange portion 30 has a circular shape concentric with the second main body portion 29, and the outer diameter of the second flange portion 30 is substantially the same as the outer diameter of the second planar portion 19.

  The second flange portion 30 is formed with a pair of second rotation restricting recesses 32 disposed so as to face each other in the radial direction with the second main body portion 29 interposed therebetween. The pair of second rotation restricting recesses 32 are symmetric with respect to the axis of the second main body portion 29. The second rotation restricting recess 32 has a form penetrating from the inner surface of the second flange portion 30 (the surface facing the second dome portion 13) to the outer surface of the second flange portion 30, and on the outer peripheral edge of the second flange portion 30. It is an open form.

  In a state where the second base 28 is attached to the second dome part 13, the pair of second rotation restricting recesses 32 are fitted into the pair of second rotation restricting protrusions 20. In the fitting portion between the second rotation restricting concave portion 32 and the second rotation restricting convex portion 20, the outer surface of the second rotation restricting convex portion 20 and the outer surface of the second flange portion 30 are continuous with each other without a step. . Moreover, the outer peripheral side edge of the 2nd rotation control convex part 20 and the outer periphery of the 2nd flange part 30 are smoothly continuing with the substantially same curvature.

<Fiber reinforced resin layer 33>
The fiber reinforced resin layer 33 is made of carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic, or the like. The fiber reinforced resin layer 33 is an outer peripheral region of the outer periphery of the body portion 11, a region of the first dome portion 12 on the outer peripheral side of the first planar portion 16, and an outer periphery of the second dome portion 13 of the second planar portion 19. It is formed across the outer region, the outer periphery of the first rotation restricting convex portion 17 and the second rotation restricting convex portion 20, and the outer periphery of the first base 22 and the second base 28.

  The fiber reinforced resin layer 33 is a filament winding method, that is, the fiber bundle 34 is impregnated with a liquid thermosetting resin on the outer surfaces of the liner 10 and the caps 22 and 28 that rotate about the axis of the body portion 11. Alternatively, it is formed by winding a semi-cured thermosetting resin impregnated in the fiber bundle 34 (prepreg fiber). The fiber bundle 34 is a bundle of thread-like fibers made of carbon fiber, glass fiber, Kepla fiber, or the like.

<Process for forming filament winding device and fiber reinforced resin layer 33>
The filament winding apparatus for winding the fiber bundle 34 around the liner 10 and the caps 22 and 28 includes a first shaft-like support member 41 that applies a rotational force to the liner 10 and a motor that rotationally drives the first shaft-like support member 41 ( (Not shown), a second shaft-like support member 42 coaxial with the first shaft-like support member 41, a motor (not shown) for rotating the second shaft-like support member 42, and a bobbin (not shown) for feeding the fiber bundle 34 (Omitted) etc. The distal end portion of the first shaft-shaped support member 41 is attached to the first base 22 so as to be integrally rotated by being screwed into the first female screw portion 25. The second shaft-like support member 42 is attached to the second base 28 so as to be integrally rotatable by being screwed into the second female screw portion 31.

  A process of forming the fiber reinforced resin layer 33 on the liner 10 will be described. First, the liner 10 blow-molded into a predetermined shape and attached with the caps 22 and 28 is conveyed to a predetermined filament winding position, and the first shaft-shaped support member 41 and the second shaft-shaped support member 42 are respectively moved to the first shape. Attached to the first base 22 and the second base 28. In this state, the first shaft-like support member 41 and the second shaft-like support member 42 are driven at the same peripheral speed to rotate the liner 10 and both the caps 22 and 28. A fiber bundle 34 fed out from the bobbin is wound around the outer surface of the rotating liner 10.

  In the step of winding the fiber bundle 34, shear in the rotational direction is applied to the interface between the first base 22 on the driving side that rotates integrally with the first shaft-shaped support member 41 and the liner 10 on the driven side that pulls the fiber bundle 34 from the bobbin. Force acts. Therefore, when the shearing force increases, there is a concern that the first base 22 slips due to slippage between the first base 22 and the liner 10. In addition, since a shearing force acts between the second base 28 that rotates integrally with the second shaft-shaped support member 42 and the liner 10, there is a concern that the second base 28 idles.

  As a countermeasure, in the present embodiment, the first rotation restricting convex portion 17 formed on the liner 10 and the first rotation restricting concave portion 27 formed on the first base 22 are fitted, and the second rotation restricting convex portion formed on the liner 10 is fitted. The second rotation restricting recess 32 formed in the part 20 and the second base 28 was fitted. At these fitting portions, the liner 10 and the first base 22 are in contact with each other in the circumferential direction, and the liner 10 and the second base 28 are in contact with each other in the circumferential direction, so that the liner 10, the first base 22, and the second base 28 are , Kept in a state of rotating integrally. After the winding process of the fiber bundle 34 is finished, the resin impregnated in the fiber bundle 34 is cured. By passing through the above process, the fiber reinforced resin layer 33 is formed and the manufacture of the pressure vessel A is completed.

<Effect of Example 1>
As described above, the pressure vessel A of the present embodiment includes the liner 10 in the form in which the first dome portion 12 and the second dome portion 13 are connected to the end portion of the substantially cylindrical body portion 11, and the first dome portion 12. A first base 22 that concentrically covers the outer surface of the second dome 13, a second base 28 that concentrically covers the outer surface of the second dome 13, and a fiber bundle 34 wound around the outer surface of the liner 10. And a fiber reinforced resin layer 33 covering the outer surface. A first rotation restricting convex portion 17 is formed in a region including the parting line 21 in the outer periphery of the first dome portion 12, and the first rotation restricting convex portion 17 has a first base 22 formed on the first base 22. One rotation restricting recess 27 is fitted. Further, a second rotation restricting convex portion 20 is formed in an area including the parting line 21 in the outer periphery of the second dome portion 13, and the second rotation restricting convex portion 20 has a second base 28 formed on the second base 28. A two-rotation restricting recess 32 is fitted.

  According to this configuration, the first rotation restricting convex portion 17 and the first rotation restricting concave portion 27 and the second rotation restricting convex portion 20 and the second rotation restricting concave portion 32 are fitted to each other with respect to the liner 10. The relative transfer of the first cap 22 and the second cap 28 is restricted. Therefore, in the step of winding the fiber bundle 34 around the liner 10 while rotating the first base 22 and the second base 28, the first base 22 and the second base 28 are idled without rotating the liner 10. Can be prevented. In addition, since the first rotation restricting convex portion 17 and the second rotation restricting convex portion 20 are arranged in the region including the parting line 21, in the step of molding the liner 10 with the blow molding die 50, It is possible to form the first rotation restricting convex portion 17 and the second rotation restricting convex portion 20.

  Moreover, since the 1st rotation control recessed part 27 is distribute | arranged so that it may open to the outer periphery of the 1st nozzle | cap | die 22 (1st flange part 24), from the rotation center when the 1st nozzle | cap | die 22 is rotationally driven, it is 1st. The radial dimension up to the fitting position between the rotation restricting concave portion 27 and the first rotation restricting convex portion 17 is ensured long. Therefore, the stress of the 1st rotation control convex part 17 when receiving the rotational force from the 1st nozzle | cap | die 22 is reduced. Similarly, since the second rotation restricting concave portion 32 is also arranged so as to open to the outer peripheral edge of the second base 28 (first flange portion 24), the second rotation restricting concave portion 32 is moved from the center of rotation when the second base 28 is rotationally driven. The dimension of the radial direction to the fitting position of the 2 rotation control recessed part 32 and the 2nd rotation control convex part 20 is ensured long. Therefore, the stress of the second rotation restricting convex portion 20 when receiving the rotational force from the second base 28 is reduced. Thereby, the deformation | transformation of the 1st rotation control convex part 17 and the 2nd rotation control convex part 20 can be prevented.

  Moreover, since the 1st rotation control recessed part 27 is the form opened to the outer surface of the 1st nozzle | cap | die 22, when the 1st nozzle | cap | die 22 is assembled | attached to the liner 10, the position of the 1st rotation control convex part 17 is confirmed visually. Can do. Similarly, since the second rotation restricting concave portion 32 is also open to the outer surface of the second base 28, the position of the second rotation restricting convex portion 20 is visually confirmed when the second base 28 is assembled to the liner 10. be able to. Therefore, it is excellent in workability.

  Further, the first rotation restricting convex portion 17 is fitted into the first rotation restricting concave portion 27 over the entire region in the thickness direction of the first base 22 (the axial direction of the liner 10). According to this configuration, the contact area between the inner surface of the first rotation restricting concave portion 27 and the outer surface of the first rotation restricting convex portion 17 is widened, so that the first force when receiving the rotational force from the first base 22 is obtained. The stress of the rotation restricting convex portion 17 is reduced. Thereby, the deformation | transformation of the 1st rotation control convex part 17 can be prevented. Similarly, since the second rotation restricting convex portion 20 is also fitted into the second rotation restricting concave portion 32 over the entire region in the thickness direction of the second base 28, The contact area with the outer surface of the two-rotation restricting convex portion 20 is increased. Thereby, since the stress of the 2nd rotation control convex part 20 when receiving the rotational force from the 2nd nozzle | cap | die 28 is reduced, the deformation | transformation of the 2nd rotation control convex part 20 can be prevented.

  Further, the outer surface of the first rotation restricting convex portion 17 and the outer surface of the first base 22 are continuous with each other. According to this configuration, there is no step or unevenness at the fitting portion between the first rotation restricting convex portion 17 and the first rotation restricting concave portion 27, and therefore there is no gap between the wound fiber bundle 34. Absent. Similarly, the outer surface of the second rotation restricting convex portion 20 and the outer surface of the second base 28 are also flush with each other. According to this configuration, there is no step or unevenness at the fitting portion between the second rotation restricting convex portion 20 and the second rotation restricting concave portion 32, and therefore there is no gap between the wound fiber bundle 34. Absent.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, a pair of rotation restricting convex portions and rotation restricting concave portions are formed so as to correspond to each other with the axis of the trunk portion interposed therebetween, but the number of rotation restricting convex portions and rotation restricting concave portions is one by one. It may be only.
(2) In the above-described embodiment, the formation region in the radial direction of the rotation restricting convex portion was only the outer peripheral side range than the cylindrical portion of the liner, but the rotation restricting convex portion is connected to the cylindrical portion. Also good.
(3) In the above embodiment, the rotation restricting recess is open at the outer peripheral edge of the base, but the rotation restricting concave may be arranged at a position closer to the center than the outer peripheral edge of the base.
(4) In the above embodiment, the rotation restricting recess is open on the outer surface of the base, but the rotation restricting convex is not open on the outer surface of the base, but only on the inner surface facing the dome. Also good.
(5) In the above embodiment, the outer surface of the rotation restricting convex portion and the outer surface of the base are continuous with each other, but a step or unevenness is generated at the fitting portion between the rotation restricting convex portion and the rotation restricting concave portion. Form may be sufficient.
(6) In the above embodiment, the rotation restricting convex portion is formed on both the first dome portion and the second dome portion, but the rotation restricting convex portion is one of the first dome portion and the second dome portion. You may form only in a dome part. In accordance with this, the rotation restricting recess may be formed only in one of the first and second caps.
(7) Although one of the pair of dome portions is in a closed form, the present invention can also be applied to a case where a cylindrical portion in a penetrating form is formed on both of the pair of dome portions.
(8) In the above embodiment, the first shaft-like support member and the second shaft-like support member are driven at the same peripheral speed in the step of winding the fiber bundle, but the second shaft-like support member is replaced with the first shaft-like support member. And you may make it carry around with a liner.

A ... Pressure vessel 10 ... Liner 11 ... Body 12 ... First dome (dome)
13 ... 2nd dome part (dome part)
17 ... 1st rotation control convex part (rotation control convex part)
20 ... 2nd rotation control convex part (rotation control convex part)
21 ... Parting line 22 ... First cap (base)
27: First rotation restricting recess (rotation restricting recess)
28 ... Second base (base)
32. Second rotation restricting recess (rotation restricting recess)
33 ... Fiber reinforced resin layer 34 ... Fiber bundle

Claims (5)

A liner in a form in which a dome part is connected to an end of a substantially cylindrical body part;
A base that concentrically covers the outer surface of the dome,
A fiber reinforced resin layer comprising a fiber bundle in a form wound around the outer surface of the liner, and covering the outer surface of the liner;
A rotation restricting convex portion formed in a region including a parting line in the outer periphery of the dome portion,
A pressure vessel comprising: a rotation restricting recess formed in the base and fitted into the rotation restricting protrusion.   The pressure vessel according to claim 1, wherein the rotation restricting recess is disposed so as to open to an outer peripheral edge of the base.   The pressure vessel according to claim 1 or 2, wherein the rotation restricting recess is open to the outer surface of the base.   The pressure vessel according to claim 3, wherein the rotation restricting convex portion is fitted into the rotation restricting concave portion over the entire region in the thickness direction of the base.   The pressure vessel according to claim 3 or 4, wherein an outer surface of the rotation restricting convex portion and an outer surface of the base are continuous in a flush manner.

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