JP6448788B2 - Pressure vessel - Google Patents

Description

  The present invention relates to a pressure vessel, and more particularly to a pressure vessel in which a boss is attached to the outside of a resin liner.

  As a pressure vessel for storing compressed gas, a composite type pressure vessel having a resin cylindrical liner and a reinforcing outer layer made of fiber reinforced resin provided outside the liner is known (for example, a patent). Reference 1).

  As a method for forming the reinforcing outer layer, a filament winding method is known in which reinforcing fibers impregnated with a resin are wound around the outer surface of a liner, and then the resin is cured by heat treatment to complete the reinforcing outer layer. The filament winding method is performed by chucking both ends or one end of the liner and winding reinforcing fibers around the outer surface of the liner while rotating the liner. For this reason, the cap member attached to the head portion (one end portion) of the liner constitutes one chucking portion, and a boss for chucking is attached to the tail portion (other end portion) of the liner.

JP 2001-524653 A

  When the liner is rotated in the chucking state in the case of a mounting structure in which the male thread protrudes from the tail of the liner and the female thread formed on the boss engages with the male thread. In addition, the screw fastening of the boss to the liner may be loosened. When this looseness occurs, the boss moves in a direction away from the liner, the reinforcing fiber is not normally wound around the liner, and the pressure resistance of the pressure vessel may be deteriorated due to poor winding of the reinforcing fiber.

  The problem to be solved by the present invention is to avoid loosening the screw fastening of the boss to the liner.

  The pressure vessel according to the present invention has a resin liner (12) having a first threaded portion (28) and a second threaded portion (34) engaged with the first threaded portion (28). The second screw portion (34) is fastened to the first screw portion (28) to be attached to the outside of the liner (12), the boss (32), the liner (12) and the liner The boss (32) is provided, and the boss (32) is prevented from rotating in a direction in which the fastening of the first screw portion (28) and the second screw portion is loosened with respect to the liner (12). And a rotation suppression unit (42, 44).

  According to this configuration, the boss (32) is prevented from rotating in a direction in which the fastening of the first screw portion (28) and the second screw portion (34) is loosened with respect to the liner (12).

  In the pressure vessel according to the present invention, preferably, the rotation suppressing portion includes at least one convex portion (42) formed on one of the contact surfaces of the liner and the boss and the convex portion ( 42) at least one recess (44) engageable.

  According to this structure, a rotation suppression part is comprised, without requiring an additional component.

  In the pressure vessel according to the present invention, preferably, the convex part (42) is formed in a ratchet tooth shape by a gentle slope (42A) and a steep slope (42B) continuous with the most convex part of the gentle slope (42A), The concave portion (44) is formed in a ratchet tooth shape by a gentle slope (44A) and a steep slope (44B) continuous with the most concave portion of the gentle slope (44A), and the first screw portion (28) and the second A ratchet that allows rotation in a direction in which the first screw portion (28) and the second screw portion (34) are loosened.

  According to this configuration, it is easy for the boss (32) to rotate with respect to the liner (12) in a direction in which the fastening between the first screw portion (28) and the second screw portion (34) is loosened. It is reliably prevented by the structure ratchet.

  In the pressure vessel according to the present invention, preferably, the convex portion (42) and the concave portion (44) are formed in complementary shapes to the steep slopes (42B, 44B) and engage with each other. 44C).

  According to this configuration, the boss (32) rotates relative to the liner (12) in a direction in which the fastening of the first screw portion (28) and the second screw portion (34) is loosened. Definitely blocked. Further, the boss (32) can be prevented from coming off in the mounting direction.

  In the pressure vessel according to the present invention, preferably, the pair of the convex portion (42) and the concave portion (44) is a circle centered on the first screw portion (28) or the second screw portion (34). It is formed at a plurality of locations in the circumferential direction.

  According to this configuration, the first screw portion (28) and the second screw portion (34) are compared with the case where the pair of the convex portion (42) and the concave portion (44) is formed only at one place. The force which prevents rotating in the direction which loosens a fastening with becomes strong.

  According to the pressure vessel of the present invention, the screw fastening of the boss to the liner is not loosened by the action of the rotation suppressing portion.

The longitudinal cross-sectional view which shows Embodiment 1 of the pressure vessel by this invention The expansion exploded perspective view of the principal part of the pressure vessel by Embodiment 1 The partial cross-section expansion perspective view of the principal part of the pressure vessel by Embodiment 1 The expanded sectional view of the principal part which shows immediately before completion of the fastening of the boss | hub of the pressure vessel by Embodiment 1 The expanded sectional view of the principal part which shows the fastening completion state of the boss | hub of the pressure vessel by Embodiment 1 The expanded sectional view of the principal part which shows the fastening completion state of the boss | hub of Embodiment 2 of the pressure vessel by this invention The expanded sectional view which shows the type | mold structure which shape | molds the principal part of the pressure vessel by Embodiment 2 The expansion disassembled perspective view of the principal part of Embodiment 3 of the pressure vessel by this invention The expansion disassembled perspective view of the principal part of Embodiment 4 of the pressure vessel by this invention

  Below, Embodiment 1 of the pressure vessel by this invention is demonstrated with reference to FIGS.

  As shown in FIG. 1, the pressure vessel 10 includes a resin liner 12 that accommodates a gas or liquid inside, and a fiber reinforced resin reinforcing outer layer (fiber reinforced resin layer provided outside the liner 12. 14).

  The material of the liner 12 is selected depending on the object to be accommodated and the filling conditions. Examples of the material of the liner 12 include polyethylene (PE), high density polyethylene (HDPE), polyamide, polyketone, polyphenylene sulfide (PPS), and the like. In the present embodiment, the liner 12 is formed by blow molding using these materials. The method for forming the liner 12 is not limited to blow molding.

  The shape of the liner 12 serves as a base of the shape of the pressure vessel 10 in a completed state, and is usually a shape that can be further reduced in weight relative to the high-pressure container, for example, as shown in FIG. In addition, a shape having a cylindrical body and a substantially hemispherical end that closes both axial ends of the body is selected.

  The reinforcing outer layer 14 is constituted by an FRP layer (fiber reinforced plastic layer) and becomes a main structural member in the pressure-resistant structure, and is formed by a filament winding method. In the filament winding method, a reinforcing fiber (filament) or woven fabric impregnated with a resin is wound around the outer surface of the liner 12 excluding the attachment portion of the cap member 22 and the tail boss 32 described later, and then the resin is cured. Thus, the reinforcing outer layer 14 is formed.

  The resin used for the reinforcing outer layer 14 is generally an epoxy resin because of its high strength. A phenolic resin may be used in the case where thermal stability is required. As the fiber, a high-strength and high-elasticity fiber is often used, and for example, carbon fiber, glass fiber, silica fiber, aromatic polyamide resin fiber, etc. are common. These fibers or a cloth woven with fibers is impregnated with the resin described above to form an FRP layer.

  At one end of the substantially hemispherical shape of the liner 12, that is, at the center of the head portion 16, a cylindrical portion 20 having a male screw 18 formed on the outer periphery is formed to project outward. The cylindrical portion 20 extends in the axial direction of the liner 12 and defines a pouring port 21 that communicates with the inside of the liner 12. A female screw 24 formed on the inner periphery of a substantially cylindrical base member 22 is engaged with the male screw 18. The base member 22 is made of a metal such as aluminum, and is fixed to the head portion 16 by fastening the male screw 18 and the female screw 24 described above. The base member 22 is sometimes called a head boss.

  A bolt 30 having a male thread (first threaded portion) 28 formed on the outer periphery is formed to protrude outwardly at the other end of the substantially hemispherical shape of the liner 12, that is, at the center of the tail portion 26. The bolt 30 extends in the axial direction of the liner 12. A female thread (second threaded portion) 34 formed at the center of the substantially cylindrical tail boss 32 is threadedly engaged with the bolt 30. The tail boss 32 is made of a metal such as aluminum, and is fixed to the tail portion 26 by screwing the male screw 28 and the female screw 34 described above.

  The base member 22 and the tail boss 32 are arranged concentrically with each other on the central axis of the liner 12, and a chuck of a winding machine (not shown) during the winding process of the fiber or woven fabric forming the FRP layer by the filament winding method. ) To be chucked (gripped). Thus, the liner 12 is supported on both ends, and in this state, the liner 12 is rotated around its own central axis, whereby the fiber or woven fabric is wound around the liner 12.

  Next, details of the attachment structure of the tail boss 32 will be described with reference to FIGS.

  A circular recess 36 that is recessed in a thin dish shape is formed at the center of the tail portion 26. The tail boss 32 has a cylindrical portion 38 and a flange portion 40 formed at one end of the cylindrical portion 38. A center hole 43 for centering chucking is formed at the center of the other end of the cylindrical portion 38. The flange portion 40 is a complement of the recess portion 36 and is fitted into the recess portion 36. The bottom surface 36A of the recessed portion 36 and the front end surface 40A of the flange portion 40 form an abutting surface that is opposed to each other in the axial direction of the liner 12.

  On the bottom surface 36A, a plurality of convex portions 42 are formed at two equal intervals around the central axis of the bolt 30 (male screw 28). Each convex portion 42 has a substantially rectangular shape or a substantially trapezoidal shape in a plan view, and has a ratchet tooth shape (non-return shape) including a gentle slope 42A and a steep slope 42B continuous with the most convex portion of the gentle slope 42A. A plurality of recesses 44 are formed at two positions around the central axis of the female screw 34 at equal intervals on the distal end surface 40A. The concave portion 44 is a concave portion having the same shape as the convex portion 42, has a substantially rectangular shape or a substantially trapezoidal shape in plan view, and has a ratchet tooth shape (non-return) by a gentle slope 44A and a steep slope 44B continuous with the most concave portion of the gentle slope 44A. Shape). The steep slope 42B stands substantially perpendicular to the bottom surface 36A, and the steep slope 44B stands substantially perpendicular to the tip face 40A.

  The convex portion 42 and the concave portion 44 are engaged with each other by screwing of the male screw 28 and the female screw 34. In this engagement, rotation of the tail boss 32 relative to the liner 12 in the direction in which the male screw 28 and the female screw 34 are screwed together (screwing direction) is allowed by the gentle slopes 42A and 44A, but the front end surface 40A abuts against the bottom surface 36A. When the state (attachment complete state) is reached, as shown in FIGS. 3 and 5, the tail boss 32 is fastened to the liner 12 with the male screw 28 and the female screw 34 by the contact between the steep slopes 42 </ b> B and 44 </ b> B. Rotation in the loosening direction is prevented. Thus, the convex part 42 and the recessed part 44 make the rotation suppression part by a ratchet.

  In this manner, in the state where the tail boss 32 is attached with the front end surface 40A contacting the bottom surface 36A, the tail boss 32 is fastened to the liner 12 with the male screw 28 and the female screw 34 by the engagement of the convex portion 42 and the concave portion 44. Rotation in the loosening direction is reliably prevented by a ratchet with a simple structure.

  Thereby, during the winding process of the fiber or woven fabric forming the FRP layer by the filament winding method, the screw fastening between the male screw 28 and the female screw 34 is not loosened, and the tail boss 32 does not move away from the liner 12. . Therefore, the fiber or woven fabric is normally wound around the liner 12 during the winding process of the FRP layer, and the pressure resistance performance of the pressure vessel 10 is guaranteed by preventing the winding failure of the fiber or woven fabric.

  Since the rotation suppressing portion is formed by the convex portion 42 and the concave portion 44 formed on the liner 12 and the tail boss 32, no additional parts are required and the structure is simple. Since the pair of the convex portion 42 and the concave portion 44 is provided at a plurality of locations (two locations) around the central axis of the male screw 28 or the female screw 34, the tail boss 32 is attached to the liner 12 as compared with the case of one location. The force that prevents the male screw 28 and the female screw 34 from rotating in the loosening direction is increased. Thereby, during the winding process of the FRP layer, the screw fastening between the male screw 28 and the female screw 34 is more reliably prevented from loosening.

  Next, a pressure vessel according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 6, portions corresponding to those in FIG. 5 are denoted by the same reference numerals as those in FIG. 5, and description thereof is omitted.

  In the second embodiment, overhangs 42 </ b> C and 44 </ b> C having complementary shapes are formed on the steep slope 42 </ b> B of the convex portion 42 and the steep slope 44 </ b> B of the concave portion 44. The overhang 42C projects forward from the end of the steep slope 42B on the connection side with the gentle slope 42A. The overhang 44C protrudes forward from the end of the steep slope 44B on the connection side with the tip surface 40A.

  As described above, the overhangs 42C and 44C alternately protrude forward from the steep slopes 42B and 44B, and in the state where the tail boss 32 is attached (completely engaged) with the front end surface 40A abutting the bottom surface 36A, it looks like “tenon engagement”. Engage with each other. This reliably prevents the steep slope 44B on the tail boss 32 side from over the steep slope 42B on the liner 12 side, and reliably prevents the tail boss 32 from rotating in a direction in which the screw fastening between the male screw 28 and the female screw 34 is loosened. . In addition, the tail boss 32 can be prevented from coming off in the mounting direction (axial direction).

  FIG. 7 shows an example of a molding die for the liner 12 according to the second embodiment. The mold for the liner 12 includes two-part molds 100A and 100B. Partition surfaces 102A and 102B of the molds 100A and 100B are set at a portion of the steep slope 42B of the convex portion 42 including the overhang 42C. As a result, the convex portion 42 including the overhang 42C is molded without causing any trouble during the mold release.

  Next, Embodiment 3 of the pressure vessel according to the present invention will be described with reference to FIG. In FIG. 8, parts corresponding to those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and description thereof is omitted.

  In the third embodiment, the convex portion 42 and the concave portion 44 each have a water droplet shape or a tear shape in a plan view, and are provided at three equal intervals around the central axis of the male screw 28 or the female screw 34. The third embodiment and the first embodiment are substantially the same except for the shape and number of the convex portions 42 and the concave portions 44 in plan view. Therefore, the third embodiment can provide the same operations and effects as those of the first embodiment.

  Next, Embodiment 4 of the pressure vessel according to the present invention will be described with reference to FIG. 9, parts corresponding to those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and description thereof is omitted.

In the fourth embodiment, a large number of convex portions 42 and concave portions 44 are radially formed around the central axis of the male screw 28 or the female screw 34 without any interval, and each has a substantially sector shape in plan view. As a result, the bottom surface 36A and the tip surface 40A are in the form of a chrysanthemum with ratchet teeth.

  In the fourth embodiment, since there are a large number of the convex portions 42 and the concave portions 44 around the central axis of the male screw 28 or the female screw 34, the force that prevents the male screw 28 and the female screw 34 from rotating in the loosening direction becomes strong. . In addition, it is possible to cope with variations in the rotational position of the tail boss 32 when the attachment to the liner 12 with the front end surface 40A abutting against the bottom surface 36A is completed (fastening completion). That is, the tail boss 32 can be fixed at an arbitrary rotational position. Except for this, the fourth embodiment and the first embodiment are substantially the same, and the fourth embodiment can provide the same operations and effects as the first embodiment.

  Although the present invention has been described above with reference to preferred embodiments thereof, the present invention is not limited to such embodiments and can be deviated from the spirit of the present invention, as will be readily understood by those skilled in the art. It is possible to change appropriately within the range not to be. For example, the steep slopes 42B and 44B may be inclined in the undercut direction with respect to the bottom surface 36A or the tip surface 40A. Further, the convex portion 42 and the concave portion 44 may have a shape other than the ratchet tooth shape, such as an isosceles triangle. The convex portion 42 may be formed on the tail boss 32 and the concave portion 44 may be formed on the liner 12. The rotation suppressing part by the convex part 42 and the concave part 44 may be provided between the head part 16 and the base member 22. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Pressure vessel 12 Liner 14 Reinforcement outer layer 16 Head part 18 Cylindrical part 20 Cylindrical part 21 Discharge port 22 Base member 26 Tail part 28 Male thread 30 Bolt 32 Tail boss 34 Female thread 36 Recessed part 36A Bottom face 38 Cylindrical part 40 Flange part 40A Front end surface 42 Convex part 42A Slow slope 42B Steep slope 42C Overhang 43 Center hole 44 Recess 44A Slow slope 44B Steep slope 44C Overhang

Claims (2)

A resin liner having a first threaded portion;
A boss that has a second threaded portion that engages with the first threaded portion, and is attached to the outside of the liner by fastening the second threaded portion to the first threaded portion;
Provided in the liner and the boss, eh Bei and suppressing rotation inhibiting portion that the boss is rotated in the direction in which the fastening is loosened and the second threaded portion and the first threaded portion with respect to the liner ,
The rotation suppressing portion includes at least one convex portion formed on one of the contact surfaces of the liner and the boss, and at least one concave portion formed on the other and engageable with the convex portion. ,
The convex part is formed into a ratchet tooth shape by a gentle slope and a steep slope continuous with the most convex part of the gentle slope, and the concave part has a ratchet tooth shape with a gentle slope and a steep slope continuous with the concave part of the gentle slope. Formed, allowing rotation in a direction in which the first screw portion and the second screw portion are fastened, and preventing rotation in a direction in which the fastening of the first screw portion and the second screw portion is loosened. Make a ratchet,
The said convex part and the said recessed part are pressure vessels which have an overhang which is formed in a shape complementary to each other on each said steep slope, and engages each other . The pressure vessel according to claim 1 , wherein the convex portion and the concave portion are formed at a plurality of locations around a central axis of the first screw portion or the second screw portion.

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