JP2022053892A - Pressure container and device for producing blow molding - Google Patents

Abstract

To provide reduce die cost.SOLUTION: A pressure container 10 has a blow molding 11, and an outer reinforcement layer 12 surrounding the blow molding 11. The blow molding 11 has a liner 14 that is blow-molded from parison 51 so that a shank 16 and a dome 17 are combined, and a pipe 15 in close contact with the outer peripheral surface of the shank 16.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pressure vessel and a blow molded article manufacturing apparatus.

Patent Document 1 discloses a pressure vessel in which a reinforcing layer is formed on the outer surface of a resin liner. This type of liner is formed into a predetermined shape by blow molding. In blow molding, a parison extruded from an extruder is sandwiched between molds, and pressurized air is blown into the parison to press the parison against the mold.

Japanese Unexamined Patent Publication No. 2018-189178

The length of the pressure vessel depends on the volume that stores the fluid. In order to manufacture pressure vessels having different lengths, it is necessary to prepare a plurality of types of molds corresponding to the lengths of the pressure vessels. Therefore, the mold cost is high.

The present invention has been completed based on the above circumstances, and an object thereof is to reduce the mold cost.

The pressure vessel of the first invention is
It has a blow-molded body and an external reinforcing layer that surrounds the blow-molded body.
The blow molded body is
A liner made of parison and blow-molded so that the body and dome are integrated,
It has a pipe in close contact with the outer peripheral surface of the body portion.

The apparatus for manufacturing a blow molded article of the second invention is
A manufacturing device for molding a blow-molded body having a liner in which a body portion and a dome portion are integrally molded.
A pipe that forms the body by contacting a tubular parison,
A mold for forming the dome portion by contacting the parison is provided.
When the mold is opened, the mold is separated from the liner and the pipe, and the pipe is integrated with the body portion.

According to the first invention, a mold for forming a dome portion is arranged so as to be connected to an end portion of a pipe, and a liner having a predetermined shape is formed by bringing a parison into close contact with the mold and the pipe. Can be done. When molding liners with different lengths, it is only necessary to change the length of the pipe, so that the mold can be standardized. Since only one type of mold is required for a plurality of types of liners having different lengths, the cost of the mold can be reduced.

According to the second invention, when molding blow-molded bodies having different lengths, it is only necessary to change the length of the pipe, so that the mold can be standardized. Since only one type of mold is required for a plurality of types of blow molded products having different lengths, the cost of the mold can be reduced.

It is sectional drawing which shows the state before closing a mold in the manufacturing process of the blow molded article by the manufacturing apparatus of Example 1. FIG. It is a side sectional view showing the state which the blow-molded article was molded in the mold in the die-clamped state in the manufacturing process of the blow-molded article. It is sectional drawing of the pressure vessel molded by a manufacturing apparatus. It is a partially enlarged sectional view of the pressure vessel of FIG.

In the first invention, it is preferable that the inner diameter dimension of the end portion of the pipe is smaller than the outer diameter dimension of the portion of the outer peripheral surface of the liner adjacent to the pipe. According to this configuration, it is possible to prevent the liner and the pipe from being displaced in the axial direction.

In the first invention, it is preferable that the outer diameter dimension of the end portion of the pipe is larger than the outer diameter dimension of the portion of the outer peripheral surface of the liner adjacent to the pipe. According to this configuration, it is possible to prevent the external reinforcing layer from being displaced in the axial direction with respect to the blow molded body.

In the first invention, it is preferable that the end portion of the pipe is formed with a tapered portion whose outer peripheral surface is inclined with respect to the axis. According to this configuration, it is possible to prevent stress from concentrating on the contact portion between the end portion of the pipe and the external reinforcing layer.

In the first and second inventions, it is preferable that the pipe constitutes an internal reinforcing layer having a higher rigidity than the liner. According to this configuration, it is possible to prevent the body of the liner from being deformed.

In the second invention, it is preferable that the inner diameter dimension of the end portion of the pipe is smaller than the inner diameter dimension of the portion of the inner peripheral surface of the mold adjacent to the pipe. According to this configuration, it is possible to prevent the liner and the pipe from being displaced in the axial direction.

In the second invention, it is preferable that the end portion of the pipe is formed with a tapered portion whose outer peripheral surface is inclined with respect to the axis. According to this configuration, when the external reinforcing layer is formed on the outer peripheral surface of the blow molded body, it is possible to prevent stress from concentrating on the contact portion between the end portion of the pipe and the external reinforcing layer.

In the second invention, it is preferable that the outer diameter dimension of the end portion of the pipe is larger than the inner diameter dimension of the portion of the inner peripheral surface of the mold adjacent to the pipe. According to this configuration, when the external reinforcing layer is formed on the outer peripheral surface of the blow molded body, it is possible to prevent the external reinforcing layer from being displaced in the axial direction with respect to the blow molded body.

<Example 1>
Hereinafter, Example 1 embodying the present invention will be described with reference to FIGS. 1 to 4. In the following description, with respect to the vertical direction, the directions appearing in FIGS. 1 to 4 are defined as upward and downward as they are. Regarding the left-right direction, the directions appearing in FIGS. 1 to 4 are defined as left and right as they are.

As shown in FIG. 3, the pressure vessel 10 of this embodiment includes a blow molded body 11, an external reinforcing layer 12, and a base 13. The blow molded body 11 is manufactured by a blow molding method using the manufacturing apparatus 30. The blow molded body 11 has a liner 14 and a pipe 15. As an example of the material of the liner 14, a mixed resin of high density polyethylene (HDPE) and an ethylene / vinyl alcohol copolymer resin (EVOH) can be used.

As shown in FIG. 3, the pressure vessel 10 includes a body portion 10A and a dome portion 10B. The body portion 10A has a cylindrical shape with the axis directed in the vertical direction (vertical direction). The upper dome portion 10B is in a form of bulging upward from the upper end of the body portion 10A. The lower dome portion 10B is in the form of bulging downward from the lower end of the body portion 10A. The body portion 10A of the pressure vessel 10 is composed of a body portion 11A of the blow molded body 11 and a body portion 12A of the external reinforcing layer 12. The dome portion 10B of the pressure vessel 10 is composed of a dome portion 11B of the blow molded body 11 and a dome portion 12B of the external reinforcing layer 12.

As shown in FIG. 3, the body portion 11A of the blow molded body 11 has a cylindrical shape with the axis directed in the vertical direction (vertical direction). The body portion 11A of the blow molded body 11 is composed of a body portion 16 of a liner 14, which will be described later, and a pipe 15. The dome portion 11B of the blow molded body 11 is composed of the dome portion 17 of the liner 14, which will be described later.

As shown in FIG. 3, the liner 14 includes a body portion 16 and dome portions 17 on both upper and lower sides. The liner 14 is blow-molded so that the body portion 16 and the dome portion 17 are integrally formed by using the parison 51 described later as a material. The body portion 16 has a cylindrical shape with the axis directed in the vertical direction (vertical direction). The upper dome portion 17 is in a form of bulging upward from the upper end of the body portion 16. The lower dome portion 17 is in the form of bulging downward from the lower end of the body portion 16. At the center of the dome portion 17, a tubular portion 18 projecting in the vertical direction (vertical direction) is formed. The dome portion 17 has a large diameter portion 17A having a large diameter provided on the pipe 15 side in the vertical direction (vertical direction) and a small diameter portion 17B having a small diameter provided on the side opposite to the pipe 15 side. .. The small diameter portion 17B projects in a cylindrical shape in the vertical direction (vertical direction). A base 13 is attached to the small diameter portion 17B. The outer diameter dimension of the outer peripheral surface of the upper and lower ends of the body portion 16 is smaller than the maximum outer diameter dimension of the outer peripheral surface of the dome portion 17. That is, a step is formed between the body portion 16 and the dome portion 17.

As shown in FIG. 3, the pipe 15 has a cylindrical shape with the axis directed in the vertical direction (vertical direction). The pipe 15 constitutes an internal reinforcing layer having a higher rigidity than the liner 14. The pipe 15 is made of, for example, a metal or a fiber reinforced resin such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The pipe 15 is in close contact with the outer peripheral surface of the body portion 16. When molding the liners 14 having different lengths, it is only necessary to change the length of the pipe 15, so that the mold 33 described later can be shared.

As shown in FIG. 4, the end portion 19 of the pipe 15 is formed with a tapered portion 21 whose outer peripheral surface is inclined with respect to the axis. The tapered portion 21 has an inclination that approaches inward in the radial direction toward the end portion in the vertical direction (vertical direction). An end face 22 is present radially inside the end 19 of the pipe 15. The end surface 22 is provided between the inner peripheral surface of the pipe 15 and the tapered portion 21. The end face 22 is a plane orthogonal to the vertical direction.

As shown in FIG. 4, the portion 23 of the dome portion 17 on the pipe 15 side is a portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15. The portion 23 of the dome portion 17 on the pipe 15 side is in contact with the pipe 15. As shown in FIG. 3, the inner diameter dimension L1 of the end portion 19 of the pipe 15 is smaller than the outer diameter dimension L2 of the portion 23 on the pipe 15 side in the dome portion 17. As a result, the end portion 19 of the pipe 15 overlaps the portion 23 on the pipe 15 side of the dome portion 17 in the vertical direction. Therefore, it is possible to prevent the liner 14 and the pipe 15 from being displaced in the vertical direction (axial direction) due to the interference between the end portion 19 of the pipe 15 and the portion 23 on the pipe 15 side in the dome portion 17.

As shown in FIG. 4, the tapered portion 21 is connected to the outer peripheral surface of the portion 23 on the pipe 15 side of the dome portion 17 without a step. That is, in the radial direction of the liner 14, the height of the step between the body portion 16 and the dome portion 17 is about the same as the length of the end surface 22 of the pipe 15.

The external reinforcing layer 12 surrounds the blow molded body 11. The external reinforcing layer 12 is made of a fiber reinforced resin such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The external reinforcing layer 12 is formed so as to cover the entire outer peripheral region of the pipe 15 and the entire outer peripheral region of the dome portion 17. The external reinforcing layer 12 is formed by, for example, a filament winding method. That is, the outer reinforcing layer 12 has, for example, a fiber bundle (not shown) impregnated with a liquid thermosetting resin on the outer surface of the blow molded body 11 rotating about the axis, or the fiber bundle impregnated with thermosetting. It is formed by winding a semi-cured resin (prepreg fiber). The fiber bundle is a bundle of thread-like fibers made of carbon fiber, glass fiber, kepura fiber and the like.

As shown in FIG. 3, the maximum outer diameter dimension L3 of the end portion 19 of the pipe 15 is larger than the outer diameter dimension L2 of the portion 23 on the pipe 15 side in the dome portion 17. The outer diameter dimension L3 is, for example, the outer diameter dimension at the outermost position in the radial direction (the position farthest from the axis of the pipe 15) in the tapered portion 21. As a result, a part of the external reinforcing layer 12 is located on the outer side in the vertical direction with respect to the end portion 19 of the pipe 15. Therefore, it is possible to prevent the external reinforcing layer 12 from being displaced in the vertical direction (axial direction) with respect to the blow molded body 11 due to the interference between the end portion 19 of the pipe 15 and a part of the external reinforcing layer 12.

The manufacturing apparatus 30 is an apparatus for molding the blow molded body 11. As shown in FIG. 1, the manufacturing apparatus 30 includes a blow molding machine 31, an air supply means 32, a pipe 15, and four molds 33. The blow molding machine 31 is arranged above the air supply means 32, the pipe 15, and the four molds 33. The blow molding machine 31 extrudes a cylindrical parison 51, which is a material of the blow molded body 11, downward in the vertical direction.

As shown in FIG. 1, the air supply means 32 includes a rod 34, a support portion 35, and an air supply portion (not shown). The rod 34 is made of metal, for example. The rod 34 has an L-shaped cylinder shape. An air supply path (not shown) is formed inside the rod 34. The rod 34 is supported by the support portion 35. The straight portion on the tip end side of the rod 34 stands up along the vertical direction. A plurality of exhaust holes 36 for exhausting the inner air to the outside are formed in the straight portion on the tip end side of the rod 34. A pair of bases 13 are assembled at positions where a plurality of exhaust holes 36 are vertically sandwiched in a straight line portion on the tip end side of the rod 34. The base 13 is fitted on the outer peripheral surface of the rod 34. The air supply unit is configured as a compressor. The intake unit supplies compressed air to the air supply path from the base end side (the side opposite to the tip end side) of the rod 34.

As shown in FIG. 1, the pipe 15 is arranged so as to surround a straight portion on the tip end side of the rod 34. For example, the outer peripheral surface of the pipe 15 is supported by a support member (not shown). The pipe 15 is provided at the center position between the pair of bases 13 in the vertical direction (direction along the straight line portion on the tip end side of the rod 34). When molding the liners 14 having different lengths, it is only necessary to change the length of the pipe 15, so that the mold 33 can be shared.

The four molds 33 mold the parison 51 into a blow-molded body 11 having a predetermined shape in a molded state. As shown in FIG. 1, the pair of upper molds 33 face each other in parallel with the mold clamping and mold opening directions (left-right direction in FIG. 1) on the upper end side of the pipe 15. The pair of lower molds 33 face each other in parallel with the mold clamping and mold opening directions (left-right direction in FIG. 1) on the lower end side of the pipe 15. Each mold 33 has the same shape. Each mold 33 is formed with a cavity 37 having a concave surface facing the mold 33 facing the mold 33 in the vertical direction and the horizontal direction. The inner surface of the cavity 37 includes a molding surface for molding the entire region of the dome portion 17 of the liner 14 into a predetermined shape, and a surface that fits into the end portion 19 of the pipe 15 to position the pipe 15. .. The pair of upper molds 33 are molded concentrically with the parison 51 by approaching in the left-right direction, and are opened by separating them in the left-right direction. Similarly, the pair of lower molds 33 are molded concentrically with the parison 51 by approaching in the left-right direction, and are opened by separating them in the left-right direction.

As shown in FIG. 1, the inner surface of the cavity 37 includes a first forming surface 41, a second forming surface 42, a first fitting surface 43, and a second fitting surface 44. The inner surface of the cavity 37 has a first forming surface 41, a second forming surface 42, a first fitting surface 43, and an inner surface from the outside (the side opposite to the pipe 15 side) in the vertical direction toward the inside (the pipe 15 side). The second fitting surface 44 is connected in this order. The first forming surface 41 is a surface having a semicircular cross section having the same diameter over the entire vertical direction. The first forming surface 41 is a surface having a semicircular cross section having the same diameter as the diameter of the base 13. The second forming surface 42 is a surface having a semicircular cross section whose diameter increases from the side of the first forming surface 41 toward the side of the first fitting surface 43. The first forming surface 41 and the second forming surface 42 are smoothly connected in the vertical direction. The first fitting surface 43 is inclined with respect to the axis of the rod 34. The first fitting surface 43 is inclined so as to move outward in the radial direction toward the second fitting surface 44 side. The first fitting surface 43 has the same shape as the tapered portion 21 of the facing pipe 15. That is, the length of the first fitting surface 43 and the length of the tapered portion 21 are the same in the plane orthogonal to the circumferential direction (for example, the cut plane of FIG. 1). The second fitting surface 44 is a semicircular surface having the same diameter over the entire vertical direction. The second fitting surface 44 is a semicircular surface having the same diameter as the outer peripheral surface of the pipe 15.

As shown in FIG. 2, the portion 45 (the end on the first fitting surface 43 side) on the second forming surface 42 of the mold 33 on the pipe 15 side is adjacent to the pipe 15 on the inner peripheral surface of the mold 33. It is a part to be used. The inner diameter L1 of the end 19 of the pipe 15 is smaller than the inner diameter L4 of the portion 45 on the pipe 15 side of the second forming surface 42. This makes it possible to prevent the liner 14 and the pipe 15 from being displaced in the axial direction.

As shown in FIG. 2, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is larger than the inner diameter dimension L4 of the portion 45 on the pipe 15 side of the second forming surface 42 of the mold 33. As a result, when the external reinforcing layer 12 is formed on the outer peripheral surface of the blow molded body 11, it is possible to prevent the external reinforcing layer 12 from being displaced in the axial direction with respect to the blow molded body 11.

Next, the manufacturing procedure of the blow molded article 11 will be described. First, as shown in FIG. 1, the pipe 15 is arranged so as to surround the straight portion on the tip end side of the rod 34. With the pair of molds 33 on both upper sides open, the parison 51 is pushed out between the pair of molds 33 on the upper side and between the pair of molds 33 on the lower side. The parison 51 is extruded between the rod 34 and the inner peripheral surface of the pipe 15. After the parison 51 having a predetermined length is extruded, as shown in FIG. 2, a pair of upper and lower molds 33 are brought close to each other and molded. The mold 33 is arranged so as to be connected to the end 19 of the pipe 15. The first fitting surface 43 of the mold 33 is brought into surface contact with the tapered portion 21 of the pipe 15. A part of the outer peripheral surface of the pipe 15 on the end portion 19 side (the portion excluding the tapered portion 21) is brought into surface contact with the second fitting surface 44 of the mold 33. Once molded, the parison 51 is surrounded by a pair of upper and lower molds 33 and pipes 15 and housed in a housing (not shown).

After the mold is fastened, the parison 51 is inflated by the air supply means 32 and pressed against the inner surface of the mold 33 and the inner peripheral surface of the pipe 15. As a result, as shown in FIG. 2, a blow molded body 11 having a liner 14 in which the body portion 16 and the dome portion 17 are integrally molded and molded into a predetermined shape can be obtained. The body portion 16 is formed by bringing the parison 51 into contact with the inner peripheral surface of the pipe 15. The upper dome portion 17 is formed by bringing the parison 51 into contact with the inner surfaces of the pair of upper molds 33. The lower dome portion 17 is formed by bringing the parison 51 into contact with the inner surfaces of the pair of lower molds 33.

After the parison 51 is cured to some extent, the mold 33 is opened. When the mold 33 is opened, the mold 33 is separated from the liner 14 and the pipe 15, and the pipe 15 is integrated with the body portion 16. The pipe 15 is in close contact with the outer peripheral surface of the body portion 16. The blow molded body 11 is taken out from the mold 33, moved to a cooling booth (not shown), and cooled over time. With the above, the manufacturing process of the blow molded article 11 is completed.

Hereinafter, the effect of the first embodiment will be described. According to the pressure vessel 10 of the first embodiment and the manufacturing apparatus 30 of the blow molded body 11, the mold 33 for molding the dome portion 17 is arranged so as to be connected to the end portion 19 of the pipe 15. By bringing the parison 51 into close contact with the mold 33 and the pipe 15, the liner 14 having a predetermined shape can be formed. When molding the liners 14 having different lengths, it is only necessary to change the length of the pipe 15, so that the mold 33 described later can be shared. Since only one type of mold 33 is required for a plurality of types of liners 14 having different lengths, the cost of the mold 33 can be reduced.

Further, the inner diameter dimension L1 of the end portion 19 of the pipe 15 is smaller than the outer diameter dimension L2 of the portion 23 on the pipe 15 side (the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15) in the dome portion 17. This makes it possible to prevent the liner 14 and the pipe 15 from being displaced in the vertical direction (axis direction).

Further, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is larger than the outer diameter dimension L2 of the portion 23 on the pipe 15 side (the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15) in the dome portion 17. As a result, it is possible to prevent the external reinforcing layer 12, which will be described later, from being displaced in the vertical direction (axial direction) with respect to the blow molded body 11.

Further, a tapered portion 21 having an outer peripheral surface inclined with respect to an axis is formed at the end portion 19 of the pipe 15. As a result, it is possible to prevent stress from concentrating on the contact portion between the end portion 19 of the pipe 15 and the external reinforcing layer, as compared with the configuration in which the tapered portion 21 is not provided (the end portion 19 of the pipe 15 is angular). ..

Further, the pipe 15 constitutes an internal reinforcing layer having higher rigidity than the liner 14. According to this, it is possible to prevent the body portion 16 of the liner 14 from being deformed.

Further, the inner diameter dimension L1 of the end portion 19 of the pipe 15 is smaller than the inner diameter dimension L4 of the portion 45 on the pipe 15 side (the portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15) on the second forming surface 42. .. This makes it possible to prevent the liner 14 and the pipe 15 from being displaced in the axial direction.

Further, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is the inner diameter of the portion 45 on the pipe 15 side (the portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15) on the second forming surface 42 of the mold 33. It is larger than the dimension L4. As a result, when the external reinforcing layer 12 is formed on the outer peripheral surface of the blow molded body 11, it is possible to prevent the external reinforcing layer 12 from being displaced in the axial direction with respect to the blow molded body 11.

<Other Examples>
The present invention is not limited to the examples described in the above description and drawings, and for example, the following examples are also included in the technical scope of the present invention.
(1) In the first embodiment, the inner diameter dimension L1 of the end portion 19 of the pipe 15 is the outer diameter dimension of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17). Although set smaller than L2, the inner diameter dimension L1 of the end portion 19 of the pipe 15 is the outer diameter dimension L2 of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17). The same size as, or a size larger than the outer diameter size L2 of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17) may be used.
(2) In the first embodiment, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is the outer diameter of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17). Although set to be larger than the dimension L2, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is the outer diameter of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17). The dimension may be the same as the dimension L2, or may be smaller than the outer diameter dimension L2 of the portion of the outer peripheral surface of the liner 14 adjacent to the pipe 15 (the portion 23 on the pipe 15 side in the dome portion 17).
(3) In the first embodiment, the inner diameter L1 of the end 19 of the pipe 15 is set to a portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (a portion 45 on the pipe 15 side of the second forming surface 42). Although the inner diameter of the pipe 15 is set to be smaller than the inner diameter L4, the inner diameter L1 of the end 19 of the pipe 15 is a portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (a portion of the second forming surface 42 on the pipe 15 side). As a dimension larger than the inner diameter L4 which is the same as the inner diameter of 45) or the inner diameter L4 of the portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (the portion 45 on the pipe 15 side of the second forming surface 42). May be good.
(4) In the first embodiment, the outer diameter dimension L3 of the end portion of the pipe is set to the portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (the portion 45 on the pipe 15 side of the second forming surface 42). Although it is set to be larger than the inner diameter dimension L4, the outer diameter dimension L3 of the end portion 19 of the pipe 15 is a portion of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (a portion on the pipe 15 side of the second forming surface 42). 45) The same as the inner diameter L4, or smaller than the inner diameter L4 of the inner peripheral surface of the mold 33 adjacent to the pipe 15 (the portion 45 on the pipe 15 side of the second forming surface 42). May be good.
(5) In the first embodiment, the tapered portion 21 is formed at the end portion 19 of the pipe 15, but the end portion 19 of the pipe 15 may have a shape that does not have the tapered portion 21.
(6) In the first embodiment, instead of the tapered portion 21, a curved portion that is convex outward in the radial direction may be provided.
(7) In the first embodiment, the pipe 15 constitutes an internal reinforcing layer having a higher rigidity than the liner 14, but the material of the pipe 15 may be the same rigidity as the liner 14, and has a lower rigidity than the liner 14. It may be the one.

10 ... Pressure vessel 11 ... Blow molded body 11A ... Blow molded body body 11B ... Blow molded body dome 12 ... External reinforcing layer 14 ... Liner 15 ... Pipe (internal reinforcing layer)
16 ... Liner body 17 ... Liner dome 21 ... Tapered 23 ... Dome part on the pipe side (the part of the outer peripheral surface of the liner that is adjacent to the pipe)
30 ... Manufacturing equipment 33 ... Mold 51 ... Parison

Claims (6)

It has a blow-molded body and an external reinforcing layer that surrounds the blow-molded body.
The blow molded body is
A liner made of parison and blow-molded so that the body and dome are integrated,
A pressure vessel having a pipe in close contact with the outer peripheral surface of the body portion. The pressure vessel according to claim 1, wherein the inner diameter dimension of the end portion of the pipe is smaller than the outer diameter dimension of the portion of the outer peripheral surface of the liner adjacent to the pipe. The pressure vessel according to claim 1 or 2, wherein the outer diameter dimension of the end portion of the pipe is larger than the outer diameter dimension of the portion of the outer peripheral surface of the liner adjacent to the pipe. The pressure vessel according to any one of claims 1 to 3, wherein a tapered portion having an outer peripheral surface inclined with respect to an axis is formed at an end portion of the pipe. The pressure vessel according to any one of claims 1 to 4, wherein the pipe constitutes an internal reinforcing layer having a higher rigidity than the liner. A manufacturing device for molding a blow-molded body having a liner in which a body portion and a dome portion are integrally molded.
A pipe that forms the body by contacting a tubular parison,
A mold for forming the dome portion by contacting the parison is provided.
A blow molded article manufacturing apparatus in which the mold is separated from the liner and the pipe when the mold is opened, and the pipe is integrated with the body portion.

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