JP2017009084A - Pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit strength deterioration of a metal mouth piece of a pressure container which is caused by fatigue.SOLUTION: A pressure container includes: a resin container body 1; a resin outer shell 3 provided on an outer surface of the container body 1; and a metallic mouth piece 2 provided at an inlet/outlet part 11 of the container body 1. The mouth piece 2 includes: a cylindrical mouth piece body 21 having a through hole which serves as a passage for a content of the container body 1; and a protection member 22 which protects an inner surface of the through hole of the mouth piece body 21. The mouth piece body 21 is fixed to the container body 1, and the protection member 22 is detachably fixed to the mouth piece body 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pressure vessel suitable for containing gas, liquefied gas, and the like.

  In order to use, transport, and store various gases, liquefied gases, etc., pressure vessels having pressure resistance are used. Conventionally, pressure vessels made of metal have been the mainstream, but recently, various pressure vessels having a resin liner (container body) and an outer shell (reinforcing layer) covering the outer surface of the liner have been proposed. Yes. Usually, the pressure vessel is provided with a metal base provided with a sealing member such as an O-ring.

Patent Document 1 describes a structure in which a base of a resin pressure vessel is configured to be detachable so that a seal member can be easily replaced. Specifically, the metal base is composed of a cylindrical outer fitting and an inner fitting that supports the outer fitting, and the inner fitting is attached to the inside of the liner inlet and outlet. The outer fitting is screwed together. By removing the outer fitting, the seal member attached to the outer fitting can be replaced.
Further, Patent Document 2 discloses a configuration in which a base is inserted into an inlet / outlet of a liner, and a flange of the base is coupled to a pressing fitting provided on the outer peripheral surface of the liner with a bolt.

JP-A-9-222198 JP 2008-101677 A

In recent years, the use of pressure vessels has been diversified, and there is a concern that the deterioration of the die may occur due to the contact between the contents of the pressure vessel and the die for a long time. In order to prevent such deterioration, it is desirable to replace the base before deterioration of the base occurs.
The configuration of Patent Document 1 allows replacement of a sealing member such as an O-ring, but does not assume the replacement of the base, and the inner end fitting cannot be attached or detached.
In Patent Document 2, the replacement of the base is not assumed, but the base is fixed with a bolt and can be removed. However, the work of exchanging the entire base is cumbersome and expensive.
An object of this invention is to provide the pressure vessel which can prevent deterioration of a metal nozzle | cap | die easily at low cost.

The pressure vessel of the present invention comprises a resin container main body, a resin outer shell provided on the outer surface of the container main body, and a metal base provided at an entrance / exit of the container main body, The base includes a cylindrical base body provided with a through-hole serving as a flow path for the contents of the container body, and a protective member that protects the inner surface of the through-hole of the base body. It is fixed to the container body, and the protective member is detachably fixed to the base body.
The length of the base body in the axial direction is preferably 5 to 30 cm.
It is preferable that the said container main body is cylindrical shape and the entrance / exit part is provided in the both ends of the axial direction.

  According to the pressure vessel of the present invention, in the metal base, the deterioration of the base can be easily prevented by replacing the protective member protecting the inner surface of the through hole. In addition, only the protective member needs to be replaced, and it is not necessary to replace the base body, thereby reducing the cost.

It is sectional drawing which shows one Embodiment of the pressure vessel which concerns on this invention. It is sectional drawing which shows the structure of the nozzle | cap | die vicinity in 1st Embodiment of the pressure vessel which concerns on this invention. It is sectional drawing which shows the structure of the nozzle | cap | die vicinity in 2nd Embodiment of the pressure vessel which concerns on this invention.

<First Embodiment>
1 and 2 show a first embodiment of a pressure vessel according to the present invention, FIG. 1 is a sectional view showing the whole, and FIG. 2 is a sectional view showing a structure near a base.
The pressure vessel shown in FIGS. 1 and 2 includes a resin container main body 1, a metal base 2, and a resin outer shell 3 provided on the outer surface of the container main body 1. Reference numeral 4 in the figure denotes an arbitrary connecting member that is airtightly connected to the opening of the base 2, and is, for example, a valve, a plug, a pipe, or the like.
The base 2 has a cylindrical shape. In FIG. 2, the outer side (outer side of the container) in the axial direction (indicated by reference symbol X) of the base 2 is on the upper side and the inner side in the axial direction (inner side of the container) is lower. Let it be the side.

The container body 1 is a cylindrical hollow container, and the base 2 and the container body 1 are coaxial. In this embodiment, the entrance / exit part 11 of the content is provided in the both ends of the axial direction of the container main body 1. As shown in FIG. The periphery of the entrance / exit portion 11 is a substantially mortar-like (convex inward) recess 12. The entrance / exit portion 11 is cylindrical and is provided so as to protrude outward from the container.
The base 2 includes a metal base body 21 having a through hole serving as a flow path for the contents, and a metal protection member 22 that protects the inner surface of the through hole of the base body 21.

The base body 21 has a cylindrical shape coaxial with the base 2. A first flange portion 23 that fits into the recess 12 of the container body 1 is provided at the lower end of the base body 21. On the inner peripheral surface of the first flange portion 23, a step portion 23 a that comes into contact with the end surface of the entrance / exit portion 11 of the container body 1 is provided, and the inner peripheral surface of the first flange portion 23 and the outer periphery of the entrance / exit portion 11. The surface is screwed together. Reference numeral 23b indicates a threaded portion. The base body 21 is fixed to the container body 1 by this screwing.
A second flange portion 24 is provided on the outer peripheral surface of the base body 21, and the outer shell 3 is provided so as to cover the lower side of the second flange portion 24. That is, the base of the base body 21 is covered with the outer shell 3.
Between the second flange portion 24 of the base body 21 and the upper end surface 26 of the base body 21, a third flange portion 25 protruding from the outer surface is provided as necessary.
On the inner peripheral surface of the base body 21, stepped portions 27 and 28 that increase in diameter toward the upper end surface 26 are provided.
As the length of the base body 21 in the axial direction (X direction) (indicated by the symbol L1 in the figure) is longer, the contact area between the base 2 and the contents is larger, so the effect of applying the present invention is greater. In the embodiment in which the base body 21 protrudes from the outer shell 3 as in this embodiment, the length L1 in the axial direction of the base body 21 is, for example, 5 to 40 cm, and preferably 5 to 30 cm.

The protection member 22 has a substantially cylindrical shape, and the lower end portion is fitted into the access portion 11 of the container body 1. A sealing member 30 such as an O-ring is provided at the lower end portion of the protective member 22, whereby the contact portion between the protective member 22 and the entrance / exit portion 11 of the container body 1 is kept airtight.
On the outer peripheral surface of the protection member 22, step portions 31 and 32 that engage with the step portions 27 and 28 on the inner peripheral surface of the base body 21 are provided. The peripheral surface is screwed together. Reference numeral 33 denotes a screwing portion. The protective member 22 is detachably fixed to the base body 21 by this screwing.
A flange portion 34 is provided at the upper end of the protective member 22, and the lower surface of the flange portion 34 and the upper end surface 26 of the base body 21 abut in a state where the protective member 22 is screwed into the base body 21. It is like that.
The shape of the inner peripheral surface on the upper side of the protection member 22 is designed according to the shape of the connecting member 4 attached thereto. For example, the connection member 4 is attached to the inner peripheral surface of the protection member 22 by screwing. In addition, a seal member is appropriately provided so that the contact portion between the connection member 4 and the protection member 22 is kept airtight.
The thickness of the protective member 22 in the direction perpendicular to the axial direction is not particularly limited. However, in the aspect in which the base body 21 protrudes from the outer shell 3 as in this embodiment, 2-20 mm is preferable at the thinnest position. 2-10 mm is more preferable. If the thickness is equal to or greater than the lower limit of the above range, there is a tendency that problems in wearing due to deformation of the protective member 22 tend not to occur, and if the thickness is equal to or smaller than the upper limit, weight reduction of the protective member 22 can be achieved. It tends to be excellent in handling at the time.

As the metal constituting the base body 21 and the protection member 22, a known material can be used for the base of the pressure vessel. For example, aluminum alloy, stainless steel (SUS), carbon steel, alloy steel, brass, etc. are mentioned.
The metal which comprises the nozzle | cap | die main body 21 and the protection member 22 may mutually be the same, and may differ.
In the present embodiment, the metal material constituting the base body 21 is an aluminum alloy, and the metal material constituting the protective member 22 is an aluminum alloy.

As a material of the container body 1, a known material can be appropriately used in the pressure vessel. For example, polyolefin resins such as high-density polyethylene resin, crosslinked polyethylene, polypropylene resin, and cyclic olefin resin; polyamide resins such as nylon 6, nylon 6,6, nylon 11, and nylon 12; polyester such as polyethylene terephthalate and polybutylene terephthalate Examples thereof include engineering resins such as acrylonitrile-butadiene-styrene copolymer (ABS) resin, polyacetal resin, polycarbonate resin, polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, or polyimide resin.
The container body 1 may be composed of a single layer or multiple layers using one kind of resin, or may be composed of a composite material using two or more kinds of resins.

In the present embodiment, the outer shell 3 is made of a fiber reinforced resin formed by arranging reinforcing fibers impregnated with a resin and then curing the resin.
The pressure vessel according to the present embodiment is, for example, a known method such as a filament winding method or a tape winding method, in which a base body 21 is fixed to the outer surface around the entrance / exit portion 11 of a container body 1 manufactured by a known method such as blow molding. The outer shell 3 can be manufactured by the method described above.

Examples of the reinforcing fiber for forming the outer shell 3 include carbon fiber, glass fiber, organic high modulus fiber (for example, aramid fiber, ultra high strength polyester fiber), metal fiber, or ceramic fiber. It is possible to use two or more types in combination.
Examples of the carbon fiber include pitch type, polyacrylonitrile (PAN type), rayon type, and the like, and any carbon fiber may be used.
In particular, the pitch system is preferable in that a high elastic modulus is easily obtained, and the PAN system is preferable in that a high strength is easily obtained. These may be combined.
Examples of the resin for forming the outer shell 3 include thermosetting or photocurable resins such as epoxy resins, unsaturated polyester resins, urea resins, phenol resins, melamine resins, polyurethane resin polyimide resins, vinyl ester resins; polyamide resins And polyester resins such as polyethylene terephthalate and polybutylene terephthalate, engineering plastics such as ABS resin, polyether ketone and polyphenylene sulfide, and thermoplastic resins such as polyolefin resins such as polypropylene and poly-4-methyl-1-pentene.

<Effect>
In the pressure vessel of this embodiment, a protective member 22 is provided in the through hole of the base body 21. The lower end portion of the protection member 22 penetrates the entrance / exit portion 11 of the container body 1 in an airtight manner and opens into the container body 1, and the upper end of the protection member 22 is above the upper end of the base body 21 ( It is located on the outer side of the container body 1. That is, the entire inner surface of the through hole of the base body 21 is covered with the protective member 22, so that the base body 21 does not come into contact with the contents of the container body 1. For this reason, deterioration of the base body 21 due to the contents does not occur. Moreover, since the protection member 22 which contacts the contents of the container body 1 is fixed to the base body 21 by screwing, the protection member 22 can be easily removed and replaced.
Therefore, there is no need to replace the base body 21, and the deterioration of the base 2 can be easily prevented at low cost.

Such a base 2 is preferably provided at a site where the base is likely to deteriorate due to the contents of the container body 1 in particular.
For example, as in the example of FIG. 1, in the pressure vessel in which the entrance / exit portions 11 are provided at both ends in the axial direction of the cylindrical container body 1, the axial direction is used or stored as a substantially vertical direction. A liquid residue (drain) may stay in the main body 1. In such a case, since the residue and the metal cap of the lower entrance / exit portion 11 will be in contact with each other for a long time, by providing the base 2 of the present embodiment at least in the entrance / exit portion 11, Deterioration of the die 2 due to the liquid residue can be easily prevented at low cost.

The base body 21 is not limited to the configuration of the present embodiment as long as the base body 21 is fixed to the container body 1 without being in contact with the contents of the container body 1.
Further, the protection member 22 may be detachably fixed in the through hole of the base body 21 so that the contents of the container body 1 are in contact with the protection member 22 and not the base body 21. It is not limited to the configuration of the form.

Second Embodiment
FIG. 3 shows a second embodiment of the pressure vessel according to the present invention and is a cross-sectional view showing the structure near the base. In FIG. 3, the same components as those in FIG.
The base 40 of the present embodiment is significantly different from the base 2 of the first embodiment in that the base body 41 does not protrude from the outer shell 3 and only the protective member 42 protrudes from the outer shell 3.
In the present embodiment, the base body 41 includes a first flange portion 43 that fits into the concave portion 12 of the container body 1 at the lower end portion, and a second flange portion 44 at the upper end portion. The outer shell 3 is provided so as to cover the outer peripheral surface of the base body 41, and the upper end surface 44 a of the base body 41 and the outer surface 3 a of the outer shell 3 are substantially flush with each other.
The base body 41 and the entrance / exit part 11 of the container body 1, and the base body 41 and the protection member 42 are screwed together (the screwing part is not shown).

In the present embodiment, the length L2 of the base body 41 in the axial direction is, for example, 1 to 15 cm, preferably 2.5 to 10 cm, and more preferably 4 to 7 cm.
The thickness of the protective member 42 in the direction perpendicular to the axial direction is not particularly limited, but in the present embodiment, the thickness is preferably 2 to 20 mm, more preferably 2 to 10 mm. Moreover, the thickness of the part which protrudes from the outer shell 3 of the protection member 42 is not specifically limited, From the viewpoint of intensity | strength and weight reduction, the inside of the range of 2-20 mm is preferable, and the inside of the range of 5-15 mm is more preferable.
Also in this embodiment, the same effect as 1st Embodiment is acquired.

DESCRIPTION OF SYMBOLS 1 Container main body 2,40 Base 3 Outer shell 4 Connection member 11 Entrance / exit part 12 Recessed part 21, 41 Base main body 22,42 Protection member 23,43 1st flange part 23a Step part 23b Screw part 24,44 2nd flange Part 25 Third flange part 26 Upper end face (axially outer side) of the base body 27, 28 Step part of inner peripheral surface of base part 30 Seal member 31, 32 Step part of outer peripheral surface of protective member 33 Threaded part 34 Protective member flange

Claims (3)

A resin container main body, a resin outer shell provided on the outer surface of the container main body, and a metal base provided at the entrance and exit of the container main body,
The base includes a cylindrical base body provided with a through hole serving as a flow path for the contents of the container body, and a protective member that protects the inner surface of the through hole of the base body.
The pressure vessel, wherein the base body is fixed to the container body, and the protective member is detachably fixed to the base body.   The pressure vessel according to claim 1, wherein a length of the base body in the axial direction is 5 to 30 cm.   The pressure vessel according to claim 1 or 2, wherein the vessel main body has a cylindrical shape and is provided with entrances and exits at both ends in the axial direction.

Images