JP2018091410A - Pressure-resistant container - Google Patents

Abstract

A pressure-resistant container having a single-layer wall and formed of resin. A wall portion is a single layer and is formed of resin, and the wall portion is positioned on a body portion, one end of the body portion, and a side opposite to the one end. A first lid portion and a second lid portion are arranged at the other end and connected to the body portion, and the body portion has a cylindrical shape and extends in the direction of the central axis. The length is 1.0 times or more the outer diameter of the trunk portion, and the outer shape of the first lid portion and the second lid portion passes through the central axis and is parallel to the central axis. Provided is a pressure-resistant container having a curved cross-section that protrudes from the body side toward the outside. [Selection drawing] Fig. 1

Description

  The present invention relates to a pressure vessel.

  Various pressure-resistant containers have been conventionally used for storing and transporting liquids such as water and various gases such as hydrogen.

  For example, Patent Document 1 includes a deep-drawn, substantially hemispherical tank upper part, a deep-drawn, substantially hemispherical tank lower part, and a substantially cylindrical tank body, and the tank upper part and the tank body part. And the tank lower part are fitted so that the upper part of the tank and the lower part of the tank are inward of the tank body part, and the tank upper part protrudes inward in the vicinity of the upper end part and the lower end part of the tank body part. A circumferential rib part is provided, and the tank upper part and the tank body part are welded from the inside so that the end part of the tank upper part is in contact with the rib part of the tank body part, A tank body is disclosed in which a sealed container is formed by welding from the outside so that an end of the lower part of the tank is in contact with a rib part of the tank body. .

  Further, Patent Document 2 is a high-pressure tank comprising a liner and a reinforcing layer formed on the outer surface of the liner, and the liner is provided on at least a part of a region in contact with the reinforcing layer. There is disclosed a high-pressure tank that is subjected to a sticking suppression process that suppresses sticking to a reinforcing layer.

JP 2010-145066 A Japanese Patent Application Laid-Open No. 2015-017641

  However, in the hot water storage tank disclosed in Patent Document 1, a metal such as stainless steel is used, and there is a problem that the cost increases.

  Moreover, in the high-pressure tank disclosed in Patent Document 2, the wall portion of the tank is composed of a plurality of layers of a liner and a reinforcing layer, and there is a problem that the cost is increased in this case as well.

  Then, in view of the problem of the above-described conventional technology, an object of one aspect of the present invention is to provide a pressure vessel having a single wall and formed of resin.

According to one aspect of the present invention, the wall is a single layer and is formed of a resin,
The wall portion includes a trunk portion,
A first lid portion disposed on one end portion of the trunk portion and the other end portion located on the opposite side of the one end portion, and connected to the trunk portion; a second lid portion; Have
The barrel has a cylindrical shape, and the length of the barrel in the central axis direction is 1.0 times or more the outer diameter of the barrel,
The first lid portion and the second lid portion have a curved shape that is convex outward from the body side toward the outside in a cross section that passes through the central axis and is parallel to the central axis. Provide a pressure vessel.

  According to one embodiment of the present invention, it is possible to provide a pressure-resistant container having a single wall and formed of resin.

The cross-sectional schematic diagram of the pressure vessel which concerns on embodiment of this invention. Explanatory drawing of the relationship between the length L of the trunk | drum of the pressure-resistant container in Experimental example 1, and the outer diameter D of a trunk | drum, and the generated maximum stress. Explanatory drawing of the relationship between the thickness of the pressure vessel in Experimental example 2, and the generated maximum stress. Explanatory drawing of the relationship between the radius r3 of the connection part of the 1st cover part of the pressure-resistant container in Experimental example 3, and a 2nd cover part, and a medium inlet / outlet pipe | tube, and generation | occurrence | production maximum stress.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and the following embodiments are not departed from the scope of the present invention. Various modifications and substitutions can be made.

  The pressure vessel of the present embodiment has a single-layer wall portion and is formed of resin, and the wall portion is positioned on the barrel portion, one end portion of the barrel portion, and on the side opposite to the one end portion. A first lid portion disposed on the other end portion and connected to the trunk portion, and a second lid portion. The barrel portion has a cylindrical shape, and the length of the barrel portion in the central axis direction can be 1.0 times or more the outer diameter of the barrel portion. Further, the first lid portion and the second lid portion may have a curved shape that is convex from the body side toward the outside in a cross section that passes through the central axis and is parallel to the central axis. it can.

  Conventionally, in a pressure vessel, in order to exhibit sufficient pressure resistance performance, the wall portion of the pressure vessel has been formed of a metal such as stainless steel or has a structure in which a plurality of layers are laminated. However, as described above, when using a metal such as stainless steel or having a structure in which a plurality of layers are laminated, there is a problem that the cost increases.

  Therefore, the inventors of the present invention have intensively studied about making the wall portion a single layer, that is, a single layer and forming a pressure vessel made of resin. As a result, it has been found that by setting the shape of the body portion to a predetermined shape, the maximum stress generated when pressure is applied to the inside of the pressure resistant vessel can be suppressed, and the pressure resistance performance can be improved, and the present invention has been completed.

  Hereinafter, the configuration of the pressure vessel of the present embodiment will be described with reference to FIG.

  FIG. 1 is a view schematically showing a cross section of the pressure vessel 10 of the present embodiment on a plane that passes through and is parallel to the central axis C of the pressure vessel 10 of the present embodiment.

  As shown in FIG. 1, the pressure vessel 10 of the present embodiment can have a wall portion 11 that defines a region for storing a medium such as liquid or gas. The wall portion 11 can include a body portion 111, a first lid portion 112, and a second lid portion 113.

  The first lid portion 112 and the second lid portion 113 are connected to the trunk portion 111 on one end portion 111a of the trunk portion 111 and the other end portion 111b located on the opposite side of the one end portion 111a. Can be arranged. In addition, since the pressure vessel 10 of the present embodiment can be integrally formed by, for example, a blow method or the like, the body portion 111, the first lid portion 112, and the second lid portion 113 are a continuous integral member. can do.

  According to the study by the inventors of the present invention, the body 111 is formed into a cylindrical shape, and the length L in the central axis C direction, that is, the z-axis direction in the drawing, is 1 of the outer diameter D of the body 111. It was found that a pressure vessel having sufficient pressure resistance can be obtained by setting the ratio to 0.0 times or more. This is because the length L of the barrel 111 in the direction of the central axis C is 1.0 times or more the outer diameter D of the barrel 111, so that the pressure vessel 10 This is because the applied pressure can be released to the body portion 111, and the pressure resistance performance of the entire pressure container 10 can be enhanced.

  The length L of the trunk portion 111 in the direction of the central axis C is more preferably 1.2 times or more the outer diameter D of the trunk portion 111. Note that the outer diameter D of the body 111 means the diameter of the outer shape of the body 111.

  The upper limit value of the ratio of the length L of the trunk portion 111 in the direction of the central axis C to the outer diameter D of the trunk portion 111 is not particularly limited, and can be arbitrarily selected according to the installation location. For example, the length L of the trunk portion 111 in the direction of the central axis C is preferably 10 times or less, more preferably 5 times or less of the outer diameter D of the trunk portion 111.

  The specific size of the length L of the trunk portion 111 in the central axis C direction is not particularly limited, and can be selected depending on the capacity required for the pressure-resistant container 10, the ease of manufacture, and the like. The length L in the central axis C direction of the body portion 111 is preferably, for example, 100 mm or more and 2000 mm or less, and more preferably 300 mm or more and 1000 mm or less.

  Further, the specific size of the outer diameter D of the body 111 is not particularly limited, and can be selected depending on the capacity required for the pressure vessel 10, ease of manufacture, and the like. The outer diameter D of the body 111 is preferably, for example, 100 mm or more and 500 mm or less, and more preferably 150 mm or more and 300 mm or less.

  As described above, the first lid portion 112 and the second lid portion 113 are respectively attached to one end portion 111a of the body portion 111 and the other end portion 111b located on the opposite side of the one end portion 111a. Can be arranged.

  The first lid portion 112 and the second lid portion 113 will be described below. In addition, since the 1st cover part 112 and the 2nd cover part 113 can have the same structure, in the following description, for example, the curves 112a and 112b use the 1st cover part 112 side as an example. Is explained.

  The outer shapes of the first lid portion 112 and the second lid portion 113 are not particularly limited. For example, in the cross section that passes through the central axis C of the pressure-resistant vessel 10 and is parallel to the central axis C, the trunk portion 111. It can have a convex curved shape from the side toward the outside. That is, it can also be called a convex substantially hemispherical shape from the body 111 side toward the outside.

  The first lid portion 112 and the second lid portion 113 have a single arc curve, that is, a single sector shape, in a cross section passing through the central axis C of the pressure vessel 10 and parallel to the central axis C. It can also be a shape. The first lid portion 112 and the second lid portion 113 are outer shapes obtained by rotating a contour curve in a cross section passing through the central axis C of the pressure vessel 10 and parallel to the central axis C around the central axis C as a rotation axis. Can have a shape. For this reason, in the above-mentioned case, the shape of the 1st cover part 112 and the 2nd cover part 113 can be made into the shape of a part of sphere, ie, a spherical crown, or a ball belt.

  However, if the outer shape of the first lid portion 112 and the second lid portion 113 in a cross section passing through the central axis C of the pressure vessel 10 and parallel to the central axis C is a single arc curve, the pressure vessel There is a possibility that the height direction of 10, that is, the length in the z-axis direction in FIG.

  Therefore, in the pressure vessel 10 of the present embodiment, the outer shape of the first lid portion 112 and the second lid portion 113 is an arc shape in a cross section passing through the central axis C and parallel to the central axis C. It is preferable to have the above curve. Of the two or more curves, the curve 112a arranged on the body 111 side has the same tangent A as the body 111, and among the two or more curves, adjacent curves, for example, the curve in FIG. 112a and curve 112b preferably have the same tangent line B.

  As described above, the outer shape of the first lid portion 112 and the second lid portion 113 has two or more curves that are arc-shaped in a cross-section passing through the central axis C and parallel to the central axis C. The size of the container 10 in the height direction can be shortened.

  Further, when the outer shape of the first lid portion 112 and the second lid portion 113 has two or more curves that are arc-shaped in a cross section passing through the central axis C and parallel to the central axis C as described above. The curve 112a arranged on the body 111 side has the same tangent A as the body 111, and among the two or more curves, the adjacent curves have the same tangent, thereby forming a smooth curve as a whole. . For this reason, it is particularly preferable from the viewpoint of increasing pressure resistance.

  Regarding the outer shapes of the first lid portion 112 and the second lid portion 113, in the case where there are two or more curves having an arc shape in a cross section passing through the central axis C and parallel to the central axis C, the two or more curves concerned Among them, the curve 112a disposed on the body 111 side preferably has a central angle θ of 40 ° or more and 60 ° or less.

  Setting the central angle θ of the curve 112a to 60 ° or less is preferable because the maximum stress generated when pressure is applied to the pressure resistant container can be sufficiently suppressed and the pressure resistance performance can be improved. Further, by setting the center angle θ of the curve 112a to 40 ° or more, the length of the curve 112a arranged on the body 111 side can be made sufficiently long, and the first lid portion 112 and the second lid portion can be obtained. 113 is preferable because it can be formed more easily.

  The radius r1 of the curve 112a is not particularly limited, but is preferably shorter than the radius R of the body 111, for example, and may be, for example, 1/3 or more and 2/3 or less of the radius R of the body 111.

The position of the center O ₁ of the curve 112a is not particularly limited, and may be a position corresponding to the radius r1 of the curve 112a on the surface of the one end 111a and the other end 111b of the body 111. it can.

There is no particular limitation on the curve other than placement curves 112a of the body portion 111 side, for example, body portion 111 of the non-arranged curve 112a to the side curve, for example, the curve 112b is the center O ₂ is, on the central axis C Preferably it is located. This is because by setting it on the central axis C, the shape of the lid can be made symmetrical, and the stress applied to the lid can be well distributed to the trunk. The radius r2 of the curve other than the curve 112a arranged on the body 111 side, for example, the curve 112b is not particularly limited, but is preferably set so as to have the same tangent with the adjacent curve.

  In addition, the 1st cover part 112 and the 2nd cover part 113 do not need to be the same external shape, and may differ. However, it is preferable to have the same outer shape in consideration of ease of manufacture and the like.

  Cylindrical medium inlet / outlet pipes 12 and 13 may be connected to one or more selected from the first lid portion 112 and the second lid portion 113. By connecting the medium inlet / outlet pipes 12 and 13, a medium such as a liquid or gas can be supplied into the pressure vessel 10, and the medium can be supplied from the pressure vessel 10 to the outside.

  The shape of the connecting portions 121 and 131 between one or more selected from the first lid portion 112 and the second lid portion 113 and the medium inlet / outlet pipes 12 and 13 is not particularly limited, but is concave and has a radius r3 of 4 mm. It is preferable to have the above arc shape.

  This is because when the shape of the connecting parts 121 and 131 is concave and the radius r3 is 4 mm or more, the generated maximum stress is suppressed particularly when pressure is applied to the inside of the pressure resistant vessel, and the pressure resistance performance is improved. Because it can.

  The upper limit value of the radius r3 is not particularly limited, but is preferably 10 mm or less, for example.

  Although the thickness of the wall part 11 of the pressure vessel 10 of this embodiment is not specifically limited, It is preferable that it is 8 mm or more. This is because the thickness of the wall 11 of the pressure vessel 10 is 8 mm or more, for example, when the pressure is applied to the pressure vessel 10, the maximum stress generated in the pressure vessel 10 is suppressed, and the pressure resistance of the pressure vessel 10 is reduced. This is because the performance can be sufficiently enhanced.

  Moreover, although it does not specifically limit about the upper limit of the thickness of the wall part 11, Since the weight of the pressure-resistant container 10 will increase if it increases too much, it is preferable to set it as 10 mm or less, for example.

  In addition, although it demonstrated centering on the external shape of the pressure vessel of this embodiment so far, the pressure vessel 10 of this embodiment forms the area | region by the wall part 11 which has predetermined | prescribed substantially uniform thickness. Can do. For this reason, the shape on the inner side of the pressure vessel 10 also has a shape that follows the outer shape, and is a shape that conforms to the outer shape.

  Further, when the medium inlet / outlet pipes 12 and 13 are connected, the medium inlet / outlet pipes 12 and 13 can also be formed integrally with the wall part 11 by a blow method or the like. It can be configured in the same manner.

The resin forming the wall portion 11 of the present embodiment is not particularly limited. For example, the resin group of modified polyphenylene ether, polyphenylene sulfide, polyamide 11, polyamide 12, polysulfone, polyethersulfone, and polyetherimide is used. One or more selected resins can be used. In addition, two or more kinds of resins selected from the above resin group can be mixed and used.

  Also, a mixture of one or more resins selected from the above resin group and one or more resins selected from the second resin group of polyethylene, polystyrene, polypropylene, polyamide, and polyphenylene sulfide can be used.

  When improving the pressure resistance and heat resistance, it is preferable that the resin forming the wall portion of the pressure vessel 10 of the present embodiment contains a modified polyphenylene ether.

  As resin which forms the wall part 11 of this embodiment, the fiber reinforced resin containing various fibers can also be used. As the fiber used in this case, for example, one or more selected from glass fiber, carbon nanofiber, cellulose nanofiber and the like can be used. As the resin, the resins described above can be used.

  In addition, when providing the medium entrance / exit pipe | tube 12 and 13 as stated above, the material is not specifically limited, For example, the same material as the wall part 11 can be used.

  In addition, when the medium inlet / outlet pipes 12 and 13 described above are provided, a cap (not shown) can be provided on the medium inlet / outlet pipes 12 and 13 as necessary. The configuration of the cap is not particularly limited, as long as the cap can be attached to the medium inlet / outlet pipes 12 and 13 and the openings of the medium inlet / outlet pipes 12 and 13 can be closed.

  When the cap is provided, the material is not particularly limited. For example, at least one selected from modified polyphenylene ether, polyphenylene sulfide, polyamide 11, polyamide 12, polysulfone, polyethersulfone, and polyetherimide is used. Can be used.

  The use of the pressure vessel of the present embodiment is not particularly limited, and can be used to accommodate various liquids and various media such as gas.

  For example, the pressure vessel of the present embodiment can be a gas tank that stores various gases.

  In addition, the pressure vessel of the present embodiment can be a liquid tank that stores various liquids. In particular, in recent years, it may be required to store water or heated hot water and supply it as needed. Therefore, it can be used as a water tank or a hot water tank.

Specific examples will be described below, but the present invention is not limited to these examples.
[Experimental Example 1]
Using the pressure-resistant container 10 shown in FIG. 1 as a model, the maximum stress generated in the pressure-resistant container was calculated by finite element analysis using the analysis software LISA Fine Elemental Analysis.

  In Experimental Example 1, the pressure vessel 10 has a wall part 11 and medium inlet / outlet pipes 12 and 13, and the wall part 11 and the medium inlet / outlet pipes 12 and 13 are a single layer, and the wall thickness is 8 mm. .

  The first lid portion 112 and the second lid portion 113 have the same shape, and the outer shapes of the first lid portion 112 and the second lid portion 113 pass through the central axis C and the central axis. In a cross section parallel to C, the shape has a curved shape that is convex from the body 111 side toward the outside. Specifically, in a cross section that passes through the central axis C and is parallel to the central axis C, the first lid portion 112 and the second lid portion 113 have two curved lines, that is, a curved line 112a and a curved line 112b. It was set as the external shape which has. The body 111 and the curve 112a have the same tangent line A at their contact points, and the curve 112a and the curve 112b have the same tangent line B at their contact points. In addition, the shape on the inner side is also a shape according to the outer shape.

At this time, the radius r1 of the curve 112a was 70 mm, and the central angle θ was 50 °. The center O _{2 of the} curve 112b is formed so as to be located on the central axis C.

  Further, the outer diameters of the medium inlet / outlet pipes 12 and 13 are 10 mm, and the connection parts 121 and 131 to the first lid part 112 and the second lid part 113 are concave and have an arc shape with a radius r3 of 10 mm.

  Regarding the pressure vessel 10 having such a configuration, the outer diameter D of the body portion 111 is within a range of 180 mm to 340 mm, and the length L of the body portion 111 in the central axis C direction is within a range of 170 mm to 650 mm. The change was made so that the products were substantially the same, and the change in the maximum generated stress was calculated when the pressure vessel 10 was 85 ° C. and the internal pressure was 1.75 MPa.

  Note that the maximum generated stress is calculated assuming that the ends of the medium inlet / outlet pipes 12 and 13 are closed by caps.

  The results are shown in Table 1 and FIG. In Table 1, Experimental Example 1-1 and Experimental Example 1-2 are comparative examples, and Experimental Example 1-3 to Experimental Example 1-6 are examples.

表１に示した結果からも明らかなように、胴部の長さＬ／胴部の外径Ｄが１．０以上となることで、大幅に発生最大応力を抑制できていることが確認できる。

As is apparent from the results shown in Table 1, it can be confirmed that the maximum stress generated can be significantly suppressed by the length L of the body portion / the outer diameter D of the body portion being 1.0 or more. .

For example, since the breaking strength at 85 ° C. of the modified polyphenylene ether is 29.1 MPa, even when the wall portion 11 of the pressure vessel 10 and the medium inlet / outlet pipes 12 and 13 are formed of a single layer and modified polyphenylene ether, When the length L of the body portion / the outer diameter D of the body portion is 1.0 or more, it was confirmed that the body had pressure resistance performance of 1.75 MPa or more even when heated to 85 ° C.
[Experiment 2]
The experiment was performed except that the length L of the body portion / the outer diameter D of the body portion was fixed to 1.2, and the wall portion 11 and the thickness of the medium inlet / outlet pipes 12 and 13 were changed within a range of 7 mm to 11 mm. The generated maximum stress was calculated in the same manner as in Example 1.

  The results are shown in Table 2 and FIG. Experimental Examples 2-1 to 2-5 are all examples.

表２に示した結果からも明らかなように肉厚を８ｍｍ以上とすることで、特に発生最大応力を低減できることが確認できた。
［実験例３］
胴部の長さＬ／胴部の外径Ｄを１．２に固定し、媒体出入管１２、１３と、第１蓋部１１２、第２蓋部１１３との接続部１２１、１３１の半径ｒ３を３ｍｍ〜１０ｍｍの範囲で変化させた点以外は、実験例１の場合と同様にして発生最大応力を算出した。

As is clear from the results shown in Table 2, it was confirmed that the maximum generated stress can be particularly reduced by setting the thickness to 8 mm or more.
[Experiment 3]
The length L of the body part / the outer diameter D of the body part is fixed to 1.2, and the radius r3 of the connection parts 121 and 131 between the medium inlet / outlet pipes 12 and 13 and the first cover part 112 and the second cover part 113 is fixed. The maximum generated stress was calculated in the same manner as in Experimental Example 1 except that was changed in the range of 3 mm to 10 mm.

  The results are shown in Table 3 and FIG. Experimental Examples 3-1 to 3-5 are all examples.

表３に示した結果からも明らかなように半径ｒ３を４ｍｍ以上とすることで、特に発生最大応力を低減できることが確認できた。

As is clear from the results shown in Table 3, it was confirmed that the maximum generated stress can be particularly reduced by setting the radius r3 to 4 mm or more.

DESCRIPTION OF SYMBOLS 10 Pressure-resistant container 11 Wall part 111 Body part 111a One end part 111b The other end part 112 The 1st cover part 113 The 2nd cover parts 114 and 115 Medium extraction port C Center axis

Claims (8)

The wall is a single layer and is made of resin,
The wall portion includes a trunk portion,
A first lid portion disposed on one end portion of the trunk portion and the other end portion located on the opposite side of the one end portion, and connected to the trunk portion; a second lid portion; Have
The barrel has a cylindrical shape, and the length of the barrel in the central axis direction is 1.0 times or more the outer diameter of the barrel,
The first lid portion and the second lid portion have a curved shape that is convex outward from the body side toward the outside in a cross section that passes through the central axis and is parallel to the central axis. Pressure vessel. In a cross section passing through the central axis and parallel to the central axis,
The outer shape of the first lid portion and the second lid portion has two or more curves that are arc shapes,
Of the two or more curves, the curve arranged on the trunk side has the same tangent as the trunk,
The pressure-resistant container according to claim 1, wherein adjacent curves among the two or more curves have the same tangent.   The pressure-resistant container according to claim 2, wherein a center angle of a curve arranged on the body portion side of the two or more curves is 40 ° or more and 60 ° or less. A cylindrical medium inlet / outlet pipe is connected to one or more selected from the first lid and the second lid,
The one or more selected from the first lid and the second lid and a connecting portion between the medium inlet and outlet pipes are concave and have an arc shape with a radius of 4 mm or more. The pressure vessel according to any one of 1 to 3.   The pressure vessel according to any one of claims 1 to 4, wherein the wall portion has a thickness of 8 mm or more.   The pressure vessel according to any one of claims 1 to 5, wherein the resin contains a modified polyphenylene ether.   The pressure vessel according to any one of claims 1 to 6, which is a gas tank. The pressure vessel according to any one of claims 1 to 6, which is a liquid tank.

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