JP2000046296A - Plastic liner type frp pressure vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm a remaining liquid level through visual observation of appearance as gas barrier properties are ensured. SOLUTION: The outer surface of a plastic liner 1 is covered with a metallic foil 2 and the outside thereof is further reinforced with FRP layers 4 and 5. In a so formed plastic liner type FRP pressure vessel, the plastic liner 1 and the FRP layers 4 and 5 are formed of a transparent or translucent material and a slit 3 extending along the direction of the length of the plastic liner 1 or a peripheral direction is formed in the metallic foil 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight, plastic liner type FRP pressure vessel having excellent gas barrier properties, in which the liquid level of a liquefied gas such as liquefied petroleum gas (LPG) can be visually confirmed. Things.

[0002]

2. Description of the Related Art Pressure vessels for fuels such as liquefied petroleum gas (LPG) and compressed natural gas (CNG) and medical and disaster prevention such as air respirators are mainly used. Steel containers have been used in the past. However, since these steel pressure vessels are heavy and are often carried and used, their weight reduction has been strongly desired. As a solution to this demand, an FRP pressure vessel in which an FRP layer is laminated on the outer surface of a plastic liner has been developed.

The plastic liner type FRP pressure vessel (hereinafter sometimes referred to as a vessel) generally has a container body structure as shown in FIG.
The helical layer 5 and the FRP hoop layer 4 are provided. The plastic liner 1 is usually made by a blow molding method or a rotational molding method. In addition, FRP helical layer 5, hoop layer 4
Is made by the FW method (filament winding method). The FW method is a molding method in which a fiber bundle is impregnated with a resin, and the fiber bundle is sequentially wound around a plastic liner while applying a tension. In the helical layer 5, the fiber bundle is
It is wound mainly in the pressure vessel axial direction (longitudinal direction) to reinforce the pressure vessel in the axial direction. In the hoop layer 4, the fiber bundle is wound in the pressure vessel circumferential direction to reinforce the pressure vessel in the circumferential direction. Will carry it. Glass fiber or Kepler fiber having high rigidity is used as the reinforcing fiber. Such a plastic liner-type FRP pressure vessel is lightweight, and when the glass fiber is used as the reinforcing fiber, the plastic liner 1 and the helical layer 5 and the hoop layer 4 are used.
Is transparent or pale white (semi-transparent), so that the filling amount and the remaining amount can be easily confirmed by visual inspection, but there is a problem that gas barrier properties are poor and gas leakage occurs.

Further, as shown in FIG. 7, in order to prevent gas leakage, the entire outer periphery of the plastic liner 1 is covered with a metal foil 2 of aluminum or the like, and further, fiber-reinforced plastic layers 4, 5 are formed on the outer periphery by the FW method. A plastic liner type FRP pressure vessel has been proposed. As the metal foil 2, a metal foil such as aluminum, tin, or copper is used, but aluminum is often used in terms of gas barrier properties and cost. As described above, the plastic liner type FRP pressure vessel in which the metal foil 2 is laminated and coated has a gas barrier property, but it is difficult to visually confirm the liquid level of the liquefied gas in the vessel at the time of gas filling or use. In addition, the filling amount and the remaining amount are indirectly grasped by weight measurement or the like, which causes inconvenience.

In view of the circumstances described above, an object of the present invention is to provide a plastic liner-type FRP pressure vessel capable of visually confirming the remaining liquid level while visually confirming the gas barrier property. is there.

[0006]

In order to achieve the above object, a plastic liner type FRP pressure vessel according to the present invention (Claim 1) covers the outer surface of a plastic liner with a metal foil and further covers the outside thereof. In a plastic liner type FRP pressure vessel reinforced with an FRP layer, the plastic liner and the FRP layer are formed of a transparent or translucent material, and a slit is formed in the metal foil along a length direction or a circumferential direction of the plastic liner. Is provided.

In the present invention, since the outer surface of the plastic liner is covered with a metal foil having slits, the plastic liner is excellent in gas barrier properties. Also, since the inner plastic liner and the outer FRP layer sandwiching the metal foil are formed of a transparent or translucent material (plastic and reinforcing fiber), the amount of the contents in the container can be easily adjusted through the slit. It can be confirmed visually.

In the plastic liner type FRP pressure vessel according to the present invention, it is preferable that the plastic used for the liner is polyethylene or polypropylene, and the FRP layer is GFRP so that the amount of the contents can be seen.

In the plastic liner type FRP pressure vessel according to the present invention, the slit may be provided in at least one of the mirror portions. In addition, it is preferable that the slit has a width in which the amount (liquid level) of the content can be confirmed and a minimum area in which the gas barrier property can be ensured. Therefore, the width of the slit is preferably 5 mm or more, and the area of the slit is preferably 1/100 or less in terms of the surface area ratio of the entire liner.

In the plastic liner type FRP pressure vessel according to the present invention, the slit portion may be covered with a transparent or translucent resin foil having gas barrier properties. Gas barrier properties are further improved.

Further, in the plastic liner type FRP pressure vessel according to the present invention, a scale indicating the volume of the contents may be provided at the slit portion, whereby the volume of the contents can be grasped. The safety at the time is further improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a plastic liner type FRP pressure vessel according to a first embodiment of the present invention, wherein a is a perspective view showing each layer partially cut away, and b is an external view of the liner.
2 and 3 are external views of the liner of the container of the second embodiment, FIG. 4 is an external view of the liner of the container of the third embodiment, and FIG. 5 is an external view of the liner of the container of the fourth embodiment. is there.

As shown in FIG. 1, a plastic liner type FRP container A according to a first embodiment of the present invention is for a general household LPG, and has a container radius of 155 mm and a length of about 750.
mm, internal volume is about 50 liters. Liner 1
The blower was made of polypropylene and had a thickness of 3 mm, and the outer surface of the liner 1 was covered with an aluminum foil 2. At this time, a slit 3 having a width of 8 mm was formed in the aluminum foil 2 over the entire length of the liner 1 in the longitudinal direction (axial direction of the pressure vessel). The area of the slit was set to be 1/100 or less in terms of the surface area ratio of the entire liner. Further, the outer periphery of the liner 1 covered with the aluminum foil 2 is GFRP by the FW method.
Of helical layer 5 and hoop layer 4. The thickness of each layer is as follows: helical layer 5 = 0.62 mm, hoop layer 4 =
1.0 mm.

Next, in order to compare the plastic liner type FRP container A according to the present invention with the gas barrier property and the visual appearance of the amount of contents, a conventional type container B shown in FIG. Another conventional type container C shown in the drawing was prepared. The container B is the same size and material as the container A except that the container B is not coated with the metal foil 2. Further, the container C has the entire outer surface of the liner 1 covered with the metal foil 2 without providing the slit 3.

First, using the containers A, B, and C, water is poured into the containers A, B, and C in order to confirm the visibility of the contents.
A rise in the water level was observed from outside the container. In the case C, no rise in the water level could be confirmed, but in the cases A and B, the rise in the water level could be confirmed. Next, after water in each container was drained and dried, gas barrier properties were confirmed. First, container A,
B and C are filled with helium gas at a pressure of 5 kg / cm ² , sealed, and each container A, B, C is put into a separate sealed container.
The inside of each closed container was replaced with argon gas. Thereafter, the helium gas in the closed vessel was measured by gas chromatography every two hours after the elapse of 12 hours. As a result, in container B, helium gas was detected about 20 hours after filling, and gas leakage in container B was confirmed. However, for containers A and C, helium gas was not detected even 48 hours after filling. No leakage was confirmed, and it was found that the gas barrier property was excellent.

The plastic liner type FRP pressure vessel according to the second embodiment of the present invention shown in FIGS. 2 and 3 is the same as the first embodiment except for the container A and the position of the slit 3 provided in the metal foil 2. They have substantially the same configuration. As shown in FIG. 2, a metal foil 2 is provided to show the liner appearance.
Slits 3a and 3b are provided near the end of the upper mirror and near the end of the lower mirror, respectively. Since the inner capacity can be confirmed by the slit 3a near the upper mirror portion, there is an effect that overfilling at the time of gas filling can be prevented. At this time, the slit 3a for preventing overfilling needs to be provided at a position where the allowable amount can be confirmed in consideration of the thermal expansion of the contents. In addition, the provision of the slit 3b near the lower mirror portion has an effect that the remaining amount of the gas as the content can be easily confirmed, and is useful for determining the replacement time. In addition, the slit 3 may be provided in one of the vicinity of the both poles depending on the purpose. Slit 3b
When only the gas is provided, the gas barrier property is extremely excellent because the slit 3b and the gas as the content are in contact only for a short time during the gas exchange time.

FIG. 3 shows an example of the case where the container is used by laying it sideways. When the container is laid down in the same manner as described above, the upper and lower ends, or either one of the ends will be used. A slit 3 is provided in the vicinity. The area of the slit 3 is
A smaller amount is preferable because it is excellent in gas barrier properties.

Next, with respect to the plastic liner type FRP pressure vessel according to the third embodiment of the present invention shown in FIG. The container has substantially the same structure as that of the container of the second embodiment except that the container is covered with the foil 6. The resin foil 6 is made of polyvinylidene chloride, which is a transparent resin having gas barrier properties. Thereby, a container having particularly excellent gas barrier properties can be provided without impairing the visibility of the contents. The resin foil 6 may be a transparent or translucent resin having gas barrier properties, and polyvinyl alcohol or the like may be used.

Finally, the plastic liner type FRP pressure vessel according to the fourth embodiment shown in FIG. 5 is different from the vessel of the first embodiment in that the content (liquefied gas) is within the width of the slit 3 provided in the metal foil 2. It has substantially the same configuration except that a scale 7 indicating the capacity is provided. By providing the scale 7 indicating the volume of the content within the width of the slit 3 as described above, the accurate content can be grasped. From experience, if the filling amount of the content is set to 90% or less of the volume. Since it is known that the gas portion formed in the upper part of the container can sufficiently absorb the volume expansion due to the temperature difference, overfilling can be easily prevented by preventing the filling amount from exceeding the amount. Also, there is an effect that the gas remaining amount can be easily grasped at the time of use at home or the like.

[0020]

As described above, the plastic liner-type FRP pressure vessel of the present invention has the outside of the liner covered with metal foil and a part of which is provided with a slit. The surface can be easily seen through, the content can be grasped, and the gas barrier property is excellent. In addition, by covering the slit with a transparent or translucent resin foil having gas barrier properties, gas leakage can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a plastic liner type FRP pressure vessel according to a first embodiment of the present invention, where a is a perspective view showing each layer partially cut away, and b is an external view of a liner.

FIG. 2 is an external view of a liner of a plastic liner type FRP pressure vessel according to a second embodiment of the present invention.

FIG. 3 is an external view of a liner of another plastic liner type FRP pressure vessel according to a second embodiment of the present invention.

FIG. 4 is an external view of a liner of a plastic liner type FRP pressure vessel according to a third embodiment of the present invention.

FIG. 5 is an external view of a liner of a plastic liner type FRP pressure vessel according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a conventional plastic liner type FRP pressure vessel.

FIG. 7 is a sectional view of a conventional plastic liner type FRP pressure vessel.

[Explanation of symbols]

1: plastic liner 2: metal foil 3, 3a, 3b: slit 4: FRP hoop layer 5: FRP helical layer 6: resin foil 7: scale

Claims (5)

[Claims] 1. A plastic liner-type FRP pressure vessel in which the outer surface of a plastic liner is covered with a metal foil and the outside thereof is further reinforced with an FRP layer, wherein the plastic liner and the FRP layer are formed of a transparent or translucent material. Wherein the metal foil is provided with a slit along a length direction or a circumferential direction of the plastic liner.
P pressure vessel. 2. The plastic liner type FRP pressure vessel according to claim 1, wherein said plastic liner is formed of polyethylene or polypropylene, and said FRP layer is made of glass fiber reinforced plastic. 3. The plastic liner type FRP pressure vessel according to claim 1, wherein a slit provided in the metal foil is provided in at least one of both mirror portions of the plastic liner. 4. The plastic liner type FRP pressure vessel according to claim 1, wherein the slit provided in the metal foil is coated with a transparent or translucent resin having gas barrier properties. 5. The plastic liner type FRP pressure vessel according to claim 1, wherein a scale indicating the amount of contents is provided in a portion of the plastic liner corresponding to the slit.