JP2010090938A - Tank and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure sufficient strength of a tank such as a high-pressure gas tank. <P>SOLUTION: This high-pressure gas tank 2 has a cylindrical barrel part 2a with an equal diameter and dome parts 2b connected to both ends of the barrel part 2a and formed to be shrunken in diameter as it separates from the barrel part 2a. The surface of a resin liner 20 is formed with a FRP layer 21 by hoop winding and helical winding using a method of winding a filament. The surface of the FRP layer 21 is formed with a protective layer 22. The protective layer 22 is formed from a region R on a barrel part 2a side of the dome part 2b including the thinnest part K of the FRP layer 21 to the barrel part 2a. The protective part 22 is formed by helical winding, wherein a folding part is positioned in the region R on the barrel 2a side of the dome part 2b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tank and a method for manufacturing the tank.

  For example, in a fuel cell system mounted on an automobile or the like, a high-pressure gas tank is used as a fuel gas supply source. In general, a high-pressure gas tank has a substantially ellipsoidal shape, and includes a cylindrical barrel portion having the same diameter, and a dome portion that is connected to both ends of the barrel portion and decreases in diameter as the distance from the barrel portion increases. A base is formed at the tips of the dome portions on both sides.

  Further, the high pressure gas tank has a reinforcing layer formed on the surface of the liner in order to increase the strength against internal pressure and the like. This reinforcing layer is formed by winding reinforcing fibers around the entire surface of the liner excluding the die using a filament wiping (FW) method. In general, the reinforcing layer is formed by winding reinforcing fibers around the trunk by hoop winding, and then winding the reinforcing fibers around the dome and trunk by helical winding. Hoop winding is a winding method in which reinforcing fibers are wound in the circumferential direction of the tank around the tank axis, and helical winding is a winding in which reinforcing fibers are folded around the bases of the dome portions on both sides and wound obliquely with respect to the tank axis. Is.

JP 11-101397 A JP 2002-122297 A

  However, when the reinforcing layer is formed by the above-described method, the reinforcing fiber is folded around the base in the vicinity of the base during helical winding, so that the thickness of the dome can vary. That is, the thickness in the vicinity of the base of the dome portion is increased, and the thickness of the region on the trunk portion side of the dome portion is decreased. In this case, there is a concern that the thin portion is weaker than, for example, an external impact compared to the thick portion.

  This invention is made | formed in view of this point, and it aims at ensuring sufficient intensity | strength of tanks, such as a high pressure gas tank.

  To achieve the above object, the present invention provides a tank having a cylindrical body portion having the same diameter and a dome portion connected to both ends of the body portion and having a diameter reduced as the distance from the body portion increases. A reinforcing layer is formed on the surface by hoop winding and helical winding by a filament wiping method, a protective layer is formed on the surface of the reinforcing layer, and the protective layer includes the thinnest part of the reinforcing layer. The dome portion is formed from the region on the body portion side to the body portion.

  According to the present invention, since the protective layer is formed in the region on the trunk portion side of the dome portion including the thinnest portion of the reinforcing layer, the thin portion of the dome portion is reinforced, and the tank as a whole with respect to external impact or the like High strength can be secured. In addition, since a portion where the protective layer is not formed is formed on the center side of the thick dome portion (the side opposite to the trunk portion side), the weight of the tank can be reduced as compared with the case where the protective layer is formed as a whole.

  The protective layer may be formed by helical winding in which a folded portion is located in the region on the trunk portion side of the dome portion. In such a case, the protective layer can be appropriately formed at a predetermined position.

  The protective layer may be formed by helical winding at a higher angle with respect to the tank axis than the helical winding at the time of forming the reinforcing layer. In this case, the position of the helically folded portion can be appropriately adjusted to the region on the trunk portion side of the dome portion.

  The protective layer may be formed of a material having higher impact resistance than the reinforcing layer. Thereby, the intensity | strength with respect to the external impact of a protective layer is securable.

  The reinforcing layer may be formed of a carbon fiber reinforced resin, and the protective layer may be formed of a glass fiber resin or an aramid fiber resin.

  The present invention according to another aspect is a method for manufacturing a tank having a body portion having the same diameter and a dome portion connected to both ends of the body portion and having a diameter reduced as the distance from the body portion increases. A step of forming a reinforcing layer on the surface of the liner by hoop winding and helical winding, and a reinforcing layer by helical winding in which a folded portion is located in a region on the trunk portion side of the dome portion including the thinnest portion of the reinforcing layer Forming a protective layer on the surface of the substrate.

  According to the present invention, a tank excellent in impact resistance can be realized.

  In the fuel cell vehicle 1, for example, three high-pressure gas tanks 2 are mounted on the rear portion of the vehicle body. The high-pressure gas tank 2 constitutes a part of the fuel cell system 3, and fuel gas can be supplied from each high-pressure gas tank 2 to the fuel cell 5 through the gas supply line 4. The fuel gas stored in the high-pressure gas tank 2 is a combustible high-pressure gas, for example, hydrogen gas. The high-pressure gas tank 2 is applicable not only to the fuel cell vehicle 1 but also to vehicles such as electric vehicles and hybrid vehicles, as well as various moving bodies (for example, ships, airplanes, robots, etc.) and stationary equipment (housing, buildings). it can.

  FIG. 2 is a longitudinal sectional view showing an outline of the configuration of the high-pressure gas tank 2. The high-pressure gas tank 2 is formed, for example, in a substantially elliptical shape, and has a cylindrical body portion 2a having the same diameter, and a substantially hemispherical dome that is connected to both ends of the body portion 2a and decreases in diameter as the distance from the body portion 2a increases. It has a part 2b. A base 10 is provided at the center of both dome portions 2 b, that is, at both ends of the high-pressure gas tank 2.

  The high-pressure gas tank 2 has a substantially elliptical resin liner 20 inside. The resin liner 20 is formed of, for example, a polyamide resin such as nylon 6 or nylon 6, 6, and a polyethylene resin. In the present embodiment, the liner of the high-pressure gas tank 2 is made of resin, but may be made of aluminum. An FRP (Fiber Reinforced Plastics) layer 21 as a reinforcing layer is formed on almost the entire outer peripheral surface of the resin liner 20 (a portion excluding the base 10). The FRP layer 21 is formed by winding resin fibers around the outer peripheral surface of the resin liner 20 using hoop winding and helical winding by the FW method. As the resin of the FRP layer 21, for example, an epoxy resin, a modified epoxy resin, an unsaturated polyester resin, or the like is used. Moreover, as a fiber, carbon fiber is used, for example. Thereby, the FRP layer 21 is formed of carbon fiber reinforced resin.

  A protective layer 22 is formed on the outer peripheral surface of the FRP layer 21. The protective layer 22 is a region excluding a portion on the base 10 side of the dome portion 2b where the FRP layer 21 is thick, that is, a region R on the trunk portion 2a side of the dome portion 2b including the thinnest portion of the FRP layer 21. It is formed over. The protective layer 22 is formed by helical winding by the FW method in which a later-described folded portion P is positioned in a region R on the body portion 2a side of the dome portion 2b. The protective layer 22 is made of, for example, a glass fiber resin or an aramid fiber resin that has higher impact resistance than the carbon fiber reinforced resin.

  Next, the manufacturing method of the high pressure gas tank 2 comprised as mentioned above is demonstrated.

  First, the FRP layer 21 is formed on the outer peripheral surface of the resin liner 20. The FRP layer 21 is formed by the FW method. For example, as shown in FIG. 3, the FW method is performed by rotating the resin liner 20 by the rotating shaft 51 in the fiber winding device 50 and winding the resin fiber F sent from the fiber guide portion 52 around the resin liner 20. .

  In the formation process of the FRP layer 21, the resin fiber F is first wound around the trunk portion 2a by hoop winding. In this hoop winding, for example, the fiber guide portion 52 is directly opposed to the barrel portion 2a of the rotating resin liner 20, and the fiber guide portion 52 is supplied to the barrel portion 2a while the fiber guide portion 52 is supplied to the barrel portion 2a. This is performed by moving the liner 20 in the direction of the rotation axis at a low speed. Thus, as shown in FIG. 4, the resin fiber F is wound around the entire body portion 2a.

  Thereafter, as shown in FIG. 5A, the resin fiber F is wound around the dome portion 2b by helical winding. This helical winding is performed, for example, by reciprocating the fiber guide portion 52 between the both dome portions 2b while supplying the resin fiber F from the fiber guide portion 52 to the rotating resin liner 20. At this time, the resin fibers F are wound obliquely with respect to the tank shaft from one dome portion 2b to the other dome portion 2b, and in the vicinity of the cap 10 of each dome portion 2b as shown in FIG. 5 (b). It is folded around the base 10. That is, the helically folded portion P is located near the base 10 of the dome portion 2b. Thus, the FRP layer 21 is formed on almost the entire outer peripheral surface of the resin liner 20. By this helical winding, the FRP layer 21 in the vicinity of the base 10 of the dome portion 2b becomes thicker than the FRP layer 21 on the body portion 2a side of the dome portion 2b, and the FRP layer 21 is formed on the body portion 2a side of the dome portion 2b. The thinnest part K (shown in FIG. 2) is formed.

  Next, the protective layer 22 is formed on the outer peripheral surface of the FRP layer 21. As shown in FIG. 6A, the protective layer 22 is formed by helical winding by the FW method. At this time, as shown in FIG. 6B, the position of the helically folded portion P is adjusted to the region R on the trunk portion 2 a side of the dome portion 2 b including at least the thinnest portion K of the FRP layer 21. The helical winding at this time is performed at a higher angle (θ in FIG. 6A) with respect to the tank axis than the helical winding at the time of forming the FRP layer 21. Thus, the protective layer 22 is formed from the region R of the dome portion 2b on the body portion 2a side to the body portion 2a.

  According to the above embodiment, since the protective layer 22 is formed by the helical winding in which the folded portion P is positioned in the region R on the trunk portion 2a side of the dome portion 2b including the thinnest portion K of the FRP layer 21, the dome is formed. The thin portion of the portion 2b is reinforced, and sufficient strength of the entire tank against external impact or the like can be secured. Further, since the protective layer 22 is not formed near the base 10 of the thick dome portion 2b, the weight of the high-pressure gas tank 2 can be reduced as compared with the case where the protective layer is formed as a whole. In addition, a method of attaching a protector to the dome portion 2b in order to reinforce the strength against external impact can be considered, but according to the present embodiment, the high-pressure gas tank 2 can be reduced in weight as compared with that case.

  Since the protective layer 22 is formed of a material having higher impact resistance than the FRP layer 21, sufficient strength of the protective layer 22 against external impact can be secured.

  Since the FRP layer 21 is formed of carbon fiber reinforced resin and the protective layer 22 is formed of glass fiber resin or aramid fiber resin, the inner side ensures the strength against the internal pressure and the strength against the external impact appropriately. It can be secured.

  Since the protective layer 22 is formed by helical winding at a higher angle with respect to the tank axis than the helical winding at the time of forming the FRP layer 21, the position of the folded portion P of the helical winding is set on the body 2a side of the dome portion 2b. The region R can be adjusted appropriately.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be made within the scope of the ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

It is a schematic diagram of the fuel cell vehicle carrying a high pressure gas tank. It is a longitudinal cross-sectional view which shows the outline of a structure of a high pressure gas tank. It is a schematic diagram which shows the outline of a structure of a fiber winding apparatus. It is explanatory drawing which shows the resin liner by which the resin fiber was wound around the trunk | drum. (A) is explanatory drawing of the tank which shows a mode that the resin fiber is wound around the dome part of a resin liner by helical winding, (b) is a side view of the tank in that case. (A) is explanatory drawing of the tank which shows a mode that the resin fiber is wound around the outer peripheral surface of a FRP layer by helical winding, (b) is a side view of the tank in that case.

Explanation of symbols

2 High-pressure gas tank 2a Body 2b Dome part 10 Base 20 Resin liner 21 FRP layer 22 Protective layer R Area on the body side of the dome part K Thinnest part

Claims (6)

A tank having a cylindrical barrel portion having the same diameter and a dome portion connected to both ends of the barrel portion and having a diameter reduced as the distance from the barrel portion increases.
On the surface of the liner, a reinforcing layer is formed by hoop winding and helical winding by the filament wiping method,
A protective layer is formed on the surface of the reinforcing layer,
The said protective layer is formed from the area | region of the said trunk | drum side of the said dome part including the thinnest part of the said reinforcement layer to the said trunk | drum, The tank characterized by the above-mentioned.   2. The tank according to claim 1, wherein the protective layer is formed by helical winding in which a folded portion is located in the region on the body portion side of the dome portion.   The tank according to claim 2, wherein the protective layer is formed by helical winding at a higher angle with respect to the tank axis than the helical winding at the time of forming the reinforcing layer.   The tank according to claim 1, wherein the protective layer is made of a material having higher impact resistance than the reinforcing layer.   The tank according to claim 4, wherein the reinforcing layer is formed of a carbon fiber reinforced resin, and the protective layer is formed of a glass fiber resin or an aramid fiber resin. A tank manufacturing method having a body portion having the same diameter and a dome portion connected to both ends of the body portion and having a diameter reduced as the distance from the body portion increases.
Forming a reinforcing layer on the surface of the liner by hoop winding and helical winding by a filament wiping method;
Forming a protective layer on the surface of the reinforcing layer by helical winding in which a folded portion is located in a region on the trunk portion side of the dome portion including the thinnest portion of the reinforcing layer, Tank manufacturing method.