JP2016166617A - High-pressure tank and manufacturing method of high-pressure tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a GFRP (Glass Fiber-Reinforced Plastic) layer in a high-pressure tank is weak in strength compared to a CFRP (Carbon Fiber-Reinforced Plastic) layer, and does not contribute to the improvement of the rigidity of the high-pressure tank, and the weight of the high-pressure tank is increased by the GFRP layer which hardly contributes to the improvement of the rigidity, however, when forming the GFRP layer differently from the CFRP layer, it takes a long time for the manufacturing of the high-pressure tank, and consequently, there has been required a high-pressure tank having no GFRP layer.SOLUTION: In a high-pressure tank having a liner being an inner shell, and a reinforcing layer which is formed by winding a fiber bundle on the liner, the reinforcing layer has a portion which has a prescribed thickness from an outer surface of the high-pressure tank and is constituted of the fiber bundle different from the other portion in color.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-pressure tank and a method for manufacturing a high-pressure tank.

  Conventionally, a high-pressure tank including a liner that is an inner shell and a reinforcing layer formed by winding a resin-impregnated fiber bundle in which a plurality of fibers are bundled around the liner is known (Patent Document 1). The high-pressure tank described in Patent Document 1 uses carbon fibers as a reinforcing layer. In order to protect the carbon fiber reinforcing layer (CFRP layer), a glass fiber protective layer (GFRP layer) is further provided on the CFRP layer. ). Here, the GFRP layer provided in the high-pressure tank is used for performance degradation judgment when the high-pressure tank receives an impact from the outside, and the degree of the damage received by the impact does not exceed the thickness of the GFRP layer ( If the lower CFRP layer is not exposed), it can be determined that the performance of the high-pressure tank is not affected.

Japanese Patent Laid-Open No. 8-35598

  The GFRP layer in the above-described high-pressure tank is weaker than the CFRP layer, and hardly contributes to the improvement of the strength of the high-pressure tank. There is a problem that the weight of the high-pressure tank increases due to the GFRP layer that hardly contributes to the improvement in strength. Further, when the GFRP layer is formed separately from the CFRP layer, there is a problem that it takes time to manufacture the high-pressure tank. Therefore, a high-pressure tank that does not include a GFRP layer has been desired.

  The present invention has been made to obtain a high-pressure tank that does not include a GFRP layer as described above, and can be realized as the following modes.

(1) The present invention is a high-pressure tank comprising: a liner that is an inner shell; and a reinforcing layer formed by winding a fiber bundle on the liner; the reinforcing layer is an outer surface of the high-pressure tank The portion having a predetermined thickness is composed of a fiber bundle having a color different from that of the other portions. With such a high-pressure tank, it is possible to judge performance deterioration when the high-pressure tank receives an impact from the outside without providing a separate GFRP layer on the CFRP layer. Therefore, since the GFRP layer can be eliminated, the weight of the high-pressure tank can be reduced. Further, the manufacturing time required for forming the GFRP layer can be reduced.

(2) According to another aspect of the present invention, there is provided a first reinforcing layer formed by winding a first fiber bundle on a liner as an inner shell; and the first reinforcing layer on the first reinforcing layer. A high-pressure tank manufacturing method comprising: a second reinforcing layer having a predetermined thickness formed by winding a second fiber bundle having a different color from that of the first fiber bundle; Between the first winding step of winding the first fiber on the liner; and the second winding step of winding the second fiber bundle on the first reinforcing layer; A switching step for switching between a bundle and the second fiber bundle is provided. With such a high-pressure tank manufacturing method, it is possible to obtain a high-pressure tank capable of determining performance deterioration when the high-pressure tank is subjected to an external impact without providing a separate GFRP layer on the CFRP layer. Therefore, the manufacturing time required for forming the GFRP layer can be reduced. Here, “switching between the first fiber bundle and the second fiber bundle” means that the first fiber bundle is colored in the course of conveyance to create a second fiber bundle and supply it to the liner, Supplying a fiber bundle in which the first fiber bundle and the second fiber bundle are connected in advance to the liner, and preparing a bobbin around which the first fiber bundle is wound and a bobbin around which the second fiber bundle is wound This means that all the fiber bundles of two different colors are switched and supplied to the liner, such as switching the bobbin supplying the fiber bundle at a predetermined timing and supplying the fiber bundle to the liner.

It is a figure of the section containing the central axis of the high-pressure tank which is one embodiment of the present invention. It is explanatory drawing of the filament winding apparatus which is one Embodiment of this invention. It is a top view which shows the structure of the guide mechanism which is one Embodiment of this invention. It is a perspective view which shows the structure of a part of guide mechanism which is one Embodiment of this invention.

  As shown in FIG. 1, the high-pressure tank 1 includes a liner 2 as an inner shell, a reinforcing layer 3 formed by winding a fiber bundle on the liner 2, and a base 6. The high-pressure tank 1 stores high-pressure (for example, about 70 MPa) hydrogen gas. The high-pressure tank 1 is long and has a base 6 at one end, and has a cylindrical shape with both ends on a curved surface.

  The liner 2 includes a straight portion having a cylindrical shape, and a first dome portion and a second dome portion formed on curved surfaces at both ends of the straight portion. The first dome has an opening into which the cap 6 is inserted. The liner 2 is made of a thermoplastic resin such as polyethylene, nylon, polypropylene, or polyester.

  The base 6 is fitted with the opening of the first dome portion, and a hole is formed around the axis. A valve for taking out the gas in the high-pressure tank 1 is inserted into the hole. The central axis of the base 6 and the central axis of the high-pressure tank 1 coincide. The base 6 is made of, for example, a metal such as aluminum or stainless steel.

  The reinforcing layer 3 is formed by winding the fiber bundle on the liner 2 and the base 6. The reinforcing layer 3 includes a first reinforcing layer 4 formed of a fiber bundle that is not colored, and a second reinforcing layer 5 formed of a fiber bundle that is colored. The fiber bundle is, for example, carbon. As the carbon fiber bundle 700, for example, about 24,000 yarns obtained by firing polyacrylonitrile raw yarns at about 3,000 ° C. are twisted and collected. A flat sheet having a thickness of about 200 μm and a width of about 4 mm to 5 mm can be exemplified. Further, the carbon fiber bundle 700 is impregnated with a resin such as a thermosetting epoxy. The carbon fiber bundle 700 impregnated with the resin is referred to as a resin-impregnated carbon fiber bundle 710. The resin-impregnated carbon fiber bundle 710 may be a prepreg in which a plurality of fibers are pre-impregnated with a thermosetting resin and semi-cured or dried. The uncolored fiber bundle in the present embodiment is a first fiber bundle, and the colored fiber bundle is a second fiber bundle.

  The second reinforcing layer 5 is formed by winding a colored resin-impregnated carbon fiber bundle 710 on the first reinforcing layer 4. The colored resin-impregnated carbon fiber bundle 710 is a resin-impregnated carbon fiber bundle 710 in the course of transporting the resin-impregnated carbon fiber bundle 710 to the liner 2 in the step of winding the resin-impregnated carbon fiber bundle 710 described later on the liner 2. It is created by applying a paint to the first reinforcing layer 4 and wound around the first reinforcing layer 4. The color of the paint may be any number, but when the fiber bundle is made of carbon, it is preferably red or the like that can be easily distinguished from carbon.

  The second reinforcing layer 5 has a predetermined thickness from the surface of the high-pressure tank 1. Here, the predetermined thickness is determined in advance to be equivalent to the allowable depth of damage from the surface of the high-pressure tank 1 when the high-pressure tank 1 receives an impact. If it is such thickness, when the 1st reinforcement layer 4 which is the lower layer of the 2nd reinforcement layer 5 is exposed in the part of a crack of a surface, or the coating material of the 2nd reinforcement layer 5 peels off When the carbon portion is exposed, it can be determined that the performance of the high-pressure tank 1 may be deteriorated. Furthermore, since the GFRP layer can be eliminated, the weight of the high-pressure tank 1 can be reduced. In the present embodiment, the predetermined thickness is determined to be equal to the thickness of the outermost layer of the reinforcing layer 3.

  FIG. 2 is an explanatory view showing the configuration of the filament winding apparatus 10 used in the process of manufacturing the high-pressure tank 1. The filament winding apparatus 10 includes a fiber unwinding mechanism 20, a resin impregnation mechanism 30, a guide mechanism 40, a liner rotating device 50, and a control unit 60.

  The fiber unwinding mechanism 20 is a mechanism for winding a fiber bundle, and includes a plurality of bobbins 201 to 204, a plurality of conveying rollers 211 to 214, and a bundling roller 220. The bobbins 201 to 204 are cylindrical members around which the yarn is wound, and the carbon fiber bundle 700 is wound around the bobbins 201 to 204. The conveyance rollers 211 to 214 are provided corresponding to the bobbins 201 to 204, and convey the carbon fiber bundle 700 unwound from the bobbins 201 to 204 to the bundling roller 220. The bundling roller 220 aligns the plurality of carbon fiber bundles 700 unwound from the bobbins 201 to 204 and conveys them to the resin impregnation mechanism 30.

  The resin impregnation mechanism 30 is a mechanism for impregnating the carbon fiber bundle 700 with an epoxy resin, and includes a plurality of transport rollers 301 to 305 and a resin impregnation tank 310. The conveyance rollers 301 to 305 convey the carbon fiber bundle 700 to the guide mechanism 40. The resin impregnation tank 310 contains a liquid thermosetting epoxy resin heated in the range of 40 ° C. to 50 ° C. and subjected to viscosity management. The carbon fiber bundle 700 is immersed in the thermosetting epoxy resin in the resin impregnation tank 310 by being conveyed under the conveyance roller 302.

  The guide mechanism 40 is a mechanism for aligning and guiding the resin-impregnated carbon fiber bundle 710 to the outer surface of the liner 2. The guide mechanism 40 includes a first guide roller 410, a second guide roller 420, and a third guide roller 430. The first guide roller 410, the second guide roller 420, and the third guide roller 430 Used to convey the resin-impregnated carbon fiber bundle 710 to the liner 2. The first guide roller 410, the second guide roller 420, and the third guide roller 430 are configured not to rotate by contact with the conveyed resin-impregnated carbon fiber bundle 710. The second guide roller 420 is made of a porous metal, and a paint for coloring the resin-impregnated carbon fiber bundle 710 can be ejected from the inside of the roller toward the surface. The guide mechanism 40 guides the resin-impregnated carbon fiber bundle 710 to the outer surface of the liner 2 while moving based on an operation programmed in advance by the control unit 60 described later.

  The liner rotating device 50 winds the resin-impregnated carbon fiber bundle 710 around the liner 2 while applying tension to the resin-impregnated carbon fiber bundle 710 by rotating the liner 2 to be wound. The liner 2 is supported so that the major axis is rotatable, and is rotated around the major axis by the liner rotating device 50. The end portion of the resin-impregnated carbon fiber bundle 710 guided from the guide mechanism 40 is fixed to a winding start portion (not shown) of the liner 2 and is wound around the outer periphery of the liner 2 by the rotation of the liner 2. When the shape of the product is formed, a curing process is performed thereafter, the epoxy resin is cured, and the high-pressure tank 1 reinforced with fiber is formed.

  The control unit 60 is a control device including a CPU and the like, and is electrically connected to the resin impregnation tank 310, the guide mechanism 40, and the liner rotation device 50. The controller 60 controls the resin impregnated carbon fiber bundle 710 to be guided on the liner 2 while moving the guide mechanism 40 based on a predetermined program. The control unit 60 controls the speed at which the liner rotating device 50 rotates the liner 2 based on a predetermined program. The control unit 60 controls the coating material supply device 450 described later to apply the coating material to the carbon fiber bundle 700 from a predetermined timing so that the second reinforcing layer 5 has a predetermined thickness. The controller 60 controls a heating means (not shown) disposed in the resin impregnation tank 310 to heat the liquid thermosetting epoxy resin in the range of 40 ° C. to 50 ° C.

  FIG. 3 is a top view showing the configuration of the guide mechanism 40. In the present embodiment, as shown in FIG. 3, a first guide roller 410, a second guide roller 420, and a third guide roller 430 are arranged in order from the upstream in the transport direction of the resin-impregnated carbon fiber bundle 710. The first guide roller 410 and the second guide roller 420 are drum type rollers in which the diameter of the central portion in the axial direction is larger than the diameter of the end portion. The third guide roller 430 is a drum type roller in which the diameter of the central portion in the axial direction is smaller than the diameter of the end portion. As shown in FIG. 3, the resin-impregnated carbon fiber bundle 710 enters from the first guide roller 410 side, the upper surface outer periphery of the first guide roller 410, the lower outer periphery of the second guide roller 420, and the third guide roller 430. Are respectively guided by the liner 2 in contact with the upper outer periphery thereof. The position of the center axis of the second guide roller 420 is higher than the positions of the center axis of the first guide roller 410 and the center axis of the third guide roller 430. The second guide roller 420 is made of, for example, a porous metal such as stainless steel, nickel, titanium, or a titanium alloy. A paint pipe 440 is connected to the second guide roller 420, and a paint supply device 450 that supplies the paint is connected to the paint pipe 440.

  FIG. 4 is a perspective view of the second guide roller 420 and the resin-impregnated carbon fiber bundle 710. The second guide roller 420 is made of a porous metal, and a paint pipe 440 is connected near the central axis of the roller. The paint pipe 440 is connected to the paint supply device 450. The paint supply device 450 receives a signal from the control unit 60 and supplies the paint to the second guide roller 420 through the paint pipe 440. Since the second guide roller 420 is made of a porous metal, the paint from the paint pipe 440 connected in the vicinity of the central axis can be ejected to the surface of the second guide roller 420 through the porous hole. .

  The control unit 60 transmits a signal to the coating material supply device 450 so as to supply the coating material to the second guide roller 420 from a predetermined timing so that the second reinforcing layer 5 has a predetermined thickness. Here, the predetermined thickness is determined in advance to be equivalent to the allowable depth of damage from the surface of the high-pressure tank 1 when the high-pressure tank 1 receives an impact. In the present embodiment, since the predetermined thickness is the thickness of the outermost layer, the control unit 60 transmits a signal to the paint supply device 450 when the outermost layer is wound. The coating material supply device 450 supplies the coating material to the second guide roller 420, and the second guide roller 420 applies the coating material to the resin-impregnated carbon fiber bundle 710 from the surface. The second guide roller 420 has a drum shape and widens the resin-impregnated carbon fiber bundle 710, so that the paint can be uniformly applied to the entire resin-impregnated carbon fiber bundle 710. Thereby, without providing a separate GFRP layer on the CFRP layer, when the high-pressure tank 1 receives an impact, it is possible to obtain a high-pressure tank 1 capable of determining that the performance of the high-pressure tank 1 may be deteriorated. Can do. Therefore, the manufacturing time required for forming the GFRP layer can be reduced.

<Modification 1>
In the said embodiment, although the thickness of the 2nd reinforcement layer 5 was made into the thickness of an outermost layer, the thickness of the 2nd reinforcement layer 5 is not restricted to this. Since the allowable depth of scratches varies depending on the strength of the reinforcing layer 3 and the like, the thickness of the second reinforcing layer may be increased as necessary.

<Modification 2>
In the above embodiment, the second guide roller 420 is made of a porous metal in order to apply the paint to the resin-impregnated carbon fiber bundle 710 in the second guide roller 420. However, the present invention is not limited to this. A slit may be provided in a part of the second guide roller 420, and the paint may be applied from the slit. Alternatively, a spray connected to the paint supply device 450 may be provided separately to apply the paint to the resin-impregnated carbon fiber bundle 710. Further, the place where the paint is applied to the resin-impregnated carbon fiber bundle 710 is not limited to the second guide roller 420, and may be any place in the middle of conveying the resin-impregnated carbon fiber bundle 710 to the liner 2.

<Modification 3>
In the said embodiment, although the 1st reinforcement layer was comprised with the fiber bundle which is not colored and the 2nd reinforcement layer was comprised with the colored fiber bundle, it is not restricted to this. The first reinforcing layer may be a colored fiber bundle, and the second reinforcing layer may be an uncolored fiber bundle.

<Modification 4>
In the above-described embodiment, the non-colored fiber bundle that is the first fiber bundle and the colored fiber bundle that is the second fiber bundle are switched by applying the paint. However, the present invention is not limited to this. The fiber bundle may be switched by preparing a fiber bundle in which the first fiber bundle and the second fiber bundle are connected in advance and winding the fiber bundle on the liner 2. At this time, the length of the second fiber bundle may be determined according to the shape of the liner 2 and the thickness of the second reinforcing layer. In addition, the bobbin around which the first fiber bundle is wound and the bobbin around which the second fiber bundle is wound are prepared in advance, and the fiber bundle is changed by changing the bobbin that supplies the fiber bundle at a predetermined timing. You may switch.

  The present invention is not limited to the above-described embodiment, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments or the modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 1 ... High pressure tank 2 ... Liner 3 ... Reinforcement layer 4 ... 1st reinforcement layer 5 ... 2nd reinforcement layer 6 ... Base 10 ... Filament winding apparatus 20 ... Fiber unwinding mechanism 30 ... Resin impregnation mechanism 40 ... Guide mechanism 50 ... Liner rotating device 60 ... Control unit 201, 202, 203, 204 ... Bobbins 211, 212, 213, 214 ... Conveying roller 220 ... Bundling roller 301, 302 ... Conveying roller 310 ... Resin impregnation tank 410 ... First guide roller 420 ... First 2 guide rollers 430... 3rd guide roller 440. Paint pipe 450. Paint supply device 700.

Claims (2)

In a high-pressure tank comprising a liner which is an inner shell, and a reinforcing layer formed by winding a fiber bundle on the liner,
The high-pressure tank is characterized in that the reinforcing layer is composed of a fiber bundle having a predetermined thickness from the outer surface of the high-pressure tank and having a color different from that of the other portions. A first reinforcing layer formed by winding a first fiber bundle on a liner which is an inner shell, and a second color different from the first fiber bundle on the first reinforcing layer. In a manufacturing method of a high-pressure tank comprising: a second reinforcing layer having a predetermined thickness formed by winding a fiber bundle of
A first winding step of winding the first fiber bundle on the liner;
Between the second winding step of winding the second fiber bundle on the first reinforcing layer,
A method for manufacturing a high-pressure tank, comprising a switching step of switching between the first fiber bundle and the second fiber bundle.