JP2019015295A - High pressure tank - Google Patents

Abstract

To make a more appropriate determination that damage may be given to the inside of a reinforcing layer when impact is applied to a high pressure tank protected by a protector.SOLUTION: A high pressure tank 10 includes a liner 50 for sealing fluid, a reinforcing layer 52 covering the outer surface of the liner, and a protector 20 arranged so as to face at least part of the surface of the reinforcing layer. The protector has a plurality of protruded parts 32 protruded on the face facing the reinforcing layer toward the reinforcing layer. The reinforcing layer includes an inner layer 54 which is provided laminated on the liner and formed of fiber reinforcing plastic, and an outer layer 56 which covers the inner layer and to which, when impact is applied from the outside of the protector, damage is given by the protruded part to produce a trace according to the magnitude of the impact.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-pressure tank.

  As a tank for storing and sealing a high-pressure fluid, a tank including a liner that forms a space for storing a fluid, and a reinforcing layer that is provided so as to cover the liner and is configured by fiber reinforced plastic (FRP). It has been known. Moreover, the structure which arrange | positions a protector further on the said reinforcement layer in such a tank is known (for example, refer patent document 1). By disposing the protector on the reinforcing layer, the tank can be protected from external force.

JP 2013-167285 A

  However, even when a protector is provided, if the impact applied from the outside of the protector is large, damage may occur inside the reinforcing layer. Specifically, damage such as delamination or fiber breakage may occur inside the reinforcing layer constituted by FRP. When the damage of such a reinforcing layer is increased, the tank strength against the tank internal pressure is lowered, resulting in a problem that the durability of the tank is lowered. However, even if damage occurs inside the reinforcing layer in this way, the damage on the surface of the reinforcing layer protected by the protector is relatively small, so it is difficult to determine the damaged state of the tank from the appearance of the tank. . Therefore, when protecting a tank with a protector, the technique of determining more appropriately the possibility of the damage which generate | occur | produced in the tank was desired.

  The present invention has been made to solve the above-described problems, and can be realized as the following forms.

According to one aspect of the invention, a high pressure tank is provided. The high-pressure tank includes: a liner in which an internal space for sealing fluid is formed; a reinforcing layer that covers an outer surface of the liner; a protector that is disposed to face at least a part of the surface of the reinforcing layer; The protector includes a plurality of convex portions projecting toward the reinforcing layer on a surface facing the reinforcing layer; the reinforcing layer is provided by being laminated on the liner, and is made of fiber reinforced plastic. An inner layer configured to cover the inner layer, and when the impact is applied from the outside of the protector, the outer layer generates a trace corresponding to the impact by being damaged by the convex portion. .
According to this type of high-pressure tank, when the high-pressure tank is protected by a protector, the possibility of damage occurring in the tank can be determined more appropriately.

  The present invention can be implemented in various forms other than the above. For example, it can be realized in the form of a high-pressure gas tank manufacturing method, a high-pressure gas tank arrangement method, and a moving body equipped with the high-pressure gas tank.

It is a perspective view showing the outline of the appearance of a high-pressure tank. It is a cross-sectional schematic diagram of a high-pressure tank. It is explanatory drawing showing a mode that the marking board was seen from the Y-axis direction. It is a perspective view which shows an example of the external shape of a convex part. It is a perspective view which shows an example of the external shape of a convex part. It is a cross-sectional schematic diagram of a high-pressure tank. It is a cross-sectional schematic diagram of a high-pressure tank.

A. First embodiment:
(A-1) Overall configuration of the high-pressure tank:
FIG. 1 is a perspective view showing an outline of the appearance of a high-pressure tank 10 according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a cross-sectional state of the high-pressure tank 10.

  In this embodiment, the high-pressure tank 10 stores compressed hydrogen as a fluid and is mounted on a fuel cell vehicle. The high-pressure tank 10 includes a tank body 11, a tank fixing member 14, and a protector 20 (see FIG. 1).

  As shown in FIG. 1, the tank body 11 is formed in a substantially cylindrical shape, and FIG. 2 shows a state of a cross section perpendicular to the axial direction of the tank body 11. 1, 2, and FIGS. 3, 6, and 7, which will be described later, a horizontal direction parallel to the axial direction of the tank body 11 is represented as an X-axis direction, and a direction perpendicular to the axial direction is Y. Expressed as the axial direction. The vertical direction is represented as the Z-axis direction. The tank body 11 includes a liner 50 and a reinforcing layer 52 as shown in FIG. 2 and a valve 12 as shown in FIG.

  The liner 50 forms a space for sealing a fluid therein. The liner 50 can be formed of, for example, a synthetic resin such as a nylon resin (polyamide resin) or a polyethylene resin, or a metal such as an aluminum alloy. In this embodiment, the liner 50 is formed of nylon. Further, the liner 50 has a shape extending in the axial direction, and is provided on both sides of a cylindrical portion with a portion that decreases in diameter as it approaches the end. A base (not shown) is provided at one end, and a valve 12 is attached to the base.

  The reinforcing layer 52 is formed so as to cover the outer surface of the liner 50 and reinforces the liner 50 to improve the strength of the high-pressure tank 10 (strength against the internal pressure of the tank). The reinforcing layer 52 is provided so as to cover the entire outer surface of the liner 50, and the inner layer 54 on the liner 50 side and the outer layer 56 provided on the outer side of the inner layer 54 are laminated.

The inner layer 54 is a layer for securing the strength against the internal pressure of the tank body 11 filled with fluid, and is a layer formed of fiber reinforced plastic (FRP). Specifically, it is a layer obtained by winding a long fiber impregnated with a resin on the surface of the liner 50 and then curing the resin.

  The outer layer 56 protects the inner layer 54 and, as will be described later, when an impact is applied from the outside of the high-pressure tank 10, the outer layer 56 recognizes the degree of the applied impact by being scarred due to the impact. It is a layer to make it possible. In the present embodiment, the outer layer 56 is also formed of FRP in the same manner as the inner layer 54.

  Examples of the fibers used for the FRP layer include inorganic fibers such as metal fibers, glass fibers, carbon fibers, and alumina fibers, synthetic organic fibers such as aramid fibers, and various natural organic fibers such as cotton. These fibers may be used alone or in combination of two or more. In the present embodiment, the types of fibers included in the FRP constituting each of the inner layer 54 and the outer layer 56 are different. The type of FRP that constitutes each of the inner layer 54 and the outer layer 56 may be appropriately selected from the viewpoint of fulfilling the functions described above of the respective layers.

In the present embodiment, the inner layer 54 is formed of carbon fiber reinforced plastic (CFRP) including carbon fibers as fibers. Thereby, it is easy to secure sufficient strength against the tank internal pressure while forming the inner layer 54 thinner. In the present embodiment, the outer layer 56 is formed of glass fiber reinforced plastic (GFRP) including glass fibers as fibers. By configuring the outer layer 56 with GFRP that is softer than CFRP, as will be described later, it becomes easy to attach a scar due to an impact applied from the outside of the tank to the outer layer 56.

  As the resin contained in the FRP that constitutes each of the inner layer 54 and the outer layer 56, a thermosetting resin can be used. As the thermosetting resin, for example, an epoxy resin, a polyester resin, a polyamide resin, or the like can be used. it can. In the present embodiment, epoxy resin is used for both the inner layer 54 and the outer layer 56, but the resin used for the inner layer 54 and the outer layer 56 may be different.

  The inner layer 54 and the outer layer 56 made of FRP are formed by a filament winding method (FW method). The filament winding method is a method in which a fiber impregnated with a thermosetting resin is wound around a mandrel (in this embodiment, a liner 50) and the thermosetting resin is thermoset. The resin can be cured by, for example, heating using a heating furnace or an induction heating method using an induction heating coil that induces high frequency induction heating.

  The valve 12 is a member formed of metal (aluminum in the present embodiment), and is attached to the opening of the base described above to open and close the opening. Specifically, the valve 12 is a member for connecting a flow path for supplying hydrogen to the liner 50, a flow path for guiding hydrogen taken out from the liner 50, and the liner 50. It is. The valve 12 includes an in-valve channel for communicating these channels with the inside of the liner 50, and various valves for adjusting a communication state in the in-valve channel.

  The tank fixing member 14 is a member for fixing the tank body 11 to the vehicle body of the fuel cell vehicle. As shown in FIG. 1, in this embodiment, the tank fixing member 14 is formed in a belt shape, is curved along the outer periphery of the tank body 11, and is fastened to a mounting bracket 16 fixed at both ends to the vehicle body. Has been. The tank fixing member 14 only needs to have sufficient strength for fixing the tank main body 11, and can be made of metal, for example. In this embodiment, two tank fixing members 14 are used, but one or three or more tank fixing members 14 may be used. The tank fixing member 14 may have a shape other than the belt shape.

  The protector 20 is a member for protecting the tank body 11. As shown in FIG. 1, in this embodiment, the protector 20 is configured by a thin plate-like member, and is disposed to face at least a part of the surface of the reinforcing layer 52 of the tank body 11. The protector 20 is curved so as to follow the surface shape of the tank body 11 in the region covering the surface of the reinforcing layer 52. In the present embodiment, the protector 20 is attached to the tank fixing member 14. Specifically, the tank fixing member 14 is provided with a plurality of bolts 15 so as to protrude outward in the radial direction of the tank body 11. The protector 20 is provided with a plurality of fastening holes at positions corresponding to the plurality of bolts 15, and these fastening holes are fitted into the corresponding bolts 15 and fastened with nuts. The protector 20 may be fixed to the tank body 11 by a method other than fastening to the tank fixing member 14. In the present embodiment, the protector 20 is made of metal. Specifically, the protector 20 can be formed with metals, such as steel, stainless steel, aluminum, for example. The protector 20 may be made of a material other than metal as long as a desired strength can be ensured.

  The location where the protector 20 is disposed (the range in which the surface of the reinforcing layer 52 is covered by the protector 20) may be appropriately determined according to the location where the high-pressure tank 10 is disposed in the fuel cell vehicle, for example. For example, when the high-pressure tank 10 is disposed at the rear of the vehicle, the protector may be disposed so as to cover a region of the reinforcing layer 52 facing the rear end of the vehicle. Thereby, the high-pressure tank 10 can be protected from an impact applied from the rear of the vehicle. Further, the protector 20 is not provided so as to face a part of the surface of the reinforcing layer 52 (the surface of the tank body 11), but opposed to the entire surface of the tank body 11, that is, the entire surface of the tank body 11 is covered. You may arrange | position so that it may cover. In addition, the protector 20 may increase the strength by thickening a portion covering an area of the tank main body 11 that is considered to be relatively low in strength.

  As shown in FIG. 2, the protector 20 includes a substrate unit 25 and a marking plate 30 laminated on the tank body 11 side on the substrate unit 25. The marking plate 30 includes a plurality of convex portions 32 that protrude toward the reinforcing layer 52 on the surface facing the reinforcing layer 52. When the board part 25 and the marking plate 30 are made of metal, both can be integrated by welding, for example.

(A-2) Configuration of marking plate:
FIG. 3 is an explanatory diagram illustrating a state in which the marking plate 30 provided in the protector 20 disposed on the tank body 11 is viewed from the Y-axis direction. Since the marking plate 30 is integrated with the substrate portion 25 and disposed on the back side (the side facing the tank body 11) of the protector 20, the marking plate 30 is provided on the marking plate 30 and the marking plate 30 in FIG. The plurality of convex portions 32 are indicated by broken lines.

  As shown in FIGS. 1 and 3, the marking plate 30 of the present embodiment is divided at a position overlapping the tank fixing member 14 and divided into three parts. Each marking plate 30 includes a plurality of protrusions 32 protruding toward the reinforcing layer 52 as described above. In the present embodiment, the plurality of convex portions 32 are provided such that the interval between the adjacent convex portions 32 has a specific length in each of the X-axis direction and the Z-axis direction, and is regularly arranged. Yes. By arranging the plurality of protrusions 32 regularly, a more accurate determination can be made when determining the degree of impact applied to the tank body 11 by the scar formed by the protrusions 32 on the outer layer 56 as described later. It becomes possible. However, the arrangement of the plurality of convex portions 32 may be irregular.

  As will be described later, when the impact is applied to the high-pressure tank 10 from the outside of the protector 20, the convex portion 32 collides with the outer layer 56 and damages the outer layer 56, and the outer layer 56 depends on the magnitude of the impact. This is a structure for causing scarring. The shape of the convex part 32 should just be able to produce the scar in the outer layer 56 as mentioned above, A various shape is employable and it is not specifically limited. However, from the viewpoint of facilitating the generation of scarring by being pierced (biting into) the outer layer 56 when subjected to an impact, the convex portion 32 has a pointed tip protruding toward the tank body 11, or It is desirable that the tip has an open end shape.

  4 and 5 are perspective views showing an example of the external shape of the convex portion 32, respectively. The convex part 32 of FIG. 4 is formed by providing a cross-shaped notch in the marking plate 30 and bending (cutting up) the four triangular shapes formed by the notch. In this case, the tip of the convex portion 32 is the apex of each of the four triangular shapes. If the convex portion 32 having such a shape is provided, it is possible to form a scar having excellent visibility in the outer layer 56. The convex portion 32 in FIG. 5 is provided by forming a circular hole in the marking plate 30 at a position where the convex portion 32 is to be formed by punching, and then forming a substantially cylindrical convex portion by burring. ing. In this case, the tip of the convex portion 32 is a substantially circular open end. From the viewpoint of making it possible to determine the magnitude of the impact applied to each region of the tank body 11 from the state (depth) of the scar when an impact is applied to the high-pressure tank 10, The shape is desirably the same throughout the marking plate 30.

  The protector 20 of this embodiment is provided with the board | substrate part 25 for ensuring the rigidity as the protector 20, and the marking board 30 which has the convex part 32 as another member. Therefore, in order to ensure sufficient rigidity in the protector 20, even if it is necessary to increase the thickness of the protector 20 as a whole, by using the thinner marking plate 30, the convex portion 32 having a desired shape can be formed. It becomes possible to form it easily as a whole.

  In the protector 20, the substrate portion 25 and the marking plate 30 for providing the plurality of convex portions 32 do not need to be separate members, and the plurality of convex portions 32 may be formed in the protector 20. For example, the convex portion 32 may be formed directly on the substrate portion 25 without using the marking plate 30 separately. In this case, for example, a plurality of members having a pointed tip (for example, a conical shape) may be prepared, and these members may be embedded in the surface of the substrate portion 25. However, from the viewpoint of improving production efficiency, it is desirable to form the plurality of convex portions 32 in a lump by processing the marking plate 30 which is a separate member from the substrate portion 25.

(A-3) Operation at the time of collision Hereinafter, an operation when an impact is applied to the high-pressure tank 10 at the time of a vehicle collision and a scar is formed on the outer layer 56 by the convex portion 32 of the marking plate 30 will be described. To do.

  FIG. 6 is a schematic cross-sectional view showing a state of the high-pressure tank 10 when an impact is applied to the high-pressure tank 10, and shows a state of a cross-section perpendicular to the axial direction of the high-pressure tank 10 as in FIG. FIG. 2 shows a state before an impact is applied to the high-pressure tank 10, and FIG. 6 shows a state after the impact is applied.

  At the time of a vehicle collision or the like, the vehicle body is deformed, so that, for example, another member disposed around the high-pressure tank 10 collides with the high-pressure tank 10 as an interference object 60. In FIG. 2, the state in which the interference 60 moves toward the high-pressure tank 10 is represented by a white arrow. When the interference object 60 collides with the high-pressure tank 10, the protector 20 is deformed by the impact, and the impact is transmitted to the tank body 11 through the protector 20. At this time, the convex part 32 formed inside the protector 20 is stuck in the outer layer 56 by deformation | transformation of the protector 20 (refer FIG. 6).

  The strength of the impact applied to the tank body 11 via the protector 20 is strongest at the location where the interference object 60 collides, and gradually decreases from the location where the interference material 60 collides toward the periphery. Although the impact strength gradually changes around the location where the interference 60 collides, in FIG. 3, the portion of the surface of the tank body 11 covered with the marking plate 30 is changed to the impact strength. Accordingly, it is divided into three stages for convenience. Specifically, a region including the portion where the interference object 60 collides and having the strongest impact is indicated as a region A, a region outside the region A and having a weaker impact than the region A is indicated as a region B, and A region which is outside and has the weakest impact is shown as region C. And in each area | region and the convex part 32 formed in each area | region, the strong hatching is attached | subjected, so that the received impact force is strong. When the interference object 60 collides with the high-pressure tank 10, the convex portion 32 is deeply pierced by the tank body 11 in a region where the impact is large, and a deeper scar is formed in the outer layer 56.

  In the present embodiment, the protector 20 (convex portion 32) is formed of metal, the outer layer 56 of the tank body 11 is formed of GFRP, and the inner layer 54 is formed of CFRP. In the outer layer 56 made of GFRP, when the convex part 32 collides, the convex part 32 is pierced to form a scar. 4 and 5, the height of the convex portion 32 protruding from the surface of the marking plate 30 is indicated as a height h. In the present embodiment, the height h of the convex portion 32 and the thickness of the outer layer 56 are substantially the same. Therefore, when a certain degree of impact is applied to the tank body 11 via the protector 20, a scar in which the tip of the convex portion 32 reaches the inner layer 54 is formed in the outer layer 56. It should be noted that the harder CFRP inner layer 54 is hardly damaged even when the convex portion 32 collides.

  After an impact is applied to the high-pressure tank 10 such as when there is a vehicle collision, the protector 20 is removed from the tank body 11 and the scar formed on the outer layer 56 is examined to apply the impact to the tank body 11. The degree of impact can be determined. In the present embodiment, when the impact that the convex portion 32 bites into the outer layer 56 over the entire height is applied, the inner layer can be recognized even if no significant damage other than the scar due to the convex portion 32 is observed on the appearance of the tank body 11. It is determined that there is a relatively high possibility that damage such as delamination or fiber breakage has occurred inside 54. Specifically, since the CFRP layer that is the inner layer 54 is black including carbon, for example, if a black scar is recognized on the external appearance of the tank main body 11, a scratch due to the convex portion 32 reaches the inner layer 54. I understand that. Therefore, when a black scar is confirmed on the surface of the outer layer 56, it is determined that the high-pressure tank 10 (tank body 11) should be replaced. On the other hand, if no black scar is recognized on the appearance of the tank body 11, it is determined that the scratch due to the convex portion 32 has not reached the inner layer 54, and the impact applied to the tank body 11 is relatively small. be able to. In this case, it can be determined that the damage received by the inner layer 54 is within an allowable range.

  If even one scar reaching the inner layer 54 is recognized, if the tank body 11 is replaced, the possibility of continuing to use the tank body 11 even if the inner layer 54 is damaged is further reduced. be able to. On the other hand, different criteria for replacement of the tank body 11 may be provided, for example, by obtaining a correlation between the degree of impact applied to the high-pressure tank 10 and the state of scars formed in the outer layer 56. For example, when the range in which the scar reaching the inner layer 54 is formed exceeds a predetermined reference range, the tank body 11 may be replaced.

  According to the high-pressure tank 10 of the present embodiment configured as described above, the impact applied to the tank body 11 due to the state of scars formed on the outer layer 56 by the convex portions 32 provided on the inner surface of the protector 20. Can be determined. Therefore, even if no major damage is observed on the appearance of the tank body 11, the possibility of damage occurring inside the inner layer 54 can be determined more appropriately. As a result, when a certain large impact is applied to the tank body 11, it is possible to recognize the fact and determine that the high-pressure tank 10 should be replaced. Further, if the impact applied to the tank main body 11 is within an allowable range, it can be determined that the tank main body 11 can be used continuously, and unnecessary tank replacement can be suppressed. Thus, it becomes easier to appropriately make a determination regarding whether or not the high-pressure tank 10 can be continuously used.

  In the present embodiment, a plurality of convex portions 32 are provided on the back side of the protector 20. Therefore, it is possible to determine the possibility of damage occurring in the tank body 11 due to an impact applied from the outside over a range in which the protector 20 is provided with the plurality of convex portions 32. Furthermore, it is possible to determine the distribution of impact applied to the tank body 11 based on a plurality of scars formed on the outer layer 56 by the plurality of convex portions 32. In the present embodiment, the plurality of convex portions 32 are regularly provided on the back side of the protector 20. Therefore, even when an impact is applied to the protector 20 in a relatively narrow range, it is possible to accurately determine the possibility of damage occurring in the tank body 11 due to the applied impact.

  In the present embodiment, the height h of the convex portion 32 and the thickness of the outer layer 56 are substantially the same. Therefore, when a relatively weak impact that does not require tank replacement is applied and only a part of the convex portion 32 bites into the reinforcing layer 52, the tip of the convex portion 32 does not reach the inner layer 54. Therefore, damage (delamination or fiber tear) that occurs inside the inner layer 54 due to impact is in an allowable range, and the tank strength is caused by the surface of the inner layer 54 being damaged by the convex portion 32 when the tank is used continuously. It can suppress that (the intensity | strength with respect to a tank internal pressure) falls.

  The strength of the impact applied to the tank body 11 may be determined by a method other than visual inspection of scars from the outside of the outer layer 56. For example, it may be determined whether or not a scar reaching the black CFRP layer is formed by imaging a region where the scar is formed in the outer layer 56 and analyzing the obtained image. Alternatively, a depth gauge may be used to measure the depth of each scar formed to determine whether a scar reaching the inner layer 54 has been formed. Also, the depth of the scar is measured by pressing the clay on the surface of the outer layer 56 where the scar is formed, copying the shape of the scar, and measuring the height of the projected convex portion corresponding to the scar. May be. If these methods are used, it is impossible to determine whether the scar has reached the inner layer 54 by visual appearance or the like, for example, when the inner layer 54 is not clearly colored, or the thickness of the outer layer 56 is convex. Even if it is thicker than 32, it is possible to make an appropriate judgment based on the depth of the scar. In addition, even when the entire height of the convex portion 32 does not bite into the outer layer 56, it is possible to adopt a criterion that the tank body 11 needs to be replaced.

  The height of the convex portion 32 and the thickness of the outer layer 56 are determined so that the degree of impact can be determined by the depth at which the convex portion 32 pierces the outer layer 56 (for example, when the impact is small, the tank body 11 need not be replaced). It is desirable to make it sufficiently large so that it can be determined. For example, when the outer layer 56 is too thin, a scar penetrating the outer layer 56 is formed even when a relatively small impact is applied, and it is sufficient to determine whether the tank body 11 needs to be replaced. This can be difficult to perform.

  Further, it is desirable that the thickness of the outer layer 56 be sufficiently thick so that the convex portion 32 does not reach the inner layer 54 until an impact to the extent that the tank body 11 needs to be replaced is applied. That is, the thickness of the outer layer 56 is desirably equal to or greater than the height of the convex portion 32. Thereby, when a relatively small impact is applied, it is possible to suppress a decrease in tank strength (strength with respect to tank internal pressure) due to damage to the inner layer 54.

  For example, the height of the convex portion 32 and the thickness of the outer layer 56 may be set based on a value allowed as a flaw depth on the tank surface, which is determined by provisions of various rules such as laws. . For example, in “Interpretation of technical standards for containers for international compressed hydrogen automobile fuel equipment” related to container safety regulations based on the High Pressure Gas Safety Law, the allowable flaw depth of the fiber reinforced plastic part in the fiber reinforced plastic composite container is 1.25 mm. It is specified that: Therefore, the height of the convex portion 32 and the thickness of the outer layer 56 can be set to 1.25 mm or less, for example.

B. Second embodiment:
FIG. 7 is a schematic cross-sectional view showing a state of a cross section perpendicular to the axial direction of the high-pressure tank 110 of the second embodiment. FIG. 7 shows a state before an impact is applied, as in FIG.

  The high pressure tank 110 of the second embodiment is different from the high pressure tank 10 of the first embodiment in that a spacer layer 40 is provided between the marking plate 30 of the protector 20 and the outer layer 56 of the tank body 11. . The spacer layer 40 is a softer layer than the outer layer 56 and has elasticity. Therefore, when an impact is applied to the tank body 11 via the protector 20, the spacer layer 40 can be compressed and penetrated by the convex portion 32. As described above, the spacer layer 40 may be a layer that does not prevent scar formation in the outer layer 56 according to the magnitude of the impact. The spacer layer 40 can be formed of, for example, a resin such as polyurethane or rubber.

  With such a configuration, the lower limit load at which the convex portion 32 forms a scar on the outer layer 56 is controlled by appropriately setting the hardness (hardness that prevents penetration of the convex portion 32) and the thickness of the spacer layer 40. can do. Thereby, when the load when an impact is applied to the high-pressure tank 110 is a light load that does not require tank replacement, it is appropriately determined that scar formation in the outer layer 56 is suppressed and the tank body 11 can be used continuously. Can be made easier.

  Further, according to the present embodiment, the impact can be dispersed by the spacer layer 40 when an impact is applied to the high-pressure tank 110. Therefore, it is possible to prevent the inner layer 54 from being damaged due to the concentration of the load in a limited narrow area, and to improve the durability of the high-pressure tank 110.

  Furthermore, according to the high pressure tank 110 of the second embodiment, the gap between the outer layer 56 and the marking plate 30 can be closed by the spacer layer 40. Therefore, it is possible to suppress the entry of foreign matter such as stepping stones when the vehicle travels into the gap. When foreign matter such as stepping stones enters the gap, when an impact is applied to the high-pressure tank 110, the load is transmitted in a small area where the foreign matter exists. As a result, even if the impact is relatively small, a larger load is applied to the limited area, and it is easy to cause more damage in the inner layer 54. Such inconvenience can be suppressed by closing the gap with the spacer layer 40.

C. Other embodiments:
(C-1) About outer layer:
In the first and second embodiments, the outer layer 56 is formed by FRP such as GFRP, but may have a different configuration. Even when the outer layer 56 is configured by FRP, the outer layer 56 may be formed by FRP including short fibers instead of FRP in which long fibers are wound. Moreover, you may form the outer layer 56 with materials other than FRP, for example, resin and rubber | gum. When an impact is applied, the convex portion 32 provided on the protector 20 can form a scar corresponding to the magnitude of the impact, and it is possible to determine whether or not the tank body 11 needs to be replaced based on the state of the scar. If it is.

  However, from the viewpoint of more uniformly forming the outer layer 56 having a desired thickness on the inner layer 54 without exposing the inner layer 54, the outer layer 56 is preferably formed by FRP. When the outer layer 56 is formed of resin or rubber that does not include reinforcing fibers, when an impact is applied, the outer layer 56 has a wider range with respect to the shape of the convex portion 32 at the collision location of the convex portion 32. There is a possibility that a trace generated in the outer layer 56 with respect to the applied impact force becomes larger, for example, the outer layer 56 is peeled off. In this case, the applied impact force may be overestimated. Further, since the reinforcing fiber is not included, the convex portion 32 that has bitten into the outer layer 56 easily reaches the inner layer 54. As a result, the inner layer 54 is damaged by the convex portion 32, the tank strength (the strength against the tank internal pressure) is lowered, and the possibility that the durability of the high-pressure tank is lowered is increased. From the viewpoint of suppressing such inconveniences, it is desirable that the outer layer be made of FRP.

(C-2) Inner layer:
The inner layer 54 may be formed by other than CFRP, and may be an FRP layer formed by winding long fibers. The CFRP layer has a hardness (hardness that prevents penetration of the convex portion 32) that is hardly damaged even when the convex portion 32 collides when an impact is applied, but a softer fiber than the carbon fiber. It may be used to form a softer inner layer 54.

  As described above, even when the inner layer 54 is formed of softer FRP, the inner layer 54 formed by the protrusions 32 is applied when an impact in which damage (delamination or fiber breakage) within the inner layer 54 is within an allowable range is applied. As long as the damage is suppressed. Thereby, when the said damage resulting from an impact is a tolerance | permissible_range, it can suppress that the intensity | strength (tank intensity | strength) with respect to the internal pressure of the inner layer 54 by the damage by the convex part 32 falls. In order to suppress damage to the inner layer 54 due to the convex portion 32, for example, the hardness (hardness that prevents penetration of the convex portion 32) and the thickness of the outer layer 56 and the spacer layer 40 may be adjusted. Specifically, for example, when the thickness of the outer layer 56 is made thicker than the height of the convex portion 32, the entire convex portion 32 bites into the outer layer 56, and it is determined that the magnitude of impact exceeds the allowable range. Even if it exists, damage to the inner layer 54 by the convex part 32 can be suppressed. However, from the viewpoint of reducing the thickness of the inner layer 54 and reducing the size of the entire high-pressure tank, it is desirable that the inner layer 54 is composed of a CFRP layer using carbon fiber having extremely high tensile strength.

(C-3) Application target of high-pressure tank:
In the first and second embodiments, the high-pressure tank is used for storing pressurized hydrogen, but may be used for storing pressurized fluid other than hydrogen.

  In the first and second embodiments, the high-pressure tank is mounted on the fuel cell vehicle and used to store hydrogen gas as the fuel gas supplied to the fuel cell. However, different configurations may be used. For example, the same effect can be obtained even when the present invention is applied to a fuel tank that is mounted on a moving body other than a fuel cell vehicle and stores a gas that is driving fuel. Further, the present invention may be applied to a high-pressure gas tank that stores a gas used in an apparatus other than the moving body. By disposing the protector 20 having a plurality of convex portions 32 at a location corresponding to an impact expected to be applied from the outside in the high-pressure tank, a scar corresponding to the magnitude of the impact is formed in the outer layer 56, and the high-pressure tank It is sufficient if it is possible to determine whether or not replacement is necessary.

  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 corresponding to the technical features in each embodiment described in the summary section of the invention are intended to solve part or all of the above-described problems, or one of the above-described effects. In order to achieve part or all, replacement or combination can be appropriately performed. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10,110 ... High pressure tank 11 ... Tank main body 12 ... Valve 14 ... Tank fixing member 15 ... Bolt 16 ... Mounting bracket 20 ... Protector 25 ... Substrate part 30 ... Marking plate 32 ... Convex part 40 ... Spacer layer 50 ... Liner 52 ... Reinforcement Layer 54 ... Inner layer 56 ... Outer layer 60 ... Interfering substance

Claims (1)

A high pressure tank,
A liner formed with an internal space for sealing the fluid;
A reinforcing layer covering the outer surface of the liner;
A protector disposed opposite to at least a part of the surface of the reinforcing layer;
With
The protector includes a plurality of convex portions projecting toward the reinforcing layer on a surface facing the reinforcing layer,
The reinforcing layer is
An inner layer provided by laminating on the liner and made of fiber reinforced plastic;
An outer layer covering the inner layer, and when an impact is applied from the outside of the protector, the outer layer generates a trace corresponding to the magnitude of the impact by being damaged by the convex portion;
With high pressure tank.

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