JP6323254B2 - tank - Google Patents

Description

  The present invention relates to a tank.

  Regarding the tank, Patent Document 1 discloses a technique for winding a fiber bundle on a dome portion of a liner having a base by helical winding. Patent Document 2 discloses a technique in which a base having an opening in a curved dome is provided with a base attached to the opening, and a resin seal member is applied to the boundary between the tank and the base on the tank surface. ing.

International Publication No. 2010/116527 JP 2012-225373 A

  However, neither the technique disclosed in Patent Document 1 nor the technique disclosed in Patent Document 2 assumes that the fiber bundle slips when the fiber bundle is helically wound around the dome portion of the tank. For this reason, when the fiber bundle is helically wound around the dome portion of the tank, the dome portion has a curved surface. Therefore, depending on the thickness and shape of the seal member, the fiber bundle may be displaced radially outward of the dome portion.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

  According to one aspect of the invention, a tank is provided. The tank includes a liner having a curved dome at an end; a base disposed in the dome; an annular sealing member that covers a boundary between the dome and the base on the surface of the dome A fiber bundle wound helically on the seal member and the liner, and the seal member gradually increases in thickness from the inner peripheral side to the outer peripheral side of the seal member. It has an inclined part, and at least a part of the center in the width direction of the fiber bundle is located on the inner peripheral side of the seal member relative to the outer peripheral side end of the inclined part. According to the tank of such a form, since the force toward the radially outer side of the tank received by the fiber bundle can be reduced by the inclined portion, the sealing member is flat to prevent the fiber bundle from shifting radially outward of the tank. It can be suppressed compared to the case.

  The present invention is not limited to the form of the tank described above, and can be implemented in various forms. For example, it is realizable with forms, such as a manufacturing method of a tank, and a winding method of a fiber bundle.

It is a figure which shows typically the tank in 1st Embodiment. FIG. 2 is a view taken in the direction of arrow X in FIG. 1. It is a figure which shows typically the 3-3 cross section in FIG. FIG. 3 is a perspective view schematically showing the vicinity of a 3-3 cross section in FIG. 2. It is a figure which shows typically the cross section of a tank without an inclination part. It is a figure which shows the other example of the cross-sectional shape of a sealing member. It is a figure which shows typically the cross section of the tank in 2nd Embodiment.

A. First Embodiment FIG. 1 is a diagram schematically illustrating a tank according to a first embodiment. FIG. 2 is a view taken in the direction of arrow X in FIG. The tank 1 includes a liner 10, a fiber bundle 20, a base 30, and a seal member 40. The tank 1 stores high-pressure (70 MPa) hydrogen gas. The tank 1 has a cap 30 at one end and has a cylindrical shape with both ends formed in a curved shape. The tank 1 is, for example, a long tank, the length of the tank 1 is 1 m to 2 m, and the relationship between the length L of the tank 1 and the diameter D of the tank 1 is L / D> 2. In FIG. 1, a part of the fiber bundle 20 is shown.

  The liner 10 is made of a thermoplastic resin such as polyethylene, nylon, polypropylene, or polyester. The liner 10 includes a straight portion 11 having a cylindrical shape, and a first dome portion 12 and a second dome portion 13 formed in curved shapes at both ends of the straight portion 11. The first dome portion 12 has an opening 14 for inserting the base 30. The inner periphery of the opening 14 is formed in a gear shape so as to correspond to the outer shape of the base 30. When the inner periphery of the opening 14 is gear-shaped, it is possible to prevent the liner 10 from idling when the fiber bundle 20 is wound and the tank 1 is rotated while holding the base 30.

  The base 30 is made of, for example, a metal such as aluminum or stainless steel. The outer shape of the base 30 is a funnel shape, and the outer shape of the large diameter portion having the largest diameter is a gear shape. The base 30 is fitted to the opening 14 of the first dome portion 12 at the large diameter portion. A hole is formed at the center of the base 30 in the base 30, and a valve for taking out the high-pressure gas in the tank 1 by depressurizing is inserted into the hole.

  The seal member 40 is made of, for example, a resin such as fluorine, nitrile, silicon, or urethane. The resin preferably has elasticity. The friction coefficient of the seal member 40 is larger than the friction coefficient of the first dome portion 12 and the base 30. The seal member 40 is bonded on the boundary 50 so as to cover the boundary 50 between the first dome portion 12 and the base 30 on the surface of the first dome portion 12, and suppresses gas from leaking from the boundary 50. ing. As shown in FIG. 2, the seal member 40 is annular, and the inner peripheral side end of the seal member 40 is located on the base 30, and the outer peripheral side end of the seal member 40 is located on the first dome portion 12. .

  The fiber bundle 20 is formed, for example, by bundling about 10,000 to 40,000 glass fibers and carbon fibers and impregnating a thermosetting resin such as epoxy. In this embodiment, the fiber bundle 20 is wound on the seal member 40 and the liner 10 by helical winding. Specifically, the fiber bundle 20 is wound by low-angle helical winding in a range including the first dome portion 12 and the second dome portion 13 at a winding angle of 0 to 30 degrees with respect to the central axis O of the tank 1. Is done. As shown in FIG. 2, at least a part of the center of the fiber bundle 20 in the width direction crosses the apex 41 (details will be described later) of the seal member 40 that is the outer peripheral side end of the seal member 40 and the inclined portion 42. Wound around. The fiber bundle 20 is wound by hoop winding that winds the straight portion 11 in the circumferential direction at a winding angle of 80 to 90 degrees with respect to the central axis O of the tank 1. The fiber bundle 20 may be a prepreg in which a plurality of fibers are impregnated with a thermosetting resin in advance and semi-cured or dried.

  FIG. 3 is a diagram schematically showing a 3-3 cross section in FIG. 2. FIG. 4 is a perspective view schematically showing the vicinity of the 3-3 cross section in FIG. The 3-3 cross section is a cross section passing through the central axis O of the tank 1 and the point where the fiber bundle 20 is closest to the central axis O of the tank 1. 3 and 4 show only one fiber bundle 20 that is closest to the central axis O of the tank 1.

  A recess 15 is formed in the first dome portion 12 at a portion where the base 30 is fitted. The base 30 is fitted in the recess 15 so that there is no step at the boundary 50 between the first dome part 12 and the base 30 on the surface of the first dome part 12.

  The thickness of the sealing member 40 gradually increases from the inner peripheral side (lower side in FIG. 3) of the sealing member 40 toward the outer peripheral side (upper side in FIG. 3). 41 has an inclined portion 42 having a maximum thickness. The thickness of the seal member 40 gradually decreases gradually from the inclined portion 42 toward the outer peripheral side, and then the reduction rate increases. That is, the cross-sectional shape of the seal member 40 of the present embodiment is a substantially trapezoidal shape with a short side having an arc shape. The apex 41 of the seal member 40 is arranged in a circle so as to correspond to the vicinity of the boundary 50 between the first dome portion 12 and the base 30 when the first dome portion 12 is viewed from the direction of the central axis O of the tank 1. (See FIG. 2). The maximum thickness of the seal member 40 is about several mm. In this case, at least a part of the center in the width direction of the fiber bundle 20 is located on the inner peripheral side of the seal member 40 relative to the vertex 41 of the seal member 40 that is the outer peripheral side end of the inclined portion 42.

  Next, advantages of the present embodiment will be described with reference to FIGS. FIG. 5 is an explanatory view schematically showing a cross section of a tank without an inclined portion. A helical winding tension T <b> 1 is applied to the fiber bundle 20. The winding tension T1 can be decomposed into a force T2 that slides radially outward of the tank 1 and a force T3 that is perpendicular to the contact portion at the contact portion between the fiber bundle 20 and the base 30. That is, the fiber bundle 20 receives a force T2 that slides outward in the radial direction of the tank 1. Therefore, there is a possibility that the fiber bundle 20 slips outward in the radial direction of the tank 1.

  On the other hand, as shown in FIG. 3, in this embodiment, the fiber bundle 20 is disposed on the inclined portion 42 of the seal member 40. Therefore, compared with the case where there is no inclined portion 42, the inclined portion 42 reduces the force T <b> 2 that slides outward in the radial direction of the tank 1 received by the fiber bundle 20 at the contact portion of the fiber bundle 20. Therefore, according to the present embodiment, it is possible to suppress the fiber bundle 20 from shifting to the radially outer side of the tank 1. In addition, it is possible to suppress the fiber bundle 20 from being displaced outward in the radial direction of the tank 1 as the force received by the fiber bundle 20 at the contact portion of the fiber bundle 20 is closer to the contact portion.

  FIG. 6 is a diagram illustrating another example of the cross-sectional shape of the seal member. In the present embodiment, the cross-sectional shape of the seal member 40 is a substantially trapezoidal shape having an arc on the short side. For example, as shown in FIG. 6, the cross-sectional shape of the seal member may be an arc shape.

B. Second Embodiment FIG. 7 is a diagram schematically showing a cross-sectional view of a tank according to a second embodiment. FIG. 7 shows a cross section passing through the central axis O of the tank 1 and the point where the fiber bundle 20 is closest to the central axis O of the tank 1. In FIG. 7, components indicated by the same reference numerals as those used in the description of the first embodiment are substantially the same as the components in the first embodiment. In the second embodiment, the cross-sectional shape of the seal member 40a is not a substantially trapezoidal shape having an arc, but a triangle. Specifically, the thickness of the seal member 40a gradually increases from the inner peripheral end of the seal member 40a to the apex 41a of the seal member 40a and then gradually decreases to the outer peripheral end of the seal member 40a. At least a part of the center in the width direction of the fiber bundle 20 is located on an inclined portion 42a formed between the inner peripheral side end of the seal member 40a and the vertex 41a of the seal member 40a. That is, at least a part of the center in the width direction of the fiber bundle 20 is located on the inner peripheral side of the seal member 40a with respect to the vertex 41a of the seal member 40a that is the outer peripheral side end of the inclined portion 42a. The apex 41 of the seal member 40 is located closer to the first dome portion 12 than the center of the cross section of the seal member 40. Therefore, the length of the surface portion of the inclined portion 42a in the cross section is larger than the length of the surface portion other than the inclined portion 42a. For these reasons, the inclined portion 42a has a larger surface area than the inclined portion 42 of the first embodiment. Thereby, even when the width of the fiber bundle 20 is wide, the fiber bundle 20 can be stably disposed on the inclined portion 42, and the fiber bundle 20 can be prevented from being displaced outward in the radial direction of the tank 1.

C. Modification <Modification 1>
In the above embodiment, the fiber bundle 20 is wound around the first dome portion 12 and the seal member 40. However, the fiber bundle 20 is wound around the base 30 where the seal member 40 is not bonded. May be.

<Modification 2>
In the above embodiment, the gas filled in the tank 1 is hydrogen. However, the gas is not limited to hydrogen, and methane, CNG, nitrogen, or the like can be filled. Moreover, what is filled in the tank 1 may be a liquid such as liquid hydrogen. Moreover, in the said embodiment, although the gas with which the tank 1 is filled was high voltage | pressure, the gas to be filled may be low pressure | voltage.

<Modification 3>
In the said embodiment, although the fiber bundle 20 showed the example wound around the 1st dome part 12 and the 2nd dome part 13 by a low angle helical, the winding angle of helical winding is not restricted to this. The fiber bundle 20 is a medium angle helical winding wound at a winding angle of 30 to 70 degrees with respect to the central axis O of the tank 1 and a high angle helical winding wound at a winding angle of 70 to 80 degrees. It may be wound around the dome part 12 and the second dome part 13.

<Modification 4>
In the said embodiment, although the inclined part 42 in the seal member 40 was formed from the inner peripheral side edge part of the seal member 40, it is not restricted to this. The thickness of the seal member 40 may be constant in a certain range from the inner peripheral side end of the seal member 40 to the outer peripheral side, and then the thickness of the seal member 40 may be increased to form an inclined portion.

<Modification 5>
In the above embodiment, the outer diameter of the large-diameter portion of the base 30 fitted to the opening 14 of the liner 10 is a gear shape, but the outer diameter of the large-diameter portion is not limited to this. The outer diameter of the large diameter portion may be a polygon, an ellipse, or a circle.

  The present invention is not limited to the above-described embodiments and modifications, and can be realized with various configurations without departing from the spirit thereof. 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 ... Tank 10 ... Liner 11 ... Straight part 12 ... 1st dome part 13 ... 2nd dome part 14 ... Opening part 15 ... Recessed part 20 ... Fiber bundle 30 ... Base 40, 40a ... Seal member 41, 41a ... Apex of seal member 42, 42a ... inclined portion 50 ... boundary O ... center axis of tank T1, T2, T3 ... tension

Claims (1)

A tank,
A liner having a curved dome at the end;
A base disposed in the dome,
An annular seal member that covers the boundary between the dome and the base on the surface of the dome;
A fiber bundle wound helically on the seal member and the liner;
With
The seal member has an inclined portion where the thickness of the seal member gradually increases from the inner peripheral side to the outer peripheral side of the seal member;
The tank, wherein at least a part of the center in the width direction of the fiber bundle is located on the inner peripheral side of the seal member with respect to the outer peripheral side end of the inclined portion.

Images