JP2018105338A - High-pressure tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high-pressure tank which can suppress the generation of stress at a liner caused by the pressure of a gas when charging the gas into the liner which is in a low-temperature state while securing seal performance between a mouthpiece and the liner.SOLUTION: A metal-made wave spring 24 is interposed between a sidewall part 12B1 of a liner 12 and a flange part 14B of a mouthpiece 14. The wave spring 24 energizes the sidewall part 12B1 to a direction progressing toward the sidewall part 12B1 from the flange part 14B by being pressed by the sidewall part 12B1 to a direction progressing toward the flange part 14B from the sidewall part 12B1. Therefore, when charging a gas into the liner 12, the sidewall part 12B1 is pressed to the flange part 14B side by the pressure of the gas, however, a pressing force generated by the gas to the sidewall part 12B1 is canceled by an energization force from the wave spring 24.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-pressure tank.

  Patent Document 1 below discloses an invention related to a pressure vessel. In this pressure vessel, an annular groove formed in an annular shape when viewed from the inside of the pressure vessel is provided in the flange portion of the base, and the inner peripheral portion of the liner constituting the pressure vessel is fitted into the annular groove. Has been. The annular groove is configured such that the inner peripheral portion of the inserted liner is slidable toward the radially outer side of the liner.

  For this reason, in the prior art described in Patent Document 1 below, when the liner contracts due to a temperature change or the like, the inner peripheral portion slides in a direction to escape from the annular groove formed in the base, and the liner changes due to a temperature change or the like. The application of stress is suppressed. In addition, since the inner peripheral portion is maintained in the fitted state with the annular groove even after the slide movement, the sealing performance between the base and the liner can be ensured.

JP 2000-291888 A

  However, in the above-described prior art, when a low-pressure liner is filled with high-pressure gas, the inner peripheral portion of the liner slides due to expansion and deformation of the liner until it is regulated by the annular groove, and the inner periphery of the liner It is conceivable that stress due to gas pressure is generated in the part. In other words, the above prior art is improved in that it suppresses the occurrence of stress due to gas pressure in the liner when filling the gas in the low temperature liner while ensuring the sealing performance between the base and the liner. There is room.

  In consideration of the above-mentioned fact, the present invention is capable of suppressing the occurrence of stress due to the gas pressure in the liner when filling the liner in a low temperature state while ensuring the sealing performance between the base and the liner. The purpose is to obtain a tank.

  A high-pressure tank according to the present invention as set forth in claim 1 is a liner having a wall portion and an opening formed integrally with the wall portion provided at an end portion, and a liner made of resin. The insertion portion inserted into the liner from the opening in a state of being slidable in contact with the opening directly or via a member, and the liner facing the wall portion with a predetermined interval A base part formed with a through part that communicates the inside and the outside of the liner, a reinforcing layer made of fiber reinforced resin covering the collar part and the liner, and The wall is interposed between the wall and the flange, and is pressed by the wall in a direction from the wall toward the flange. The wall is biased in the direction from the flange toward the wall. A metal urging member.

  According to the first aspect of the present invention, the high-pressure tank is configured to include a liner made of resin, a base, and a reinforcing layer made of fiber reinforced resin. The liner has a cylindrical shape with a wall portion and an opening portion formed integrally with the wall portion provided at an end portion, and the insertion portion of the base is slid directly or via a member in the opening portion. It is inserted into the liner from the opening in a state where contact is possible. And the penetration part is formed in the nozzle | cap | die and the inner side and the outer side of a liner are connected by the said penetration part.

  On the other hand, the base is provided with a collar, and the collar is opposed to the wall of the liner and disposed outside the liner with a predetermined interval. The collar and the liner are provided with a reinforcing layer. Covered by. For this reason, in this invention, high pressure gas can be filled from the penetration part of a nozzle | cap | die, and it can store inside a liner. In addition, even if the liner contracts due to a temperature change or the like, the opening of the liner slides with respect to the insertion portion of the base, so that the stress due to the temperature change or the like is suppressed on the liner. Furthermore, since the pressure from the gas filled in the liner is applied to the opening of the liner, and the opening is pressed toward the insertion portion of the base, the sealing property between the base and the liner can be ensured. it can.

  By the way, when a low-pressure liner is filled with a high-pressure gas, the opening in the wall of the liner and its peripheral part slide along the insertion part of the base, and stress due to the pressure of the gas is applied to the liner. May occur.

  Here, in the present invention, a metal urging member is interposed between the wall portion provided at the end portion of the liner and the collar portion of the base. The urging member is urged by the wall portion of the liner in a direction from the wall portion toward the flange portion of the base, thereby urging the wall portion in a direction from the flange portion toward the wall portion. Yes. For this reason, when the liner is filled with a gas, the wall portion of the liner is pressed against the flange side of the base by the pressure of the gas, but the wall is pressed against the wall portion by the urging force from the urging member. The pressure is offset.

  As described above, the high-pressure tank according to the first aspect of the present invention has the stress caused by the gas pressure in the liner when the liner in the low temperature state is filled with the gas while ensuring the sealing property between the base and the liner. It has the outstanding effect that generation | occurrence | production of can be suppressed.

It is a fragmentary sectional view showing the composition of the high-pressure tank concerning this embodiment. It is sectional drawing which shows the behavior of the principal part of the high-pressure tank which concerns on this embodiment, (A) has shown the state when a liner is low temperature and the inside of a liner is low pressure, (B) is a liner low temperature And the state when the inside of a liner is a high voltage | pressure is shown.

  Hereinafter, an example of an embodiment of a high-pressure tank according to the present invention will be described with reference to FIGS. 1 and 2. The “high pressure tank 10” according to the present embodiment is mounted on a fuel cell vehicle and stores high pressure hydrogen gas supplied to the fuel cell stack. The high-pressure tank 10 is mounted on the vehicle with its longitudinal direction being the vehicle width direction.

  The high-pressure tank 10 includes a “liner 12” constituting the inner shell, a pair of “bases 14” attached to the liner 12, and a “reinforcing layer 16” that covers a part of the base 14 and the liner 12. It consists of

  The liner 12 is made of resin (for example, made of polyamide 6 resin), and is provided at each of the cylindrical cylindrical portion 12A constituting the main portion thereof and the peripheral portions on both sides in the longitudinal direction of the cylindrical portion 12A. And a dome portion 12B.

  Specifically, the dome portion 12B includes a “side wall portion 12B1” as a wall portion constituting the end portion of the liner 12, and an “opening portion 12B2” provided integrally with the side wall portion 12B1 at the center portion of the side wall portion 12B1. And a curved wall portion 12B3 that connects the side wall portion 12B1 and the cylindrical portion 12A.

  The side wall portion 12 </ b> B <b> 1 is disposed so that the plate thickness direction is the longitudinal direction of the high-pressure tank 10 and is formed in a disc shape when viewed from the longitudinal direction of the high-pressure tank 10. On the other hand, the curved wall portion 12B3 extends from the peripheral portion of the side wall portion 12B1 toward the outer side in the radial direction of the cylindrical portion 12A, and the center side of the cylindrical portion 12A is the center of curvature when viewed from the radial direction of the cylindrical portion 12A. It is formed along the circular arc. The opening 12B2 is formed in a cylindrical shape extending from the side wall 12B1 toward the inside of the liner 12.

  The base 14 is made of metal (for example, made of an aluminum alloy), and has a cylindrical main body portion 14A and a radially central portion of the main body portion 14A from the outer peripheral surface to the radially outer side of the main body portion 14A. And an extended disc-shaped “ridge 14B”. A valve for supplying hydrogen or the like can be attached to a portion on one side in the longitudinal direction of the main body portion 14A (hereinafter, this portion is referred to as a mounting portion 14A1), and the other longitudinal direction in the main body portion 14A. The side portion is inserted into the opening 12B2 of the liner 12 (hereinafter, this portion is referred to as “insertion portion 14A2”). That is, in a state where the base 14 is attached to the liner 12, the collar portion 14 </ b> B is disposed on the outside of the liner 12 so as to face the side wall portion 12 </ b> B <b> 1 of the liner 12 and at a predetermined interval.

  Further, a “penetrating portion 18” is formed along the axis of the main body portion 14 </ b> A, and the inner side and the outer side of the liner 12 are communicated by the penetrating portion 18. Furthermore, a groove portion 20 is formed along the circumferential direction of the main body portion 14A on the distal end side of the insertion portion 14A2 in the main body portion 14A (the front end portion side of the opening 12B2 in the liner 12). Is fitted with an “O-ring 22 (seal member)” as a member. The insertion portion 14A2 is in a state where it can be slidably contacted with the opening 12B2 via the O-ring 22. In the present embodiment, two caps 14 are provided in the high-pressure tank 10, but a configuration in which only one cap 14 is provided in the high-pressure tank 10 may be used depending on the configuration of the vehicle. Alternatively, the insertion portion 14A2 and the opening 12B2 may be subjected to a surface treatment or the like so that the insertion portion 14A2 can be directly slidably contacted with the opening 12B2.

  The reinforcing layer 16 is made of fiber reinforced resin (for example, made of carbon fiber reinforced resin (CFRP)), and covers the collar portion 14B of the base 14 and the liner 12. Specifically, the portion of the reinforcing layer 16 covering the cylindrical portion 12A of the liner 12 is mainly configured by hoop winding of carbon fiber, and covers the flange portion 14B of the reinforcing layer 16. The portion is configured by helically winding carbon fibers. A method for forming the reinforcing layer 16 will be described in detail later. Further, the reinforcing layer 16 may be partially or entirely made of glass fiber reinforced plastic.

  Here, the present embodiment is characterized in that one “wave spring 24” made of steel as an urging member is disposed between the side wall portion 12B1 of the liner 12 and the flange portion 14B of the base 14. is there. Hereinafter, the configuration of the wave spring 24 constituting the main part of the present embodiment will be described in detail.

  The outer shape of the wave spring 24 is formed in a cylindrical shape, and the wave spring 24 is mounted on the base end side of the insertion portion 14A2 in the main body portion 14A in a state where the axial direction is the longitudinal direction of the main body portion 14A of the base 14. ing. The wave spring 24 is an elastic member that can be elastically deformed in the axial direction, and can apply a biasing force to the side wall portion 12B1 of the liner 12 in a state where the base 14 is attached to the liner 12. .

  More specifically, the wave spring 24 is pressed by the side wall portion 12B1 in the direction from the side wall portion 12B1 toward the flange portion 14B, thereby biasing the side wall portion 12B1 in the direction from the flange portion 14B toward the side wall portion 12B1. It has become. Further, when the liner 12 is at a low temperature (−60 [° C.]), the sum of the pressures of the hydrogen gas acting on the side wall portion 12B1 is F1 [N], and the sum of the pressure acting on the opening portion 12B2 and the opening portion 12B2 And the sum of the elastic force of the O-ring 22 is F2 [N], the dynamic friction coefficient between the O-ring 22 and the insertion portion 14A2 is μ [-], and allowable stress is generated when pressed by hydrogen gas. Assuming that the displacement (deformation stroke) of the side wall 12B1 is dL [mm] and the spring constant of the wave spring 24 is K [N / mm], a relationship of F1 ≦ μF2 + KdL is established between them. doing. Note that μ can be adjusted by changing the collapse amount of the O-ring 22. Further, a configuration using a coil spring instead of the wave spring 24 is also possible.

  In the present embodiment, as described above, the high-pressure tank 10 is provided with the reinforcing layer 16. However, when the carbon fiber is hoop-wrapped around the cylindrical portion 12 </ b> A of the liner 12 in the first step, the liner 12 and the base 14. It is thought that carbon fiber bites into the gap. For this reason, when the carbon fiber of at least the first layer of the reinforcing layer 16 is wound, helical winding is performed across the gap between the liner 12 and the base 14. In this embodiment, the method of forming the reinforcing layer 16 by helical winding differs depending on the magnitude of the spring constant K of the wave spring 24. Hereinafter, a method for forming the reinforcing layer 16 according to the spring constant K will be described.

  First, a case where the spring constant K is larger than a predetermined value will be described. In this case, since the reaction force of the wave spring 24 can be sufficiently secured against the tension when the carbon fiber is helically wound, the carbon fiber is secured while ensuring a gap between the liner 12 and the base 14. Can be wound. Therefore, the base 14 with the wave spring 24 mounted thereon is attached to the liner 12, and the carbon fiber is helically wound in this state.

  On the other hand, when the spring constant K is equal to or less than a predetermined value, it is difficult to sufficiently secure the reaction force of the wave spring 24 against the tension when the carbon fiber is helically wound. Is used. Specifically, a jig is inserted into the base 14 and the liner 12 to which the wave spring 24 is attached, and the jig and the base 14 disposed at both ends of the liner 12 are fastened. Then, a support having a variable mechanism having a pantograph structure is inserted into the gap between the liner 12 and the base 14 as an example. In this state, the carbon fiber is helically wound.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, the high-pressure tank 10 is configured to include a liner 12 made of resin, a base 14, and a reinforcing layer 16 made of fiber reinforced resin. The liner 12 has a cylindrical shape in which an end portion is provided with a side wall portion 12B1 and an opening portion 12B2 formed integrally with the side wall portion 12B1, and the insertion portion 14A2 of the base 14 is inserted into the opening portion 12B2. -It is inserted into the inside of the liner 12 from the opening 12B2 in a state where it can be slidably contacted via the ring 22. A through-hole 18 is formed in the base 14, and the inside and the outside of the liner 12 communicate with each other through the through-hole 18.

  On the other hand, the base 14 includes a collar portion 14B, and the collar portion 14B is disposed on the outside of the liner 12 so as to face the side wall portion 12B1 of the liner 12 and at a predetermined interval. The liner 12 is covered with a reinforcing layer 16. For this reason, in this embodiment, high-pressure gas can be filled through the through portion 18 from a hydrogen supply valve or the like attached to the attachment portion 14A1 of the base 14 and stored inside the liner 12. Moreover, even if the liner 12 contracts due to a temperature change or the like, the opening 12B2 of the liner 12 slides with respect to the insertion part 14A2 of the base 14, so that stress due to a temperature change or the like is not applied to the liner 12. The Further, pressure from the gas filled in the liner 12 is applied to the opening 12B2 of the liner 12, and the opening 12B2 is pressed toward the insertion portion 14A2 of the base 14, so that the connection between the base 14 and the liner 12 occurs. Sealability can be secured.

  By the way, as shown in FIG. 2, when the high-pressure gas is filled in the low-temperature and low-pressure liner 12 (see FIG. 2A), the opening 12B2 in the side wall 12B1 of the liner 12 and its peripheral portion are It slides along the insertion portion 14A2 of the base 14 (see FIG. 2B). As a result, it is considered that stress due to gas pressure is generated in the liner 12. In FIG. 2B, the side wall portion 12B1 of the liner 12 in the low temperature and low pressure state is indicated by a two-dot chain line.

  Here, in the present embodiment, a metal wave spring 24 is interposed between the side wall portion 12B1 of the liner 12 and the flange portion 14B of the base 14. The wave spring 24 is pressed by the side wall part 12B1 in the direction from the side wall part 12B1 toward the flange part 14B, so that the side wall part 12B1 is urged in the direction from the flange part 14B toward the side wall part 12B1. It has become. For this reason, when the liner 12 is filled with gas, the side wall 12B1 is pressed toward the flange 14B by the pressure of the gas, but due to the urging force from the wave spring 24, the pressing force on the side wall 12B1 by the gas is increased. Offset.

  Therefore, in the present embodiment, it is possible to suppress the occurrence of stress due to the gas pressure in the liner 12 when the liner 12 in the low temperature state is filled with gas while ensuring the sealing performance between the base 14 and the liner 12. it can.

10 High-pressure tank 12 Liner 12B1 Side wall (wall)
12B2 Opening part 14 Base 14A2 Insertion part 14B Gutter part 16 Reinforcement layer 18 Penetration part 22 O-ring (member)
24 Wave spring (biasing member)

Claims (1)

A wall and a liner formed integrally with the wall and a cylindrical shape provided at the end, and a liner made of resin;
An insertion portion inserted into the liner from the opening in a state where the opening is slidable directly or via a member, and the wall portion is opposed to the insertion portion with a predetermined interval. A base portion provided with a collar portion formed on the outer side, and a base formed with a penetrating portion communicating the inner side and the outer side of the liner;
A reinforcing layer made of fiber reinforced resin covering the flange and the liner,
The wall portion is interposed between the wall portion and the flange portion and pressed by the wall portion in the direction from the wall portion toward the flange portion, thereby biasing the wall portion in the direction from the flange portion toward the wall portion. A metal biasing member that
Having high pressure tank.