JP4820804B2 - Deep sea exploration vehicle pressure vessel - Google Patents

Description

  The present invention relates to a pressure vessel in which electronic equipment for a deep sea exploration vehicle is accommodated, and more particularly to a pressure vessel for external pressure having high buckling resistance and high specific strength, and a method for manufacturing the same.

  In recent years, attention has been paid to the development of seabeds and marine resources (useful substances from deep-sea microorganisms, deep-sea fish, etc., minerals such as gas hydrates and precious metals). In particular, the development of resources in the deep sea (several thousand to 10,000 m, several hundred to 1000 atmospheres) under a high pressure is under active development. It is difficult to form a room that can withstand such high pressures in the deep sea and that can secure a passenger's living space, and the risk of crushing also increases. (Vehicle) is frequently used.

  As shown in FIG. 9, the vehicle includes an autonomous unmanned explorer (FIG. A) and a remote control unmanned explorer (FIG. B). The autonomous unmanned explorer (hereinafter referred to as AUV) is powered by the vehicle C1. It is equipped with a source (battery) and can be independently explored. One remote-operated unmanned explorer (hereinafter referred to as ROV) is such that the vehicle C2 is supplied with electric power from the marine research vessel A2 via the tether cables (21, 22), and cannot be independently explored. Further, signals from the observation equipment mounted on the vehicle C2 are transmitted to the control device of the oceanographic survey ship A2 and the observation television via the tether cables 21 and 22.

  As shown in FIG. 9, AUV type and ROV type vehicles C1 and C2 include a cylindrical pressure vessel 29 that houses batteries, various control devices and observation devices, and a bumper 27 and a frame 26 that protect the pressure vessel 29 and the like. , Buoyancy material 28, thruster 25, and the like.

  The pressure vessel 29 is formed by watertightly closing a cylindrical tube body and both ends of the tube body with end plates. The pressure vessel 29 is an observation device such as a CCD camera, a control device such as a vehicle attitude control, a manipulator or a vehicle floating surface. Various devices and devices such as a time recovery signal generator are housed.

  Further, a buoyancy material 28 is provided so that the vehicle can stand still at a fixed depth without sinking or rising in the sea, and neutral buoyancy is imparted to the vehicle.

  In particular, the need for a vehicle capable of exploring in the deep sea of the 10,000 m class is increasing recently, so that the buoyancy material 28 is several tens of μm so as not to be crushed under a high pressure of several hundred to 1,000 atm. A hollow glass sphere made of epoxy resin or the like is used.

  In addition, since the vehicle takes about 4 hours to dive on the seabed of about 6,000 m, for example, and takes about 4 hours, it is desired that the exploration time per time is long. Therefore, in order to enable precise control of the vehicle even when the driving force of the thruster 25 that consumes the most electric power is reduced, the total weight of the vehicle is generally reduced. Specifically, the bumper 27, the frame 26, and the pressure vessel 29 are manufactured from a light metal alloy titanium alloy or aluminum alloy, and a manipulator, an underwater illumination, or the like is downsized. Furthermore, the bumper 27 and the frame 26 do not need to have a pressure-resistant structure, so a round or square pipe is used, and a pressure equalizing structure that allows water to enter the pipe reduces the thickness to reduce the weight. ing.

  However, since the pressure vessel 29 is a hollow vessel and is assumed not to be crushed, there is a limit to reducing the thickness for weight reduction, and it is impractical to reduce the thickness and reduce the weight. .

As an advantage of weight reduction, in the case of AUV, energy consumption is reduced and the exploration time is extended. In addition, there is a point that the amount of buoyancy material 28 used can be reduced by weight reduction. Since the buoyancy material is not crushed under a high pressure of several hundred to 1,000 atmospheres as described above, the buoyancy material is very expensive. Therefore, since the specific weight of the buoyancy material is usually 0.4 to 0.6 kg / dm ³ , the amount of buoyancy material used can be reduced by reducing the volume of the buoyancy material even if the weight is reduced slightly. Cost can be reduced. In addition, the volume of the vehicle itself is reduced, water resistance is reduced, and mobility is improved.

  Therefore, in order to further reduce the weight, research has been conducted to make the material used for the pressure resistant container 29 lighter, and in particular, ceramics and magnesium alloys are attracting attention. However, as a pressure vessel made of metal, a material having strength (buckling resistance) superior to titanium alloy or aluminum alloy and high specific strength has not been realized yet, so it can be combined with other materials (hybridization) ) Is drawing attention.

As a hybrid of metal pressure vessel, a hybrid pressure vessel of FRP and metal in which continuous long fiber impregnated with resin is wound on a metal liner is proposed as a pressure vessel that is lighter and stronger. (For example, patent document 1).
JP 2001-153296 A

  The hybrid pressure vessel described in Patent Document 1 is formed by winding continuous carbon fibers on an aluminum liner by a filament winding method (hereinafter, FW method). In this hybrid pressure vessel, the tension of the wound carbon fiber acts on the metal vessel, so that it is stronger than the strength of the metal vessel itself, but CNG (compressed natural gas) and LNG (liquefied natural gas) , A pressure-resistant container for filling compressed gas such as LPG (liquefied petroleum gas) or liquefied gas, and is not supposed to be used in a situation where external pressure is applied like a pressure-resistant container of a vehicle. The strength is unknown.

  Moreover, if the entire surface of the pressure vessel is covered with a material whose thermal conductivity is lower than that of metal such as FRP, the temperature in the vessel rises due to heat generated from various devices and devices housed in the pressure vessel, Eventually, malfunctions and malfunctions of electronic devices may cause accidents such as vehicle malfunctions and inoperability.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure vessel for external pressure that has a reduced weight, improved pressure resistance and heat dissipation (thermal conductivity) in a pressure vessel for vehicles.

The pressure vessel according to the present invention for solving the above problems is
1) A fiber reinforced resin layer is integrally formed on the outer peripheral surface of a cylindrical metal core material whose openings at both ends are closed by end plates, and further, a predetermined interval in the axial direction of the core material is formed on the outer peripheral surface of the core material. A plurality of annular ridges are integrally formed in the fiber-reinforced resin layer, the long fibers are aligned in one direction and impregnated with a thermosetting resin, and a semi-cured prepreg sheet is used, The prepreg sheet is cut into a length that covers the entire cylindrical outer peripheral surface of the core material to form a prepreg sheet piece, and the prepreg sheet piece is inclined or orthogonally cut with respect to the fiber length direction. When the sheet pieces are wound and laminated on the outer peripheral surface of the core material, the fiber directions of the lower layer sheet piece and the upper layer sheet piece are laminated so as to cross each other.
2) The core material is formed of a light metal alloy such as a titanium alloy or an aluminum alloy, and the long fiber of the sheet piece constituting the fiber reinforced resin layer is carbon fiber, boron fiber, glass fiber, or carbon fiber and boron. It is characterized by comprising at least two types of fibers selected from fibers and glass fibers.
3) The pressure vessel is a pressure vessel that accommodates electronic equipment such as observation equipment for a deep sea exploration vehicle.

  The fiber reinforced resin layer in the present invention forms a band-like body in which long fibers having high tension such as carbon fibers are arranged in parallel in one direction, impregnated with a thermosetting resin, and forms a semi-cured prepreg sheet, The prepreg sheet is cut obliquely in the fiber direction or the width direction to prepare a prepreg sheet piece. Some of the prepreg sheet pieces are cut perpendicular to the fiber direction. This is because the number of prepreg sheet pieces to be wound around the portion to be reinforced is several tens of sheets, and a piece cut orthogonally is necessary for adjusting the internal state of the reinforcing layer.

  The length of the prepreg sheet piece is a length that can be wound once in the circumferential direction of the cylindrical metal core material. Thereby, since the direction of a fiber can be selected suitably for every layer of the fiber to wind, adjustment of the internal state of a reinforcement layer becomes easy.

  Many prepreg sheet pieces are parallelograms or rhombuses, and fibers are aligned in one direction. The angle of inclination of the parallelogram, that is, the direction of the fibers is inclined with respect to the longitudinal axis of the metal core material, but the reinforcement layer can be obtained by using one that is orthogonal to the axis or parallel to the axis. Configure.

  The fiber reinforced resin layer is formed by winding the prepreg sheet piece around the cylindrical portion of the metal core material in a single turn and laminating a large number of sheets, but the fiber direction when this prepreg sheet piece is laminated is They are slanted with each other to reinforce the surface. The obliquely intersecting fibers exhibit an effect of sufficiently exerting a resistance force that prevents the metal core material from being crushed by a high pressure acting from the outside.

  In addition, the crossing here has shown that the fiber direction of the laminated | stacked several prepreg sheet piece is not only one direction, and includes the case where the fiber direction of an adjacent layer is the same.

  Strengthened against external pressure (breakdown strength, especially buckling strength) is improved by integrally projecting a plurality of annular ridges on the outer peripheral surface of the cylindrical metal core material constituting the pressure vessel, Moreover, the thickness of the core material is reduced to reduce the weight, and further, the thermal conductivity is improved by the protrusions being in direct contact with seawater. Therefore, a pressure vessel for external pressure having high specific strength and excellent heat dissipation can be obtained.

  In addition, since the long fiber direction is substantially parallel to the inclination direction of the sheet piece, the long fiber is cut at the end portion, so that the long fiber is frayed from the end portion and the strength is prevented from being lowered. Further, fraying of the long fibers at the end portion is prevented, so that a difference in strength between the center portion and the end portion of the sheet piece does not occur, and variation in strength within the surface of the sheet piece is prevented. Moreover, since the long fiber directions of the adjacent sheet sides are oblique, the buckling property against the external pressure is remarkably improved as compared with the case where the long fiber direction is one direction.

  The protrusions improve the buckling resistance of the pressure vessel body and reduce the thickness of the body by reducing the thickness of the body, and the protrusions act as radiating fins, so the temperature in the pressure vessel rises. Thus, malfunction or failure of the device or device is prevented.

  Specific strength can be improved. That is, a light pressure vessel for external pressure having high buckling resistance and light weight can be obtained.

  In addition, since the weight can be reduced, expensive buoyancy materials can be reduced and the cost can be reduced.

  In addition, the reduced weight reduces the vehicle inertia and improves maneuverability. Thus, the thruster is of low power (low power consumption) and the battery consumption time is extended, and in particular, an AUV type vehicle can be searched for a long time.

  Hereinafter, an embodiment of a pressure vessel according to the present invention will be described with reference to the drawings.

  FIG. 2 is a schematic perspective view of the pressure vessel according to the present invention, FIG. 3 is a plan view, and FIGS. 4 and 5 are sectional views. As shown in FIGS. 2 to 5, the pressure vessel 1 has a plurality of annular protrusions 2 (ribs) formed integrally on the outer peripheral surface of the core material 1 a, and fibers on the outer peripheral surface of the core material. The reinforced resin layer 5 is integrally formed. The core material 1a is manufactured by machining or centrifugal casting.

  In this embodiment, a vehicle used in the deep sea of about 3,000 m to 6,000 m is assumed. Originally, aluminum alloy 7050, which is lightweight and excellent in corrosion resistance, is used, but is not limited thereto. For example, when used in the deep sea reaching 10,000 m, a titanium alloy having high strength and light weight is used.

  In this example, in order to show the manufacturing method and quality of a container composed of a composite material of fiber reinforced resin / aluminum alloy, a core material using aluminum alloy 2024-T4, which is easily available at a relatively low cost, is used. It is.

  The fiber reinforced resin layer 5 is configured so that the fiber direction of the prepreg sheet piece 4a is not limited to one direction so as to generate a resistance force that prevents the metal core material 1a from being crushed. It is formed as. That is, the fiber directions are crossed as a whole.

  The core material 1a has, for example, an inner diameter L3 of 100 mm, an outer diameter L4 of 112 mm, and an overall length L of 500 mm. As shown in FIG. 6, the thickness K1 is 6 mm, the height h1 of the protrusion 2 is 16 mm, and the thickness h2 Is 5 mm. As shown in FIG. 4, the interval between the protrusions 2 is 87.5 mm between the protrusions 2a located on both ends of the core material 1a and the rib 3, and the interval between the protrusions 2b positioned in the middle. Lb is 95 mm. When the core material 1a is the aluminum alloy 2024-T4 and is not strengthened by the fiber reinforced resin layer, the core material 1a is collapsed at a pressure of 300 atm (about 3000 m deep sea). The intervals are not strong. When it is reinforced with a fiber reinforced resin layer, the spacing is such that it does not collapse at 600 atmospheres (6,000 m deep sea). The weight of the core material 1a is 5.7 kg.

  In this embodiment, the sheet piece 4a spread on the core material 1a is a carbon fiber prepreg sheet as a material having high strength and relatively low cost and easy to obtain in order to show the manufacturing method and quality of the container as described above. Is used as an example, and a prepreg sheet selected from boron fibers or glass fibers can be used. Two or more kinds of carbon fibers, boron fibers, and glass fibers can be combined.

  In this example, Toray Industries, Inc. product number T300 / # 2580 was used as the carbon fiber prepreg sheet 4. As shown in FIG. 7, the prepreg sheet 4 has an outer peripheral length of the core material 1a (corresponding to the length L5 of the sheet piece 4a) and a distance La or Lb between the protrusions 2 (corresponding to a width L6 of the sheet piece 4a). Then, the long fiber direction is further cut out to be 0 °, 90 °, + 45 ° (angle α), and −45 ° (angle β) (FIG. B). In this way, a necessary amount of sheet pieces 4a is formed.

  The fiber reinforced resin layer 5 covering the core material 1a is laminated and formed so that the long fiber direction of the sheet piece 4a is at an angle θ shown in Table 1 (from the first layer to the 38th layer). . As shown in Table 1, from the first layer to the 22nd layer, the sheet pieces 4a whose fiber direction is + 45 ° (angle α) and the sheet pieces 4a whose −45 ° (angle β) are alternately laminated. In the 23rd and subsequent layers, sheet pieces 4a whose fiber directions are 0 °, 45 °, 90 °, −45 °... 0 ° are laminated. As shown in Table 1, in this embodiment, the sheet pieces 4a having the same fiber direction, such as a sheet piece 4a having a fiber direction of −45 ° and a sheet piece 4a having a fiber direction of 0 °, are continuously laminated. However, the fiber directions are crossed as a whole, and are laminated so as to exert a resistance force against the crushing of the core material by an external force. The sheet piece 4a has a thickness of about 0.2 mm, and the fiber reinforced resin layer 5 has a thickness K2 of about 7 mm (FIG. 6).

  In addition, the end plate (not shown) attached to the flange 3 formed at both ends of the core material 1a is made of metal (made of aluminum alloy 2024-T4) in consideration of heat diffusion, conductor hole production, and the like. Yes. The pressure container 1 thus formed has a weight of 7.75 kg.

  Next, the manufacturing method of the pressure-resistant container 1 of a present Example is demonstrated.

  FIG. 1 is a schematic diagram of a pressure vessel manufacturing apparatus 30. As shown in FIG. 1, a large number of sheet pieces 4a are sandwiched between a mount 31 and a release paper 32, and the mount 31 and the sheet pieces 4a. And a strip f formed of the release paper 32 is wound around the roller R1. The mount 31 is wound from the roller R1 to the take-up roller R2, and the release paper 32 is taken up by the take-up roller R5.

  The core material 1a is pivotally supported by a rotating device (not shown) and is rotated in accordance with the movement of the mount 31. Further, a presser P for pressing and spreading the prepreg sheet piece 4a on the mount 31 against the core material 1a is provided below the core material 1a.

  The long fiber direction of the sheet piece 4a is arranged on the mount 31 so as to be 0 °, 90 °, plus 45 ° (angle α), and minus 45 ° (angle β) with respect to the axial direction of the core material 1. Yes. Further, an interval L10 is provided so that the end portion m (FIG. 7C) of the spread sheet piece 4a is shifted by about 90 ° on the circumference of the core material 1a. Further, the rotating device is provided with an axial feed mechanism, and when a predetermined number of sheet pieces 4a are spread, the sheet pieces 4a are successively spread on a portion where the sheet pieces 4a are not yet spread. It comes to wear.

  Further, each time the prepreg sheet piece 4a is wound around the core material 1a, the prepreg sheet piece 4a is spread while being pressed by the pressing device P, and the surface of the sheet piece 4a is smoothened and the air is released. Such spreading operation is sequentially performed, and the fiber reinforced resin layer 5 is formed on the outer periphery of the core material 1a.

  The core material 1a on which the fiber reinforced resin layer 5 is formed is removed from the rotating device, and a release sheet 6 (FIG. 2C) made of polytetrafluoroethylene is wound around the outer periphery of the fiber reinforced resin layer 5. Further, a 0.3 mm thick stainless steel sheet 7 (FIG. 2D) with a release sheet 7 a attached inside is wound around the outer periphery. The stainless sheet 7 is formed to be approximately 30 mm longer than the outer periphery of the fiber reinforced resin layer 5 when wound around the core material 1a. Moreover, the width | variety of the stainless sheet 7 and the space | interval La and Lb of the protrusions 2 are the space | interval within 0.2 mm.

  Further, a cover 9 (FIG. 2B) made of an aluminum alloy (for example, 2024-T4) formed in a quarter arc shape on the outer periphery of the fiber reinforced resin layer 5 is pressed against the fiber reinforced resin layer 5. To fit (FIG. 8). Next, the entire cover 9 is covered with a vacuum bag (not shown), and the bag is evacuated using a vacuum pump.

  While maintaining the vacuum state, the thermosetting resin (matrix resin) is cured by heating and pressing (for example, about 130 ° C., about 3 atm) in an autoclave. However, the vacuum state in the vacuum bag is released at the same time as pressure is applied in the autoclave.

  The thickness of the cover 9 is such that the height of the outer peripheral surface of the cover 9 after the cover 9 is fitted into the core material 1a is equal to the height h1 of the protrusion 2 or about ± 1 mm. Is formed. The reason why the height of the outer peripheral surface of the cover 9 is equal to the height h1 of the protrusion 2 is to prevent the vacuum bag from being damaged by surface irregularities when evacuating with the vacuum bag.

  The pressure vessel 1 for external pressure thus produced is cut parallel to the axial direction, and the laminated state of the fiber reinforced resin layer 5 (CFRP) and the bonding boundary between the CFRP and the core material 1a are observed, and the cavity And no defects such as peeling.

  Although the manufacturing method in the case of mass production has been described in the first embodiment, an example in the case of producing a pressure vessel by manual work such as in the case of a custom-made product or a small amount production will be described.

(Spreading process)
As shown in FIG. 7, the circumference of the core material 1a is such that the direction of the long fiber of the prepreg sheet 4 of CFRP (GFRP or BFRP can also be used) is a predetermined angle (0 °, ± 45 °, 90 °). Cut according to the length and the spacing between the ridges La and Lb. In the sheet piece 4a thus obtained, the prepreg sheet 4 is cut so as to have an angle shown in Table 1, and the first layer to the 38th layer are formed. Further, the sheet piece 4a has a length L5 in which both end portions m do not overlap when wound around the core material 1a, and a slight gap L2 is formed as shown in FIG. This is to prevent a step from occurring due to the overlapping of both end portions m (end surfaces) of one sheet piece 4a, and to prevent the concentration of external pressure stress in the sea from occurring at this step portion.

  The gap L2 extends from about 0.1 mm to about 1 mm from the first layer to the 38th layer (outermost surface layer). This is because the shrinkage of the thermoplastic resin in the thermoforming process is larger on the outer side, so that both end portions m (end surfaces) around which the sheet pieces 4a are wound do not overlap or cause a gap.

  Therefore, the above-mentioned gap L2 is adjusted according to molding conditions and the like, and an optimal interval is appropriately provided, and is not limited to the above. Further, the base portion of the protrusion 2 projecting from the core material 1a has an arcuate shape R, and the sheet piece spread in the vicinity of the core material 1a has a slight sheet width corresponding to the shape R. It is adjusted to.

  In the heating process for curing the resin, in order to reduce molding defects and thermal residual stress due to the difference in thermal expansion between the metal core material 1a and the CFRP, the sheet piece 4a is provided with a predetermined tension. It is wound around the material 1a. This is because in the thermoforming process described later, the laminated prepreg sheet pieces 4a are thermally expanded to cause sag, and the fiber reinforced resin layer 5 may be uneven.

  Next, oil and dirt on the surface of the core material 1a are degreased and removed with a solvent such as acetone, and the sheet pieces 4a are sequentially spread and laminated on the core material 1a according to the stacking order shown in Table 1. The end m is shifted about 90 to 180 ° in the circumferential direction of the core material so that the seams (end faces) of the layers do not overlap.

  Specifically, when the core material axis direction is set to 0 °, the sheet pieces 4a having a carbon fiber direction of ± 45 ° that is strong against the in-plane shear force are stacked in the immediate vicinity of the core material. The sheet pieces 4a of 0 °, 45 °, 90 °, and −45 °, which are strong against the axial buckling and circumferential buckling of the core material 1a, are spread thereon.

  The ± 45 ° sheet pieces 4a are laminated so as to be 1/2 to 2/3 of the thickness K2 of the fiber reinforced resin layer 5, and the thickness of the fiber reinforced resin layer 5 is K2 is 1.2 to 1.5 times the wall thickness K1 of the core material 1a. Furthermore, the height h1 of the protrusion 2 is about 1.2 times the combined thickness of the metal core 1a and the fiber reinforced resin layer 5.

(Air bleeding process)
The air venting process is performed in two steps when the respective layers of the prepreg sheet pieces 4a are wound and when a predetermined number of sheets have been laminated, as in the above-described automatic production method.

  In this embodiment, the air is removed while the surface of the wound prepreg sheet piece 4a is pressed and smoothed by a plate material or a manufacturer's hand. Then, a polytetrafluoroethylene release sheet 6 is wound around the fiber reinforced resin layer 5 formed by laminating a predetermined number of sheets, and a polytetrafluoroethylene release sheet 7a is stuck on the inside thereof. . A stainless steel sheet 7 having a thickness of 3 mm is wound. The stainless sheet 7 is formed to have a length that is approximately 30 mm longer than the outer periphery of the fiber reinforced resin layer 5. Further, the width of the stainless sheet 7 and the interval between the protrusions 2 are set to be a gap of 0.2 mm or less. Subsequently, an aluminum alloy 2024-T4 cover 9 formed into a quarter arc shape of the outer periphery of the fiber reinforced resin layer 5 is fitted. Finally, with the cover 9 fitted, the whole is covered with a vacuum bag, and the inside of the bag is evacuated with a vacuum pump.

(Heat forming process)
While maintaining the vacuum state, the fiber reinforced resin layer 5 is cured by heating and pressurizing to 130 ° C. and 3 atm in an autoclave. However, the vacuum state in the vacuum bag is released at the same time as pressure is applied in the autoclave. The thickness of the cover 9 used at this time is such that the height of the outer peripheral surface of the cover 9 is equal to the height of the protrusion 2 or ± 1 mm in a state where the cover 9 is fitted into the core material 1a. Is formed. The reason why the height of the outer peripheral surface of the cover 9 is equal to the height h1 of the protrusion 2 is to prevent the vacuum bag from being damaged by surface irregularities when evacuating with the vacuum bag.

  In order to examine the internal quality of the pressure vessel for external pressure manufactured as described above, the cylindrical main body of the pressure vessel is cut and the CFRP laminated state and the bonding boundary between the CFRP and the core material 1a are observed, such as cavities and peeling. I did not find any flaws.

  In this example, a pressure resistant container is manufactured by the same manufacturing method using a core material manufactured by the aluminum alloy 2024-T4 having the same shape as that of Example 1 or Example 2. As a difference, in this embodiment, TR50S / # 350 manufactured by Mitsubishi Rayon Co., Ltd. is used as CFRP. The mechanical properties of Toray's T300 / # 2580 and Mitsubishi Rayon's TR50S / # 350 used in Example 1 or Example 2 are almost the same.

  The pressure vessel manufactured by the same manufacturing method as in Example 1 or Example 2 well exceeded the pressure (600 atm) assumed in actual use in the pressure test described later, and the crushing pressure was 700 atm. It was. Furthermore, although the crushing location of the pressure vessel after the test and the entire vessel, particularly the boundary between the side surface of the ridge and the CFRP, were observed, no peeling or breakage was found in locations other than the crushing location.

  Moreover, in the said Example 1 or 2, the carbon fiber prepreg which has high intensity | strength and high rigidity is used in view of cost and specific strength comprehensively. Therefore, it is possible to use a boron fiber prepreg which is expensive but strongest to buckling. Moreover, when giving priority to cost, a high-strength glass fiber prepreg can be used. Furthermore, these three kinds of prepregs can be hybridized as necessary. When it is necessary to comprehensively consider the cost and specific strength, it is desirable to use a carbon fiber prepreg having high strength and high rigidity as in this embodiment. In Examples 1 and 2, Toray Corp.'s T300 / # 2580 and Mitsubishi Rayon Corp.'s TR50S / # 350 were exemplified as CFRP, but of course not limited to these. It is appropriately changed according to strength and application (depth used).

  As described in Examples 1 to 3 above, the fiber reinforced resin layer in the pressure vessel according to the present invention is laminated by substantially crossing the fiber directions of the prepreg sheet pieces to form a mesh arrangement as a whole, and the metal It is characterized by having a function of generating a strength to prevent the core material from being crushed.

  Further, the prepreg sheet pieces constituting the reinforcing fiber resin layer are characterized in that they are wound and laminated so that the end faces do not overlap. As a result, a slight protrusion is formed at the overlapping portion of the end faces of the prepreg sheet pieces, so that the external force is not concentrated on the protrusion and the core material is not crushed.

  Furthermore, the reinforcing fiber resin layer formed by laminating a plurality of prepreg sheet pieces is characterized in that it is dispersed and laminated in the circumferential direction of the core material so that the end faces of the prepreg sheet pieces do not overlap. This prevents the strength of the reinforcing fiber resin layer from being lowered by overlapping the positions of the end faces of the plurality of prepreg sheet pieces.

[Pressure resistance test]
Next, a pressure resistance test was performed on the hybrid pressure container of the present invention, which will be described below.

(Pressure vessel for external pressure according to the present invention)
A strain gauge was attached to the inside of the pressure vessel of Example 3 and a pressure test was performed using a hydrostatic pressure tester. The pressure resistance test was performed under the condition that pressurization was performed at a speed of 50 kgf / cm ² / min and the pressure was maintained for 5 minutes every increase of 50 kg / cm ² .

The pressure resistance of the CFRP / metal hybrid pressure container in Example 3 obtained by this pressure resistance test was 7.2 kgf / mm ² . From the container weight of 7.75 kg, the specific strength of the pressure vessel was 0.93.

(Comparative example)
A pressure resistance test was performed on the container (core material 1a) made of aluminum alloy 2024-T4. The test conditions were the same as the pressure test described above, and the pressure resistance of the container was 3.4 kgf / mm ² . Since the weight of the container was 5.7 kg, the specific strength was 0.6.

  Therefore, the pressure vessel for external pressure according to the present invention was found to have a specific strength about 55% higher than that of the aluminum alloy vessel.

  The core material type FRP / metal hybrid pressure resistant container with a plurality of protrusions using the fiber reinforced plastic prepreg according to the present invention provides a pressure container having a plurality of protrusions having high specific strength and excellent heat dissipation. be able to. In particular, a pressure vessel suitable for a deep sea research machine can be provided. Since the pressure vessel according to the present invention has a higher specific strength than conventional metal ones, the weight of the vehicle can be reduced, long-time exploration is possible by reducing energy consumption, and maneuverability as a vehicle is improved. Improvement is also achieved.

It is the schematic of the manufacturing apparatus of the pressure vessel which concerns on this invention. It is the schematic of the pressure vessel which concerns on this invention. It is a side view of the pressure vessel which concerns on this invention. It is CC sectional view taken on the line of the pressure vessel which concerns on this invention. It is AA arrow sectional drawing of the pressure vessel which concerns on this invention. (A) is a BB arrow sectional drawing of the pressure vessel which concerns on this invention, (B) is the elements on larger scale of a core material. It is a figure which shows a prepreg sheet and a sheet piece. (A) is a prepreg sheet, (B) is a sheet piece, and (C) is a wound state. It is sectional drawing during shaping | molding of the pressure vessel which concerns on this invention. (A) is a schematic partial sectional view of AUV type, and (B) is a schematic view of ROV type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure-resistant container 1a Core material 2 Projection body 4 Pre-preg sheet 4a Sheet piece 5 FRP layer 6 Teflon (registered trademark) sheet 7 Stainless sheet 9 Press member M Motor C1, C2 Vehicle

Claims (3)

A fiber reinforced resin layer is integrally formed on the outer peripheral surface of a cylindrical metal core material whose openings at both ends are closed by end plates, and a plurality of outer peripheral surfaces of the core material are arranged at predetermined intervals in the axial direction of the core material. An annular ridge body is integrally formed,
The fiber reinforced resin layer has a long fiber aligned in one direction and is impregnated with a thermosetting resin, and uses a semi-cured prepreg sheet,
Cutting the prepreg sheet into a length that covers one round of the cylindrical outer peripheral surface of the core material to form a prepreg sheet piece,
The prepreg sheet piece is inclined or orthogonally cut with respect to the fiber length direction, and when the sheet piece is wound around the outer peripheral surface of the core material and laminated, the lower sheet piece and the upper layer The pressure direction container for external pressure is characterized in that the fiber directions of the sheet pieces are laminated so as to cross each other. The core material is formed of a light metal alloy such as a titanium alloy or an aluminum alloy,
The long fiber of the sheet piece constituting the fiber reinforced resin layer is composed of at least two kinds of fibers selected from carbon fiber, boron fiber, glass fiber, or carbon fiber, boron fiber, and glass fiber. The pressure vessel for external pressure according to 1.   3. The pressure vessel for external pressure according to claim 1 or 2, wherein the pressure vessel is a pressure vessel for accommodating electronic equipment such as observation equipment for deep sea exploration vehicles.

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