JP2016188669A - Pressure-resistant container and engagement structure of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-resistant container that is prevented from dislodge from a shaft holder of a device even it has thin thickness.SOLUTION: A pressure-resistant container 20 includes: a body 20a; a projection 26 provided at least one of both ends in an axial direction of the body 20a and formed in a hollow tapered shape; and a pair of claws 27A, 27B fixedly provided at a tip 26a of the projection 26 and extending toward a base end part 26c of the projection 26 that is provided in the pressure-resistant container 20. The pair of claws 27A, 27B is capable of elastically deformable on a side of coming close to a lateral face 26b of the projection 26.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pressure vessel and an engagement structure thereof.

  Conventionally, various techniques have been proposed for pressure vessels (see, for example, Patent Document 1).

  Patent Document 1 discloses a pressure vessel in which a base is insert-molded at an end portion in the axial direction of a liner constituent member, the liner constituent member and the base are joined by a composite layer, and a region where the base is exposed is eliminated. Patent Document 2 discloses a storage tank in which a communication boss is formed at an end portion of the inner liner in the axial direction.

  By the way, the pressure vessel may be supported by various devices (for example, a device that winds a filament around the pressure vessel) in a posture in which the axial direction is in the horizontal direction and floats from the ground. In such a case, both ends of the pressure vessel in the axial direction are generally supported by the apparatus, and if there is a mouth (such as a base in Patent Document 1) at the end of the pressure vessel, the mouth Is used to pivotally support the end of the pressure vessel on the device.

  On the other hand, it is conceivable to provide a projection at the end portion at the end portion without the mouth portion, and to support the projection on the shaft presser. However, in this case, if the pressure vessel is formed thin from the viewpoint of improving lightness, the strength of the projections is reduced, and the projections may be deformed and fall off the shaft holder.

JP 2014-052030 A Special table 2011-525864 gazette

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pressure-resistant container that does not fall off the shaft retainer of the apparatus even if it is thin, and its engagement structure.

The present invention is grasped by the following composition.
(1) A first aspect according to the present invention is a pressure vessel, which is fixedly provided on a main body, a protrusion provided on at least one of axial ends of the main body, and a tip portion of the protrusion. And a pair of claws extending toward the base end portion.

(2) In the configuration of (1), the pair of claws may have elasticity.

(3) In the configuration of (1) or (2) above, the pair of claws may have a thin skin portion between side surfaces of the protrusions.

(4) In the configuration of (1) or (2), the pair of claws may extend away from the side surface of the protrusion.

(5) In any one of the constitutions (1) to (4), the main body and the protrusion may be formed by blow molding, and the pair of claws may be integrally formed with them.

(6) A second aspect according to the present invention is an engagement structure between a pressure vessel and a device that pivotally supports the pressure vessel, and the pressure vessel is attached to at least one of the main body and both axial ends of the main body. A shaft retainer having an opening for receiving the protrusion, and a protrusion provided and a pair of claws fixedly provided at a distal end portion of the protrusion and extending toward the proximal end portion And when the said protrusion is received, the said shaft clamp which has the convex part which can engage with a pair of said nail | claw in the inner side vicinity of the said opening is characterized by the above-mentioned.

(7) In the configuration of (6), the shaft presser may have a pair of windows on its side surface for pressing the pair of claws from the outside to release the engagement.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is thin, the pressure | voltage resistant container which does not fall off from the shaft holder of an apparatus, and its engaging structure can be provided.

It is a longitudinal cross-sectional view of the container made from FRP which concerns on embodiment of this invention. It is a figure which shows the structure of the protrusion periphery which concerns on embodiment, and is a figure which fractures | ruptures and shows a part. It is the sectional view on the AA line of FIG. It is a figure explaining the molding die concerning the embodiment, and a molding method, and is a figure showing the state where the molding die was opened. It is a figure explaining the molding die concerning the embodiment, and a molding method, and is a figure showing the state where a molding die was clamped. It is a figure explaining the filament winding apparatus and filament winding method which concern on embodiment, (a) is the figure seen from the axial direction of the pressure vessel, (b) is the figure seen from the axis orthogonal direction of the pressure vessel. . It is a figure which expands and shows the engagement structure which concerns on embodiment.

(Embodiment)
Hereinafter, a first embodiment (hereinafter referred to as an embodiment) for carrying out the present invention will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment. The drawings are viewed in the direction of the reference numerals.

(Overall configuration of FRP container)
First, the overall configuration of a FRP (Fiber Reinforced Plastics) container according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, an FRP container 10 is formed of a synthetic resin and is a cylindrical pressure-resistant container (also referred to as a liner) 20 that stores a fluid 11 and a fiber-reinforced resin that covers an outer peripheral surface of the pressure-resistant container 20 For example, in a hot water heater using heat pump technology, the layer 30 is used as a hot water tank for storing the fluid 11 that is hot water. When the external dimensions of the FRP container 10 are exemplified, the length L is 1600 mm and the trunk diameter D is 400 mm.

  The main body 20 a of the pressure vessel 20 includes a substantially cylindrical body 21, a hemispherical upper hemisphere 22 that covers the upper side of the body 21 in the axial direction, and a hemispherical that closes the bottom of the body 21 in the axial direction. The bottom hemisphere portion 23 is integrally formed. The main body 20a is molded with a predetermined thickness (for example, about 3 mm) by hollow molding. The upper hemisphere portion 22 is formed with a plurality of (in this case, a total of four) mouth portions 25 for allowing the fluid 11 to flow in or out, and each mouth portion 25 is formed from the vicinity of the central portion of the upper hemisphere portion 22. It is provided so as to protrude in parallel with the axial direction of the body portion 21. Although various synthetic resins can be used for the molding material of the pressure vessel 20, materials having excellent heat resistance (for example, polybutene resin) are suitable.

  The pressure vessel 20 has a protrusion 26 provided on at least one of the axial ends of the main body 20a (in this example, the lower end of the bottom hemispherical portion 23) and a tip end (lower end) 26a of the protrusion 26. A pair of fixed claws (first claws 27A and second claws 27B). Although the detailed molding method of the pressure vessel 20 will be described later, the main body 20a and the protrusion 26 are molded by blow molding, and the first and second claws 27A and 27B are molded integrally with them.

  The fiber reinforced resin layer 30 is configured by a yarn 31 (see FIG. 6) wound around the outer peripheral surface of the pressure resistant container 20. The yarn 31 has a flat cross section, and is a bundle of filaments 32 (see FIG. 6) such as carbon fiber, glass fiber, and metal fiber. The fiber reinforced resin layer 30 covers substantially the entire outer peripheral surface of the pressure vessel 20. However, since it is difficult to wind the yarn 31 (see FIG. 6) around the center of the upper hemisphere 22 and around the center of the bottom hemisphere 23, the metal plate 12 (in this example, on the upper hemisphere 22 side). The metal plate provided may be reinforced).

  A plurality of temperature sensors 40 for detecting the temperature of the fluid 11 are attached to a predetermined position of the pressure-resistant container 20 within the region where the fiber reinforced resin layer 30 is formed via a blind nut 51 or the like. Can do.

(Projection, first and second nail configuration)
Next, the configuration of the protrusion 26 and the first and second claws 27A and 27B will be described with reference to FIGS.

  As shown in FIG. 2, the protrusion 26 is provided so as to protrude downward from the lower end of the bottom hemispherical portion 23, and is formed in a tapered shape that tapers toward the distal end portion 26 a. The first and second claws 27A and 27B extend from the distal end portion 26a of the protrusion 26 toward the proximal end portion 26c. Between the first and second claws 27A, 27B and the protrusion 26, there are a first thin skin portion 28A and a second thin skin portion 28B (thin resin crushed by a dividing surface of a molding die 70 described later). It is formed. The first and second claws 27 </ b> A and 27 </ b> B have elasticity and can be elastically deformed to the side approaching the side surface 26 b of the protrusion 26.

  Here, an example is shown in which the first and second thin skin portions 28A and 28B that connect between the first and second claws 27A and 27B and the side surface 26b of the projection portion 26 are formed. The second thin skin portion 28A, 28B is provided with a cut in the extending direction. Furthermore, depending on the thickness and material of the first and second claws 27A, 27B, the first and second thin skin portions 28A, 28B may not be molded.

  As shown in FIG. 3, the protrusion 26 is a portion that is hollow-molded, and the first and second claws 27A and 27B are portions that are compression-molded. The protrusion 26, the first and second claws 27A and 27B, and the first and second thin skin portions 28A and 28B are arranged side by side on the parting line PL (on the divided surface of the molding die 70 described later). .

(Molding mold and molding method)
Next, a molding die and a molding method for molding the pressure vessel 20 will be described with reference to FIGS.

  As shown in FIG. 4, the molding die 70 is a split-type die, and includes a first die 71 and a second die 72 that fits the first die 71. Each of the first and second molds 71 and 72 is provided with projection forming surfaces 71a and 72a, claw forming surfaces 71b and 72b, and thin skin forming surfaces 71c and 72c. In addition, pinch-off portions 71d and 72d are formed outside the nail molding surfaces 71b and 72b so as to surround the nail molding surfaces 71b and 72b.

  The molding method includes the following steps (A1) to (A4). First, in step (A1), a molding die 70 is prepared. Next, in step (A2), as shown in FIG. 4, between the first and second molds 71 and 72, a molten cylindrical parison 73 made of thermoplastic resin is extruded and suspended. Thereafter, the first and second molds 71 and 72 are closed and clamped so that the pinch-off portions 71d and 72d are brought into contact with each other.

  As shown in FIG. 5, in step (A3), compressed air is blown into the parison 73, the parison 73 is expanded, the pressure-resistant container 20 is formed, and cooled to a predetermined temperature. At this time, the parison 73 swells along the projection forming surfaces 71a and 72a, and the projection 26 is hollow-molded. A part of the parison 73 is sandwiched between the claw forming surfaces 71b and 72b, and the first and second claws 27A, 27B is compression-molded, and the first and second thin skin portions 28A and 28B are formed by sandwiching a part of the parison 73 between the thin skin molding surfaces 71c and 72c. The first and second claws 27A, 27B having appropriate thicknesses are set by appropriately setting the gaps between the nail molding surfaces 71b, 72b and the thin skin molding surfaces 71c, 72c in the clamped state. The first and second thin skin portions 28A and 28B having appropriate thicknesses can be formed.

  In step (A4), the first and second molds 71 and 72 are opened, and the protrusion 26, the first and second claws 27A and 27B, and the first and second thin skin portions 28A and 28B are integrated. The pressure vessel 20 that has been molded is removed from the molding die 70 and conveyed to the next step.

(Filament winding device and filament winding method)
Next, a filament winding device 80 and a filament winding method for winding the filament 32 around the pressure vessel 20 will be described with reference to FIGS.

  As shown in FIGS. 6A and 6B, the filament winding apparatus 80 supports the end portion on the upper hemispherical portion 22 side of the pressure vessel 20 with the body portion 21 in the horizontal direction so as to be rotatable. An upper shaft presser 81 and a bottom shaft presser 82 that rotatably supports the end portion on the bottom hemispherical portion 23 side. In addition, the filament winding device 80 includes a guide 83 that guides the yarn 31 fed out from a bobbin (not shown) to the pressure vessel 20. The guide 83 can operate in the left-right direction (the axial direction of the body portion 21) and the front-back direction (the direction perpendicular to the axis of the body portion 21) with respect to the rotating pressure vessel 20.

  As shown in FIG. 7, the bottom-side shaft presser 82 is provided in a ring shape near the inside of the opening 86, a cylindrical shaft presser main body 85, an opening 86 that opens at the end of the shaft presser main body 85 and receives a protrusion. And a convex portion 87. Further, the shaft presser main body 85 has a pair of window parts (a first window part 88A and a second window part 88B) on the side face 26b.

  In this engagement structure 90, when the projection 26 and the first and second claws 27A and 27B are received in the opening 86, the first and second claws 27A and 27B can be engaged with the convex portion 87. More specifically, first, the protrusion 26 and the first and second claws 27A and 27B are inserted into the opening 86 while the first and second claws 27A and 27B are elastically deformed toward the side surface 26b (arrows). (1)). And if 1st, 2nd nail | claw 27A, 27B gets over convex part 87, 2nd nail | claw 27A, 27B will be restored | restored outward (arrow (2)), and the edge part of 2nd nail | claw 27A, 27B Is locked to the convex portion 87.

  On the other hand, when the first and second claws 27A and 27B are pulled out from the bottom shaft retainer 82, the first and second claws 27A and 27B are externally attached with a tool or the like through the first and second window portions 88A and 88B. The first and second claws 27A and 27B are elastically deformed toward the side surface 26b. Thus, after the engagement between the first and second claws 27A and 27B and the convex portion 87 is released, the protrusion 26 and the first and second claws 27A and 27B are pulled out from the opening 86.

  Here, as the first and second thin skin portions 28A and 28B are thicker, the force and engagement necessary to receive (push in) the projection 26 and the first and second claws 27A and 27B into the opening 86 are released. The power to do is increased. Further, the thicker the first and second thin skin portions 28A and 28B, the more the first and second claws 27A and 27B after the projection 26 and the first and second claws 27A and 27B are received in the opening 86. Since the restoring force increases, the holding force of the convex portion 87 that holds the first and second claws 27A and 27B increases. Accordingly, by adjusting the thickness t (see FIG. 3) of the first and second thin skin portions 28A and 28B to an appropriate size, the protrusion 26 and the first and second claws 27A and 27B can be moved with an appropriate force. In addition to being able to be pushed into and released from the opening 86, the engagement state between the first and second claws 27A and 27B and the convex portion 87 after being pushed in can be stabilized.

  Further, depending on the function required for the engagement structure 90, the first and second thin skin portions 28A and 28B are formed to be as thin as the burr formed by the pinch-off portions 71d and 72d (see FIG. 5). Alternatively, the first and second thin skin portions 28A and 28B may be provided with cuts. Further, depending on the thickness and material of the first and second claws 27A and 27B, the first and second thin skin portions 28A and 28B are formed between the first and second claws 27A and 27B and the protrusion 26. Instead, the first and second claws 27 </ b> A and 27 </ b> B may be extended to positions separated from the side surface 26 b of the protrusion 26.

  The filament winding method includes the following steps (B1) to (B4). First, in step (B1), a filament winding device 80 is prepared. Next, in step (B2), as shown in FIGS. 6A and 6B, the upper hemisphere portion 22 side of the pressure vessel 20 is supported by the upper shaft presser 81, and the bottom hemisphere portion 23 side is the bottom side. The shaft holder 82 is supported. In the bottom-side shaft presser 82, the first and second claws 27A and 27B are elastically deformed, and the projection 26 and the first and second claws 27A and 27B are pushed into the opening 86, thereby the first and second claws. 27A and 27B are engaged with the convex portion 87. When the blind nut 51 (see FIG. 1) is pre-assembled into the pressure vessel 20 by insert molding, a bypassing treatment for bypassing the yarn 31 to be wound around the blind nut 51 to the surroundings as necessary. The tool 60 is screwed into the pressure vessel 20.

  In step (B3), the yarn 31 is automatically wound around the pressure vessel 20 by controlling the operation of the guide 83 while rotating the pressure vessel 20 around the axis X of the trunk portion 21. At this time, in the bottom hemispherical portion 23, the yarn 31 is wound as far as possible to the base end portion 26 c of the protrusion 26. For winding the yarn 31, for example, helical winding or a combination of hoop winding and helical winding is used. Helical winding is a method of winding the yarn 31 spirally along the axis X of the body portion 21, and hoop winding is a method of winding the yarn 31 substantially perpendicular to the axial direction of the body portion 21. In helical winding, the spiral direction (the direction indicated by the solid line arrow (3)) when winding from one side in the axial direction of the body portion 21 to the other side and the winding direction from the other side in the axial direction of the body portion 21 to one side. And the spiral direction (the direction indicated by the dashed arrow (4)) intersect each other.

  In step (B3), a known filament winding method (also referred to as FW method) can be used. Known filament winding methods include a wet method (wet filament winding method) in which a filament is impregnated with a thermosetting resin and a filament (prepreg) impregnated with a thermosetting resin in advance. There is a dry method (dry filament winding method) that is wound around a wire.

  In step (B4), the pressure resistant container 20 (FRP container 10) in which the winding of the yarn 31 is completed is removed from the upper shaft presser 81. Further, the first and second claws 27A and 27B are pressed from the outside with a tool or the like through the first and second window portions 88A and 88B, and the first and second claws 27A and 27B and the projection 87 are engaged. The joint 26 is released, and the projection 26 and the first and second claws 27A and 27B are pulled out from the bottom side shaft retainer 82 and removed.

(Effect of embodiment)
The effects of the embodiment described above will be described. According to this embodiment, the protrusion 26 and the first and second claws 27A and 27B can be firmly engaged with and supported by the bottom-side shaft presser 82. Thereby, even if it is a case where the pressure-resistant container 20 is shape | molded thinly considering lightness, the drop-off | omission of the protrusion 26 from the bottom side shaft retainer 82 can be prevented.

  Further, by pressing the first and second claws 27A and 27B from the outside with a tool or the like through the first and second window portions 88A and 88B, the protrusion 26 and the first and second protrusions from the bottom shaft presser 82 are provided. The claws 27A and 27B can be easily removed.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  For example, in the embodiment, the filament winding device is exemplified as a device for pivotally supporting the pressure vessel, but the device for pivotally supporting the pressure vessel is in a state where both ends in the axial direction of the main body of the pressure vessel are pivotally supported. A device for storing the pressure vessel, a device for transporting the pressure vessel, a device for performing a surface treatment on the pressure vessel, and the like are included.

DESCRIPTION OF SYMBOLS 20 ... Pressure-resistant container, 20a ... Main body, 26 ... Protrusion, 26a ... Tip part, 26b ... Side face, 26c ... Base end part, 27A ... 1st nail | claw (a pair of nail | claw), 27B ... 2nd nail | claw (a pair of nail | claw) ), 80 ... Filament winding device (apparatus), 82 ... Bottom side shaft retainer, 86 ... Opening, 87 ... Projection, 88A ... First window (window), 88B ... Second window (window) ), 90 ... engagement structure

Claims (7)

A pressure vessel,
The body,
Protrusions provided on at least one of the axial ends of the main body;
A pressure-resistant container comprising: a pair of claws fixedly provided at a distal end portion of the protrusion and extending toward a proximal end portion thereof.   The pressure-resistant container according to claim 1, wherein the pair of claws have elasticity.   The pressure-resistant container according to claim 1 or 2, wherein the pair of claws have a thin skin portion between side surfaces of the protrusions.   The pressure vessel according to claim 1 or 2, wherein the pair of claws extend away from a side surface of the protrusion.   5. The pressure vessel according to claim 1, wherein the main body and the protrusion are formed by blow molding, and the pair of claws are integrally formed with them. It is an engagement structure between a pressure vessel and a device that supports it,
The pressure vessel is provided with a main body, a protrusion provided on at least one of both ends in the axial direction of the main body, and a pair of claws that are fixedly provided at a distal end portion of the protrusion and extend toward the base end portion And comprising
The device includes a shaft retainer having an opening for receiving the protrusion, and having a protrusion in the vicinity of the inside of the opening that can be engaged with the pair of claws when the protrusion is received. An engagement structure characterized by that.   The engagement structure according to claim 6, wherein the shaft presser has a pair of windows on its side surface for releasing the engagement by pressing the pair of claws from the outside.

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