JP2013160344A - Flange joint, and method for manufacturing cylindrical body for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange joint having sufficient strength that can withstand high pressure, and a method for manufacturing a cylindrical body suitably used for such a flange joint.SOLUTION: A flange joint 11 includes a cylindrical body 12 made of glass fiber reinforced resin and integrally provided with a flange 13 with a triangular cross section, and a disk body 14 made of glass fiber reinforced resin, formed in trapezoidal cross-sectional shape and combined with the flange 13 integral with the cylindrical body 12 to form a flange part 11b of square cross section. The disk body 14 is provided with a plurality of bolt insertion through-holes 15.

Description

  The present invention relates to a flange joint and a method of manufacturing a flange joint cylindrical body, and more particularly, for use in bonding a multilayer pipe composed of a hard polyvinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin (FRP) layer. And a method of manufacturing a cylindrical body suitable for use in such a flange joint.

  It is known that a filling type adhesive is used for bonding a multilayer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer (Patent Document 1).

  In the bonding of Patent Document 1, when the glass fiber reinforced resin tube is peeled off from the multilayer tube, a saw is used with care not to cut between the hard vinyl chloride in the glass fiber reinforced resin layer in the multilayer tube. A complicated work process is required, for example, after cutting with a burner or the like and heating the portion to be peeled off with a burner or the like, and then peeling off the glass fiber reinforced resin layer with pliers or the like. In particular, in a multi-layer pipe used as a high-pressure pipe, the glass fiber reinforced resin layer is provided with a very large thickness, which makes the stripping operation more difficult.

JP 2003-207087 A

  A flange joint structure is known as a joint that does not require the stripping process of the glass fiber reinforced resin layer. However, the flange joint used for joining the multilayer pipes has sufficient strength to withstand high pressure. Such flange joints have not been known in the past.

  An object of the present invention is to provide a flange joint having sufficient strength capable of withstanding high pressure and a method of manufacturing a cylindrical body suitable for use in such a flange joint.

  A flange joint according to the present invention is a flange joint comprising a cylindrical portion and a flange portion having a square cross section, and a cylindrical body made of glass fiber reinforced resin integrally provided with a flange having a triangular cross section, and a trapezoidal cross section. And a disk body made of glass fiber reinforced resin that forms a flange portion having a square cross section by being combined with a flange integrated with the cylindrical body, and a plurality of through holes for inserting bolts are provided in the disk body. It is characterized by this.

  Conventionally, when joining a multilayer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer, a method of peeling off the glass fiber reinforced resin layer and using a filling adhesive has been adopted. However, by using this flange joint, it is possible to perform a coupling (flange joint structure) that does not require the step of stripping the glass fiber reinforced resin layer. According to the flange joint of the present invention, a cylindrical body made of glass fiber reinforced resin integrally provided with a flange having a triangular cross section, and a square cross section by being trapezoidal in cross section and being combined with the integral flange on the cylindrical body Since the disc body is made of a glass fiber reinforced resin disc body and a plurality of bolt insertion through holes are provided in the disc body, the disc body is mated with a bolt when coupling the joint. By fixing to the side member, the cylindrical body is also fixed, and even if it is composed of two parts, it can be coupled in the same manner as that composed of one part. And the manufacture of a cylindrical body becomes easy because the flange of a cylindrical body is changed from the conventional square shape to a triangular shape.

  A method for manufacturing a cylindrical body of a flange joint according to the present invention is a method for manufacturing a glass fiber reinforced resin cylindrical body of the above-described flange joint, which is performed by a vacuum injection molding method and has a length corresponding to the length of the cylindrical body. A short glass base material and a short glass base material corresponding to the length of the flange are used, and the short glass base material is arranged so that the short glass base material layer is sandwiched between the long glass base material layers. Is.

  The vacuum injection molding method is a well-known method. After the glass substrate is set in a molding die, the molding die is assembled, and a resin that has been stirred by adding a curing agent is injected into the molding die. Is obtained by impregnating a glass substrate placed in a mold and impregnating the resin with a resin and curing at normal temperature.

  According to the manufacturing method of the present invention, a glass fiber reinforced resin integral product of a flange joint manufactured by hand layup can be manufactured by a vacuum injection molding method. Manufacturing by vacuum injection molding tends to cause cracks associated with resin richness, making it difficult to manufacture cylindrical bodies with square flanges. Is easy to prevent. And, using a long glass substrate corresponding to the length of the cylinder and a short glass substrate corresponding to the length of the flange, the short glass substrate layer is sandwiched between the long glass substrate layers. By arranging the glass substrate, it can be easily manufactured, and the flange portion can be reinforced strongly.

  The glass substrate may be in the form of a mat such as a chopped strand mat or continuous strand mat, or may be in the form of a cloth such as a roving cloth, and a sheet or mat in which rovings in different directions are laminated. It may be in the form of a multilayer sheet composed of a plurality of layers such as a laminated sheet with cloth. Among these, it is particularly preferable to use a material obtained by laminating a reinforcing fiber knitted long fiber such as a roving cloth and a short fiber mat such as a chop mat and knitting with a yarn.

  As the resin, unsaturated polyester, vinyl ester, epoxy, phenol and the like can be used as appropriate.

  According to the flange joint of the present invention, when joining the joints, they can be joined in the same manner as that composed of one part, and the cylindrical body can be easily manufactured.

  According to the method for manufacturing a cylindrical body of a flange joint of the present invention, it is easy to prevent resin richness, and the flange portion can be reinforced strongly.

FIG. 1 is a perspective view showing a flange joint according to the present invention, in which a disc body is shown on the upper side and a cylindrical body is shown on the lower side. FIG. 2 is a longitudinal sectional view showing a multilayer pipe coupling structure using the flange joint according to the present invention. FIG. 3 is a cross-sectional view of molds (lower mold and upper mold) used in the method of manufacturing a flange joint cylindrical body according to the present invention. FIG. 4 is a cross-sectional view showing a substrate arrangement method used in the method of manufacturing a flange joint cylindrical body according to the present invention. FIG. 5 is a perspective view showing a conventional glass substrate arrangement method corresponding to the method for manufacturing a cylindrical body of a flange joint according to the present invention. FIG. 6 is a cross-sectional view showing a comparative example of a glass substrate disposing method corresponding to the manufacturing method of the flange joint cylindrical body according to the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a flange joint made of glass fiber reinforced resin (FRP) according to the present invention, and FIG. 2 shows a multilayer pipe connection structure (1) using this flange joint (11).

  The flange joint (11) includes a cylindrical body (12) and a disk body (14). A flange (13) having a triangular cross section is integrally provided at one end of the cylindrical body (12), and the disc body (14) has a plurality of bolt insertion through holes (at a predetermined interval in the circumferential direction). 15) is provided.

  The disc body (14) has a trapezoidal shape in which a triangular section having the same size as the flange (13) is cut from a rectangular section. The flange (13) having a triangular cross section of the cylindrical body (12) forms a tapered outer peripheral surface (13a) whose diameter increases toward the end surface, and the disc body (14) having a trapezoidal cross section is The tapered inner peripheral surface (14a) is formed so as to overlap the tapered outer peripheral surface (13a) of the flange (13) of the cylindrical body (12). As a result, the disc body (14) and the flange (13) of the cylindrical body (12) are combined to form a flange section (11b) having a square cross section. In this way, the flange joint (11) composed of the cylindrical portion (11a) and the flange portion (11b) having a square cross section includes the cylindrical body (12) integrally provided with the flange (13) having a triangular cross section, and a glass fiber reinforced resin. It is comprised by two members with the disc body (14) made from.

  The multilayer pipe coupling structure (1) is a structure in which a rigid polyvinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer is coupled using a flange joint, and the rigid polyvinyl chloride resin pipe (3) and A multilayer tube (2) made of a glass fiber reinforced resin layer (4) provided on the outer peripheral surface, a core (5) fitted on the outer periphery of the multilayer tube (2), and a core (5) And a flange joint (11) fitted on the outer peripheral surface.

  Two annular grooves (4a) are formed in the glass fiber reinforced resin layer (4) of the multilayer tube (2), and the core (5) is fitted into the annular groove (4a). An annular convex part (5a) is formed. The core (5) has a split structure composed of two semi-cylindrical bodies, so that the core (5) can be fitted into the multilayer pipe (2). The outer peripheral surface of the core (5) is a tapered surface. The inner peripheral surface of the flange joint (11) is a tapered surface corresponding to the taper surface of the core (5), and the flange joint (11) is a multilayer pipe ( After the core (5) is attached by being fitted to 2), the core (5) is fitted to the outer periphery of the core (5) by being moved axially outward along the multilayer tube (2).

  The multi-layer pipe connection structure (1) includes a bolt (11) and a flange joint (11) and a flange part (17) of a mating member overlapped with each other, and a bolt (15) inserted through a bolt insertion through hole (15) Combined by 16). At this time, when the disc body (14) is fixed to the mating member by the bolt (16), the tapered inner peripheral surface (14a) of the disc body (14) is tapered to the flange (13) of the cylindrical body (12). The cylindrical body (12) is fixed by pressing the outer peripheral surface (13a) outward in the axial direction, and even if it is composed of two parts, it is coupled in the same manner as that composed of one part be able to.

  The manufacturing method of a cylindrical body of a flange joint according to the present invention is to manufacture the cylindrical body (12) of the above-described glass fiber reinforced resin flange joint (11) by a vacuum injection molding method.

  In the vacuum injection molding method, after the glass substrate is placed in the mold, the mold is assembled, and the resin that has been stirred by adding a curing agent is injected into the mold, and the air in the mold is sucked and molded. A molded article is obtained by impregnating a glass substrate placed in a mold with a resin and curing it at room temperature.

  In the manufacture of the flange joint (11), the lower mold (21) and the upper mold (22) shown in FIG. 3 are used.

 The lower die (21) has an annular flat surface (bottom surface) (21a) for forming the axially outer surface of the flange (13) having a triangular cross section, and an inner peripheral surface (tapered surface) of the cylindrical body (12). And a columnar portion (21c) for forming the.

  The upper die (22) has an inner peripheral surface (22a) for forming the outer peripheral surface (tapered surface) of the cylindrical body (12) and a taper for forming the tapered surface (13a) of the flange portion (13). A surface (22b) and a top surface (22c) for forming an end surface of the cylindrical body (12) are provided.

  As will be described later, glass substrates (17) and (18) are disposed on the lower mold (21), and then the upper mold (22) is overlaid on the lower mold (21), and resin is injected. As shown in FIG. 3, the end of the cylindrical body (12) where the flange (13) is not provided is formed with a lid (12a), and the lid (12a) is removed by post-processing. The open shape is as shown in FIG.

  Here, in the case of a cylindrical body integrally provided with a flange having a square cross section, the lower mold (21) has a glass base for reinforcing the cylindrical portion of the cylindrical body (12) as shown in FIG. The glass substrate (32) for reinforcing the material (31) and the flange will be arranged, but the corner connecting from the tube part to the flange part may be bent by slitting the glass substrate (31). It is preferable in terms of strength, and in this case, a portion where the glass substrate (31) is not well adapted to the corner of the lower mold (21) is generated, and the possibility of becoming resin-rich is increased.

  Therefore, in the flange joint (11) of the present invention, the flange (13) of the cylindrical body (12) can be formed by adopting a two-part configuration that can be coupled in the same manner as a one-part configuration. As shown in FIG. 4, the glass is reduced to a triangular cross section and corresponds to the axial length of the cylindrical body (12) (longer than or equal to the length of the cylindrical body (12)). Uses a short glass substrate (18) corresponding to the axial length of the base material (17) and the flange (13) (gradually shortened from a length equal to the axial length of the flange (13)) The short glass substrate (17) is arranged so that the layer of the short glass substrate (17) is sandwiched between the layers of the long glass substrate (18).

  The layer of the short glass substrate (17) and the layer of the long glass substrate (18) may be composed of a single glass substrate or a plurality of glass substrates. The glass substrate (17) (18) is not particularly limited. For example, a knit fabric configuration in which a reinforcing fiber knitted fabric such as a roving cloth and a short fiber mat such as a chop mat are laminated and knitted with a polyester yarn ( For example, trade name: Easy Knit WBC8030 FRP Service Co., Ltd.) is suitable from the viewpoint of securing strength. The resin to be injected is not particularly limited, and for example, vinyl ester (trade name: Prominate P310 Japan Composite) is used.

  By arranging the short glass substrate (18) so that the layer of the short glass substrate (18) is sandwiched between the layers of the long glass substrate (17), the one shown in FIG. In the case of laminating only the base material (19) and laminating the short glass base material (20) on its outer peripheral side), it is weak against shearing in the direction of the arrow, but there is no such weak spot and molding The subsequent cylindrical body (12) can be a cylindrical body (12) with a strong flange (13).

(11) Flange joint
(11a) Cylindrical part
(11b) Flange
(12) Cylindrical body
(13) Flange
(14) Disc body
(15) Bolt insertion through hole
(17) Long glass substrate
(18) Short glass substrate

Claims (2)

  A flange joint composed of a cylindrical portion and a flange portion having a square cross section, a cylindrical body made of glass fiber reinforced resin integrally provided with a flange having a triangular cross section, and a trapezoidal cross section that is integral with the cylindrical body A flange joint comprising a disk body made of glass fiber reinforced resin that forms a flange section having a square section by being combined with a flange, and the disk body has a plurality of through holes for inserting bolts .   A method for producing a glass fiber reinforced resin cylindrical body of a flange joint according to claim 1, which is performed by a vacuum injection molding method and corresponds to the length of a long glass substrate and a flange corresponding to the length of the cylindrical body. A short glass base material is used, and the short glass base material is disposed so that the short glass base material layer is sandwiched between the long glass base material layers.

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