Resin joint with flange

Abstract

To provide a resin joint with a flange having high workability.SOLUTION: A joint 11A is made of thermoplastic resin, and has a joint part 12 and a tubular part 13A extending from the joint part 12. The joint has a flange part 14 formed by machining a pipe end part 51 of the tubular part 13A opposite the joint part 12, where the tubular part 13 and the flange part 14 are integrated, the tubular part 13 has no junction, and a length between the joint part 12 of the tubular part 13 and the flange part 14 is 80 mm or less when a nominal diameter of the pipe end part 51 is 50, 75, or 100 mm, and 100 mm or less when the nominal diameter of the pipe end part 51 is 150, 200, or 300 mm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flanged plastic joint. [Background technology]

[0002] In recent years, the construction industry has been plagued by issues such as an aging workforce and labor shortages, and modularization and BIM (Building Information Modeling) have been promoted as a means of streamlining construction work and improving productivity at construction sites. Plastic pipes, which are lighter than metal pipes, are attracting attention for water supply pipes, drainage pipes, and other piping.

[0003] Patent Document 1 discloses that when it is necessary to connect plastic pipes without performing EF fusion (Electro Fusion) work at the construction site, a plastic pipe with a flange at the end is manufactured at a factory by butt welding the plastic pipe body and a short pipe with a flange manufactured by injection molding, and then the flange joint surfaces of the two plastic pipes are butted together and connected at the construction site using connecting parts such as loose flanges, bolts, nuts, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-51029 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a demand for improved workability in flanged resin joints. Also, when flanged resin joints are long, they have problems such as poor fit and significant restrictions on piping design, so there is a demand for greater freedom in piping design.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a flanged plastic joint that enables improved workability and allows for greater freedom in piping design. [Means for solving the problem]

[0007] The present invention has the following aspects. (1) One aspect of the flanged resin joint of the present invention is a joint made of thermoplastic resin, having a joint portion and a tubular portion extending from the joint portion, the joint having a flange portion formed by processing the end of the tubular portion opposite the joint portion, the tubular portion and the flange portion being integral, the tubular portion having no joint portion, the length between the joint portion and the flange portion of the tubular portion being 80 mm or less if the nominal diameter of the pipe end is 50, 75, or 100, and 100 mm or less if the nominal diameter of the pipe end is 150, 200, or 300.

[0008] In the above-described flanged plastic joint, the tubular portion and the flange portion are integral, and the tubular portion has no joint, allowing clamping anywhere on the tubular portion. This improves workability. Furthermore, in this joint, the length between the joint portion and the flange portion of the tubular portion is 80 mm or less if the nominal diameter of the pipe end of the tubular portion of the joint is 50, 75, or 100 mm, and is 100 mm or less if the nominal diameter of the pipe end is 150, 200, or 300 mm. This shortens the distance between the flange portion and the joint portion, resulting in a compact overall design. This allows for greater flexibility in piping design.

[0009] (2) In the above aspect (1), the length between the joint portion and the flange portion of the tubular portion may be 45 mm or more if the nominal diameter of the pipe end is 50, 75, or 100, and may be 70 mm or more if the nominal diameter of the pipe end is 150, 200, or 300.

[0010] In this case, the distance between the flange portion and the joint portion does not become too short.

[0011] (3) In the above aspect (1) or (2), the flange portion may have an annular recess on the joining surface opposite to the joint portion.

[0012] In this case, the sealing material can be well held on the joining surface. [Effects of the Invention]

[0013] According to the present invention, it is possible to improve workability. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing a flanged plastic joint according to an embodiment of the present invention. [Figure 2] 1 is a perspective view showing a flange portion of a flanged plastic joint according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a flanged resin joint according to an embodiment of the present invention will be described with reference to the drawings.

[0016] The flanged resin joint 11 according to this embodiment is made of a thermoplastic resin such as polyethylene, polypropylene, or polybutene, and has a joint portion 12, a tubular portion 13, and a flange portion .

[0017] The joint portion 12 has a cylindrical joint body portion 21 and a joint wrist base portion 22 that extends in a tapered shape from the joint body portion 21 along the axial direction of the joint body portion 21 while reducing both its inner and outer diameters.

[0018] The outer peripheral surface 21a on the radially outer side of the joint main body 21 is continuous with the outer peripheral surface 22a on the radially outer side of the joint wrist butt 22. The outer peripheral surface 21a of the joint main body 21 is a cylindrical surface with a constant outer diameter, and the outer peripheral surface 22a of the joint wrist butt 22 is a tapered surface that extends while reducing in diameter from one axial end of the outer peripheral surface 21a of the joint main body 21.

[0019] The radially inner inner circumferential surface 21b of the joint main body 21 is continuous with the radially inner inner circumferential surface 22b of the joint wrist butt section 22. The inner circumferential surface 21b of the joint main body 21 is a cylindrical surface with a constant inner diameter, and the inner circumferential surface 22b of the joint wrist butt section 22 is a tapered surface that extends while reducing in diameter from one axial end of the inner circumferential surface 21b of the joint main body 21.

[0020] A pair of metal terminals 25 for EF fusion (electrical fusion) protrude radially outward from the outer peripheral surface 21a of the joint body 21. A metal heating wire (not shown) that generates heat when power is supplied via the pair of terminals 25 is embedded within the joint body 21. Thus, the joint 12 is a joint for EF fusion. The joint 12 is made of thermoplastic resin except for the heating wire (not shown). The pipe to be connected is fitted into the joint body 21, and when power is supplied via the pair of terminals 25 in this state, the thermoplastic resin portion of the joint body 21 melts and joins to the pipe to be connected.

[0021] The tubular portion 13 is made entirely of a thermoplastic resin. The tubular portion 13 extends along the axial direction of the joint portion 12 from an end portion of the joint wrist base portion 22 on the opposite side to the joint main body portion 21 in the axial direction. The radially outer outer peripheral surface 13a of the tubular portion 13 is continuous with the radially outer outer peripheral surface 22a of the joint wrist base portion 22. The radially outer outer peripheral surface 13a of the tubular portion 13 is a cylindrical surface with a constant outer diameter, and extends from the small-diameter end of the outer peripheral surface 22a of the joint wrist base portion 22.

[0022] The radially inner inner circumferential surface 13b of the tubular portion 13 is continuous with the radially inner inner circumferential surface 22b of the joint wrist base portion 22. The inner circumferential surface 13b of the tubular portion 13 is cylindrical with a constant inner diameter, and extends from the small-diameter end of the inner circumferential surface 22b of the joint wrist base portion 22.

[0023] The tubular portion 13 is integral and has no joints, such as seams (beads), in the tubular portion 13. That is, the entire inner circumferential surface 13b of the tubular portion 13 extends continuously and smoothly, and the entire outer circumferential surface 13a also extends continuously and smoothly. The joint portion 12 and the tubular portion 13 are integral, and there is no joining portion, such as a seam (bead), at the boundary between the joint portion 12 and the tubular portion 13. In other words, the joint portion 12 and the tubular portion 13 have inner circumferential surfaces 21b, 22b, and 13b that extend continuously and smoothly, and the outer circumferential surfaces 21a, 22a, and 13a that extend continuously and smoothly.

[0024] The entire flange portion 14 is made of a thermoplastic resin. The flange portion 14 extends along the axial direction of the tubular portion 13 from the end of the tubular portion 13 opposite the joint portion 12 in the axial direction, and spreads outward in the radial direction of the tubular portion 13. The flange portion 14 has a perforated circular flange main body portion 31 and a flange neck portion 32 having a tapered outer diameter that extends from the inner periphery of the flange main body portion 31 along the axial direction of the flange main body portion 31 while reducing in outer diameter and connects to the tubular portion 13.

[0025] The outer peripheral surface 31a on the radially outer side of the flange main body 31 is a cylindrical surface with a constant outer diameter, and the end face 31b on the axial side of the flange main body 31 on the joint portion 12 side is a flat surface that is continuous with the outer peripheral surface 31a and extends radially inward from the outer peripheral surface 31a.

[0026] The outer peripheral surface 32a on the radially outer side of the flange neck portion 32 is continuous with the inner diameter side of the end face 31b of the flange main body 31 and has a tapered surface shape that extends toward the joint portion 12 while reducing in diameter from the end face 31b. The outer peripheral surface 32a of the flange neck portion 32 has an end portion on the joint portion 12 side in the axial direction that is continuous with the outer peripheral surface 13a of the tubular portion 13. The outer peripheral surface 32a of the flange neck portion 32 has a tapered surface shape that extends while increasing in diameter from the end portion of the outer peripheral surface 13a of the tubular portion 13 opposite the joint portion 12.

[0027] The radially inner inner circumferential surface 32b of the flange neck portion 32 is cylindrical and extends in the extension direction of the inner circumferential surface 13b, continuing from the end of the inner circumferential surface 13b of the tubular portion 13 opposite the axial joint portion 12. The radially inner inner circumferential surface 31c of the flange main body 31 is cylindrical and extends in the extension direction of the inner circumferential surface 32b, continuing from the end of the inner circumferential surface 32b of the flange neck portion 32 opposite the axial joint portion 12. The inner circumferential surface 13b of the tubular portion 13, the inner circumferential surface 32b of the flange neck portion 32, and the inner circumferential surface 31c of the flange main body 31 form the same cylindrical surface.

[0028] The flange main body 31 has a joint surface 31d on the opposite side to the axial end surface 31b, which is continuous with the outer peripheral surface 31a and has a flat shape that extends radially inward from the outer peripheral surface 31a. The joint surface 31d has a recess 41 that is recessed from the joint surface 31d toward the end surface 31b in the axial direction of the flange main body 31. As shown in FIG. 2, the recess 41 is annular, and is formed at a radially intermediate position of the joint surface 31d of the flange main body 31. The recess 41 is annular and coaxial with the flange main body 31.

[0029] As shown in FIG. 1, the tubular portion 13 is a portion that is located between the joint wrist base portion 22 of the joint portion 12 and the flange neck base portion 32 of the flange portion 14 and has a constant outer diameter.

[0030] The tubular portion 13 and the flange portion 14 are integral, and there is no joint, such as a seam (bead), at the boundary between the tubular portion 13 and the flange portion 14. In other words, the inner circumferential surfaces 13b, 32b, and 31c of the tubular portion 13 and the flange portion 14 extend continuously and smoothly, and the outer circumferential surfaces 13a and 32a, the end surface 31b, and the outer circumferential surface 31a also extend continuously and smoothly.

[0031] The flanged resin joint 11 is provided with a loose flange 45 in the shape of a perforated disk that is separate from the flanged resin joint 11. The loose flange 45 is disposed between the flange main body 31 and the joint part 12, with the tubular part 13 inserted radially inward. A tapered surface 45a is formed on the radially inner side of the loose flange 45, into which the outer peripheral surface 32a of the flange neck part 32 is fitted. The loose flange 45 is able to abut against the end face 31b of the flange main body 31.

[0032] The flanged resin joint 11 described above has the flange portion 14 formed later, and before the flange portion 14 is formed, the joint 11A has the joint portion 12 and the tubular portion 13A, which is the tubular portion 13 extending from the joint portion 12 and has the same outer and inner diameters as the joint portion 12, extended axially. The tubular portion 13A of the joint 11A has a shape that extends with a constant outer and inner diameter from the end on the joint portion 12 side in the axial direction to the pipe end 51 on the opposite side from the joint portion 12.

[0033] The flanged resin joint 11 is formed by processing the pipe end 51 of this joint 11A to form the flange portion 14. At that time, an annular recess 41 is also formed on the joining surface 31d of the flange portion 14 on the opposite side from the joint portion 12. The outer diameter of the pipe end 51 of the tubular portion 13A before the flange portion 14 is formed is equal to the outer diameter of the tubular portion 13 after the flange portion 14 is formed, and the inner diameter of the pipe end 51 of the tubular portion 13A is equal to the inner diameter of the tubular portion 13.

[0034] Therefore, in the flanged plastic joint 11, the tubular portion 13 is integral, and the tubular portion 13 does not have a joint, such as a seam (bead). In other words, the entire inner circumferential surface 13b of the tubular portion 13 extends continuously and smoothly, and the entire outer circumferential surface 13a also extends continuously and smoothly. In the flanged plastic joint 11, the tubular portion 13 and the flange portion 14 are integral, and there is no joint, such as a seam (bead), at the boundary between the tubular portion 13 and the flange portion 14. In other words, the inner circumferential surfaces 13b, 32b, and 31c of the tubular portion 13 and the flange portion 14 extend continuously and smoothly, and the outer circumferential surfaces 13a, 32a, end face 31b, and outer circumferential surface 31a also extend continuously and smoothly.

[0035] When processing the fitting 11A into the flanged resin fitting 11, for example, the flange portion 14 is formed by directly processing the pipe end portion 51 of the tubular portion 13A of the fitting 11A. That is, by directly processing the pipe end portion 51 of the tubular portion 13A, the outer peripheral surface 32a and inner peripheral surface 32b of the flange neck portion 32, and the outer peripheral surface 31a, end face 31b, inner peripheral surface 31c, joining surface 31d, and recess 41 of the flange main body portion 31 are formed. Accordingly, the portion of the tubular portion 13A before the flange portion 14 is formed, excluding the portion that becomes the flange portion 14, becomes the tubular portion 13 after the flange portion 14 is formed. In the flanged resin fitting 11 obtained in this manner, the tubular portion 13 and the flange portion 14 are integral, and there is no joining portion, such as a bead, between them, and there is also no joining portion, such as a bead, on the tubular portion 13. As a result, there are no irregularities caused by beads on the outer peripheral surfaces 21a, 22a, 13a, 32a, end surface 31b, and outer peripheral surface 31a of flanged resin joint 11. There are also no irregularities caused by beads on inner peripheral surfaces 21b, 22b, 13b, 32b, 31c of flanged resin joint 11. Note that "integral" does not mean that multiple members are joined together by fusion, welding, etc., but rather that they are a single member without being joined together.

[0036] The flanged resin joint 11 is provided with a perforated disk-shaped loose flange 45. In this case, before forming the flange portion 14 on the joint 11A, the tubular portion 13A is inserted into the loose flange 45, and in this state the flange portion 14 is formed on the joint 11A. This allows the loose flange 45 to be made into a single piece with no joints around its entire periphery.

[0037] Here, the length L of the tubular portion 13, which is the constant outer diameter portion between the fitting portion 12 and the flange portion 14, is 80 mm or less if the nominal diameter of the pipe end portion 51 of the fitting 11A before the flange portion 14 is formed is 50, 75, or 100, and is 100 mm or less if the nominal diameter of the pipe end portion 51 of the fitting 11A is 150, 200, or 300.

[0038] Furthermore, the length L of the tubular portion 13 is 45 mm or more if the nominal diameter of the pipe end 51 of the fitting 11A is 50, 75, or 100, and is 70 mm or more if the nominal diameter of the pipe end 51 of the fitting 11A is 150, 200, or 300.

[0039] The flanged resin joint 11 has identification information such as a marked line or lot number (not shown) marked on either the outer surface 21a, 22a of the joint portion 12, which is the portion excluding the flange portion 14, or the outer surface 13a of the tubular portion 13.

[0040] As described above, the flanged resin joint 11 has a joint 12 and a tubular portion 13A extending from the joint 12. The joint 11A has a flange 14 formed by processing the pipe end 51 of the tubular portion 13A on the side opposite the joint 12. The tubular portion 13 and the flange 14 are integral, and the tubular portion 13 has no joint, so that clamping can be performed anywhere on the tubular portion 13. This improves workability, particularly during EF fusion.

[0041] Furthermore, since the inner circumferential surfaces 21b, 22b, 13b, 32b, and 31c of the flanged plastic joint 11 are free of irregularities due to beads, a decrease in flow rate due to beads can be suppressed. Furthermore, the outer circumferential surfaces 21a, 22a, 13a, and 32a, end face 31b, and outer circumferential surface 31a of the flanged plastic joint 11 are free of irregularities due to beads. This results in the flanged plastic joint 11 having an excellent appearance and therefore high quality. Furthermore, by integrally forming the joint portion 12, the tubular portion 13, and the flange portion 14 of the flanged plastic joint 11, it is possible to mark identification information such as a benchmark or lot number on either the outer circumferential surfaces 21a and 22a of the joint portion 12 or the outer circumferential surface 13a of the tubular portion 13, i.e., the portion of the flanged plastic joint 11 excluding the flange portion 14.

[0042] Furthermore, in the flanged plastic joint 11, the length L of the tubular portion 13, which is the constant outer diameter portion between the joint portion 12 and the flange portion 14, is 80 mm or less if the nominal diameter of the pipe end portion 51 of the tubular portion 13A of the joint 11A before the flange portion 14 is formed is 50, 75, or 100 mm, and is 100 mm or less if the nominal diameter of the pipe end portion 51 is 150, 200, or 300 mm. Therefore, the flanged plastic joint 11 can shorten the distance between the flange portion 14 and the joint portion 12, resulting in a compact flanged plastic joint 11. This allows for greater flexibility in piping design.

[0043] Furthermore, in flanged plastic joint 11, the length of tubular portion 13, which is the constant outer diameter portion between joint portion 12 and flange portion 14, is 45 mm or more if the nominal diameter of pipe end portion 51 of tubular portion 13A of joint 11A is 50, 75, or 100, and is 70 mm or more if the nominal diameter of pipe end portion 51 is 150, 200, or 300. Therefore, in flanged plastic joint 11, the distance between flange portion 14 and joint portion 12 does not become too short, resulting in a flanged plastic joint 11 with high workability.

[0044] Furthermore, the flanged resin joint 11 has an annular recess 41 on the joining surface 31d of the flange portion 14 opposite the joint portion 12, which allows the sealing material to be held well on the joining surface 31d. The recess 41 can be formed at the same time as forming the flange portion 14. Note that the joining surface 31d of the flange portion 14 opposite the joint portion 12 may be a flat surface without the annular recess 41.

[0045] In the above embodiment, the joint portion 12 is an EF fusion joint extending coaxially from the tubular portion 13 on the side opposite the flange portion 14 of the tubular portion 13. However, this is not limiting. For example, the present invention can be applied to a T-shaped, so-called "cheese-type" flanged plastic joint, which has joint portions extending coaxially in two directions perpendicular to the tubular portion 13 from the side opposite the flange portion 14 of the tubular portion 13 instead of the joint portion 12. In the case of a cheese-type flanged plastic joint, one of the joint portions extending in two directions can be an EF fusion joint, both of the joint portions extending in two directions can be EF fusion joints, or both of the joint portions extending in two directions can be non-EF fusion joints. In any case, an annular recess 41 may or may not be provided on the joining surface 31d of the flange portion 14 on the side opposite the joint portion. [Explanation of symbols]

[0046] 11...flanged resin joint, 11A...joint, 12...joint portion, 13, 13A...tubular portion, 14...flange portion, 31d...joint surface, 41...recess, 51...pipe end portion.

Claims

1. a fitting made of a thermoplastic resin, the fitting having a joint portion and a tubular portion extending from the joint portion, the fitting having a flange portion formed by processing a pipe end portion of the tubular portion on the opposite side to the joint portion, the tubular portion and the flange portion are integral, and the tubular portion has no joint; A flanged plastic joint, wherein the length between the joint portion and the flange portion of the tubular portion is 80 mm or less if the nominal diameter of the pipe end is 50, 75, or 100 mm, and is 100 mm or less if the nominal diameter of the pipe end is 150, 200, or 300 mm.

2. 2. The flanged plastic joint according to claim 1, wherein the length between the joint portion and the flange portion of the tubular portion is 45 mm or more if the nominal diameter of the pipe end is 50, 75, or 100 mm, and is 70 mm or more if the nominal diameter of the pipe end is 150, 200, or 300 mm.

3. 3. The flanged plastic joint according to claim 1, wherein the flange portion has an annular recess on a joining surface opposite the joint portion.

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