Piping Fittings

Abstract

To provide a piping joint which is easy in installation work.SOLUTION: A piping joint 1 comprises: a cylindrical joint main body 10; a flange part 14 arranged at an external peripheral face of the joint main body 10, and having a flange-part side insertion hole 14a into which a screw fixed to a construction face is inserted; and a packing 50 for sealing a clearance between the flange part 14 and the construction face, having a center hole 50a into which the joint main body 10 is inserted, and also having a seal member-side insertion hole 50c into which the screw is inserted. A whirl-stop protrusion 15a is formed at an external peripheral face of the joint main body 10, and a whirl-stop recess 50b is formed at a peripheral edge of the center hole 50a of the packing 50. In a state that the whirl-stop protrusion 15a of the joint main body 10 and the whirl-stop recess 50b of the packing 50 are engaged with each other in a peripheral direction, the relative movement of the joint main body 10 and the packing 50 is prohibited.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a piping joint (connection joint) that is installed on a floor surface to connect a piping member (outer piping) below the floor to a piping member (inner piping) inside the room. The piping joint has an annular flange portion with screw holes that are used to fasten the piping joint to the floor surface with screws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-236317 Summary of the Invention [Problem to be solved by the invention]

[0004] In such piping joints, an annular packing is sometimes placed between the flange and the floor to improve the airtightness of the room. The packing has screw holes at positions corresponding to the screw holes in the flange. Therefore, when installing the piping joint on the floor, it is troublesome to rotate the flange and the packing relative to each other to align the screw holes in the flange with the screw holes in the packing.

[0005] An object of the present invention is to provide a piping joint that is easy to install. [Means for solving the problem]

[0006] The piping joint described in claim 1 comprises a cylindrical joint body, a flange portion provided on the outer peripheral surface of the joint body and having a flange portion-side insertion hole through which a fixing member for fixing to the installation surface is inserted, and a seal member that seals between the flange portion and the installation surface and has a central hole through which the joint body is inserted and a seal member-side insertion hole through which the fixing member is inserted, and a rotation-preventing protrusion is provided on one of the outer peripheral surface of the joint body and the periphery of the central hole of the seal member, and a rotation-preventing recess into which the rotation-preventing protrusion engages circumferentially on the other.

[0007] The invention of claim 2 is the same as claim 1, wherein a seal member accommodating groove is provided along the circumferential direction on the outer peripheral surface of the joint body near the base end of the flange portion, the periphery of the central hole of the seal member is accommodated in the seal member accommodating groove, and the anti-rotation protrusion or the anti-rotation recess is provided within the seal member accommodating groove.

[0008] The invention of claim 3 is based on claim 2, and in the seal member accommodating groove, the anti-rotation protrusion or the anti-rotation recess is provided over the entire width of the seal member accommodating groove. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. [Figure 2] Cross section of line AA in Figure 1. [Figure 3] FIG. [Figure 4] FIG. 1 is a longitudinal cross-sectional view of a piping fitting installed on the floor. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the present invention will be described. As shown in Figure 4, the piping joint 1 of this embodiment is installed on a floor (structural body) Y and connects a piping member (pipe P) on the underfloor side (lower side in the drawing) to a piping member (not shown, such as a stop valve) on the indoor side (upper side in the drawing). The pipe P is cylindrical and made of a synthetic resin material such as polyolefin (e.g., cross-linked polyethylene or polybutene). An incore I is inserted into the end of the pipe P.

[0011] The piping joint 1 comprises a joint body 10 integrally formed by injection molding using a synthetic resin material. The joint body 10 is inserted into an insertion hole Ya formed through the floor body Y. The joint body 10 has a large diameter cylindrical portion 11 on the indoor side and a small diameter cylindrical portion 12 on the underfloor side connected on the same axis. A female thread member 13 is disposed on the inner peripheral surface of the large diameter cylindrical portion 11. The female thread member 13 is inserted when the joint body 10 is injection molded. The female thread member 13 is for connecting the piping component on the indoor side.

[0012] An insertion space 12a is provided inside the small diameter cylindrical portion 12 to allow the end of the pipe P to be inserted. A step 12b is provided on the inner circumferential surface of the small diameter cylindrical portion 12 on the large diameter cylindrical portion 11 side. A locking step 12c is provided on the inner circumferential surface of the small diameter cylindrical portion 12 on the tip side (lower side in the drawing) of the step 12b. A positioning surface 12d is provided at the base end of the inner circumferential surface of the small diameter cylindrical portion 12 to abut against the tip surface of the incore I and determine the insertion position of the pipe P.

[0013] A seal ring holder 21 made of polyacetal resin is engaged with the engagement step 12c. A pair of seal rings 22 made of rubber such as ethylene-propylene-diene copolymer rubber (EPDM) is arranged at a distance between the seal ring holder 21 and the step 12b. A spacer ring 23 is arranged between the pair of seal rings 22. When the pipe P is inserted into the insertion space 12a, the seal ring 22 is crushed between the outer circumferential surface of the pipe P and the inner circumferential surface of the small-diameter cylindrical portion 12, thereby ensuring watertightness between the two circumferential surfaces.

[0014] The piping joint 1 includes a retaining mechanism 30 for holding the pipe P in the small diameter cylindrical portion 12 of the joint body 10, and a cap 40 for attaching the retaining mechanism 30 to the small diameter cylindrical portion 12. The cap 40 is made of a synthetic resin such as polyphenylene sulfide resin. Two locking grooves 40a are formed on the inner peripheral surface of the cap 40. Two locking ridges 12e are formed on the outer peripheral surface of the small diameter cylindrical portion 12. The cap 40 is fitted onto the outside of the small diameter cylindrical portion 12, and is connected to the small diameter cylindrical portion 12 by snap-engaging the locking grooves 40a with the locking ridges 12e of the small diameter cylindrical portion 12.

[0015] The lock ring 31 that constitutes the retaining mechanism 30 is made of a thin metal plate such as stainless steel and has an annular shape. A plurality of retaining pieces 31a are formed on the inner periphery of the lock ring 31, protruding and inclined toward the inner end. A split ring 32 that constitutes the retaining mechanism 30 is interposed between the lock ring 31 and the cap 40. The split ring 32 is made of a synthetic resin such as polyphenylene sulfide resin. The split ring 32 backs up and maintains the inclination angle of the retaining pieces 31a of the lock ring 31.

[0016] A lock ring retainer 33, which constitutes the retaining mechanism 30, is sandwiched between the seal ring retainer 21 and the cap 40. A lock ring 31 is sandwiched between the lock ring retainer 33 and the split ring 32. Suppose that a pulling force is applied to the pipe P inserted into the insertion space 12a and with the split ring 32 and lock ring 31 inserted through it. In this case, the retaining pieces 31a of the lock ring 31 bite into the outer peripheral surface of the pipe P, preventing the pipe P from coming off the piping joint 1. Furthermore, in this case, the split ring 31 is guided by the inclined surface 40b of the cap 40 to reduce its diameter and tighten the outer peripheral surface of the pipe P, preventing the pipe P from coming off the piping joint 1.

[0017] 1 to 4, an annular flange portion 14 is formed on the outer peripheral surface of the large-diameter cylindrical portion 11 of the joint body 10 at the edge opposite to the small-diameter cylindrical portion 12. A plurality of (three in this embodiment) insertion holes (flange-side insertion holes) 14a are formed through the flange portion 14. The plurality of flange-side insertion holes 14a are arranged at equal intervals along the circumferential direction.

[0018] A sealing member accommodating groove 15 is provided along the circumferential direction on the outer peripheral surface of the large-diameter cylindrical portion 11 near the base end of the flange portion 14. An annular, plate-shaped packing 50 serving as a sealing member is superimposed on the end face of the flange portion 14 on the sealing member accommodating groove 15 side. The large-diameter cylindrical portion 11 of the joint body 10 is inserted into a central hole 50a of the packing 50. The periphery of the central hole 50a of the packing 50 is accommodated in the sealing member accommodating groove 15. The flange portion 14 is superimposed on the indoor-side surface (construction surface) Yb of the floor body Y via the packing 50.

[0019] A plurality of (three in this embodiment) insertion holes (seal member side insertion holes) 50c are formed penetrating the packing 50. The plurality of seal member side insertion holes 50c are arranged at equal intervals along the circumferential direction.

[0020] The packing 50 is made of a rubber-like elastic material. Suitable rubber-like elastic materials include thermoplastic elastomers, rubber, etc. Examples of thermoplastic elastomers include polyolefin-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and polyurethane-based thermoplastic elastomers. Examples of rubber include ethylene-propylene-diene copolymer rubber (EPDM), ethylene-propylene copolymer rubber (EPM), butyl rubber (IIR), nitrile rubber (NR), and styrene-butadiene copolymer rubber (SBR). One or more of these rubber-like elastic materials can be appropriately selected and used depending on the intended use, etc.

[0021] A plurality of (three in this embodiment) anti-rotation protrusions 15a are provided in the seal member accommodating groove 15 on the outer peripheral surface of the joint body 10. The anti-rotation protrusions 15a are arranged at equal intervals along the circumferential direction. The anti-rotation protrusions 15a are arranged with a phase difference in the circumferential direction relative to the flange portion-side insertion holes 14a. Within the seal member accommodating groove 15, each anti-rotation protrusion 15a is provided across the entire width of the seal member accommodating groove 15. The cross section of each anti-rotation protrusion 15a is triangular, with the apex forming a convex curved surface.

[0022] The packing 50 has a plurality of (three in this embodiment) anti-rotation recesses (cutouts) 50b formed around the periphery of the central hole 50a. The anti-rotation recesses 50b are arranged at equal intervals along the circumferential direction. The anti-rotation recesses 50b are arranged circumferentially out of phase with the seal member-side insertion holes 50c. The cross-sectional opening of each anti-rotation recess 50b is triangular, and the inner surface of the apex of the triangle is a concave curved surface. The anti-rotation recesses 50b of the packing 50 are circumferentially engaged with the anti-rotation protrusions 15a of the joint body 10 within the seal member accommodating groove 15.

[0023] When the multiple anti-rotation protrusions 15a of the joint body 10 and the multiple anti-rotation recesses 50b of the packing 50 are engaged in the circumferential direction, the flange portion-side through-holes 14a of the flange portion 14 and the seal member-side through-holes 50c of the packing 50 are aligned in the circumferential direction at all locations (three locations). With the circumferential positions aligned, screws B as fixing members are inserted from the flange portion-side through-holes 14a to the seal member-side through-holes 50c and screwed into the installation surface Yb ​​of the floor body Y, whereby the flange portion 14 is pressed against the installation surface Yb ​​of the floor body Y via the packing 50, and the piping joint 1 is installed on the floor body Y.

[0024] The present embodiment having the above configuration can achieve the following effects. (1) When the multiple anti-rotation protrusions 15a of the joint body 10 and the multiple anti-rotation recesses 50b of the packing 50 are engaged in the circumferential direction, relative rotation between the joint body 10 and the packing 50 is prevented. Therefore, when handling the piping joint 1, it is possible to prevent the flange portion-side through-hole 14a of the flange portion 14 and the seal member-side through-hole 50c of the packing 50 from being misaligned in the circumferential direction. Therefore, there is no need to align the flange portion-side through-hole 14a of the flange portion 14 and the seal member-side through-hole 50c of the packing 50 during installation, which facilitates installation of the piping joint 1 on the floor Y.

[0025] (2) The periphery of the central hole 50a of the packing 50 is accommodated in the seal member accommodating groove 15. Therefore, the packing 50 is locked by the inner surface of the seal member accommodating groove 51, and the engagement between the anti-rotation protrusion 15a of the joint body 10 and the anti-rotation recess 50b of the packing 50 can be prevented from coming loose in the axial direction.

[0026] (3) The anti-rotation protrusions 15a of the joint body 10 and the anti-rotation recesses 50b of the packing 50 are engaged in the circumferential direction within the seal member accommodating groove 15. Therefore, it is possible to highly effectively prevent the flange portion-side through-holes 14a of the flange portion 14 and the seal member-side through-holes 50c of the packing 50 from shifting in the circumferential direction, and also to highly effectively prevent the engagement between the anti-rotation protrusions 15a of the joint body 10 and the anti-rotation recesses 50b of the packing 50 from coming loose in the axial direction.

[0027] (4) The anti-rotation protrusions 15a of the joint body 10 are provided across the entire width of the seal member accommodating groove 15. Therefore, the engagement between the anti-rotation protrusions 15a of the joint body 10 and the anti-rotation recesses 50b of the packing 50 in the seal member accommodating groove 15 can be more effectively prevented from coming loose in the axial direction, and it is possible to more effectively prevent the flange portion-side through-holes 14a of the flange portion 14 and the seal member-side through-holes 50c of the packing 50 from shifting in the circumferential direction and to more effectively prevent the engagement between the anti-rotation protrusions 15a of the joint body 10 and the anti-rotation recesses 50b of the packing 50 from coming loose in the axial direction.

[0028] (5) The anti-rotation recesses 50b are arranged circumferentially out of phase with the seal member-side insertion holes 50c in the packing 50. Therefore, the effect of the reduction in strength caused by the provision of the anti-rotation recesses (cutouts) 50b can be prevented from spreading to the vicinity of the seal member-side insertion holes 50c, which leads to improved durability of the packing 50.

[0029] (Another example) The present invention can also be implemented in the following manner. (1) The number of anti-rotation protrusions 15a in the joint body 10 is made to be more than one or three (two, four, five, six, seven, etc.), and accordingly, the number of anti-rotation recesses 50b in the packing 50 is made to be more than one or three (two, four, five, six, seven, etc.).

[0030] (2) The joint body 10 is provided with a rotation-preventing recess, and the packing 50 is provided with a rotation-preventing protrusion.

[0031] (3) The flange portion side insertion holes 14a in the joint body 10 may be made plural (two, four, five, six, seven, etc.) other than three, and accordingly, the sealing member side insertion holes 50c in the packing 50 may be made plural (two, four, five, six, seven, etc.) other than one or three.

[0032] (4) The anti-rotation projection 15a of the joint body 10 is provided outside the seal member accommodating groove 51. Correspondingly, the anti-rotation recess 50b of the packing 50 is provided at a position other than the periphery of the center hole 50a.

[0033] (Addendum) The technical concept that can be understood from the above embodiment will be described. (1) A piping joint according to any one of claims 1 to 3, wherein the anti-rotation convex portion or the anti-rotation concave portion in the seal member is arranged out of phase with respect to the seal member-side insertion hole in the circumferential direction.

[0034] (2) A piping coupling comprising: a cylindrical coupling body; a flange portion provided on the outer peripheral surface of the coupling body and having a flange portion-side insertion hole through which a fixing member for fixing to the installation surface is inserted; and a seal member that seals between the flange portion and the installation surface and has a central hole through which the coupling body is inserted and a seal member-side insertion hole through which the fixing member is inserted, wherein one of the coupling body and the seal member is provided with an anti-rotation protrusion, and the other is provided with an anti-rotation recess with which the anti-rotation protrusion engages in the circumferential direction. [Explanation of symbols]

[0035] 1...Pipe fitting. 10...joint body, 11...large diameter cylindrical portion, 12...small diameter cylindrical portion (a...insertion space, b...step portion, locking step, d...positioning surface, e...locking ridge), 13...female thread member, 14...flange portion (a...flange portion side insertion hole), 15...seal member accommodating groove (a...anti-rotation ridge). 21...seal ring retainer, 22...seal ring, 23...spacer ring. 30...anti-slip mechanism, 31...lock ring (a...anti-slip piece), 32...split ring, 33...lock ring retainer. 40...Cap (a...retaining groove, b...inclined surface). 50...Packing (a...center hole, b...rotation prevention recess, c...sealing member side insertion hole). B...bis. I…Incore. P...pipe. Y...Floor body (a...insertion hole, b...construction surface).

Claims

[Claim 1] a cylindrical joint body; a flange portion provided on the outer peripheral surface of the joint body and having a flange portion-side insertion hole through which a fixing member for fixing to a construction surface is inserted; and a seal member for sealing between the flange portion and the construction surface, the seal member having a central hole through which the joint body is inserted and a seal member-side insertion hole through which the fixing member is inserted, the outer peripheral surface of the joint body being provided with a rotation prevention protrusion, and the seal member being provided with a rotation prevention recess around the periphery of the central hole, into which the rotation prevention protrusion is engaged in the circumferential direction, the anti-rotation recesses of the seal member are arranged circumferentially out of phase with the seal member-side insertion hole, The anti-rotation recess has a triangular opening in cross section, and the inner surface of the apex of the triangle is a concave curved surface.

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