JP2023133692A - Piping joint - Google Patents

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

The present invention relates to a piping joint.

Patent Document 1 discloses a piping joint (connection joint) that is installed on a floor surface and connects a piping member on the underfloor side (outside piping) and a piping member on the indoor side (inner piping). The piping joint has an annular flange portion having a screw hole used for screwing the pipe to the floor.

Japanese Patent Application Publication No. 2009-236317

In such piping joints, an annular packing may be interposed between the flange portion and the floor surface for the purpose of improving indoor airtightness. The packing also has screw holes in the flange portion at positions corresponding to the screw holes. Therefore, when installing the piping joint on the floor, it is troublesome to align the screw holes in the flange and the screw holes in the packing by relatively rotating the flange and the packing.

An object of the present invention is to provide a piping joint that is easy to install.

The piping joint according to claim 1 has a cylindrical joint body and a flange side insertion hole provided on the outer circumferential surface of the joint body and into which a fixing member for fixing to a construction surface is inserted. A seal member that seals between a flange portion and the flange portion and the construction surface, the seal member having a center hole through which the joint body is inserted and a seal member side insertion hole through which the fixing member is inserted. A detent is provided on one of the outer circumferential surface of the joint body and the periphery of the center hole of the seal member, and a detent is engaged with the detent convex on the other in the circumferential direction. A recess is provided.

According to a second aspect of the invention, in the first aspect, a seal member receiving groove is provided along the circumferential direction near the base end of the flange portion on the outer circumferential surface of the joint body, and the center hole in the seal member A peripheral edge of the seal member is accommodated in the seal member housing groove, and the rotation preventing protrusion or the rotation preventing recess is provided within the seal member housing groove.

According to a third aspect of the present invention, in the second aspect of the present invention, the anti-rotation protrusion or the anti-rotation recess in the seal member accommodation groove is provided over the entire width of the seal member accommodation groove.

A front view of a piping joint. FIG. 2 is a sectional view taken along line AA in FIG. 1. A perspective view of the joint body and packing. A vertical cross-sectional view of a piping joint installed on the floor.

An embodiment embodying the present invention will be described below.
As shown in FIG. 4, the piping joint 1 of this embodiment is installed on a floor body (structure) Y, and connects a piping member (pipe P) on the under-floor side (lower side in the drawing) and the indoor side (on the upper side in the drawing). side) piping member (not shown, but for example, a water stop valve, etc.). Note that the pipe P is formed into a cylindrical shape from a synthetic resin material such as polyolefin (for example, crosslinked polyethylene or polybutene). Furthermore, an in-core I is inserted into the end of the pipe P.

The piping joint 1 includes a joint body 10 integrally molded 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. In the joint body 10, a large diameter cylindrical part 11 on the indoor side and a small diameter cylindrical part 12 on the underfloor side are connected on the same axis. A female screw member 13 is arranged on the inner peripheral surface of the large diameter cylindrical portion 11 . The female thread member 13 is inserted during injection molding of the joint body 10. The female thread member 13 is for connecting the piping member on the indoor side.

An insertion space 12a into which the end of the pipe P is inserted is provided inside the small-diameter cylindrical portion 12. A stepped portion 12b is provided on the inner peripheral 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) than the step portion 12b. A positioning surface 12d is provided at the base end of the inner circumferential surface of the small diameter cylindrical portion 12, which abuts against the distal end surface of the in-core I and defines the insertion position of the pipe P.

A seal ring holder 21 made of polyacetal resin is locked to the locking step 12c. A pair of seal rings 22 made of rubber such as ethylene-propylene-diene copolymer rubber (EPDM) are arranged at intervals between the seal ring retainer 21 and the stepped portion 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 both circumferential surfaces. Ru.

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 synthetic resin such as polyphenylene sulfide resin. Two locking grooves 40a are formed on the inner peripheral surface of the cap 40. Two locking protrusions 12e are formed on the outer peripheral surface of the small diameter cylindrical portion 12. The cap 40 is externally fitted onto the small-diameter cylindrical portion 12 and is connected to the small-diameter cylindrical portion 12 by snap-engaging the locking groove 40a with the locking protrusion 12e of the small-diameter cylindrical portion 12. .

The lock ring 31 constituting 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 so as to protrude and incline toward the inner end. A split ring 32 constituting the locking mechanism 30 is interposed between the lock ring 31 and the cap 40. The split ring 32 is made of synthetic resin such as polyphenylene sulfide resin. The split ring 32 backs up and maintains the inclination angle of the retaining piece 31a of the lock ring 31.

A lock ring holder 33 forming a retaining mechanism 30 is sandwiched between the seal ring holder 21 and the cap 40. A lock ring 31 is held between the lock ring presser 33 and the split ring 32. It is assumed that a pulling force is applied to the pipe P that has been inserted into the insertion space 12a and passed through the split ring 32 and the lock ring 31. In this case, the retaining piece 31a of the lock ring 31 bites into the outer peripheral surface of the pipe P, thereby preventing the pipe P from coming off from the piping joint 1. Further, 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 circumferential surface of the pipe P, thereby preventing the pipe P from coming off the piping joint 1.

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

On the outer peripheral surface of the large-diameter cylindrical portion 11, a seal member housing groove 15 is provided along the circumferential direction near the base end of the flange portion 14. An annular and plate-shaped packing 50 serving as a sealing member is superimposed on the end face of the flange portion 14 on the sealing member accommodation groove 15 side. The large diameter cylindrical portion 11 of the joint body 10 is inserted into the center hole 50a of the packing 50. In the packing 50, the periphery of the center hole 50a is accommodated in the seal member accommodation 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.

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

The packing 50 is made of a rubber-like elastic body. As the rubber-like elastic body, thermoplastic elastomer, rubber, etc. are preferably used. Examples of the thermoplastic elastomer include polyolefin thermoplastic elastomers, polyester thermoplastic elastomers, polyurethane thermoplastic elastomers, and the like. Examples of the rubber include ethylene-propylene-diene copolymer rubber (EPDM), ethylene-propylene copolymer rubber (EPM), butyl rubber (IIR), nitrile rubber (NR), styrene-butadiene copolymer rubber (SBR), etc. . One or more of these rubber-like elastic bodies may be appropriately selected and used depending on the purpose of use.

A plurality of (three in this embodiment) anti-rotation protrusions 15a are provided in the seal member housing groove 15 on the outer circumferential surface of the joint body 10. The plurality of anti-rotation convex portions 15a are arranged at equal intervals along the circumferential direction. The plurality of anti-rotation protrusions 15a are arranged out of phase in the circumferential direction with respect to the plurality of flange-side insertion holes 14a. In the sealing member accommodating groove 15, each anti-rotation convex portion 15a is provided over the entire width of the sealing member accommodating groove 15. Each detent convex portion 15a has a triangular cross-sectional shape and a convex curved apex.

In the packing 50, a plurality of (three in this embodiment) anti-rotation recesses (cutouts) 50b are provided at the periphery of the center hole 50a. The plurality of detent recesses 50b are arranged at equal intervals along the circumferential direction. The plurality of detent recesses 50b are arranged out of phase in the circumferential direction with respect to the plurality of seal member side insertion holes 50c. Each anti-rotation recess 50b has a triangular opening in cross section, and the inner surface of the apex of the triangle has a concave curved surface. The anti-rotation recess 50b of the packing 50 is engaged with the anti-rotation protrusion 15a of the joint body 10 in the circumferential direction within the seal member housing groove 15.

When the plurality of anti-rotation convex portions 15a of the joint body 10 and the plurality of anti-rotation recesses 50b of the packing 50 are engaged in the circumferential direction, the flange-side insertion hole 14a of the flange portion 14 and the sealing member side of the packing 50 are engaged with each other in the circumferential direction. The positions of the insertion holes 50c in the circumferential direction match at all locations (three locations). With the circumferential positions aligned, the screw B as a fixing member is inserted from the flange side insertion hole 14a to the seal member side insertion hole 50c and screwed into the construction surface Yb of the floor body Y. , the flange portion 14 is pressed against the construction surface Yb of the floor body Y via the packing 50, and the piping joint 1 is installed on the floor body Y.

The present embodiment with the above configuration can provide the following effects.
(1) When the plurality of anti-rotation protrusions 15a of the joint body 10 and the plurality of 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. Ru. Therefore, when handling the piping joint 1, it is possible to prevent the flange-side insertion hole 14a of the flange portion 14 and the seal member-side insertion hole 50c of the packing 50 from shifting in the circumferential direction. Therefore, there is no need to align the flange part side insertion hole 14a of the flange part 14 and the seal member side insertion hole 50c of the packing 50 during work, and the installation work of the piping joint 1 on the floor body Y becomes easy.

(2) In the packing 50, the periphery of the center hole 50a is accommodated in the seal member accommodation groove 15. Therefore, the packing 50 is locked by the inner surface of the sealing member housing groove 51, and the engagement between the locking protrusion 15a of the joint body 10 and the locking recess 50b of the packing 50 can be prevented from disengaging in the axial direction.

(3) The anti-rotation convex portion 15a of the joint body 10 and the anti-rotation recess 50b of the packing 50 are engaged in the circumferential direction within the seal member housing groove 15. Therefore, the flange side insertion hole 14a of the flange portion 14 and the seal member side insertion hole 50c of the packing 50 are prevented from shifting in the circumferential direction, and the rotation prevention convex portion 15a of the joint body 10 and the rotation prevention recess 50b of the packing 50 are prevented. It is possible to achieve both high-level prevention of disengagement in the axial direction.

(4) The anti-rotation convex portion 15a of the joint body 10 is provided over the entire width of the seal member housing groove 15. Therefore, it is possible to more effectively prevent the engagement between the anti-rotation convex portion 15a of the joint body 10 and the anti-rotation recess 50b of the packing 50 from disengaging in the axial direction within the seal member accommodation groove 15, and the flange portion of the flange portion 14 This prevents the side insertion hole 14a and the seal member side insertion hole 50c of the packing 50 from shifting in the circumferential direction, and prevents the engagement between the rotation prevention protrusion 15a of the joint body 10 and the rotation prevention recess 50b of the packing 50 in the axial direction. It is possible to achieve both prevention of dislodgement at a higher level.

(5) In the packing 50, the anti-rotation recess 50b is arranged out of phase in the circumferential direction with respect to the sealing member side insertion hole 50c. Therefore, it is possible to prevent the influence of reduced strength due to the provision of the anti-rotation recess (notch) 50b from spreading to the vicinity of the sealing member side insertion hole 50c, which leads to improved durability of the packing 50.

(Another example)
The present invention can also be implemented in the following embodiments.
(1) The joint body 10 has a plurality of anti-rotation convex portions 15a other than one or three (two, four, five, six, seven, etc.), and the packing 50 is configured accordingly. The number of anti-rotation recesses 50b may be one or more than three (two, four, five, six, seven, etc.).

(2) Providing an anti-rotation recess in the joint body 10 and providing an anti-rotation protrusion on the packing 50.

(3) The number of flange side insertion holes 14a in the joint body 10 is set to a plurality of holes other than three (two, four, five, six, seven, etc.), and the sealing member is installed in the packing 50 accordingly. The number of side insertion holes 50c may be one or more than three (two, four, five, six, seven, etc.).

(4) The anti-rotation convex portion 15a is provided outside the seal member housing groove 51 in the joint body 10. Accordingly, the anti-rotation recess 50b is provided in the packing 50 at a position other than the periphery of the center hole 50a.

(Additional note)
The technical idea that can be understood from the above embodiment will be described.
(1) In the seal member, the anti-rotation convex portion or the anti-rotation recess is arranged with a phase shift in the circumferential direction with respect to the seal member side insertion hole. Piping fittings listed in section.

(2) a cylindrical joint body; a flange portion provided on the outer peripheral surface of the joint body and having a flange side insertion hole through which a fixing member for fixing to the construction surface is inserted; and the flange portion; a seal member that seals between the construction surface and the joint body, the seal member having a center hole through which the joint body is inserted and a seal member side insertion hole through which the fixing member is inserted; A piping joint in which one of the seal members is provided with a rotation prevention protrusion, and the other is provided with a rotation prevention recess that is engaged in the circumferential direction with the rotation prevention projection.

1...Piping joint.

10... Joint body, 11... Large diameter cylindrical part, 12... Small diameter cylindrical part (a... insertion space, b... step, locking step, d... positioning surface, e... locking protrusion), 13... female thread member, 14...Flange part (a...Flange part side insertion hole), 15...Seal member accommodation groove (a...Detent convex part).

21...Seal ring holder, 22...Seal ring, 23...Spacer ring.

30... Retaining mechanism, 31... Lock ring (a... retaining piece), 32... Split ring, 33... Lock ring holder.

40...Cap (a...locking groove, b...slanted surface).

50... Packing (a... center hole, b... anti-rotation recess, c... sealing member side insertion hole).

B...Bis.

I...Incore.

P...pipe.

Y...Floor body (a...insertion hole, b...construction surface).

Claims (3)

a cylindrical joint body; a flange portion provided on the outer peripheral surface of the joint body and having a flange side insertion hole through which a fixing member for fixing to the construction surface is inserted; and the flange portion and the construction surface. a seal member having a center hole through which the joint body is inserted and a seal member side insertion hole through which the fixing member is inserted; A piping joint, wherein one of the peripheral edges of the center hole of the sealing member is provided with a rotation prevention protrusion, and the other side is provided with a rotation prevention recess with which the rotation prevention projection is engaged in the circumferential direction. A seal member accommodating groove is provided along the circumferential direction near the base end of the flange portion on the outer peripheral surface of the joint body, and a peripheral edge of the center hole of the seal member is accommodated in the seal member accommodating groove. 2. The piping joint according to claim 1, wherein the anti-rotation protrusion or the anti-rotation recess is provided within the seal member housing groove. The piping joint according to claim 2, wherein the anti-rotation protrusion or the anti-rotation recess is provided in the entire width of the seal member accommodation groove within the seal member accommodation groove.

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