JP2021042850A - Pipe joint - Google Patents

Abstract

To provide a pipe joint which is easy in connection work for connecting pipe materials.SOLUTION: A pipe joint 1 has a core 10 having a cylinder part 11, a pipe joint main body 20 having an outside cylinder part 21, and a packing 40 having a protrusion 41 protruding toward the cylinder part 11 from the outside cylinder part 21. The pipe joint 1 also comprises a guide ring 60 supported to an external peripheral face of the cylinder part 11. A pipe material 2 inserted between the cylinder part 11 and the outside cylinder part 21 passes the protrusion 41 in a first direction X1 in a state that its end face 2a contacts with the guide ring 60. Here, the guide ring 60 comprises a first curved face 60a curved toward an external peripheral side in a second direction X2 at an external peripheral face of an end portion in the first direction X1, and does not comprise an edge at a portion contacting with the packing 40. Also, an end of the first curved part 60a in the second direction X2 comprises an outside diameter dimension equal to an outside diameter dimension of the pipe material 2 or larger. Therefore, when the pipe material 2 passes the packing 40, the end face 2a does not contact with the packing 40.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pipe joint used for connecting pipe materials.

A fitting having an annular packing attached to the inner peripheral surface of the body, a core body inserted into the end of the pipe, and a body having a through hole for inserting the end of the pipe. , Patent Document 1. In Patent Document 1, the core body is provided with a joint portion at the base end portion, and the body portion is provided with a joint portion inside and behind the through hole. By joining the jointed portion and the jointed portion, the core body and the body portion are integrated. When connecting the pipe material used for the water pipe using the pipe joint of the same document, the end portion of the pipe material is inserted between the core body and the body portion. When the end portion of the pipe material is inserted between the core body and the body portion, the packing is elastically deformed to be in close contact with the outer peripheral surface of the pipe material, and water is stopped between the pipe material and the pipe joint.

Utility Model Registration No. 3210116

In such a pipe joint, when the end portion of the pipe material is inserted between the core body and the body portion, the end face of the pipe material in the insertion direction comes into contact with the packing. Here, the outer peripheral edge of the end face from which the pipe material is cut is provided with an edge. Therefore, when the pipe material is inserted between the core body and the body portion, the outer peripheral edge of the pipe material may damage the packing. Here, if the packing is damaged, water leakage occurs between the pipe material and the pipe joint. Therefore, when connecting the pipe material using such a pipe joint, it is necessary to chamfer the outer peripheral edge of the end surface of the pipe material, and it takes time and effort to connect the pipe material.

In view of these points, an object of the present invention is to provide a pipe joint in which a connection work for connecting pipe materials is easy.

In order to solve the above problems, the present invention includes a core having a tubular portion and an outer tubular portion located on the radial outer side of the tubular portion, and one end portion of the core in the axial direction of the tubular portion. The other of the axial direction is provided with a pipe joint main body for holding the pipe joint body and a packing provided in the outer tubular portion which is held in the middle of the axial direction and has a protruding portion protruding from the outer tubular portion toward the tubular portion. In a pipe joint in which an end portion of a pipe material to be connected is inserted between the cylinder portion and the outer cylinder portion from the side and the packing is elastically deformed and is in close contact with the outer peripheral surface of the pipe material, one of the axial directions. When the side is the first direction and the other side is the second direction, it is supported by the outer peripheral surface of the tubular portion, and the first is supported between the tubular portion and the outer tubular portion via the protruding portion. The guide ring has a guide ring that can be moved in one direction, and the guide ring is provided with an annular first curved surface that curves in the second direction toward the outer peripheral side at an end portion in the first direction. (1) A pipe joint characterized in that the end of the curved surface in the second direction has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material.

According to the present invention, a guide ring that can move in the axial direction along the body portion is arranged between the cylinder portion of the core and the outer cylinder portion of the pipe joint body. Further, the guide ring has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material. Therefore, when the end portion of the pipe material is inserted between the cylinder portion and the outer cylinder portion, the pipe material passes through the protruding portion of the packing while pushing the guide ring with the end face in the first direction in contact with the guide ring. .. Here, the guide ring includes a first outer peripheral surface portion that curves in the second direction toward the outer peripheral side at the end portion in the first direction, and does not have an edge. Therefore, when the guide ring passes through the protrusion, the guide ring does not damage the protrusion. Further, the end face of the pipe material passes through the protruding portion of the packing continuously with the guide ring in a state of being in contact with a guide ring having an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material. Thereby, when the end face of the pipe material passes through the packing, it is possible to prevent or suppress the outer peripheral edge of the end face from coming into contact with the packing. Therefore, even if the outer peripheral edge of the end face of the pipe material is not chamfered, it is possible to prevent or suppress the pipe material from damaging the packing. As a result, chamfering of the pipe material to be connected to the pipe joint becomes unnecessary, so that the pipe material connection work becomes easy.

In the present invention, the guide ring includes an annular second curved surface that is continuous with the second direction of the first curved surface and curves inward toward the second direction, and the first curved surface. The end in the second direction has an outer diameter dimension larger than the outer diameter dimension of the pipe material, and the end of the second curved surface in the second direction has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material. Can be prepared. In this way, it is easy to prevent the outer peripheral edge of the end surface of the pipe material that continuously passes through the packing from the guide ring from coming into contact with the packing.

In the present invention, the guide ring can be elastically deformable in the radial direction. In this way, it is easy to prevent the guide ring from damaging the packing when passing through the packing.

In the present invention, the guide ring is made of resin, and the guide ring outer annular portion extending in the second direction toward the outer peripheral side, and the radial inner side of the guide ring outer annular portion along the outer peripheral surface of the tubular portion. A guide ring inner annular portion extending in the direction of the guide ring, and a connecting portion connecting the end portion of the guide ring outer annular portion in the first direction and the guide ring inner annular portion in the first direction are provided. The annular portion may include the first curved surface and the second curved surface. In this way, the guide ring is elastically deformed in the radial direction.

In the present invention, it is possible to have a stopper that prevents the guide ring from falling out of the tubular portion in the second direction in the second direction from the protruding portion. In this way, the guide ring does not fall off from the core during the connection work for connecting the pipe material to the pipe joint. Therefore, the work of connecting the pipe material is easy. In addition, this can prevent the guide ring from being lost.

In the present invention, the stopper may be a protrusion protruding from the tubular portion to the outer peripheral side. In this way, it is easy to provide the stopper.

In the present invention, the outer tubular portion is provided with an annular groove around the axis in the second direction from the protruding portion on the inner peripheral surface, and an annular member is attached to the annular groove, and the annular member is attached. Is made of resin and extends in the first direction from the outer annular portion extending in the axial direction along the bottom surface of the annular groove and the end portion of the outer annular portion in the second direction toward the inner peripheral side. An inner annular portion is provided, and the end portion of the inner annular portion in the first direction projects from the inner peripheral surface to the inner peripheral side, and the inner diameter dimension of the annular member is smaller than the outer diameter dimension of the pipe material. , The stopper may be the annular member. In this way, when the end portion of the pipe material is inserted between the cylinder portion and the outer cylinder portion, the annular member can remove the foreign matter adhering to the outer peripheral surface of the pipe material. Therefore, it is possible to prevent foreign matter adhering to the outer peripheral surface of the pipe material from passing through the packing and damaging the packing. Further, in this way, it is possible to prevent the guide ring from coming off from the tubular portion in the second direction due to the annular member.

In the present invention, the pipe joint main body includes a tubular main body portion having a male screw at an end portion in the second direction, and a nut having a female screw screwed into the male screw and attached to the main body portion. ,
The main body portion includes a body portion having the male screw, and the nut has a nut portion having the female screw and located on the outer peripheral side of the body portion, and has a tubular shape located in the second direction from the body portion. An extension portion and an annular protrusion projecting from the extension portion to the inner peripheral side are provided, the body portion and the nut form the outer cylinder portion, and the packing is provided on the outer peripheral side of the protrusion portion. A sandwiched portion sandwiched between the end portion of the body portion in the second direction and the annular protrusion portion in the axial direction may be provided. In this way, it is easy to hold the packing on the outer cylinder portion. Further, the packing can be removed by disengaging the main body (body) and the nut. Therefore, even if the packing is damaged, the packing can be easily replaced.

In the present invention, the main body portion includes an annular wall portion protruding inward from the end portion of the body portion in the first direction, and the tubular portion is supported by an end surface on the inner peripheral side of the annular wall portion. It may be provided with a supported portion to be supported and a protrusion that abuts on the annular wall portion from the side in the second direction. In this way, in the core, the tubular portion is supported from the outer peripheral side by the annular wall portion and is held by the pipe joint main body. Further, in the core, since the protruding portion of the tubular portion abuts on the annular wall portion, when the tubular portion to be connected is inserted between the tubular portion and the outer tubular portion and moves in the first direction, the core is first together with the tubular portion. It is blocked from moving in the direction. Further, the protrusion provided on the tubular portion prevents the guide ring from falling off from the tubular portion in the first direction when the core is removed from the pipe joint body.

In the present invention, the annular end face is provided with an annular recess, and the tubular portion is provided with a locking protrusion that protrudes from the first direction of the protrusion toward the outer periphery and is inserted into the annular recess. be able to. By doing so, it is possible to prevent the core from falling off from the pipe joint body in the second direction by inserting the locking protrusion into the annular recess.

In the present invention, the main body portion includes an annular wall portion protruding inward from the end portion of the body portion in the first direction, and the core is on the outer peripheral side from the end portion of the tubular portion in the first direction. It is provided with three or more flange portions extending radially, and each of the plurality of flange portions is supported by the pipe joint body by contacting the inner peripheral surface of the body portion, and each flange is supported by the annular wall portion. Can be abutted from the side in the second direction. In this way, the core can be supported by the fitting body. Further, since the flange portion abuts on the annular wall portion from the side in the second direction, when the pipe material to be connected is inserted between the cylinder portion and the outer cylinder portion and moves in the first direction, the core is moved together with the pipe material. It is possible to prevent the movement in the first direction.

In the present invention, each flange includes an extension portion extending toward the outer peripheral side and an outer curved portion that curves in the second direction from the extending portion toward the outer peripheral side, and the outer curved portion is the body. It is desirable to contact the inner peripheral surface of the part. In this way, the contact area between the flange portion and the body portion can be secured, so that the core can be easily held by the body portion.

In the present invention, a plurality of slits extending in the axial direction may be provided on both sides of the tubular portion in the first direction in the circumferential direction of each flange. In this way, when a force is applied to the flange portion from the outer peripheral side, the end portion of the tubular portion in the first direction can be bent toward the inner peripheral side. Further, the flange portion can be pressed against the inner peripheral surface of the body portion by utilizing the bending of the end portion of the tubular portion in the first direction. This makes it possible to ensure that the core is held by the body.

According to the present invention, it is possible to prevent or prevent the pipe material from damaging the packing even if the outer peripheral edge of the end surface of the pipe material is not chamfered. As a result, it is not necessary to chamfer the pipe material to be connected to the pipe joint, so that the pipe material connection work becomes easy.

It is sectional drawing of the pipe joint of Example 1 to which this invention was applied. It is an exploded perspective view of the pipe joint of Example 1. FIG. It is explanatory drawing of the connection method of the pipe material and the pipe joint of Example 1. FIG. It is sectional drawing of the pipe joint of Example 2 to which this invention was applied. It is a perspective view of the core of the pipe fitting of Example 2. FIG. It is explanatory drawing of the connection method of the pipe material and the pipe joint of Example 2. FIG. It is sectional drawing of the pipe joint of the modification of Example 2. FIG. It is a perspective view of the core of a modification.

Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to the drawings.

(Example 1)
FIG. 1 is a cross-sectional view of a pipe joint to which the present invention is applied. FIG. 2 is an exploded perspective view of the pipe joint of FIG. The pipe joint 1 of this example is used for connecting the pipe material 2 when constructing a pipe for water supply. The pipe material 2 is made of a resin such as polyethylene. As shown in FIG. 1, the pipe joint 1 has a core 10 including a tubular portion 11 and a pipe joint main body 20 including an outer tubular portion 21 located on the outer peripheral side of the tubular portion 11. The pipe joint body 20 holds one end portion of the core 10 in the axial direction X along the axis L of the tubular portion 11. That is, the core 10 includes a supported portion 12 at one end of the tubular portion 11 in the axial direction X. The pipe joint main body 20 is provided with a support portion 22 for supporting the supported portion 12 on the inner peripheral surface. The core 10 is held on the inner peripheral side of the pipe joint body 20 by the supported portion 12 being supported by the support portion 22.

Further, the pipe joint 1 has a packing 40 held by the outer tubular portion 21 and a dust seal 45 (annular member). The packing 40 is held at the central portion of the outer tubular portion 21 in the axial direction X. The packing 40 includes a protruding portion 41 projecting from the outer tubular portion 21 to the inner peripheral side. The dust seal 45 is held at the other end portion of the outer tubular portion 21 in the axial direction X. Further, the pipe joint 1 includes a washer 50 and a lock ring 55 between the pipe joint body 20 and the core 10. The washer 50 and the lock ring 55 are arranged between the packing 40 and the dust seal 45 in the axial direction X.

Further, the pipe joint 1 includes a guide ring 60 arranged between the outer tubular portion 21 and the core 10. The guide ring 60 is supported by the outer peripheral surface of the tubular portion 11 and can move between the tubular portion 11 and the outer tubular portion 21 in the axial direction X via the packing 40. In the following description, the direction along the axis L of the core 10 is the axial direction X, one side of the axial direction X is the first direction X1, and the other side is the second direction X2. The dust seal 45 is located in the second direction X2 of the packing 40.

(Pupling fitting body, packing, and dust seal)
The pipe joint main body 20 includes a tubular main body portion 23 having a male screw 23a on the outer peripheral surface of an end portion in the second direction X2, and a nut 24 having a female screw screwed into the male screw 23a. The main body 23 and the nut 24 are made of metal and are cast products. The main body 23 includes a large-diameter body portion 25 (body portion) having a male screw 23a at the end portion of the second direction X2 and an annular wall portion extending inward from the end portion of the large-diameter body portion 25 in the first direction X1. 26 and a small-diameter body portion 27 extending in the first direction X1 from an end portion on the inner peripheral side of the annular wall portion 26.

The large-diameter body portion 25 includes an outer annular protrusion 28 projecting toward the outer peripheral side in the middle of the axial direction X. The male screw 23a is provided in a region in the second direction X2 with respect to the outer annular protrusion 28 on the outer peripheral surface of the large-diameter body portion 25. Further, the large-diameter body portion 25 has an inner diameter dimension smaller than the inner diameter dimensions of the first body portion 29 and the first body portion having a constant inner diameter dimension from the end of the second direction X2 toward the annular wall portion 26. A third body portion 31 having an inner diameter smaller than the inner diameter of the second body portion 30 and the first body portion 29 and larger than the inner diameter of the second body portion 30 is provided. The first body portion 29 is located on the outer peripheral side of the second body portion 30, and the second body portion 30 is on the inner peripheral side of the first body portion 29 and the third body portion 31. It protrudes into.

Here, in the pipe joint main body 20, the support portion 22 that supports the end portion of the core 10 in the first direction X1 is an annular end surface 26a on the inner peripheral side of the annular wall portion 26 and an annular recess provided in the annular end surface 26a. 32 and. The annular recess 32 is an end portion of the annular end surface 26a of the annular wall portion 26 in the first direction X1 and is provided at a boundary portion between the annular wall portion 26 and the small-diameter body portion 27.

The nut 24 has a female screw, a nut portion 34 located on the outer peripheral side of the large-diameter body portion 25, a tubular extension portion 35 located in the second direction X2 from the large-diameter body portion 25, and an extension portion 35. An inner annular protrusion 36, which protrudes from the inner peripheral side, is provided. The extension portion 35 has a first tubular extension portion 37 extending from the nut portion 34 in the second direction X2 and a second tubular extension portion 37 from the end of the second direction X2 toward the inner peripheral side. A tapered extension portion 38 inclined in the direction X2 and a second tubular extension portion 39 extending from the end of the tapered extension portion 38 in the second direction X2 to the second direction X2 are provided. The tapered extending portion 38 includes a tapered inner peripheral surface that is inclined in the second direction X2 toward the inner peripheral side. The inner annular protrusion 36 projects from the end portion of the first tubular extending portion 37 in the second direction X2 toward the inner peripheral side. The large-diameter body portion 25 and the nut 24 form the outer cylinder portion 21 of the pipe joint main body 20.

(Packing)
The packing 40 is made of rubber. It is sandwiched between the pipe joint body 20 and the nut 24. The packing 40 extends radially and is sandwiched between the end of the pipe joint body 20 (large diameter body portion 25) in the second direction X2 and the inner annular protrusion 36 of the nut 24 in the axial direction X. A holding portion 42 is provided. Further, the packing 40 extends from the end portion on the outer peripheral side of the first sandwiched portion 42 in the first direction X1 and is sandwiched between the outer peripheral surface of the pipe joint body 20 and the inner peripheral surface of the nut 24 in the radial direction. A second sandwiched portion 43 is provided. The protruding portion 41 of the packing 40 is continuous with the inner peripheral side of the first sandwiched portion 42. The cross-sectional shape of the protruding portion 41 is an oval shape in which the axial direction X is longer than the radial direction. The protruding portion 41 extends along the inner peripheral surface of the first body portion 29 of the main body portion 23. The end of the protrusion 41 in the first direction X1 is located in the second direction X2 with respect to the second body portion 30. The end of the protruding portion 41 on the inner peripheral side protrudes toward the inner peripheral side of the inner peripheral side end surface of the second body portion 30 of the main body portion 23. Here, the inner diameter of the inner peripheral end surface of the second body portion 30 is the same as the outer dimension of the pipe material 2 to be connected, or slightly larger than the outer dimension of the pipe material 2 to be connected. It is set. Therefore, the inner diameter dimension of the packing 40 is shorter than the outer diameter dimension of the pipe material 2 to be connected.

(Dust seal)
The dust seal 45 is made of resin. The dust seal 45 is attached to an annular groove 46 provided at an end portion of the inner peripheral surface of the nut 24 in the second direction X2. That is, the second tubular extension portion 39 in the extension portion 35 of the nut 24 includes an annular inner peripheral surface 39a extending in the second direction X2 with a constant inner diameter dimension. The annular groove 46 is provided at the end portion of the annular inner peripheral surface 39a in the second direction X2. As shown in FIG. 2, the dust seal 45 has an arc shape in which a part of the annular member in the circumferential direction is cut off, and is attached to the annular groove 46 from the inner peripheral side. The dust seal 45 has an outer annular portion 47 extending in the axial direction X along the bottom surface of the annular groove 46 and an inner extending in the first direction X1 from the end of the outer annular portion 47 in the second direction X2 toward the inner peripheral side. An annular portion 48 is provided. The end of the inner annular portion 48 in the first direction X1 projects toward the inner peripheral side of the annular inner peripheral surface 39a. Here, the inner diameter dimension of the annular inner peripheral surface 39a is the same as the inner diameter dimension of the inner peripheral side end surface of the second body portion 30 of the main body portion 23. Therefore, the inner diameter dimension of the annular inner peripheral surface 39a is substantially the same as the outer diameter dimension of the pipe material 2 to be connected. Therefore, the inner diameter of the dust seal 45, that is, the inner diameter of the end of the inner annular portion 48 of the dust seal 45 in the first direction X1, is smaller than the outer diameter of the pipe material 2.

(Washers and lock rings)
The washer 50 is made of resin. As shown in FIG. 1, the washer 50 has an annular wall portion 51 extending along the end surface of the inner annular protrusion 36 in the second direction X2 and an end portion on the inner peripheral side of the wall portion 51 in the first direction X1. An annular plate portion 52 that extends is provided. The plate portion 52 is in contact with the end surface on the inner peripheral side of the inner annular protrusion 36. The end surface of the plate portion 52 in the first direction X1 is in contact with the protruding portion 41 of the packing 40 from the second direction X2. The inner diameter of the plate portion 52 is larger than the outer diameter of the pipe material 2 to be connected.

The lock ring 55 is located in the second direction X2 of the washer 50. Further, the lock ring 55 is located inside the tapered extending portion 38 of the extending portion 35 of the nut 24 in the radial direction. As shown in FIG. 2, the lock ring 55 has an arc shape in which a part of the annular member in the circumferential direction is cut off. The lock ring 55 extends over an angle range of 270 ° or more. The lock ring 55 is made of metal and is elastically deformable in the radial direction. The lock ring 55 has a tapered outer peripheral surface portion 56a that inclines in the first direction X1 toward the outer peripheral side on the outer peripheral surface 56 that faces outward in the radial direction, and a constant outside from the end of the tapered outer peripheral surface portion 56a in the first direction X1. An annular outer peripheral surface portion 56b extending in the first direction X1 in terms of diameter is provided. Further, the lock ring 55 has a tapered surface 58a that is inclined inward toward the first direction X1 on the inner peripheral surface that faces inward in the radial direction, and a tapered surface 58a that is radially outward from the tip of the taper surface 58a in the first direction X1. A plurality of wedge-shaped annular protrusions 58 defined by an extending annular surface 58b are provided. The inner diameter dimension of the lock ring 55 defined by the inner peripheral end of each wedge-shaped annular protrusion 58 is smaller than the outer diameter dimension of the pipe material 2 to be connected.

(core)
The core 10 is made of resin. As shown in FIG. 1, the inner diameter dimension of the tubular portion 11 is constant. The tubular portion 11 includes a tapered surface 11a at the tip end portion of the second direction X2, which is inclined inward toward the second direction X2. Further, the tubular portion 11 is provided with an annular first projection 13 (projection) on the side of the core 10 in the second direction X2 with respect to the center of the axial direction X. Further, the tubular portion 11 includes a plurality of notches 14 extending in the axial direction X at the end portion of the first direction X1. The notches 14 may be provided at equal intervals around the axis L. As a result, the tubular portion 11 includes a plurality of tongue piece portions 15 extending in the axial direction X at the end portion of the first direction X1. Each tongue piece portion 15 is a portion located between two notches 14 adjacent to each other in the circumferential direction, and is arranged in a ring shape at equal angular intervals. As shown in FIG. 2, ribs 16 (locking protrusions) extending in the circumferential direction are provided at the end portions of each tongue piece portion 15 in the first direction X1. The rib 16 projects outward from each tongue piece portion 15. As shown in FIG. 1, the tongue piece portion 15 and the rib 16 provided on the tongue piece portion 15 are supported portions 12 supported by the pipe joint main body 20. The rib 16 is inserted into the annular recess 32 provided in the annular wall portion 26 of the pipe joint body 20 and is locked to the pipe joint body 20. Further, the tubular portion 11 includes an annular protrusion 17 that projects outward from a position adjacent to the second direction X2 of the notch 14 in the axial direction X. The protrusion 17 abuts on the annular wall portion 26 of the pipe joint body 20 from the side of the second direction X2.

(Guide ring)
The guide ring 60 is made of resin. As shown in FIG. 1, the guide ring 60 has a guide ring outer annular portion 61 extending in the second direction X2 toward the outer peripheral side, and a guide ring outer annular portion 61 radially inside along the outer peripheral surface of the tubular portion 11. It includes an extending guide ring inner annular portion 62, and a connecting portion 63 that connects the end of the guide ring outer annular portion 61 in the first direction X1 and the end of the guide ring inner annular portion 62 in the first direction X1. The end surface of the guide ring outer annular portion 61 in the second direction X2 and the end surface of the guide ring inner annular portion 62 in the second direction X2 are located on the same virtual surface orthogonal to the axis L. The guide ring 60 is elastically deformable in the radial direction.

Further, the guide ring 60 has a first curved surface 60a that curves in the second direction X2 toward the outer peripheral side at the end portion of the first direction X1 and a second continuous surface 60a in the second direction X2 of the first curved surface 60a. Two-way X
An annular second curved surface 60b that curves inward toward 2 is provided. In this example, the guide ring outer annular portion 61 includes a first curved surface 60a and a second curved surface 60b. The end of the first curved surface 60a in the second direction X2 has an outer diameter dimension longer than the outer diameter dimension of the pipe material 2. The end of the first curved surface 60a in the second direction X2 has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material 2.

The core 10 penetrates through the center hole of the guide ring 60. The guide ring 60 is supported so as to be slidable on the outer peripheral surface of the tubular portion 11. The guide ring 60 can move between the first protrusion 13 of the core 10 and the protrusion 17 in the axial direction X. The first protrusion 13 is a first stopper that prevents the guide ring 60 from falling out of the tubular portion 11 in the second direction X2. The protrusion 17 is a second stopper that prevents the guide ring 60 from falling out of the tubular portion 11 in the first direction X1.

Here, the core 10 is inserted into the inner peripheral side of the pipe joint body 20 from the second direction X2. Then, in the core 10, the supported portion 12 is supported by the supporting portion 22 of the pipe joint body 20 in a state where the protruding portion 17 is in contact with the annular wall portion 26 from the side of the second direction X2. It is held by the joint body 20. That is, in the core 10, each tongue piece portion 15 which is a supported portion 12 comes into contact with the annular end surface 26a on the inner peripheral side of the annular wall portion 26 of the pipe joint main body 20 (main body portion 23) from the inner peripheral side, and each tongue. The rib 16 provided on the one piece 15 is inserted into the annular recess 32 provided on the annular end surface 26a, so that the rib 16 is held by the pipe joint body 20.

When the core 10 is held by the pipe joint body 20, the first protrusion 13 is located between the dust seal 45 and the lock ring 55 in the axial direction X. Here, when the core 10 is held by the pipe joint body 20, the guide ring 60 is positioned between the first protrusion 13 and the lock ring 55 in the axial direction X. That is, the guide ring 60 is arranged in the first direction X1 of the dust seal 45 and the first protrusion 13 and in the second direction X2 of the lock ring 55.

(Connection between pipe material and pipe joint)
FIG. 3 is an explanatory diagram of a method of connecting the pipe material 2 and the pipe joint 1. When connecting the pipe material 2 and the pipe joint 1, as shown in FIG. 1, the core 10 is formed in the pipe joint body 20 by supporting the supported portion 12 by the support portion 22 of the pipe joint body 20. It is held on the peripheral side. Further, the core 10 is made immovable in the first direction X1 because the protrusion 17 provided on the tubular portion 11 comes into contact with the annular wall portion 26. The guide ring 60 is located in the second direction X2 of the protruding portion 41 of the packing 40 and the wedge-shaped annular protrusion 58 of the lock ring 55 while being supported by the outer peripheral surface of the tubular portion 11 of the core 10. From this state, as shown in FIG. 3A, the end portion of the pipe material 2 is inserted between the cylinder portion 11 of the core 10 and the outer cylinder portion 21 of the pipe joint body 20.

When the pipe material 2 is inserted between the outer cylinder portion 21 of the cylinder portion 11, the end surface 2a of the first direction X1 of the pipe material 2 is located between the core 10 and the outer cylinder portion 21 of the pipe joint body 20. It comes into contact with the guide ring 60 and moves the guide ring 60 in the first direction X1. Further, the guide ring 60 that moves in the first direction X1 comes into contact with the lock ring 55 and moves the lock ring 55 in the first direction X1 until it comes into contact with the washer 50.

Here, when the lock ring 55 comes into contact with the washer 50, the lock ring 55 cannot move any further in the first direction X1. Therefore, the guide ring 60 and the pipe material 2 pass through the inner peripheral side of the lock ring 55 while increasing the diameter of the lock ring 55.

After that, when the pipe material 2 further enters the first direction X1, as shown in FIGS. 3 (b) and 3 (c), the pipe material 2 has the packing 40 in a state where its end surface 2a is in contact with the guide ring 60. Passes through the protruding portion 41 of the first direction X1.

Here, the guide ring 60 includes a first curved surface 60a that curves in the second direction X2 toward the outer peripheral side at the end portion of the first direction X1. Therefore, the guide ring 60 does not have an edge at the portion in contact with the packing 40. Further, the guide ring 60 includes an annular second curved surface 60b that is continuous with the second direction X2 of the first curved surface 60a and is curved inward toward the second direction X2. The end of the first curved surface 60a in the second direction X2 has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material 2, and the end of the second curved surface 60b in the second direction X2 has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material 2. It has an outer diameter dimension. As a result, when the end surface 2a of the pipe material 2 passes through the packing 40, the outer peripheral edge of the end surface 2a is prevented or suppressed from coming into contact with the packing 40. Therefore, even if the outer peripheral edge of the end surface 2a of the pipe material 2 is not chamfered, it is possible to prevent or suppress the pipe material 2 from damaging the packing 40.

After that, the pipe material 2 is pushed to a predetermined position where the guide ring 60 abuts on the end face of the annular wall portion 26 of the main body portion 23 facing the second direction. As shown in FIG. 3C, when the pipe material 2 is pushed to a predetermined position and the nut 24 is tightened, each wedge-shaped annular protrusion 58 of the lock ring 55 bites into the outer peripheral surface of the pipe material 2 and the packing. In a state where 40 is elastically deformed, it comes into close contact with the outer peripheral surface of the pipe material 2 and stops water between the pipe material 2 and the pipe joint 1.

(Action effect)
According to the pipe joint 1 of this example, it is possible to prevent or suppress the outer peripheral edge of the end surface 2a of the pipe material 2 from coming into contact with the packing 40. Therefore, it is not necessary to chamfer the end surface 2a of the pipe material 2 to be connected. Therefore, the connection work of the pipe material 2 becomes easy. Further, the pipe joint 1 includes a stopper (first protrusion 13) for preventing the guide ring 60 from falling out from the tubular portion 11 in the second direction X2. Therefore, the guide ring 60 does not fall off from the tubular portion 11 in the second direction X2 during the connection operation. Therefore, the connection work of the pipe material 2 is easy. Further, since the guide ring 60 does not fall off from the core 10, it is possible to prevent the guide ring 60 from being lost.

Here, the guide ring 60 is made of resin and extends along the outer peripheral surface of the tubular portion 11 on the radial inner side of the guide ring outer annular portion 61 and the guide ring outer annular portion 61 extending in the second direction X2 toward the outer peripheral side. The guide ring inner annular portion 62 extends, and the connecting portion 63 for connecting the end portion of the guide ring outer annular portion 61 in the first direction X1 and the end portion of the guide ring inner annular portion 62 in the first direction X1 is provided. Therefore, the guide ring 60 is easily elastically deformed in the radial direction. Therefore, it is easy to prevent the guide ring 60 from damaging the packing 40 when passing through the packing 40.

Further, in this example, the outer tubular portion 21 is provided with an annular groove 46 around the axis L in the second direction X2 of the protrusion 41 on the inner peripheral surface, and the annular groove 46 is provided with a dust seal 45. Further, the inner annular portion 48 of the dust seal 45 has an end portion in the first direction X1 protruding toward the inner peripheral side from the inner peripheral surface, and the inner diameter dimension is smaller than the outer diameter dimension of the pipe material 2. Therefore, when the end portion of the pipe material 2 is inserted between the cylinder portion 11 and the outer cylinder portion 21, the dust seal 45 can remove the foreign matter adhering to the outer peripheral surface of the pipe material 2. Therefore, it is possible to prevent foreign matter adhering to the outer peripheral surface of the pipe material 2 from passing through the packing 40 and damaging the packing 40. Further, the inner annular portion 48 of the dust seal 45 has an end portion in the first direction X1 protruding toward the inner peripheral side from the inner peripheral surface, and the inner diameter dimension is smaller than the outer diameter dimension of the pipe material 2. Therefore, the dust seal 45 can prevent the guide ring 60 from falling out of the tubular portion 11 in the second direction X2. That is, the dust seal 45 also functions as a third stopper that prevents the guide ring 60 from falling out of the tubular portion 11 in the second direction X2. Therefore, it is possible to reliably prevent the guide ring 60 from falling off from the core 10 during the connection work of the pipe material 2.

Further, the pipe joint main body 20 includes a tubular main body portion 23 having a male screw 23a at the end portion in the second direction X2, and a nut 24 having a female screw screwed into the male screw 23a and attached to the main body portion 23. Be prepared. The large-diameter body portion 25 and the nut 24 of the main body portion 23 constitute the outer cylinder portion 21, and the packing 40 is located on the outer peripheral side of the protruding portion 41 at the end of the large-diameter body portion 25 in the second direction X2 in the axial direction X. A first sandwiched portion 42 sandwiched between the portion and the inner annular protrusion 36 of the nut 24 is provided. Further, the packing 40 includes a second sandwiched portion 43 sandwiched between the large-diameter body portion 25 and the nut 24 in the radial direction on the outer peripheral side of the first sandwiched portion 42. Therefore, it is easy to hold the packing 40 on the outer tubular portion 21 of the pipe joint main body 20. Further, the packing 40 can be removed by disengaging the main body 23 and the nut 24. Therefore, even if the packing 40 is damaged, the packing 40 can be easily replaced.

Further, in this example, the main body portion 23 of the pipe joint main body 20 includes an annular wall portion 26 protruding inward from the end portion of the large-diameter body portion 25 in the first direction X1. The tubular portion 11 includes a supported portion 12 supported by an end surface on the inner peripheral side of the annular wall portion 26, and a protrusion 17 that abuts on the annular wall portion 26 from the side of the second direction X2. As a result, in the core 10, the tubular portion 11 is supported by the annular wall portion 26 from the outer peripheral side and is held by the pipe joint main body 20. Further, in the core 10, since the protruding portion 17 of the tubular portion 11 abuts on the annular wall portion 26, the pipe material 2 to be connected is inserted between the tubular portion 11 and the outer tubular portion 21 and moves in the first direction X1. At that time, it is prevented from moving in the first direction X1 together with the pipe material 2. Further, the protrusion 17 provided on the tubular portion 11 prevents the guide ring 60 from falling off from the tubular portion 11 in the first direction X1 when the core 10 is removed from the pipe joint main body 20.

Further, in this example, the annular end surface 26a of the annular wall portion 26 includes an annular recess 32. The tubular portion 11 includes a protrusion 17 that protrudes outward from the first direction X1 of the protrusion 17 and is inserted into the annular recess 32. Therefore, by inserting the protrusion 17 into the annular recess 32, it is possible to prevent the core 10 from falling off from the pipe joint body 20 in the second direction X2.

The supported portion 12 of the core 10 may be a male screw provided at the end portion of the core 10 in the first direction X1, and the support portion 22 of the pipe joint body 20 may be a female screw screwed into the male screw 23a. In this case, the female screw of the pipe joint body 20 may be provided on the annular end surface 26a on the inner peripheral side of the annular wall portion 26.

Further, the second curved surface 60b provided on the outer peripheral surface of the guide ring 60 may be omitted.

Further, in the above example, both the first protrusion 13 and the dust seal 45 provided on the tubular portion 11 function as stoppers for preventing the guide ring 60 from falling off in the second direction X2, so that the dust seal 45 and the dust seal 45 Even if one of the first protrusions 13 is omitted, it is possible to prevent the guide ring 60 from falling off from the tubular portion 11 in the second direction X2. That is, in the pipe joint 1A provided with the dust seal 45, the first first protrusion 13 can be omitted. Further, when the cylinder portion is provided with the first protrusion 13, the dust seal 45 may be omitted.

(Example 2)
FIG. 4 is a cross-sectional view of a pipe joint of Example 2 to which the present invention is applied. FIG. 5 is a perspective view of the core of the pipe joint of FIG. FIG. 6 is an explanatory view of a state in which the pipe material 2 and the pipe joint of this example are connected. The pipe joint of the second embodiment will be described below with reference to FIGS. 4 to 6. The pipe joint 1A of the second embodiment has a configuration corresponding to the pipe joint 1 described above, except for the configuration of the core 10A. Therefore, the corresponding configurations are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, the pipe joint 1A of this example has a core 10A having a cylinder portion 11 and a pipe joint main body 20 having an outer cylinder portion 21 located on the outer peripheral side of the cylinder portion 11. The pipe joint main body 20 holds one end portion of the core 10A in the axial direction X along the axis L of the tubular portion 11. That is, the core 10A includes a supported portion 12 at one end of the tubular portion 11 in the axial direction X. The pipe joint main body 20 includes a support portion 22 that supports the supported portion 12 on the inner peripheral surface. The core 10A is held on the inner peripheral side of the pipe joint body 20 by the supported portion 12 being supported by the support portion 22.

Further, the pipe joint 1A has a packing 40 held by the outer tubular portion 21 and a dust seal 45 (annular member). The packing 40 is held at the central portion of the outer tubular portion 21 in the axial direction X. The packing 40 includes a protruding portion 41 projecting from the outer tubular portion 21 to the inner peripheral side. The dust seal 45 is held at the other end portion of the outer tubular portion 21 in the axial direction X. Further, the pipe joint 1A includes a washer 50 and a lock ring 55 between the pipe joint body 20 and the core 10A. The washer 50 and the lock ring 55 are arranged between the packing 40 and the dust seal 45 in the axial direction X. Further, the pipe joint 1A includes a guide ring 60 arranged between the outer tubular portion 21 and the core 10A. The guide ring 60 is supported by the outer peripheral surface of the tubular portion 11 and can move between the tubular portion 11 and the outer tubular portion 21 in the axial direction X via the packing 40.

The pipe joint main body 20 includes a tubular main body portion 23 having a male screw 23a on the outer peripheral surface of an end portion in the second direction X2, and a nut 24 having a female screw screwed into the male screw 23a. The main body portion 23 includes a large-diameter body portion 25 (body portion), an annular wall portion 26 extending inward from the end portion of the large-diameter body portion 25 in the first direction X1, and an inner peripheral side of the annular wall portion 26. A small-diameter body portion 27 extending from an end portion in the first direction X1 is provided. The large-diameter body portion 25 has an inner diameter dimension smaller than the inner diameter dimension of the first body portion 29 having a constant inner diameter dimension and the inner diameter dimension of the first body portion toward the annular wall portion 26 from the end of the second direction X2. A third body portion 31 having an inner diameter that is smaller than the inner diameter of the two body portions 30 and the first body portion 29 and larger than the inner diameter of the second body portion 30 is provided. The first body portion 29 is located on the outer peripheral side of the second body portion 30, and the second body portion 30 is on the inner peripheral side of the first body portion 29 and the third body portion 31. It protrudes into.

Here, in the pipe joint main body 20, the support portion 22 that supports the end portion of the core 10A in the first direction X1 is the end portion of the first direction X1 on the inner peripheral surface of the large-diameter body portion 25. More specifically, the support portion 22 is an end portion in the first direction X1 on the inner peripheral surface of the third body portion portion 31. In other words, the support portion 22 is a portion located on the inner peripheral surface of the large-diameter body portion 25 next to the second direction X2 of the annular wall portion 26.

The nut 24 has a female screw, a nut portion 34 located on the outer peripheral side of the large-diameter body portion 25, a tubular extension portion 35 located in the second direction X2 from the large-diameter body portion 25, and an extension portion 35. An inner annular protrusion 36, which protrudes from the inner peripheral side, is provided. The large-diameter body portion 25 and the nut 24 form the outer cylinder portion 21 of the pipe joint main body 20. Here, the packing 40 is sandwiched between the pipe joint body 20 and the nut 24. The protruding portion 41 projects toward the tubular portion 11 from the middle of the axial direction X in the outer tubular portion 21.

(core)
The core 10A is made of resin. As shown in FIG. 5, the core 10A includes a tubular portion 11 and a plurality of flange portions 70 radially extending from the end of the tubular portion 11 in the first direction X1 to the outer peripheral side. In this example, the core 10A includes eight flanges 70. The flange portions 70 are provided at equal angular intervals. Further, each flange portion 70 has an extension portion 71 extending radially outward from the edge in the first direction X1 of the tubular portion 11, and an outer curvature that curves in the second direction X2 from the extension portion 71 toward the outer peripheral side. A unit 72 is provided.

The outer peripheral end of each flange portion 70 (the outer peripheral end of the outer curved portion 72) has an arc shape centered on the axis L of the tubular portion 11. As shown by a chain line in FIG. 5, the diameter M1 of the virtual circle S formed by making the outer peripheral ends of the flange portions 70 continuous is the third body portion of the large diameter body portion 25 serving as the support portion 22 of the core 10A. It has a length dimension equal to or larger than the diameter M2 of the inner peripheral surface of the portion 31 (see FIG. 4).

A plurality of slits 75 extending in the axial direction X are provided on both sides of each flange portion 70 in the circumferential direction at the end portion of the tubular portion 11 in the first direction X1. Here, in this example, the tubular portion 11 does not have the tapered surface 11a and the first protrusion 13 (projection). However, the tubular portion 11 may include a tapered surface 11a and a first protrusion 13 (projection).

When the core 10A is held by the pipe joint main body 20, the nut 24 and the packing 40 are removed from the main body 23. Then, the core 10A is inserted into the main body 23 from the second direction X2.

When the core 10A is inserted into the main body 23, each of the plurality of flanges 70 passes through a second body portion 30 whose inner diameter is smaller than that of the support portion 22 (third body portion 31). Here, the core 10A is made of resin and includes a slit 75 at the end of the tubular portion 11 in the first direction X1. Further, each flange portion 70 includes an outer curved portion 72. Therefore, when each of the plurality of flange portions 70 passes through the second body portion 30, the end portions of the flange portions 70 and the tubular portion 11 in the first direction X1 bend toward the inner peripheral side. Therefore, each flange portion 70 can get over the second body portion 30.

When the second body portion 30 is overcome, the end portions of the flange portions 70 and the tubular portion 11 in the first direction X1 elastically return to the outer side in the radial direction. As a result, each flange portion 70 comes into contact with the inner peripheral surface of the third body portion 31. Therefore, the core 10A is in a state of being supported by the support portion 22 of the pipe joint main body 20. After that, as shown in FIG. 4, the core 10A is inserted until each of the plurality of flange portions 70 abuts on the annular wall portion 26 from the side of the second direction X2.

Here, the outer peripheral end of the flange portion 70 is located on the outer peripheral side of the inner peripheral surface of the second body portion 30. Therefore, when the core 10A supported by the support portion 22 moves in the second direction X2, the second body portion 30 and the flange portion 70 come into contact with each other to prevent the core 10A from falling off in the second direction X2. To prevent.

When the diameter M1 of the virtual circle S in which the outer peripheral ends of the flange portions 70 are continuous is larger than the diameter M2 of the third body portion 31, the outer curved portion 72 is in a state of being bent toward the inner peripheral side. , Contact the inner peripheral surface of the third body portion 31. That is, the core 10A is supported by the large-diameter body 25 in a state where the flange 70 is elastically in contact with the large-diameter body 25.

Next, the dust seal 45 is attached, and the nut 24 holding the lock ring 55, the washer 50, and the packing 40 is screwed into the main body 23. As a result, the pipe joint main body 20 is configured, and the packing 40 is held at the central portion of the outer tubular portion 21 in the axial direction X. Further, the packing 40 includes a protruding portion 41 projecting from the outer tubular portion 21 to the inner peripheral side. Further, the washer 50 and the lock ring 55 are arranged between the packing 40 and the dust seal 45 in the axial direction X.

After that, the guide ring 60 is placed between the dust seal 45 and the lock ring 55. In this example, the guide ring 60 is inserted between the pipe joint body 20 and the cylinder portion 11 from the side of the second direction X2 after the core 10A is held by the pipe joint body 20. Here, the dust seal 45 is made of resin and has an arc shape in which a part of the annular member in the circumferential direction is cut off. Therefore, when the guide ring 60 passes through the dust seal 45, the dust seal 45 elastically deforms to the outer peripheral side to allow the guide ring 60 to pass through. Further, after the guide ring 60 has passed through the dust seal 45, the dust seal 45 returns to its original shape. This will
The end of the inner annular portion 48 of the dust seal 45 in the first direction X1 projects toward the inner peripheral side of the annular inner peripheral surface 39a. Therefore, the dust seal 45 functions as a stopper for preventing the guide ring 60 from falling off in the second direction X2.

(Connection between pipe material and pipe joint)
When connecting the pipe material 2 and the pipe joint 1A, the core 10A is held by the pipe joint body 20 by supporting the supported portion 12 (each flange portion 70) by the support portion 22 of the pipe joint body 20. ing. Further, the core 10A is made immovable in the first direction X1 because each flange portion 70 comes into contact with the annular wall portion 26. The guide ring 60 is located in the second direction X2 of the protruding portion 41 of the packing 40 and the wedge-shaped annular protrusion 58 of the lock ring 55 while being supported by the outer peripheral surface of the tubular portion 11 of the core 10A. From this state, the end portion of the pipe material 2 is inserted between the cylinder portion 11 of the core 10A and the outer cylinder portion 21 of the pipe joint body 20.

When the pipe material 2 is inserted between the cylinder portion 11 and the outer cylinder portion 21, the pipe material 2 has the end surface 2a in the first direction X1 of the core 10A and the pipe joint, as in the case of the pipe joint 1 shown in FIG. It comes into contact with the guide ring 60 located between the outer cylinder portion 21 of the main body 20 and moves the guide ring 60 in the first direction X1. After that, when the pipe material 2 further enters the first direction X1, the pipe material 2 passes through the protruding portion 41 of the packing 40 in the first direction X1 with its end surface 2a in contact with the guide ring 60.

Here, the guide ring 60 includes a first curved surface 60a that curves in the second direction X2 toward the outer peripheral side at the end portion of the first direction X1. Therefore, the guide ring 60 does not have an edge at the portion in contact with the packing 40. Further, the guide ring 60 includes an annular second curved surface 60b that is continuous with the second direction X2 of the first curved surface 60a and is curved inward toward the second direction X2. The end of the first curved surface 60a in the second direction X2 has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material 2, and the end of the second curved surface 60b in the second direction X2 has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material 2. It has an outer diameter dimension. As a result, when the end surface 2a of the pipe material 2 passes through the packing 40, the outer peripheral edge of the end surface 2a is prevented or suppressed from coming into contact with the packing 40. Therefore, even if the outer peripheral edge of the end surface 2a of the pipe material 2 is not chamfered, it is possible to prevent or suppress the pipe material 2 from damaging the packing 40.

After that, as shown in FIG. 6, the pipe material 2 is pushed to a predetermined position where the guide ring 60 abuts on the extending portion 71 of the flange portion 70 of the core 10A. Here, the guide ring 60 includes a first curved surface 60a that curves in the second direction X2 toward the outer peripheral side at the end portion of the first direction X1. Therefore, the tip of the guide ring 60 penetrates between the outer curved portion 72 of the flange portion 70 and the tubular portion 11 and comes into contact with the extended portion 71. In a state where the pipe material 2 is pushed to a predetermined position and the nut 24 is tightened, each wedge-shaped annular protrusion 58 of the lock ring 55 bites into the outer peripheral surface of the pipe material 2, and the packing 40 is elastically deformed. The water is stopped between the pipe material 2 and the pipe joint 1A in close contact with the outer peripheral surface.

As the core of Example 1, the core 10A of Example 2 may be used. In this case, in the pipe joint main body 20, the support portion 22 that supports the core 10A is a portion located on the inner peripheral surface of the large-diameter body portion 25 next to the second direction X2 of the annular wall portion 26. Further, in this case, it is not necessary to provide the annular recess 32 on the annular end surface 26a on the inner peripheral side of the annular wall portion 26.

(Modification of Example 2)
FIG. 7 is a cross-sectional view of a pipe joint of a modified example of the second embodiment. The pipe joint 1B of the modified example has a configuration corresponding to the pipe joint 1A of the second embodiment. Therefore, the same reference numerals are given to the corresponding configurations, and the description thereof will be omitted. In FIG. 8, the core 10A shows only one side of the pipe shaft L in a cross-sectional view.

The pipe joint 1B of the modified example connects two pipe materials coaxially. As shown in FIG. 7, the pipe joint 1B of this example has two cores 10A having a tubular portion 11, an outer tubular portion 21 located on the outer peripheral side of the tubular portion 11 of one core 10A, and the other core 10A. A pipe joint main body 20 having an outer tubular portion 21 located on the outer peripheral side of the tubular portion 11 of the above. The pipe joint body 20 holds an end portion of the core 10A located in the second direction X2 in the first direction X1. Further, the pipe joint body 20 holds the end portion of the core 10A located in the first direction X1 in the second direction X2. The two cores 10A are the same as the core 10A of the pipe joint 1A of the second embodiment, respectively.

The pipe joint main body 20 includes a main body portion 23 having male threads 23a on the outer peripheral surfaces of the end portions of the second direction X2 and the end portions of the first direction X1, and two nuts 24 having female threads screwed into the male threads 23a. , Equipped with. The main body 23 has a tubular shape. Here, the pipe joint 1B has a configuration in which the center of the axial direction X is symmetrical with respect to the virtual surface T orthogonal to the axis L. Therefore, in the following, the side of the virtual surface T in the pipe joint body 20 in the second direction X2 will be described, and the description of the side in the first direction X1 will be omitted.

The main body 23 includes a large-diameter body 25 (body) and an annular wall 26 extending inward from the end of the large-diameter body 25 in the first direction X1. The large-diameter body portion 25 includes a male screw 23a at an end portion in the second direction X2. The large-diameter body portion 25 has an inner diameter dimension smaller than the inner diameter dimension of the first body portion 29 having a constant inner diameter dimension and the inner diameter dimension of the first body portion toward the annular wall portion 26 from the end of the second direction X2. A third body portion 31 having an inner diameter that is smaller than the inner diameter of the two body portions 30 and the first body portion 29 and larger than the inner diameter of the second body portion 30 is provided. The first body portion 29 is located on the outer peripheral side of the second body portion 30, and the second body portion 30 is on the inner peripheral side of the first body portion 29 and the third body portion 31. It protrudes into.

The nut 24 includes a nut portion 34 located on the outer peripheral side of the large-diameter body portion 25, a tubular extension portion 35 located in the second direction X2 from the large-diameter body portion 25, and an inner peripheral side from the extension portion 35. It is provided with an inner annular protrusion 36, which protrudes toward the surface. The nut portion 34 has a female screw that is screwed into the screw 23a. The large-diameter body portion 25 and the nut 24 form the outer cylinder portion 21 of the pipe joint main body 20. Here, the packing 40 is sandwiched between the pipe joint body 20 and the nut 24. The protruding portion 41 projects toward the tubular portion 11 from the middle of the axial direction X in the outer tubular portion 21.

Further, the pipe joint 1B has a packing 40 held by the outer tubular portion 21 and a dust seal 45 (annular member). The packing 40 is held at the central portion of the outer tubular portion 21 in the axial direction X. The packing 40 includes a protruding portion 41 projecting from the outer tubular portion 21 to the inner peripheral side. The dust seal 45 is held at the other end portion of the outer tubular portion 21 in the axial direction X. Further, the pipe joint 1B includes a washer 50 and a lock ring 55 between the pipe joint main body 20 and the core 10A. The washer 50 and the lock ring 55 are arranged between the packing 40 and the dust seal 45 in the axial direction X. Further, the pipe joint 1B includes a guide ring 60 arranged between the outer tubular portion 21 and the core 10. The guide ring 60 is supported by the outer peripheral surface of the tubular portion 11 and can move between the tubular portion 11 and the outer tubular portion 21 in the axial direction X via the packing 40.

In the pipe joint main body 20, the support portion 22 that supports the core 10A located on the side of the second direction X2 is the end portion of the first direction X1 on the inner peripheral surface of the large diameter body portion 25. More specifically, the support portion 22 is an end portion in the first direction X1 on the inner peripheral surface of the third body portion portion 31. The core 10A is held by the pipe joint body 20 by supporting the supported portion 12 (each flange portion 70) by the support portion 22 of the pipe joint body 20.

Also in this example, the pipe joint 1B includes a guide ring 60. Therefore, the end face 2a of the pipe material 2
Even if the outer peripheral edge of the pipe is not chamfered, it is possible to prevent or suppress the pipe material 2 from damaging the packing 40.

Further, in the pipe joint 1B of this example, the core 10A serves as a supported portion 12 supported by the pipe joint body 20, and a plurality of flange portions 70 extending radially from the end of the tubular portion 11 in the first direction X1 to the outer peripheral side. To be equipped. Therefore, it is easy to hold the core 10A in the pipe joint body 20.

(Other embodiments)
FIG. 8 is a perspective view of the core of the modified example. The core 10B of the modified example differs from the core 10A described above in the number of flange portions 70. That is, as shown in FIG. 8, the core 10B includes a tubular portion 11 and three flange portions 70 radially extending from the end of the tubular portion 11 in the first direction X1 to the outer peripheral side. It is provided in. Further, each flange portion 70 has an extension portion 71 extending radially outward from the edge in the first direction X1 of the tubular portion 11, and an outer curvature that curves in the second direction X2 from the extension portion 71 toward the outer peripheral side. A unit 72 is provided. The outer peripheral end of each flange portion 70 (the outer peripheral end of the outer curved portion 72) includes an arc centered on the axis of the tubular portion 11. A plurality of slits 75 extending in the axial direction X are provided on both sides of each flange portion 70 in the circumferential direction at the end portion of the tubular portion 11 in the first direction X1. The core 10B of the modified example can be used in place of the core 10 and the core 10A described above. It is desirable that the core includes a plurality of flange portions of 3 or more.

1,1A, 1B ... Pipe fitting, 2 ... Pipe material, 2a ... End face, 10,10A, 10B ... Core, 11 ... Cylinder, 11a ... Tapered surface, 12 ... Supported part, 13 ... First protrusion, 15 ... Tongue One part, 16 ... rib, 17 ... protrusion, 20 ... core, 20 ... pipe joint body, 21 ... outer cylinder, 22 ... support, 23 ... body, 24 ... nut, 25 ... large diameter body, 26 ... annular wall portion, 26a ... annular end face, 27 ... small diameter body portion, 28 ... outer annular protrusion, 29 ... first body portion, 30 ... second body portion, 31 ... third body portion, 32 ... ring Recess, 34 ... Nut part, 35 ... Extension part, 36 ... Inner annular protrusion, 37 ... First tubular extension part, 38 ... Tapered extension part, 39 ... Second tubular extension part, 39a ... Circular inner peripheral surface, 40 ... Packing, 41 ... Protruding part, 42 ... First pinched part, 43 ... Second pinched part, 45 ... Dust seal, 46 ... Circular groove, 47 ... Outer annular part, 48 ... Inner annular part , 50 ... washer, 51 ... wall part, 52 ... plate part, 55 ... lock ring, 56 ... outer peripheral surface, 56a ... tapered outer peripheral surface part, 56b ... annular outer peripheral surface part, 58 ... wedge-shaped annular protrusion, 58a ... tapered surface , 58b ... annular surface, 60 ... guide ring, 60a ... first curved surface, 60b ... second curved surface, 61 ... guide ring outer annular portion, 62 ... guide ring inner annular portion, 63 ... connection portion, 70 ... flange portion , 71 ... extension part, 72 ... outer curved part, 75 ... slit, M1 ... diameter of virtual circle, M2 ... diameter of inner peripheral surface of third body part, S ... virtual circle, T ... virtual surface, X ... Pipe axis direction

Claims (13)

In a core having a tubular portion, a pipe joint main body having an outer tubular portion located on the radial outer side of the tubular portion and holding one end portion of the core in the axial direction of the tubular portion, and the outer tubular portion. It has a packing provided in the middle of the axial direction and has a protruding portion protruding from the outer tubular portion to the tubular portion side, and between the tubular portion and the outer tubular portion from the other side in the axial direction. In a pipe joint in which the end portion of the pipe material to be connected is inserted into the pipe material and the packing is elastically deformed and is in close contact with the outer peripheral surface of the pipe material.
When one side in the axial direction is the first direction and the other side is the second direction,
A guide ring, which is supported by the outer peripheral surface of the tubular portion and can move between the tubular portion and the outer tubular portion in the first direction via the protruding portion, is provided.
The guide ring is provided with an annular first curved surface that curves in the second direction toward the outer peripheral side at an end portion in the first direction.
A pipe joint characterized in that the end of the first curved surface in the second direction has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material. The guide ring includes an annular second curved surface that is continuous with the second direction of the first curved surface and curves inward toward the second direction.
The end of the first curved surface in the second direction has an outer diameter dimension larger than the outer diameter dimension of the pipe material.
The pipe joint according to claim 1, wherein the end of the second curved surface in the second direction has an outer diameter dimension equal to or larger than the outer diameter dimension of the pipe material. The pipe joint according to claim 2, wherein the guide ring is elastically deformable in the radial direction. The guide ring is made of resin and extends along the outer peripheral surface of the tubular portion on the radial inner side of the guide ring outer annular portion extending in the second direction toward the outer peripheral side and the guide ring outer annular portion. The inner annular portion and the connecting portion connecting the end portion of the guide ring outer annular portion in the first direction and the end portion of the guide ring inner annular portion in the first direction are provided.
The pipe joint according to claim 3, wherein the guide ring outer annular portion includes the first curved surface and the second curved surface. The invention according to any one of claims 1 to 4, wherein the guide ring has a stopper for preventing the guide ring from falling out of the tubular portion in the second direction with respect to the protruding portion. Pipe fittings. The pipe joint according to claim 5, wherein the stopper is a protrusion protruding from the tubular portion to the outer peripheral side. The outer tubular portion is provided with an annular groove around the axis in the second direction with respect to the protruding portion on the inner peripheral surface.
An annular member is attached to the annular groove.
The annular member is made of resin, and has an outer annular portion extending in the axial direction along the bottom surface of the annular groove and the first annular member from the end of the outer annular portion in the second direction toward the inner peripheral side. With an inner annular portion extending in the direction,
The end portion of the inner annular portion in the first direction projects from the inner peripheral surface toward the inner peripheral side.
The inner diameter of the annular member is smaller than the outer diameter of the pipe material.
The pipe joint according to claim 5, wherein the stopper is the annular member. The pipe joint main body includes a tubular main body portion having a male screw at an end portion in the second direction, and a nut having a female screw screwed into the male screw and attached to the main body portion.
The main body portion includes a body portion having the male screw.
The nut has a female screw and is located on the outer peripheral side of the body portion, a tubular extension portion located in the second direction from the body portion, and an inner peripheral side from the extension portion. With a protruding annular protrusion,
The body portion and the nut form the outer tubular portion,
A claim characterized in that the packing is provided with a held portion sandwiched between the end portion of the body portion in the second direction and the annular protrusion portion in the axial direction on the outer peripheral side of the protruding portion. The pipe fitting according to any one of items 1 to 6. The main body portion includes an annular wall portion that projects inward from the end portion of the body portion in the first direction.
A claim characterized in that the tubular portion includes a supported portion supported by an end surface on the inner peripheral side of the annular wall portion, and a protrusion that abuts on the annular wall portion from the side in the second direction. Item 8. The pipe fitting according to Item 8. The annular end face is provided with an annular recess.
The pipe joint according to claim 9, wherein the tubular portion includes a locking protrusion that protrudes from the first direction of the protrusion to the outer peripheral side and is inserted into the annular recess. The main body portion includes an annular wall portion that projects inward from the end portion of the body portion in the first direction.
The core includes three or more flange portions that radiate from the end of the tubular portion in the first direction to the outer peripheral side.
Each of the plurality of flange portions is provided with a supported portion supported by an inner peripheral surface of the body portion at the outer peripheral end thereof.
The pipe joint according to claim 8, wherein each flange abuts on the annular wall portion from the side in the second direction. Each flange includes an extension portion extending toward the outer peripheral side and an outer curved portion curved from the extending portion toward the outer peripheral side in the second direction.
The pipe joint according to claim 11, wherein the outer curved portion contacts the inner peripheral surface of the body portion. The pipe joint according to claim 10 or 11, wherein a plurality of slits extending in the axial direction are provided on both sides of the tubular portion in the first direction in the circumferential direction. ..

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