JP5584583B2 - Joint for resin pipe and connection method using joint for resin pipe - Google Patents

Description

The present invention provides a joint body having a connecting tube portion that can be press-fitted into the connecting tube portion of the resin pipe from the tube axis direction, and a connecting tube portion having a larger diameter than the connecting tube portion, and a connecting tube portion of the joint body. and a pressing sleeve for pressing the connecting tube portion of the indented resin pipe from the radially outer side, the joint body linking tube and the fluid piping system of the pipe section and fitting for plastic pipe fittings, and the resin pipe is connected the It relates to the connection method used .

In the conventional joint for resin pipes, for example, as shown in FIG. 12, a connecting cylinder part 83 that can be press-fitted into the connecting pipe part 81 of the resin pipe 80 from the tube axis X direction and a diameter larger than that of the connecting cylinder part 83. A joint body 82 having a connecting tube portion 84 and a pressing sleeve 85 that presses the connection tube portion 81 of the resin tube 80 into which the connection tube portion 83 of the joint body 82 is press-fitted from the radially outer side. (See Patent Document 1). A plurality of retaining protrusions 86 a that can be eaten on the inner peripheral surface 81 a of the connecting pipe portion 81 of the resin pipe 80 are provided on the connecting cylinder portion 83 of the joint body 82 so as to protrude at intervals in the tube axis X direction. The fitting connection cylinder part 86 is provided. Then, in the resin tube 80 in which the pressing sleeve 85 is preliminarily fitted, the joint 81 until the end portion 81A of the connection tube portion 81 of the resin tube 80 abuts on the distal end portion 84A of the connecting tube portion 84 of the joint body 82. The connecting tube portion 83 of the main body 82 is press-fitted, and the pressing sleeve 85 is press-fitted into the connecting tube portion 81 into which the connecting tube portion 83 is press-fitted in an externally fitted state. The pressing sleeve 85 presses into the surface 81a and presses radially outward from the outer peripheral surface 81b of the connecting pipe portion 81, so that the resin pipe 80 and the joint body 82 are reliably integrated.
A coupling flange 84B that protrudes radially outward from the coupling cylinder portion 84 is formed at the proximal end portion of the joint body 82 (the proximal end portion of the coupling cylinder portion 84). The coupling flange 84B includes a bolt. A plurality of bolt insertion holes 84 a into which 87 can be inserted are formed. An on-off valve A is connected to a fluid pipe (not shown) to which the resin pipe 80 is connected, and a branch pipe section 88 (a pipe section of the fluid piping system) is integrally formed on the on-off valve A. A branch flange 88A is formed with a connecting flange 88A. A plurality of bolt insertion holes 88a into which the bolts 87 can be inserted are formed in the connection flange 88A. Therefore, in a state where the resin pipe 80 is connected to the joint body 82, each bolt insertion hole 84a formed in the connection flange 84B of the connection cylinder portion 84 of the joint body 82 is formed in the connection flange 88A of the branch pipe portion 88. The coupling flanges 84B and 88A can be connected and fixed by aligning with the bolt insertion holes 88a and fastening a plurality of bolts 87 and nuts 89 respectively inserted into the bolt insertion holes 84a and 88a. The resin pipe 80 and the branch pipe portion 88 can be connected.

  The basic configuration is the same as that of the joint for resin pipes described in Patent Document 1, but, for example, as shown in FIG. 13, the base end portion of the connecting tube portion 84 of the joint body 82 projects radially outward. It is also conceivable to adopt a configuration in which the small diameter portion 90 having a slightly smaller diameter than the outer diameter of the distal end portion 84A of the connection cylinder portion 84 is formed at the base end portion of the connection cylinder portion 84 without forming the connection flange. In this resin pipe joint, an outer peripheral threaded portion 90 a is formed on the outer peripheral surface of the small diameter portion 90. Further, the inner peripheral side threaded portion 88b is formed on the inner peripheral surface of the branch pipe portion 88 without forming a connecting flange in the branch pipe portion 88 of the fluid piping system. Then, in a state where the resin pipe 80 is connected to the joint main body 82, the outer peripheral side threaded portion 90 a formed in the small diameter portion 90 of the connecting cylinder portion 84 of the joint main body 82 is replaced with the inner peripheral side threaded portion of the branch pipe portion 88. The joint main body 82 and the branch pipe part 88 are connected by screwing to 88b. Thereby, the resin pipe 80 and the branch pipe part 88 can be connected.

JP 2009-30766 A

As described above, in the conventional joint for resin pipes, for example, as shown in FIG. 12, when connecting the joint main body 82 and the branch pipe portion 88, a plurality of joints are attached in the circumferential direction of the joint main body 82 and the branch pipe portion 88. Both the connecting flanges 84B and 88A formed on the joint main body 82 and the branch pipe portion 88 are connected and fixed using the bolts 87 and nuts 89 thus formed.
In this case, if the plurality of bolts 87 and nuts 89 are not tightened in substantially the same tightening state in the circumferential direction, a gap or tightening unevenness may occur between the coupling flanges 84B and 88A, and the fluid may leak. On the other hand, the plurality of bolts 87 and nuts 89 can be set to substantially the same tightening state, but when the number of the bolts 87 and nuts 89 is large, the work becomes very troublesome and the work efficiency is lowered.
In addition, when the branch pipe portion 88 is disposed in the vicinity of the on-off valve A, the on-off valve A protruding upward from the branch pipe portion 88, the branch pipe portion 88, and the joint body 82 In some cases, the space between the coupling flanges 84B and 88A becomes narrow. In such a case, the working space necessary for fastening the bolt 87 and the nut 89 becomes very narrow, and the fastening work becomes difficult. Therefore, the connecting operation between the branch pipe portion 88 and the joint main body 82 is an extremely time-consuming operation and there is a risk that the working efficiency may be reduced.
Furthermore, since both the connecting flanges 84B and 88A are connected using a plurality of bolts 87 and nuts 89, the number of parts increases and the cost increases.

  In addition, in the conventional joint for resin pipes, for example, as shown in FIG. 13, the outer peripheral side threaded part 90 a formed in the small diameter part 90 of the connecting cylinder part 84 of the joint main body 82 is replaced with the inner peripheral side of the branch pipe part 88. When screwing into the screw portion 88b, it is necessary to rotate the outer peripheral side screw portion 90a with respect to the inner peripheral side screw portion 88b which is the fixed side. In this case, since the resin pipe 80 which is a longitudinal member is already press-fitted and integrated with the joint main body 82 in which the outer peripheral side threaded portion 90a is formed, the joint main body 82 is used to rotate the outer peripheral side threaded portion 90a. And the resin pipe 80 needs to be rotated as a unit, and the outer peripheral side threaded part 90a is screwed to the inner peripheral side threaded part 88b to such an extent that the resin pipe 80 and the joint body 82 are securely fixed to the branch pipe part 88. The work to be combined is very time-consuming and may be a large-scale work. In particular, when the branch pipe portion 88 of the fluid piping system is buried underground, it is necessary to excavate extensively in order to secure a sufficient work space, and it takes more time and labor, and therefore requires a large work. It is desirable that the joint body 82 and the branch pipe portion 88 can be connected more simply and easily.

The present invention has been made in view of the above circumstances, and its purpose is to reliably prevent the leakage of fluid while the connection between the resin pipe and the pipe portion of the fluid piping system is simple. In addition, the present invention is to provide a joint for resin pipes that can be efficiently and easily performed and a connecting method using the joint for resin pipes .

A first characteristic configuration according to the present invention is a joint body including a connecting tube portion that can be press-fitted into the connecting tube portion of the resin tube from the tube axis direction, and a connecting tube portion having a larger diameter than the connecting tube portion, A pressing sleeve that presses the connecting pipe portion into which the connecting cylinder portion is press-fitted from the radially outer side, and a joint for a resin pipe that connects the connecting cylinder portion and the pipe portion of the fluid piping system,
A connecting flange projecting radially outward is integrally formed at the base end portion of the connecting tube portion,
A cylindrical connecting member fitted over the connecting cylindrical portion, and an inner peripheral threaded portion that can be screwed to an outer peripheral threaded portion of the tube portion is formed on the inner peripheral surface of the cylindrical connecting member; An annular projecting portion projecting radially inward from the inner peripheral surface is formed at the end of the cylindrical connecting member, and the inner peripheral side thread portion of the cylindrical connecting member is connected to the outer peripheral side screw of the tube portion. A structure in which the connecting flange and the pipe part are connected in a pressed state in which the annular projecting part is brought into contact with the connecting flange at the base end part of the connecting cylinder part from the pipe axis direction by being screwed to the part. so,
Projections having a diameter larger than the inner diameter of the annular projecting portion and smaller than the inner diameter of the cylindrical connecting member are integrally formed radially outward at a plurality of circumferential positions at the distal end portion of the connecting cylindrical portion. Protruding and formed
In the annular projecting portion, a plurality of cutout portions are formed at positions corresponding to the plurality of protrusions formed at the distal end portion of the connecting cylinder portion, and the cylindrical connecting member is in a state of being externally fitted to the joint body. Are moved from the connecting tube portion side to the connecting tube portion side along the tube axis direction, the plurality of notches of the tubular connecting member are the plurality of protrusions at the tip of the connecting tube portion. It is in the point formed so that passage is possible .

According to the above-mentioned characteristic configuration, the connection cylinder part is press-fitted into the connection pipe part of the resin pipe, the coupling main body having the pressing sleeve fitted thereto is provided, and the coupling is integrally formed at the base end portion of the coupling cylinder part in the coupling main body. In a state where the flange is in contact with or close to the pipe part of the fluid piping system, the inner peripheral side threaded part formed on the inner peripheral surface of the cylindrical connecting member fitted on the connecting cylindrical part of the joint body is connected to the pipe part. By rotating the cylindrical connecting member so as to be screwed into the outer peripheral side threaded portion formed on the outer peripheral surface, the annular protruding portion of the cylindrical connecting member is brought into contact with the distal end side surface of the connecting flange in the tube axis direction and pressed. As a state, the connection flange of a joint main body and a pipe part can be further connected by making the base end side of a connection flange contact a pipe part. As a result, only by rotating only the cylindrical connecting member fitted on the connecting cylinder portion of the joint body and screwing the inner peripheral side screw portion and the outer peripheral side screw portion, the connecting flange and pipe of the joint main body can be securely connected. The parts can be connected. That is, it is possible to efficiently connect the joint body and the pipe part by a very simple and easy operation by simply rotating the cylindrical connecting member without rotating the joint body and the resin pipe which is the longitudinal member. is there.
Further, unlike the conventional case, it is not necessary to use a plurality of bolts and nuts, and it is only necessary to introduce a cylindrical connecting member.
Furthermore, since the annular protrusion of the cylindrical connecting member and the connecting flange of the joint body come into contact with each other and are in a pressed state, and further, the connecting flange and the pipe portion come into contact and are in a pressed state. The tightening state can be made as uniform as possible in the circumferential direction, the tightening state can be stabilized, and fluid leakage can be prevented.
Therefore, the connection between the resin pipe and the pipe portion of the fluid piping system can be reliably and easily prevented from leaking the fluid while having a simple configuration.
In addition, since protrusions protruding radially outward are integrally formed at a plurality of circumferential positions at the distal end portion of the connecting cylinder portion, the protrusions are press-fitting and connecting the joint body to the resin pipe by the press-fitting device. Sometimes, a stopper function that restricts the maximum insertion length of the connecting tube portion of the joint body with respect to the end surface of the connecting pipe portion of the resin pipe from the tube axis direction, and a pressing sleeve for the resin pipe by the press-fitting device During the press-in operation, it is possible to exert a stopper function that regulates the maximum outer fitting length of the pressing sleeve with respect to the connecting pipe portion that is in a diameter-expanded state by contacting the end surface of the pressing sleeve from the tube axis direction.
Further, the plurality of protrusions at the distal end portion of the connecting cylinder portion are larger in diameter than the inner diameter of the annular projecting portion in the cylindrical connecting member fitted on the joint body, and smaller in diameter than the inner diameter of the cylindrical connecting member. In addition, the annular protrusion has a portion corresponding to a plurality of protrusions (with respect to the tube axis,
A plurality of notches are formed at a portion having the same angle in the circumferential direction. As a result, the cylindrical connecting member is externally fitted from the connecting tube portion side of the joint body before the resin tube is press-fitted, and moved from the connecting tube portion side to the connecting tube portion side along the tube axis direction, and then connected. By rotating the plurality of notches so as to have the same phase in the circumferential direction with respect to the plurality of protrusions formed at the tip of the cylindrical portion, the plurality of notches can pass through the plurality of protrusions, The annular projecting portion of the cylindrical connecting member can be externally fitted to the connecting cylindrical portion of the joint body.
Accordingly, the annular connecting member for connecting the joint body and the pipe portion is provided with a plurality of protrusions for restricting the maximum insertion length and the maximum outer fitting length during press-fitting connection work of the resin pipe and the pressing sleeve. By securely fitting the projecting portion to the connecting cylinder portion of the joint body and bringing the annular projecting portion and the connecting flange into contact with each other to be in a pressed state, the connecting flange and the pipe portion can be reliably connected. .

  A second characteristic configuration according to the present invention is that the contact between the annular protrusion and the connection flange is contact by surface contact.

  According to the above characteristic configuration, since the contact between the annular protrusion and the connecting flange is contact by surface contact, the annular protrusion has a larger contact area so that pressing unevenness does not occur in the circumferential direction. By pressing, it is possible to stabilize the tightening state more reliably, and it is possible to more reliably prevent fluid leakage between the annular projecting portion and the connecting flange, and thus between the connecting flange and the pipe portion.

A third characteristic configuration according to the present invention is that the plurality of protrusions and the plurality of notches are provided at three or more locations in the circumferential direction at equal intervals.

  According to the above characteristic configuration, the plurality of protrusions and the plurality of notches are provided at three or more locations at equal intervals in the circumferential direction, so that the joint body and the press sleeve are press-fitted into the resin pipe by the press-fitting device. When the ends of the resin tube and the pressing sleeve formed in an annular shape are in contact with a plurality of protrusions from the tube axis direction during the connection operation, the connection tube portion A stopper function that regulates the maximum insertion length and the maximum external fitting length of the pressing sleeve can be exhibited.

The 4th characteristic structure by this invention exists in the point by which the outer peripheral surface of the said cylindrical connection member is provided with the polygonal cross section by a cross-sectional view.

  According to the above characteristic configuration, since the outer peripheral surface of the cylindrical connecting member is formed with a polygonal cross section in a cross-sectional view, the inner peripheral side threaded portion of the cylindrical connecting member is replaced with the outer peripheral side threaded portion of the tube portion. When screwing together, it is possible to easily rotate only the cylindrical connecting member by applying a tool such as a spanner to the outer peripheral surface formed in a polygonal shape, and work can be performed efficiently.

According to a fifth characteristic configuration of the present invention, the pipe tube holding means of the press-fitting device that clamps and fixes the end portion of the connection pipe portion from the radially outer side to the distal end portion of the connection tube portion is contracted. A mounting cylinder portion that is capable of receiving the inner peripheral surface on the end portion side of the connection pipe portion that is deformed in diameter and that is formed in a straight tube shape or a substantially straight tube shape with an outer diameter smaller than the inner diameter of the connection tube portion. It is in a formed point.

According to the above characteristic configuration, when the connection tube portion of the joint body and the connection tube portion of the resin pipe are press-fitted and connected, the mounting tube portion formed at the tip of the connection tube portion is inserted into the connection tube portion of the resin tube. Thereby, it can suppress that the connection cylinder part of a joint main body tilts with respect to the connection pipe part of a resin pipe, or falls.
Moreover, press fitting work of the connecting tube portion of the joint body to the connecting pipe portion of the resin pipe is suppressed by suppressing deformation of the diameter of the connecting pipe portion beyond a certain level due to the holding and fixing action of the pipe holding means of the press fitting device. Since the mounting cylinder part itself is formed in a straight tube or a substantially straight tube with an outer diameter smaller than the inner diameter of the connecting pipe part of the resin pipe, the connecting pipe in contact with this The end portion side of the portion is also maintained in a straight tube shape or a substantially straight tube shape, so that the tube holding means can be prevented from moving out due to the tapered diameter reduction deformation on the end portion side of the connecting tube portion.
Therefore, the fitting posture of the joint body and the press-fitting device with respect to the resin pipe can be easily maintained with a reasonable modification only by forming the mounting cylinder portion on the distal end side of the connecting cylinder portion of the joint body. Connection work with the pipe can be performed efficiently and easily.

According to a sixth characteristic configuration of the present invention, the connecting tube portion is a tapered tube portion that guides the diameter of the connecting tube portion and the connecting tube portion in order from the distal end portion to the base end portion of the connecting tube portion. And a plurality of retaining protrusions that can bite into the inner peripheral surface of the connection pipe part, and a fitting connection cylinder part that protrudes at intervals in the pipe axis direction. is there.

According to the above characteristic configuration, when the connecting tube portion is further press-fitted into the resin tube in a state where the mounting tube portion in the connecting tube portion of the joint body is inserted into the resin tube, the region between the mounting tube portion and the fitting connecting tube portion Due to the tapered cylindrical part formed in the above, the connecting pipe part of the resin pipe can be press-fitted while smoothly expanding and deforming.
In addition, when the connecting tube portion of the joint body is press-fitted into the connecting tube portion of the resin tube and a pressing sleeve that presses the connecting tube portion after the press-fitting from the radially outer side is mounted, the connecting tube Since the retaining protrusion of the fitting connecting cylinder part that forms the part bites into the inner peripheral surface of the connecting pipe part of the resin pipe, it is possible to strongly prevent the connecting pipe part of the resin pipe and the connecting cylinder part of the joint body from being detached. be able to.
A seventh characteristic configuration according to the present invention is a connection method using a joint for resin pipes having any one of the first to sixth characteristic configurations,
The cylindrical connecting member is externally fitted to the connecting cylindrical portion, and the cylindrical connecting member is rotated around a tube axis so that the circumferential positions of the plurality of notches in the annular projecting portion are the plurality of protrusions. The cylindrical connecting member is moved from the connecting tube portion side to the connecting tube portion side along the tube axis direction in a state in which the plurality of cutout portions pass through the plurality of protrusions. And then press-fitting the connecting tube portion into the connecting tube portion from the axial direction of the tube, and the connecting tube portion in which the connecting tube portion is press-fitted in the state where the pressing sleeve is previously sheathed on the resin tube. The joint body in a state where the resin pipe is connected is press-fitted from the pipe axis direction into the pipe axis direction, and then the joint body in a state where the resin pipe is connected is moved in the pipe axis direction, and the proximal side surface of the coupling flange of the joint body In contact with the end face of the pipe part with a sealant interposed Te, the connection tubular part by rotating the tubular connecting member fitted state, there the inner peripheral side screw portion of the tubular coupling member in that screwed to the outer peripheral side threaded portion of the tube portion.

Half sectional side view of resin pipe joint in fluid piping system of the present invention (A) IIa-IIa arrow view of joint body, (b) Half cross-sectional side view of joint body, (c) IIc-IIc arrow view of joint body (A) Half cross-sectional side view including the IIIa-IIIa line arrow of the cylindrical connecting member, (b) IIIb-IIIb arrow view of the cylindrical connecting member Schematic diagram of outer fitting process of cylindrical connecting member The expanded sectional side view which shows the state which the notch part of a cyclic | annular protrusion part passes through the protrusion of a connection cylinder part. FIG. 5 is a cross-sectional view of the joint body and the cylindrical connecting member as viewed from the direction of the arrow VI-VI Schematic diagram of press fitting process of joint body Press-fitting process schematic diagram of pressing sleeve Partial side sectional view showing the state when press-fitting is completed Partial side sectional view showing a state where the connecting flange of the joint body is in contact with the pipe part (A) Schematic diagram of a connecting process for rotating a cylindrical connecting member, (b) A diagram showing a state in which a joint body and a pipe part are connected. Half sectional side view of a conventional joint for resin pipes Half sectional side view of a conventional joint for resin pipes

  Hereinafter, based on FIGS. 1 to 11, first, the configuration in the vicinity of the pipe portion 60 of the fluid piping system will be described, and then the resin pipe joint W according to the present invention will be described.

  As shown in FIG. 1, the fluid pipe axis Y of the fluid pipe 50 is formed on the outer peripheral surface 50a of an existing fluid pipe 50 (an example of a fluid piping system) such as a water pipe composed of a cast iron pipe, a steel pipe, a resin pipe or the like. A split pipe joint 52 made of cast iron integrally formed with a branch pipe portion 51 projecting outward along a horizontal or substantially horizontal direction (tube axis X direction) intersecting (orthogonal in the present embodiment) with respect to It is installed. The split pipe joint 52 is divided into a plurality of parts (three parts in this embodiment) in the pipe circumferential direction that can be externally mounted on the fluid pipe 50 from the outside in the pipe diameter direction. 52C. A plurality of bolts 53 and nuts, which are examples of fastening means, are connected to the adjacent split joint bodies 52A, 52B, and 52C covered by the fluid pipe 50 at both ends in the pipe circumferential direction of the split joint bodies 52A, 52B, and 52C. Connection portions 55, 56, and 57 that are fixedly connected to be detachable at 54 are integrally formed to project. The adjacent parts of the split joint bodies 52A, 52B, 52C are sealed, and the inner peripheral surfaces 52a, 52b, 52c of the split joint bodies 52A, 52B, 52C and the outer peripheral face 50a of the fluid pipe 50 are sealed. A plurality of sheet-like sealing materials 58 made of synthetic rubber are mounted (in this embodiment, three locations).

The on / off valve A is attached to the branch pipe portion 51 formed integrally with the split joint body 52C of the split pipe joint 52, and the perforation attached to the fluid pipe 50 in the branch pipe portion 51 via the on / off valve A. A circular branch port (not shown) having a tube axis X as an axis through an opening / closing valve A and a branch pipe part 51 opened by a rotary cutting tool (not shown) of a machine (not shown) Is formed through, and the inside of the fluid pipe 50 and the inside of the on-off valve A communicate with each other through a branch port.
On the on-off valve A, a pipe portion 60 (an example of a pipe portion of a fluid piping system) coaxial with the pipe axis X is formed on the opposite side of the branch pipe portion 51 in the tube axis X direction. On the outer peripheral surface, there is formed an outer peripheral side threaded portion 60a that can be screwed with an inner peripheral side threaded portion 6b formed in a cylindrical connecting member 6 described later.

Next, the joint W for resin pipes is demonstrated.
As shown in FIGS. 1 to 11 (particularly FIGS. 1 to 3), the joint W for resin pipes is a joint to a resin pipe 1 for water supply (an example of a fluid) manufactured from a synthetic resin such as polyethylene and polybutene. is there. The joint W for a resin pipe has a spherical shape provided with a connecting cylinder part 2 that can be press-fitted into the connecting pipe part 1A of the resin pipe 1 from the tube axis X direction and a connecting cylinder part 5 having a diameter larger than that of the connecting cylinder part 2. A metal joint body B such as graphite cast iron and a metal joint body B such as spheroidal graphite cast iron that presses the connection pipe portion 1A of the resin pipe 1 into which the connection tube portion 2 of the joint body B is press-fitted from the radially outer side. A pressing sleeve 3 and a cylindrical connecting member 6 made of metal such as spheroidal graphite cast iron that is externally fitted to the connecting cylinder part 5 of the joint body B are provided. The connecting cylinder part 5 of the joint body B and the fluid piping system It is comprised so that it can connect with the pipe part 60 of this.

  As shown in FIGS. 1 and 2, the joint body B includes a connection cylinder portion 2, and a pipe or other pipe or An annular connecting flange 8 is formed integrally with the pipe portion of the fluid device through the sheet-like sealing material 7 and protrudes radially outward for joining, and the tip of the connecting tube portion 5 In the portion (corresponding to the boundary between the connecting tube portion 2 and the connecting tube portion 5), protrusions 9 protruding radially outward are provided at a plurality of circumferential locations (four locations in the present embodiment), respectively in the circumferential direction, etc. They are integrally formed with a gap (90 degrees in this embodiment).

The connecting tube portion 2 of the joint body B is integrally provided with a mounting tube portion 4, a tapered tube portion 2B, and a fitting connecting tube portion 2A in the order from the distal end portion to the base end portion of the connecting tube portion 2. Configured.
The fitting connecting cylinder part 2A is formed on the most proximal side of the connecting cylinder part 2, and is a plurality of (four in this embodiment) annular shape that can be eaten into the inner peripheral surface 1a of the connecting pipe part 1A of the resin pipe 1 The retaining protrusions 2a are integrally projected at a predetermined interval in the tube axis X direction. In addition, it is good also as a structure which does not provide the said retaining protrusion 2a, and also when providing the retaining protrusion 2a, the number can be made into arbitrary numbers. The mounting cylinder 4 is formed on the most distal end side of the connection cylinder 2 and is formed in a straight tube shape or a substantially straight tube shape. The tapered cylindrical portion 2B is formed in a region from the base end of the mounting cylindrical portion 4 to the maximum outer diameter position that becomes the distal end of the retaining projection 2a in the foremost row, and guides the diameter of the connecting pipe portion 1A of the resin pipe 1 to expand. Formed as follows.

  The outer diameter of the fitting connecting tube portion 2A of the connecting tube portion 2 is larger than the inner diameter of the connecting tube portion 1A of the resin tube 1 before press-fitting and is outside the connecting tube portion 1A of the resin tube 1 before press-fitting. The diameter is smaller than the diameter. The mounting tube portion 4 of the connecting tube portion 2 is supported by a tube holding means (not shown) of a press-fitting device (not shown) that holds and fixes the end portion of the connecting tube portion 1A of the resin tube 1 from the radially outer side. As long as it has a length larger than the width and can receive the inner peripheral surface 1a on the end portion side of the connecting pipe portion 1A that is reduced in diameter by the holding and fixing action of the tube holding means, it can be received before press-fitting. The outer diameter is smaller than the inner diameter of the connecting pipe portion 1A of the resin pipe 1.

  The mounting cylinder 4 is preferably a straight tube having the same outer diameter over its entire length, and the outer diameter of the mounting cylinder 4 is in a state in which variations within the tolerance range of the inner diameter of the connecting pipe 1A of the resin pipe 1 can be absorbed. The outer diameter dimension is preferably such that a minute annular gap is generated as much as possible between the inner peripheral surface 1a of the connecting pipe portion 1A. If it is this structure, the installation cylinder part 4 of the coupling main body B can be smoothly inserted in the connection pipe part 1A of the resin pipe 1, and in addition, with respect to the connection pipe part 1A of the resin pipe 1 in the inserted state. The mounting cylinder portion 4 of the joint body A can be temporarily held stably in a predetermined posture with little play.

An annular connecting flange 8 formed to protrude radially outward from the proximal end portion of the connecting cylinder portion 5 is larger in diameter than an inner diameter of an annular protruding portion 10 of a cylindrical connecting member 6 described later, and The connecting member 6 (inner peripheral side threaded portion 6b) is formed with a smaller diameter than the inner diameter.
Similarly, the plurality of protrusions 9 formed to protrude radially outward from the distal end portion of the connecting cylinder portion 5 are larger in diameter than the inner diameter of the annular protruding portion 10 of the cylindrical connecting member 6, and the cylindrical connecting member 6. It is formed with a smaller diameter than the inner diameter of the (inner peripheral side threaded portion 6b). Further, the plurality of protrusions 9 are formed to have a diameter larger than the maximum inner diameter of the tapered surface 3b formed at the end of the inner peripheral surface 3a of the pressing sleeve 3 to be described later. As a result, the plurality of protrusions 9 come into contact with the end surface of the connecting pipe portion 1A of the resin pipe 1 from the tube axis X direction when the joint body B is press-fitted and connected to the resin pipe 1 by a press-fitting device (not shown). A stopper function for restricting the maximum insertion length of the connecting tube portion 2 with respect to the connecting tube portion 1A, and the pressing sleeve 3 from the end surface of the pressing sleeve 3 and the tube axis X direction when the pressing sleeve 3 is pressed into the resin tube 1 by the press-fitting device. It has a stopper function that regulates the maximum outer fitting length of the pressing sleeve 3 with respect to the connecting pipe portion 1A that is in contact with and expanded in diameter.

  The inner diameter of the pressing sleeve 3 is larger than the outer diameter of the connecting pipe portion 1A of the resin pipe 1 before press-fitting and smaller than the outer diameter of the expanded connecting pipe portion 1A after press-fitting. In addition, a taper surface 3b having an inner diameter that increases toward the opening side is formed at the end portion of the inner peripheral surface 3a of the pressing sleeve 3 that is located on the distal end side of the resin tube 1, and this taper surface 3b The maximum outer diameter is configured to be larger than the outer diameter of the expanded connecting pipe portion 1A after press-fitting.

  Although not shown in the drawings, the press-fitting device is made of resin with respect to a plurality of protrusions 9 formed on the pipe body and a pipe holding means for holding and fixing the end of the connecting pipe portion 1A of the resin pipe 1 from the radially outer side. Engagement means for a joint body that engages in a state where it can be pulled toward the connecting pipe portion 1A side of the pipe 1, and engagement for a sleeve that can be engaged with an end of the pressing sleeve 3 on the side away from the joint body B And a pulling means for relatively moving the engagement means for the sleeve and the engagement means for the sleeve and the engagement means for the joint body in the direction of the tube axis X. At the same time, the tube gripping means and the sleeve engaging means can be selectively replaced with respect to the pulling means.

  As shown in FIG. 3, the cylindrical connecting member 6 is configured in a cylindrical shape having a through hole (not shown) on the inner diameter side, and the outer peripheral surface 6 a in a cross-sectional view has a polygonal shape (in the present embodiment). (Refer to FIG. 3B), and the inner peripheral surface is screwed to the outer peripheral side threaded portion 60a formed on the outer peripheral surface of the tube portion 60 described above. A possible inner peripheral thread portion 6b is formed (see FIG. 3A). An annular projecting portion 10 that protrudes radially inward from the inner peripheral surface of the tubular connecting member 6 is formed at the end (tip portion) of the tubular connecting member 6. A plurality of cutout portions 10A (four in this embodiment) are formed at locations corresponding to the plurality of protrusions 9 formed at the distal end portion of the connecting cylinder portion 5.

Thereby, when the cylindrical connecting member 6 fitted to the joint main body B is moved from the connecting cylindrical portion 2 side to the connecting cylindrical portion 5 side along the tube axis X direction, the cylindrical connecting member 6 is used. A plurality of notches 10 </ b> A of the annular protrusion 10 are formed so as to be able to pass through a plurality of protrusions 9 at the tip of the connecting cylinder part 5, and the cylindrical connecting member 6 is further on the connecting flange 8 side of the connecting cylinder part 5. When moved, the annular projecting portion 10 abuts against the side surface of the connecting flange 8, and the annular projecting portion 10 (cylindrical connecting member 6) is configured not to be detached from the connecting tube portion 5.
That is, the inner diameter of the annular projecting portion 10 is larger than the outer diameter of the connecting cylinder portion 5 and smaller than the outer diameter of the connecting flange 8, and is the maximum of the notch portion 10 </ b> A of the annular projecting portion 10. The inner diameter is formed to be slightly larger than the outer diameter of the plurality of protrusions 9 of the joint body B. Further, the plurality of protrusions 9 and the plurality of cutout portions 10A are each formed in a substantially similar shape in a cross-sectional view, and each of the protrusions 9 and the cutout portions 10A is 4 in a state of being spaced at equal intervals (90 degrees in the present embodiment) in the circumferential direction. One by one. It should be noted that the corner of the tubular connecting member 6 where the inner peripheral side threaded portion 6b is formed and the annular projecting portion 10 is in contact with the proximal side surface of the annular projecting portion 10 projecting radially inward. A synthetic rubber O-ring 6 c that seals between the connection flange 8 of the joint body B and the inner peripheral surface of the cylindrical connection member 6 is disposed at a location where the connection is not performed.

  Next, a connection method for connecting the resin pipe 1 and the pipe portion 60 using the resin pipe joint W configured as described above will be described with reference to FIGS.

[1] As shown in FIG. 4, first, the joint body B and the tubular connecting member 6 described above are prepared, and the tubular connecting member 6 is externally fitted to the connecting tube portion 2 of the joint body B. And the cylindrical connection member 6 is moved from the connection cylinder part 2 side to the connection cylinder part 5 side along the pipe-axis X direction, and the annular protrusion part 10 of the cylindrical connection member 6 is made into the front-end | tip part of the connection cylinder part 5. The projections 9 are brought into contact with the plurality of projections 9 formed.

[2] After the cylindrical connecting member 6 is rotated around the tube axis X, the circumferential positions of the plurality of notches 10A of the annular protrusion 10 are aligned with the positions corresponding to the plurality of protrusions 9. The cylindrical connecting member 6 is further moved toward the connecting flange 8 along the tube axis X direction. Here, as shown in FIGS. 5 and 6, even when the plurality of notches 10 </ b> A and the plurality of protrusions 9 are located at positions where they overlap each other in the tube axis X direction, Since the position can be made to be completely coincident with the position in the circumferential direction of the plurality of protrusions 9, the tubular connecting member 6 is connected to the connecting tube portion without the annular protrusion 10 and the plurality of protrusions 9 being in contact with each other. It is possible to move reliably from the 2 side to the connecting cylinder part 5 side. Further, the cylindrical connecting member 6 that has moved to the connecting cylindrical portion 5 has a cylindrical shape because the annular protruding portion 10 of the cylindrical connecting member 6 can abut on the tip side surface of the connecting flange 8 in the tube axis X direction. Even when the connecting member 6 is further moved to the connecting flange 8 side of the connecting cylinder portion 5, the cylindrical connecting member 6 is not detached from the connecting cylinder portion 5, and the external fitting state can be maintained.

[3] Next, as shown in FIG. 7, after the pressing sleeve 3 is pre-packaged on a portion of the resin pipe 1 other than the connecting pipe portion 1 </ b> A, the cylindrical connecting member 6 is externally fitted to the connecting cylindrical portion 5. The fitting cylinder portion 4 of the joint body B is inserted into the end portion of the connecting tube portion 1A of the resin tube 1. Then, a pipe holding means (not shown) of a press-fitting device (not shown) is sheathed at the end of the connecting pipe 1A of the resin pipe 1, and the end of the connecting pipe 1A of the resin pipe 1 is radially outward. Clamp and fix while reducing the diameter from the side. Further, the engagement means (not shown) for the joint body is engaged with the protrusion 9 formed on the joint body B, and the pipe holding means and the engagement means for the joint body are brought together by the drawing means (not shown). Are moved relatively close to each other in the direction of the tube axis X, and the joint body B is drawn toward the connecting tube portion 1A side of the resin tube 1, and subsequently to the mounting tube portion 4 already inserted into the connecting tube portion 1A. The connecting tube portion 2 is press-fitted from the tube axis X direction. At this time, the connecting tube portion 1A of the resin tube 1 can be press-fitted while smoothly expanding and deforming by the tapered tube portion 2B formed in the region between the mounting tube portion 4 and the fitting connection tube portion 2A. . The end portion of the connecting pipe portion 1A of the resin pipe 1 is press-fitted until it comes into contact with the plurality of protrusions 9 of the connecting cylinder portion 5 of the joint body B.

[4] As shown in FIG. 8, after removing the tube holding means held and fixed to the end of the resin tube 1, an engaging means (not shown) for the sleeve is attached to the pressing sleeve 3. 3 and the outer end of the joint body B on the side away from the joint main body B (end face) is applied, and the engaging means for the sleeve and the engaging means for the joint main body are connected to the tube axis X by the drawing means (not shown). The pressing sleeve 3 is press-fitted in an externally fitted state from the tube axis X direction to the connecting pipe portion 1A of the resin pipe 1 after press-fitting. At this time, since the retaining protrusion 2a of the fitting connecting tube portion 2A constituting the connecting tube portion 2 bites into the inner peripheral surface 1a of the connecting tube portion 1A of the resin tube 1, the connecting tube portion 1A of the resin tube 1 is used. And the connection cylinder part 2 of the joint body B can be strongly prevented. The end portion of the pressing sleeve 3 is press-fitted until it comes into contact with the plurality of protrusions 9 of the connecting tube portion 5 of the joint body B. Thereafter, the engaging means for the sleeve, the engaging means for the joint body, and the pulling means are removed.

  As a result, as shown in FIG. 9, the connecting tube portion 2 of the joint body B is press-fitted into the connecting tube portion 1A of the resin tube 1, and the pressing sleeve 3 is removed from the connecting tube portion 1A into which the connecting tube portion 2 is press-fitted. The fitting main body B and the resin pipe 1 can be reliably connected in a state where the fitting main body B is fitted and the tubular connecting member 6 is externally fitted to the coupling main body B.

[5] Next, as shown in FIG. 10, the joint body B with the resin pipe 1 connected is moved in the direction of the tube axis X, and the base end side surface of the connecting flange 8 of the joint body B is attached to the sealing material. 7 is placed in contact with the end face of the pipe portion 60 of the on-off valve A. In this state, the cylindrical connecting member 6 is in a state of being externally fitted to the connecting cylinder portion 5 of the joint body B.

[6] Then, as shown in FIG. 11A, the cylindrical connecting member 6 that is externally fitted to the connecting cylindrical portion 5 of the joint body B is, for example, the outer peripheral surface 6 a of the cylindrical connecting member 6. A tool such as a spanner is applied and rotated so that the inner peripheral side threaded portion 6 b of the cylindrical connecting member 6 is screwed into the outer peripheral side threaded portion 60 a of the tube portion 60. At this time, the annular projecting portion 10 of the tubular connecting member 6 comes into contact with the distal end side surface of the connecting flange 8 from the tube axis X direction to be in a pressed state, and the proximal end side surface of the connecting flange 8 contacts the tube portion 60. The inner thread portion 6b is screwed into the outer thread portion 60a with a predetermined tightening torque until the pressing state is reached.

  As a result, the joint body can be surely secured by rotating only the cylindrical connecting member 6 fitted on the connecting cylinder portion 5 of the joint body B and screwing the inner peripheral side screw portion 6b and the outer peripheral side screw portion 60a. The connection flange 8 of B and the pipe part 60 can be connected. That is, the joint main body B and the pipe portion 60 are efficiently connected by a very simple and easy operation of rotating the tubular connecting member 6 without rotating the joint main body B and the resin pipe 1 which is a longitudinal member. can do. In addition, the annular projecting portion 10 of the cylindrical connecting member 6 and the annular connecting flange 8 of the joint body B come into contact with each other in a surface contact state, and further, the connecting flange 8 and the pipe portion 60 are in contact with each other by surface contact. Since it is in a contact and pressed state, it is pressed so as not to cause uneven pressure in the circumferential direction with a large contact area, and the tightening state between the connecting flange 8 and the tube portion 60 is made as uniform as possible in the circumferential direction, and tightened more securely. The state can be stabilized, and fluid leakage between the annular projecting portion 10 and the connecting flange 8 and thus between the connecting flange 8 and the pipe portion 60 can be more reliably prevented.

  Therefore, according to the joint W for resin pipes of the present invention, the connection between the resin pipe 1 and the pipe portion 60 of the fluid piping system can be reliably prevented from leaking fluid while being simple in structure, and can be easily performed efficiently. Can be done.

[Another embodiment]
( 1 ) In the above-described embodiment, the pressing sleeve 3 is press-fitted from the tube axis X direction into the connecting tube portion 1A of the resin tube 1 after press-fitting, but this pressing sleeve 3 is inserted in the circumferential direction. A split sleeve body divided into a plurality of parts and a connecting means for tightening and connecting the plurality of split sleeve bodies to the reduced diameter side, and a plurality of the divided sleeve bodies accompanying the tightening operation of the connecting means are moved by reducing the diameter. You may comprise so that it may press from the radial direction outer side with respect to 1 A of connecting pipe parts after press injection.

( 2 ) In the above-described embodiment, the plurality of protrusions 9 and the plurality of cutout portions 10A are provided at equal intervals in the circumferential direction. However, in the state where the cylindrical connecting member 6 is externally fitted to the joint body B, When the plurality of notches 10 </ b> A of the annular projecting portion 10 can pass through the plurality of protrusions 9 of the connecting tube portion 5 when moved from the connecting tube portion 2 side to the connecting tube portion 5 side in the axis X direction. For example, the number, the arrangement in the circumferential direction, the shape, and the like can be employed without any particular limitation.

( 3 ) In the above-described embodiment, the branch pipe part 51 branched from the fluid pipe 50 is used as a pipe part of the fluid piping system that is a target to which the resin pipe 1 is connected (a target to which the connection flange 8 of the joint body B is connected). In the on-off valve A provided with one end side, the pipe portion 60 formed on the other end side of the on-off valve A has been described as an example. That is, the configuration has been described in which the fluid pipe 50 can be connected to the resin pipe 1 in an uninterrupted state if the on-off valve A is closed. However, the pipe part of the fluid piping system to which the resin pipe 1 is connected is not limited to the pipe part 60. For example, the resin pipe in a water-stopped state in the pipe part of the fluid piping system that does not include an on-off valve. Various pipe parts, such as when connecting 1, can be targeted.

  The present invention is a good joint for a resin pipe that can reliably prevent leakage of fluid while having a simple configuration and connecting the resin pipe to the pipe portion of the fluid piping system, and that can be performed efficiently and easily. Can be used.

B Joint body X Pipe core W Resin pipe joint 1 Resin pipe 1A Connecting pipe (resin pipe)
1a Inner peripheral surface 2 Connection cylinder (joint body)
2A Fitting connection cylinder (connection cylinder)
2B Tapered tube (connecting tube)
2a Locking projection 3 Pressing sleeve 3a Inner peripheral surface 3b Tapered surface 4 Attaching cylinder part (connection cylinder part)
5 Connecting cylinder (joint body)
6 cylindrical connecting member 6a outer peripheral surface 6b inner peripheral side threaded portion (inner peripheral surface)
8 Connection flange (connection cylinder)
9 Protrusion 10 Annular protrusion
10A Notch (annular protrusion)
50 Fluid pipe (fluid piping system)
60 Pipe (Fluid piping system pipe)
60a Outer peripheral side thread (outer peripheral surface)

Claims (7)

A joint body provided with a connecting tube portion that can be press-fitted into the connecting tube portion of the resin tube from the tube axis direction, and a connecting tube portion having a larger diameter than the connecting tube portion, and the connecting tube in which the connecting tube portion is press-fitted A pressing sleeve that presses the portion from the radially outer side, and a joint for a resin pipe that connects the connecting cylinder portion and the pipe portion of the fluid piping system,
A connecting flange projecting radially outward is integrally formed at the base end portion of the connecting tube portion,
A cylindrical connecting member fitted over the connecting cylindrical portion, and an inner peripheral threaded portion that can be screwed to an outer peripheral threaded portion of the tube portion is formed on the inner peripheral surface of the cylindrical connecting member; An annular projecting portion projecting radially inward from the inner peripheral surface is formed at the end of the cylindrical connecting member, and the inner peripheral side thread portion of the cylindrical connecting member is connected to the outer peripheral side screw of the tube portion. A structure in which the connecting flange and the pipe part are connected in a pressed state in which the annular projecting part is brought into contact with the connecting flange at the base end part of the connecting cylinder part from the pipe axis direction by being screwed to the part. so,
Projections having a diameter larger than the inner diameter of the annular projecting portion and smaller than the inner diameter of the cylindrical connecting member are integrally formed radially outward at a plurality of circumferential positions at the distal end portion of the connecting cylindrical portion. Protruding and formed
In the annular projecting portion, a plurality of cutout portions are formed at positions corresponding to the plurality of protrusions formed at the distal end portion of the connecting cylinder portion, and the cylindrical connecting member is in a state of being externally fitted to the joint body. Are moved from the connecting tube portion side to the connecting tube portion side along the tube axis direction, the plurality of notches of the tubular connecting member are the plurality of protrusions at the tip of the connecting tube portion. A joint for resin pipes formed so that it can pass through .   The joint for resin pipes according to claim 1 in which contact of said annular projection and said connection flange is contact by surface contact. The joint for resin pipes according to claim 1 or 2 , wherein the plurality of protrusions and the plurality of notches are provided at three or more locations at equal intervals in the circumferential direction. The joint for resin pipes as described in any one of Claims 1-3 in which the outer peripheral surface of the said cylindrical connection member is provided with a polygonal cross section by a cross sectional view. The end portion of the connecting tube portion that is reduced in diameter by the holding and fixing action of the tube holding means of the press-fitting device that holds and fixes the end portion of the connecting tube portion from the radially outer side to the distal end portion of the connecting tube portion. It can receiving the inner circumferential surface of the side, and, according to claim 1-4 in which the hollow mounting portion formed in a straight tubular or substantially straight tube with an outer diameter made smaller than the inner diameter of the connecting pipe portion is formed The joint for resin pipes as described in any one. In order from the distal end portion to the proximal end portion of the connection tube portion, the connection tube portion, the tapered tube portion that guides the diameter of the connection tube portion, and the inner peripheral surface of the connection tube portion The joint for resin pipes according to claim 5 , comprising a plurality of retaining protrusions that can bite into the tube and a fitting connection cylinder portion projecting at intervals in the tube axis direction. It is the connection method using the joint for resin pipes as described in any one of Claims 1-6,
The cylindrical connecting member is externally fitted to the connecting cylindrical portion, and the cylindrical connecting member is rotated around a tube axis so that the circumferential positions of the plurality of notches in the annular projecting portion are the plurality of protrusions. The cylindrical connecting member is moved from the connecting tube portion side to the connecting tube portion side along the tube axis direction in a state in which the plurality of cutout portions pass through the plurality of protrusions. And then press-fitting the connecting tube portion into the connecting tube portion from the axial direction of the tube, and the connecting tube portion in which the connecting tube portion is press-fitted in the state where the pressing sleeve is previously sheathed on the resin tube. The joint body in a state where the resin pipe is connected is press-fitted from the pipe axis direction into the pipe axis direction, and then the joint body in a state where the resin pipe is connected is moved in the pipe axis direction, and the proximal side surface of the coupling flange of the joint body In contact with the end face of the pipe part with a sealant interposed A joint for a resin tube, wherein the tubular connecting member externally fitted to the connecting tubular portion is rotated, and the inner peripheral side threaded portion of the tubular connecting member is screwed to the outer peripheral side threaded portion of the tubular portion. Linking method using

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