JP2007321836A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint for preventing the movement of a pipe (a connection pipe) with the push-in (movement) of a push ring during the push-in (movement) of the push ring to a joint body. <P>SOLUTION: After the connection pipe 10 is inserted into the pipe joint 1, when the push ring 3 is moved into the joint body 2, an locking member 9 (a wedged protrusion 91) incorporated in a holding member 5 abutting on the push ring 3 is locked to an outer peripheral face 10b of the connection pipe 10 and the holding member 5 abutting on the push ring 3 is moved to the side of the joint body 2 with an oblong hole portion 51 of the holding member 5, longer than the locking member 9, passing through the locking member 9. With the movement of the push ring 3, the locking member 9 in the holding member 5 is moved to the radial direction of a through-hole 21 and the holding member 5 is moved along the through-hole 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint used for connecting a stainless steel pipe or the like for water supply or hot water supply at a construction site.

  With respect to conventional pipe joints, the structures shown in FIGS. 18 to 21 are disclosed. In FIG. 18, a press-type pipe joint is disclosed. A press-type pipe joint F shown in FIG. 18 has widened receiving ports 201 and 201 into which connection pipes P and P can be inserted at both ends of a stainless steel pipe, and an O-ring 205 in annular grooves 203 and 203. 205 are attached. Pressure sensitive coloring tapes 207 and 207 are attached to the outer circumferences of the receiving ports 201 and 201 at locations to be caulked by a press tool (large electric tool) T. Then, the identification color is developed by the pressure when tightened by the press tool T. As shown in FIG. 18, the press tool T is caulked to a hexagonal shape or octagonal shape with upper and lower metal fittings 202, 202, and six or eight or more surfaces are formed by caulking projections 204, 204 on the inner periphery. The identification color appears in (Patent Document 1).

  Next, in the mechanical pipe joint shown in FIG. 19, the nut 312 and the sliding member 320 are fitted to the stainless steel pipe 301, and the pipe diameter is increased slightly inward from the pipe end of the stainless steel pipe 301. Processing is performed to form an annular protrusion 302 having a circular arc cross section. When forming the annular projecting portion 302 by the tube expansion process, an annular rubber tube expansion member is inserted inside the end portion of the stainless steel tube 301 and the tube expansion member is expanded in the outer peripheral direction, so that the stainless steel tube 301 is uniform. The tube is expanded by pressure. Next, the female threaded portion 316 of the nut 312 is screwed into the male threaded portion 309 of the joint body 303, and the nut 312 is tightened together with the sliding member 320 using a tool as shown in FIG. The O-ring 308 is compressed between the pipe end side portion 302 and the bottom of the housing recess 307 of the joint main body 303, and the joint main body 303 and the stainless steel pipe 301 are connected in a sealed state (Patent Document 2).

  Next, in FIG. 21, for the connection between the pipe joint and the connected pipe 405, the male threaded portion 407 of the retainer 402 is screwed into the tapered female threaded portion 406 of the joint body 401, and the male threaded portion 407 of the retainer 402 and the connected pipe 405 are connected. The retainer 402 is screwed in between and is screwed in until the joint body 401 comes into contact with the end surface of the outer flange portion 415. At this time, the inner top portion 425 of the outer peripheral edge 418 of the plurality of small disks 404 embedded in the retainer 402 bites into the outer peripheral surface 422 of the connected pipe 405 by the screwing of the retainer 402, and a spiral biting trace 423 is formed and the connected pipe 405 is temporarily fixed firmly. Further, when the retainer 402 is screwed, the tip 424 presses the sealing material 403 toward the first stepped portion 410 side of the joint body 401, whereby the joint body 401, the connected pipe 405, and the retainer 402 are mutually connected. Is sealed (Patent Document 3).

JP 2004-84713 (paragraphs 0012, 0022 and 0023 FIG. 1) JP 2002-228062 (paragraphs 0014, 0021 and 0023 FIGS. 1 and 2) Japanese Patent Laid-Open No. 10-231967 (paragraph 0019 to paragraph 0023 FIG. 4)

  However, in the press-type pipe joint F shown in FIG. 18, the structure of the pipe joint F itself is simple, but piping work can be performed by caulking the receiving holes 201 and 201 with a dedicated press tool (large electric tool). Since it is carried out, a dedicated press tool (large electric tool) for caulking the receptacles 201 and 201 is required. There is also a concern that the operator forgets the caulking process. Therefore, as shown above, pressure-sensitive color-developing tapes 207 and 207 coated with pressure-sensitive color-developing paint are coated on the caulked portions of the receiving holes 201 and 201, and caulked with a dedicated press tool (large electric tool). There are cases where a special mechanism is provided such as discriminating power depending on the pressure of time. However, even in this case, when the construction worker does not perform the caulking process and does not confirm the identification, since the so-called fail-safe function is not provided, the fluid pressure is applied to the connection pipes P and P. When applied, there is a risk of causing an accident that the connecting pipes P, P come out and a large amount of fluid is discharged.

  Further, according to the pipe expansion type pipe joint shown in FIGS. 19 and 20, the end of the stainless steel pipe 301 is expanded with a dedicated tool (large electric tool) to form the annular protrusion 302, and this stainless steel pipe 301 is inserted into the joint main body 303 in which the O-ring 308 is accommodated, and then the nut 312 is tightened, and the O-ring 308 is compressed by the stainless steel pipe 301 by the annular protrusion 302, so that the piping work is performed. Power tools), and the piping process is complicated. In addition, before the nut 312 is screwed into the joint body 303, it is necessary to perform pipe expansion processing on the end portion of the stainless steel pipe 301, which leads to a long piping work.

  Further, even if the nut 312 is not sufficiently tightened, the O-ring 308 may temporarily connect the joint body 303 and the stainless steel pipe 301 to prevent water leakage (or air leakage). Therefore, even if the nut 312 is insufficiently tightened in the water pressure test (or atmospheric pressure test) for confirming whether the construction has been reliably completed after the piping construction, water leakage due to provisional connection by the O-ring 308. (Or air leakage) is prevented, and forgetting to tighten the nut 312 cannot be found. Therefore, if there is no problem in the water pressure test (or atmospheric pressure test), water or the like (or air) is allowed to flow through the pipe (stainless steel pipe 301) as it is, and water leakage (or atmospheric pressure) is applied to the pipe joint to cause water leakage ( Alternatively, air leakage may occur.

  Furthermore, even in the pipe joint shown in FIG. 21, the retainer 402 is forgotten to be tightened, which is not detected by the water pressure (or atmospheric pressure) test, and the connected pipe 405 comes out after the completion of the piping construction, resulting in a large water leak. There is. Further, the burr at the tip of the connected pipe 405 has a minute scratch on the sealing material 403, and the leakage of water (or air) due to the scratch cannot be detected by the water pressure test (or atmospheric pressure test). Water leakage (or air leakage) may occur over time.

  In order to solve the problem of preventing water leakage (or air leakage) by detecting water pressure (or atmospheric pressure) even in the pipe joint shown in FIGS. There is a pipe joint 101 shown in FIG. In FIG. 22, after the seal member 104, the movable member 105, the elastic member 106, the inner collar 107 and the retaining member 108, and the push wheel 103 are installed in the joint body 102, the connection pipe 111 is inserted, The end surface is brought into contact with the inner peripheral side end surface of the ring portion 153 of the movable member 105.

  At this time, the retaining member 108 moves toward the center of the joint body 102 while being expanded along the tapered portion 132 of the pusher wheel 103, and the wedge-shaped protrusion 181 is locked to the connecting pipe 111. In the pipe joint 101 in this state, since the seal member 104 is not compressed, minute water leakage can be detected by a water pressure test. That is, even if there is a construction failure in which the push wheel 103 is forgotten to be pushed by a predetermined amount, it can be detected in advance by a water pressure test, and problems such as water leakage can be prevented.

  However, in this pipe joint 101, the connection pipe 111 is moved toward the joint body 101 by pushing the push wheel 103. Therefore, the movable member 105 is divided into the neck portion of the flange portion 151 and the ring portion 153 by pushing the push wheel 103, the seal member 104 is brought into contact with the outer peripheral surface of the connection pipe 111, and the seal surface pressure is applied by the seal member 104. While forming, the connection tube 111 is drawn toward the joint body 102 and moves (hereinafter referred to as joint displacement) in a state where the wedge-shaped protrusion 181 of the retaining member 108 is locked to the outer peripheral surface of the connection tube 111.

  Moreover, when it constructs with the some pipe joint 101 in a joint displacement state, as shown in FIG. 23, the inter-surface dimension (Lp1) between the pipe joints of the temporary assembly state which inserted the connection pipe 111 in the pipe joint 101, The difference in the inter-surface dimension (Lp2) after construction that pushes the push wheel 103 becomes large, and it is difficult to use it except at the construction site where the movement of the pipe (connecting pipe 111) is allowed. That is, in such a construction site, it is necessary to prepare the pipe (connection pipe 111) in anticipation of the length of the joint (piping pipe 111) slipping together for piping, so the piping construction process is complicated. I have to be.

  Therefore, it is desirable that the joint pipe length inserted into the joint is the same in the respective construction states when the connection pipe is inserted and when the press ring is pressed to prevent this joint displacement. However, in the structure that prevents this joint displacement, the retaining member 108 is pressed against the connecting pipe 111 on the inner peripheral side of the tapered portion 132 of the pusher wheel 103 when the pusher wheel 103 is pushed into the joint body 102 side. However, there is a tendency that the insertion load of the pusher wheel 103 is increased due to the fact that it is not efficiently pressed against the outer peripheral surface of the connection pipe 111 in the pipe radial direction. That is, the structure that eliminates the joint displacement state is a structure in which the end surface 111a of the connection pipe 111 reaches the flange wall of the joint body 102 to be reached when the connection pipe 111 is inserted (in the temporarily assembled state) without using the pusher wheel 103. In some cases, there has been a problem that the insertion load of the push wheel 103 is further increased.

  The present invention has been made in view of the above circumstances, and enables connection of a pipe (connection pipe) without causing a joint displacement that causes the pipe (connection pipe) to move by moving a push wheel. An object of the present invention is to provide a pipe joint capable of efficiently pressing a push ring in the pipe radial direction.

  In order to achieve the above object, the invention according to claim 1 is a joint body having a through hole through which a fluid flows, a connection pipe inserted into the through hole, and a seal for sealing the joint body. A retaining member that is pressed against an outer peripheral surface of the connection pipe by the movement of the pusher wheel, and a retaining member that is attached to the joint body so as to be movable in the axial direction of the through hole. And the retaining member is held movably relative to the retaining member in the direction of movement of the push wheel.

  Therefore, according to the first aspect of the present invention, the retaining member is held so as to be relatively movable with respect to the holding member in the direction of movement of the pusher wheel. Is pressed in the radial direction and the holding member is pressed to move toward the joint body, and the wedge-shaped projections of the retaining member are locked to the outer peripheral surface of the connecting pipe by the pressing on the retaining member. By pressing the member, the holding member moves (moves toward the joint body), presses the seal member, and enables the connection between the joint body and the connecting pipe.

  The invention described in claim 2 is characterized in that, in addition to the configuration described in claim 1, the inner peripheral surface of the push ring forms a tapered surface whose diameter increases toward the joint body.

  Therefore, according to the second aspect of the present invention, since the tapered surface is formed on the inner diameter side of the press ring with the diameter increasing toward the joint body side, the press ring is pressed (moved) so as to abut on the press ring. Since the pressure is applied to the retaining member (the back surface portion) along the tapered surface, it is possible to increase the pressure on the retaining member, and the retaining member is firmly locked to the outer peripheral surface of the connecting pipe. .

  Furthermore, in addition to the structure of Claim 1 or 2, invention of Claim 3 is the said retaining member which extends in the axial direction of the said holding member, and penetrates to the radial direction of the said holding member in the said holding member. A hole for incorporating the member is provided so as to face the inner peripheral surface of the push wheel.

  Therefore, according to the third aspect of the present invention, the holding member is inserted with a hole extending in the axial direction of the holding member and passing through the holding member in the radial direction for incorporating the retaining member. The retaining member can be protruded from the holding member so as to face the connecting pipe, and the wedge-shaped protrusion, which is a part of the protruding retaining member, is pressed on the outer peripheral surface of the connecting pipe by the pressing of the inner peripheral surface of the pressing wheel by the movement of the pressing wheel. It becomes possible to lock.

  According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, the hole provided in the holding member is formed by the hole of the holding member when the retaining member is incorporated. A gap is formed along the moving direction.

  Therefore, according to the invention described in claim 4, the hole provided in the holding member has a retaining member (so that a gap is formed along the moving direction of the retaining member when the retaining member is incorporated. Therefore, only the holding member can be moved in a state in which the retaining member is incorporated in the hole and the retaining member is locked to the connecting pipe.

  Furthermore, in the invention according to claim 5, in addition to the structure according to any one of claims 1 to 4, the push wheel moves toward the joint body, and the retaining member is locked to the outer peripheral surface of the connection pipe. Then, the hole passes through the retaining member, and the gap in the hole moves.

  Therefore, according to the fifth aspect of the present invention, the press ring moves toward the joint body, the retaining member in the hole is locked to the outer peripheral surface of the connection pipe, and the hole of the holding member is retained by the movement of the push ring. And the side surface in the hole portion passes through the retaining member, so that the retaining member incorporated in the retaining member can be prevented from moving even if the retaining member moves.

  According to a sixth aspect of the present invention, in addition to the structure of any of the first to fifth aspects, the hole is provided with means for preventing the retaining member from falling off.

  Therefore, according to the invention described in claim 6, since the retaining member is provided with the retaining member in the hole of the holding member, when the retaining member is assembled in the hole and incorporated in the pipe joint (in the joint body). In addition, it is possible to prevent the retaining member from falling to the through hole side (to the inner diameter side).

  Furthermore, in the invention described in claim 7, in addition to the structure described in claim 6, the drop-off preventing means is a protrusion formed on at least one of the surface portions of the hole portion along the moving direction of the holding member. It is characterized by being.

  Therefore, according to the seventh aspect of the present invention, the drop-off prevention means is provided as a protruding portion on at least one of the side surfaces of the hole along the moving direction of the holding member. It is possible to support the side surface of the retaining member facing the surface portion (side surface) along the direction, and to prevent the retaining member from falling from the hole portion toward the through hole side (to the inner diameter side).

  According to an eighth aspect of the present invention, in addition to the configuration according to any of the first to seventh aspects, the pusher wheel is attached to the joint body so as to be slidable in the axial direction of the through hole. Features.

  Therefore, according to the eighth aspect of the present invention, the inner peripheral surface of the joint body and the outer peripheral surface of the press ring can be fitted, and the groove portion is formed on the inner peripheral surface of the joint main body and the outer peripheral surface of the press wheel. A stopper, for example, a stop ring, is incorporated in the groove, and the outer peripheral surface of the press ring is slid with respect to the inner peripheral surface of the joint body. By adopting a simple structure in which the groove portions on the outer peripheral surface are overlapped and a stop ring is fitted between the groove portions, it is possible to fix the joint body and the press ring excellent in assembling and workability.

  Furthermore, the invention according to claim 9 is characterized in that, in addition to the structure according to any one of claims 1 to 7, the push wheel is attached to the joint body by screwing.

  Therefore, according to the ninth aspect of the present invention, the screw groove provided on the outer peripheral surface of the joint body and the screw groove provided on the outer peripheral surface of the press ring are screwed together and screwed to advance the joint main body and the press ring. The joint body and the press ring can be fixed with a general-purpose tool (spanner, monkey, etc.), and the press ring in the through-hole direction (axial direction) can be moved by screwing the press ring. Since the propulsive force is obtained, the construction for fixing can be completed with a small force.

  According to the present invention, after the pipe (connection pipe) is inserted into the joint body, the retaining ring moves in the radial direction of the pipe (connection pipe) by moving the push wheel (by pushing in), and the outer periphery of the pipe (connection pipe). The retaining member that is locked to the surface and incorporates the retaining member moves in the direction of movement of the pusher wheel, so that the retaining member and the retaining member can move independently. It is possible to prevent the joint slip phenomenon that the connecting pipe) moves toward the joint body. As a result, the insertion load of the press ring does not increase, and the retaining member can efficiently bite in the pipe diameter direction with a low load, and the construction for fixing the press ring to the joint body can be completed. Further, since there is no movement of the pipe (connection pipe) due to the movement of the push wheel, it is not necessary to allow for the length of the joint displacement, and there is no restriction on the construction site by allowing for the length of the joint displacement.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Example 1)
FIG. 1 shows a pipe joint 1 which is Example 1 of the present invention. The outer side of the joint body 2 of the pipe joint 1 shown in FIG. 1 is provided with a stepped portion 2c at the approximate center in the longitudinal direction, and there is a slight step from one end 2a to the stepped portion 2c, but a substantially constant diameter. The outer peripheral surface 2e is formed, and the diameter from the step 2c to the other end 2b is smaller than the diameter from the one end 2a to the step 2c. The outer peripheral surface 2g is formed with a certain diameter by a certain length from the step portion 2c to the other end portion 2b, passes through the inclined surface 2d, and has a constant diameter smaller than the diameter from the step portion 2c to the inclined surface 2d. A tapered male screw 2f is formed from the inclined surface 2d to the other end 2b.

  The inside of the joint body 2 is provided with a through hole 21 penetrating from one end 2a to the other end 2b along the longitudinal direction of the joint body 2 to form a cylindrical shape. In the joint body 2, a plurality of steps are provided along the longitudinal direction of the joint body 2. A first step 22 having a constant diameter is formed from one end 2 a of the joint body 2 along the longitudinal direction of the joint body 2. The first step portion 22 is provided with a tapered circumferential groove 22a in the vicinity of one end portion 2a, and the tapered circumferential groove 22a has a taper that expands toward one end portion 2a. A surface 22a1 is provided. A tapered circumferential groove 22b is also provided at substantially the center of the first step portion 22, and similarly, the tapered circumferential groove 22b has a tapered surface 22b1 whose diameter increases toward one end 2a. Is provided.

  Adjacent to the first step portion 22, a second step portion 23 having a constant diameter is formed along the longitudinal direction of the joint body 2 from the end surface 22 c of the first step portion 22. As shown in FIG. 1, the second step portion 23 is smaller in diameter than the first step portion 22 and shorter in length than the first step portion 22. Adjacent to the second step portion 23, a third step portion 24 having a constant diameter is formed along the longitudinal direction of the joint body 2 from the end surface 23 a of the second step portion 23. In the third step portion 24, an inclined surface 24 a is provided from the end surface 23 a of the second step portion 23 to the third step portion 24. As shown in FIG. 1, the inclined surface 24 a is provided so as to increase in diameter from the third step portion 24 toward the second step portion 23. Further, on the end surface 24 b side of the third step portion 24, an inclined surface 24 c that increases in diameter from the end surface 24 b toward the third step portion 24 is provided.

  And the 4th step part 25 with the fixed diameter is formed along the longitudinal direction of the coupling main body 2 from the end surface 24b of the 3rd step part 24 adjacent to the 3rd step part 24. As shown in FIG. As shown in FIG. 1, the fourth step portion 25 has a smaller diameter than the third step portion 24 and is longer than the third step portion 24. As described above, the inside of the joint body 2 includes the first step portion 22, the second step portion 23, the third step portion 24, and the fourth step portion from one end 2a to the other end 2b. 25 is formed, and the diameters of the step portions 22, 23, 24, 25 are reduced from one end portion 2a to the other end portion 2b. In this example, since the joint body 2 requires corrosion resistance and rigidity, it is formed by a precision casting method using an SCS material (SCS 13 corresponding to SUS304). However, the joint body 2 can also be formed by a precision casting method using a bronze material.

  In the joint body 2, first, as shown in FIG. 1, an O-ring 4 that is a seal member is incorporated in the second step portion 23. As shown in FIG. 1, the O-ring 4 is incorporated so as to abut (contact) the second step portion 23 and the end surface 23a. In this example, the O-ring 4 which is a seal member is formed of olefin rubber. The O-ring 4 is preferably formed of EPDM, which is a terpolymer of ethylene, propylene and a diene monomer for crosslinking, which is particularly excellent in heat resistance, other than olefin rubber. It can also be formed of FKM (fluoro rubber) which is excellent in properties.

  Next, a sleeve 6 is incorporated in the joint body 2 adjacent to the O-ring 4. As shown in FIG. 1, the sleeve 6 has a substantially frustum shape, and the sleeve 6 is assembled so that the diameter-reducing side (the sleeve portion 62 side) of the sleeve 6 faces the one end 2 a of the joint body 2. It is. The sleeve 6 includes a support portion 61 and a sleeve portion 62. In order to support the inside of the O-ring 4, the support portion 61 is formed with a recess 61 a having a substantially arc-shaped cross section along the shape of the O-ring 4 along the outer peripheral surface of the support portion 61. A plurality of slits 62 a are formed in the direction of the through hole 21 in the sleeve portion 62 that is continuous with the support portion 61.

  The sleeve 6 is incorporated into the joint body 2, and the concave portion 61 a of the support portion 61 of the sleeve 6 comes into contact with the inner diameter side 4 a of the O-ring 4. At this time, in this example, as shown in FIG. 1, the sleeve 6 is incorporated at a position over the first step portion 22 and the second step portion 23 in the joint body 2. Next, a movable member 7 is incorporated in the joint body 2 adjacent to the sleeve 6. As shown in FIG. 1, the movable member 7 is a ring-shaped member, and is incorporated so that the outer peripheral surface 72 of the movable member 7 can move along the first step portion 22. A protrusion 71 is formed on the inner diameter side of the movable member 7, and this protrusion 71 enters the inner peripheral side of the sleeve portion 62 of the sleeve 6, so that the movable member 7 is stable with respect to the sleeve 6 (not wobbled). ) And abuts against the sleeve 6 and is incorporated in the joint body 2.

  In this example, in order to stabilize the movable member 7 with respect to the sleeve 6, the protrusion 71 is formed on the inner diameter side of the movable member 7, but in order to stabilize the movable member 7 with respect to the sleeve 6, the protrusion 71 is provided. It is not limited to providing. In this example, the movable member 7 is made of polyolefin. However, the movable member 7 is not limited to this, and can be used as the material of the movable member 7 as long as it is a crosslinked PE or the like. Moreover, the movable part member 7 can also be a metal or a composite material of a metal and a resin.

  Next, in the joint body 2, the elastic member 8 is incorporated in the first step portion 22 adjacent to the movable member 7. In this example, as shown in FIG. 1, a substantially frustoconical coil spring 8 (compression coil spring) is used as the elastic member 8. The coil spring 8 has a substantially truncated cone shape formed by winding a wire rod so that the outer diameter increases from one end to the other end. In this example, the side of the coil spring 8 on which the diameter is reduced (small diameter side 8 a) is incorporated toward one end 2 a of the joint body 2. In other words, the coil spring 8 is incorporated so that the diameter expansion side (large diameter side 8 b) is in contact with the flat surface portion 73 of the movable member 7.

  However, it is also possible to incorporate the small diameter side 8a of the coil spring 8 so as to contact the flat surface portion 73 of the movable member 7. In this example, the substantially frustoconical coil spring 8 is used as the elastic member 8 as described above. However, if the movable member 7 can be pressed, it is limited to the substantially frustoconical coil spring 8. Absent. In this example, the coil spring 8 is made of austenitic stainless steel (SUS304), but the coil spring 8 is not limited to being made of austenitic stainless steel (SUS304).

  Further, in the joint body 2, the stop ring 11 as the stopper 11 is incorporated in the tapered circumferential groove 22a of the first step portion 22 so that a part thereof protrudes from the tapered circumferential groove 22a. . The stop ring 11 used in this example is made of austenitic stainless steel (SUS304), but is not particularly limited to austenitic stainless steel (SUS304).

  Next, a push ring 3, which is a cylindrical member, is incorporated into the joint body 2 from one end 2 a of the joint body 2. As shown in FIG. 1, an outer peripheral surface 3 a having a certain diameter is formed on the side of the pusher wheel 3 to be assembled into the joint main body 2 so as to be able to engage with the inner peripheral surface (first step portion 22) of the joint main body 2. Yes. An outer peripheral surface 3b having a constant diameter is formed through a slight step from the outer peripheral surface 3a, and an outer peripheral surface 3c having a constant diameter is formed through a step. That is, the outer diameter of the pusher wheel 3 decreases from the outer peripheral surface 3a toward the outer peripheral surface 3c. Further, a circumferential groove 31 is formed on the outer peripheral surface 3a of the pusher wheel 3 so that the stop ring 11 can enter. In FIG. 1, a part of the stop ring 11 that protrudes from the tapered circumferential groove 22 a in the joint body 2 is in a circumferential groove 31 of the push ring 3.

  The pusher wheel 3 is provided with a through-hole 35 penetrating from one end 3d to the other end 3e along the longitudinal direction of the pusher 3, and has a cylindrical shape. The inner peripheral surface 3f of the pusher wheel 3 forms a tapered surface 32 that expands in the direction from one end 3d to the other end 3e of the pusher wheel 3 (tapered surface that expands toward the joint body side). 32). In this example, the pusher wheel 3 is made of an SCS material by a precision casting technique. The press ring 3 also needs to have corrosion resistance and rigidity like the joint body 2, so that it is formed by a plastic working technique such as hot forging, cold forging or press forming with austenitic stainless steel in addition to the SCS material. Can do. The material of the push ring is not limited to metal, and may be resin as long as it has a sufficient thickness (rigidity), or may be a composite of metal and resin.

  A retaining member 9 and a holding member 5 that supports the retaining member 9 are incorporated in the pusher wheel 3. As shown in FIG. 2, the holding member 5 is a cylindrical member and has a substantially truncated cone shape. In the direction from one end 5 a of the holding member 5 to the other end 5 b, An outer peripheral surface (tapered surface 5c) is formed to increase the diameter. The substantially frustoconical tapered surface 5 c of the holding member 5 has substantially the same inclination as the tapered surface 32 in the pusher wheel 3. Therefore, the holding member 5 can be incorporated into the pusher wheel 3.

  As shown in FIG. 1, the holding member 5 is a long hole through which the tapered surface 5 c and the inner peripheral surface penetrate as shown in FIG. 4 along the axial (through hole 21) direction so that the retaining member 9 is incorporated. A portion (hole) 51 is formed. As shown in FIGS. 2 to 4, the long hole portion 51 extends in the axial (through hole 21) direction of the holding member 5, penetrates in the radial direction, and extends in the axial (through hole 21) direction (of the connecting pipe 10. (In a direction along the outer peripheral surface 10b), the retaining member 9 can be incorporated. Specifically, as shown in FIGS. 3 and 4, the long hole portion 51 extends from the one end portion 5 a side of the holding member 5 to the vicinity of the other end portion 5 b side. The long hole portion 51 is longer than the retaining member 9 (longitudinal direction thereof), and when the retaining member 9 is incorporated into the long hole portion 51, the long hole portion 51 extends into the long hole portion 51 along the moving direction of the holding member 5. A gap is formed. In this example, as shown in FIG. 5, the long hole portions 51 are provided at three locations along the axis (through hole 21) direction of the holding member 5. In this example, both end portions in the longitudinal direction of the long hole portion 51 are closed, but a slit shape in which one end in the longitudinal direction is open may be used.

  However, it is not limited to these three places shown in this example, and at least one place may be provided. For example, four places, six places, etc. can be provided. Further, the length of the long hole portion 51 (the length along the axis (through hole 21) direction) is at least the effective length of the retaining member 9 incorporated in the long hole portion 51 (the tube locking side edge tube length). It needs to be longer.

  In the long hole portion 51, as shown in FIG. 1, drop-off preventing means for holding the retaining member 9 incorporated in the long hole portion 51 is provided. The holding portion 52 which is a drop-off prevention means forms a projection 52 and prevents the drop-off member 9 from dropping toward the inner diameter side of the hold-down member 5 when the holding member 9 is assembled to the holding member 5. Yes. As shown in FIGS. 3 to 5, the protrusion 52 is provided at the approximate center of the side surfaces 55 and 55 of the long hole portion 51. As shown in FIGS. 3 and 5, the protrusion 52 is formed so as to slightly protrude from the side surfaces 55, 55, and is a nail that can be engaged with the front portion 93 of the retaining member 9 as shown in FIG. 4. It has a shape. The drop-off prevention means is not limited to the above, and a taper surface may be formed on the opposite side surfaces of the retaining member 9 and the long hole portion 51 to form the drop-off prevention means.

  However, as long as the retaining member 9 can be held in the holding member 5, the protrusion 52 is not limited to being formed in a claw shape at the approximate center of the side surfaces 55, 55 of the long hole portion 51 as in this example. Further, in this example, the protrusion 52 is provided on both side surfaces 55, 55 of the long hole portion 51, but it can be similarly provided on either one of the side surfaces (surface portions) 55 from the holding member 5 of the retaining member 9. Can be prevented from falling off.

  In this example, the holding member 5 is formed of general-purpose engineering plastic POM (polyacetal). However, the holding member 5 is not limited to POM (polyacetal), and other general-purpose engineering plastics can also be used. It can also be formed of special engineering plastics such as PPS (polyphenylene sulfide) having excellent heat resistance.

  In FIG. 1, the protrusion 52 provided on the long hole 51 of the retaining member 9 incorporated in the long hole 51 of the holding member 5 holds the retaining member 9. As shown in FIG. 1, the retaining member 9 has a back surface portion 92 that is in contact with the tapered surface 32 of the pusher wheel 3, and has an arcuate surface portion. 10 on the outer peripheral surface 10b side). The wedge-shaped projection 91 is locked to the outer peripheral surface 10 b of the connection pipe 10 inserted into the through hole 21. In the state shown in FIG. 1 before the connection pipe 10 is inserted into the through hole 21, the wedge-shaped projection 91 protrudes from the holding member 5 toward the through hole 21.

  In this example, the connecting pipe 10 is made of austenitic stainless steel (SUS304), but is not particularly limited to austenitic stainless steel (SUS304). The retaining member 9 may be a material harder than the connecting pipe 10. Therefore, in this example, since the connecting pipe 10 is made of austenitic stainless steel (SUS304), the retaining member 9 is made of martensitic stainless steel (SUS420). However, the retaining member 9 may be any material harder than the connecting pipe 10 and is not limited to martensitic stainless steel (SUS420).

  Next, a process of inserting the connecting pipe 10 into the pipe joint 1 having the above configuration will be described.

  First, the connecting pipe 10 is inserted into the through hole 21 (through hole 35) from the pusher wheel 3 side. When the connecting pipe 10 passes through the through hole 21 (through hole 35) in the pusher wheel 3 and passes through the holding member 5, the wedge-shaped projection 91 of the retaining member 9 incorporated in the long hole portion 51 in the holding member 5 is provided. Abut. When the connection tube 10 continues to be inserted even if it comes into contact, the back surface portion 91 of the retaining member 9 moves along the tapered surface 32 of the pusher wheel 3, the inner diameter side of the retaining member 9 expands, and the wedge-shaped projection 91 becomes the connection tube 10. It moves in the insertion direction of the connecting pipe 10 to a position where it is locked to the outer peripheral surface 10b. Along with this movement, the holding member 5 similarly moves in the insertion direction of the connecting pipe 10 while being biased toward the push wheel 3 by the coil spring 8.

  At this time, since the retaining member 9 is urged to the push wheel 3 side together with the holding member 5, when the wedge-shaped projection 91 moves to a position where it is locked to the outer peripheral surface 10 b of the connecting tube 10, the connecting tube 10 pulls the retaining member 9. Even if it is further inserted after passing, the retaining member 9 does not move in the insertion direction of the connecting tube 10, and the retaining member 9 (wedge-like projection 91) slides (slides) on the outer peripheral surface 10 b of the connecting tube 10. At this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5 a of the holding member 5, and the rear portion 94 of the retaining member 9 is on the other end portion 5 b side of the retaining member 5. (See FIG. 6). At this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5 a of the holding member 5, and the rear portion 94 of the retaining member 9 is on the other end portion 5 b side of the retaining member 5. Abut.

  Insertion continues into the through hole 21 of the connecting pipe 10, the end face 10 a of the connecting pipe 10 reaches the support portion 61 of the sleeve 6, and the end face 10 a of the connecting pipe 10 contacts the support portion 61. Since the insertion continues into the through hole 21 of the connection pipe 10 and the movable member 7 is pressed in the insertion direction of the connection pipe 10 by the coil spring 8 (being urged), the connection pipe 10 is inserted by the insertion of the connection pipe 10. The sleeve 6 is in contact with the movable member 7 when the connecting pipe 10 is further inserted after the movable member 7 reaches the end surface 22c. The sleeve 62 moves away from the movable member 7 and moves in the insertion direction of the connecting pipe 10.

  At this time, the seal member 4 is detached from the concave portion 61 a having a substantially arc-shaped cross section formed in the support portion 61 of the sleeve 6, and the end surface 10 a of the connection pipe 10 moves in contact with the support portion 61, so that the seal member 4 is moved. It rides on the sleeve portion 62 of the sleeve 6. Then, the insertion continues into the through hole 21 of the connection pipe 10 and enters the third step portion 24 in a state where the end surface 10 a of the connection pipe 10 is in contact with the support portion 61. When the seal member 4 gets over the sleeve portion 62, the inner diameter of the seal member 4 and the outer peripheral surface 10b of the connection pipe 10 come into contact with each other.

  When the end surface 10 a of the connecting pipe 10 enters the third step portion 24 in a state where the end surface 10 a is in contact with the support portion 61, the support portion 61 has a smaller diameter than the third step portion 24. Enter without touching. However, when the sleeve portion 62 continuous with the support portion 61 enters the third stepped portion 24, the sleeve portion 62 is in contact with the vicinity of the end surface 23a because the diameter of the sleeve portion 62 is increased. In the vicinity of the abutting end surface 23a, an inclined surface 24a is formed from the end surface 23a to the third step portion 24, and since the sleeve portion 62 is provided with a plurality of slits 62a, the sleeve portion 62 is provided on the inclined surface 24a. The sleeve portion 62 whose diameter has been increased is bent in accordance with the diameter of the third step portion 24 when the contact is made.

  Then, the insertion of the connecting pipe 10 into the through hole 21 continues in a state where the sleeve portion 62 is adjusted to the diameter of the third step portion 24. When the movable member 7 reaches the end surface 22c by continuing the insertion into the through hole 21 of the connection pipe 10, the movable member 7 contacts the seal member 4 and the second member 23 and the second member 23 are in contact with the second step portion 23. The seal member 4 is sandwiched between the end surface 23 a of the step portion 23. As a result, the sealing member 4 is pressed by the end surface 23a (the flange wall 23a1 of the sealing groove 12) and the movable member 7 and the pressing by the outer peripheral surface 10b of the connecting pipe 10 and the second step portion 23, as shown in FIG. Deforms as shown in

  By deforming in this way, the seal member 4 is in close contact with the outer peripheral surface 10b of the connection pipe 10, and is also in close contact with the inner peripheral surface (second step portion 23) of the joint body 2 including the flange wall 23a1 of the seal groove 12. To do. As described above, the second step portion 23 sandwiching the seal member 4 and the outer peripheral surface 10b of the connection pipe 10 are sealed along the outer peripheral surface 10b of the connection pipe 10 to which the seal member 4 can move. A groove 12 is formed. Also at this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5a of the holding member 5, and the rear portion 94 of the retaining member 9 is the other end portion 5b of the holding member 5. It is in contact with the side.

  At this time, the movable member 7 is pressed (biased) in the insertion direction of the connecting tube 10 by the compressed coil spring 8 while closing the seal groove 12. Then, as shown in FIG. 6, the end surface 10 a of the connection pipe 10 reaches the end surface 24 b in a state where the end surface 10 a is in contact with the support portion 61. As described above, when the connecting pipe 10 reaches the end surface 24b, the insertion of the connecting pipe 10 is completed. In this state, even if an external force is applied in the direction in which the connection pipe 10 is pulled out, the wedge-shaped protrusion 91 of the retaining member 9 that contacts the tapered surface 32 of the pusher wheel 3 is locked to the outer peripheral surface 10 b of the connection pipe 10. The connecting pipe 10 is not pulled out.

  Next, the pusher wheel 3 is fixed to the joint body 2. In this example, the pusher wheel 3 is pushed into the joint body 2 along the arrow X direction shown in FIG. When the back surface portion 92 of the retaining member 9 that is in contact (contact) with the tapered surface 32 formed on the inner diameter of the pusher wheel 3 is pressed by the pusher wheel 3 (by the inner peripheral surface 3f of the pusher wheel 3), the connecting pipe 10 Move in the radial direction. Therefore, the wedge-shaped protrusion 91 of the retaining member 9 bites into the outer peripheral surface 10 b of the connecting pipe 10 while deforming the connecting pipe 10, and the wedge-shaped protrusion 91 is fixed to the connecting pipe 10. That is, since the tapered surface 32 is formed on the inner diameter side of the pusher wheel 3 so as to increase in diameter toward the joint main body 2 side, the retaining member 9 (of the contact member 9 that is in contact with the pusher wheel 3 when the pusher wheel 3 is pushed (moved)). Since pressure is applied to the back surface portion 92) along the tapered surface 32, it is possible to increase the pressure on the retaining member 9, and the outer peripheral surface 10b of the connecting tube 10 of the retaining member 9 is deformed in the tube radial direction. Can be locked.

  Further, one end 3 d of the pusher wheel 3 comes into contact with one end part 5 a of the holding member 5 due to the pressing by pushing the pusher wheel 3, and the holding member 5 is moved in the arrow X direction. As shown in FIG. 7, the holding member 5 moves to the position of the pusher wheel 5 indicated by the dotted line by applying a pressing force by the movement from the pusher wheel 3 to one end portion 5 a of the holding member 5. That is, the other end 3 e of the holding member 5 is separated from the other end 94 of the retaining member 9, and the retaining member 9 is incorporated in the long hole 51 in the retaining member 5. Part 51 passes.

  Specifically, the gap in the long hole portion 51 moves as the long hole portion 51 passes through the retaining member 9. Therefore, the retaining member 9 is not affected by the movement of the holding member 5, and the position of the retaining member 9 does not change. Then, the other end 5 b side including the ring portion 53 of the holding member 5 presses the coil spring 8 by the movement of the holding member 5. By applying pressure to the side of the coil spring 8 on which the diameter is reduced (small diameter side 8a), pressure is applied to the flat portion 73 of the movable member 7 that is in contact with the side of the coil spring 8 on which the diameter is increased (large diameter side 8b). The movable member 7 moves along the outer peripheral surface 10 b of the connecting pipe 10 in the pushing (moving) direction of the pusher wheel 3.

  By the movement of the movable member 7, pressure is also applied to the seal member 4 that is in contact with the movable member 7, and the seal member 4 moves into the seal groove 12. Further, when the pusher wheel 3 is pushed in the direction of the arrow X shown in FIG. 6, the outer peripheral surface 3 a of the pusher wheel 3 moves along the inner peripheral surface (first step portion 22) of the joint body 2 and is held in the pusher wheel 3. The member 5 also moves in the arrow X direction. Even if the holding member 5 moves in the arrow X direction shown in FIG. 6, the retaining member 9 does not move, and the side surfaces 55 and 55 of the long hole portion 51 pass through the retaining member 9 in the arrow X direction shown in FIG. 7. To go.

  As a result, the rear portion 94 of the retaining member 9 moves away from the other end portion 5b side of the holding member 5 that has been in contact, and between the rear portion 94 of the retaining member 9 and the other end portion 5b of the retaining member 5. A gap S1 is formed. By forming the gap S1, the gap S between the front portion 93 of the retaining member 9 and one end portion 5a of the holding member 5 changes (shrinks) to the gap S2. Therefore, even if the push wheel 3 and the holding member 5 move in the direction of the arrow X shown in FIG. 6, the retaining member 9 in the holding member 5 (in the long hole portion 51) does not move. That is, the retaining member 9 is incorporated in the holding member 5 (in the long hole portion 51), but the retaining member 5 moves relatively independently of the retaining member 9. Therefore, since the force for pushing the pusher wheel 3 is transmitted to the connecting tube 10 in the insertion direction via the retaining member 9, the retaining member 9 is efficiently reduced in diameter in the tube radial direction.

  Then, the movement of the holding member 5 further presses the coil spring 8 on the diameter reducing side (small diameter side 8a), and the plane of the movable member 7 in contact with the coil spring 8 on the diameter expanding side (large diameter side 8b). The portion 73 abuts on the end surface 22 c of the first step portion 22. The flat portion 73 of the movable member 7 contacts the end surface 22c of the first step portion 22, and the coil spring 8 is compressed to the end as shown in FIG. At this time, since the coil spring 8 is compressed to the end, the movable member 7 is restrained in the axial direction by the end face 22 c and the coil spring 8.

  The seal member 4 in contact with the flat surface portion 73 of the movable member 7 is accommodated (moved) in the seal groove 12. Then, the seal member 4 is compressed to the inner peripheral surface (second step portion 23) of the joint body 2 including the flange wall 23a1 of the seal groove 12 and the outer peripheral surface 10b of the connection pipe 10, and the joint body 2 and the connection pipe 10 is connected. That is, the seal member 4 is in close contact with the outer peripheral surface 10 b of the connection pipe 10 and also in close contact with the inner peripheral surface (second step portion 23) of the joint body 2 including the flange wall 23 a 1 of the seal groove 12.

  Further, as shown in FIG. 8, the slide of the pusher wheel 3 (the outer peripheral surface 3 a) into the joint body 2 (the first step portion 22) advances, so that the presser wheel 3 and the joint body 2 are interposed. A certain stop ring 11 moves from the tapered circumferential groove 22a of the joint body 2 to the tapered circumferential groove 22b and enters into the tapered circumferential groove 22b. As a result, the stop ring 11 enters the tapered circumferential groove 22b of the joint body 2 and the circumferential groove 31 of the push ring 3, and the push ring 3 is fixed to the joint body 2, and the connection between the joint body 2 and the connection pipe 10 is achieved. Is also completed. As shown in FIG. 8, a gap S <b> 2 is formed between the front portion 93 of the retaining member 9 and one end portion 5 a of the retaining member 5, and the rear portion 94 of the retaining member 9 and the other of the retaining member 5. A gap S1 is formed between the first end 5b and the second end 5b.

  Next, the leak detection of the pipe joint 1 in which the connection pipe 10 is inserted in this way is performed. In the leak detection, whether or not water (or air) leaks is confirmed by applying pressure to the connecting pipe 10 (through hole 21) with water (or air) as a fluid. Basically, as shown above, if the pusher wheel 3 is fixed to the joint body 2, there is no fluid (water or air) leakage. However, in the piping construction site, there is a possibility that a pipe joint 1 in which the pusher wheel 3 is not fixed to the joint body 2 after the connection pipe 10 is inserted may occur due to the situation at the site (for example, forgetting to push the pusher wheel 3). is there. Therefore, the leak detection of the pipe joint 1 is performed after completion of piping construction. In the following, it will be shown how leakage detection is performed when there is a pipe joint 1 in which the pusher wheel 3 is not fixed to the joint body 2.

  In this example, a test is performed to confirm that water leaks by applying pressure by flowing water to the pipe joint 1 (through hole 21) shown in FIG. By flowing water from the direction of arrow A (or direction of arrow B) to the through hole 21 in the joint body 2, the water also flows to the inner peripheral surface (the third step portion 24 side) in the joint body 2, It flows between the inner peripheral surface (third step portion 24) and the outer peripheral surface 10b of the connecting tube 10, and flows out between the second step portion 23 and the outer peripheral surface 10b of the connecting tube 10 (seal groove 12).

  As water continues to flow to the second step portion 23 side (seal groove 12), pressure continues to be applied from the seal member 4 to the coil spring 8 via the movable member 7, and the seal member 4 is separated from the flange wall 23a1 of the seal groove 12. Then, it moves along the outer peripheral surface 10b of the connecting pipe 10, is pushed out from the seal groove 12, and moves toward the first step portion 22 side. As a result, a gap is formed between the seal groove 12 (in the vicinity of the end surface 22c) and the seal member 4, or the seal surface pressure cannot be ensured, and the water that has flowed into the seal groove 12 flows from the gap to the first stage. It flows out to the part 22. Thus, water leaks when water flows out to the first step portion 22. Thus, when leak detection is performed and the occurrence of leak is confirmed, it is confirmed that the push ring 3 is not fixed to the joint body 2 in the pipe joint 1. In this case, as shown above, the pusher wheel 3 is pushed into the joint body 2 to connect the joint body 2 and the connecting pipe 10 to complete the piping work (see FIG. 8).

(Example 2)
FIG. 9 shows a pipe joint 100 which is Example 2 of the present invention. In Example 2, parts that are substantially the same as the pipe joint 1 shown in Example 1 will be described using the same reference numerals and focusing on the characteristic structure.

  The outer peripheral side of the joint body 2 of the pipe joint 100 shown in FIG. 9 has substantially the same shape as in Example 1, is provided with a stepped portion 2c, an outer peripheral portion 2e, an outer surface portion 2g, and an inclined surface 2d. A taper female screw 2f is formed. A through hole 21 is provided along the longitudinal direction of the joint body 2 from one end 2a to the other end 2b to form a cylindrical shape. In the joint main body 2, a second step 23 having a constant diameter is formed along the longitudinal direction of the joint main body 2 from the end surface 22 c of the first step 22 adjacent to the first step 22. Has been.

  As shown in FIG. 9, the second step portion 23 is smaller in diameter than the first step portion 22 and shorter in length than the first step portion 22. As shown in FIG. 9, the second step portion 23 in the vicinity of the end surface 22 c is provided with an annular groove 23 b having an arcuate cross section that is a recessed portion in a direction along the outer peripheral surface 10 b of the connecting pipe 10 to be inserted. Yes. The circular groove 23b having an arc-shaped cross section is large enough to accommodate the seal member 4 sufficiently. That is, it is formed so that a sufficient space can be secured even when the seal member 4 is inserted. Specifically, the outer diameter of the circular groove 23b having an arc-shaped cross section is formed larger than the outer diameter of the seal member 4, and the arc of the annular groove 23b having an arc-shaped cross section can also include the outer diameter of the seal member 4. It is formed in size. Therefore, when the seal member 4 moves and enters the annular groove 23b having an arcuate section, the outer peripheral surface 4b of the seal member 4 can be held in the annular groove 23b having an arcuate section.

  A third step portion 24 is formed adjacent to the second step portion 23, and a fourth step portion 25 is formed adjacent to the third step portion 24. As described above, the inside of the joint body 2 includes the first step portion 22, the second step portion 23, the third step portion 24, and the fourth step portion from one end 2a to the other end 2b. 25 is formed (along the direction of the through hole 21 (along the outer peripheral surface 10b of the connecting pipe 10 to be inserted)), and each step portion 22, 23 is directed from one end portion 2a to the other end portion 2b. 24 and 25 are reduced in diameter.

  As shown in FIG. 9, the O-ring 4 is incorporated in the second step portion 23 in the joint main body 2 so as to contact the second step portion 23 and the end surface 23a. A sleeve 6 is incorporated adjacent to the O-ring 4, and a movable member 7 is incorporated adjacent to the sleeve 6. As shown in FIG. 9, the movable member 7 is a ring-shaped member, and includes an edge portion 7a and a ring portion 7b. The outer peripheral surface 71 of the edge portion 7a of the movable member 7 is incorporated along the first step portion 22, and the ring portion 7b extends along the direction of the through hole 21. Next, a coil spring 8, which is an elastic member 8, is incorporated in the first step portion 22 adjacent to the movable member 7. The stop ring 11 is incorporated in the tapered circumferential groove 22a of the first step portion 22, and a part of the stop ring 11 protrudes from the tapered circumferential groove 22a.

  Next, a push ring 3, which is a cylindrical member similar to Example 1, is incorporated into the joint body 2 from one end 2 a of the joint body 2. As in Example 1, a part of the stop ring 11 protruding from the tapered circumferential groove 22 a in the joint body 2 enters the circumferential groove 31 of the push ring 3. Further, as in Example 1, the holding member 5 similar to that in Example 1 is incorporated in the pusher wheel 3, and the retaining member 9 similar to that in Example 1 is incorporated in the long hole portion 51 in the holding member 5, A wedge-shaped protrusion 91 of the retaining member 9 protrudes toward the through hole 21 (the wedge-shaped protrusion 91 protrudes from the inner peripheral surface of the holding member 5).

  Next, the process of inserting the connecting pipe 10 into the pipe joint 100 having the above configuration will be described with reference to FIG.

  The insertion of the connecting pipe 10 into the pipe joint 100 is basically the same as in Example 1. When the connecting pipe 10 is inserted into the through hole 21 of the pipe joint 100 and the holding member 5 passes, the connecting pipe 10 contacts the wedge-shaped protrusion 91 of the retaining member 9 incorporated in the long hole portion 51 in the holding member 5. Touch. When the connection tube 10 continues to be inserted even after the contact, the back surface portion 91 of the retaining member 9 moves along the tapered surface 32 of the pusher wheel 3, the inner diameter side of the retaining member 9 expands, and the wedge-shaped projection 91 becomes the connection tube 10. It moves in the insertion direction of the connecting pipe 10 to a position where it is locked to the outer peripheral surface 10b. Along with this movement, the holding member 5 similarly moves in the insertion direction of the connecting pipe 10 while being biased toward the push wheel 3 by the coil spring 8.

  At this time, since the retaining member 9 is urged to the push wheel 3 side together with the holding member 5, when the wedge-shaped protrusion 91 moves to a position where it is locked to the outer peripheral surface 10 b of the connecting tube 10, the connecting tube 10 is further inserted. In addition, the retaining member 9 does not move in the insertion direction of the connecting tube 10, and the retaining member 9 (wedge-like projection 91) slides (slides) on the outer peripheral surface 10 b of the connecting tube 10. At this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5 a of the holding member 5, and the rear portion 94 of the retaining member 9 is on the other end portion 5 b side of the retaining member 5. (See FIG. 10).

  And by the insertion of the connecting pipe 10, the press by the coil spring 8 is added to the movable member 7 (edge part 7a), and the movable member 7 (ring part 7b) moves to the 2nd step part 23 side. When the edge portion 7 a of the movable member 7 reaches the end surface 22 c of the first step portion 22, the seal member 4 is interposed between the ring portion 7 b and the end surface 23 a of the second step portion 23 in the second step portion 23. The ring portion 7 b of the movable member 7 comes into contact with the seal member 4 by being sandwiched. As a result, the seal member 4 is pressed by the outer peripheral surface 10b of the connecting pipe 10 and the second step portion 23 and by the end surface 23a (the flange wall 23a1 of the seal groove 12) and the ring portion 7b of the movable member 7. As shown in FIG.

  By deforming in this way, the seal member 4 is in close contact with the outer peripheral surface 10 b of the connection pipe 10 and also in close contact with the joint body 2. As described above, the second step portion 23 sandwiching the seal member 4 and the outer peripheral surface 10b of the connection pipe 10 are sealed along the outer peripheral surface 10b of the connection pipe 10 to which the seal member 4 can move. A groove 12 is formed. Also at this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5a of the holding member 5, and the rear portion 94 of the retaining member 9 is the other end portion 5b of the holding member 5. The state of being in contact with the side is maintained.

  On the other hand, the connecting tube 10 passes through the spring 8, moves toward the end surface 22 c of the first step portion 22, passes through the movable member 7, and the end surface 10 a of the connecting tube 10 comes into contact with the support portion 61 of the sleeve 6. . Then, as shown in FIG. 10, the insertion continues into the through hole 21 of the connection tube 10 in a state of being in contact with the support portion 61 of the sleeve 6, and the end surface of the connection tube 10 is in contact with the support portion 61 of the sleeve 6. When 10a reaches the end face 24b of the joint body 2, the insertion of the connecting pipe 10 is completed. As in Example 1, even if an external force is applied in the direction in which the connection tube 10 is pulled out in this state, the connection tube 10 is not pulled out by the wedge-shaped protrusion 91 of the retaining member 9.

  Next, as in Example 1, the pusher wheel 3 is pushed into the joint body 2 along the arrow X direction shown in FIG. By pressing (moving) the pusher wheel 3, radial pressing (pressing of the inner peripheral surface 3 f of the pusher wheel 3) is applied to the back surface portion 92 of the retaining member 9 that is in contact (contact) with the tapered surface 32 of the pusher wheel 3. Then, the wedge-shaped protrusion 91 of the retaining member 9 is locked to the outer peripheral surface 10b of the connection tube 10 and fixed to the connection tube 10. Further, when the pusher wheel 3 is pushed (moved), the pusher wheel 3 comes into contact with the holding member 5 and moves the holding member 5 in the arrow X direction. Similarly to Example 1, the other end portion 5b of the holding member 5 is separated from the rear portion 94 of the retaining member 9, and the long hole portion 51 incorporating the retaining member 9 passes through the retaining member 9 (see FIG. 7). The retaining member 9 does not move. That is, the gap in the long hole portion 51 moves.

  And by the movement of the holding member 5, pressure is applied to the diameter-reducing side (small-diameter side 8 a) of the coil spring 8, so that the movable member 7 that is in contact with the diameter-expanding side (large-diameter side 8 b) of the coil spring 8. Pressing is applied to the edge 7a, and the movable member 7 moves in the pushing (moving) direction of the pusher wheel 3. By the movement of the movable member 7, pressure is also applied to the seal member 4 that is in contact with the ring portion 7 b of the movable member 7.

  Further, when the pusher wheel 3 is pushed in the arrow X direction shown in FIG. 10, the holding member 5 in the pusher wheel 3 also moves in the arrow X direction. At this time, the wedge-shaped projection 91 of the retaining member 9 in the long hole portion 51 of the holding member 5 is locked to the outer peripheral surface 10b of the connecting pipe 10, and the holding member 5 moves in the direction of the arrow X shown in FIG. However, the retaining member 9 does not move. As a result, at the rear portion 94 of the retaining member 9, the other end portion 5 b side of the holding member 5 that has been in contact with the separation member 9 moves away, and between the rear portion 94 of the retaining member 9 and the other end portion 5 b of the retaining member 5. A gap S1 is formed in the gap. By forming the gap S1, the gap S between the front portion 93 of the retaining member 9 and one end portion 5a of the holding member 5 changes (shrinks) to the gap S2.

  As described above, the retaining member 9 is incorporated in the holding member 5 (in the long hole portion 51), but the retaining member 5 moves independently of the retaining member 9. Due to the movement of the holding member 5, pressure is further applied to the side of the coil spring 8 on which the diameter is reduced (small diameter side 8 a), and the edge 7 a of the movable member 7 that is in contact with the side of the coil spring 8 on which the diameter is enlarged (large diameter side 8 b). Approaches the end face 22c of the first step portion 22.

  Then, as shown in FIG. 11, the coil spring 8 is compressed, and the ring portion 7 b of the movable member 7 urged toward the joint body 2 by the coil spring 8 abuts against the seal member 4 and applies pressure. Therefore, the seal member 4 is compressed by the inner peripheral surface (second step portion 23) of the joint main body 2 including the flange wall 23a1 of the seal groove 12, the outer peripheral surface 10b of the connecting pipe 10, and the ring portion 7b. 2 and the connecting pipe 10 are connected.

  Further, as shown in FIGS. 10 and 11, as the slide of the pusher wheel 3 (the outer peripheral surface 3a thereof) into the joint body 2 (the first step portion 22 thereof) proceeds, the pusher wheel 3 and the joint body 2 The stop ring 11 between them moves from the tapered circumferential groove 22a of the joint body 2 to the tapered circumferential groove 22b and enters into the tapered circumferential groove 22b. As a result, the stop ring 11 enters the tapered circumferential groove 22b of the joint body 2 and the circumferential groove 31 of the push ring 3, and the push ring 3 is fixed to the joint body 2, and the connection between the joint body 2 and the connection pipe 10 is achieved. Is completed. Then, as shown in FIG. 11, the front portion 93 of the retaining member 9 abuts on the one end portion 5 a side of the holding member 5, and the rear portion 94 of the retaining member 9 and the other end portion 5 b of the retaining member 5 A gap S1 is formed between them.

  Next, a leak test is performed on the pipe joint 100 into which the connection pipe 10 has been inserted. Basically, as shown above, if the pusher wheel 3 is fixed to the joint body 2, there is no leakage of water (or air) which is a fluid. In the following, as in Example 1, how the leak detection is performed when the pusher wheel 3 is not fixed to the joint body 3 will be described.

  In the leak detection, water (or air) is reliably supplied by applying a pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. 10 (or from the direction of arrow B in FIG. 10). It will be confirmed to leak. In Example 2, a test for confirming that water leaks by applying pressure (water pressure) by flowing water to the pipe joint 100 (through hole 21) from the direction of arrow A in FIG. Do. When water flows from the direction of arrow A (or direction of arrow B) into the through hole 21 in the joint body 2, the water also flows into the inner peripheral surface (the third step portion 24 side) in the joint body 2. It flows between the peripheral surface (third step portion 24) and the outer peripheral surface 10b of the connecting pipe 10, and flows out between the second step portion 23 and the outer peripheral surface 10b of the connecting tube 10 (seal groove 12).

  By continuing the flow of water to the second step portion 23 side (seal groove 12), the pressure (water pressure) continues to be applied from the seal member 4 to the coil spring 8 via the movable member 7, and the seal member 4 is in contact with the seal groove 12. It moves away from the wall 23a1 and enters an annular groove 23b having a circular arc cross section that can hold the outer peripheral surface 4b of the seal member 4. A gap is formed between the annular groove 23b having an arcuate cross section and the seal member 4 in the annular groove 23b having an arcuate cross section, or the seal surface pressure cannot be secured and flows out to the second step portion 23. The water that has entered the gap flows out to the first step portion 22. Thus, water leaks when water flows out to the first step portion 22. Thus, when leak detection is performed and the occurrence of leak is confirmed, it is confirmed that the push ring 3 is not fixed to the joint body 2 in the pipe joint 100. In this case, as shown above, the pusher wheel 3 is pushed into the joint body 2 to connect the joint body 2 and the connecting pipe 10 to complete the piping work (see FIG. 11).

  In the pipe joint 100 used in this example, the second step portion 23 is provided with the annular groove 23b having a circular arc cross section. Therefore, when the connection pipe 10 is inserted, some inconvenience occurs and the connection pipe 10 is pulled out. Even if so-called re-construction is performed in which the connection pipe 10 is to be inserted again, the sealing member 4 does not prevent the connection pipe 10 from being inserted. That is, when the seal member 4 enters the circular groove 23b having an arc-shaped cross section, the inner diameter side 4a of the seal member 4 is formed in the second step portion 23 so deep as not to prevent insertion of the connecting pipe 10 to be inserted. This is because when the sealing member 4 moved together with the connecting pipe 10 when pulling out the connecting pipe 10 moves to the annular groove 23b, it remains in the annular groove 23b having an arcuate cross section and does not move any further. Therefore, it is one of the pipe joints that are easy to construct in the case of performing re-construction in which the connection pipe 10 is pulled out and inserted again due to various circumstances after the connection pipe 10 is inserted.

(Example 3)
FIG. 12 shows a pipe joint 200 that is Example 3 of the present invention. In Example 3, parts that are substantially the same as the pipe joints 1 and 100 shown in Examples 1 and 2 will be described using the same reference numerals and focusing on characteristic parts.

  The outer peripheral side of the joint main body 2 of the pipe joint 200 shown in FIG. 12 has substantially the same shape as the first and second examples. In the joint body 2, a plurality of step portions 22, 23, 24, and 25 that are substantially the same as those in Examples 1 and 2 are formed along the longitudinal direction of the joint body 2. In this example, an inclined surface 22 d that is a contact surface 22 d is formed adjacent to the first step portion 22 from the end surface 22 c of the first step portion 22 to the second step portion 23. As shown in FIG. 12, the inclined surface 22 d faces the outer peripheral surface 10 b of the connection pipe 10 inserted into the through hole 21 of the pipe joint 200 and extends from the second step portion 23 toward the first step portion 22. The diameter is increased (expanded in the direction of the push wheel 3). The inclined surface 22d serves as a guide when the seal member 4 enters the second step portion.

  As shown in FIG. 12, the sleeve 6 is incorporated in the joint body 2 from the first step portion 22 to the second step portion 23 on the first step portion 22 side. The O-ring 4 is incorporated in an unconstrained state along the direction of the through hole 21 so that the inner diameter side 4a abuts on the sleeve 6. Further, a coil spring 8 is incorporated so as to cover the O-ring 4. The coil spring 8 has a substantially truncated cone shape, and the large-diameter side 8 b of the coil spring 8 is incorporated in contact with the end surface 22 c of the first step portion 22.

  A holding member 17 is incorporated adjacent to the small diameter side 8 a of the coil spring 8. As shown in FIG. 12, the holding member 17 is a ring-shaped member, and includes an edge portion 17a and a ring portion 17b. The ring portion 17b is provided with a long hole portion 17b1 which is a hole portion, and the retaining member 9 is incorporated in the long hole portion 17b1. Similarly to Example 1, the long hole portion 17b1 is longer than the retaining member 9 (longitudinal direction thereof), and extends along the moving direction of the holding member 17 when the retaining member 9 is incorporated into the long hole portion 17b1. A gap is formed in the long hole portion 17b1. Also, as shown in FIG. 12, the edge portion 17a is movable along the first step portion 22, and the ring portion 17b enters the small diameter side 8a of the coil spring 8, along the through hole 21, The seal member 4 extends in the direction.

  Further, the holding member 17 in the present example is formed with a flat portion 17e having no stepped portion, like the holding member 5 in the first and second examples. Also, the holding member 17 in this example is provided with a long hole portion 17b1 similarly to the holding member 5 in Example 1 and Example 2, and the configuration of the long hole portion 17b1 is the long hole of Example 1 and Example 2. This is the same as the unit 51. Then, the retaining member 9 similar to that in Example 1 and Example 2 is incorporated in the holding member 17, and as shown in FIG. 12, the wedge-shaped projection 91 of the retaining member 9 protrudes toward the through hole 21 (the wedge-shaped projection 91. Is protruding from the flat surface portion 17e of the holding member 17).

  The push ring 3 is incorporated in the joint body 2 so as to cover the ring portion 17b in which the retaining member 9 is incorporated. As shown in FIG. 12, a circumferential groove 33 is formed in addition to the circumferential groove 31 on the outer circumferential surface 3 a of the push ring 3 in this example, and a ring-shaped indicator 34 is provided in the circumferential groove 33. It is incorporated, and it is possible to confirm whether or not the connection pipe 10 and the joint body 2 are connected in a completely sealed state. In this example, the ring-shaped indicator 34 is a ring-shaped molded body made of polyolefin such as PE or PP. However, it is not limited to such a ring-shaped molded body, and a film-like tape having excellent weather resistance can also be used. Furthermore, the present invention is not limited thereto, and the indicator 34 can be obtained by applying an oil-based paint to the outer peripheral surface 3a of the pusher wheel 3.

  Next, a process of inserting the connection pipe 10 into the pipe joint 200 having the above configuration will be described with reference to FIG.

  Insertion of the connecting pipe 10 into the pipe joint 200 is basically the same as in the first and second examples. When the connecting pipe 10 is inserted into the through hole 21 of the pipe joint 200 and the holding member 17 passes, the connecting pipe 10 contacts the wedge-shaped protrusion 91 of the retaining member 9 incorporated in the long hole portion 17b1 in the holding member 17. Touch. When the connection tube 10 continues to be inserted even if it comes into contact, the back surface portion 91 of the retaining member 9 moves along the tapered surface 32 of the pusher wheel 3, the inner diameter side of the retaining member 9 expands, and the wedge-shaped projection 91 becomes the connection tube 10. It moves in the insertion direction of the connecting pipe 10 to a position where it is locked to the outer peripheral surface 10b. Along with this movement, the holding member 17 similarly moves in the insertion direction of the connecting pipe 10 while being biased toward the push wheel 3 by the coil spring 8.

  At this time, since the retaining member 9 is urged to the push wheel 3 side together with the holding member 17, when the wedge-shaped projection 91 moves to the position where the outer peripheral surface 10 b of the connecting tube 10 is locked in the holding member 17, the connecting tube Even if 10 is further inserted, the retaining member 9 does not move in the insertion direction of the connecting tube 10, and the retaining member 9 (the wedge-shaped protrusion 91) slides (slides) on the outer peripheral surface 10 b of the connecting tube 10. At this time, a gap S is formed between the front portion 93 of the retaining member 9 and the one end portion 17 c side of the holding member 17, and the rear portion 94 of the retaining member 9 is the other end portion 17 d of the retaining member 17. It will be in the state contact | abutted to the side (refer FIG. 13).

  When the connecting pipe 10 passes through the coil spring 8, the connecting pipe 10 continues to be inserted while being in contact with the sleeve 6 formed integrally with or separately from the holding member 17 and separable from the holding member 17. By inserting the connecting pipe 10, the holding member 17 and the sleeve 6 are separated, and the inner diameter side 4 a of the seal member 4 is also in contact with the outer peripheral surface 10 b of the connecting pipe 10. At this time, since the holding member 17 is urged in the direction of the push wheel 3 by the coil spring 8, it does not move in the insertion direction of the connecting pipe 10. Further, the insertion of the connecting pipe 10 is completed by continuing the insertion of the connecting pipe 10 and reaching the end face 24b of the joint body 2 with the end face 10a of the connecting pipe 10 in contact with the sleeve 6. By inserting the connection pipe 10 as described above, the end surface 23a of the second step portion 23, the inner peripheral surface (second step portion 23) of the joint body 2, and the outer peripheral surface 10b of the connection tube 10 are obtained. Thus, the seal groove 12 is formed along the outer peripheral surface 10 b of the connection pipe 10.

  Next, as in Example 1 and Example 2, the pusher wheel 3 is pushed into the joint body 2 along the arrow X direction shown in FIG. By pressing (moving) the pusher wheel 3, radial pressing (pressing of the inner peripheral surface 3 f of the pusher wheel 3) is applied to the back surface portion 92 of the retaining member 9 that is in contact (contact) with the tapered surface 32 of the pusher wheel 3. Then, the wedge-shaped protrusion 91 of the retaining member 9 is locked to the outer peripheral surface 10b of the connection tube 10 and fixed to the connection tube 10. Further, when the pusher wheel 3 is pushed (moved), the pusher wheel 3 comes into contact with the holding member 17 and moves the holding member 17 in the arrow X direction. As in Example 1, as shown in FIG. 14, the other end 17 d of the holding member 17 is separated from the rear part 94 of the retaining member 9, and the long hole portion 17 b 1 incorporating the retaining member 9 passes through the retaining member 9. However, the retaining member 9 does not move. That is, the gap in the long hole portion 17b1 moves.

  As the holding member 17 moves, a pressure is applied to the side of the coil spring 8 on which the diameter is reduced (small diameter side 8a), and the coil spring 8 is compressed to the end surface 22c of the first step portion 22 with which the large diameter side 8b abuts. The ring portion 17b of the holding member 17 moves in the pushing (moving) direction of the pusher wheel 3. Due to the movement of the holding member 17, the ring portion 17 b of the holding member 17 moves along the outer peripheral surface 10 b of the connection pipe 10 and comes into contact with the seal member 4.

  The seal member 4 is moved between the inner peripheral surface (second step portion 23) of the joint body 2 and the outer peripheral surface 10b of the connecting pipe 10 (seal groove 12) by the movement (pressing) of the ring portion 17b of the holding member 17. Inside). The seal member 4 reaches the flange wall 23a1 of the seal groove 12 by the movement of the ring portion 17b. At that position, the seal member 4 is compressed by the inner peripheral surface (second step portion 23) of the joint body 2 including the flange wall 23a1 of the seal groove 12, the outer peripheral surface 10b of the connecting pipe 10, and the ring portion 17b. The joint body 2 and the connecting pipe 10 are connected. That is, by deforming the seal member 4 as shown in FIG. 14, the seal member 4 comes into close contact with the outer peripheral surface 10 b of the connection pipe 10, and the inner peripheral surface of the joint body 2 including the flange wall 23 a 1 of the seal groove 12. It is also in close contact with (second step portion 23).

  Further, as shown in FIGS. 13 and 14, the indicator 34 is inserted into the circumferential groove 33 of the pusher wheel 3 by the sliding of the pusher wheel 3 with respect to the joint body 2, and the pusher wheel is inserted into the joint body 2. By pushing 3, the indicator 34 of the pusher wheel 3 approaches one end 2 a of the joint body 2. When the stop ring 11 between the pusher wheel 3 and the joint body 2 enters the tapered circumferential groove 22b of the joint body 2 and the circumferential groove 31 of the pusher wheel 3, one end 2a of the joint body 2 is obtained. The side covers the indicator 34 in the circumferential groove 33 of the pusher wheel 3. Thus, it can be confirmed that the pusher wheel 3 is fixed to the joint body 2 and the connection between the joint body 2 and the connecting pipe 10 is also completed.

  As shown in FIG. 14, a gap S <b> 2 is formed between the front portion 93 of the retaining member 9 and one end portion 17 c of the retaining member 17, and the rear portion 94 of the retaining member 9 and the other end of the retaining member 17. A gap S1 is formed between the end 17d.

  Next, as in Example 1 and Example 2, a leak test is performed on the pipe joint 200 into which the connection pipe 10 has been inserted. Basically, as shown above, if the pusher wheel 3 is fixed to the joint body 2, there is no fluid (water or air) leakage. In the following, as in Example 1 and Example 2, how the leak detection is performed when the pusher wheel 3 is not fixed to the joint body 2 will be described.

  In the leak detection, water or air leaks by applying pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. 13 (or from the direction of arrow B in FIG. 13). Will be confirmed. In Example 3, it is confirmed that water leaks by applying pressure (water pressure) by flowing water to the pipe joint 200 (through hole 21) from the direction of arrow A in FIG. Perform a test. When water flows into the through hole 21 in the joint body 2, the water flows to the inner peripheral surface (third step portion 24) in the joint main body 2, and the inner peripheral surface (third step portion 24) and the connection pipe 10 and flows between the second step portion 23 and the outer peripheral surface 10b of the connecting pipe 10.

  As water continues to flow to the second step portion 23 side, pressure (water pressure) is applied to the seal member 4 in contact with the inclined surface 22d. Then, the seal member 4 is separated from the inclined surface 22d of the seal groove 12, and the seal member 4 is moved along the outer peripheral surface 10b of the connecting pipe 10, so that a gap is formed between the inclined surface 22d and the seal member 4. The seal surface pressure cannot be ensured, and the water flowing between the second step portion 23 and the outer peripheral surface 10 b of the connecting pipe 10 flows out to the first step portion 22. Thus, water leaks when water flows out to the first step portion 22. Thus, when leak detection is performed and the occurrence of leak is confirmed, it is confirmed that the push ring 3 is not fixed to the joint body 2 in the pipe joint 200. In this case, as shown above, the pusher wheel 3 is pushed into and fixed to the joint body 2, the connection between the joint body 2 and the connecting pipe 10 is completed, and piping construction is completed (see FIG. 14).

(Example 4)
FIG. 15 shows a pipe joint 300 which is Example 4 of the present invention. Example 4 is basically the same as the structure of Example 1, and components that are substantially the same as the pipe joint 1 shown in Example 1 will be described using the same reference numerals. The difference between Example 4 and Example 1 is that when the push ring 3 is pushed into the joint body 2, the stop ring 11 is used between the push ring 3 and the joint body 2 in Example 1, whereas in Example 4, That is, the presser wheel 3 and the joint body 2 are screwed together.

  The joint body 2 of the pipe joint 300 shown in FIG. 15 has the same shape as that of Example 1, and has a cylindrical shape with a through hole 21 penetrating from one end 2a to the other end 2b. The outer peripheral side and inner peripheral side of the joint body 2 have the same shape as in Example 1. However, as shown in FIG. 15, a thread groove 22 e is formed in the first step portion 22 in the joint body 2 along the longitudinal direction of the joint body 2. Then, as shown in FIG. 15, the O-ring 4 is incorporated in the second step portion 23 in the joint body 2, and the sleeve 6 is incorporated adjacent to the O-ring 4. A movable member 7 is incorporated adjacent to 6.

  Further, a coil spring 8, which is an elastic member 8, is incorporated in the first step portion 22 adjacent to the movable member 7. A push ring 3 that is a cylindrical member is incorporated into the joint body 2 from one end 2 a of the joint body 2. A thread groove 3a1 that is screwed with the thread groove 22e of the joint body 2 is formed on the outer peripheral surface 3a of the press ring 3, and the thread groove 22e of the joint body 2 is threaded. As in Example 1, the holding member 5 similar to Example 1 is incorporated in the pusher wheel 3, the retaining member 9 similar to Example 1 is incorporated in the retaining member 5, and the wedge-shaped projection 91 of the retaining member 9 is formed. It protrudes to the through hole 21 side.

  Next, a process of inserting the connection pipe 10 into the pipe joint 300 having the above configuration will be described with reference to FIG.

  The insertion of the connecting pipe 10 into the pipe joint 300 is basically the same as in Example 1. When the connecting pipe 10 is inserted into the through hole 21 of the pipe joint 300, it comes into contact with the wedge-shaped protrusion 91 of the retaining member 9 incorporated in the long hole portion 51 in the holding member 5. If the connection tube 10 continues to be inserted even if it abuts, the retaining member 9 expands on the inner diameter side along the tapered surface 32 of the pusher wheel 3 and reaches the position where the wedge-shaped projection 91 is locked to the outer peripheral surface 10 b of the connection tube 10. Move in the 10 insertion direction. At this time, since the holding member 5 is pressed (biased) by the coil spring 8, it does not move in the moving direction of the connecting pipe 10.

  Therefore, when the wedge-shaped protrusion 91 moves to a position where the wedge-shaped projection 91 is locked to the outer peripheral surface 10b of the connecting pipe 10, even if the connecting pipe 10 is inserted, the retaining member 9 does not move in the insertion direction of the connecting pipe 10, and the retaining member 9 The wedge-shaped projection 91 slides (slides) on the outer peripheral surface 10 b of the connecting pipe 10. At this time, a gap S is formed between the front portion 93 of the retaining member 9 and one end portion 5 a of the holding member 5, and the rear portion 94 of the retaining member 9 is on the other end portion 5 b side of the retaining member 5. (See FIG. 16).

  Then, the insertion of the connecting pipe 10 continues, the end face 10a of the connecting pipe 10 abuts on the sleeve 6, enters the third stepped portion 24, and is pressed by the coil spring 8 (by biasing), so that the movable member 7 is moved to the first position. The movable member 7 comes into contact with the seal member 4 toward the end surface 22 c of the one step portion 22. As a result, the sealing member 4 is shown in FIG. 16 by the pressing by the outer peripheral surface 10b of the connecting pipe 10 and the second step portion 23 and the pressing by the end surface 23a (the flange wall 23a1 of the sealing groove 12) and the movable member 7. It deforms as follows.

  By deforming in this way, the seal member 4 is in close contact with the outer peripheral surface 10 b of the connection pipe 10 and also in close contact with the joint body 2. As described above, the second step portion 23 sandwiching the seal member 4 and the outer peripheral surface 10b of the connection pipe 10 are along the outer peripheral surface 10b of the connection pipe 10 to which the seal member 4 can move. A seal groove 12 is formed. On the other hand, as shown in FIG. 16, the connecting tube 10 passes through the spring 8 and the movable member 7, and the end surface 10 a of the connecting tube 10 contacts the support portion 61 of the sleeve 6 and contacts the support portion 61 of the sleeve 6. In this state, when the end surface 10a of the connection pipe 10 reaches the end surface 24b of the joint body 2, the insertion of the connection pipe 10 is completed.

  After the insertion of the connecting pipe 10 is completed, the pusher wheel 3 screwed into the joint body 2 is screwed in the direction of the arrow X shown in FIG. Due to this screwing, radial pressure is applied to the back surface portion 92 of the retaining member 9 that is in contact (contact) with the tapered surface 32 of the pusher wheel 3, and the wedge-shaped protrusion 91 of the retaining member 9 becomes the outer peripheral surface 10 b of the connecting tube 10. And is fixed to the connecting pipe 10. Further, by this screwing, the pusher wheel 3 comes into contact with the holding member 5 and the holding member 5 also moves. At that time, the long hole portion 51 of the holding member 5 incorporating the retaining member 9 passes through the retaining member 9 (see FIG. 7), and the retaining member 9 does not move. That is, the gap in the long hole portion 51 moves.

  That is, the holding member 5 moves independently of the retaining member 9. Then, the rear portion 94 of the retaining member 9 is separated from the other end portion 5b side of the holding member 5, and a gap S1 is formed between the rear portion 94 of the retaining member 9 and the other end portion 5b of the retaining member 5. By forming the gap S1, the gap S between the front portion 93 of the retaining member 9 and one end portion 5a of the holding member 5 changes (shrinks) to the gap S2.

  Accordingly, the coil spring 8 and the movable member 7 move, the movable member 7 contacts the seal member 4, and the seal member 4 moves into the seal groove 12. The seal member 4 is compressed by the inner peripheral surface (second step portion 23) of the joint body 2 including the flange wall 23a1 of the seal groove 12 and the outer peripheral surface 10b of the connection pipe 10, and the joint body 2 and the connection pipe 10 is connected. Then, as the screw advances, the pusher wheel 3 is fixed to the joint body 2, and the connection between the joint body 2 and the connecting pipe 10 is completed. As shown in FIG. 17, the front portion 93 of the retaining member 9 and the holding member A gap S <b> 2 is formed between the first end portion 5 a and the rear end portion 94 of the retaining member 9 and the other end portion 5 b of the holding member 5.

  Next, as in Example 1, Example 2 and Example 3, leakage detection is performed on the pipe joint 300 into which the connection pipe 10 has been inserted in this way. Basically, as shown above, if the pusher wheel 3 is fixed to the joint body 2, there is no fluid (water or air) leakage. Hereinafter, as in Example 1, Example 2, and Example 3, it will be shown how leakage detection is performed when the pusher wheel 3 is not fixed to the joint body 2.

  In Example 4, as in Examples 1 to 3, a test is performed to confirm that water leaks by applying pressure (water pressure) by flowing water through the pipe joint 300 (through hole 21). From the direction of the arrow A shown in FIG. 16 (or from the direction of the arrow B shown in FIG. 16), water flows into the through hole 21 in the joint body 2 so that water flows to the inner peripheral surface in the joint body 2. It flows between the peripheral surface (third step portion 24) and the outer peripheral surface 10b of the connecting pipe 10 (seal groove 12), and between the second step portion 23 and the outer peripheral surface 10b of the connecting tube 10 (seal groove 12). ).

  As water continues to flow into the seal groove 12, pressure (water pressure) continues to be applied from the seal member 4 to the coil spring 8 via the movable member 7, and the seal member 4 is pushed out of the seal groove 12 to the first step portion 22. Moving. As a result, a gap is formed between the seal groove 12 (in the vicinity of the end surface 22c) and the seal member 4, or the seal surface pressure cannot be ensured, and the water that has flowed into the seal groove 12 is discharged from the gap to the first. It flows out to the step 22. In this way, water leaks when the water flows out to the first step portion 22. Thus, when leak detection is performed and the occurrence of leak is confirmed, it is confirmed that the pusher wheel 3 is not fixed to the joint body 2 in the pipe joint 300. In this case, as shown above, the pusher wheel 3 is pushed into the joint body 2 to connect the joint body 2 and the connection pipe 10 to complete the piping work (see FIG. 17).

  In Examples 1 to 4, a gap S2 is formed between the front portion 93 of the retaining member 9 and the one end portions 5a and 17c of the retaining members 5 and 17, and the rear portion 94 and the retaining member 9 are retained. Although the case where the gap S1 is formed between the other end portions 5b and 17d of the members 5 and 17 has been shown, in this way, both the front direction and the rear direction of the retaining member 9 in the holding members 5 and 17 are shown. It is not necessary to form the gaps S1 and S2. In particular, depending on the diameter of the connecting pipe 10 to be inserted, the formation of the gaps S1 and S2 is different, and the gap S1 is formed, but the gap S2 may not be formed. Conversely, the gap S1 is formed. In some cases, the gap S2 is formed.

  In the present invention, the method of fixing the pusher wheel 3 and the joint body 2 is not limited to the forms shown in Examples 1 to 4, and other fixing methods can be selected. For example, the joint body 2 has at least two annular protrusions provided on the outer diameter side thereof, and the pusher wheel 3 has a locking portion formed so that the end of the joint body 2 side can be elastically expanded in diameter. Then, the engaging part is engaged with the annular projection provided on the end side of the joint body 2, the push ring 3 is attached to the joint body 2, and when the push ring 3 is pushed in, the engaging part becomes the back side of the joint body 2. It can be set as the structure which moves and latches it until it gets over the annular protrusion formed in this.

It is explanatory drawing which shows the structure before incorporating the connection pipe in Example 1 of the pipe joint which is this invention from a cross section. It is a perspective view of the holding member integrated in the pipe joint which is this invention. It is a side view of the holding member shown in FIG. It is sectional drawing which follows the CC line of FIG. It is a rear view of the holding member integrated in the pipe joint which is this invention. It is explanatory drawing which shows the structure after incorporating the connection pipe in Example 1 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the relationship between the holding member and the securing member incorporated in the pipe joint which is this invention. It is explanatory drawing which shows the state which pushed in the press ring in Example 1 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure before incorporating the connection pipe in Example 2 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure after incorporating the connection pipe in Example 2 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the state which pushed the press ring in Example 2 of the pipe joint which is this invention from the cross section including the relationship of a securing member. It is explanatory drawing which shows the structure before incorporating the connection pipe in Example 3 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure after incorporating the connection pipe in Example 3 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the state which pushed in the press ring in Example 3 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure before incorporating the connection pipe in Example 4 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure after incorporating the connection pipe in Example 4 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the state which pushed in the press ring in Example 3 of the pipe joint which is this invention from a cross section. It is sectional drawing which was notched partially showing the press-type pipe joint in the point of use. It is principal part sectional drawing of the state before the connection of the conventional pipe joint. It is principal part sectional drawing of the state before the connection of the conventional pipe joint. It is principal part sectional drawing which shows the conventional pipe joint. It is a half sectional view of the conventional pipe joint. It is explanatory drawing which shows the difference of the inter-surface dimension (Lp1) in the temporary assembly state of the connection pipe to a pipe joint, and the inter-surface dimension (Lp2) after the construction which pushed the press ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100,200,300 ... Pipe joint 11 ... Stop ring (stopper), 12 ... Seal groove 2 ... Joint main body, 2a ... One end part of a joint main body, 2b ... The other end part of a joint main body, 2c ... Step, 2d ... inclined surface, 2e ...
Peripheral surface, 2f ... tapered male screw, 2g ... outer peripheral surface, 22 ... first step, 22a ... circular groove with taper, 22a1 ... tapered surface, 22b ... circumferential groove with taper, 22b1 ... tapered surface, 22c ... end surface , 22d ... inclined surface (contact surface), 22e ... thread groove, 23 ... second step portion, 23a ... end face, 23a1 ... collar wall of seal groove, 23b ... annular groove, 24 ... third step portion, 24a ... Inclined surface, 25 ... Fourth step portion 21 ... Through hole 3 ... Pressing wheel, 3a ... Outer peripheral surface, 3a1 ... Screw groove, 3b ... Outer peripheral surface, 3c ... Outer peripheral surface, 3d ... One end of press wheel, 3e ... The other end of the press ring, 3f ... inner peripheral surface, 31 ... circumferential groove, 32 ... tapered surface, 33 ... circular groove, 34 ... indicator, 35 ... through hole 4 ... seal member, 4a ... inner diameter side, 4b ... Outer peripheral surface 5 ... holding member, 5a ... one end of holding member, 5b ... other end of holding member 5c ... substantially frustoconical tapered surface, 51 ... elongated hole, 52 ... holding portion, 53 ... ring portion,
6 ... Sleeve, 61 ... Supporting part, 61a ... Concave part with a substantially arc-shaped cross section, 62 ... Sleeve part, 62a ... Slit 7 ... Movable member, 71 ... Projection, 72 ... Outer peripheral surface, 73 ... Planar part, 7a ... Edge part, 7b ... Ring part 8 ... Elastic member (coil spring), 8a ... Small diameter side, 8b ... Large diameter side 9 ... Detaching member, 91 ... Wedge projection, 92 ... Back part, 93 ... Front part, 94 ... Rear part 10 ... Connection pipe 10a ... end face, 10b ... outer peripheral surface 17 ... holding member, 17a ... edge, 17b ... ring part, 17b1 ... long hole part, 17c ... one end part of holding member, 17d ... other end part of holding member, 17e ... plane part

Claims (9)

A joint body having a through-hole through which fluid flows, a connecting pipe inserted into the through-hole, and a seal member for sealing the joint body, are mounted on the joint body so as to be movable in the axial direction of the through-hole. A pipe fitting comprising:
A retaining member that is pressed against the outer peripheral surface of the connecting pipe by the movement of the push ring,
A holding member for holding the retaining member,
The pipe joint according to claim 1, wherein the retaining member is held so as to be movable relative to the holding member in a moving direction of the push wheel.   2. The pipe joint according to claim 1, wherein an inner peripheral surface of the push ring has a tapered surface whose diameter increases toward the joint body.   The holding member has a hole extending in the axial direction of the holding member and penetrating in the radial direction of the holding member so that the retaining member can be incorporated so as to face the inner peripheral surface of the push ring. The pipe joint according to claim 1 or 2, wherein the pipe joint is provided.   The hole portion provided in the holding member is formed with a gap along a moving direction of the holding member when the retaining member is assembled. Pipe fittings.   When the push wheel moves toward the joint body and the retaining member is locked to the outer peripheral surface of the connecting pipe, the hole portion passes through the retaining member, and the gap in the hole portion moves. The pipe joint according to any one of claims 1 to 4.   The pipe joint according to any one of claims 1 to 5, wherein the hole portion is provided with means for preventing the drop-off member from falling off.   The pipe joint according to claim 6, wherein the drop-off prevention means is a protrusion formed on at least one of the surface portions of the hole portion along the moving direction of the holding member.   The pipe joint according to any one of claims 1 to 7, wherein the push wheel is attached to the joint body so as to be slidable in an axial direction of the through hole. The pipe joint according to any one of claims 1 to 7, wherein the push wheel is attached to the joint body by screwing.

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