JP2007309450A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To find leakage of a pipe joint in making a test with pressed water (or air) to the pipe joint after a connecting pipe is inserted in the pipe joint. <P>SOLUTION: In this pipe joint 1, a seal groove 12 is provided along the outer peripheral surface 10b of the connecting pipe 10 so that a seal member 4 can be moved along the outer peripheral surface 10b of the connecting pipe 10, and the seal member 4 is moved along the outer peripheral surface 10b of the connecting pipe 10 in the seal groove 12 by pressing in the direction of a presser ring 3 from the joint body and pushed out of the seal groove 12, and a movable member 7 adjacent to the seal groove 12 is also moved by the seal member 4 so that the movable member 7 is also moved along the outer peripheral surface 10b of the connecting pipe 10, thereby compressing an elastic member 8 abutting on the movable member 7, whereby a gap is formed between the end part of the seal groove 12 and the seal member, so that water (or air) which is a fluid applying pressure from the joint body 2 in the direction of the presser ring 3 can leak through the gap. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint capable of confirming a connection failure between a connection pipe (pipe) inserted into a pipe joint and a joint body.

  Regarding the structure of a conventional leakage detection mechanism for water or air, the structures shown in FIGS. 26 and 27 are disclosed. In FIG. 26, the female threaded portion 111 of the nut 103 fitted on the thin stainless steel pipe 101 is screwed into the male threaded portion 109 of the joint body 102, and the first contact surface 118 located on the outer peripheral side of the distal end of the female threaded portion 111 is colored. The projection 113 of the colored stop ring 114 is crushed by the first abutment surface 118 by being brought into contact with the distal end surface of the stop ring 114 and further tightened. The O-ring 107 is compressed at the bottom of the ring housing groove 108 to connect the joint body 102 and the thin stainless steel pipe 101 in a sealed state. In this connection work, the protrusions 113 of the colored stop ring 114 are crushed by the first contact surface 118 and become invisible, and the nut 103 is tightened and confirmed to be connected (Patent Document) 1).

  Next, the connection mechanism disclosed in FIG. 27 will be described. In FIG. 27, the male screw 208 formed on the outer periphery of the end portion of the joint 202 and the female screw of the female screw portion 211 of the nut 203 are screwed in until the joint contact surface 212 of the nut 203 comes into contact with the tip of the joint 202. The angled protrusion 206 of the thin stainless steel tube 201 is fixed by being clamped by the tapered part 207a of the joint, the second notch 213 of the nut 203 and the packing 204, and the packing 204 is an inclined surface of the angled protrusion 206. 206a, the packing fitting portion 207b, and the joint contact surface 212 are in close contact with each other while being compressed, and the leakage of the fluid flowing in the thin stainless steel pipe 201 is prevented.

  In such a connection mechanism, by screwing and fixing the female thread of the female threaded portion 211 of the nut 3 to the male thread 208 of the joint 202, the marker 205 externally fitted in the marker groove 202a of the joint 202 is hidden by the presence of the nut 203, As a result, the base color or the predetermined color colored on the outer peripheral surface cannot be seen. By utilizing this phenomenon, if the female thread of the female thread portion 211 of the nut 203 is screwed into the male thread 208 of the joint 202 and the color of the marker 205 can be recognized without being hidden by the presence of the nut 203, it is determined that the connection is incomplete. Conversely, if the color of the marker 205 is hidden by the presence of the nut 203 and cannot be seen, it can be determined that the connection is complete (Patent Document 2).

Japanese Patent No. 3124246 (paragraph 0017 to paragraph 0019 FIG. 3) Japanese Patent No. 3082074 (paragraph 0014 to paragraph 0015 FIG. 3)

  FIGS. 26 and 27 show confirmation of the connection completion between the joint body (joint body 102, joint 202) and the connection pipe (thin wall stainless steel pipes 101, 201), which is a confirmation of completion of construction. ) And the change in the color of the indicator or the like (the color of the marker 205). Specifically, in the connection mechanism shown in FIG. 26, the protrusions 113 of the colored stop ring 114 are crushed by the first contact surface 118 and the colored stop ring 114 becomes invisible, so that the nut 103 is tightened. In the connection mechanism shown in FIG. 27, the female thread of the female thread part 211 of the nut 203 is screwed into the male thread 208 of the joint 202, and the color of the marker 205 is determined by the presence of the nut 203. If it is hidden and disappears, it is judged as a complete connection.

  Therefore, in a narrow place or a dark place, there is a possibility of overlooking the poor connection between the joint body (joint body 102, joint 202) and the connection pipe (thin-walled stainless steel pipe 101, 201). In general, a pipe joint portion is subjected to a water pressure (or air pressure) test after completion of the pipe construction. In this water pressure (or air pressure) test, the pipe body is connected to the joint body (joint body 102, joint 202). By detecting the presence or absence of water (or air) leakage from the connection portion with the pipe (thin stainless steel pipe 101, 201), the construction failure due to forgetting to tighten the nut (103, 203) is confirmed. When the nut is forgotten to be tightened, a leak is generated by the water pressure test, so that the connection between the joint body (joint body 102, joint 202) and the connection pipe (thin stainless steel pipes 101 and 201) is performed again.

  However, in the conventional pipe joint, when the connection pipe (thin stainless steel pipe 101, 201) is inserted into the joint body (joint body 102, joint 202), or when the press ring (nuts 103, 203) is manually tightened, A constant surface pressure is applied to the joint body (joint body 102, joint 202) and the connecting pipe (thin stainless steel pipe 101, 201) by the members (O-ring 107, packing 204), and water (or air) leaks. Therefore, there is a possibility that a construction failure in connection between the joint body (joint body 102, joint 202) and the connection pipe (thin stainless steel pipe 101, 201) may be overlooked.

  In recent years, in some pipe joints, there is a pipe joint with a mechanism for finding a construction failure due to leakage of water (or air) during a test using water pressure (or air). However, it is set so that a gap is formed between the seal member and the connecting pipe when you forget to tighten the nut. Due to the dead weight of the piping at the time of vertical piping, the gap is clogged, the sealing member and the connecting pipe are in close contact, and depending on how the surface pressure is applied to the sealing member, water (or air) may or may not leak. Leakage performance is not stable. That is, there has been a problem that variations in detection of the presence or absence of water (or air) leakage vary depending on the arrangement of the pipes.

  The present invention has been made in view of the above circumstances, and after inserting the connection pipe into the pipe joint, a connection failure between the pipe joint and the connection pipe (water (or It is an object of the present invention to provide a pipe joint provided with a leak detection mechanism that enables detection of air) leak).

  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 connecting pipe inserted into the through hole, and a seal for sealing the joint body. In a pipe joint comprising a member and a push ring attached to the joint body so as to be movable in the axial direction of the through hole, the seal body is movable along the outer peripheral surface of the connection pipe. And a seal groove provided along the outer peripheral surface of the connecting pipe.

  Therefore, according to the first aspect of the present invention, after the connection pipe is inserted into the pipe joint, the seal member in the seal groove is formed in the seal groove formed by the insertion of the connection pipe. And the inner circumferential surface (second stepped portion) of the joint body including the flange wall of the seal groove is also in close contact with each other. The seal member moves away along the outer peripheral surface of the joint body along the outer peripheral surface of the joint pipe and the outer peripheral surface of the connection pipe along the outer peripheral surface of the connection pipe in the direction of the push ring in the seal groove. The member can be pushed out of the seal groove.

  According to a second aspect of the present invention, there is provided a joint main body having a through hole through which a fluid flows, a connecting pipe inserted into the through hole, a seal member for sealing the joint main body, and the joint main body. And a pusher wheel movably mounted in the axial direction of the through-hole, wherein the joint body has the seal member movable along the outer peripheral surface of the connection pipe, and the outer periphery of the connection pipe It is characterized by comprising a seal groove provided along the outer peripheral surface of the connecting pipe, provided with a recess capable of holding the outer peripheral surface of the seal member in a direction along the surface.

  Therefore, according to the invention described in claim 2, after the connection pipe is inserted into the pipe joint, the seal member in the seal groove is formed in the seal groove formed by the insertion of the connection pipe. And the inner circumferential surface (second stepped portion) of the joint body including the flange wall of the seal groove is also in close contact with each other. The seal member moves away along the outer peripheral surface of the joint body along the outer peripheral surface of the joint pipe and the outer peripheral surface of the connection pipe along the outer peripheral surface of the connection pipe in the direction of the push ring in the seal groove. The member can move to the recess provided in the seal groove.

  Furthermore, the invention described in claim 3 is a joint body having a through hole through which a fluid flows, a connection pipe inserted into the through hole, a seal member for sealing the joint body, and the joint body. And a pusher wheel movably mounted in the axial direction of the through hole, wherein the joint body is configured so that the seal member is movable along an outer peripheral surface of the connection pipe. A seal groove provided along the outer circumferential surface is provided, is movable in the direction of the seal groove, and is detachable from the holding member provided to be movable along the outer circumferential surface of the connection pipe. And a sleeve that is formed integrally or separately and that holds the seal member in the vicinity of the seal groove.

  Therefore, according to the third aspect of the present invention, after the connection pipe is inserted into the pipe joint, the seal member stays in close contact with the outer peripheral surface of the connection pipe, and the holding ring moves to move the seal groove by the holding member. It can be pushed inside.

  Even after the connection pipe is inserted into the joint body, the seal member in the direction along the outer peripheral surface of the connection pipe is out of the seal groove, and pressing the push ring into the joint body adds pressure to the holding member. Since the holding member can press the seal member and the seal member can be accommodated in the seal groove, even if the already inserted connection pipe is pulled out, no excessive force acts on the seal member. It is possible to prevent twisting. In addition, since the contact surface is opposed to the outer peripheral surface of the connecting pipe and expands in the direction of the pusher wheel, the seal member can be easily stored in the seal groove by pressing with the pusher wheel. Further, since a sleeve for holding the seal member is incorporated in the vicinity of the seal groove, it is possible to prevent the seal member from being damaged by the end face of the connecting pipe.

  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 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 fourth 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 to each other, 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 portion, and the outer peripheral surface of the press ring is slid with respect to the inner peripheral surface of the joint body. The connection between the joint body and the connecting pipe is completed by overlapping the grooves on the outer peripheral surface of each other and fitting the stop ring into the grooves.

  Furthermore, the invention according to claim 5 is characterized in that, in addition to the structure according to any one of claims 1 to 3, the push wheel is attached to the joint body by screwing.

  Therefore, according to the fifth aspect of the present invention, the threaded groove provided on the outer peripheral surface of the joint body and the thread groove provided on the outer peripheral surface of the press ring are screwed together and screwed to advance the joint body and the connecting pipe. Complete the connection with.

  According to the present invention, when the connection pipe is inserted into the pipe joint, the seal member that is in close contact with the joint main body (second stepped portion) and the outer peripheral surface of the connection pipe is connected to the through hole in the pipe joint. By applying pressure by water (or air) which is a fluid, the seal member is moved along the outer peripheral surface of the connecting pipe, and a gap is formed between the seal groove and the seal member, or the seal member is sealed. Therefore, the necessary surface pressure is not generated, so that leakage of water (or air) that is a fluid can be easily realized. Therefore, even if a constant surface pressure is applied between the joint body and the connecting pipe by the seal member before the press ring is fixed to the joint body, the place where the pipe joint is installed such as a vertical pipe It is possible to detect leakage of water (or air) which is a fluid at any location. Therefore, it is possible to prevent leakage due to forgetting to push the push wheel.

  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. As shown in FIG. 1, the outer side of the joint body 2 of the pipe joint 1 is provided with a step portion 2c at a substantially central portion in the longitudinal direction. An outer peripheral surface 2e is formed with a diameter, 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. An outer peripheral surface 2g is formed with a certain diameter from the step 2c to the other end 2b, and has a constant diameter, and is inclined with a diameter smaller than the diameter from the step 2c to the inclined surface 2d via the inclined surface 2d. A tapered male screw 2f is formed from 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 is tapered so as to increase in diameter toward the 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 that expands 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, which is 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 extends 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 which is the movable member 7 is made of polyolefin. However, the movable member 7 is not limited to polyolefin, and can be used as a material of the movable member 7 as long as it is a crosslinked PE or the like.

  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. That is, the large-diameter side 8 b of the coil spring 8 is incorporated so as to abut on the flat surface portion 73 of the movable member 7.

  However, it is also possible to incorporate the coil spring 8 so that the small diameter side of the coil spring 8 is in contact with the flat 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 protruding from the tapered circumferential groove 22 a in the joint body 2 is in a circumferential groove 31 of the push ring 3.

  A through hole 35 penetrating from one end 3d to the other end 3e is provided along the longitudinal direction of the pusher wheel 3 to form a cylindrical shape. On the inner peripheral surface 3 f of the pusher wheel 3, a tapered surface 32 is formed that expands in the direction from one end 3 d of the pusher wheel 3 toward the other end 3 e. 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.

  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. 1, the holding member 5 is a cylindrical member, has a substantially truncated cone shape, and has an outer periphery in a direction from one end 5 a to the other end 5 b of the holding member. The part is formed so as to expand its 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. The other end portion 5b of the holding member 5 is formed with a ring portion 53. The ring portion 53 extends along the through hole 21, and the ring portion 53 is formed on the coil spring 8 as shown in FIG. (The diameter reducing side (small diameter side 8a)) is in contact with the inner diameter side.

  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.

  Further, as shown in FIG. 1, a retaining member 9 is incorporated in the holding member 5. A long hole 51 is formed in the holding member 5 along the direction of the through hole 21, and the retaining member 9 is incorporated in the long hole 51. A holding portion 52 for holding the retaining member 9 is provided in the long hole portion 51 to hold the retaining member 9 incorporated in the long hole portion 51. Further, the retaining member 9 is formed with a wedge-shaped projection 91 for locking to the outer peripheral surface 10 b of the connecting pipe 10 inserted into the through hole 21.

  In addition, in this example, although the connection pipe 10 forms austenitic stainless steel (SUS304), it 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, the process of inserting the connecting pipe 10 into the pipe joint 1 having the above configuration will be described with reference to FIG.

  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. If the connection tube 10 continues to be inserted even if it comes into contact, the retaining member 9 expands on the inner diameter side along the tapered surface 32 of the pusher wheel 3 until the wedge-shaped protrusion 91 engages with the outer peripheral surface 10 b of the connection tube 10. Move in the 10 insertion direction. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 together with the retaining member 9.

  Even if the connecting tube 10 is further inserted in this state, the holding member 5 is pressed (biased) by the coil spring 8 and therefore does not move further in the inserting direction of the connecting tube 10. That is, even if the wedge-shaped protrusion 91 moves to a position where it is locked to the outer peripheral surface 10 b of the connecting pipe 10 and the connecting pipe 10 is further inserted after passing through the retaining member 9, the retaining member 9 is inserted in the connecting direction of the connecting pipe 10. The wedge-shaped projection 91 of the retaining member 9 slides (slides) on the outer peripheral surface 10b of the connection pipe 10 without moving to the position.

  Then, the insertion continues into the through hole 21 of the connection pipe 10, the end face 10 a of the connection pipe 10 reaches the support portion 61 of the sleeve 6, and the end face 10 a of the connection 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. It moves to the end surface 22c of the 1st step part 22 which is the insertion direction. When the connecting pipe 10 is further inserted after the movable member 7 reaches the end surface 22c, the sleeve portion 62 of the sleeve 6 that has been in contact with the movable member 7 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. As the movable member 7 moves, the sleeve 6 that is in contact with the movable member 7 also moves in the moving direction of the connecting pipe 10. Further, the seal member 4 is pressed from the outer peripheral surface 10 b of the connecting pipe 10, and the seal member 4 presses the second step portion 23.

  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 the slit portion 62 is provided with a plurality of slits 62a, so that the sleeve portion 62 is provided on the inclined surface 24a. , The enlarged slit portion 62 is bent in accordance with the diameter of the third step portion 24.

  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 pressing by the end surface 23a (sealing wall 23a1 of the sealing groove) 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. Deform as shown. 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. . As described above, the second step portion 23 and the outer peripheral surface 10b of the connection pipe 10 sandwiching the seal member 4 are the outer periphery of the connection pipe 10 as shown in FIG. A seal groove 12 is formed along the surface 10b.

  As described above, when the seal groove 12 is formed, 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, the end surface 10 a of the connection pipe 10 reaches the end surface 24 b of the joint body 2 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. Even if an external force is applied in the direction in which the connection pipe 10 is pulled out in this state, the wedge-shaped protrusion 91 of the retaining member 9 that contacts the tapered surface 32 of the pusher wheel 3 is engaged with the outer peripheral surface 10 b of the connection pipe 10. The connecting pipe 10 is not pulled out.

  Next, the push wheel 3 is pushed into the joint body 2 to complete the construction. That is, as shown in FIG. 3, the pusher wheel 3 is pushed into the joint body 2, and the outer peripheral surface 3 a of the pusher wheel 3 moves in the joint body 2 (first step portion 22). 2 is moved from the tapered circumferential groove 22a of the joint body 2 to the tapered circumferential groove 22b, and enters and is fixed into the tapered circumferential groove 22b.

  At this time, the retaining member 9 is pressed by the tapered surface 32 formed on the inner diameter of the pusher wheel 3 and moves in the radial direction of the connecting tube 10, and the wedge-shaped protrusion 91 of the retaining member 9 deforms the connecting tube 10 while deforming the connecting tube 10. 10 bite into the outer periphery. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 when the one end 5 a of the holding member 5 is pushed by the one end 3 d of the pusher wheel 3. The coil spring 8 is compressed to the end by the other end 5b of the holding member 5 and further pushed until the movable member 7 comes into contact with the end surface 22c. 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 is compressed by 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, the outer peripheral surface 10 b of the connection pipe 10, and the movable member 7. Connection with the connecting pipe 10 is performed. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. The connection is also completed.

  Next, the leak detection of the pipe joint 1 in which the connection pipe 10 is inserted in this way is performed. 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 the pipe joint 1 in which the presser wheel 3 is not fixed to the joint body 2 after the connection pipe 10 is inserted may be generated depending on the situation at the site. 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 the leak detection, it is confirmed that water or air leaks reliably by applying a pressure by water (or air) as a fluid to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. In this example, the test which confirms that water leaks by applying the press by flowing water into the pipe joint 1 (through-hole 21) from the arrow A direction of FIG. However, it is also possible to apply pressure by water (or air) that is a fluid from the direction of arrow E shown in parentheses in FIG.

  When water flows from the direction of arrow A in FIG. 4 to the through-hole 21 in the joint body 2, pressure due to water pressure is applied to the pipe joint 1. Water flows in the connecting pipe 10 in the pipe joint 1 in the direction of arrow B, and also flows in the direction of the arrow C to the third step portion 24 side, which is the inner peripheral surface in the joint body 2, to flow water. Pressure (water pressure) is applied. The water that has flowed to the third step portion 24 side reaches the sleeve 6, flows out from the slit 62 a of the sleeve 6, etc., and the inner peripheral surface (third step portion 24) in the joint body 2 and the connection pipe 10. It flows between the outer peripheral surface 10b. When the water passes through the third step portion 24, the water flows out between the second step portion 23 and the outer peripheral surface 10 b of the connection pipe 10 (seal groove 12).

  The water flowing out to the seal groove 12 hits the seal member 4 in the seal groove 12 and applies a pressure that moves the seal member 4 in the arrow B direction. Therefore, pressure is applied to the seal member 4 and the seal member 4 moves in the direction of arrow B. As the seal member 4 moves along the outer peripheral surface 10b of the connecting tube 10, the movable member 7 that is in contact with the seal member 4 also moves in the arrow B direction. As shown in FIG. 5, the coil spring 8 is compressed in the direction of arrow B because the small diameter side 8 a is in contact with the holding member 5 by the movement of the movable member 7. As water continues to flow to the second step portion 23, 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 inserted into the seal groove 12 as shown in FIG. 5. It moves away from the wall 23a1, moves along the outer peripheral surface 10b of the connecting pipe 10, is pushed out of 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 face 22c) and the seal member 4, or the seal surface pressure cannot be ensured, and the water flowing into the seal groove 12 is in the direction of arrow D shown in FIG. To the first step 22. Thus, water leaks when water flows out to the first step portion 22.

  As described above, when the leak detection is performed and the occurrence of the 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 in FIG. 3, the pusher wheel 3 is fixed to the joint body 2 after the connection pipe 10 is inserted as described above. By pushing the pusher wheel 3 into the joint body 2, the retaining member 9 moves in the radial direction of the connecting tube 10, and the wedge-shaped protrusion 91 of the retaining member 9 bites into the outer peripheral portion of the connecting tube 10 while deforming the connecting tube 10. At this time, the holding member 5 is pressed against one end 5a of the holding member 5 at one end 3d of the push wheel 3, and the coil spring 8 is compressed to the end by the other end 5b of the holding member 5. Then, the movable member 7 moves (presses in) until it abuts against the end surface 22c, and the coil spring 8 is compressed to the end, so that the movable member 7 is restrained in the axial direction by the end surface 22c and the coil spring 8.

  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 connection pipe 10, and the movable member 7, and the joint body. 2 and the connecting pipe 10 are connected. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. Connection is completed and piping work is completed.

(Example 2)
FIG. 6 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. 6 has substantially the same shape as in Example 1, is provided with a step portion 2c, an outer peripheral portion 2e, an outer surface portion 2g, and an inclined surface 2d. A tapered male 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. 6, 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. 6, 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 annular groove 23b having an arcuate cross section is formed larger than the outer diameter of the seal member 4, and the arc of the annular groove 23b having an arcuate section can also include the wire 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 from one end 2a to the other end 2b, The diameter is reduced by 24 and 25.

  As shown in FIG. 6, the O-ring 4 is incorporated in the second step portion 23 in the joint 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. 6, the movable member 7 is a ring-shaped member, and includes an edge portion 7a and a ring portion 7b. The outer peripheral surface 72 of the edge 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. In the same manner 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, similarly to Example 1, the holding member 5 is incorporated in the pusher wheel 3, and the wedge-shaped projection 91 of the retaining member 9 in the holding member 5 protrudes toward the through hole 21.

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

  The process of inserting the connecting pipe 10 into the pipe joint 100 is basically the same as in Example 1. When the connection pipe 10 is inserted into the through hole 21 (through hole 35) from the pusher wheel 3 side, the connection pipe 10 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. When the connection pipe 10 continues to be inserted, the retaining member 9 expands on the inner diameter side along the tapered surface 32 of the pusher wheel 3, and the insertion direction of the connection pipe 10 reaches a position where the wedge-shaped projection 91 is locked to the outer peripheral surface 10 b of the connection pipe 19 Move to. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 together with the retaining member 9. Even if the connection pipe 10 is further inserted in this state, the holding member 5 is pressed (biased) by the coil spring 8 and therefore does not move in the insertion direction of the connection pipe 10. That is, even if the wedge-shaped protrusion 91 moves to a position where it is locked to the outer peripheral surface 10 b of the connecting pipe 10 and the connecting pipe 10 is further inserted after passing through the retaining member 9, the retaining member 9 is inserted in the connecting direction of the connecting pipe 10. The wedge-shaped projection 91 of the retaining member 9 slides (slides) on the outer peripheral surface 10b of the connection tube 10 without moving to the position.

  The sleeve 6 is pushed by the end surface 10 a of the connecting pipe 10 to enter the third step portion 24 and is pressed (biased) by the coil spring 8, and the edge portion 7 a of the movable member 7 is the end surface of the first step portion 22. 22c, the seal member 4 is sandwiched between the ring portion 7b and the end surface 23a of the second step portion 23 in the second step portion 23, and the ring portion 7b of the movable member 7 contacts the seal member 4. Touch. 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 (sealing wall 23a1 of the seal groove) and the ring portion 7b of the movable member 7. It deforms 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.

  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. . The insertion continues into the through hole 21 of the connection pipe 10 in a state where it abuts on the support portion 61 of the sleeve 6, and the end surface 10 a of the connection tube 10 that abuts on the support portion 61 of the sleeve 6 is the end surface of the joint body 2. By reaching 24b, the insertion of the connecting pipe 10 is completed.

  Next, the push wheel 3 is pushed into the joint body 2 to complete the construction. That is, as shown in FIG. 8, the pusher wheel 3 is pushed into the joint body 2, and the retaining member 9 is pressed by the tapered surface 32 formed on the inner diameter of the pusher wheel 3 and moves in the radial direction of the connecting pipe 10. The wedge-shaped projection 91 of the retaining member 9 bites into the outer peripheral surface 10 b of the connection pipe 10 while deforming the connection pipe 10. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 when the one end 5 a of the holding member 5 is pushed by the one end 3 d of the push ring 3. The coil spring 8 is compressed to the end by the other end 5b of the holding member 5 and is pushed in until the movable member 7 comes into contact with the end surface 22c. At this time, the movable member 7 of the coil spring 8 is restrained in the axial direction by the end face 22 c and the coil spring 8.

  The seal member 4 is compressed by 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, the outer peripheral surface 10 b of the connection pipe 10, and the movable member 7. Connection with the connecting pipe 10 is performed. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. Connection is complete.

  Next, as in Example 1, leakage detection is performed on the pipe joint 100 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. 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 2 will be described.

  In the leak detection, it is confirmed that water or air leaks by applying a pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of the arrow in FIG. In Example 2, a test for confirming that water leaks from the direction of arrow A in FIG. 9 to the pipe joint 1 (through hole 21) by applying pressure by flowing water to the pipe joint 1 is performed. However, pressure by water (or air) that is a fluid can be applied from the direction of arrow E shown in parentheses in FIG.

  As water flows from the direction of arrow A in FIG. 9 to the through hole 21 in the joint body 2, pressure due to water pressure is applied to the pipe joint 100. The water flows in the connecting pipe 10 in the pipe joint 1 in the direction of the arrow B, and the water also flows in the direction of the arrow C to the third step portion 24 side, which is the inner peripheral surface in the joint main body 2. Pressing (water pressure) is applied. The water that has flowed to the third step portion 24 side reaches the sleeve 6, flows out of the slit 62 a of the sleeve 6, and the like, and is formed between the third step portion 24 in the joint body 2 and the outer peripheral surface 10 b of the connection pipe 10. Flowing between. When the water passes through the third step portion 24, the water flows out between the second step portion 23 and the outer peripheral surface 10 b of the connection pipe 10 (seal groove 12).

  The water flowing out to the seal groove 12 hits the seal member 4 in the seal groove 12 and applies a pressure that moves the seal member 4 in the arrow B direction. Therefore, the seal member 4 moves away from the flange wall 23a1 of the seal groove 12 in the arrow B direction, and starts to move along the outer peripheral surface 10b of the connection pipe 10 (see FIG. 10). As the seal member 4 moves along the outer peripheral surface 10b of the connecting tube 10, the movable member 7 that is in contact with the seal member 4 also moves in the arrow B direction. As the movable member 7 moves, the coil spring 8 is compressed in the direction of arrow B (see FIG. 10) because the small diameter side 8a of the coil spring 8 is in contact with the holding member 5.

  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 through the movable member 7, and the seal member 4 is applied to the outer peripheral surface 10 b of the connection pipe 10 as shown in FIG. 10. Then, the seal groove 12 is moved in the direction of arrow B, and enters the annular groove 23b having an arcuate cross section capable of holding the outer peripheral surface 4b of the seal member 4 of the second step portion 23. 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 flows out to the first step portion 22 along the arrow D direction. Thus, water leaks when water flows out to the first step portion 22.

  As described above, when leakage is detected and occurrence of leakage is confirmed, it is confirmed that the pusher wheel 3 is not fixed to the joint body 2 in the pipe joint 100.

  In this case, similarly to Example 1, as shown in FIG. 8, the pusher wheel 3 is pushed into the joint body 2, the wedge-shaped protrusion 91 of the retaining member 9 is bitten into the outer peripheral portion of the connection pipe 10, 3 is pressed, and the coil spring 8 is compressed by the pressing. Then, the movable member 7 moves (presses in) until it abuts against the end surface 22c, and the coil spring 8 is compressed to the end, so that the movable member 7 is restrained in the axial direction by the end surface 22c and the coil spring 8. At this time, 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 connection pipe 10, and the movable member 7. The main body 2 and the connecting pipe 10 are connected. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. Connection is completed and piping work is completed.

  In the pipe joint 100 used in this example, the second step portion 23 is provided with the annular groove 23b having an arcuate cross section. Therefore, when the connection pipe 10 is inserted, some trouble 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, insertion of the connection pipe 10 into which the seal member 4 is inserted is not hindered. That is, the circular groove 23b having an arcuate cross section is formed in the second step portion 23 so that when the seal member 4 enters, the inner diameter side 4a of the seal member 4 becomes deep enough not to prevent insertion of the connecting pipe 10. This is because, when the connecting tube 10 is pulled out, the seal member 4 moved together with the connecting tube 10 moves to the annular groove 23b and remains in the annular groove 23b 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. 11 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 body 2 of the pipe joint 200 shown in FIG. 11 has substantially the same shape as in 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. 11, 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 is continuous with the second step portion 23. The diameter is increased from 23 toward the first step portion 22 (expanded in the direction of the pusher wheel 3). The inclined surface 22 d serves as a guide when the seal member 4 enters the second step portion 23.

  As shown in FIG. 11, the sleeve 6 is incorporated in the joint body 2 from the first step portion 22 to the second step portion 23. 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 5 is incorporated adjacent to the small diameter side 8 a of the coil spring 8. As shown in FIG. 11, the holding member 5 is a ring-shaped member and includes an edge portion 5 d and a ring portion 53. The ring portion 53 is provided with a long hole portion 51 that is a hole portion, and the retaining member 9 is incorporated in the long hole portion 51. 12, the edge 5d of the holding member 5 is movable along the first step portion 22, and the ring portion 53 enters the small diameter side 8a of the coil spring 8 and enters the through hole 21. Along the direction of the seal member 4.

  The pusher wheel 3 is incorporated in the joint body 2 so as to cover the ring portion 53 in which the retaining member 9 is incorporated. As shown in FIG. 11, a circumferential groove 33 is formed on the outer circumferential surface 3 a of the pusher wheel 3 in this example in addition to the circumferential groove 31, 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 (polyethylene) or PP (polypropylene). 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.

  First, the insertion of the connecting pipe 10 into the pipe joint 200 is basically the same as in Example 1 and Example 2. When the connecting pipe 10 is inserted into the pipe joint 200, the retaining member 9 expands on the inner diameter side along the tapered surface 32 of the pusher wheel 3, and the connecting pipe 10 reaches a position where the wedge-shaped protrusion 91 is locked to the outer peripheral surface 10 b of the connecting pipe 19. Move in the insertion direction. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 together with the retaining member 9. Even if the connection pipe 10 is further inserted in this state, the holding member 5 is pressed (biased) by the coil spring 8 and therefore does not move in the insertion direction of the connection pipe 10.

  That is, even if the wedge-shaped protrusion 91 moves to a position where it is locked to the outer peripheral surface 10 b of the connecting pipe 10 and the connecting pipe 10 is further inserted after passing through the retaining member 9, the retaining member 9 is inserted in the connecting direction of the connecting pipe 10. The wedge-shaped projection 91 of the retaining member 9 slides (slides) on the outer peripheral surface 10b of the connection tube 10 without moving to the position. Further, when the connecting pipe 10 is further inserted after the end surface 10a of the connecting pipe 10 reaches the end of the sleeve 6 formed integrally or separately with the holding member 5 and separable from the holding member 5, the holding member is inserted. 5 and the sleeve 6 are separated. At this time, since the holding member 5 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 connecting 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 connecting pipe 10 Thus, the seal groove 12 is formed along the outer peripheral surface 10 b of the connection pipe 10.

  Next, the push wheel 3 is pushed into the joint body 2 to complete the construction. First, as shown in FIG. 13, the pusher wheel 3 is pushed into the joint body 2, and the retaining member 9 moves in the radial direction of the connecting pipe 10 along the tapered surface 32 formed on the inner diameter of the pusher wheel 3. The wedge-shaped protrusion 91 bites into the outer peripheral surface 10 b of the connecting pipe 10. At this time, the holding member 5 is pushed by the pusher wheel 3 and moves in the insertion direction of the connecting pipe 10. Then, the coil spring 8 is compressed by the edge portion 5d of the holding member 5, the ring portion 53 of the holding member 5 presses the seal member 4, and the seal member 4 is moved into the seal groove 12 using the inclined surface 22d as a guide. . At this time, the coil spring 8 is restrained in the axial direction by the edge 5d of the holding member 5 and the end face 22c.

  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 connection pipe 10, and the ring portion 53 of the holding member 5. The joint body 2 and the connecting pipe 10 are connected. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. Connection is complete.

  In this example, an indicator 34 is inserted into the circumferential groove 33 of the pusher wheel 3, and when the pusher wheel 3 is pushed into the joint body 2, the indicator of the pusher wheel 3 is inserted into one end 2a of the joint body. 34 approaches. 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.

  Next, as in Example 1 and Example 2, leakage detection is performed on the pipe joint 200 into which the connection pipe 10 is 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. 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, it is confirmed that water or air leaks by applying a pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. 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. However, pressure by water (or air) that is a fluid can be applied from the direction of arrow E shown in parentheses in FIG.

  As water flows from the direction of the arrow A in FIG. 14 to the through hole 21 in the joint body 2, the water pressure is applied to the pipe joint 200. Water flows in the connecting pipe 10 in the pipe joint 200 in the direction of arrow B. At the same time, the water flowing in the direction of arrow B between the third step portion 24 of the joint body 2 and the end surface 10a of the connecting pipe 10 and flowing to the third step portion 24 side is the second step portion 23 side. To flow (flow into the seal groove 12) and press the seal member 4. Therefore, a pressure (water pressure) is applied to move the seal member 4 in the direction of arrow B.

  As the water continues to flow to the second step portion 23, the pressure continues to be applied to the seal member 4. Therefore, the seal member 4 is separated from the inclined surface 22d, and the seal member 4 moves along the outer peripheral surface 10b of the connection pipe 10 in the direction of arrow B, and the holding member 5 (the ring portion 53) that is in contact with the seal member 4 Also moves in the direction of arrow B. As shown in FIG. 15, the small diameter side 8 a of the coil spring 8 is in contact with the holding member 5 due to the movement of the holding member 5, so that the coil spring 8 extends in the arrow B direction.

  As the seal member 4 moves along the outer peripheral surface 10b of the connecting pipe 10, a gap is formed between the inclined surface 22d and the seal member 4 as shown in FIG. 15, or a seal surface pressure is ensured. The water that has flowed to the second step portion 23 flows out to the first step portion 22 along the arrow D direction. Thus, water leaks when water flows out to the first step portion 22. As described above, when the leak detection is performed and the occurrence of the leak is confirmed, it is confirmed that the pusher wheel 3 is not fixed to the joint body 2 in the pipe joint 200.

  In this case, as in Example 1 and Example 2, as shown in FIG. 13, the pusher wheel 3 is pushed into the joint body 2, and the wedge-shaped protrusion 91 of the retaining member 9 is bitten into the outer peripheral portion of the connection pipe 10. Pressing is applied, and the coil spring 8 is compressed by the pressing. Then, the edge 5d of the holding member 5 is moved (pressed) to the end face 22c, and the coil spring 8 is compressed to the end (see FIG. 13). At this time, due to the pressing of the ring portion 53 of the holding member 5, the seal member 4 moves on the outer peripheral surface 10b of the connecting pipe 10, and is guided by the inclined surface 22d to enter the seal groove 12 (see FIG. 13).

  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 connection pipe 10, and the ring portion 53 of the holding member 5. Then, the joint body 2 and the connecting pipe 10 are connected. Further, the stop ring 11 enters the tapered circumferential groove 22 b 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, whereby the joint body 2 and the connection pipe 10 are connected. Connection is completed and piping work is completed. In this example, since the indicator 34 is used, it is 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 completed even if the indicator 34 is obscured. it can.

(Example 4)
FIG. 16 shows a pipe joint 300 that 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 main body 2 of the pipe joint 300 shown in FIG. 16 has the same shape as that of Example 1, and has a cylindrical shape provided 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. 16, 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. 16, 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. Further, a retaining member 9 is incorporated in the ring portion 7b of the movable member 7 in the pusher wheel 3, and a wedge-shaped projection 91 of the retaining member 9 protrudes to the through hole 21 side.

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

  The process of inserting the connecting pipe 10 into the pipe joint 300 is basically the same as in Example 1. The connecting pipe 10 is inserted into the through hole 21 (through hole 35) from the side of the pusher wheel 3 and comes into contact with the wedge-shaped protrusion 91 of the retaining member 9, and the retaining member 9 expands on the inner diameter side along the tapered surface 32 of the retaining wheel 3 to form a wedge shape. The protrusion 91 moves in the insertion direction of the connection pipe 10 to a position where it is locked to the outer peripheral surface 10b of the connection pipe 19. At this time, the holding member 5 moves in the insertion direction of the connecting pipe 10 together with the retaining member 9. Even if the connecting pipe 10 is further inserted in this state, the holding member 5 is pressed by the coil spring 8 and therefore does not move further in the inserting direction of the connecting pipe 10. That is, even when the wedge-shaped protrusion 91 moves to a position where it is locked to the outer peripheral surface 10b of the connecting pipe 10 and 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 Nine wedge-shaped projections 91 slide (slide) on the outer peripheral surface 10 b of the connecting pipe 10.

  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, as shown in FIG. 17, the seal member 4 is pressed by the outer peripheral surface 10 b of the connecting pipe 10 and the second step portion 23 and by the end surface 23 a (sealing wall 23 a 1 of the seal groove) and the movable member 7. Transforms into

  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 sealing is performed so that 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 is movable. A groove 12 is formed. On the other hand, the connecting pipe 10 passes through the spring 8 and the movable member 7, and the end surface 10 a of the connecting pipe 10 abuts on the support portion 61 of the sleeve 6 and abuts on the support portion 61 of the sleeve 6. When the end surface 10a reaches the end surface 24b of the joint body 2, the insertion of the connecting pipe 10 is completed.

  Next, the push wheel 3 is screwed (screwed) into the joint body 2 to complete the construction. As shown in FIG. 18, when the screw groove 3 a 1 of the pusher wheel 3 is screwed into the screw groove 22 e of the joint body 2, the retaining member 9 moves in the radial direction of the connecting pipe 10 along the tapered surface 32 of the pusher wheel 3. The wedge-shaped protrusion 91 of the retaining member 9 bites into the outer peripheral surface 10 b of the connecting pipe 10. At this time, the holding member 5 is pushed by the pusher wheel 3 and moves in the insertion direction of the connecting pipe 10. Then, the coil spring 8 is compressed to the end between the holding member 5 and the movable member 7 and further pushed until the movable member 7 contacts the end surface 22c. 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 is compressed by 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, the outer peripheral surface 10 b of the connection pipe 10, and the movable member 7. Connection with the connecting pipe 10 is performed. Further, the pusher wheel 3 is fixed to the joint body 2 by screwing the pusher wheel 3 into the joint body 2, and the connection between the joint body 2 and the connecting pipe 10 is completed.

  Next, as in Example 1, Example 2, and Example 3, leakage detection is performed on the pipe joint 200 into which the connection pipe 10 is inserted in this way. Basically, as shown above, there is no leakage of fluid (water or air) as long as screwing of the pusher wheel 3 into the joint body 2 is completed. Hereinafter, as in Example 1, Example 2, and Example 3, it will be shown how leakage detection is performed when screwing of the pusher wheel 3 into the joint body 2 is not completed.

  In the leak detection, it is confirmed that water or air leaks reliably by applying a pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. Also in this example, as in Examples 1 to 3, a test is performed to confirm that water leaks by applying pressure by flowing water from the direction of arrow A in FIG. 19 to the pipe joint 300 (through hole 21). . However, pressure by water (or air) that is a fluid can be applied from the direction of arrow E shown in parentheses in FIG.

  When water flows from the direction of arrow A in FIG. 19 to the through hole 21 in the joint body 2, the water pressure is applied to the pipe joint 300. Water flows in the connecting pipe 10 in the pipe joint 300 in the direction of the arrow B, and water flows to the third step portion 24 side of the inner peripheral surface in the joint body 2 in the direction of the arrow C to apply pressure. The water that has flowed to the third step portion 24 side flows between the third step portion 24 on the inner peripheral surface in the joint body 2 and the outer peripheral surface 10b of the connection pipe 10 (seal groove 12), and the second step It flows out between the step portion 23 and the outer peripheral surface 10b of the connecting pipe 10 (seal groove 12). Then, a pressure is applied to the seal member 4 in the seal groove 12 so as to move the seal member 4 in the arrow B direction, and the seal member 4 is moved in the arrow B direction along the outer peripheral surface 10 b of the connecting pipe 10.

  As the seal member 4 moves along the outer peripheral surface 10b of the connecting tube 10, the movable member 7 that is in contact with the seal member 4 also moves in the arrow B direction. The coil spring 8 is compressed by the movement of the movable member 7. By continuing the flow of water 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 as shown in FIG. 20, the seal member 4 is pushed out of the seal groove 12, Move to the first step 22. As a result, a gap is formed between the seal groove 12 (in the vicinity of the end face 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 along the arrow D direction. It flows out to one step 22. Thus, water leaks when water flows out to the first step portion 22.

  As described above, when leakage is detected and occurrence of leakage is confirmed, it is confirmed that the pusher wheel 3 is not completely screwed into the joint body 2 in the pipe joint 300.

  As described above, after confirming the leakage of water from between the joint body 2 and the connecting pipe 10 in the pipe joint 300, the presser wheel 3 screwed into the joint body 2 as shown in FIG. Screw. By this screwing, the wedge-shaped projection 91 of the retaining member 9 is locked to the outer peripheral surface 10b of the connecting tube 10, the coil spring 8 and the movable member 7 move, the movable member 7 contacts the seal member 4, and the seal member 4 It is pushed back into the seal groove 12. The seal member 4 is 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 and the outer peripheral surface 10b of the connection pipe 10, and the joint body 2 and the connection pipe The connection with 10 is completed, and the piping work is completed.

(Example 5)
FIG. 21 shows a pipe joint 400 that is Example 5 of the present invention. Example 5 is basically similar to 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 the pusher wheel 3 of Example 5 and Example 1 is that when the pusher wheel 3 is pushed into the joint body 2, the stop ring 11 is used between the pusher wheel 3 and the joint body 2 in Example 1, whereas Example 5 is different. Then, the presser wheel 3 and the joint body 2 are screwed together. In Example 1, the sleeve 6, the movable member 7, the coil spring 8, the holding member 5, and the retaining member 9 are used, whereas in Example 5, these members are not used.

  The joint main body 2 of the pipe joint 400 shown in FIG. 21 has the same shape as that of Example 1, and has a tubular 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. 21, 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. And the O-ring 4 is incorporated in the 2nd step part 23 in the coupling main body 2, as shown in FIG.

  A push ring 3, which is a cylindrical member, is incorporated in 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.

  Next, a process of inserting the connection pipe 10 into the pipe joint 400 having the above configuration will be described with reference to FIG.

  Insertion of the connecting pipe 10 into the pipe joint 400 is the same as in Example 1. When the connecting pipe 10 is inserted into the through hole 21 of the pipe joint 400 from one end 2 a side of the joint body 2, the connecting pipe 10 advances through the through hole 21 so as to face the inner peripheral surface 3 f of the pusher wheel 3. When the connecting pipe 10 advances to the second step portion 23 side, it comes into contact with the seal member 4, and the seal member 4 is pressed by the outer peripheral surface 10b of the connecting pipe 10 and the second step portion 23 and the end face 23a (seal groove 12). 22 is deformed as shown in FIG.

  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. 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, in a state where the connecting pipe 10 is in contact with the seal member 4, the connecting pipe 10 proceeds to the other end 2 b of the joint body 2, and the end face 10 a of the connecting pipe 10 reaches the end face 24 b of the joint body 2. The insertion is also completed.

  Next, the push wheel 3 is screwed into the joint body 2 to complete the construction. As shown in FIG. 23, the thread groove 3a1 of the pusher wheel 3 screwed into the thread groove 22e of the joint body 2 is screwed. By this screwing, the pusher wheel 3 comes into contact with the end face 22c and prevents the seal member 4 from coming out of the seal groove 12. The seal member 4 is 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 and the outer peripheral surface 10b of the connection pipe 10, and the joint body 2 and the connection pipe 10 is connected. In addition, the screw wheel 3 is screwed in until the end surface 22c of the joint main body 2 comes into contact, whereby the connection between the joint main body 2 and the connecting pipe 10 is completed.

  Next, similarly to Example 1, Example 2, Example 3 and Example 4, leakage detection is performed on the pipe joint 400 into which the connection pipe 10 is 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. In the following, as in Example 1, Example 2, Example 3 and Example 4, it will be shown how leakage detection is performed when the pusher wheel 3 is not fixed to the joint body 2.

  In the leak detection, it is confirmed that water or air leaks reliably by applying a pressure by water (or air) to the connecting pipe 10 (through hole 21) from the direction of arrow A in FIG. Also in Example 5, as in Examples 1 to 3, a test is performed to confirm that water leaks by applying pressure by flowing water from the direction of arrow A in FIG. 24 to the pipe joint 400 (through hole 21). . However, pressure by water (or air) as a fluid can be applied from the direction of arrow E shown in parentheses in FIG.

  When water flows from the direction of arrow A in FIG. 24 to the through hole 21 in the joint main body 2, the water pressure is applied to the pipe joint 400. While water flows in the connecting pipe 10 in the pipe joint 400 in the direction of arrow B, water also flows in the direction of the arrow C to the third step portion 24 side of the inner peripheral surface in the joint body 2 to apply pressure (water pressure). . The water that has flowed to the third step portion 24 side flows between the third step portion 24 on the inner peripheral surface in the joint body 2 and the outer peripheral surface 10b of the connection pipe 10 (seal groove 12), and the second step It flows out between the step portion 23 and the outer peripheral surface 10b of the connecting pipe 10 (seal groove 12). Then, a pressure is applied to the seal member 4 in the seal groove 12 so as to move the seal member 4 in the arrow B direction, and the seal member 4 is moved in the arrow B direction along the outer peripheral surface 10 b of the connecting pipe 10.

  As water continues to flow into the seal groove 12, pressure (water pressure) continues to be applied to the seal member 4, and as shown in FIG. 25, the seal member 4 is pushed out of the seal groove 12 and moved to the first step portion 22. To do. As a result, a gap is formed between the seal groove 12 (in the vicinity of the end face 22c) and the seal member 4, and the water that has flowed into the seal groove 12 flows from the gap to the first step portion 22 in the direction of arrow D. Thus, water leaks when water flows out to the first step portion 22.

  As described above, when the leak detection is performed and the occurrence of the leak is confirmed, it is confirmed that the push ring 3 is not fixed to the joint body 2 in the pipe joint 400.

  As described above, after confirming the leakage of water from between the joint main body 2 and the connection pipe 10 in the pipe joint 400, the presser wheel 3 screwed into the joint main body 2 as shown in FIG. Screw. By this screwing, the pusher wheel 3 comes into contact with the seal member 4 and the seal member 4 is pushed back into the seal groove 12. The seal member 4 is 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 and the outer peripheral surface 10b of the connection pipe 10, and the joint body 2 and the connection pipe The connection with 10 is completed, and the piping work is completed.

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 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 structure of the connection completion of a coupling main body and a connection pipe from a cross section, fixing a press ring to the coupling main body in Example 1 of the pipe coupling which is this invention. It is explanatory drawing which shows the condition which presses from a through-hole when performing the leak test in Example 1 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the condition in the leak test 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 structure of the connection completion of a coupling main body and a connection pipe from a cross section, fixing a press ring to the coupling main body in Example 1 of the pipe coupling which is this invention. It is explanatory drawing which shows the condition which presses from a through-hole when performing the leak test in Example 2 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the condition in the leak test in Example 2 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 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 structure of the connection completion of a coupling main body and a connection pipe from a cross section, fixing a press ring to the coupling main body in Example 1 of the pipe coupling which is this invention. It is explanatory drawing which shows the condition which presses from a through-hole when performing the leak test in Example 3 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the condition in the leak test 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 structure of the connection completion of a coupling main body and a connection pipe from a cross section, fixing a press ring to the coupling main body in Example 1 of the pipe coupling which is this invention. It is explanatory drawing which shows the condition which presses from a through-hole when performing the leak test in Example 4 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the condition in the leak test in Example 4 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 5 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 5 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the structure of the connection completion of a coupling main body and a connection pipe from a cross section, fixing a press ring to the coupling main body in Example 1 of the pipe coupling which is this invention. It is explanatory drawing which shows the condition which presses from a through-hole when performing the leak test in Example 5 of the pipe joint which is this invention from a cross section. It is explanatory drawing which shows the condition in the leak test in Example 5 of the pipe joint which is this invention from a cross section. It is principal part sectional drawing of the state after the connection in the conventional connection mechanism. It is sectional drawing which shows the principal part of the connection state of the conventional thin stainless steel pipe and a coupling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 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 part, 2d ... Inclination 2e ... outer peripheral surface, 2g ... outer peripheral surface, 22 ... first step, 22a ... tapered circumferential groove, 22a1 ... tapered surface, 22b ... tapered circumferential groove, 22b1 ... tapered surface 22c ... end face, 22d ... inclined surface (contact surface), 22e ... screw groove, 23 ... second step, 23a ... end face, 23a1 ... flange wall of seal groove, 23b ... annular groove, 24 ... third Stepped portion, 24a ... Inclined surface, 24b ... End, 25 ... Fourth stepped portion 21 ... Through hole 3 ... Push ring, 3a ... Outer peripheral surface, 3a1 ... Screw groove, 3b ... Outer peripheral surface, 3c ... Outer peripheral surface, 3d ... One end of the press ring, 3e ... The other end of the press ring, 3f ... Inner peripheral surface, 31 ... Circumferential groove, 32 ... Taper Surface 33, circumferential groove 34, indicator 35, through hole 4, sealing member, 4 a, inner diameter side, 4 b, outer peripheral surface 5, holding member, 5 a, one end of the holding member, 5 b, of the holding member The other end portion, 5c: a substantially frustoconical tapered surface, 5d: an edge portion, 51 ... a long hole portion, 52 ... a holding portion, 53 ... a 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 10 ... Connection pipe, 10a ... End face, 10b ... Outer peripheral face

Claims (5)

A joint body having a through hole through which a fluid flows, a connecting member inserted into the through hole, a seal member for sealing the joint body, and the joint body are mounted to be movable in the axial direction of the through hole. A pipe fitting comprising:
The joint body includes a seal groove provided so that the seal member is movable along the outer peripheral surface of the connection pipe and along the outer peripheral surface of the connection pipe. . A joint body having a through hole through which a fluid flows, a connecting member inserted into the through hole, a seal member for sealing the joint body, and the joint body are mounted to be movable in the axial direction of the through hole. A pipe fitting comprising:
The joint body is provided with a recess capable of holding the outer peripheral surface of the seal member in a direction along the outer peripheral surface of the connection pipe while the seal member is movable along the outer peripheral surface of the connection pipe. A pipe joint comprising a seal groove provided along the outer peripheral surface of the connection pipe. A joint body having a through hole through which a fluid flows, a connecting member inserted into the through hole, a seal member for sealing the joint body, and the joint body are mounted to be movable in the axial direction of the through hole. A pipe fitting comprising:
The joint body includes a seal groove provided along the outer peripheral surface of the connection pipe so that the seal member can move along the outer peripheral surface of the connection pipe.
A holding member that is movable in the direction of the seal groove and is movable along the outer peripheral surface of the connecting pipe;
A pipe joint comprising: a sleeve formed integrally or separately from the holding member so as to be separable and holding the seal member in the vicinity of the seal groove.   The pipe joint according to any one of claims 1 to 3, 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 3, wherein the push ring is attached to the joint body by screwing.

Images