JP4887168B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint used for connecting a pipe such as a stainless steel pipe for water supply or hot water supply with one touch.

  As this kind of one-touch type pipe joint, for example, as shown in FIG. 12, an O-ring 31 is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base body (joint body) 30 to A coil spring 32 and an inner collar 34 made of a synthetic resin into which a pressing member 33 having a right-angled edge 33a is fitted are arranged at the edge of the inner surface, and these are covered with a tapered outer collar (push wheel) 35. There is a thing (refer patent document 1). According to this pipe joint, when the connection pipe 36 is inserted from the front end of the inner collar 34, the pressing member 33 is pressed toward the front end side of the inner collar 34, but the outer surface of the pressing member 33 is the tapered surface of the outer collar 35. The connection between the pipe joint and the connection pipe 36 is maintained by the right-angled edge 33a on the inner surface biting into the connection pipe 36 by being pressed by 35a. When a pulling force is applied to the connecting pipe 36 in this coupled state, the pressing member 33 is pressed against the tapered surface 35a side of the outer collar 35 by the elastic force of the coil spring 32, and the right-angled edge 33a of the pressing member 33 by the tapered surface 35a. When the connection pipe 36 is pressed, the connection pipe 36 is prevented from being pulled out.

JP-A-10-122460 (FIGS. 1 to 7)

  However, in the above-described conventional pipe joint, it is not possible to easily confirm whether or not the connection pipe has been inserted to a normal length after the connection pipe 36 is inserted into the joint body 30. become. For this purpose, in general, before inserting the connecting pipe 36 into the joint body 30, the operator marks the connecting pipe 36 with the insertion allowance with magic ink or the like, and after insertion, inserts the insertion allowance to the marking position. Although the method of confirming is adopted, the work of marking the insertion allowance on the connection pipe 36 at the site is extremely troublesome. There is also a problem that the operator forgets to mark.

  The present invention has been made to solve such problems, and the object of the present invention is that it can be connected in a seal-like and retaining shape by a so-called one-touch operation by simply inserting a connecting pipe, It is an object of the present invention to provide a pipe joint that eliminates the marking work of the insertion allowance to the connecting pipe, can easily confirm the state after the connecting pipe is inserted, and has excellent workability and reliability. Another object of the present invention is to provide a pipe joint that can reduce the number of members to be assembled into the joint body and the number of man-hours.

  In order to achieve the above object, the pipe joint of the present invention has a receiving part for receiving the end of the connecting pipe at least at one end as described in claim 1, and a circle near the receiving part. In a joint main body provided with a confirmation hole in at least one place on the periphery in an inner and outer through shape, a retaining member that is engaged with the outer peripheral surface of the connection pipe in order from the receiving portion toward the inner depth of the joint main body, An elastic member that abuts and engages the rear end portion with the retaining member side and presses and urges the retaining member toward the inner periphery of the receiving portion, and is disposed at an inner position of the confirmation hole. An annular display / movable spacer that engages with the tip, a spacer positioning member that positions and holds the display / movable spacer at the inner position of the confirmation hole, and a seal ring that closely contacts the outer peripheral surface of the connection pipe are accommodated. And by the contact of the retaining member with the inner periphery of the receiving portion. A taper surface that applies a radially inward moving action to the retaining member is formed in a constricted shape toward the outside of the receiving portion, and the spacer positioning member is connected to the connecting tube as the connecting tube is inserted. The display / movable spacer moves from the inner position of the confirmation hole to the inner side of the joint body and retreats as the spacer positioning member is pushed. It has the characteristics in being.

  According to such a configuration, the display / movable spacer can be seen from the confirmation hole before the connection pipe is inserted into the joint body. Then, as the connecting pipe is inserted into the joint body, the spacer positioning member is pushed into the inner side of the joint body with respect to the seal ring at the end of the connecting pipe. Move to the inner side of the joint body from the inner position of the confirmation hole by force and retract. The retraction of the display / movable spacer from the confirmation hole makes it possible to confirm that the display / movable spacer is not visible from the confirmation hole, thereby confirming that the connection pipe has been inserted. This can be prevented, and the marking work for inserting into the connecting pipe can be omitted.

  Since the confirmation hole is provided at a position closer to the receiving part than the seal ring, when the connection pipe is inserted to the insertion completion position, the seal ring is compressed in close contact with the outer peripheral surface of the connection pipe. A seal hole is securely sealed between the surface and the inner peripheral surface of the joint body, and water or other fluid flowing in the connection pipe passes from the end of the connection pipe between the outer periphery of the connection pipe and the inner periphery of the joint body. Seal hermetically to prevent leakage. That is, one seal ring seals both the outer peripheral surface of the end portion of the connecting pipe and the inner peripheral surface of the joint body and the confirmation hole, thereby preventing leakage of internal fluid.

  When the connecting pipe is completely inserted, the retaining member is pressed against the tapered surface of the receiving portion by the elastic member, and the retaining member is reduced in diameter by the tapered surface and engaged with the outer peripheral surface of the connecting tube. The connection pipe can be kept from being pulled out.

  When a pulling force is applied to the connecting pipe after the connecting pipe is inserted, the retaining member that accompanies the connecting pipe comes into contact with the tapered surface of the receiving portion, so that the retaining member moves inward in the radial direction. Engagement force on the outer peripheral surface increases. This reliably prevents the connecting pipe from coming out.

  In the pipe joint according to a first aspect, as described in the second aspect, the spacer positioning member can be formed in a sleeve shape that can be fitted onto an end of the connection pipe. In this case, as described in claim 3, the spacer positioning member includes a seal ring holding cylinder portion having an inner diameter substantially the same as the inner diameter of the connection pipe, and a rear end side of the seal ring holding cylinder portion. And a connecting tube end receiving tube portion that is formed to have an inner diameter larger than the outer diameter of the connecting tube and can be fitted over the end of the connecting tube. According to this, when cutting the connecting pipe, even if some burr is generated on the cut end face, even if neglected to remove it, the connecting pipe is sealed with a burr or the like at the end of the connecting pipe. Can be constructed without damaging the ring. Therefore, there is no restriction on the method of cutting the connecting pipe, and the degree of freedom of the cutting work can be obtained.

  In the pipe joint according to claim 3, as described in claim 4, a concave groove into which the inner diameter portion of the seal ring in a free state is fitted can be formed on the outer periphery of the seal ring holding cylinder portion. According to this, the internal stress is not generated in the seal ring before inserting the connection pipe, that is, in stock and storage, and the seal ring is elastically expanded only when the connection pipe is inserted and Since it adheres closely to the outer periphery, an appropriate compression allowance is maintained over a long period of time, and a predetermined service life can be guaranteed. In addition, before inserting the connecting pipe, the spacer positioning member is held in a temporarily fixed state at that position by fitting the concave groove to the inner diameter portion of the seal ring, so the display / movable spacer is The function of locating and maintaining the inner position can be exhibited.

  The pipe joint according to any one of claims 1 to 3, as described in claim 4, has a return preventing elasticity that projects outward in the radial direction due to its elasticity at the rear end side of the display / movable spacer. A claw is provided, and a recess is formed on the inner periphery of the joint body behind the confirmation hole of the joint body to which the return preventing elastic claw engages when the display / movable spacer retreats from the inner position of the confirmation hole. Can be provided. According to this, it is possible to prevent the display / movable spacer from being pushed back to the inner position of the confirmation hole by moving the seal ring toward the receiving portion with internal pressure after the connection pipe is inserted. Therefore, after insertion of the connecting pipe, it is possible to prevent erroneous recognition of the incomplete insertion of the connecting pipe due to the display / movable spacer being pushed back and visible from the confirmation hole.

  According to the pipe joint of the present invention, it can be connected in a seal-like and retaining shape by a so-called one-touch operation by simply inserting the connecting pipe, and the marking operation for inserting the connecting pipe into the connecting pipe is omitted, and the state after the connecting pipe is inserted. Can be easily confirmed by the human eye and is excellent in workability and reliability. In addition, a single seal ring combines the sealing seal between the outer peripheral surface of the end of the connecting pipe and the inner peripheral surface of the joint body and the sealing seal of the confirmation hole. There is an advantage that it can be reduced.

  FIG. 1 is a perspective view of a pipe joint showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the pipe joint after the insertion of the connection pipe is completed, and FIG. 3 is a view before the connection pipe is inserted. FIG. 4 is a partially cutaway sectional view of the pipe joint showing a state in the middle of insertion of the connection pipe, and FIG. 5 is a same pipe showing a state in the middle of further insertion of the connection pipe. FIG. 6 is a perspective view of the display and movable spacer of the pipe joint, FIG. 7A is a perspective view of the spacer positioning member of the pipe joint, and FIG. 7B is the spacer positioning member. FIG. 8 is a plan view of the collar of the pipe joint, FIG. 9 is a front view of the collar, and FIG. 10 is a sectional view of the collar.

  As shown in FIGS. 1 to 3, the pipe joint 1 includes a joint body 2 having a cylindrical shape with both ends opened, a retaining member 3 accommodated and disposed inside the joint body 2, an elastic member 4, A display / movable spacer 6, a spacer positioning member 7, a seal ring 5 and the like are provided.

  The joint body 2 is provided with first and second step portions 8a and 8b in the vicinity of the center in the axial direction, the large diameter portion 9 on one side and the other side on the other side of the first and second step portions 8a and 8b. A small-diameter channel 10 is formed, and an opening end portion of the large-diameter portion 9, that is, a receiving portion 12 into which an end portion of the connection pipe 11 is inserted at one end portion in the axial direction of the joint body 2 is formed. A connecting male screw S is formed on the outer periphery. The first step portion 8a and the second step portion 8b are formed side by side so that the first step portion 8a is located deeper in the joint body than the second step portion 8b, and the first step portion The second step portion 8a is formed larger in diameter than 8a. On the inner periphery of the receiving portion 12, a tapered surface 13 that is narrowed toward the outside of the receiving portion, and a circumferential groove 14 is formed on the outer end of the receiving portion of the tapered surface 13. A confirmation hole 18 is provided in an inner and outer penetrating manner in at least one place on the circumference closer to the receiving portion 12 than the second step portion 8b of the joint body 2.

  Inside the receiving portion 12, a retaining member 3 inscribed in the tapered surface 13, a collar 15 that holds the retaining member 3, and an elastic member that presses and urges the retaining member 3 together with the collar 15 toward the tapered surface 13. 4 are arranged. A retaining ring 16 is fitted into the circumferential groove 14 of the joint body 2 to prevent the collar 15 from coming out of the receiving portion at the inner diameter portion thereof.

  The elastic member 4 is formed of a compression coil spring or the like, and the front end portion of the elastic member 4 is engaged with the step portion 6a of the annular display / movable spacer 6 having an L-shaped cross section. The rear end stepped portion 15a is abuttingly engaged.

  The display / movable spacer 6 is positioned and held by the spacer positioning member 7 so as to be positioned inside the confirmation hole 18 as shown in FIG. As shown in FIGS. 3 and 6, the display / movable spacer 6 is provided with a return-preventing elastic claw 6b protruding outward in the radial direction by elasticity on the rear end side thereof, while the joint body 2 is confirmed as shown in FIG. A recess 17 is provided in the inner periphery of the joint body behind the hole 18 to prevent the display / movable spacer 6 from returning from the inner position of the confirmation hole 18 to the interior of the joint body as shown in FIG. The elastic claw 6 b protrudes radially outward by elasticity and engages with the recess 17, and this engagement prevents the display / movable spacer 6 from returning to the inner position of the confirmation hole 18. The display / movable spacer 6 is preferably colored in a conspicuous color, such as red or blue, for easier confirmation from the confirmation hole 18.

  In addition to the original function of positioning and holding the display / movable spacer 6 so as to be positioned inside the confirmation hole 18 before the connection pipe 11 is inserted, the spacer positioning member 7 has a variability at the cut end of the connection pipe 11. Even if this occurs, it also has a damage prevention function for preventing the seal ring 5 from being damaged at the end. Therefore, the spacer positioning member 7 is formed in a sleeve shape that can be fitted around the end of the connection pipe 11. More specifically, as shown in FIGS. 3, 7A and 7B, the spacer positioning member 7 has a seal ring holding cylinder portion whose inner diameter is substantially the same as the inner diameter of the connection pipe 11. 7a and a connecting pipe that is integrally formed continuously on the rear end side of the seal ring holding cylinder portion 7a and whose inner diameter is larger than the outer diameter of the connecting pipe 11 and can be fitted over the end of the connecting pipe 11. It is formed in a sleeve shape having an end receiving cylinder portion 7b. Between the inner peripheral surface of the seal ring holding cylinder portion 7a and the inner peripheral surface of the connection pipe end receiving cylinder portion 7b, a step portion 23 is formed in which the end surface of the end portion of the connection pipe 11 can abut and engage. ing. On the outer periphery of the seal ring holding cylinder portion 7a, a concave groove 24 into which the inner diameter portion of the seal ring 5 in a free state is fitted is formed.

  As shown in FIGS. 3 and 8 to 10, the collar 15 has a plurality of holding holes 15 b at predetermined intervals in the circumferential direction, and the retaining member 3 is fitted into each holding hole 15 b. In order to prevent the retaining member 3 from detaching from the holding hole 15b to the inside of the collar 15, in the illustrated example, the retaining member 3 is provided with ribs 3b. A protrusion or the like (not shown) may be provided. A plurality (two in the illustrated example) of engaging teeth 3 a are formed on the inner surface side of each retaining member 3.

  Each said member which comprises the pipe joint 1 can be formed with the following material, for example. Since the joint main body 2 requires corrosion resistance and rigidity, it can be manufactured by a precision casting method or the like using, for example, an SCS material or a bronze material. The seal ring 5 can be formed of an O-ring made of an olefin rubber, and is particularly formed of EPDM, which is a terpolymer of ethylene, propylene, and a diene monomer for crosslinking, excellent in chlorine resistance and heat resistance. Further, it can be formed of FKM (fluoro rubber) having excellent heat resistance and chemical resistance. The spacer positioning member (scratch prevention sleeve) 7 can be formed of PP or PE. The display / movable spacer 6 and the collar 15 can be formed of general-purpose engineering plastics such as cross-linked polyethylene, or special engineering plastics such as PPE (polyphenylene ether) or PPS (polyphenylene sulfide) having excellent heat resistance. When a compression coil spring is used as the elastic member 4, this member can be formed of austenitic stainless steel (SUS304), and the retaining ring 16 can also be formed of the same material. The retaining member 3 may be formed of a material harder than the connecting pipe 11, for example, martensitic stainless steel (SUS420) when the connecting pipe 11 is austenitic stainless steel (SUS304).

  The construction procedure of the connecting pipe 11 by the pipe joint 1 will be described with reference to FIGS.

  As shown in FIG. 3, in the joint main body 2, the retaining member 3, the elastic member 4, the display / movable spacer 6, and the spacer positioning are sequentially arranged from the receiving port 12 toward the inner part of the joint main body 2. All parts such as the member 7 and the seal ring 5 are incorporated. At that time, the seal ring 5 is disposed on the second step portion 8 b in the joint body 2, and the inner diameter portion of the seal ring 5 is disposed so as to fit into the concave groove 24 of the spacer positioning member 7 in a free state. The display / movable spacer 6 is disposed between the distal end portion of the elastic member 4 and the connecting tube end receiving cylindrical portion 7b of the spacer positioning member 7 so as to be positioned inside the confirmation hole 18 and from the confirmation hole 18. Arrange it so that it can be seen. Since the spacer positioning member 7 is held in a temporarily fixed state at the corresponding position by fitting the concave groove 24 to the inner diameter portion of the seal ring 5, the function of positioning and holding the display / movable spacer 6 at the predetermined position is exhibited. . In such an assembled state, the pipe joint 1 is stocked and stored.

Thereafter, as shown in FIG. 4, the connection pipe 11 is inserted into the receiving portion 12 of the joint body 2 and the end thereof enters the connection pipe end receiving tube portion 7 b of the spacer positioning member 7 at the site construction. When inserted until it contacts the step portion 23, the retaining member 3 is pressed against the tapered surface 13 by the elastic force of the elastic body 4, and moves inward in the radial direction within the holding hole 15b of the collar 15, thereby engaging the teeth. 3a is strongly engaged with the outer peripheral surface of the connecting pipe 11. Therefore, even if an external force is applied in the direction in which the connecting pipe 11 is pulled out at this time, the connecting pipe 11 does not come out.
In addition, the spacer positioning member 7 is interposed between the seal ring 5 and the end of the connection pipe 11, that is, the end of the connection pipe 11 is not in contact with the seal ring 5. Even if burrs are formed on the end face of the seal ring, the seal ring 5 is not damaged by the burrs, and fluid leakage due to damage to the seal ring 5 can be prevented.

  When the connecting pipe 11 is inserted deeply from the insertion intermediate state of FIG. 4 through the insertion intermediate process of FIG. 5, a seal connection state between the joint body 2 and the connecting pipe 11 is obtained as shown in FIG. That is, as shown in FIG. 5, when the connecting pipe 11 is inserted partway into the joint body 2, the connecting pipe 11 is in a state where the engaging teeth 3 a of the retaining member 3 are engaged with the outer peripheral surface of the connecting pipe 11. 2, the spacer positioning member 7 is pushed in, and the display / movable spacer 6 is coupled with the elastic restoring force of the elastic member 4 from the inside of the confirmation hole 18 along with the pushing. Move in the direction and retreat. Thus, it can be confirmed that the display / movable spacer 6 disappears from the confirmation hole 18 by retreating the display / movable spacer 6 from the confirmation hole 18, thereby confirming that the connecting pipe 11 has been inserted.

  As shown in FIG. 5, when the display / movable spacer 6 is retracted from the confirmation hole 18, the return preventing elastic claw 6 b of the display / movable spacer 6 protrudes outward in the radial direction due to its elasticity and is more than the confirmation hole 18 of the joint body 2. It engages with a recess 17 provided on the inner periphery of the inner side of the joint body. When the display / movable spacer 6 is engaged with the recess 17 as described above, as the seal ring 5 moves toward the receiving portion 12 by internal pressure as shown in FIG. It is possible to prevent the occurrence of a trouble that the display / movable spacer 6 is pushed back to the position inside the confirmation hole 18. Therefore, it is possible to prevent erroneous recognition of the incomplete insertion of the connection pipe 11 due to the display / movable spacer 6 being pushed back and visible from the confirmation hole 18 after the connection pipe 11 is inserted.

  Finally, as shown in FIG. 2, when the connecting pipe 11 is inserted to the insertion completion position where the seal ring holding cylinder portion 7a of the spacer positioning member 7 reaches the first step portion 8a in the joint body 2, A state is obtained in which the ring 5 is in close contact with the outer peripheral surface of the connection pipe 11 in a compressed manner to securely seal and seal between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2. Is obtained, and a reliable retaining state in which the engaging teeth 3a of the retaining member 3 are engaged with the outer peripheral surface of the connecting tube 11 is obtained.

  The insertion completion state of the connection pipe 11 can be confirmed by confirming that the display / movable spacer 6 disappears from the confirmation hole 18 and cannot be seen. Therefore, it is possible to prevent the internal fluid from leaking due to insufficient insertion of the connecting pipe 11.

  After the connection pipe 11 is completely inserted, when the connection pipe 11 is pulled in the pulling-out direction, the retaining member 3 that accompanies the connecting pipe 11 abuts against the constricted side of the tapered surface 13 so that the retaining member 3 is radially inward. The engagement teeth 3a increase the biting engagement force to the outer peripheral surface of the connection tube 11 by moving to the position. This reliably prevents the connection pipe 11 from coming out.

  The spacer positioning member 7 having the connecting pipe end receiving tube portion 7b further has the following advantages. That is, when the insertion length of the connecting pipe 11 is insufficient, the connecting pipe end receiving tube portion 7b of the spacer positioning member 7 is interposed between the connecting pipe 11 and the seal ring 5 as shown in FIG. Since the tube 11 is in a non-contact state with the seal ring 5, a receiving portion is formed along the outer peripheral surface of the connecting tube 11 from the gap between the inner peripheral surface of the spacer positioning member 7 and the outer peripheral surface of the connecting tube 11 in the hydraulic pressure test. A minute water leak in the direction of 12 can be detected. Insufficient insertion of the connecting pipe 11 can be confirmed by this water leak detection.

  In addition, after connecting the connection pipe 11, in order to artificially remove the connection pipe 11 from the pipe joint 1, a screwdriver or the like is inserted from the receiving portion 12 and the collar 15 together with the retaining member 3 is moved inwardly of the joint body 2. By pushing against the elastic force of the elastic member 4, the tightening force due to contact with the tapered surface 13 of the retaining member 3 is released, and the connecting pipe 11 can be pulled out from the joint body 2.

  As shown in FIG. 3, the inner diameter of the seal ring 5 in the free state is inserted into the groove 24 formed in the outer periphery of the seal ring holding cylinder portion 7a of the spacer positioning member 7 before inserting the connecting pipe 11, that is, in stock and storage. The part is fitted. If this is done, the inner diameter portion of the seal ring 5 is elastically deformed (expanded) when the inner diameter portion of the seal ring 5 is fitted to the outer periphery of the seal ring holding cylinder portion 7a without providing the concave groove 24. If left in this state for a long period of time, a so-called “sagging phenomenon” occurs in the seal ring 5 and a permanent compression strain remains. Even if the load is removed, the inner diameter does not return to the original dimension, and the service life of the seal ring 5 is reduced. As shown in FIG. 3, in the mounted state in which the inner diameter portion of the seal ring 5 in the free state is fitted into the concave groove 24 formed on the outer periphery of the seal ring holding cylinder portion 7a as shown in FIG. The seal ring 5 is elastically expanded only when the connecting pipe 11 is inserted and is in close contact with the outer periphery of the connecting pipe 11, so that an appropriate compression allowance is maintained over a long period of time and a predetermined durability The number of years can be guaranteed.

In the above-described embodiment, the display / movable spacer 6 and the spacer positioning member 7 are formed separately. It may be formed integrally. In this case, the connecting portion is torn off by the force of inserting the connecting tube 11 just before the insertion of the connecting tube 11, and the spacer positioning member 7 is separated from the display / movable spacer 6.
Moreover, in the said Example, although the receptacle part 12 was formed in the one end of the coupling main body 2, and the external thread adapter S was formed in the outer periphery of the other end, it described, but this invention is not limited to this, Needless to say, the present invention can also be applied to structures such as symmetrical socket-type pipe joints having elbows at both ends, elbow-type pipe joints, and the like. Further, the connecting pipe 11 is not limited to a metal pipe such as a stainless steel pipe, and can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

It is a perspective view of the pipe joint of one example of the present invention. FIG. 5 is a half-broken cross-sectional view of the pipe joint showing a state after the connection pipe is completely inserted. FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state before the connection pipe is inserted. FIG. 6 is a half-broken cross-sectional view of the pipe joint showing a state during the insertion of the connecting pipe. It is a half cut-out cross-sectional view of the pipe joint showing a state in which the connecting pipe is further inserted. It is a perspective view of the display and movable spacer of the pipe joint. (A) is a perspective view of the spacer positioning member of the pipe joint, and (b) is a partially enlarged sectional view of the spacer positioning member. It is a top view of the color of the pipe joint. It is a front view of the same color. It is sectional drawing of the same color. FIG. 3 is a half-broken cross-sectional view of a pipe joint showing a troubled state corresponding to FIG. 2. It is a half notched cross-sectional view of a conventional pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Detachment member 4 Elastic member 5 Seal ring 6 Display / movable spacer 7 Spacer positioning member 7a Seal ring holding | maintenance cylinder part 7b Connection pipe end receiving cylinder part 11 Connection pipe 12 Receiving part 13 Tapered surface 18 Confirmation Hole 24 groove

Claims (5)

In the joint main body having a receiving portion for receiving the end of the connecting pipe at least at one end, and having a confirmation hole formed in the inner and outer through-holes in at least one place on the circumference near the receiving portion, the receiving port In order from the inner part to the inner part of the joint body, a retaining member that is engaged with the outer peripheral surface of the connection pipe, and a rear end portion is brought into contact with and engaged with the retaining member side so that the retaining member is placed inside the receiving part. An elastic member that presses and urges toward the periphery, an annular display / movable spacer that is disposed at an inner position of the confirmation hole and engages with a tip portion of the elastic member, and the display / movable spacer is attached to the confirmation hole. It contains a spacer positioning member that is positioned and held at the inner position, and a seal ring that is in close contact with the outer peripheral surface of the connecting pipe,
On the inner periphery of the receiving part, a tapered surface that applies a moving action radially inward to the retaining member by contact of the retaining member is formed in a constricted shape toward the outer side of the receiving part,
The spacer positioning member is pushed into the joint body at the end of the connecting pipe as the connecting pipe is inserted, and the display / movable spacer is located inside the confirmation hole as the spacer positioning member is pushed. A pipe joint, wherein the pipe joint is configured to move from the position to the inner side of the joint body and retract.   The pipe joint according to claim 1, wherein the spacer positioning member is formed in a sleeve shape that can be fitted onto an end of the connection pipe.   The spacer positioning member is integrally connected to a seal ring holding cylinder part having an inner diameter substantially the same as the inner diameter of the connection pipe, and a rear end side of the seal ring holding cylinder part, and the inner diameter is the connection pipe. The pipe joint according to claim 2, wherein the pipe joint is formed in a shape having a connecting pipe end receiving tube portion that is formed larger than the outer diameter of the connecting pipe and can be fitted onto the end portion of the connecting pipe.   The pipe joint according to claim 3, wherein a concave groove into which an inner diameter portion of the seal ring in a free state is fitted is formed on an outer periphery of the seal ring holding cylinder portion. On the rear end side of the display / movable spacer, there is provided a return prevention elastic claw that projects outward in the radial direction due to its elasticity, and the display / moving spacer is arranged on the inner periphery of the joint body behind the confirmation hole. The pipe joint according to any one of claims 1 to 4, wherein a concave portion with which the return-preventing elastic claw is engaged as the movable spacer retracts from the inner position of the confirmation hole is provided.

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