JP5032527B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting pipes.

  Conventionally, the pipe joint 40 as shown in FIG. 9 is known (for example, refer patent document 1). That is, the retaining ring 42 that bites into the outer peripheral surface of the tip 41 of the pipe P is stored in the ring storage space 44 having the tapered inner peripheral surface 43, and the pipe P is pulled out from the pipe joint 40 in the direction of arrow R. Accordingly, the retaining ring 42 moves in the same direction (in the direction of arrow R), and the retaining ring 42 radially contracts radially outward at the outer diameter-reduced tapered inner peripheral surface 43, and the tip of the pipe P It has a structure that bites into the outer peripheral surface of 41 and prevents pull-out.

Japanese Utility Model Publication No. 4-42985

In this conventional pipe joint, in principle, the pipe P should be prevented from being pulled out by operating as described above.
However, in the actual pipe connection, even if the pipe P starts to move in the direction of the arrow R, the retaining ring 42 does not move in the direction of the arrow R at the same time. In some cases, the pipe P was completely removed while the diameter was insufficient.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pipe joint that can immediately and reliably prevent the pipe from being pulled out as soon as the pipe starts to be pulled out.

Therefore, the present invention includes a joint body having an intubation portion to be inserted at the tip of a pipe, and an outer cylinder body that surrounds the inner intubation portion from the outer diameter side to form a tip opening cylindrical storage space portion. In the pipe joint provided, the outer cylindrical body has a tapered inner peripheral surface that is reduced in diameter toward the distal end opening side, and is fitted on the distal end of a pipe inserted into the storage space. A retaining ring with a biting claw that is housed in the storage space and contracts in diameter while sliding on the tapered inner peripheral surface as the pipe moves in the pulling direction, and the retaining ring is always elastically moved toward the tip opening side. A preload spring for energizing, and between the preload spring and the retaining ring, an axially orthogonal annular plate portion, and a radially inward from an inner peripheral edge of the annular plate portion, and A thin plate-like spring support having an inclined plate portion bent in the axial inward direction. The inclined plate portion of the spring receiving ring has a large number of locking teeth, is always in contact with the tip of the inserted pipe, and bites in as the pipe moves in the drawing direction. Configured.

Also, the retaining ring has a notch formed condensation径助length slit from inside and outside the opposite direction alternately and in axial direction.

Moreover, the outer periphery sealing material which contacts the outer peripheral surface of the said inserted pipe is provided in the back | inner position of the said storage space part.
In addition, a sealing material that contacts the inner peripheral surface of the tip of the inserted pipe is provided in the inner intubation portion, and is disposed in an outer fitting shape on the inner intubation portion, and at the tip of the pipe to be inserted. An annular guide ring is provided that guides and guides the tip of the pipe while being pressed and slid along the intubation portion to elastically reduce the diameter of the sealing material.

The present invention has the following remarkable effects.
The retaining ring receives the elastic urging force of the preload spring, and always presses lightly against the tapered inner peripheral surface, and the biting claw always touches the pipe tip lightly and is held in a reduced diameter standby state.
That is, the claw of the retaining ring at the initial tip (outer peripheral surface) of the pipe is immediately started to prevent the pipe from slipping off.

It is sectional drawing which shows one Embodiment of this invention. It is a principal part expanded sectional view. It is a perspective view which shows an example of a retaining ring. It is a perspective view which shows an example of a spring receiving ring. It is sectional drawing which shows an example of a guide ring. It is principal part sectional drawing which shows other embodiment of this invention. It is principal part sectional drawing which shows other embodiment of this invention. It is principal part sectional drawing which shows another embodiment of this invention. It is principal part sectional drawing which shows a prior art example.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
1 to 4 show an embodiment of the present invention. In FIG. 1, the left half shows a pipe not inserted state, the right half shows a pipe inserted state, and FIG. 2 is an enlarged view of a main part showing a pipe not inserted state.

  The pipe joint according to the present invention includes a joint main body 1 and two outer cylindrical bodies 2 and 2, and the joint main body 1 is inserted into the inner peripheral surface of the distal end 3 of the pipe P. 4, the outer cylinder 2 is attached (screwed) to the joint body 1 with the inner tube 4 of the joint body 1 surrounded from the outer diameter side (with a predetermined interval in the radial direction). A tip opening cylindrical storage space 5 in which the tip 3 of the pipe P is stored is formed.

  In FIG. 1, a socket type is illustrated, the joint body 1 has a through hole 6 along the uniaxial center L, and the inner intubation parts 4, 4 extend from the central annular wall part 7 to the left and right. It is connected to. The central annular wall portion 7 has a so-called outer casing-like shape and is formed so as to project in a convex shape in cross section, and has a low protrusion 7A having a large width dimension in the axis L direction and a high protrusion having a smaller width dimension. 7B, and a male thread portion 10 is formed on the low protrusion 7A. A female screw portion 11 is formed on the inner peripheral surface of the base end portion 12 of the outer cylindrical body 2, and a base end of the outer cylindrical body 2 is formed by a screw coupling N composed of the female screw portion 11 and the male screw portion 10. The part 12 and the joint main body 1 are screwed and assembled.

In this way, between the inner peripheral surface of the outer cylinder 2 assembled by surrounding the inner intubation portion 4 from the outer diameter side and the outer peripheral surface 13 of the inner intubation portion 4 of the joint body 1, the pipe P A space 5 for accommodating the tip 3 is formed in a cylindrical shape with a tip opening.
And the outer cylinder 2 has the taper-shaped inner peripheral surface 14 diameter-reduced to the front end opening side. Specifically, the outer cylindrical body 2 has a (straight) cylindrical wall portion 15 having substantially the same inner diameter, a female screw portion 11 is provided on the inner peripheral surface of the base end, and from the cylindrical wall portion 15, A tapered wall portion 17 with a reduced diameter is continuously provided at the tip, and the tapered inner peripheral surface 14 is formed on the inner periphery thereof. However, as shown in FIG. 1, it is also preferable to form a tapered surface on the outer peripheral surface sufficiently long (in the direction of the axis L) to such an extent that the boundary between the cylindrical wall portion 15 and the tapered wall portion 17 becomes unclear. Further, a small inner collar 18 that is bent in the inner diameter direction at the tip of the tapered wall portion 17 is formed. Further, two outer circumferential concave grooves are formed inwardly from the outer peripheral surface 13 of the inner intubation section 4 so that the sealing materials 29, 29 such as an O-ring contacting the inner peripheral surface of the tip 3 of the pipe P are fitted. It is arranged in a shape.

  Reference numeral 20 denotes a retaining ring having a plurality of biting claws 21, 21, 21 on the inner peripheral surface side (see FIGS. 1, 2, and 3), and the pipe P to be inserted into the storage space 5. It is built in the storage space 5 so as to be fitted on the outer peripheral surface of the tip 3 and is moved (in particular, at a position corresponding to the tapered inner peripheral surface 14) in the pulling direction of the pipe P (see arrow Z). Along with this, the diameter is reduced while being in sliding contact with the tapered inner peripheral surface 14, and the biting claws 21, 21, and 21 bite into the outer peripheral surface of the pipe P to prevent the pipe P from coming off (stopping off).

  In addition, a preload spring 22 such as a coil spring that constantly urges and urges the retaining ring 20 toward the tip opening side is incorporated in the space portion 5. More specifically, reference numeral 23 denotes a thin plate spring receiving ring (see FIG. 4), which is interposed between the front end surface of the preload spring 22 and the base end surface 20A of the retaining ring 20. Moreover, as shown in FIG. 4, FIG. 1 and FIG. 2, the spring bearing ring 23 has a circular plate portion 23A orthogonal to the axis L and a radial from the inner peripheral edge of the circular plate portion 23A. And an inclined plate portion 23B that is bent inward and in an axial inward direction, and the inclination angle is preferably 10 ° to 40 ° with respect to the axis L. Further, the inclined plate portion 23B of the spring receiving ring 23 has a large number of locking teeth 24 as shown in FIG. 4, and always contacts the tip 3 of the inserted pipe P as shown in FIG. It is configured to bite in as the P moves in the drawing direction (in the direction of arrow Z).

  In addition, the inclined plate portion 23B directed radially inward and axially inward with an inclination angle of 10 ° to 40 ° with respect to the axis L has another function (action) as follows. That is, when the pipe P is inserted into the space portion 5, the inclined plate portion 23B has been inserted when the coil spring (preload spring) 22 is displaced so as to be eccentric with respect to the axis L. The coil P (preload spring) 22 is centered in contact with the leading edge of the pipe P, and the guide function (action) for the pipe P to be smoothly inserted is exhibited.

  Next, a specific example of the retaining ring 20 is shown in FIG. 3, but it is desirable to form the slits 26, 27 for promoting diameter reduction in the axial direction and alternately from the inner and outer opposite directions. . That is, when the pulling force is applied to the pipe in the direction of the arrow Z from the pipe insertion state on the left side of FIG. 1 to the pipe insertion state on the right side of FIG. There is an advantage that the diameter reduction / expansion becomes smooth.

Next, reference numeral 28 denotes a closed annular guide ring that guides and guides the tip of the pipe P (at the time of insertion) without damaging the sealing materials 29 and 29 such as an O-ring.
In FIG. 5, the inner surface of the guide wheel 28 has a cross-sectional shape having a straight portion 28a on the outer side in the axial direction and a tapered portion 28b on the inner side in the axial direction. The straight portion 28a is formed parallel to the axis L, and the straight portion 28a and the tapered portion 28b are connected with a large curvature radius. With this cross-sectional shape, the sealing material 29 can be elastically pressed without damaging it.

  In the pipe insertion state on the right side of FIG. 1, the outer peripheral surface of the inner tube 4 is a smooth circumferential surface over a sufficient length E. Thereby, even if the pipe P moves in the direction of the arrow Z, the inner surface of the pipe P maintains a smooth surface, and there is an effect that the sealing materials 29 and 29 are not damaged.

  By the way, the material of the parts will be described. The joint body 1 is made of metal or plastic, and the outer cylinder 2 is made of metal or plastic. The retaining ring 20 and the guide ring 28 are also made of metal or plastic. The pipe P is a plastic such as PE or PP, or a composite pipe of these and a metal. The spring receiving ring 23 is made of a thin metal plate such as steel (including stainless steel).

In addition, the pipe joint according to the present invention can be applied to a pipe P having a small diameter to a large diameter having an inner diameter of φ100 mm.
Further, in the above-described embodiment, the case of the socket type has been described, but other than this, an elbow type, a cheese type, an adapter type, or the like can be freely used. Further, as the preload spring 22, a leaf spring piece, a disc spring, and other elastic bodies can be used. The shape of the retaining ring 20 can also be deformed.

  In the uninserted state of the pipe shown in the left half of FIG. 1, the retaining ring 20 abuts against the small inner collar 18 at the open end by the preload spring 22, and the guide ring 28 protects the outer sealing material 29. Although it is in position, once the pipe P is inserted, the retaining ring 20 is temporarily fitted to the proximal end of the intubation section 4 together with the guide ring 28 while slightly moving the spring 22 inwardly. The pipe insertion state shown in the right half of FIG. Even when the preload spring 22 is eccentric when the pipe is inserted, the inclined plate portion 23B of the spring receiving ring 23 is elastically contacted with the tip of the pipe P and is corrected concentrically with the axis L, so that smooth Pipe P is inserted into

Further, when this pipe is inserted, the guide ring 28 comes into contact with the tip 3 of the pipe P to be inserted, is pressed by the tip 3 of the pipe P to be inserted and slides along the intubation portion 4, The leading end of the pipe P is guided and guided while the sealing material 29 is pressed radially inward and elastically reduced in diameter. In other words, it serves as a pilot's pilotage guide.
Here, when a pipe P or a metal pipe P made of a copper double-layer pipe coated with a resin or the like is coated on the outer periphery of a thin copper pipe with a cutting machine such as a pipe cutter, the inside of the end of the pipe P is cut. Sharp protrusions such as burrs are generated at the periphery. If the removal process of the burr portion is insufficient, the sealing materials 29 and 29 may be damaged or cut when the pipe P is inserted. If leakage due to damage occurs at the contact portion of the sealing material 29, leakage to the outside occurs, causing serious damage to the building.
However, the guide wheel 28 contacts the sealing materials 29 and 29 before the pipe P and presses radially inward, so that the sealing material 29 escapes from the traveling path of the burr portion (a passage is ensured). Then, the sealant 29 is allowed to pass without contacting. The seal material 29 is prevented from contacting the burr portion by the guide ring 28. The sealing material 29 contacts the inner peripheral surface of the pipe P after the burr portion passes.

  Under the pipe insertion state shown in the right half of FIG. 1, the retaining ring 20 is pressed against the tapered inner peripheral surface 14 with an appropriate strength by the elastic urging force of the preload spring 22 to reduce the diameter. The biting claws 21, 21, 21 lightly bite the outer peripheral surface of the pipe P lightly. That is, the claws 21, 21, 21 are in a standby state where they can immediately start biting. Moreover, the locking teeth 24 of the inclined plate portion 23B of the spring receiving ring 23 also serve to reinforce the standby state.

In other words, the pipe P can be prevented from slipping out in the direction of the arrow Z. That is, when the pipe P is about to be pulled out in the direction of the arrow Z, the locking teeth 24 bite into the outer peripheral surface of the pipe P by the elastic urging force of the inclined plate portion 23B and immediately move to the retaining ring 20. The taper outer peripheral surface 20B of the retaining ring 20 is pressed against the taper inner peripheral surface 14, and the ring 20 is reduced in diameter as a whole, and the claw 21 bites into the pipe P. I can stop.
Thus, in the illustrated example, the preload spring 22, the inclined plate portion 23B, the retaining ring 20 and the like work together to reliably prevent the initial pulling out of the pipe and prevent the retaining when the pipe P is further pulled in this state. As a result of the ring 20 moving along with the pipe P along the tapered inner peripheral surface 14 and further reducing the diameter of the pipe P, the inner peripheral surface of the pipe P bites into the groove portion of the inner intubation portion 4 and is immediately released with a strong retaining state ( Connection complete state).

Next, FIG. 6 shows another embodiment of the present invention. Housing space portion 5, the rear position, has an annular sub-housing space portion 8 which is recessed to axial inwardly large diameter slightly than the thickness dimension Tp of the pipe P groove width T ₈ .
On the outer diameter side inner peripheral surface 8a of the sub-accommodating space portion 8, a circumferential concave groove that is recessed radially outward is formed. An outer peripheral sealing material 81 such as an O-ring is disposed in the circumferential groove. Further, the inner diameter side inner peripheral surface 8b of the sub storage space portion 8 is also the outer peripheral surface 13 of the inner intubation portion 4 and is a continuous smooth circumferential surface.
As shown in FIG. 7, when the pipe P is inserted, the guide wheel 28 and the vicinity of the end face of the pipe P are inserted into the auxiliary storage space 8. The outer peripheral sealing material 81 disposed in the back position of the storage space 5 is in close contact with the outer peripheral surface near the end surface of the pipe P. In other words, it can be said that the back position of the storage space 5 is a position where the vicinity of the end face (inside the tip 3) of the inserted pipe P is stored. Further, it can be said that the position is closer to the end face of the inserted pipe P (close to the end face) than the positions of the retaining ring 20, the preload spring 22, and the spring receiving ring 23.
The pipe P is sealed on the inner peripheral surface side by the sealing materials 29, 29 and sealed on the outer peripheral surface side by the outer peripheral sealing material 81. That is, the pipe P is double-sealed in a pinched manner from the inside and outside, and water leakage is reliably prevented.

  Further, as in another embodiment shown in FIG. 8, the inner diameter dimension of the preload spring 22 is increased so that the outer peripheral sealing material 81 is axially outward (arrowed) from the axial inner end of the preload spring 22. You may arrange | position in the Z direction side. By comprising in this way, while providing the outer periphery sealing material 81 in the back position, the insertion allowance of the pipe P can be shortened and the full length of a pipe joint can be shortened. In FIG. 8, the spring receiving ring 23 is not shown.

Here, a wide variety of pipe materials exist in the market. For example, brazed joints with acetylene burners for water supply, hot water supply, and heating pipes, etc., instead of the mainstream copper pipes, cross-linked polyethylene pipes, polybutene pipes, and aluminum are bonded from the inside and outside with polyethylene resin. The aluminum reinforced polyethylene pipe (also called aluminum three-layer pipe) with the above structure, and further reducing the cost by reducing the thickness while maintaining the reliability of the conventional copper pipe, and covering the outer peripheral surface with polyethylene resin etc. This is a tube material such as a copper double-layer tube in which a thin copper tube and a resin coating portion on the outer layer side are bonded and strengthened with an adhesive resin or the like.
In particular, the copper double-layer tube is not resin on the inner layer side, so it has excellent heat resistance, is free from environmental hormones, and has no odor derived from organic components eluted from the resin. It is expected to spread in the future as a new pipe material that has been followed and dramatically improved workability in piping construction.

  However, even in such a highly reliable pipe material such as a copper double-layer pipe, there is a possibility that the thin copper pipe on the inner layer side may corrode depending on the quality of water used. In other words, even if there is not a large amount of water leakage to the outside due to the resin coating part on the outer layer side, it will infiltrate between the copper tube and the resin coating part (adhesive layer), and between the copper tube and the resin coating part There was a possibility that it would flow and eventually leak from the end face of the pipe or the pipe edge. Leakage from the end face will ooze out, and will not immediately cause serious problems such as serious damage to the building, but some countermeasures are necessary.

In view of this, the outer peripheral sealing material 81 is provided in anticipation of water leakage from the end face of the pipe P which may occur during long-term use.
In order to verify the operation and effect of the outer peripheral sealing material 81, a copper two-layer tube in which an adhesive resin is bonded between the inner layer side copper tube and the outer layer side resin coating portion is used as a test pipe P, and an outer peripheral sealing material 81 is provided. And a heat and pressure-resistant creep test (evaluation) using a highly corrosive aqueous solution was performed. A 5 wt% sodium chloride aqueous solution was used as the pressure medium, and the test pressure was 0.5 MPa and the environmental temperature was 95 ° C., and the test was performed for a maximum test period of 3 months. The test pipe P has a length of 300 mm, an outer diameter of 16 mm, an inner layer side (thin wall) copper tube thickness of 0.3 mm, and an outer layer side resin coating portion thickness of 1.7 mm. The inner circumferential groove having a groove width of 2 mm that penetrates the copper pipe portion was turned using a lathe cutting machine at the center portion in the longitudinal direction, and the corrosion state of the copper pipe portion was reproduced.

As a result, in the pipe joint not provided with the outer peripheral sealing material 81, the test pipe P was detached after two months. In the pipe joint provided with the outer peripheral sealing material 81, the test pipe P did not come off even after 3 months.
After the test, these pipe joints and test pipes P were vertically divided to verify the state. Then, in all the pipes P, peeling progressed between the inner layer side copper tube and the outer layer side resin coating part due to the above-mentioned adverse conditions, and the peeling reached the end surface of the test pipe P.

That is, in the pipe joint not provided with the outer peripheral sealing material 81, the aqueous solution leaked from the end surface is filled in the storage space 5, the pipe retaining ring 20, the preload spring 22, and the spring receiving ring 23 are corroded, and the original disconnection is caused. It was found that the test pipe P was removed due to the lowering of the stopping function.
In addition, the pipe joint provided with the outer peripheral sealing material 81 has a storage space in the vicinity of the pipe retaining ring 20, the preload spring 22, and the spring receiving ring 23 by the outer peripheral sealing material 81 even if water leaks from the end face. Since the portion 5 is not filled, the sufficient function expected originally was exhibited without being corroded. In other words, the outer peripheral sealing material 81 prevents the aqueous solution leaking from the end surface from coming into contact with the members for retaining the pipes (the pipe retaining ring 20, the preload spring 22, and the spring receiving ring 23).
That is, it has been clarified that the connection can be maintained for a long period of time by the outer peripheral sealing material 81 even in the case of the pipe P such as a copper double layer pipe.

  As described above, the present invention includes the joint main body 1 having the inner intubation portion 4 inserted into the tip 3 of the pipe P, and the distal end opening cylindrical storage space portion surrounding the inner intubation portion 4 from the outer diameter side. In the pipe joint provided with the outer cylinder body 2 forming the outer cylinder body 2, the outer cylinder body 2 has a tapered inner peripheral surface 14 that is reduced in diameter toward the distal end opening side, and to the storage space portion 5. A biting claw that is built in the housing space 5 so as to be fitted to the tip 3 of the pipe P to be inserted and contracts the diameter while sliding on the tapered inner peripheral surface 14 as the pipe P moves in the drawing direction. A retaining ring 20 with 21 and a preload spring 22 that constantly urges and urges the retaining ring 20 toward the tip opening side are provided. The biting claw 21 of the retaining ring 20 is lightly in contact with the outer peripheral surface of the tip 3 of the pipe P from the beginning by the urging force. And, when the pipe P is about to be withdrawn immediately bite, it is possible to prevent withdrawal.

  Further, between the preload spring 22 and the retaining ring 20, an axial center-circular annular plate portion 23A and a radially inward and axially inward direction from the inner peripheral edge of the annular plate portion 23A are bent. Since the thin plate spring receiving ring 23 having the formed inclined plate portion 23B is interposed, the spring receiving ring 23 corrects the eccentricity of the tip portion of the preload spring 22 when the pipe P is inserted (centering). ), Avoiding the interference of the tip corner portion of the pipe P to the tip portion of the preload spring 22 and enabling smooth insertion. In addition, the inclined plate portion 23B immediately senses the start of pulling-out operation of the pipe P (movement in the direction of the axis L) and plays an auxiliary role to start the diameter-reducing operation of the retaining ring 20.

Further, the inclined plate portion 23B of the spring receiving ring 23 has a large number of locking teeth 24, always contacts the tip 3 of the inserted pipe P, and bites in as the pipe P moves in the drawing direction. With this configuration, the claw 21 of the retaining ring 20 bites in immediately after the start of the pulling-out operation of the pipe P, and it is possible to prevent slipping out.
Further, the retaining ring 20 has the slits 26 and 27 for promoting diameter reduction which are formed in the axial direction and alternately from the inner and outer opposite directions, so that the claw 21 is made of a hard material and at the same time, the entire radial direction. Therefore, the pipe P can be reduced in diameter, and the pipe P can be reduced in diameter with respect to various pipes P.

  Further, since the outer peripheral sealing material 81 that contacts the outer peripheral surface of the inserted pipe P is provided at the inner position of the storage space portion 5, the inner sealed state can be reliably held and connected. Even when a highly corrosive aqueous solution leaks between the outer layer side (resin coating part) and the inner layer side (metal layer) of the end face when a pipe P such as a copper double-layer pipe is connected, water leakage to the outside Can be reliably prevented. Furthermore, the entire storage space 5 was not filled with a highly corrosive aqueous solution, and the function of the retaining ring 20, the preload spring 22, the spring receiving ring 23, and the like was prevented from being deteriorated and the water pressure was applied. The connection state can be maintained for a long time by avoiding a dangerous state such as disconnection of the pipe P or hot water jetting. The retaining ring 20, the preload spring 22, the spring receiving ring 23 and the like do not need to be expensive members having high corrosion resistance, and an increase in manufacturing cost can be suppressed. Also. It can contribute to the popularization of pipe materials such as copper double-layer pipes that are highly reliable and can dispel worries about hygiene.

  Moreover, the sealing material 29 which contacts the inner peripheral surface of the tip 3 of the inserted pipe P is provided in the inner intubation section 4, and is disposed in an outer fitting shape on the inner intubation section 4, and the inserted pipe P Since an annular guide ring 28 is provided that guides and guides the tip 3 of the pipe P while being elastically reduced in diameter by sliding the seal member 29 along the intubation portion 4 while being pressed by the tip 3. Even if there is a sharp burr at the inner periphery of the tip of P, the pipe P can be inserted without damaging the sealing materials 29, 29. The sealing materials 29 and 29 can reliably prevent leakage such as water leakage from the inner diameter side.

  Here, in order to verify the operation and effect of the guide ring 28, the copper double-layer pipe was cut with a pipe cutter, and the burr generated on the inner peripheral edge of the tip was not removed as the test pipe P. A water tightness test was performed by inserting the pipe joint with 28 and the pipe joint without the guide ring 28. Tap water was used as a pressure medium, and a water pressure of 0.75 MPa was applied for 2 minutes. For the evaluation of the guide wheel 28, no outer peripheral sealing material 81 is provided in any pipe joint.

As a result, in the pipe joint not provided with the guide ring 28, leakage of tap water was detected 1 minute after being pressurized. No leakage was detected from the pipe joint provided with the guide ring 28.
After the test was completed, the pipe joint without the guide ring 28 was disassembled and verified. Then, the cause was that the sealing material 29 in contact with the inner peripheral surface of the pipe P was cut by burrs.
That is, it has been clarified that if the guide ring 28 is provided, it is possible to prevent water leakage even if the pipe P without being subjected to the deburring process is inserted (sealing can be maintained). .

DESCRIPTION OF SYMBOLS 1 Joint main body 2 Outer cylinder 3 Tip 4 Inner tube part 5 Space part
14 Tapered inner peripheral surface
20 Retaining ring
21 biting nails
22 Preload spring
23 Spring bearing ring
23A circular plate part
23B Inclined plate
24 locking teeth
26, 27 slit
28 Guide wheel
29 Sealing material
81 Outer seal material P Pipe

Claims (4)

A joint body (1) having an inner intubation part (4) to be inserted into the tip (3) of the pipe (P), and a cylindrical storage space part having a distal end opening surrounding the inner intubation part (4) from the outer diameter side In the pipe joint provided with the outer cylinder (2) forming (5),
The outer cylindrical body (2) has a tapered inner peripheral surface (14) whose diameter is reduced toward the distal end opening side, and at the distal end (3) of the pipe (P) inserted into the storage space (5). Biting claw (21) which is incorporated in the storage space (5) so as to be externally fitted and which is reduced in diameter while sliding on the tapered inner peripheral surface (14) as the pipe (P) moves in the drawing direction A retaining ring (20) with a preload, and a preload spring (22) for constantly elastically biasing the retaining ring (20) toward the opening side of the tip ,
Between the preload spring (22) and the retaining ring (20), the axially orthogonal annular plate portion (23A) and the radially inner side from the inner peripheral edge of the annular plate portion (23A) and A thin plate spring receiving ring (23) having an inclined plate portion (23B) bent in the axial inward direction,
The inclined plate portion (23B) of the spring receiving ring (23) has a large number of locking teeth (24), and is always in contact with the tip (3) of the inserted pipe (P). A pipe joint configured to bite in accordance with the movement in the pulling direction of P) . The pipe joint according to claim 1, wherein the retaining ring (20) has slits (26) and (27) for promoting diameter reduction which are formed in the axial direction and alternately cut from the inner and outer opposite directions . The pipe joint according to claim 1 or 2, wherein an outer peripheral sealing material (81) that comes into contact with an outer peripheral surface of the inserted pipe (P) is provided at a deep position of the storage space (5) . The inner tube (4) is provided with a sealing material (29) in contact with the inner peripheral surface of the tip (3) of the inserted pipe (P),
The pipe is inserted into the inner intubation section (4) in an outer fitting shape, and is pressed by the tip (3) of the pipe (P) to be inserted and slides along the inner intubation section (4). The pipe joint according to claim 1, 2 or 3, further comprising an annular guide ring (28) for guiding and guiding the tip (3) of the pipe (P) while elastically reducing the diameter of the seal material (29) .

Images