JP4630635B2 - Mechanical type pipe fittings - Google Patents

Description

  The present invention relates to a mechanical type pipe joint that is used for piping for water supply / hot water supply, cold / hot water, cooling water, and the like, and that can easily and quickly insert and connect one end portion of the piping in a seal shape and a retaining shape.

  For example, plug-in type pipe joints such as those shown in FIGS. 8 and 9 have been proposed as pipe joints used for piping for water supply and hot water supply. In this plug-in type pipe joint, opening portions 32 into which one end portions of the pipes P are respectively inserted are opened at both end portions of the tubular joint body 31, and the inner peripheral surface of the receiving portion 32 is formed outward in the tube axis direction. A tapered taper surface 33 is formed, and a tube end stopper portion 34 is provided on the inner periphery of the receiving portion 32. A lock ring 35 that is freely expandable and contractible and a rubber packing 36 that is disposed on the inner back side of the lock ring 35 are incorporated in the receiving portion 32 of the joint body 31. On the other hand, a lock ring groove 37 for engaging with the lock ring 35 is previously provided in a circumferential direction at a predetermined position on the outer surface of one end of the pipe P such as a thin stainless steel pipe connected by the pipe joint. In addition, one or two or more viewing windows 38 for visually confirming whether the lock ring 35 is securely engaged with the lock ring groove 37 are provided on the outer peripheral wall of the receiving portion 32 of the joint body 31. ing.

  In this plug-in type pipe joint, as shown in FIG. 8, once the end of the pipe P passes through the receiving portion 32 and the lock ring groove 37 passes the position of the lock ring 35, and the leading end of the pipe P is the pipe end stopper portion 34. 9, the tube P is slightly pulled back by hand as shown in FIG. 9, and the lock ring 35 is subjected to a diameter reducing action due to contact with the taper surface 33 in the course of this pull back, and thus into the lock ring groove 37. By engaging, the retaining function of the pipe P is ensured.

  According to this plug-in type pipe joint, the pipe P is simply grooved in advance, and when the pipe P is connected, the pipe P is inserted until it hits the pipe end stopper portion 34 in the joint body 31 and then pulled back slightly. There is an advantage that it can be easily and quickly connected by one-touch operation.

JP 2002-340256 A

  However, in the above-mentioned plug-in type pipe joint, the lock ring groove 37 needs to be processed into a sawtooth cross section as shown in the enlarged view in FIG. Since a dedicated tool is required for grooving the shape, even if grooving can be done at the factory, it is difficult to manage the wear and sag of the tool at the construction site. It is difficult to perform regular grooving processing due to the ring groove 37 falling. Further, such special-shaped grooving is not easy, and in the case of manual grooving, the sawtooth shape of the lock ring groove 37 having a sawtooth cross section may be erroneously machined in the reverse direction. When such a troubled grooving pipe P is inserted, there is a possibility of causing an accident in which the pipe P is pulled out after construction. Further, in order to confirm the completion of the insertion of the tube P, the visual recognition window 38 is necessary. However, this can be confirmed from the direction of the dark place or the part where the visual recognition window 38 on the outer peripheral wall surface of the receiving port 32 is absent. There were problems such as lack of certainty of confirmation. Furthermore, the pipe P rotates around the pipe axis in the joint body 31 due to the weight of a valve or faucet attached to the pipe P in the course of piping construction, and the predetermined pipe position cannot be maintained. There is also a problem that it requires a cumbersome work to be returned to the position.

  The purpose of the present invention is to solve such problems, and is a highly reliable mechanical type that is excellent in workability and can reliably prevent the occurrence of pipe pull-out accidents and water leakage accidents after construction. It is to provide a pipe joint.

The present invention includes a joint body which mouth part is opened to be inserted into one end of the tube, together with the large diameter tubular portion of larger inner diameter than the diameter of the outside of the socket portion of the joint body is formed, said receptacle Through the fitting of a rotating ring to the circumferential groove formed on the outer periphery of the portion and the circumferential groove formed on the inner periphery of the large-diameter cylindrical portion, so as to be relatively rotatable to the outer end portion in the tube axis direction of the receiving portion . and is connected to the retaining shape, and a clamp scaling diameter possible annular be fitted on the tube, has a clamping bolt is reduced in diameter the clamp provided on the clamp, the joint body It includes a pipe end stopper portion for receiving the insertion leading-edge portion of one end of the tube to the inner periphery of the socket portion, than the outer diameter of the pipe end are formed side by side in the axial direction of the tube outer portion from the stopper portion and the tube An annular rubber packing housing that accommodates a rubber packing with a small inner diameter A concave groove is provided on the inner periphery of the projecting end of the clamp projecting outward from the outer end in the tube axis direction of the receiving port. An annular lock ring receiving groove having a grooved surface is formed, and the lock ring receiving groove is accommodated with a lock ring having an edging tooth on the inner periphery and capable of expanding and contracting, and the pipe is connected to the joint from the clamp. The large diameter cylindrical portion of the clamp is clamped with the rotating ring sandwiched on the outer periphery of the joint portion of the joint body by inserting into the receiving portion of the main body and tightening the tightening bolt to reduce the diameter of the clamp. together is, it has the characteristics of the locking ring are as the diet included tooth bites into the outer periphery of the front Symbol tube is reduced in diameter.

  As a preferred aspect, in the pipe joint according to the present invention, the clamp may be formed in a cross-sectional C shape having a separation portion at a part of the circumference, and the separation portion may be tightened with the tightening bolt. . Further, the clamp may be composed of a pair of semicircular split clamps, and the butted ends on both sides of the pair of split clamps may be tightened with the tightening bolts. On the head side of the tightening bolt, there can be provided a constricted portion where the head is torn off when a certain tightening torque is applied.

According to the pipe joint of the above configuration, when connecting the pipe, insert one end of the pipe from the clamp into the receiving part of the joint main body by hand until the tip of the one end of the pipe hits the pipe end stopper, When the tightening bolt is rotated in the tightening direction, the diameter of the clamp is reduced, and the lock ring is also reduced due to this diameter reducing action, and the biting teeth are securely bited into the outer peripheral surface of the pipe by the diameter of the lock ring. Can do. Therefore, a firm retaining state of the tube can be obtained, and a state can be obtained in which the rubber packing is compressed between the outer peripheral surface of the one end portion of the tube and the inner peripheral surface of the receiving portion to seal the space therebetween.
Since the clamp can be rotated around the receiving portion before the tightening bolt is tightened, the tightening bolt can be arbitrarily changed to an angle and a position where the tightening bolt can be easily turned, and the tightening operation can be easily performed.

  Since the lock ring can be securely reduced in diameter by tightening the tightening bolt and its biting teeth can be securely bited into the outer peripheral surface of the pipe, the lock ring groove has not been machined in advance at a predetermined position on one end of the pipe. In addition, even if the lock ring groove is processed in advance, strictness is not required for the shape and depth of the groove, and simple groove formation is sufficient.

  By tightening the tightening bolt, the clamp, the joint body and the pipe can be integrated, so the pipe will be difficult to rotate due to the weight of the valve, faucet, etc. The pipe can be held in a predetermined piping position, and the piping workability can be promoted.

  If a constricted part is provided on the head side of the tightening bolt, if a tightening torque exceeding a certain level is applied to the tightening bolt, the head side will be torn off and it will not be possible to tighten any more. it can.

  Even after the construction, even if the pipe is pulled strongly in the pulling direction due to an earthquake or the like, the lock ring that moves in the same direction with the pipe has a further diameter reducing action due to the taper surface in the lock ring receiving groove. As a result, the bite into the pipe increases, so that it is possible to reliably prevent the one end of the pipe from coming out of the receiving portion, and to ensure the function of preventing the pipe from being pulled out.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a half-cut portion of a mechanical type pipe joint showing an embodiment of the present invention, FIG. 2 is a front view showing a partially broken clamp of the pipe joint of FIG. 1, and FIG. FIG. 4 is an enlarged view of a part A in FIG. 3, and FIG. 5 is a front view showing a state after tightening the clamp of the pipe joint of FIG. It is.

  1 to 3, a mechanical type pipe joint according to the present invention includes a joint body 1, a clamp 2, a rubber packing 3, a lock ring 4, and the like. The pipe P connected by this pipe joint is made of a thin stainless steel pipe or the like, and an annular lock ring groove may be provided at a predetermined position on the outer surface near one end portion thereof, but it may not be provided.

  The joint body 1 is formed in a cylindrical shape, and at least one end portion of the joint body 1 is opened with a receiving portion 5 into which one end portion of the pipe P is inserted, and an annular tube end stopper portion 6 is provided on the inner periphery of the receiving portion 5. In addition, an annular rubber packing housing groove 7 formed side by side on the outer side in the tube axis direction from the tube end stopper portion 6 is provided at a position biased radially outward from the tube end stopper portion 6. A rubber packing 3 having an inner diameter smaller than the outer diameter of the tube P is accommodated in the rubber packing accommodating concave groove 7.

  On the other hand, as shown in FIG. 2, the clamp 2 is formed in an annular shape having a C-shaped cross section having an opening 8 at a part of the circumference so that the diameter can be increased or decreased. In the free state, the clamp 2 has a large-diameter cylindrical portion 21 having an inner diameter portion slightly larger than the outer diameter of the receiving portion 5 of the joint body 1 and a small diameter that is substantially the same diameter as the inner diameter of the receiving portion 5. It is formed in the stepped cylinder shape which has the small diameter cylinder part 22 which has an internal diameter part. As shown in FIG. 1, the clamp 2 is received by fitting the large-diameter cylindrical portion 21 to the outer periphery of the receiving portion 5 of the joint body 1 so as to be relatively rotatable via a rotating ring 9 and in a retaining shape. A small-diameter cylindrical portion (protruding end portion) 22 is connected to the outer end portion in the tube axis direction of the mouth portion 5 so as to protrude. The inner diameter portion of the rotating ring 9 is fitted in a circumferential groove 10 formed on the outer periphery of the receiving portion 5, and the outer diameter portion of the rotating ring 9 is fitted in a circumferential groove 11 formed on the inner circumference of the large diameter cylindrical portion 21. Has been.

  In FIG. 1, the inner periphery of the small-diameter tubular portion (projecting end portion) 22 of the clamp 2 projecting outward from the outer end portion in the tube axis direction of the receiving portion 5 is constricted outward in the tube axis direction. An annular lock ring receiving groove 13 having a taper surface 12 is formed. In the free state, the lock ring receiving groove 13 is formed of a ring-shaped (C-shaped) metal ring whose inner diameter is smaller than the outer diameter of the pipe P, and is formed to be freely deformable and expandable. A lock ring 4 having a biting tooth 4a and having an expandable / contractable diameter can be accommodated.

  As shown in FIG. 2, a clamping bolt 14 is inserted between the open ends 22 a and 22 b facing each other at the open portion 8 of the small-diameter cylindrical portion 22 of the clamp 2. A stepped bolt insertion hole 15 through which the fastening bolt 14 is passed in a loosely fitting manner is formed at one open end 22a, and a female screw 16 that is screwed with the male screw of the fastening bolt 14 is formed at the other open end 22b. . A nut may be used in place of the female screw 16. The tightening bolt 14 is provided with a constricted portion 17 on the head side so that the head 14a on which the tightening tool is applied is torn off when a certain tightening torque is applied.

  In this way, in the pipe joint in which the clamp 2 with the fastening bolts 14 is coupled to the joint body 1 and the rubber packing 3 and the lock ring 4 are built in, the pipe P is connected as shown in FIG. One end portion is inserted from the clamp 2 into the receiving portion 5 of the joint body 1 until the tip of the one end portion of the pipe passes through the lock ring 4 and the rubber packing 3 and hits the pipe end stopper portion 6. insert.

  Thereafter, when the tightening bolt 14 is rotated in the tightening direction, the diameter of the lock ring 4 is reduced as the clamp 2 is reduced in diameter. Before the tightening bolt 14 is tightened, the tightening bolt 14 can be arbitrarily changed to a desired angle and position where the work can be easily performed by rotating the clamp 2 around the receiving portion 5 via the rotating ring 9. It can be done easily.

  When the clamp 2 is reduced in diameter by tightening the tightening bolt 14, the lock ring 4 is reduced in diameter at the same time, so that the biting teeth 4a bite into the outer peripheral surface of the pipe P (see FIG. 4). The pipe P is reliably prevented from being pulled out by being surely smaller than the outer diameter. Therefore, the lock ring groove does not have to be processed in advance at a predetermined position on one end of the pipe P, and even if the lock ring groove is processed in advance, strictness is not required for the shape and depth of the groove. Simple grooving is sufficient, and even in this case, extraction of the tube P can be reliably prevented. At the same time that the tube P is securely pulled out, the rubber packing 3 is compressed between the inner peripheral surface of the receiving port 5 and the outer peripheral surface of one end of the tube P, so that there is no water leakage between them. can get.

  By tightening the clamp 2 with the tightening bolts 14, the large-diameter cylindrical portion 21 of the clamp 2 is firmly tightened integrally with the outer periphery of the receiving portion 5 of the joint body 1 with the rotary ring 9 interposed therebetween, and the clamp 2 and the joint body 1 are connected. Since the clamp 2 and the pipe P can be integrated through the biting of the biting teeth 4a of the lock ring 4 into the pipe P, the pipe P is attached to the pipe P in the course of this pipe construction. The pipe P is difficult to rotate due to the weight of a valve, faucet, or the like, so that the pipe P can be held at a predetermined piping position and the piping workability can be improved.

  When the tightening bolt 14 is applied with a tightening torque of a certain level or more, as shown in FIG. 5, the head portion 14a is torn off through the constricted portion 17, so that the tightening bolt 14 cannot be further tightened, thereby easily recognizing the completion of the construction. be able to.

  Even after the construction, even if the pipe P is strongly pulled in the pull-out direction due to an earthquake or the like, the lock ring 4 that moves in the same direction together with the pipe P is further fixed by the taper surface 12 in the lock ring receiving groove 13. Since the erosion into the pipe P increases due to the reduced diameter action, it is possible to reliably prevent the one end of the pipe P from coming out of the receiving portion 5.

  Even when the insertion of the pipe P is stopped before the end of the pipe P reaches the pipe end stopper portion 6 when the insertion of the pipe P is insufficient, the biting teeth 4a of the lock ring 4 are tightened by tightening the tightening bolts 14. Since the outer periphery of the pipe P is securely cut into the pipe P so as to be securely removed, the pipe P is not pulled out even in this insufficient insertion state.

  In the above embodiment, the clamp 2 is formed in a C-shaped cross section, but instead, it can be formed by a pair of semicircular divided clamps 23 and 24 as shown in FIG. In this case, by tightening the butted ends 23a, 24a on both sides of the pair of split clamps 23, 24 with the tightening bolts 14, the clamp 2 is reduced in diameter as in the case of the above embodiment, and at the same time the lock ring 4 is also reduced. It is supposed to be diameter. Further, when a tightening torque of a certain level or more is applied to the tightening bolt 14, the constricted portion 17 of the tightening bolt 14 is torn off as in the case shown in FIG. 5, so that the completion of construction can be easily recognized. Yes.

  The lock ring 4 that can be deformed to expand and contract is only required to have a shape having the biting teeth 4a on the inner periphery. Like the cross-sectional shape shown in FIG. It is not limited to what is formed. In addition, for example, it may be in the form of forming a toothed tooth 4a having a triangular cross section as shown in FIG.

  In each of the embodiments shown in FIGS. 5 and 6, when a tightening torque of a certain level or more is applied to the tightening bolt 14, the head 14 a is torn through the constricted portion 17, so that the completion of construction can be recognized. However, instead of this, in the embodiment shown in FIG. 5, the tightening bolt 14 is tightened until the open ends 22a and 22b of the clamp 2 come into contact with each other. In the embodiment shown in FIG. By tightening the tightening bolt 14 until the butted ends 23a and 24a of the clamps 23 and 24 come into contact with each other, the completion of construction can be recognized. However, as the tightening bolt 14 used in this case, it is not necessary to provide the constricted portion 17 on the head side, and it is sufficient to use a normal bolt.

1 is a half-broken cross-sectional view of a mechanical type pipe joint showing one embodiment of the present invention. FIG. 2 is a front view showing a partially broken clamp of the pipe joint of FIG. 1. FIG. 2 is a half-broken cross-sectional view showing a state where a pipe is inserted most deeply into the pipe joint of FIG. 1. It is an enlarged view of the A section in FIG. It is a front view which shows the state after tightening the clamp of the pipe joint of FIG. It is a front view which shows the clamp of the pipe joint of another Example corresponding to FIG. It is a partial cross section figure which shows the other example of the lock ring integrated in the pipe joint of FIG. FIG. 6 is a half-broken cross-sectional view of a state when a tube is inserted deepest into a conventional insertion-type pipe joint. FIG. 9 is a partial cross-sectional view of a state when the tube has been inserted into the insertion-type pipe joint of FIG.

P pipe 1 Joint body 2 Clamp 3 Rubber packing 4 Lock ring 4a Biting tooth 5 Receiving part 6 Pipe end stopper part 7 Rubber packing housing groove 8 Opening part 12 Taper surface 13 Lock ring housing groove 14 Fastening bolt 17 Constriction part 22 Projection end part 23, 24 Split clamp

Claims (4)

And the fitting body that the mouth part is opened to be inserted into one end of the tube, together with the large diameter tubular portion of larger inner diameter than the diameter of the outside of the socket portion of the joint body is formed on the outer periphery of the socket portion through the fitting of the rotary ring and formed circumferential groove on the inner circumference formed circumferential groove of said large diameter cylindrical portion rotatably relative to the tube axis direction outer end portion of the socket portion, and, retaining connected to Jo, and, the clamping of the expansion diameter can be annular to be fitted on the tube, has a clamping bolt is reduced in diameter the clamp provided in the clamp,
The joint body has a pipe end stopper portion for receiving the insertion leading-edge portion of one end of the tube to the inner periphery of the socket portion, is formed side by side in the axial direction of the tube outer portion from said pipe end stopper portion and said tube An annular rubber packing housing concave groove in which a rubber packing having an inner diameter portion smaller than the outer diameter is accommodated, and
An annular lock ring having a taper surface tapered toward the outside in the tube axis direction on the inner periphery of the projecting end portion of the clamp projecting outward from the tube shaft direction outer end portion of the receiving portion An accommodation concave groove is formed, and in the lock ring accommodation concave groove, an expandable / contractable diameter lock ring having a dent tooth on the inner periphery is accommodated,
The pipe is inserted into the receiving part of the joint body from the clamp, and the clamp is tightened to reduce the diameter of the clamp so that the large-diameter cylindrical part of the clamp is an outer periphery of the receiving part of the joint body. It said rotating sandwiched therebetween together tightened the ring, mechanical type of pipe joint, wherein the locking ring are as the diet included tooth bites into the outer periphery of the front Symbol tube is reduced in diameter.   The mechanical type pipe joint according to claim 1, wherein the clamp is formed in a cross-sectional C shape having a separation portion at a part of a circumference, and the separation portion is fastened by the tightening bolt.   The mechanical type pipe joint according to claim 1, wherein the clamp is composed of a pair of semicircular split clamps, and the butted ends on both sides of the pair of split clamps are fastened by the tightening bolts.   The mechanical type pipe joint according to any one of claims 1 to 3, wherein a constricted portion is provided on a head portion side of the tightening bolt so that the head portion is torn off when a certain tightening torque is applied.

Images