JP6097120B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

Conventionally, in a building, a pipe joint is used to connect a faucet fitting, a water supply header, and the like to a water supply pipe laid in the building. In this case, in order to improve workability, a so-called one-touch joint that can be connected by inserting a water supply pipe into the pipe joint is used (for example, see Patent Document 1).
In addition, as a water supply pipe, because it is hygienic, excellent in corrosion resistance, rich in flexibility and easy to install, etc., in order to prevent damage to the outer periphery of the crosslinked polyethylene pipe, polybutene pipe, or crosslinked polyethylene pipe, Alternatively, a multi-layer pipe provided with a tubular protective material is employed for heat insulation.

JP 2001-295966 A

  By the way, in the pipe joint described above, it is necessary to prevent the water supply pipe from slipping out. Therefore, a retaining ring formed with a plurality of claw pieces on the inner peripheral edge side is arranged facing the outer peripheral side of the water supply pipe. Yes. In other words, when the water supply pipe is inserted into the pipe joint, the claw piece of the retaining ring is elastically deformed to allow insertion of the water supply pipe. The water supply pipe is prevented from coming out by being deformed in the direction of reducing the diameter and biting into the outer peripheral surface side of the water supply pipe.

  As a result, in a pipe joint provided with a retaining ring, in order to support the load acting on the retaining ring when the water supply pipe comes out, the strength is sufficient to support the load on a cap nut or the like provided with the retaining ring. Metal and engineering plastics must be used. In addition, the number of parts is increased to support the retaining ring, and the cost is increased, and the outer diameter of the branch pipe joint in which the retaining ring is disposed on the outer peripheral surface side of the water supply pipe is increased.

  The present invention has been made in view of such problems, and is a pipe joint that can reliably prevent a pipe body such as a water supply pipe from coming out without using a retaining ring and connect the pipe body with one touch. Is to provide.

The present invention provides a joint main body having an inner cylindrical portion, an outer cylindrical member provided in a surrounding shape with respect to the inner cylindrical portion of the joint main body, and a flange at one end edge to force the inner cylindrical portion of the joint main body. An insertion guide that can be inserted, a seal groove for sealing is formed in the inner cylinder portion of the joint body, and the insertion guide is inserted into the inner cylinder portion of the joint body with the flange as a tip. A pipe joint into which a pipe body is inserted between an inner cylinder part and an outer cylinder member, and a retaining part of the pipe body protruding outward is formed continuously or intermittently in the circumferential direction on the outer peripheral surface of the insertion guide. In addition, a protrusion is formed on the outer peripheral surface of the inner cylinder portion on the downstream side in the tube insertion direction from the seal groove, and when the flange of the insertion guide hits the inner surface of the inner cylinder portion, the rear edge There locked to ridge, the the outer circumferential surface of the inner cylindrical portion of the joint body, the insertion direction of a pipe than ridges Side ring groove is formed in, and is characterized in that the shield element escape to the ring groove is provided.

  According to the present invention, in the pipe joint, the insertion guide is forcibly inserted into the inner cylinder portion of the joint body in advance with the flange as a tip, and the outer cylinder member is connected to the joint body so as to surround the inner cylinder portion. Assembled. And a pipe body is inserted between the inner cylinder part of the joint main body in a pipe joint, and the inside of an outer cylinder member.

  Here, when inserting the tube body, it is pushed against the flange beyond the retaining portion of the insertion guide, and when the insertion guide is pushed in to reach the inner surface of the inner cylinder portion, the rear end edge of the insertion guide becomes a protrusion. Locked to prevent retraction. Therefore, even if the tube body is pulled out, the insertion guide is prevented from retreating, so that the retaining portion of the insertion guide bites into the inner peripheral surface of the tube body and can be prevented from coming out. Further, since the tube body is supported by the joint body via the insertion guide and does not act on the outer cylinder member, the outer cylinder member does not require a material that can withstand high strength and can be formed in a small diameter.

  As a result, it is possible to reliably prevent the tube from coming out without using a retaining ring and connect the tube with one touch. In addition, since the retaining ring is not used, the number of parts can be reduced and compact formation can be achieved.

Also , in the unlikely event that the insertion of the tubular body is insufficient, the pull-out prevention ring increases the frictional resistance even if the tubular body is pulled out and a force is applied in the direction in which the insertion guide is retracted. Guide retraction can be reliably prevented.

In the present invention, the outer peripheral surface of the inner cylinder part, said the insertion direction upstream side of the tube than the sealing groove, the stepped portion continuous to the seal groove by engaging the rear edge of the insertion guide is formed when the rear edge inserted into the inner cylindrical portion is inserted guide is engaged with the step difference portion, the insertion guide is preferably to cover the seal of the sealing groove. Thereby, at the time of assembling the pipe joint, it is possible to prevent the drop-off while the seal is covered by the insertion guide. In addition, when inserting the pipe body at the construction site, the tip of the pipe body can be prevented from coming into contact with the seal and damaging the seal.

  ADVANTAGE OF THE INVENTION According to this invention, without using a retaining ring, pipes, such as a water supply pipe, can be reliably prevented from slipping out and connected with one touch.

It is a half sectional view showing one embodiment of a pipe joint of the present invention with a pipe. It is the A section enlarged view of FIG. FIG. 2 is a half cross-sectional view showing a pipe body inserted into the pipe joint of FIG. 1. It is the B section enlarged view of FIG. It is principal part sectional drawing which shows other embodiment of the pipe joint of this invention. It is principal part sectional drawing which inserts a pipe body in the pipe joint of FIG. It is principal part sectional drawing which shows another embodiment of the pipe joint of this invention. It is principal part sectional drawing which inserts a pipe body in the pipe joint of FIG. It is sectional drawing which shows the modification of a slip-out prevention ring. It is sectional drawing which shows the other modification of a slip-out prevention ring.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an embodiment of the pipe joint 1 of the present invention.

  The pipe joint 1 is composed of a joint body 2 having a flow path at the center, an outer cylinder member 3 connected to the joint body 2, and an insertion guide 4 fitted into the joint body 2, such as a gun metal. It is formed from a copper alloy.

  The joint body 2 includes a hexagonal nut-like flange portion 21 that can engage a tool such as a spanner at a substantially middle portion in the length direction, and the outer cylinder member 3 can be screwed to one side with the flange portion 21 interposed therebetween. A male screw 22 and an inner cylinder portion 23 into which the insertion guide 4 can be inserted are formed in this order, and a male screw 24 (parallel pipe thread) that can be screwed to a connection object such as a faucet fitting is formed on the other side. And the inner cylinder part 23 of the coupling main body 2 is formed with two seal grooves 25 at a substantially intermediate portion thereof, and seals (O-rings) S are respectively disposed in the seal grooves 25. . Further, on the outer peripheral surface of the inner cylinder portion 23 of the joint body 2, a protrusion 26 having an outer diameter slightly larger than the inner diameter of the insertion guide 4 is adjacent to the seal groove 25 on the downstream side in the insertion direction of the tube body 10. A stepped portion 27 having an outer diameter corresponding to the inner diameter of the insertion guide 4 is formed continuously with the seal groove 25 on the upstream side in the insertion direction of the tube body 10 while being formed in the circumferential direction.

  Here, the outer diameter of the inner cylinder portion 23 of the joint body 2 is set to be slightly larger than the inner diameter of the insertion guide 4, and the inner cylinder portion from the boundary surface between the one-side male screw 22 and the inner cylinder portion 23. The length to the ridge 26 formed on the outer peripheral surface of 23 is set to coincide with the length of the insertion guide 4. Furthermore, when the insertion guide 4 is fitted and inserted into the inner cylinder portion 23 of the joint body 2 with the flange 41 as a tip, and the tip is run on the ridge 26, the rear end edge is disposed on the step portion 27 and locked. Is set to

  The outer cylinder member 3 is a cylindrical body that surrounds the inner cylinder portion 23 of the joint body 2 and has an internal thread 31 that can be screwed into the one-side male thread 22 of the joint body 2 at one end.

  The insertion guide 4 is a cylindrical body having a flange 41 at one end edge that is slightly lower than the thickness of the tube body 10. A retaining portion 42 having a substantially right triangular shape with a gradually increasing diameter is formed. Further, the insertion guide 4 is formed to have an inner diameter corresponding to the outer diameter of the inner cylinder portion 23 of the joint body 2 except for the other end edge portion. On the other hand, the other end edge portion of the insertion guide 4 is formed in a tapered shape slightly toward the other end edge, and is formed to be slightly smaller in diameter than the outer diameter of the inner cylinder portion 23 of the joint body 2. Yes.

  In this case, the retaining portion 42 may be formed continuously in the circumferential direction or intermittently in the circumferential direction.

  Next, a construction procedure for connecting the pipe body 10 such as a water supply pipe to a faucet fitting or the like to be connected using the pipe joint 1 configured as described above will be described.

  First, in the pipe joint 1, the insertion guide 4 is forcibly inserted into the inner cylinder portion 23 of the joint main body 2 in advance in the factory, and further, the outer cylinder member 3 is screwed and assembled (see FIG. 1). That is, after the seals S are respectively disposed in the seal grooves 25 of the inner cylinder part 23 in the joint body 2, the insertion guide 4 is forcibly inserted into the inner cylinder part 23 with the flange 41 as a tip, and the flange 41 The side tip is riding on the ridge 26, and the insertion guide 4 covers the outer peripheral surface side of the seal S. At this time, when the rear end edge of the insertion guide 4 increases in diameter corresponding to the outer diameter of the inner cylinder portion 23 and the rear end edge reaches the stepped portion 27, it is restored to the original outer diameter by the spring back, and the step It falls into the part 27 and is locked to prevent retreat. Next, the outer cylinder member 3 is fitted and inserted through the inner cylinder portion 23 of the joint body 2, and is connected by screwing the female screw 31 into the one-side male screw 22.

  The pipe joint 1 assembled in this way is first connected to a connection object such as a faucet fitting at the construction site. Specifically, the other side male screw 24 of the fitting body 2 of the pipe fitting 1 is screwed into a female screw formed at the end edge of a faucet fitting or the like, and a wrench is engaged with the flange portion 21 to rotate the pipe fitting 1. And connect by tightening. If the pipe joint 1 is connected to the connection target, the pipe body 10 is grasped, and the shaft of the inner cylinder part 23 is placed in the space between the outer peripheral surface of the inner cylinder part 23 and the inner peripheral surface of the outer cylinder member 3 in the joint body 2. Insert the core and the axial center of the tube 10 in alignment.

  When the pipe body 10 is inserted into the pipe joint 1, the distal end of the pipe body 10 rides on the outer peripheral surface side of the insertion guide 4 and abuts against the flange 41 beyond the retaining portion 42 formed on the outer peripheral surface of the insertion guide 4. At this time, since the insertion guide 4 covers the seal S, the tip of the tube body 10 is prevented from coming into contact with the seal S when the tube body 10 is inserted. That is, the tip of the tube body 10 is in contact with the seal S, and the seal S is separated from the seal groove 25 and is prevented from being damaged.

  When the tube body 10 is still pushed in with the tip of the tube body 10 abutting against the flange 41 of the insertion guide 4, the tube body 10 moves along the outer peripheral surface of the inner cylinder portion 23 via the insertion guide 4. When the flange 41 of the insertion guide 4 hits the boundary surface between the one-side male screw 22 and the inner cylindrical portion 23, the connection work of the pipe body 10 is completed, and the pipe body 10 is connected to the connection target via the pipe joint 1. Can be connected.

  Here, when the rear end edge of the insertion guide 4 gets over the protrusion 26, the diameter is reduced by the spring back, and the tube 10 is locked to the downstream end surface in the insertion direction. That is, the rear end edge of the insertion guide 4 is locked to the protrusion 26, and its retreat is prevented. On the other hand, when the tube body 10 is inserted into the insertion guide 4, the tip thereof is abutted against the flange 41 beyond the retaining portion 42 formed on the outer peripheral surface of the insertion guide 4. Therefore, when a force in the pulling direction is applied to the tube body 10, the retaining portion 42 of the tube body 10 is coupled with the insertion guide 4 being locked to the protrusion 26 of the inner cylinder portion 23. It bites into the inner peripheral surface side to prevent it from coming out (see FIGS. 3 and 4).

  As mentioned above, it can connect by inserting the pipe body 10 in the pipe joint 1, and it can construct efficiently. Moreover, even if a pulling-direction force is applied to the tube body 10, the retaining portion 42 of the insertion guide 4 that is locked to the protrusion 26 of the joint body 2 bites into the tube body 10 to reliably prevent the tube body 10 from coming out. Can do. Further, the force in the pulling direction of the tube body 10 is supported by the joint body 2 via the insertion guide 4 and does not act on the outer cylinder member 3, so that the outer cylinder member 3 does not require a particularly large strength and is thin. It can be formed in a small diameter, and the entire pipe joint 1 can be formed in a small diameter and compact, and the number of parts can be reduced to the minimum necessary to reduce the cost.

  When assembling the pipe joint 1, the insertion guide 4 is forcibly inserted into the inner cylinder portion 23 of the joint body 2, and the rear end edge is locked at a position covering the seal S. However, depending on the number, size, etc. of the seal grooves 25, the step portions 27 continuous to the seal grooves 25 on the upstream side of the inner cylinder portion 23 are illustrated. A locking groove may be formed, and the rear end edge of the insertion guide 4 may be locked in the locking groove.

  By the way, in embodiment mentioned above, when the insertion guide 4 is extruded by insertion of the pipe body 10, and the flange 41 reaches the boundary surface of the one side male screw 22 and the inner cylinder part 23, the rear edge is the protrusion 26. The insertion guide 4 is set so as to be prevented from retracting. Therefore, when the insertion guide 4 does not reach the boundary surface between the one-side male screw 22 and the inner cylindrical portion 23, the tubular body 10 may be pulled out.

  That is, the tube body 10 is prevented from being pulled out by the retaining portion 42 of the insertion guide 4 and is sealed by the seal S. When no water leakage is found by the water flow test, the tube 10 is used over time, due to water pressure or the like. Assuming that the tube body 10 starts retreating together with the insertion guide 4, the insertion guide 4 is prevented from retreating with its rear edge contacting the seal member S or the like. If it leaves | separates from, the tubular body 10 will pull out completely.

  For this reason, it is preferable to prevent the insertion guide 4 from moving backward even if the insertion guide 4 is not inserted to the stroke end. Specifically, as shown in FIGS. 5 and 6, a ring groove 28 is formed on the outer peripheral surface of the inner cylinder portion 23 on the downstream side of the protrusion 26 in the insertion direction of the tube body 10, and the ring groove 28 is provided with a slip-out prevention ring R that increases the frictional resistance to prevent the insertion guide 4 from retreating. The pull-out prevention ring R is formed of rubber or the like, and a plurality of lips r are inclined on the outer peripheral surface in the insertion direction of the tube body 10.

  Thereby, when the tubular body 10 is inserted, the insertion guide 4 is pushed out while pushing down the lip r of the slip-out prevention ring R. Here, if the insertion guide 4 is not pushed into the boundary surface between the one-side male screw 22 and the inner cylinder portion 23 through the tube body 10, a force in the pulling direction acts on the tube body 10 for some reason. Thus, when the insertion guide 4 is about to come out via the retaining portion 42, the lip r of the withdrawal prevention ring R rises to increase the frictional resistance against the backward movement of the insertion guide 4, thereby preventing the backward movement of the insertion guide 4. . Therefore, the insertion guide 4 can be prevented from moving backward, and the tubular body 10 can be detached from the retaining portion 42 without causing a relative speed difference between the insertion guide 4 and the tubular body 10. Can be reliably prevented.

  In this case, since the insertion guide 4 can be prevented from retreating by the escape prevention ring R, the protrusion 26 is not necessarily required as shown in FIGS. In other words, even if the insertion guide 4 is not pushed into the boundary surface between the one-side male screw 22 and the inner cylinder portion 23 via the tube body 10, the withdrawal guide ring R reliably prevents the insertion guide 4 from retreating. be able to.

  Further, as the slip-out prevention ring R, insertion of the insertion guide 4 is allowed, and when the insertion guide 4 is pulled out, the frictional resistance is increased to prevent retraction. The shape is not limited. Further, as shown in FIG. 10, the insertion guide 4 is allowed to be inserted by using a part of the withdrawal prevention ring R such as a semicircular cross section or a 3/4 circular section, and the insertion guide 4 is removed. The frictional resistance can be increased to prevent the reverse, and the lip r is not necessarily required.

  In the above-described embodiment, the case where the pipe joint 1 is manufactured from a metal material such as a gun metal is illustrated. However, the load acting when the pipe body 10 is prevented from coming off is applied to the joint body 2 via the insertion guide 4. Since it supports, the outer cylinder member 3 does not require exceptional big intensity | strength. For this reason, the outer cylinder member 3 is not limited to a metal material, and may be a plastic material. In this case, if the outer cylinder member 3 is formed of a transparent or translucent plastic material, it is possible to grasp the insertion state of the tube body 10 from the outside, and it is possible to prevent insufficient insertion of the tube body 10, which is preferable. . In addition, since the resin-made outer cylinder member 3 can be forcibly fitted and connected to the joint body 2, the connection between the joint body 2 and the outer cylinder member 3 is limited to a male screw and a female screw. It is not a thing.

  Moreover, in the embodiment, the case where the other side of the pipe joint 1 is connected to a faucet fitting, a water supply header, or the like has been exemplified, but various forms can be adopted according to the connection object, and it is limited to a male screw. It is not a thing. For example, when the connection target is a male screw, in addition to the female screw being formed, it can be formed on an elbow, cheese, or a socket.

  Furthermore, in the above-described embodiment, the O-rings disposed in the two seal grooves 25 are exemplified as the seals S. However, the seals may be sealed in contact with the inner peripheral surface of the tubular body 10 with a set area. Therefore, the present invention is not limited to a plurality of O-rings. For example, a single wide seal in which convex portions having a substantially semicircular cross section are formed on the outer peripheral surface of a substantially flat cross section can be used. In this case, it becomes one seal groove having a width corresponding to the width of the seal.

1 Pipe Fitting 2 Fitting Body 21 Flange Part 22, 24 Male Thread (Connecting Part)
23 Inner cylinder part 25 Seal groove 26 Projection 27 Step part 28 Ring groove 3 Outer cylinder member 4 Insertion guide 41 Flange 42 Retaining part 10 Tubular body S Seal R Retraction prevention ring

Claims (2)

A joint body having an inner cylinder part, an outer cylinder member provided in a surrounding manner with respect to the inner cylinder part of the joint body, and a flange at one end edge, which can be forcibly inserted into the inner cylinder part of the joint body An insertion guide, a seal groove is formed in the inner cylinder portion of the joint body, and the insertion guide is fitted and inserted into the inner cylinder portion of the joint body with the flange as a tip. A pipe joint in which a pipe body is inserted between an outer cylinder member,
A tubular body retaining portion protruding outward is formed on the outer circumferential surface of the insertion guide continuously or intermittently in the circumferential direction, and the outer circumferential surface of the inner cylinder portion is downstream of the sealing groove in the tubular body insertion direction. When the ridge is formed on the side and the flange of the insertion guide hits the inner surface of the inner cylinder part, the rear edge is locked to the ridge ,
A pipe joint characterized in that a ring groove is formed on the outer peripheral surface of the inner cylinder portion of the joint main body on the downstream side of the protrusion in the insertion direction of the pipe body, and an escape prevention ring is disposed in the ring groove . In the pipe joint according to claim 1,
On the outer peripheral surface of the inner cylinder portion, a stepped portion is formed on the upstream side of the seal groove in the insertion direction of the tubular body, locking the rear end edge of the insertion guide and continuing to the seal groove,
A pipe joint , wherein the insertion guide covers a seal in a seal groove when the insertion guide is inserted into the inner cylinder portion and the rear end edge is locked to the stepped portion .

Images