JP3212046U - Pipe joint - Google Patents

Abstract

Provided is a pipe joint in which pipes can be firmly connected by a strong coupling force to prevent unintentional separation, and pipes can be easily separated as needed. A pipe joint (1) includes a joint body (3) provided with a pipe receiving port (20) and a fastening nut (4) that is externally fitted to a pipe (P) and screwed into the pipe receiving port. A tapered portion 2a is provided on the inner periphery of the pipe receiving port, and an expandable / contractable biting member 5 is externally fitted to the pipe passed through the pipe receiving port so as to face the tapered portion, and is bitten by screwing the pipe receiving port and the fastening nut. The member is pushed into the tapered portion to reduce the diameter, and bites into the pipe to be bound. On the other hand, the pipe is easily separated from the joint body 3 by unscrewing the fastening nut to release the tapered portion and relatively moving the pipe receiving port and the pipe in the axial direction away from each other. [Selection] Figure 2

Description

  The present invention relates to a pipe joint. More specifically, the pipe can be firmly connected by a strong coupling force to prevent unintentional separation of the pipe, but the pipe can be easily separated as necessary. Regarding pipe joints.

  FIG. 9 is a cross-sectional view showing a conventional pipe joint 50, which is described in, for example, Patent Document 1. The pipe joint 50 includes a joint body 52 provided with a pipe receiving port 52A into which an end portion of the pipe 51 is inserted, and a fastening nut 53 that is externally fitted to the pipe 51 and can be screwed to the outer peripheral portion of the pipe receiving port 52A. A sleeve 54 is disposed between the pipe 51 and the pipe receiving port 52A, a tapered portion 52a is formed on the inner periphery of the tip of the pipe receiving port 52A, and a tapered portion 54a is formed on the outer periphery of the sleeve 54.

  In the pipe joint 50, when the fastening nut 53 is screwed and fastened to the pipe receiving port 52A, the tapered portion 52a of the pipe receiving port 52A and the tapered portion 54a of the sleeve 54 are slidably contacted with each other, and the sleeve 54 is reduced in diameter. As a result, the pipe 51 is connected in a state where its outer peripheral surface is held by surface contact with the inner peripheral surface of the sleeve 54.

  However, both the inner peripheral surface of the sleeve 54 and the outer peripheral surface of the pipe 51 are smooth, and even if the smooth surfaces come into surface contact, the friction generated between these two surfaces is not so great. Therefore, the holding force of the pipe 51 by the sleeve 54 is weak, and the pipe cannot be connected with a strong coupling force. Therefore, there is a possibility that unintentional separation of the pipe occurs.

JP 2003-194268 A

  The present invention has been made in view of the above circumstances, and it is possible to firmly connect the pipes with a strong coupling force to prevent unintentional separation of the pipes, but to separate the pipes as necessary. The purpose is to provide a pipe joint that is easy to handle.

In order to achieve the above object, a pipe joint according to the present invention is a pipe joint including a joint body provided with a pipe receiving port, and a fastening nut that is externally fitted to the pipe and can be screwed onto the outer periphery of the pipe receiving port. And
A tapered portion is provided on the inner periphery of the opening end of the pipe receiving port, and a pipe that is passed through the pipe receiving port has a bite member that can be expanded and contracted facing the outer end of the tapered portion, and is fastened to the pipe receiving port. The biting member is pushed into the taper portion by screwing and fastening with the nut to reduce the diameter, and bites into the pipe to be bound.

  In the pipe joint having the above-described configuration, when the fastening nut is screwed and fastened to the pipe receiving port, the biting member is pushed into the tapered portion to reduce the diameter, and the pipe is bitten into the pipe by the tightening force generated by the reduced diameter. As a result, the holding force of the pipe by the pipe receiving port is increased, and the pipe can be firmly connected with a strong coupling force. Thus, unintentional separation of the pipe is prevented. On the other hand, when the fastening nut is unscrewed, the taper portion is released. Therefore, when the pipe receiving port and the pipe are moved relative to each other in the axial direction, the pipe is easily separated from the joint body. Therefore, it becomes easy to separate the pipes as necessary.

  The pipe connected to the pipe joint according to the present invention is a synthetic resin-coated pipe, and the biting member is a metal wire having a circular cross section. According to this, the tightening force generated by the reduction in diameter of the hardened biting member is concentrated on the synthetic resin coating layer with low hardness, and the biting member easily bites into the synthetic resin coating layer and binds with strong binding force. It is possible to firmly connect the pipes. Moreover, when the cross section of the biting member is circular, a groove having a circular arc cross section is formed in the synthetic resin coating layer. Thereby, the damage of the groove | channel by a stress concentration and by extension, the damage of a synthetic resin coating layer can be prevented.

  The biting member of the pipe joint according to the present invention is provided with a missing circle portion. According to this, the diameter can be easily reduced by pushing into the tapered portion to increase the tightening force, the biting into the pipe can be promoted, and the pipe can be strongly bound and strongly connected with a strong coupling force.

  The pipe joint of the present invention has a tightening force generated by the reduction in diameter of the biting member so that the biting member bites into the pipe and is tightened. This makes it possible to firmly connect the pipes. Therefore, unintentional separation of the pipe can be reliably prevented. On the other hand, when the fastening nut is unscrewed, the taper portion is released. Therefore, when the pipe receiving port and the pipe are moved relative to each other in the axial direction, the pipe is easily separated from the joint body. Therefore, it becomes easy to separate the pipes as necessary.

It is a perspective view showing one embodiment of a pipe joint concerning the present invention. It is a vertical side view which shows the state which connected one pipe to one pipe receptacle of the pipe joint of FIG. It is an enlarged front view showing one embodiment of a biting member. It is a vertical side view which shows the 1st step of the connection procedure of one pipe. It is a vertical side view which shows the 2nd step of the connection procedure of one pipe. It is an expanded sectional view showing one embodiment of the bite binding of the bite member. It is a perspective view which shows other embodiment of the pipe joint which concerns on this invention. It is a perspective view which shows further another embodiment of the pipe joint which concerns on this invention. It is explanatory drawing of a prior art example.

  Hereinafter, preferred embodiments of a pipe joint according to the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of a pipe joint according to the present invention, FIG. 2 is a vertical side view showing a state where one pipe is connected to one pipe receiving port of the pipe joint of FIG. 1, and FIG. 3 is a biting member. 4 is an enlarged front view showing one embodiment of the present invention, FIG. 4 is a longitudinal side view showing the first stage of the connecting procedure of one pipe, FIG. 5 is a longitudinal side view showing the second stage of the connecting procedure of one pipe, FIG. Is an enlarged cross-sectional view showing an embodiment of the bite-in binding of the bite-in member, FIG. 7 is a longitudinal side view showing another embodiment of the pipe joint according to the present invention, and FIG. 8 is still another embodiment of the pipe joint according to the present invention. FIG.

  As shown in FIGS. 1, 2 and 4, the pipe joint 1 has two pipes P (however, only one pipe P is shown in FIGS. 2 and 4). An elbow-type joint body 3 provided with two pipe receptacles 20 and 21 to be inserted, and a fastening nut that is externally fitted to the end of each pipe P and can be screwed separately to the outer circumference of each pipe receptacle 20 and 21 4 (however, only the fastening nut 4 screwed into one of the pipe receiving ports 20 is shown in FIGS. 2 and 4), and the tapered portion 2a is formed on the inner periphery of the open end of each of the pipe receiving ports 20 and 21. The pipe P passed through the pipe receiving ports 20 and 21 (however, only the pipe P passed through one pipe receiving port 20 is shown in FIG. 2) can be expanded and contracted. Biting member 5 at the outer end of tapered portion 2a Each biting member 5 is pushed into the tapered portion 2a to be reduced in diameter by being screwed and fastened with the pipe receiving ports 20 and 21 and the fastening nut 4, and is bitten into each pipe P to be bound ( However, in FIG. 2, one biting member 5 is pushed into the tapered portion 2a to reduce the diameter, and bites into one pipe P and is tightened.

  The joint body 3 of this embodiment is formed of a molded body of hard synthetic resin such as PBT resin. As shown in FIG. 6, the pipe P has a steel core P1 formed of a synthetic resin coating layer P2 such as AAS resin. It consists of a coated synthetic resin-coated pipe.

  As shown in FIGS. 2 and 4, male threads 2 b into which the fastening nuts 4 are screwed are provided on the outer circumferences of the pipe receptacles 20 and 21 in the joint body 3, and pipes are provided inside the pipe receptacles 20 and 21. Insertion holes 2c are provided, and these pipe insertion holes 2c are slightly smaller in diameter and communicate with each other via a bent communication path 2d. The rear end of each pipe insertion hole 2c and both ends of the communication path 2d are annular. It is continuous via the contact surface 2e. The inner diameter of each pipe insertion hole 2c is set to be substantially the same as the outer diameter of the pipe P and is set to a size that allows the insertion and removal of these pipes P. The inner circumference of the opening end portion extends from the back side to the opening end. A tapered portion 2a that gradually increases in diameter at a predetermined inclination angle is provided.

  Each fastening nut 4 of the present embodiment is formed of a hard synthetic resin molded body such as PBT resin, and has a cylindrical shape with both ends opened in the axial direction. A pipe insertion hole 4A for externally fitting 4 to the pipe P is provided, and an internal thread 4a to be engaged with the external thread 2b on the outer periphery of the pipe receiving opening 20 is provided on the inner periphery of the end in the pipe receiving opening direction. The inner diameter of the pipe insertion hole 4A is substantially the same as the outer diameter of each pipe P and is large enough to allow the insertion and removal of these pipes P, that is, the same as the inner diameter of the pipe insertion hole 2c provided in each of the pipe receiving ports 20 and 21. The size is set. As a result, the end of the female screw 4a in the opposite pipe receiving direction and the end of the pipe insertion hole 4A in the pipe receiving direction are continuous via the annular pressing surface 4b.

  As shown in FIGS. 2 and 3, the biting member 5 is formed of a circular ring formed of a stainless steel wire having a circular cross section, and in the present embodiment, is configured to be non-endless by a notch portion 5 a, and the inner diameter thereof is The pipe P is substantially the same as the outer diameter of the pipe P and allows the insertion and removal of the pipe P, that is, the inner diameter of the pipe insertion hole 2c provided in each of the pipe receiving ports 20 and 21, and the pipe insertion hole 4A of each fastening nut 4. The outer diameter is set to be approximately equal to the maximum inner diameter of the tapered portion 2a of each of the pipe receiving ports 20 and 21.

Below, the connection procedure of the pipe P by the pipe joint 1 of this embodiment is demonstrated.
The joint body 3 in the pipe joint 1 of the present embodiment is an elbow type provided with two pipe receptacles 20 and 21, and pipes P are connected to the pipe receptacles 20 and 21, respectively. Since the structure of the receptacles 20 and 21 is the same as described above, the connection procedure of each pipe P is the same in each pipe receptacle 20 and 21. Therefore, only the procedure for connecting one pipe P to one pipe receiving port 20 will be described, and the description and illustration of the procedure for connecting the other pipe P to the other pipe receiving port 21 will be omitted.

  First, as shown in FIG. 4, the fastening nut 4 is fitted on the end of the pipe P, and then the biting member 5 is fitted. The fastening nut 4 is externally fitted to the end portion of the pipe P by inserting the end portion of the pipe P from the opposite side of the female screw 4a into the pipe insertion hole 4A. Next, as shown in FIG. 5, the end portion of the pipe P is inserted into the pipe insertion hole 2c of the pipe receiving port 20, and the end surface is brought into contact with the annular contact surface 2e. Next, the fastening nut 4 is slid toward the pipe receiving port 20, and the fastening nut 4 is brought close to the pipe receiving port 20. Thereby, the biting member 5 is pressed and slid by the annular pressing surface 4b, and opposes near the outer end (right end in the illustrated example) of the tapered portion 2a. Next, the female screw 4a of the fastening nut 4 is screwed into the male screw 2b on the outer periphery of the pipe receiving port 20 and fastened as shown in FIG. In addition, the fastening nut 4 can be firmly fastened to the pipe receiving port 20 by hand tightening using a dedicated spanner after hand tightening by hand and turning around the axis.

  As the fastening nut 4 is fastened as shown in FIG. 2, the biting member 5 is pressed by the annular pressing surface 4b and is pressed into the tapered portion 2a to reduce the diameter. Due to the tightening force generated by this reduced diameter, the synthetic resin coating layer P2 of the pipe P is cut into and bound as shown in FIG. As a result, the holding force of the pipe P by the pipe receiving port 20 shown in FIG. 2 becomes strong, and the pipe P can be firmly connected with a strong coupling force. Therefore, unintentional separation of the pipe P is prevented. On the other hand, when the fastening nut 4 is unscrewed, the tapered portion 2a is opened. Therefore, when the pipe P is pulled in the right direction in FIG. 2, the pipe P is easily separated from the joint body 3. In other words, when the pipe receiving port 20 and the pipe P are relatively moved in the axial direction away from each other, the pipe P is easily separated from the joint body 3. Therefore, it becomes easy to separate the pipe P as necessary.

  Since the pipe P is made of a synthetic resin-coated pipe and the biting member 5 is made of a stainless steel wire having a circular cross section, the tightening force generated by the reduced diameter of the high-hardening biting member 5 is concentrated on the synthetic resin coating layer P2 having low hardness. Thus, the biting member 5 can easily bite into the synthetic resin coating layer P2 and be tightly bound, and the pipe P can be firmly connected with a strong bonding force. Further, since the cross section of the biting member 5 is circular, a groove 6 having a circular arc cross section is formed in the synthetic resin coating layer P2. Thereby, the damage of the groove | channel 6 by stress concentration and the damage of the synthetic resin coating layer P2 can be prevented.

  As shown in FIG. 3, the biting member 5 is configured to be non-endless by the cutout portion 5a. Therefore, the biting member 5 is easily reduced in diameter by being pushed into the tapered portion 2a shown in FIGS. 2 and 6 to increase the tightening force. The biting into the synthetic resin coating layer P2 is promoted, and the synthetic resin coating pipe P can be strongly bound and firmly connected with a strong bonding force.

  The pipe joint 1 of the above embodiment uses an elbow-type joint body 3 provided with two pipe receptacles 20, 21, and inserts the ends of the pipes P into the pipe receptacles 20, 21. Although the biting member 5 is bitten and bound in the inside of the tee 21, a tee-type joint body 3 provided with three pipe receiving ports 20, 21, and 22 as in the pipe joint 1 shown in FIG. 7. The end of the pipe P is inserted into each of the pipe receiving ports 20, 21, and 22 and the biting member 5 is inserted into each of the pipe receiving ports 20, 21, and 22 so as to be bound. Also good. In this pipe joint 1, one pipe is inserted into the pipe receiving ports 20, 21, and the biting member 5 is bited into two portions of the one pipe inside each pipe receiving port 20, 21, and is bound. The end of another pipe P is inserted into the remaining pipe receiving port 22, and the biting member 5 is bitten inside the pipe receiving port 22 so that the structure can be modified.

  Further, as in the pipe joint 1 shown in FIG. 8, the end of the pipe P is connected to each pipe receiving port 20, 21, 22, 23 using a joint body 3 provided with four pipe receiving ports 20, 21, 22, 23. The part may be inserted, and the biting member 5 may be bitten inside each of the pipe receiving ports 20, 21, 22, and 23 to be bound. In this pipe joint 1, one pipe is inserted into the pipe receiving ports 20, 21, and the biting member 5 is bited into two portions of the one pipe inside each pipe receiving port 20, 21, and is bound. The other pipe P can be inserted into the remaining pipe receiving ports 22 and 23, and the biting member 5 can be bitten inside the pipe receiving ports 22 and 23 so that the structure can be modified.

  That is, in the pipe joint 1 of the present invention, the number of pipe receptacles provided in the joint body 3 to be used is arbitrary as long as it is two or more, and the direction of the pipe receptacle can be arbitrarily set. The joint main body 3 provided with such pipe receptacles and the same number of fastening nuts 4 as the number of pipe receptacles are provided, and the biting member 5 is bitten into the pipe inside the pipe receptacle and is tightly bound. If the pipe joint 1 is applied, a structure such as a shelf made of a frame in which a plurality of pipes of a predetermined length are appropriately stretched in three dimensions is constructed steadily, and the structure is damaged due to unintentional separation of the pipes. Can be prevented.

  Although the pipe joint 1 of the present invention has been described based on each embodiment, the present invention is not limited to the configuration of the above-described embodiment, and structural modifications are possible as long as it does not depart from the spirit and technical idea of the present invention. It is.

  The pipe joint of the present invention is capable of firmly connecting pipes with a strong coupling force, so that structures such as shelves composed of frames consisting of multiple pipes of a predetermined length stretched appropriately in three dimensions are robust. Useful to build on.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2a Tapered part 20 Pipe receiving port 21 Pipe receiving port 22 Pipe receiving port 23 Pipe receiving port 3 Joint main body 4 Fastening nut 5 Biting-in member 5a Missing circle part P Pipe P2 Synthetic resin coating layer

Claims (3)

A pipe joint comprising: a joint body provided with a pipe receptacle; and a fastening nut that is externally fitted to the pipe and can be screwed onto the outer periphery of the pipe receptacle,
A tapered portion is provided on the inner periphery of the opening end of the pipe receiving port, and a pipe that is passed through the pipe receiving port has a bite member that can be expanded and contracted facing the outer end of the tapered portion, and is fastened to the pipe receiving port. A pipe joint characterized in that a biting member is pushed into a tapered portion by screwing and fastening with a nut to reduce the diameter, and bites into a pipe to be bound. In the pipe joint according to claim 1,
The pipe is a pipe joint made of a synthetic resin-coated pipe, and the biting member is a metal wire having a circular cross section. In the pipe joint according to claim 2,
The biting member is a pipe joint provided with a cutout portion.

Images