KR20000062875A - Pipe joint - Google Patents

Abstract

An object of the present invention is to provide a pipe joint which can be easily connected to a pipe by simply inserting the pipe without processing the end of the pipe, and as a solution means, a pipe joint for connecting a pipe. A sleeve having a tubular joint body and a slidably fit within the other end of the joint body so that a part thereof protrudes out of the joint body, and an abutting portion in which the end face of the tube abuts; An elastic O-ring retained in a circumferential state on the outer circumference of the portion protruding out of the joint body of the sleeve, and one end is mounted on the outer circumference of the other end of the joint body, and the O-ring in the middle portion And a terminal cylinder having a receiving portion of the terminal and having an anti-falling portion of the O-ring at the other end thereof, and inserting a tube from the opening of the terminal cylinder, the sleeve abuts. The portion is pushed into the tube pushed into the joint body, whereby said O-ring is by one at the same time being characterized in that from the sleeve, the shaft diameter to the tube is configured to close the outer circumference of the engine joint.

Description

Pipe joint {PIPE JOINT}

The present invention relates to a pipe joint that can easily connect a pipe.

29 shows an example of a conventional pipe joint. This pipe joint is for connecting the spiral wave pipe (not shown) and the straight pipe 10. Reference numeral 12 is a joint body, 14 is SR packing made of rubber and steel, 16 is a cut ring made of steel, which is formed by notching in a part of the circumferential direction, and (18) Is the terminal flow.

The joint body 12 integrally forms a corrugated cylindrical portion 20 into which a spiral wave tube is twisted, and a male cylindrical portion 22 having a male screw on its outer circumferential surface. The end face of the male barrel portion 22 is a tapered surface 24 whose inner diameter increases toward the tip, and the tapered surface of the end portion of the SR packing 14 abuts on the tapered surface 24. In addition, the terminal body 18 has a female threaded portion 26, one end of which is screwed with the male screw portion 22, and a tapered surface of which the inner diameter of the other end decreases toward the end. 28).

The corrugated tubular portion 20 of this pipe joint is connected by twisting a spiral wave tube. Thereafter, when the straight pipe 10 is inserted from the opposite side and the terminal cylinder 18 is screwed in, the cut ring 16 and the SR packing 14 are reduced together by the tapered surfaces 28 and 24, and the straight pipe Squeezed (10). The straight pipe 10 cannot be pulled out by the tight clamping of the cut ring 16, and the watertightness is maintained by the SR packing 14.

In conventional pipe joints, after inserting a straight pipe, it is necessary to screw a terminal cylinder, and since this screw tightening needs to be performed using a tool such as a belt wrench, there is a problem in that workability is poor.

For this reason, pipe joints that can be connected by simply inserting pipes have also been proposed (Japanese Patent Application Laid-Open No. 62-194281). However, these types of pipe joints are tapered for packing expansion at the end of the pipe. It is necessary to form a surface and a groove for holding the anti-falling ring, which is cumbersome to process the end of the pipe.

An object of the present invention is to provide a pipe joint that can be easily connected by simply inserting a tube without processing the end of the tube.

1 is a half cut side view showing an embodiment of a pipe joint according to the present invention.

FIG. 2A is a cross-sectional view taken along the line A-A of FIG. 1

FIG. 2B is a cross-sectional view taken along the line B-B in FIG. 1

Fig. 3 is a half cut side view showing a state in which a tube is connected by the tube joint of Fig. 1.

Fig. 4A is a sectional view when the tube is inserted in another embodiment of the tube joint according to the present invention.

4B is a cross-sectional view when the pipe is connected in another embodiment of the pipe joint according to the present invention.

4C is a cross-sectional view when a force to be pulled out to the pipe in another embodiment of the pipe joint according to the present invention is applied.

Fig. 5A is a side view showing the joint body of the pipe joints of Figs. 4A to 4C.

Fig. 5B is a front view showing the joint body of the pipe joints of Figs. 4A to 4C.

Fig. 6A is a rear view showing the terminal cylinder of the tube joint of Figs. 4A to 4C.

FIG. 6B is a cross-sectional view taken along the line A-A of FIG. 6A

7A to 7D are cross-sectional views taken along lines B-B to E-E of FIG. 6B, respectively.

7E is an enlarged cross-sectional view of the main portion of FIG. 6B.

Fig. 8A is a side view showing the sleeve of the tube joint of Figs. 4A to 4C.

Fig. 8B is a front view showing the sleeve of the tube joint of Figs. 4A to 4C.

9A and 9B and cross-sectional views showing the process of assembling the pipe joints of FIGS. 4A to 4C.

Fig. 10 is a half cut side view showing still another embodiment of a pipe joint according to the present invention.

Fig. 11 is a half cutaway side view showing a state in which a pipe is connected by the pipe joint of Fig. 10.

Fig. 12 is a half-absolute side view showing still another embodiment of a pipe joint according to the present invention.

FIG. 13 is a half-absolute side view when the tube is inserted into the tube joint of FIG.

Fig. 14 is a half cutaway side view when the pipe is connected by the pipe joint of Fig. 12;

Fig. 15 is a half cutaway side view when a force is drawn out from the tube in the state of Fig. 14;

16 is a cross-sectional view showing yet another embodiment of a pipe joint according to the present invention.

Fig. 17 is a half cutaway side view showing still another embodiment of a pipe joint according to the present invention.

18A is a cross-sectional view of a sleeve used in yet another embodiment of a pipe joint according to the present invention.

18B is a front view of a sleeve used in still another embodiment of the pipe joint according to the present invention.

Fig. 19 is a half cutaway side view showing an embodiment of a tube joint of the present invention using the sleeves of Figs. 18A and 18B.

Fig. 20 is a half cutaway side view showing a state in which a pipe is connected by the pipe joint of Fig. 19.

Fig. 21 is a cross-sectional view showing yet another embodiment of a pipe joint according to the present invention.

FIG. 22 is a cross-sectional view illustrating a state in which a pipe is connected by the pipe joint of FIG. 21.

Fig. 23 is a cross-sectional view showing yet another embodiment of a pipe joint according to the present invention.

FIG. 24 is a cross-sectional view showing a state in which a pipe is connected by the pipe joint of FIG.

Fig. 25A is a half cutaway side view of an O-ring attachment sleeve used in another embodiment of a pipe joint according to the present invention.

25B is a front view of an O-ring sleeve used in another embodiment of a pipe joint according to the present invention.

Fig. 26A is a plan view showing half of one side of a two-split joint body used in still another embodiment of a pipe joint according to the present invention.

Fig. 26B is a front view showing half of one side of a two-split joint body used in another embodiment of a pipe joint according to the present invention.

27A to 27C are plan views showing the assembling process of the pipe joint using the components shown in FIGS. 25, 26A and 2B.

28A and 28B are plan views showing a process of performing a connection after connecting a pipe using a pipe joint assembled in FIGS. 27 to 27C.

Fig. 29 is a half sectional side view showing a conventional tube joint.

<Explanation of symbols for main parts of drawing>

10: tube 10a: conduit

10b: relay tube 12: joint body

18: terminal fluid 20: waveform part

28: tapered surface 30: sleeve

32: O ring 34: Auxiliary O ring

36: cylindrical portion 38: arc-shaped convex portion

40: protrusion frame 42: cylindrical portion

44: taper barrel 50: groove

54: ridge 56: annular plate

64: protrusion (stopper part) 68: annular protrusion frame

69: C-shaped ring 70: plate part

72: bolt hole 74, 78: recessed portion

76: stone 80: bolt nut

82: tube joint

According to the present invention, a tube joint for connecting a tube is slidably fitted so that a part of the tubular joint body protrudes out of the joint body in the other end of the joint body. A sleeve having an abutting portion at which the end faces abutment, an elastic O-ring retained in a circumferential direction of the portion projecting out of the joint body of the sleeve, and one end at the other end of the joint body; It is mounted on the outer periphery of the terminal, and has a receiving body of the O-ring at the middle portion, and a terminal cylinder having an anti-separation portion of the O-ring at the other end, and when the tube is inserted from the opening of the terminal cylinder, the sleeve abuts Part of the tube is pushed by the tube into the joint body, whereby the O-ring is removed from the sleeve and reduced in diameter. A tube joint is provided that is configured to be in close contact with the outer circumference.

The tube joint of the present invention slidably fits a sleeve having a contact portion in which the end face of the tube abuts in the other end portion of the cylindrical joint body so that a part of the tube joint protrudes out of the joint body. On the outer circumference of the part protruding out of the main body, one end of the terminal body has a rubber elastic O-ring in the enlarged state, has an O-ring receiving portion in the middle portion, and an O-ring release preventing portion at the other end. Is mounted on the outer periphery of the other end of the joint body.

In the tube joint having such a configuration, when the tube is inserted from the opening of the terminal cylinder, the sleeve is pushed into the joint body by being pushed into the joint body at the portion where the sleeve abuts, whereby the O-ring is removed from the sleeve and reduced in diameter so that the outer periphery of the tube is reduced. Will be close to.

With the above-mentioned sleeve, the O-ring is held in a diameter-expanded state. Unlike the pipe joint described in Japanese Patent Application Laid-Open No. 62-194281, it simply pushes in the end of the pipe that is not subjected to any processing. It is possible to connect a pipe to a joint body only.

If the tube is to be pulled out, the O-ring engages with the O-ring release prevention portion at one end of the terminal cylinder, thereby showing resistance to the tube being pulled out.

The sleeve used for the tube joint of the present invention preferably has an inner diameter into which the tube can be inserted, and has an inward convex portion where the end face of the tube abuts.

The sleeve used for the pipe joint of the present invention may be one whose outer diameter is equal to or larger than the outer diameter of the tube, the inner diameter is set smaller than the outer diameter of the tube, and the end face of the tube is against the end face of the sleeve. .

The tube joint of the present invention has an elastic restoring force and a size close to both the outer circumferential surface of the tube and the inner circumferential surface of the terminal cylinder in a state where the O-ring is removed from the sleeve in order to maintain watertightness, and the joint body and the terminal cylinder It is preferable to set it as the structure which interposed the auxiliary O-ring for maintaining water tightness in between.

In the joint of the present invention, in general, the joint body and the terminal body are separate members, but if necessary, one end of the terminal body is integrally formed with the end of the joint body, so that the joint body and the terminal body are integrated. It can also be configured as an integrated configuration.

Moreover, it is preferable that the O-ring protrusion part of a terminal cylinder in the tubular joint of this invention becomes a taper surface whose inner diameter becomes small, so that an inner peripheral surface becomes a tip part.

In this way, when the pull-out force is applied to the inserted tube, the O-ring is sandwiched between the outer peripheral surface of the tube and the tapered surface of the terminal cylinder, and exhibits a strong pull-out resistance.

In addition, in the tube joint of the present invention, the O-ring held in the diameter-expanded state on the outer circumference of the sleeve is in close contact with the inner circumferential surface of the terminal cylinder, and the O-ring moves in the pipe insertion direction between the terminal cylinder and the sleeve. It is preferable to set it as the structure which has the space which makes it possible.

In this case, when the sleeve is pushed into the joint body by the insertion of the tube, the O-ring rolls or slides in the space, so that the resistance at the time of tube insertion becomes small and the insertion of the tube becomes easy.

In addition, if the O-ring can be moved in this way, the pipe is allowed to move until the O-ring comes into contact with the O-ring release prevention part of the terminal cylinder when a force in the direction of pulling out the pipe is applied. It can alleviate the force applied by In particular, when this pipe joint is used for connection of a pipe buried in the ground, there is an advantage that it is possible to cope with displacement of the pipe generated during an earthquake or ground subsidence.

In the case of the configuration in which the O-ring moves, it is preferable to form a raised portion in the middle of the movement range of the O-ring on the inner circumferential surface of the terminal cylinder.

If such a ridge is formed, when the sleeve is inserted from one end of the terminal cylinder after the O-ring is set at a position from the ridge in the terminal cylinder to assemble the pipe joint, As a result of the rotation of the O-ring pushed up, there is an advantage that the sleeve can be smoothly set inside the O-ring.

In addition, if the above-mentioned ridge is formed, the sleeve can be prevented from being moved by the rolling movement of the O-ring before the tube is inserted, and the O-ring can pass through the ridge in the process of inserting the tube. Since the pushing force becomes large and the pushing force becomes small after that, there is an advantage that the operator can sense whether the pushing of the pipe is properly performed.

In addition, the tube joint of the present invention has a structure in which a stopper portion which engages with the inner surface of the joint body when the sleeve enters the joint body by the inserted tube and prevents the sleeve from escaping from the joint body is formed. desirable.

In the form of the stopper portion, an elastically expanded portion that is in strong contact with the inner surface of the joint body by elastic repulsion and is engaged by the frictional force with the inner surface of the joint body, or a protrusion formed on the groove portion of the inner surface of the joint body is formed in the sleeve. It is preferable.

If the above stopper portion is formed on the outer circumference of the sleeve, the sleeve does not move together with the tube even after the tube is connected, even if the tube is slightly moved in the direction of pulling out the sleeve. The intimate state of the tube and the tube can be released to prevent the tube from being removed.

In the case where the pipe joint of the present invention needs to be dismantled after pipe connection (for example, used for temporary connection of pipes), the joint body and the terminal cylinder are integrally formed, and this is the central axis. It is preferable to have a dividable structure in terms of including.

In addition, the tubular joint of the present invention includes a cylindrical joint body, a sleeve in which a part of the joint body protrudes out of the joint body and is slidably fitted inside the joint body, and the joint body of the sleeve. Main O-rings and auxiliary O-rings made of rubber held on the outer periphery of the part protruding outwardly, an annular plate interposed between the main O-rings and the auxiliary O-rings, and one end of the joint body It is mounted on the outer periphery of the end, and the inner circumferential surface of the other end is a tapered surface whose inner diameter decreases toward the end, and the middle portion compresses the annular plate by pushing the auxiliary O-ring to the end of the joint body. It can also be set as the structure provided with the terminal cylinder which is hold | maintained at.

When the tube is inserted into the tube joint having such a configuration, the sleeve is pushed into the joint body by the tube joint, and the main O-ring and the auxiliary O-ring removed from the sleeve are brought into close contact with the outer circumference of the tube. The main O-ring is sandwiched between the outer circumferential surface of the tube and the tapered surface of the terminal cylinder, so that it cannot be pulled out, and the auxiliary O-ring is held close to the end face of the joint body, the outer circumferential surface of the tube and the annular plate to maintain watertightness.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail with reference to drawings.

Embodiment 1

Fig. 1 shows a tube joint according to an embodiment of the present invention, Fig. 2A is a sectional view taken along line A-A in Fig. 1, and Fig. 2B is a sectional view taken along line B-B in Fig. 1. 1, 2A and 2B, reference numeral 12 is a cylindrical joint body formed of high density polyethylene, etc., 18 is a terminal body formed of ABS resin, etc., 30 is made of ABS resin, or the like. The molded sleeve, 32 is an O ring with rubber elasticity, and 34 is an auxiliary O ring with rubber elasticity.

The joint body 12 integrally forms a corrugated cylinder portion 20 and a cylindrical portion 36 for twisting and connecting a spiral waved tube. A groove is formed in the outer periphery of the tip portion of the cylindrical portion 36, and the auxiliary O-ring 34 is mounted in the groove. In addition, on the outer circumference of the middle portion of the cylindrical portion 36, as shown in Figs. 1 and 2, an arc-shaped convex portion 38 having an arc length of approximately 90 ° vertices is spaced at equal intervals in the circumferential direction. It is formed at the point.

The sleeve 30 has an outer diameter which can slide-fit inwardly of the cylindrical portion 36 and an inner diameter into which a tube to be connected can be inserted. The sleeve 30 fits the one end part to the cylindrical part 36, and protrudes the other part outside the cylindrical part 36. As shown in FIG. Moreover, the inwardly protruding frame 40 in which the end surface of a pipe | tube hits is formed in the edge part (it may be an intermediate part) of the side fitted to the cylindrical part 36 of the sleeve 30. As shown in FIG.

On the outer circumference of the portion of the sleeve 30 protruding outward from the cylindrical portion 36, the O-ring 32 is kept in a larger diameter than when free. In addition, the O-ring 32 is also in close contact with the inner circumferential surface of the terminal cylinder 18, so that the cross section is flat and crushed.

The terminal cylinder 18 includes a cylindrical portion 42 having a portion to be fitted to the outer circumference of the cylindrical portion 36 of the joint body 12, and a portion for receiving the O-ring 32 and the sleeve 30, and a taper. The cylinder part 44 (the omission part of the o-ring 32) is integrally formed. The inner circumferential surface of the tapered cylinder portion 44 is a tapered surface 28 whose inner diameter decreases toward the end of the opening. On the inner surface of the end portion of the cylindrical portion 42 of the terminal cylinder 18, as shown in Fig. 2A, the circumferential length that the arcuate convex portion 38 of the joint body 12 can be pulled out in the axial direction can be inserted. Concave portion 46 and the engaging portion 48 is formed. Further, in the depth of the locking portion 48, as shown in Figs. 1 and 2B, a circumferential groove 50 into which the arcuate convex portion 38 of the joint body 12 enters is formed.

In order to assemble this pipe joint, a part of the sleeve 30 to which the O-ring 32 is mounted is first stored in the joint body 12. Subsequently, the cylindrical portion 36 of the joint body 12 which accommodates a portion of the sleeve 30 and the cylindrical portion 42 of the terminal cylinder 18 are formed in the concave portion 46 of the arcuate convex portion 38. After the fitting is made to pass through and then rotated by 90 °, the arcuate convex portion 38 enters the groove 50 and is caught by the catching portion 48, so that both cannot be taken out.

In other words, the terminal body 18 is mounted on the joint body 12. In this state, the O-ring 32 attached to the outer circumference of the sleeve 30 and the auxiliary O-ring 34 attached to the groove of the outer circumference of the tip portion of the cylindrical portion 36 are closely connected to the inner surface of the terminal cylinder 18. do. In addition, the mounting structure of the terminal cylinder 18 to the joint body 12 is not limited to the above structure, For example, the mounting structure by torsion may be sufficient.

3 shows a state in which the pipe 10 is connected to the pipe joint of the above configuration. That is, when the tube 10 is inserted into the tube joint of FIG. 1, the tip portion of the tube 10 first enters the sleeve 30 and strikes the protruding frame 40. When the tube 10 is inserted, the sleeve 30 is pushed by the tube 10 and pushed into the cylindrical portion 36 of the joint body 12.

On the other hand, since the O-ring 32 cannot move in contact with the end face of the cylindrical portion 36 (functioning as the O-ring retraction stop Z), the entire length of the sleeve 30 is cylindrical. When pushed in, it is elastically restored so that its cross-sectional area is enlarged as shown in FIG. 3, except from the sleeve 30, so as to be in close contact with the outer circumference of the tube 10.

The size of the O-ring 32 is set to be close to both the outer circumferential surface of the tube 10 and the inner circumferential surface of the terminal cylinder 18 in this state. Therefore, the water penetrating from between the tube 10 and the terminal cylinder 18 is blocked by the O-ring 32, and the water penetrating from between the terminal cylinder 18 and the joint body 12 is made into the auxiliary O-ring ( 34), the watertightness is ensured.

Moreover, the inner part of the joint body 12 is provided with the end part 52 which the edge part of the sleeve 30 collides with, and when the front end of the sleeve 30 collides with the edge part 52, The abnormal pipe 10 cannot be inserted.

In addition, when trying to pull out the tube 10 from the state of FIG. 3, the O-ring 32 moves slightly with the tube 10, but finally, the outer peripheral surface of the tube 10 and the taper surface of the terminal cylinder 18 are carried out. The tube 10 can no longer be pulled out because it is interposed between (28) and can no longer move.

As described above, according to the tube joint according to the first aspect of the present invention shown in Fig. 1, since the sleeve 30 for holding the ring 32 in a diameter-expanded state is provided, only the tube 10 is inserted. The pipe 10 can be connected simply. In addition, since the O-ring 32 is enlarged by the sleeve 30, there is an advantage that the allowable range for the outer diameter change of the pipe is wide.

In the pipe joint of this embodiment, the spiral cylindrical tube is twisted into the corrugated cylindrical portion 20 to be connected. However, the structure of the tubular joint can be appropriately changed depending on the purpose.

Embodiment 2

4A-4C, 5A, 5B, 6A, 6B, 7A-7E, 8 and 8B show a joint according to another embodiment of the present invention.

4A to 4C show the procedure for connecting the tube 10 by the tube joint of this embodiment, and FIGS. 5A and 5B show the joint body 12 constituting this tube joint, FIGS. 6A, 6B and 7A to 7E likewise show the terminal cylinder 18 and FIGS. 8A and 8B show the sleeve 30. In Figs. 4A to 8B, the same reference numerals are given to portions substantially the same as Figs.

The conduit joint of this embodiment differs from that of the first embodiment in that the terminal cylinder 18 has a space S that allows the O-ring 32 to roll or slide between the sleeve 30. will be. The O-ring 32 is the position shown in FIG. 4A before the tube is inserted, that is, the position approaching toward the tapered surface 28 of the cylindrical portion 42 of the terminal cylinder 18 (end surface of the joint body 12). Position away from Z). In this position, the O-ring 32 is enlarged in diameter by the sleeve 30 and is in close contact with the inner surface of the cylindrical portion 42.

When the tube 10 is inserted into such a tube joint, the O-ring 32 is rolled and moved in the direction of the arrow by the movement of the sleeve 30 as shown in Fig. 4A. The tube 10 can be inserted, thereby facilitating the connection work.

When the tube 10 is inserted to the end, as shown in Fig. 4B, the same connection state as in the first embodiment can be obtained. When a force to be pulled out of the tube 10 is applied, as shown in Fig. 4C, the O-ring 32 rolls in the opposite direction due to the movement of the tube 10, and returns to the same position as in Fig. 4A. When the abnormal pipe 10 is to be pulled out, the O-ring 32 is sandwiched between the outer circumferential surface of the pipe 10 and the tapered surface 28 of the terminal cylindrical body 18 and thus cannot be pulled out.

In this way, when the pulling force is applied to the pipe 10, the pulling force applied to the pipe 10 is alleviated by allowing the movement of the pipe 10 until the O-ring 32 reaches the tapered surface 28. This can prevent damage to the pipe joint. In particular, when the pipe joint is used to connect a pipe buried in the ground, there is an advantage that the pipe displacement due to an earthquake or ground subsidence can be absorbed.

In this embodiment, the raised portion 54 is formed in the middle of the range W in which the O-ring 32 rolls on the inner circumferential surface of the terminal cylinder 18. In this example, the ridge 54 is formed in a circular cross section. If the raised portion 54 is formed, the rolling of the O-ring 32 is restricted, so that the sleeve 30 can be prevented from moving by the rolling movement of the ring 32 before the pipe is inserted. In the process of inserting the tube 10, the pushing force increases when the ring 32 passes through the raised portion 54, and the pushing force decreases thereafter, so that the pressure of the tube 10 decreases. There is an advantage such that the operator can detect whether the push is being performed properly.

In addition, in this embodiment, since the ridge part 54 is formed, there is an advantage that the sleeve 30 can be smoothly put inside the ring 32 when assembling the pipe joint. That is, as shown in FIG. 9A, after setting the ring 32 at the position of one end (joint main body 12 side) from the raised part 54 in the terminal cylinder 18, the terminal body 18 When the sleeve 30 is inserted from one end of the joint body (the joint body 12 side), the ring 32 may be pushed by the sleeve 30 to move toward the ridge 54, but the ring 32 The silver rotates when it reaches the raised portion 54, passes over the raised portion 54, and guides the sleeve 30 into the ring 32. As a result, as shown in Fig. 9B, it is possible to obtain an appropriate assembled state in which the ring 32 is mounted on the outer surface of the sleeve 30.

Since the structure of that excepting the above is substantially the same as Embodiment 1, description is abbreviate | omitted.

Example 3

10 and 11 show a tube joint according to still another embodiment of the present invention. 10 shows the state before inserting the tube 10, and FIG. 11 shows the state which inserted the tube 10, respectively.

The pipe joint is an end portion of the cylindrical body 36 of the joint body 12 in the first embodiment, and a joint body 12 of the cylindrical portion 42 of the terminal cylinder 18. The end part of the 1) side is formed integrally, and the joint body 12 and the terminal cylinder 18 are integrated. The other structure is the same as that of Embodiment 1 shown in FIGS. 1-3, and the same code | symbol is attached | subjected to the same part.

Although the tube joint of such a structure has the advantage that the number of parts is minimized, there is a difficulty in that the tube 10 once connected cannot be removed.

Embodiment 4

12-15 show the tube joint which concerns on another embodiment of this invention.

12-15, the same code | symbol is attached | subjected to the same part as FIG.

The pipe joint of this embodiment is different from that of Embodiment 1, as shown in FIG. 12, on the outer circumference of the sleeve 30, the main ring 32 for preventing the chipping out and the auxiliary for watertightness maintenance. The ring 34 is maintained in a diameter-expanded state, and is supported by the annular plate 56 via an annular plate 56 between the main ring 32 and the auxiliary ring 34. The ring 34 is pushed against the end face of the joint body 12.

That is, the auxiliary o-ring 34 is compressed by the annular plate 56 on the diameter expanded by the sleeve 30. The annular case 56 is held in the position which compresses the auxiliary | ring ring 34 by the edge part formed in the middle part of the inner surface of the terminal cylinder 18. As shown in FIG. In addition, in this embodiment, the annular plate 56 is a ring receding stop portion Z. As shown in FIG.

FIG. 13 shows a state in which the tube 10 is inserted into the tube joint of FIG. 12 and the tip of the tube 10 hits the doltoolte 40 of the sleeve 30. After the tube 10 is pushed to the end as shown in FIG. That is, the sleeve 30 is pushed into the terminal cylinder 36 of the joint body 12, and the main ring 32 and the auxiliary ring 34, which are removed from the sleeve 30, tighten the tube 10. do. In this state, the auxiliary ring 34 is close to the end face of the joint body 12 and the outer circumferential surface of the pipe 10, so that watertightness is maintained.

When the inserted tube 10 is to be removed, as shown in FIG. 15, the main ring 32 is disposed between the outer peripheral surface of the tube 10 and the tapered surface 28 of the terminal cylinder 18. It will be stuck and won't be pulled out

Since the structure of that excepting the above is substantially the same as Embodiment 1, description is abbreviate | omitted.

Embodiment 5

Fig. 16 shows a conduit joint according to still another embodiment of the present invention. In the above embodiments 1 to 4, the tube joint connecting the spiral wave tube to one end of the joint body 12 and the straight tube to the other end is shown, but the tube joint of this embodiment is connected to both ends of the joint body 12. The straight pipes 10 are connected to each other in a symmetrical structure. Since the other structure is the same as the joint joint of embodiment (2) shown to FIG. 4A-FIG. 8B, the same code | symbol is attached | subjected to the same part and description is abbreviate | omitted.

Embodiment 6

Fig. 17 shows a conduit joint according to still another embodiment of the present invention. In the first to sixth embodiments, the sleeve 30 is provided with a protruding frame 40 in which the end portion of the tube abuts on the inside, but the tube joint of this embodiment has an outer diameter of the tube 10. The straight sleeve 30 is the same as or larger than the outer diameter and smaller than the outer diameter of the tube 10.

In the case of the tube joint, when the tube 10 is inserted, the end face of the tube 10 abuts against the end face of the sleeve 30 to push in the sleeve 30. Since the other structure is the same as the joint joint of Embodiment 1 shown in FIGS. 1-3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

Example 7

Fig. 18 shows another example of the sleeve used for the pipe joint of the present invention. 8A and 8B, the sleeve 30 differs from the protruding frame 40 by forming a tapered shaped enlarged portion 60 (stopper portion) whose inner and outer diameters are larger by the outer edge. It is.

In this enlarged diameter portion 60, a plurality of slits 61 are formed in the axial direction from the outer end, whereby the enlarged diameter portion 60 is divided into a plurality of small pieces. The sleeve 30 is formed of a synthetic resin having spring elasticity, and the outer diameter of the outer end of the enlarged diameter portion 60 is set larger than the inner diameter of the cylindrical portion 36 of the joint body 12, thereby expanding the diameter. The outer end of the portion 60 is in strong contact with the inner surface of the cylindrical portion 36. In addition, it is preferable that the width (axial dimension) of the enlarged diameter portion 60 is set to about 5 mm and the inclination is about 5 degrees with respect to the central axis of the sleeve 30.

In the tube joint using the sleeve 30, when the sleeve 30 tries to move deeply in the state before the tube insertion shown in Fig. 19, the enlarged diameter portion 60 touches the ○ ring 32, It can be prevented from entering deeply, thereby preventing inconvenience that the pipe joint cannot be used without preparation.

When the tube 10 is inserted, the sleeve 30 is moved inward by being pushed by the tube 10. At this time, the tip portion divided into a plurality of small pieces of the enlarged diameter portion 60 of the sleeve 30 elastically deforms inward and passes through the inside of the ring 32.

In addition, after the pipe connection, as shown in FIG. 20, since the enlarged diameter part 60 of the sleeve 30 is in strong contact with the inner surface of the joint body 12, the force pulled out to the pipe 10 is applied, and the pipe ( Even if 10 moves, the sleeve 30 can be prevented from being pulled out together with the tube 10. That is, it is possible to prevent the sleeve 30 from entering the ○ ring 32 and damaging the close state of the ○ ring 32 to the tube 10, causing the tube to fall out. Therefore, this pipe joint can connect the pipe 10 more reliably.

Embodiment 8

21 and 22 show a conduit joint according to still another embodiment of the present invention. 21 is a state before insertion and FIG. 22 is a state after insertion. In FIG. 21 and FIG. 22, the same code | symbol is attached | subjected to the substantially same part as FIG.

The pipe joint of this embodiment differs from that of the first embodiment in the axial middle portion of the outer circumference of the sleeve 30 at intervals in the circumferential direction (for example, 90 ° intervals, 120 ° intervals, or 180 °). A plurality of projections 64 (stoppers) are formed at the intervals, and a groove 66 in the circumferential direction in which the projections 64 enter is formed on the inner surface of the joint body 12.

The projection 64 is located outside the cylindrical portion 36 of the joint body 12 before insertion of the tube, as shown in FIG. 21. When the tube 10 is inserted to the end as shown in FIG. It passes through the grooves 12 of the joint body 12 and is caught by the edges thereof to prevent the sleeve 30 from escaping from the joint body 12.

Therefore, with such a structure as well, in the same way as in the seventh embodiment, it is possible to prevent the pipes from being removed by the movement of the sleeve 30. In addition, in this embodiment, when the projection 64 passes through the cylindrical portion 36, the sleeve 30 elastically deforms in the gap between the cylindrical portion 30 and the tube 10.

Embodiment 9

23 and 24 show a conduit joint according to still another embodiment of the present invention. FIG. 23 is a state before insertion and FIG. 24 is a state after insertion.

The conduit joint of this embodiment differs from that of Embodiment 1 (FIGS. 1 to 3) in that the portion preventing the omission of the ring 32 of the terminal cylinder 18 is not a taper cylinder portion. It is comprised by the inward annular projection frame 68. As shown in FIG.

With this configuration, the length of the pipe joint can be made shorter than that of the first embodiment. However, when the pipe 10 is pulled out after the pipe 10 is connected, the ring 32 inwards. Since it only hits the annular protruding frame 60, the withdrawal resistance of the tube 10 becomes smaller than that of the first embodiment. Therefore, in this embodiment, as shown in the figure, the C-shaped ring 69 made of a metal sheet is placed in front of the ring 32, and configured to be fed into the inserted tube, so that the extraction resistance is obtained. Supplemented. Since other configurations are substantially the same as those in Figs. 1 and 3, the same reference numerals are given to substantially the same parts.

Embodiment 10

25A to 27C show a tube joint according to still another embodiment of the present invention. 25A and 25B show a sleeve 30 used in this embodiment and a ring 32 held in the expanded state on the outer circumference thereof. Similarly to Embodiment 8 (FIG. 21), the sleeve 30 is provided with a plurality of projections 64 (stopper portions) on the outer circumference.

26A and 26B show half of one side of the two-part joint body 12 used in this embodiment. The other half is also omitted, but the same shape. In this embodiment, the terminal cylinder 18 is integrally formed at both ends of the joint body 12. The joint body 12 and the terminal cylinder 18 are semi-cylindrical continuous bodies, and plate portions 70 for coupling with the opposite half at both edges are integrally formed, and bolt holes 72 are formed therein. Formed.

The inner surface of the joint body 12 is formed with a semicircular recess 74 in which the sleeve 30 is slidably fitted, and the central portion of the recess 74 in the axial direction is provided with a protrusion in the circumferential direction ( 76) is formed. This protrusion 76 is a part which the sleeve 30 pushed in by the insertion of a pipe | tube hits.

Moreover, the semicircular recessed part 78 which accommodates the ring 32 is formed in the inner surface of the terminal cylinder 18. As shown in FIG. The outer end of the recess 78 is a tapered surface 28 whose inner diameter decreases toward the outer end.

27A to 27C show a method of assembling a pipe joint using the parts of FIGS. 25A to 26B.

First, as shown in FIG. 27A, the sleeve 32 with the ring 32 attached to one half of one side of the two-part joint body 12 is assembled. Then, as in Fig. 27B. Next, the other half of the joint main body 12 is covered with this as shown in FIG. 27, and the plate part 70 is tightened with the bolt nut 80, and the pipe joint 82 is completed.

This pipe joint 82 can also be connected to the pipe 10 by simply inserting the pipe 10 from both ends.

Since the joint body 12 which has the terminal cylinder 18 at both ends can be divided in the plane containing a center axis | shaft, this pipe joint 82 is easy to disassemble after pipe connection. Therefore, it is suitable for the use which needs to release connection state after carrying out necessary work by temporarily connecting a pipe | tube.

An example of such a use will be described with reference to FIGS. 28A and 28B.

If there is a handhole (or manhole) in the middle of the underground installation route of the conduit, in the handhole, the upstream conduit and the downstream conduit are discontinuous. In the case of carrying out long cable runs continuously to such a discontinuous conduit, the cable run is performed while the upstream conduit and the downstream conduit are connected by a relay tube, and then the relay is carried out. The tube is cut off on both sides to remove it (because the cable cannot be cut).

At this time, it is desired that the tube joint connecting the conduit and the relay tube can easily connect the conduit and the relay tube, and can easily release the connection state between the conduit and the relay tube after the cable connection.

FIG. 28A shows the conduit 10a and the relay 10b after connecting the conduit 10a and the relay 10b by a tube joint assembled as shown in FIG. 27C, and routing the cable 84 in that state. In order to release the connection, half of one side of the joint main body 12 is shown. Since the joint body 12 can be divided into two parts, it can be easily separated as mentioned above.

If the pair of joint bodies 12 are separated and the sleeve 30 and the ring 32 are cut off and removed, the connection between the conduit 10a and the relay 10b can be released as shown in Fig. 28B. . Subsequently, if the relay pipe 10b is cut off and removed, a target cable laying state (a laying state where the cable is exposed in the hand hole) can be obtained.

As explained above, since the pipe joint which concerns on this invention enlarges a ring by a sleeve, a pipe can be connected simply by inserting a pipe, without processing to the end of a pipe. In addition, since the dimensional change in the radial direction of the ring can be largely caught, it can cope with many kinds of pipes having different outer diameters.

Claims (13)

As a pipe joint connecting the pipe, The cylindrical joint body, A sleeve having a contact portion slidably fitted so that a part of the joint body protrudes out of the joint body, and abutting the end face of the tube; A ring having elasticity, which is held in an enlarged state on the outer periphery of the portion protruding out of the joint body of the sleeve, One end is mounted on the outer periphery of the other end of the joint body, and has a terminal body having the accommodating portion of the (circle) ring at the middle portion, and a preventing portion of the o ring falling at the other end portion, When the tube is inserted from the opening of the terminal cylinder, the sleeve is pushed into the joint body at the portion where the sleeve abuts, and is pushed into the joint body, whereby the ○ ring is pulled out of the sleeve and reduced in diameter, so as to be close to the outer circumference of the tube. A tube joint, characterized in that configured to. The pipe joint according to claim 1, wherein one end of the terminal body is integrally formed with the other end of the joint body. The pipe joint according to claim 1 or 2, wherein the ring release preventing portion of the terminal cylinder is a tapered surface whose inner diameter decreases toward the end portion thereof. The ring according to any one of claims 1 to 3, wherein the ring held in the mirrored state on the outer circumference of the sleeve is in close contact with the inner circumferential surface of the terminal cylinder, and the terminal cylinder is between the sleeve and the sleeve. A conduit joint, characterized in that it has a space that allows the ring to move in the insertion direction of the conduit. The pipe joint according to claim 4, wherein a raised portion is formed in the middle of the moving range of the O-ring on the inner circumferential surface of the terminal cylinder. 6. The sleeve according to any one of claims 1 to 5, wherein the sleeve engages with an inner surface of the joint body when the sleeve is pushed into the joint body by insertion of the tube, and the sleeve engages the joint. A pipe joint, comprising: a stopper portion for preventing it from escaping from the main body. The pipe joint according to claim 2, wherein the joint body and the terminal cylinder formed integrally with the other end thereof are split in a plane including a central axis. The groove is formed in the outer periphery of the other end part of the said joint main body, The auxiliary ring is attached to this groove, The said auxiliary ring is the said terminal body of any one of Claims 1-7. Pipe joint, characterized in that the watertightness is maintained in close contact with the inner surface of the. 8. The ring-shaped plate according to any one of claims 1 to 7, wherein an auxiliary ring is maintained in an enlarged diameter state on an outer circumference of the sleeve, and an annular plate is disposed between the ring and the ring. Pipe joints. 10. The pipe joint according to any one of claims 1 to 9, wherein the abutting portion of the sleeve is a shaft portion formed at an end portion of the slip that is fitted to the joint body. The pipe joint according to any one of claims 1 to 9, wherein an abutting portion of the sleeve is an end surface of the sleeve protruding out from the joint body. The said contact part of the said sleeve is a processus | protrusion formed in the outer peripheral surface of the said sleeve, The recessed part which receives the said processus | protrusion is formed in the inner surface of the said joint main body, The manufacturing method of any one of Claims 1-9 characterized by the above-mentioned. Pipe joints. The pipe according to any one of claims 1 to 10 and 12, wherein an enlarged diameter portion having a plurality of slits is formed at an end portion of the sleeve that protrudes out from the joint body. Joint.