JPH0534390U - Corrugated pipe insertion type pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe joint for a corrugated pipe, which enables the corrugated pipe 1 to be connected with one touch, and thus shortens the connection work. [Structure] The stop ring 4 is provided in the groove 11 of the joint body 10.
0, the retainer 20 having the concave groove 21 that engages with the stop ring is provided, the packing 42 is mounted on the inner side of the ridge 13 of the joint body, and the inlet side coil cover 30 is installed on the inner side of the packing. The inner side coil cover 35 is attached to the outer side of the inlet side coil cover, and the inner side coil cover and the inlet side coil cover are connected by an engaging groove and an engaging protrusion to the outer peripheral surface of one coil cover. The protrusion of the provided protrusion to the large diameter side is restricted by the inner surface 16 on the inlet side of the locking groove 15 of the joint body, and the protrusion is provided between the collar 32 of the inlet side coil cover and the collar 37 of the inner side coil cover. The coil spring 46 is interposed in a compressed state, and the outer coil spring 48 is provided between the collar 37 of the inner coil cover and the inner side surface 17 of the joint body.
Is interposed in a compressed state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for a corrugated pipe whose outer surface is corrugated.

[0002]

[Prior Art]

 As a pipe joint for a corrugated pipe, for example, there is one disclosed in Japanese Patent Laid-Open No. 61-6491. This is a pipe joint that has a joint body, a cap nut, and a sleeve whose inner surface is corrugated.To connect a corrugated pipe using this pipe joint, first insert the cap nut into the corrugated pipe and Open the notch on the circumference, project about 1 to 5 crests at the tip of the corrugated pipe, fit the sleeve to the corrugation of the corrugated pipe, and then insert the sleeve into the joint body. After that, when the cap nut is screwed into the male thread of the joint body and tightened, the sleeve is reduced in diameter by the inner diameter tapered surface of the joint body and advances to the inside of the joint body while holding the corrugated pipe, and the tip of the corrugated pipe is Is the one that abuts on the pipe receiving wall formed in the inner part of the joint body, and the protruding portion at the tip of the sleeve is crimped between the sleeve and the pipe receiving wall to maintain the sealing property.

Another pipe joint for corrugated pipes is disclosed in Japanese Utility Model Laid-Open No. 1-75691. This one has a tubular body, a zipper having an inner corrugated surface that engages with the outer corrugated surface of the corrugated tube, and is divided into three or more parts in the axial direction. And a sleeve having a sleeve. When connecting the corrugated pipe, first expand the chuck, insert the corrugated pipe, and move the sleeve to the rear end side, so that the chuck fits into the chuck narrowing portion of the tubular body and narrows in the centripetal direction. The inner surface of the chuck, which is similar to the outer surface of the corrugated tube, engages and crimps the outer surface of the corrugated tube to hold the corrugated tube. Further, the corrugated tube held by the chuck moves in the same direction as the sleeve, and its tip is crimped and connected to the metal seal portion provided inside the cylindrical main body.

[0004]

Among the above conventional pipe joints, the one disclosed in Japanese Patent Laid-Open No. 61-6491 discloses that a cap nut is inserted into a corrugated pipe, a sleeve is attached to the corrugated pipe, and a corrugated pipe is mounted. It was necessary to insert the sleeve holding the sleeve into the joint body, tighten the cap nut, and perform various other tasks, which meant that workability was not always satisfactory. Similarly, the work disclosed in Japanese Utility Model Laid-Open No. 1-75691 was not always good in workability. Therefore, an object of the present invention is to provide a pipe joint for a corrugated pipe with improved workability.

[0005]

[Means for Solving the Problems]

 The present invention is directed to a joint body in which a concave groove, a ridge, and a locking groove are formed in this order from the inlet side of the inner peripheral surface to the inner side, and the joint body is mounted in the concave groove to expand and contract in the radial direction. A retainer that has a possible stop ring and an inner surface shape that engages with the outer surface shape of the corrugated pipe to be connected, has a groove that engages with the stop ring on the outer peripheral surface, and has a slit in the axial direction. A packing attached to the inner side of the ridge of the joint body, an inlet side coil cover having an engaging groove or engaging protrusion on the outer surface, and a flange for pressing the packing inwardly of the inlet side, It is mounted on the outside of the inlet side coil cover and has an engaging protrusion or an engaging groove that fits with an engaging groove or an engaging protrusion of the inlet side coil cover, and the front side of the corrugated pipe is on the inner side on the back side. Outer surface of the back side coil cover and the back side coil cover with protruding flanges to engage A projection that is formed and whose protrusion toward the large diameter side is restricted by the inner surface of the joint body on the inlet side of the locking groove, and the flanges on the inlet side coil cover and the rear side coil cover are in a compressed state. The above object is achieved by the corrugated pipe plug-in type pipe joint having the inner coil spring interposed in.

However, instead of the inlet side coil cover and the inner side coil cover, an engaging groove or an engaging protrusion is provided on the outer surface, and a collar that engages with the front surface of the corrugated pipe is protruded inwardly on the inner side. The rear side coil cover is provided, and the inner side is provided with an engaging protrusion or an engaging groove that is fitted on the outer side of the rear side coil cover and that engages with the engaging groove or the engaging protrusion of the rear side coil cover. An inlet side coil cover that projects a collar that presses the packing inward and an outside surface of the inlet side coil cover, and a protrusion toward the large diameter side is formed on the inside surface of the joint body that is closer to the inlet side than the locking groove. It is also possible to use a projection portion regulated by. Also, an outer coil spring may be interposed in a compressed state between the collar of the inner coil cover and the end surface of the joint body.

[0007]

[Action]

 Since the invention of the present application has the above-described structure, the inner coil springs interposed between the coil covers are trying to separate the coil covers from each other in the axial direction. At the same time as the protrusions fit together and press in the axial direction, one of the coil covers is installed in a reduced diameter state, and the protrusion presses the peripheral surface on the small diameter side in the radial direction, resulting in a large protrusion. It is about to project to the radial side, and this projection is restricted by the inner surface on the inlet side of the locking groove of the joint body. Therefore, both coil covers and the inner coil spring are free in the axial direction. Here, by interposing an outer coil spring between the inner coil cover and the inner end surface of the joint body, both coil covers and the inner coil spring can be surely kept in the state of being moved to the inlet side. ..

Then, the slit of the retainer is opened, the tip of the corrugated pipe to be connected is projected, the retainer is fitted to the wave peak of the corrugated pipe, and the retainer holding the corrugated pipe is inserted into the main body of the joint. The stop ring expands its diameter to allow the retainer to enter, and reaches the concave groove on the outer surface of the retainer to reduce its diameter and lock the retainer at that position. On the other hand, the front surface of the corrugated pipe pushes the flange of the back side coil cover against the outer coil spring, so that the coil cover part moves to the back side as a whole, and the protrusions lock the joint body. When reaching the groove, the protrusion protrudes toward the large diameter side, and the inner coil spring separates the coil covers from each other in the axial direction so that the inlet side coil cover presses the packing and the packing passes through the inlet side coil cover. The inner coil spring constantly presses and swells in the radial direction to constantly seal between the outer surface of the ridge of the corrugated pipe and the inner surface of the joint body.

At that time, when the inlet-side inner wall surface of the recessed groove of the joint body is formed by reducing the diameter toward the inlet side, if the corrugated pipe is pulled out after the connection, the retainer and the stop rig are also pulled out. Although the stopper moves in the direction, the stop ring receives a diameter reducing action by the diameter reducing surface of the concave groove and strongly grips the retainer, so that the pullout preventing force is exerted more reliably. When the inner side wall surface of the ridge of the joint body is reduced in diameter toward the inlet side, the packing swells due to the pressing force of the inner coil spring, and the diameter decreases when the joint body moves toward the inlet side. Therefore, the outer surface of the corrugated pipe and the inner surface of the joint body are more reliably sealed.

[0010]

【Example】

 An execution example of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a lower half of an upper half section showing a corrugated pipe according to an embodiment of the present invention before connection, and FIG. 3 shows a corrugated pipe after connection of the same embodiment. The corrugated pipe plug-in type pipe joint of this embodiment includes a joint body 10, a joint member 17, an O ring 18, a retainer 20, an inlet side coil cover 30, a back side coil cover 35, and a stop ring 40. A packing 42, a protrusion 44, an inner coil spring 46, and an outer coil spring 48.

First, the joint body 10 is formed in a hexagonal cylindrical shape, and has a concave groove 11 in the circumferential direction and a convex strip 13 in the circumferential direction from the inlet side (right side in the drawing) of the inner peripheral surface toward the rear side (left side in the drawing). , A circumferential engaging groove 15 is formed in that order. The inner wall surface on the inlet side of the concave groove 11 is formed as an inclined surface 12 whose diameter is reduced toward the inlet side. In this embodiment, the inclination angle of the inclined surface 12 is 45 °. The inner side wall surface of the ridge 13 is also formed as an inclined surface 14 whose diameter decreases toward the inlet side. An inlet side of the locking groove 15 is formed on the inner peripheral surface 16 of the cylinder, and a joint member 17 having a tapered male screw for a pipe is formed on the side opposite to the inlet side of the joint body 10 via an O-ring 18. It is screwed with a sealing property. Although the joint member 17 is a separate body for facilitating the assembly, it is not always necessary to form a separate body, and the joint body 10 may be integrally formed.

The stop ring 40 is formed by a so-called garter coil that is formed by forming a metal coil in an annular shape, that is, by forming a metal wire around an outer circumference of a donut and is configured to be expandable and contractible. It is mounted in the groove 11 of the main body. However, the stop ring 40 may be a known retaining mechanism other than a disc spring shape or the like.

A concave groove 21 into which the stop ring 40 is fitted is formed on the outer peripheral surface of the retainer 20, and the outer peripheral surface of the front end (left end in the drawing) of the retainer 20 is a tapered surface 22 whose diameter decreases toward the front end side. Is formed in. On the other hand, the inner peripheral surface of the retainer 20 is formed as a corrugated inner surface 23 that engages with the corrugated outer surface of the corrugated tube 1. Further, as shown in FIG. 2, the retainer 20 is configured so that it can be opened in the axial direction by a slit 24 in the axial direction. That is, the slit 24 can be provided at two or more places so that the slit 24 can be completely divided into two or can be divided into multiple parts, or as shown in FIG. For example, a thin portion 25 may be provided at a portion separated by 180 ° so that it can be opened in the axial direction. The packing 42 is made of rubber, has an inner diameter substantially equal to the outer diameter of the peak portion of the corrugated outer surface of the corrugated pipe 1 to be connected, and is mounted on the inner side of the ridge 13 of the joint body.

The inlet side coil cover 30 is formed in a cylindrical shape as a whole, and a concave groove portion 31 for engagement is formed on the outer circumferential surface thereof. A collar 32 protruding inward is formed on the inlet side of the inlet side coil cover 30, and an inlet side end surface of the collar 32 is in contact with a back side end surface of the packing 42. The back side coil cover 35 is also formed as a whole in a cylindrical shape and is attached to the outside of the inlet side coil cover 30, and has a protrusion 36 formed in the inner circumferential direction to engage with the concave groove 31 of the inlet side coil cover. There is. A collar 37 protruding inward is formed on the inner side of the inner coil cover 35, and the collar 37 has an inner diameter capable of engaging with the front surface of the corrugated tube 1.

The protrusion 44 formed on the outer peripheral surface of the inner coil cover is restricted from protruding toward the large diameter side by the cylindrical inner peripheral surface 16 on the inlet side of the locking groove 15 of the joint body. Further, an inner coil spring 46 is interposed in a compressed state between the collars 32 and 37 of the inlet side coil cover and the inner side coil cover, and the collar 37 of the inner side coil cover and the inlet side of the joint member 17 are provided. An outer coil spring 48 is interposed between the end surface and the end surface in a compressed state. The outer coil spring 48 holds both of the coil covers 30 and 35 and the inner coil spring 46 in a state of being moved toward the inlet side, and may be relatively weak. It may not be provided depending on the case. On the other hand, since the inner coil spring 46 presses the packing 42 to swell it, a relatively strong one is used.

The present embodiment is configured as described above, and the inner coil springs 46 interposed between the coil covers 30 and 35 attempt to separate the coil covers 30 and 35 from each other in the axial direction. Also, since the coil cover is mounted in a reduced diameter state, the protrusion 44 provided on the back side coil cover is about to protrude toward the large diameter side, and this protrusion is inside the cylinder on the inlet side of the locking groove of the joint body. It is regulated by the peripheral surface 16. Therefore, the coil covers 30 and 35 and the inner coil spring 46 are in a free state in the axial direction, and as a result, they are prevented by the outer coil spring 48 interposed between the inner coil cover 35 and the joint member 17. , As a whole, it keeps moving to the entrance side.

Then, the resin coating portion 2 covering the corrugated pipe 1 is removed by a certain length, the notch 24 of the retainer 20 is opened, and the tip of the corrugated pipe 1 is projected to fit the retainer 20 to the wave peak of the corrugated pipe 1. When the retainer 20 holding the corrugated pipe 1 is inserted into the joint body 10, the stop ring 40 gradually expands in diameter by the tapered surface 22 on the outer surface of the retainer to allow the retainer 20 to enter, and the outer surface of the retainer 20 to be inserted. The diameter is reduced to reach the groove 21, and the retainer 20 is locked at that position as shown in FIG.

On the other hand, the front surface of the corrugated tube 1 pushes the flange 37 of the inner coil cover toward the inner side against the outer coil spring 48, so that the coil covers 30, 35 and the inner coil spring 46 as a whole are arranged in the inner portion. When the projection 44 moves to the side and reaches the locking groove 15 of the joint body, the projection 44 projects to the large diameter side, and the inner coil springs 46 separate the coil covers 30 and 35 from each other in the axial direction. The inlet side coil cover 30 presses the packing 42, and the packing 42 is constantly pressed by the inner coil spring 46 via the inlet side coil cover 30 and bulges in the radial direction, and the outer surface of the corrugated pipe 1 and the joint body. Always seal with the inner surface of 10.

Further, in this embodiment, since the inlet side inner wall surface of the concave groove 11 of the joint body is formed as the inclined surface 12, when the corrugated pipe 1 is pulled out after the connection, the retainer 20 and the stop ring 40 are also pulled out. Although the stopper ring 40 moves in the direction, the stopper ring 40 receives the diameter reduction effect of the inclined surface 12 of the concave groove and strongly grips the retainer 20, so that the pullout preventing force is exerted more reliably. On the other hand, when the inclined surface 12 is not formed, it is preferable to form the recessed groove 21 of the retainer at least deeper than the winding radius of the stop ring 40 in order to secure a blocking force against pulling out.

Further, in this embodiment, since the inner side wall surface of the ridge of the joint body is also formed on the inclined surface 14, the packing 42 swells when pressed by the inner coil spring 46, and the inlet side of the joint body 10 When the slanted surface 14 is moved, the slanted surface 14 reduces the diameter of the corrugated tube 1 so that the outer surface of the corrugated tube 1 and the inner surface of the joint body 10 are more reliably sealed.

In the above embodiment, the back side coil cover 35 is mounted on the outside of the entrance side coil cover 30, but as another embodiment, the entrance side coil cover is mounted on the outside of the back side coil cover, and Even with such a configuration, it is possible to obtain the same operation and effect as in the above embodiment. The stop ring 40 must allow the retainer 20 to enter and prevent the retainer 20 from pulling out. For that purpose, the inlet of the groove 11 of the joint body is required. Either the side inner wall surface is formed on the inclined surface 12, the front end outer peripheral surface of the retainer is formed on the tapered surface 22, or the stop ring 40 itself is formed in a disc spring shape as shown in FIG. 4, for example. You can use or.

In the above embodiment, a garter coil in which a metal coil is formed in an annular shape is used as the stop ring 40. However, since the inclined surface 12 is formed in the joint body, the tapered surface 22 of the retainer is not always necessary. Not necessary. Further, when the disc spring-shaped stop ring 40 shown in FIG. 4 is used, it is not always necessary to provide the inclined surface 12 of the joint body and the tapered surface 22 of the retainer.

[0023]

[Effect of the device]

 The present invention provides a pipe joint for a corrugated pipe, which allows one-touch connection of the corrugated pipe, and therefore requires no skill and shortens the connecting work.

[Brief description of drawings]

FIG. 1 is a front view of a lower half of an upper half section showing a pipe before connection according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line A- in FIG.
Section A

FIG. 3 is an upper half cross-sectional view of an essential part showing a completed connection of the embodiment.

FIG. 4 is a perspective view showing another embodiment of the stop ring.

[Explanation of symbols]

1 ... Corrugated tube 2 ... Resin cover
10 ... Joint body 11 ... Recessed groove 12 ... Sloping surface
13 ... ridge 14 ... inclined surface 15 ... locking groove
16 ... Cylindrical inner peripheral surface 17 ... Joint member 18 ... O-ring 20 ... Retainer 21 ... Recessed groove
22 ... tapered surface 23 ... corrugated inner surface 24 ... cutting
25 ... Thin portion 30 ... Inlet side coil cover 31 ... Recessed groove
32 ... Tsuba 35 ... Back side coil cover 36 ... Protrusion
37 ... Tsuba 40 ... Stop ring 42 ... Packing
44 ... Projection 46 ... Inner coil spring 48 ... Outer coil spring

Continued Front Page (72) Hideo Nozaki, Creator Hideo Nozaki, Daifuku, No.2, Daifuku, Kuwana City, Mie Prefecture Inside the Kuwana Plant of Hitachi Metals Ltd.

Claims (2)

[Scope of utility model registration request] 1. A concave groove extending from the inlet side of the inner peripheral surface toward the back,
A joint main body in which a ridge and a locking groove are formed in that order, a stop ring that is mounted in the concave groove of the joint main body and is expandable and contractible in the radial direction, and engages with the outer surface shape of the corrugated pipe to be connected. A retainer that has an inner surface shape, has a groove on the outer peripheral surface that engages with the stop ring, and is provided with slits in the axial direction; a packing that is attached to the inner side of the ridge of the joint body; and an outer surface or an inner surface. An inlet side coil cover having an engaging groove or an engaging protrusion on the inlet side, and a flange that presses the packing inwardly of the inlet side, and an inlet side coil cover that is fitted to the outside or inside of the inlet side coil cover. An inner side coil cover and an outer side having engaging protrusions or engaging grooves that engage with the engaging grooves or engaging protrusions of the coil cover, and projecting a collar that engages with the front surface of the corrugated tube on the inner side on the inner side. Formed on the outer surface of one of the coil covers located at The inner surface of the joint body on the inlet side of the locking groove restricts the protrusion toward the large diameter side, and the flange between the inlet side coil cover and the rear side coil cover is compressed. Corrugated pipe insertion type pipe joint having an inner coil spring interposed therebetween. 2. An outer coil spring interposed in a compressed state between the flange of the inner coil cover and the end surface of the joint body. The corrugated pipe insertion type pipe joint according to claim 1.