JP2536369Y2 - Corrugated pipe insertion type pipe fitting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for a corrugated tube whose outer surface is formed in a corrugated shape.

[0002]

2. Description of the Related Art A pipe joint for a corrugated pipe is disclosed in, for example, JP-A-61-6491. This is a pipe joint having a joint body, a cap nut, and a sleeve whose inner surface is formed in a corrugated form.To connect the corrugated pipe using this pipe joint, first insert the cap nut into the corrugated pipe, and Open the notch on the circumference,
After attaching the sleeve to the corrugation of the corrugated tube by projecting about 5 peaks, the sleeve is inserted into the joint body. Thereafter, when the cap nut is screwed into the external thread of the joint body and tightened, the sleeve is reduced in diameter by the tapered surface of the inner diameter of the joint body and advances to the back of the joint body while holding the corrugated tube. Abuts the pipe receiving wall formed in the back of the joint body,
The protruding portion at the tip of the sleeve is press-bonded between the sleeve and the tube receiving wall portion to be connected while maintaining the sealing property.

[0003] As another pipe joint for a corrugated pipe, Japanese Utility Model Laid-Open No.
There is one disclosed in Japanese Patent No. 75691. This includes a cylindrical main body, a chuck divided into three or more in an axial direction having a corrugated inner surface engaged with a corrugated outer surface of a corrugated tube, and a sleeve capable of supporting the chuck so as to be able to expand and contract and moving the outer periphery of the cylindrical main body. And a pipe joint having: In connecting the corrugated tube, first, the chuck is expanded, the corrugated tube is inserted, and the sleeve is moved to the rear end side, so that the chuck fits into the chuck narrow pressure portion of the cylindrical main body and narrows in the centripetal direction. ,
An inner surface of the chuck similar to the outer surface of the corrugated tube engages and presses against 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 pressed and connected to a metal seal portion provided inside the cylindrical main body.

[0004]

Among the above-mentioned conventional pipe joints, those disclosed in Japanese Patent Application Laid-Open No. 61-6491 disclose the insertion of a cap nut into a corrugated pipe, the attachment of a sleeve to the corrugated pipe, and the like.
Insertion of the sleeve holding the corrugated tube into the joint body, tightening of the cap nut and various operations are required, that is, the workability is not always satisfactory. 1-75
Similarly, the work disclosed in Japanese Patent No. 691 was not necessarily good in workability. Accordingly, an object of the present invention is to provide a pipe joint for a corrugated pipe with improved workability.

[0005]

According to the present invention, there is provided a joint body in which a concave groove, a convex ridge, and a locking groove are formed in this order from the inlet side of the inner peripheral surface, and the concave part of the joint body. A stop ring attached to the groove, which can be radially expanded and contracted, has an inner surface shape to be engaged with an outer surface shape of a corrugated tube to be connected,
A retainer provided with a concave groove on the outer peripheral surface for engaging with the stop ring and provided with a slit in an axial direction, a packing mounted on the inner side of the ridge of the joint body, and an engaging groove or an engaging projection on an outer surface; An inlet-side coil cover provided with a flange that presses the packing inward on the inlet side, and an engagement groove or an engagement protrusion of the inlet-side coil cover mounted on the outside of the inlet-side coil cover. Having an engagement protrusion or an engagement groove to be fitted,
A rear side coil cover formed by protruding a flange that engages with the front surface of the corrugated tube on the rear side, and formed on the outer surface of the rear side coil cover, and projects to the large diameter side from the locking groove of the joint body. A corrugated pipe plug-in type pipe joint having a protrusion regulated by an inner surface on the inlet side and an inner coil spring interposed in a compressed state between the two flanges of the inlet side coil cover and the inner side coil cover. Thus, the above object has been achieved.

However, instead of the inlet side coil cover and the back side coil cover, an outer surface has an engaging groove or an engaging protrusion,
A rear coil cover having a flange protruding inward from the front side of the corrugated tube on the rear side, and an engagement groove or projection of the rear coil cover mounted on the outside of the rear coil cover on the inner surface. An inlet-side coil cover having an engaging protrusion or an engaging groove that fits with the inlet-side coil cover provided with a flange that presses the packing inward on the inlet side, and formed on the outer surface of the inlet-side coil cover to the large diameter side. The protrusion of the joint body may be restricted by the inner surface of the joint body on the inlet side with respect to the locking groove. Further, an outer coil spring may be interposed between the flange of the rear coil cover and the rear end surface of the joint body in a compressed state.

[0007]

Since the present invention has the above-described structure, the two coil covers are about to be axially separated from each other by the inner coil spring interposed between the two coil covers.
Therefore, at the same time as the engaging grooves or the engaging projections provided on the opposite coil covers are fitted and pressed in the axial direction,
When one of the coil covers is reduced in diameter, the projection presses the circumferential surface on the small diameter side in the radial direction. As a result, the projection is about to project toward the large diameter side. It is regulated by the inner surface on the inlet side of the groove. Therefore, both coil covers and the inner coil spring are free in the axial direction. Here, if an outer coil spring is interposed between the rear coil cover and the rear end face of the joint body, the two coil covers and the inner coil spring can be reliably kept in the state of being moved to the inlet side.

When the retainer is opened by splitting the retainer, the tip of the corrugated tube to be connected is projected, the retainer is fitted to the corrugation of the corrugated tube, and the retainer holding the corrugated tube is inserted into the joint body. The stop spring expands its diameter to allow the retainer to enter, reaches the concave groove on the outer surface of the retainer, reduces its diameter, and locks the retainer at that position. On the other hand, the front surface of the corrugated tube presses the flange of the back side coil cover to the back side against the outer coil spring, so that the coil cover portion moves to the back side as a whole, and the protrusion is formed by the locking groove of the joint body. When the protrusion reaches to the large diameter side, the inner coil spring separates both coil covers in the axial direction, the inlet side coil cover presses the packing, and the packing moves through the inner side coil through the inlet side coil cover. It is always pressed by the spring and bulges radially, and always seals between the outer surface of the corrugated tube and the inner surface of the joint body.

At this time, when the inner wall surface on the inlet side of the concave groove of the joint body is formed with a reduced diameter toward the inlet side, if the corrugated pipe is pulled out after the connection, the stop rig moves together with the retainer in the drawing direction. However, since the stopping ring receives the diameter reducing action by the reduced diameter surface of the concave groove and strongly grips the retainer, the pull-out inhibiting force is more reliably exerted. Also, when the inner side wall surface of the ridge of the joint body is formed by reducing the diameter toward the inlet side, the packing expands due to the pressing by the inner coil spring and also reduces the diameter by moving the joint body toward the inlet side. The gap between the outer surface of the corrugated tube and the inner surface of the joint body is more securely sealed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 of a first embodiment of the present invention before connection of a corrugated tube, and FIG. 3 shows a state of the same embodiment after connection of a corrugated tube. The corrugated pipe plug-in type pipe joint of this embodiment has a joint body 10
, Joint member 17, O-ring 18, retainer 20
, The inlet side coil cover 30 and the back side coil cover 35
, Stop ring 40, packing 42, and projection 4
4, an inner coil spring 46, and an outer coil spring 48.

First, the joint body 10 is formed in a hexagonal cylindrical shape, and is located on the inner peripheral surface from the inlet side (right side in the drawing) to the back side (left side in the drawing).
A circumferential groove 11, a circumferential ridge 13, and a circumferential locking groove 15 are formed in this order. Groove 1
The inner wall surface on the entrance side of 1 is an inclined surface 1 whose diameter decreases toward the entrance side.
2, in this embodiment, the inclination angle of the inclined surface 12 is 45 °. The inner wall surface of the ridge 13 is also formed on an inclined surface 14 whose diameter decreases toward the entrance side. The inlet side of the locking groove 15 is formed on the inner circumferential surface 16 of the cylinder, and a joint member 17 having a pipe tapered male thread formed on the opposite side of the inlet side of the joint body 10 through an O-ring 18. Screwed with a seal. In addition, the joint member 17 is provided separately for facilitating the assembly, but it is not always necessary to constitute the joint member 17 separately, and the joint body 10 may be constituted integrally.

The stop ring 40 is formed by a so-called garter coil, which is formed of a metal coil formed in an annular shape, that is, formed in a shape in which a metal wire is wound around the outer periphery of a donut so as to be freely expandable and contractable. Groove 11 of
Is mounted inside. However, the stop ring 40 may be another known retaining mechanism such as a disc spring shape.

A concave groove 21 into which a stop ring 40 is fitted is formed on the outer peripheral surface of the retainer 20.
An outer peripheral surface of a front end (left end in the drawing) of 0 is formed on a tapered surface 22 whose diameter decreases toward the front end side. On the other hand, retainer 20
Of the corrugated tube 1 is a corrugated inner surface 2
3 is formed. 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. In other words, the slit 24 can be provided at two or more places so that it can be completely divided into two or more parts, or as shown in FIG.薄 A thin portion 25 may be provided in the separated portion so that it can be opened in the axial direction. The packing 42 is formed of rubber, has an inner diameter substantially equal to the outer diameter of the peak of the corrugated outer surface of the corrugated tube 1 to be connected, and is mounted on the back 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 has a concave groove 31 for engagement on the outer surface in the circumferential direction. A flange 32 protruding inward is formed on the inlet side of the inlet-side coil cover 30, and the inlet-side end surface of the flange 32 is in contact with the far-side end surface of the packing 42. The rear side coil cover 35 is also formed as a whole on a cylinder, is mounted on the outside of the inlet side coil cover 30, and engages with the concave groove 31 of the inlet side coil cover in the inner circumferential direction.
6 are formed. A flange 37 protruding inward is formed on the rear side of the rear coil cover 35, and the flange 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 rear coil cover is restricted by the cylindrical inner peripheral surface 16 on the inlet side of the engaging groove 15 of the joint body from projecting toward the large diameter side.
In addition, both flanges 3 of the inlet side coil cover and the back side coil cover
2 and 37, an inner coil spring 46 is interposed in a compressed state, and an outer coil spring 4 is provided between the flange 37 of the back coil cover and the inlet-side end face of the joint member 17.
8 are interposed in a compressed state. Outer coil spring 4
Numeral 8 holds both the coil covers 30, 35 and the inner coil spring 46 in a state of being moved to the inlet side.
It may be relatively weak. In some cases, it may not be provided. On the other hand, the inner coil spring 46
Is used to press and expand the packing 42, so that a relatively strong one is used.

This embodiment is configured as described above.
The inner coil springs 46 interposed between the two coil covers 30, 35 attempt to separate the two coil covers 30, 35 in the axial direction from each other. Further, since the coil covers are mounted in a reduced diameter state, they are attached to the inner coil covers. The provided protrusion 44 is about to protrude toward the large diameter side, and this protrusion is restricted by the cylindrical inner peripheral surface 16 on the inlet side of the engagement groove of the joint body. Therefore, both coil covers 30,
The inner coil spring 35 and the inner coil spring 46 are in a free state in the axial direction. As a result, the inner coil spring 46 and the inner coil spring 46 are moved toward the inlet side as a whole by the outer coil spring 48 interposed between the rear coil cover 35 and the joint member 17. It has been moved.

Then, the resin coating 2 covering the corrugated tube 1 is removed by a predetermined length, the slit 24 of the retainer 20 is opened, and the tip of the corrugated tube 1 is projected so that the retainer 20 is aligned with the crest of the corrugated tube 1. When the retainer 20 holding the corrugated tube 1 is mounted and inserted into the joint main body 10, the stop ring 40 gradually increases in diameter by the tapered surface 22 on the outer surface of the retainer, thereby allowing the retainer 20 to enter, and the concave groove on the outer surface of the retainer. 21 and the diameter of the retainer 2 is reduced at that position as shown in FIG.
Lock 0.

On the other hand, the front surface of the corrugated tube 1 pushes the flange 37 of the rear coil cover to the rear side against the outer coil spring 48, so that the coil covers 30, 35 and the inner coil spring 46 as a whole are Side, and the protrusion 44
The protrusion 44 projects to the large diameter side when the groove reaches the locking groove 15 of the joint body, the two coil covers 30 and 35 are separated from each other in the axial direction by the inner coil spring 46, and the inlet side coil cover 30 is And press packing 4
Numeral 2 is constantly pressed by the inner coil spring 46 via the inlet-side coil cover 30 and swells in the radial direction, so as to always seal the gap between the outer surface of the corrugated tube 1 and the inner surface of the joint body 10.

In this embodiment, since the inner wall surface on the inlet side of the concave groove 11 of the joint body is formed on the inclined surface 12, when the corrugated tube 1 is pulled out after the connection, the stop ring 40 is also pulled out together with the retainer 20. Although the stop ring 40 moves in the direction, the stop ring 40 is reduced in diameter by the inclined surface 12 of the concave groove and strongly grips the retainer 20, so that the pull-out preventing force is more reliably exerted. On the other hand, when the inclined surface 12 is not formed, the depth of the concave groove 21 of the retainer is set to at least the stop ring 40 in order to secure the stopping force against pulling out.
Is preferably formed deeper than the winding radius.

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 due to the pressing by the inner coil spring 46 and also moves toward the inlet side of the joint body 10. As a result of the movement, the diameter is reduced by the inclined surface 14 and the diameter is reduced, so that the gap between the outer surface of the ridge of the corrugated tube 1 and the inner surface of the joint body 10 is more reliably sealed.

In the above embodiment, the rear coil cover 35 is mounted outside the entrance coil cover 30, but as another embodiment, the entrance coil cover is mounted outside the rear coil cover. The same operation and effect as those of the above embodiment can be obtained even if the above configuration is adopted. The stop ring 40 must allow the retainer 20 to enter and prevent the retainer 20 from being pulled out. Either the wall surface is formed on the inclined surface 12, the outer peripheral surface of the front end 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. I just need.

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 necessarily required. is not.
When the disc-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]

According to the present invention, there is provided a pipe joint for a corrugated pipe, which can connect the corrugated pipes with a single touch, thus requiring no skill and shortening the connection work.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the retainer according to the embodiment,
A sectional view

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

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

[Explanation of symbols]

1. Corrugated tube 2. Resin covering part
10 Joint body 11 Groove 12 Slope
13 ... ridge 14 ... inclined surface 15 ... locking groove
Reference numeral 16: cylindrical inner peripheral surface 17: coupling member 18: O-ring 20: retainer 21: concave groove
22: tapered surface 23: inner corrugated surface 24: splitting
25: Thin portion 30: Inlet side coil cover 31: Groove
32 ... Tsuba 35 ... Back side coil cover 36 ... Projection
37 ... Tsuba 40 ... Stop ring 42 ... Packing
44: Projection 46: Inner coil spring 48: Outer coil spring

Claims (2)

(57) [Scope of request for utility model registration] 1. A groove extending inward from an inlet side of an inner peripheral surface,
A joint body in which a ridge and a locking groove are formed in this order; a stop ring mounted in the concave groove of the joint body and capable of expanding and contracting in a radial direction; and engaging with an outer surface shape of a corrugated pipe to be connected. A retainer having an inner surface shape, having a concave groove on the outer peripheral surface for engaging with the stop ring, and having a slit provided in an axial direction, a packing mounted on 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 engagement groove or an engagement protrusion on the inlet side, and a flange that presses the packing inwardly on the inlet side; and an outer or inner side of the inlet-side coil cover, which is fitted on the inlet side. A rear side coil cover having an engagement groove or engagement groove to be fitted with the engagement groove or the engagement protrusion of the coil cover, and a flange protrudingly provided on the inner side to engage with the front surface of the corrugated tube; Formed on the outer surface of one of the coil covers A protrusion that is restricted from protruding toward the large diameter side by an inner surface of the joint body on the inlet side with respect to the locking groove; and a compressed state between the two flanges of the inlet side coil cover and the back side coil cover. And an inner coil spring interposed therebetween. 2. An outer coil spring interposed in a compressed state between the flange of the rear coil cover and the rear end surface of the joint body. A pipe fitting according to claim 1 or 2.