JPH0538488U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] Corrugated tube 3 with a small number of parts and therefore inexpensive
Provided is a pipe joint for connecting the plastic pipe 2 with the plastic pipe 2. [Structure] A ridge 1a is provided on the inner peripheral surface of the central portion of the joint body 1,
A groove 1b is provided on the inner peripheral surface of the ridge 1a on the corrugated pipe side, and an O-ring 6 is mounted on the inner peripheral surface of the ridge 1a on the plastic pipe side. The resin coating 9 is covered with the coating 9, the resin coating 9 is projected to the corrugated pipe side, the concave groove 9b is formed on the inner peripheral surface of the protruding portion 9a, the watertight packing 7 is attached, and the resin coating 9 is projected to the plastic pipe side. 9c, the packing 5 is mounted over the inner peripheral surface of the joint body 1 and the plastic pipe side end, and the inner peripheral surface from the corrugated pipe side end of the joint body 1 to the plastic pipe side end of the resin coating 9 is corrugated. The stiffener 4 is attached through the pipe 3 and the plastic pipe 2, and the corrugated pipe 3 and the plastic pipe 2 are fixed by expanding the diameter of the stiffener 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for connecting a corrugated pipe and a plastic pipe.

[0002]

[Prior Art]

 Pipe joints for connecting corrugated pipes and plastic pipes are being used in parts from the buried part of gas pipes that enter gas meters. As such a pipe joint, there is one disclosed in Japanese Utility Model Laid-Open No. Sho 63-190688, which is a pipe joint for connecting a flexible pipe whose outer surface is coated with a resin and a plastic pipe. The outer peripheral surface on the connection side has a screw, and the inner peripheral surface is a cylindrical inner peripheral surface.The outer surface on the connection side of the plastic pipe was resin-coated, and a radial groove was formed on the inner peripheral surface. A pipe fitting body, a nut having a brim at the end that is screwed into the male thread of the pipe fitting body, a nut whose outer surface is resin-coated, and an outer peripheral surface which is fitted to a cylindrical inner peripheral surface of the pipe fitting body. The inner peripheral surface has a retainer that engages with the outer surface of the flexible pipe from which the resin coating has been removed, a flange portion that contacts the end of the plastic pipe, and a cylindrical portion that fits with the inner peripheral surface of the plastic pipe. Stiffener and collar of the nut An annular rubber packing provided on the longitudinal surface of the resin coating, an annular rubber packing that seals the resin coating extending from the nut body and the resin coating of the pipe joint body on the side opposite to the flange of the nut, and The pipe joint is characterized by comprising an annular rubber packing provided on the longitudinal surface of the resin coating on the side surface of the end portion of the pipe joint body.

[0003]

[Problems to be solved by the device]

 The above-mentioned pipe joint has a problem that it has a large number of parts and is therefore expensive. It is an object of the present invention to provide a pipe joint for connecting a corrugated pipe and a plastic pipe, which has a small number of parts and is therefore inexpensive.

[0004]

[Means for Solving the Problems]

 According to the present invention, a convex strip is provided on the inner peripheral surface of the central portion of the joint body, a groove is provided on the inner peripheral surface of the corrugated pipe of the convex strip, and an O-ring is mounted on the inner peripheral surface of the plastic pipe of the convex strip. A groove is provided, the outer peripheral surface of the joint body is covered with a resin coating, the resin coating is projected toward the corrugated pipe, and a groove is formed on the inner peripheral surface of the protruding portion to attach a watertight packing, The resin coating is projected to the plastic pipe side, and packing is installed over the inner peripheral surface of the joint body with the plastic pipe side end portion, from the joint body corrugated pipe side end portion to the resin coating plastic pipe side end portion. The above object is achieved by mounting a stiffener on the inner peripheral surface via the corrugated pipe and the plastic pipe, and expanding the diameter of the stiffener to fix the corrugated pipe and the plastic pipe.

[0005]

[Action]

 Insert a corrugated pipe with the insertion end processed into a cylindrical shape from the end of the joint body on the corrugated pipe side, and project the insertion end of the corrugated pipe to the plastic pipe side rather than the ridge of the joint main body. A jig is inserted from the end on the pipe side to expand the insertion end of the corrugated pipe. Next, insert the stiffener and the plastic pipe from the end of the joint body on the plastic pipe side, and insert the jig from the other end of the plastic pipe to expand the diameter of the stiffener. Connected by pipe fittings. At this time, the corrugated pipe is flared on the plastic pipe side of the ridge of the joint body to counter the pulling force, and at the same time achieves internal fluid sealing with the O-ring in the concave groove. The ridge of the joint body protrudes into the groove provided on the inner peripheral surface of the plastic pipe to counter the pulling force and at the same time achieves internal fluid sealing, and the watertight packing seals between the corrugated pipe and the cladding pipe. The corrugated pipe side to prevent the external fluid from entering, and the packing blocks the plastic pipe side to prevent the external fluid from entering, and thus the corrugated pipe and the plastic pipe are sealed by the main pipe joint against the fluid inside and outside. Are connected to each other.

[0006]

【Example】

 The present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This pipe joint comprises a joint body 1, a resin coating 9, a stiffener 4 made of copper, a packing 5, two O-rings 6 and a watertight packing 7. .. A protrusion 1a is provided on the inner peripheral surface of the center of the joint body 1, and two recessed grooves 1b are provided on the inner peripheral surface on the left side of the protrusion 1a in the drawing. The O-ring 6 is attached to the. Further, four concave stripes 1c are provided on the inner peripheral surface on the right side of the convex stripe 1a in the drawing. The outer peripheral surface of the joint body 1 is integrally covered with a resin coating 9. The resin coating 9 projects further to the left beyond the left end of the joint body 1 in the drawing, and the inner peripheral surface of the projecting portion 9a. A groove 9b is formed in the groove 9b, and a watertight packing 7 is attached to the groove 9b. The resin coating 9 also projects further to the right beyond the right end of the joint body 1 in the drawing, and the packing 5 is attached to the inner peripheral surface of the protruding portion 9c and the right end of the joint body 1 in the drawing. It A stiffener 4 is attached to the inner peripheral surface of the joint body 1 from the left end in the drawing to the right end in the resin coating 9 via a corrugated pipe 3 and a polyethylene pipe 2 to be connected.

The present embodiment is configured as described above, and the method of using this pipe joint will be described below. First, the packing 5, the O-ring 6 and the watertight packing 7 are attached to the joint body 1 and the resin coating 9 which are integrally formed. On the other hand, in the corrugated pipe 3, the covering pipe 8 on the insertion end side is cut off and the insertion end is processed into a cylindrical shape. Then, the insertion end of the corrugated pipe 3 is inserted from the left side of the drawing of the joint body 1, the insertion end is projected to the right side of the drawing from the convex strip 1a of the joint body, and the jig ( (Not shown) is inserted and the insertion end of the corrugated tube is expanded in diameter to form the flared portion 3a. Then, the stiffener 4 and the polyethylene pipe 2 are inserted from the right side of the drawing of the joint body. At this time, it is preferable that the stiffener 4 has a small diameter on the side of the corrugated pipe and a large diameter on the side of the polyethylene pipe so that the stiffener 4 is positioned so as to be in contact with the flared portion 3a of the corrugated pipe. Then, a jig (not shown) is inserted from the other end of the polyethylene pipe to expand the diameter of the stiffener 4 in the groove 1b and the groove 1c of the joint body.

As a result, the corrugated pipe 3 and the polyethylene pipe 2 are connected by the main pipe joint, and at that time, the flared portion 3a of the corrugated pipe engages with the ridge 1a of the joint body and exerts a pullout preventing force. .. Further, the outer surface of the corrugated pipe 3 bites into the concave groove 1b of the joint body to exert a further pulling-out blocking force, and the stiffener 4 further bites into the inner surface of the corrugated pipe 3 which bites into the concave groove 1b. Since the diameter of the ridge 1a of the joint body is increased on the right side of the drawing, the corrugated pipe 3 is also prevented from coming off through the stiffener 4. On the other hand, the polyethylene pipe 2 bites into the recess 1c of the joint body and is similarly retained.

Further, the outer surface of the corrugated pipe 3 is sealed with the O-ring 6 in the concave groove 1b, and the outer surface of the polyethylene pipe 2 is cut into the concave groove 1c to be sealed, so that the internal fluid in the main pipe joint is eventually sealed. Is completely sealed. On the other hand, the watertight packing 7 seals the space between the main pipe joint and the covering pipe 8 of the corrugated pipe to prevent the external fluid from entering from the corrugated pipe 3 side, and the packing 5 seals between the main pipe joint and the polyethylene pipe 2. The polyethylene pipe 2 is sealed to prevent invasion of external fluid from the side of the polyethylene pipe 2, and thus the corrugated pipe 3 and the polyethylene pipe 2 are connected to each other with the sealing property against the fluid inside and outside by the main pipe joint. Therefore, the component structure of the main fitting is simple, and therefore the main fitting is an inexpensive fitting.

Next, FIG. 2 shows another embodiment of the present invention, and this embodiment shows a pipe joint in the case where a protective pipe 10 is provided on the outer surface of the cladding pipe 8 on the outer surface of the corrugated pipe 3. .. The protective tube 10 is provided to prevent the corrugated tube 3 from being crushed during burial, and to prevent aging due to sunlight and damage due to the external environment when exposed piping, the outer surface of which is in the axial direction as shown in the figure. It is formed in a concave-convex shape and is attached to the outer surface of the cladding tube 8 by a cap 11. In this embodiment, however, the protruding portion 9a of the resin coating 9 toward the corrugated pipe side (left side in the drawing) projects further than in the previous embodiment, and the diameter increases toward the tip side (left side) toward the tip side. A tapered inner surface 9d is formed, and windows 9f, 9f extending in the circumferential direction are formed at the tip portion (left end portion), leaving joint portions 9e, 9e spaced 180 ° in the circumferential direction.

A second watertight packing 12 is attached to the taper inner surface 9d of the resin coating, and the second watertight packing 12 is subjected to a diameter reducing action by the taper inner surface 9d, so that the taper inner surface 9d and the outer surface of the protection tube 10 are There is a seal between Further, a stopper 13 is attached to the resin-coated window 9f, and the stopper 13 penetrates the windows 9f and 9f and is fitted into the outer surface concave portion of the protection tube 10, and a pair of fitting portions 13a and 13a. It is composed of a connecting portion 13b for connecting the portions 13a and 13a so as to be capable of expanding the diameter, and after inserting the protective pipe 10 into the main joint, push in the stopper 13 so as to straddle one of the connecting portions 9e of the resin coating, The protection tube 10 is prevented from coming off. Also in this pipe joint, it is possible to obtain the same effect as that of the previous embodiment.

[0012]

[Effect of the device]

 The present invention provides a pipe joint for connecting a corrugated pipe and a plastic pipe, which has a small number of parts and is therefore inexpensive.

[Submission date] April 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

A second watertight packing 12 is attached to the taper inner surface 9d of the resin coating, and the second watertight packing 12 is subjected to a diameter reducing action by the taper inner surface 9d, so that the taper inner surface 9d and the outer surface of the protection tube 10 are provided. There is a seal between Also the windows 9f of the resin coating is mounted a stopper 13 in Figure 3. Figure shows, the stopper 13, the window 9f, 9f and fitted to the outer surface concave portion of the protective tube 10 through transmural pair of fitting portions 13a, 13a And a connecting portion 13b for connecting the fitting portions 13a, 13a so as to be capable of expanding the diameter. By pushing in, the protection tube 10 is prevented from coming off. Also in this pipe joint, the same effect as in the previous embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a lower half of an upper half section showing an embodiment of the present invention.

FIG. 2 is a front view of a lower half of an upper half section showing another embodiment.

[Explanation of symbols]

1 ... Joint body 1a ... Convex strip 1
b ... concave groove 1c ... concave line 2 ... polyethylene pipe 3
... Corrugated tube 3a ... Flare processing part 4 ... Stiffener 5
… Packing 6… O-ring 7… Watertight packing 8
... cladding tube 9 ... resin coating 9a, 9c ... protruding portion 9
b ... concave groove 9d ... taper inner surface 9e ... connecting portion 9
f ... window 10 ... protective tube 11 ... cap 1
2 ... 2nd watertight packing 13 ... Stopper 13a ... Fitting part 1
3b ... connecting part

[Procedure amendment]

[Submission date] April 7, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Added

[Correction content]

3 (A) is a plan view and FIG. 3 (B) is a front view showing the stopper of the embodiment.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Added

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Shigeru Mizutani No. 2 Daifuku, Kuwana City, Mie Prefecture Inside the Kuwana Factory of Hitachi Metals Ltd.

Claims (1)

[Scope of utility model registration request] 1. A pipe joint for connecting a corrugated pipe and a plastic pipe, wherein a ridge is formed on the inner peripheral surface of the central portion of the joint body, and a concave groove is formed on the inner peripheral surface of the ridge on the corrugated pipe side. A ring is attached, and a concave line is provided on the inner peripheral surface of the convex line on the plastic pipe side.
The outer peripheral surface of the joint body is covered with a resin coating, the resin coating is projected toward the corrugated pipe side, a groove is formed in the inner peripheral surface of the protruding portion, and a watertight packing is attached, and the resin coating is covered with a plastic pipe. The packing body over the inner peripheral surface of the joint body with the plastic pipe side end portion, and the corrugated pipe is formed on the inner peripheral surface of the joint body from the corrugated pipe side end portion to the resin-coated plastic pipe side end portion. A pipe joint in which a stiffener is attached via a plastic tube and a plastic tube, and the diameter of the stiffener is expanded to fix the corrugated tube and the plastic tube.