JPH07239074A - Joint device for piping - Google Patents

Abstract

PURPOSE:To prevent a stopping ring from rotating in fastening of a fastening member so as to prevent a flexible pipe from being twisted. CONSTITUTION:A joint device for piping consists of a joint main body 1 having a hole part 2, which penetrates in the shaft center direction and forms a flexible pipe connecting hole part 9 provided with a stepped part in the middle of itself, in its inside, a stopping ring 12 which is formed into a one-piece divided ring for wrappingly engaging the tip of a flexible pipe 11, is formed expansively in the diameter direction, and has a plate cross section, and a fastening member 13, which is screwed to the joint main body 1 and presses the stopping ring 12 toward the inside of the connecting hole part 9. Therefore, in the joint device for piping, the diameter of the stopping ring 12 is shrunk by pressing of the fastening member 13 so as to wrappingly engage the tip of the flexible pipe 11, while projection parts 23 are arranged at proper intervals in the circumference direction on one side face of the stopping ring 12 opposed to the tip of the fastening member 13, and the tip of the fastening member 13 is brought into contact with the projections 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for piping.

[0002]

2. Description of the Related Art Conventionally, a method has been adopted in which a flexible pipe is connected to a gas pipe arranged along an outer wall of a building such as a house by using a joint device to branch the gas flow path. ing.

A conventional joint device is, for example, JP-A-60
There are known ones disclosed in Japanese Patent Laid-Open No. 62692 and Japanese Patent Laid-Open No. 60-73193, and those disclosed in each of these publications connect one end of a spiral or bellows-shaped flexible pipe in a joint body. In order to make the flexible tube hug the vicinity of one end, the front shape is circular and is several mm in the axial direction.
A retaining ring with the above thickness is used.With this retaining ring, one end of the flexible tube is attached to the fitting body, and this is inserted into the joint body, and the retaining ring is tightened by tightening the cap nut screwed to the joint body. The flexible pipe is connected to the joint body by pushing it inside the joint body.

[0004]

However, in the joint device having such a structure, since the contact surface between the snap ring and the inner surface of the joint body is circular, the cap nut and the snap ring contact each other when the cap nut is tightened. There was a problem that the retaining ring rotates due to the frictional force, which also rotates the flexible pipe and twists the flexible pipe, affecting the subsequent work. Further, the snap ring is divided into two parts so as to embrace the vicinity of one end of the flexible pipe from both sides, and the snap ring embraces the vicinity of one end of the flexible pipe when the flexible pipe is inserted into the joint body. There was a problem that it was difficult to do the work because it had to be set while holding.

The present invention solves such a problem by making it possible to easily set a flexible pipe and a retaining ring in the joint body, and prevent the retaining ring from rotating during tightening. The purpose is to prevent twisting.

[0006]

In order to solve this problem, the present invention has a flexible pipe connection having a hole portion penetrating in the axial direction in the inside thereof, and a step portion provided in the middle of the hole portion. A joint body having a hole formed therein, a retaining ring having a plate-like cross section formed in a split ring shape so as to be capable of reducing the diameter of the flexible tube so as to embrace and engage the distal end of the flexible tube, and screwed to the joint body. A coupling device for piping, which is configured by a tightening member that presses the retaining ring inward of the connection hole, and the retaining ring is configured to reduce the diameter by pressing the clamping member and to hug and engage the tip of the flexible pipe. The projections are provided at appropriate intervals in the circumferential direction on one surface of the retaining ring facing the tip of the tightening member, and the tip of the tightening member contacts the projection.

[0007]

With this structure, since the tip of the tightening member abuts on the convex portion of the retaining ring when the tightening member is rotationally tightened, the tightening member tends to be transmitted from the tip of the tightening member to the retaining ring when the tightening member is rotationally tightened. As a result, the retaining ring does not rotate together, and twisting of the flexible pipe can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, 1 has a hole 2 penetrating in the axial direction in the inside, and a male screw part 4 is formed on the outer surface on one end side with a collar part 3 provided on the outer surface as a boundary, and an inner surface on the other end side is formed. In the joint body in which the female screw portion 5 is formed, the hole portion 2 has a small diameter hole portion 2a on the male screw portion 4 side and a large diameter hole portion 2 on the female screw portion 5 side.
b, a ring-shaped ridge 6 projecting toward the hole 2b is formed at the step of the boundary between the holes 2a and 2b. An annular groove portion 8 into which the ring 7 (or a square ring is acceptable) is inserted is formed. The large-diameter hole 2b has a hole 9 continuous with the annular groove 8 located on the inner side, and a hole 9 connected to the hole 9 via a tapered surface 10 and extending to the outer end side. The internal thread portion 5 having a larger diameter than the portion 9 is provided.

The bellows-shaped metal flexible pipe 11 connected to the joint body 1 in the hole 2b has a split ring-like elasticity which is formed so as to be reduced in diameter for connection with the joint body 1. One end is huggably engaged by the retaining ring 12 provided. The retaining ring 12 is made of metal and has a plate-like cross section with a thickness of about 1 mm. The retaining ring 12 has a notch 12
a are formed at appropriate intervals. 12b is a split part of the retaining ring 12. Furthermore, this snap ring 12 is the joint body 1
The outer diameter is slightly smaller than the inner diameter of the female screw portion 5 before being inserted into the hole portion 2b of the joint body 1, but after being inserted into the hole portion 2b of the joint body 1, the position before the tapered surface 10 is In the above, the diameter is expanded by an appropriate jig, and the diameter is slightly larger than the inner diameter of the female screw portion 5 and larger than the inner diameter of the hole portion 9,
Further, the inner diameter is adjusted to be equal to or larger than the outer diameter of the uneven peaks of the flexible tube 11.

The tightening member 13 has a hole portion 14 penetrating in the axial direction for inserting the flexible tube 11 therein, and a head portion 15 having an approximately hexagonal outer surface on one end side in the axial direction. A male screw portion 16 having a smaller diameter than the outer surface of the head portion 15 and screwed into the female screw portion 5 is provided from the head portion 15 to the other end side, and the outer diameter is from the male screw portion 16 to the other end side to the female screw portion. Push-in portion having a smaller diameter than the portion 5 and fitted into the hole portion 9
Equipped with 17. The inner diameter of the push-in portion 17 is formed to be slightly larger than the outer diameter of the ridges and valleys of the flexible tube 11.

Reference numeral 18 is inside the head 15 so as to be in close contact with the outer surface of the flexible tube 11 inserted through the hole 14 (more specifically, the outer surface of a synthetic resin cover 19 covering the portion of the flexible tube 11 excluding the tip). The sealing packing fitted in the annular groove portion 20 formed on the inner surface of the hole portion 14 in 21, the groove portion 22 formed at the end portion of the male screw portion 16 at the connecting portion between the head portion 15 and the male screw portion 16. It is an O-ring for a seal that is fitted.

By the way, the retaining ring 12 is provided with convex portions 23 on one surface facing the tip of the male screw portion 16 of the fastening member 13 at appropriate intervals in the circumferential direction, and when the fastening member 13 is fastened. The tip of the male screw portion 16 of the tightening member 13 is configured to abut the convex portion 23. The convex portion 23
May be formed integrally with the retaining ring 12, or may be formed by attaching another member to the retaining ring 12.

Next, the joint device and the flexible pipe described above
The connection sequence with 11 will be described. First, the retaining ring 12 is inserted into the hole 2b of the joint body 1. The retaining ring 12 stops when the outer circumference is in contact with the large diameter portion of the tapered surface 10 at the inner end of the female threaded portion 5, and is expanded by a suitable jig at a position before the tapered surface 10. Next, the tightening member 13 is screwed onto the joint body 1 until the pushing portion 17 at the tip approaches the retaining ring 12. The state is shown in FIG. 1, and in the state shown in FIG. 1, one end side of the flexible pipe 11 is inserted into the hole 2b of the joint body 1 until it abuts against the annular ridge 6.
In this state, the flexible pipe is inward of the retaining ring 12.
Two peaks of unevenness at one end of 11 will be projected. Further, the inner diameter of the O-ring 7 is formed slightly smaller than the outer diameter of the ridges and valleys of the flexible tube 11, and the tip of the flexible tube 11 also contacts the O-ring 7.

When the tightening member 13 is tightened with a jig in this state, the retaining ring 12 is pushed from the male screw portion 16 by the tip of the pushing portion 17 on the other end side, and the retaining ring 12 has an outer peripheral portion with the tapered surface. While hitting 10, the diameter is reduced until it comes into contact with the O-ring 7 inside the hole 9. Due to the diameter reduction and movement of the retaining ring 12, the retaining ring 12 hugs and engages one end of the flexible tube 11, and the two peaks and depressions of the flexible tube 11 projecting from the retaining ring 12 are crushed and the deformed portion 11a thereof is deformed. Forcibly expands the O-ring 7 and press-contacts the ridge 6. Further, the O-ring 7 pressed by the movement of the retaining ring 12 is pressed against the deformable portion 11a from the outside. As a result, the joint body 1 and the flexible pipe 11 are connected.

By the way, in the present embodiment, the joint device 1
And a flexible member for connecting the flexible tube 11
When rotating 13 to tighten, the tip of the push-in portion 17 of the tightening member 13 comes into contact with the convex portion 23 of the retaining ring 12, so compared with the case where the tip of the push-in portion 17 of the tightening member 13 makes surface contact with the retaining ring 12. The rotational force of the tightening member 13 that is transmitted from the tip of the pushing portion 17 of the tightening member 13 to the retaining ring 12 when the tightening member 13 is rotationally tightened is reduced, and as a result, the retaining ring 12 does not rotate together. The twisting of the flexible pipe 11 can be prevented.

Although not shown in the drawing, another pipe communicating with the flexible pipe 11 via the joint body 1 is screwed to the male screw portion 4 of the joint body 1.

[0017]

As described above, according to the present invention, when the flexible pipe is inserted into the joint body, it is not necessary to set the flexible pipe while holding the vicinity of one end of the flexible pipe with the retaining ring, and the flexible pipe can be set inside the joint body. The flexible tube and the retaining ring can be easily set to the stopper, and the tip of the clamping member abuts the convex portion of the retaining ring when the clamping member is rotationally tightened. The torque of the tightening member to be transmitted is reduced, and as a result, the retaining ring does not rotate together, and twisting of the flexible pipe can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a state before tightening of a tightening member in an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a state after tightening the tightening member.

FIG. 3 is a perspective view of the retaining ring.

[Explanation of symbols]

 1 Joint body 2 Hole 2a Hole 2b Hole 3 Collar 4 Male screw 5 Female screw 6 Convex 7 O-ring 8 Groove 9 Hole 10 Tapered surface 11 Flexible pipe 12 Retaining ring 13 Tightening member 14 Hole 15 head Part 16 Male screw part 17 Push-in part 23 Convex part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000231121 Nippon Steel Pipe Fitting Co., Ltd. 1 153 Tajime-cho, Kishiwada-shi, Osaka (72) Inventor Takayuki Nakanishi 4-1-2, Hirano-cho, Chuo-ku, Osaka, Osaka Inside Gas Co., Ltd. (72) Inventor Kozo Nishiike 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Toshio Shiabuchi, Minami-Kagaya, Suminoe-ku, Osaka-shi, Osaka No. 16 in Shinwa Sangyo Co., Ltd. (72) Inventor Yoshio Watanabe 1 of 18 Hanana Kamitaba, Minami-ku, Kyoto-shi, Kyoto Prefecture Fujii Alloy Co., Ltd. (72) Inventor Keitaro Kashino, Kyoto-shi Minami, Kyoto Prefecture No. 18 Kaminato, Hana, ward, Fujii Alloy Co., Ltd. (72) Hideo Hirabayashi, One day, 153 Tajime-cho, Kishiwada, Osaka Prefecture

Claims (1)

[Claims] 1. A hole portion that penetrates in the axial direction is provided inside,
The joint body having a flexible pipe connection hole formed with a step in the middle of the hole and the flexible pipe are formed in a split ring shape so that the distal end of the flexible pipe can be engaged with the joint body. The retaining ring has a plate-shaped cross section and a tightening member that is screwed into the joint body and presses the retaining ring inward of the connection hole. The retaining ring is pressed by the tightening member to reduce the diameter of the flexible pipe tip. Is a joint device for pipes configured to be embodied in an embrace, wherein convex portions are provided at appropriate intervals in the circumferential direction on one surface of the retaining ring facing the tip of the fastening member, A joint device for piping, the tip of which is configured to abut this convex portion.