JPH0734290U - Flexible pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the connection operability on the male connection fitting side of a flexible pipe joint, and to improve seismic resistance and liquid tightness. [Structure] A sleeve is liquid-tightly fixed to a parallel tube portion at an end of a wavy flexible tube 20. A male connecting fitting 36 with a tapered male screw is fitted in series with this so as to be rotatable and axially movable, and is prevented from coming off by the flange 23a.
On the outer periphery of the sleeve 30, the expanded diameter cylindrical portion 30a of the male connecting fitting 36 is provided.
And then seal with the O-ring 37.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible pipe joint mainly used for water supply piping.

[0002]

[Prior art]

 Conventionally, in waterworks, for example, a flexible pipe joint made of a lead pipe was used for the part from the main pipe under the road to the house premises, but in recent years, the section using a stainless steel has a corrugated cross section. Flexible pipe joints that use flexible pipes with cylindrical walls have come into use.

FIG. 2 shows a conventional flexible pipe joint using a flexible pipe made of stainless steel. In FIG. 2, reference numeral 1 denotes a flexible pipe having parallel pipe portions 3 a and 3 b at both ends of a flexible portion 2. A male connecting fitting 5 having a tapered male screw 4 at the tip is fitted to the outer circumference of one parallel tube portion 3a, and an O-ring 7 is fitted in an annular groove 6 formed on the inner circumferential surface of the fitting. A liquid-tightness is provided by fitting an annular ridge, which is pressed from the inner surface of the parallel tube portion and bulged outwardly, into the groove 6. On the other side of the parallel tube portion 3b, a female connecting fitting 10 in which a bag nut 9 is fitted around the outer periphery of the tip portion of the sleeve 8 is fitted, and the sleeve 8 is prevented from coming off with a flange 11 at the tip of the parallel tube portion 3b. ing. Both ends of the blade 12 covering the outer circumference of the flexible portion 2 are fixed to the outer circumferences of the sleeve 8 and the rear end of the male connecting fitting 5.

In the figure, 13 is a protective tube made of synthetic resin and covered on the outermost layer.

[0005]

[Problems to be solved by the device]

 In such a conventional flexible pipe joint, the male connection fitting 5 side is screwed into one of the pipes to be connected, and then the nipple of the other pipe is butted against the female connection fitting 10 and the cap nut 9 is attached to the outer periphery thereof. However, when connecting the male connection fitting 5 to the pipe, it is necessary to turn the entire joint including the flexible pipe 1. If the entire joint is long, the work is In addition to the difficulty, there is a problem that, for example, when the flexible portion is bent and passed under the U-shaped groove, it becomes impossible to turn.

In view of the above problems, the present invention has been made for the purpose of providing a flexible pipe joint in which the male screw portion can be rotated even on the male connection fitting side and which is excellent in earthquake resistance and liquid tightness. .

[0007]

[Means for achieving the object]

 The feature of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is that parallel pipe portions are integrally provided at both ends of a flexible portion formed by a tubular wall having a corrugated cross section. In a flexible pipe joint in which each parallel pipe portion of the flexible pipe is provided with a connection fitting with a screw, a sleeve is fitted to the outer periphery of at least one of the parallel pipes, and the parallel groove is formed in the annular groove on the inner surface of the sleeve. The ring-shaped ridges on the outer surface of the pipe are closely fitted together with an elastic seal ring interposed, and the parallel pipe on the tip side of the sleeve has a male connecting fitting with a taper male screw on the outer circumference that is rotatable and axial. Slidably, the male connecting fitting is retained by the flange at the tip of the parallel pipe portion, and a diametrical expansion portion is provided at the rear end of the male connecting fitting to which the tip of the sleeve fits. Elasticity between the inner surface of the expanded part and the outer surface of the sleeve In that is interposed Ruringu (claim 1). An elastic seal ring, which is different from the elastic seal ring in the annular groove, may be interposed between the inner surface of the sleeve and the outer surface of the parallel tube of the flexible tube in parallel with the groove (claim 2). .

[0008]

[Action]

 In the flexible pipe joint of the present invention, the other end of the flexible pipe is piped at a predetermined position, and the male connecting fitting can be rotated even after the other end is connected. It can be inserted and screwed into the internal thread. In addition, even if vibrations in the twisting direction and the expansion / contraction direction are applied after the connection, the male connecting fitting swivels and slides with respect to the sleeve and the parallel pipe section, so the vibrations are absorbed and the other parts of the joint The repetitive load against it is relaxed. Also, by providing the elastic sealing separately from the groove position, water leakage does not occur even if twisting or bending force is applied.

[0009]

【Example】

 Next, an example of implementation of the present invention will be described with reference to FIG.

In the drawing, reference numeral 20 denotes a flexible tube made of stainless steel, which is configured by integrally including parallel tube portions 22 and 23 at both ends of a flexible portion 21 having a corrugated cylindrical wall section.

A female connecting fitting 26, in which a cap nut 25 is rotatably attached to the tip of a sleeve 24, is fitted around the outer circumference of one parallel tube portion 22. In this female connection fitting 26, the sleeve 24 is prevented from coming off by the flange 22a at the tip of the parallel pipe portion 22, the mating nipple 27 to be joined is butted against the flange 22a, and the cap nut is screwed onto the outer periphery of the nipple 27. By fitting, the pipe lines are connected.

A sleeve 30 is fitted on the outer periphery of the other parallel tube portion 23. An annular groove 31 is formed on the inner peripheral surface of the sleeve 30, an O-ring 32 is fitted in the groove 31, and the parallel pipe portion 23 is swelled by being pressed from the inner surface side. The ring-shaped ridge 33 is fitted with the O-ring compressed. As a result, the sleeve 30 is immovably fixed to the parallel tube portion 23. In the figure, 34 is an O-ring which is fitted in the annular groove parallel to the annular groove 31 and seals between the sleeve 30 and the parallel tube portion 23.

A cylindrical male connecting fitting 36 integrally having a tapered male screw 35 on the outer circumference is rotatably fitted to the outer circumference of the parallel tube portion 23 on the distal end side of the sleeve 30 in series with the sleeve 30. The male connection fitting 36 is prevented from coming off by a flange 23a at the tip of the parallel pipe portion 23, and the male connection fitting 36 has a fixed length (about 1 cm) between the flange 23a and the sleeve 30. It can slide axially.

An enlarged diameter cylindrical portion 30a is formed at the rear end of the male connection fitting 36, the tip of the sleeve 30 is fitted in the enlarged diameter cylindrical portion 30a, and an O ring 37 hermetically seals between the both. There is. The taper male screw 35 of the male connecting fitting 36 is screwed into the taper female screw on the inner surface of the tip of the mating pipe 38 to connect the pipe line.

The outer periphery of the flexible portion 21 is covered with a blade 40. The blade 40 is formed by knitting fine metal wires into a tubular shape, and both ends of the blade 40 are fixed to the outer circumferences of the sleeves 24 and 30 on the base end side with clasps 41 and 42. In the figure, reference numeral 43 is a protective tube made of synthetic resin and covered on the outermost layer.

In the flexible pipe joint configured as described above, since the male connecting fitting 36 is rotatable, even after the female connecting fitting 26 is connected by tightening the nipple 27, the connecting fitting 36 is mated with the taper female thread of the counterpart. When the male connection fitting 36 is twisted or vibrated in the axial expansion / contraction direction after the connection, it is absorbed by the movement of the male connection fitting 36, and the repeated load on the flexible tube 20 is absorbed. Decrease.

In the above embodiment, the female connecting fitting is attached to one end of the flexible tube 20, but the male connecting fittings 36 are attached to both ends of the flexible tube 20, respectively. Good.

[0018]

[Effect of device]

 As described above, in the flexible pipe joint of the present invention, the male connecting metal fitting having the tapered male screw on the outer periphery is rotatably attached to the end of the flexible pipe, so that the flexible connecting pipe can be flowed without turning. Since it is possible to connect roads, the range of use and work procedures can be widened, and it is possible to cope with various sites and work conditions. The movement absorbs the vibration applied after the passages are connected, and high durability can be obtained even with the flexible pipe made of a hard stainless steel material.

Further, since an elastic seal ring is provided between the inner surface of the sleeve and the parallel pipe portion in addition to the inside of the concave groove, high water tightness can be obtained even when bending or twisting force is applied.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view showing an embodiment of a flexible pipe joint of the present invention with a lower half thereof being longitudinally cut.

FIG. 2 is a half sectional view of a conventional example.

[Explanation of symbols]

 20 flexible pipe 21 flexible part 22,23 parallel pipe part 22a, 23a flange 24, 30 sleeve 25 cap nut 26 female connection fitting 27 nipple 30a diameter expansion cylinder part 31 annular groove 32, 34, 37 O-ring 33 ridge 35 Taper male screw 36 Male connecting metal fitting 38 Counterpart tube 40 Blade 41, 42 Clasp 43 Protective tube

Claims (2)

[Scope of utility model registration request] 1. A flexible pipe joint comprising a parallel pipe portion integrally formed at both ends of a flexible portion formed by a tubular wall having a corrugated cross section, and each parallel pipe portion provided with a connection fitting with a screw. A sleeve is fitted to the outer periphery of at least one of the parallel pipes, and an annular ridge on the outer surface of the parallel pipe is tightly fitted in an annular groove on the inner surface of the sleeve with an elastic seal ring interposed. A male connecting fitting having a tapered male screw on the outer circumference is fitted to the parallel pipe portion on the distal end side of the sleeve so as to be rotatable and slidable in the axial direction, and the male connecting fitting has a flange at the tip of the parallel pipe portion. An expanded diameter portion is provided at the rear end of the male connection fitting to prevent the sleeve from slipping off, and an elastic seal ring is interposed between the inner surface of the expanded diameter portion and the outer peripheral surface of the sleeve. Flexible pipe fittings. 2. The flexible tube according to claim 1, wherein an elastic seal ring different from the elastic seal ring in the annular groove is interposed between the inner surface of the sleeve and the outer surface of the parallel tube in parallel arrangement with the groove. Fittings.