JP3051839B1 - Telescopic and flexible insulated pipe fittings - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To prevent loosening of a screw of a cap nut caused by bulging of a cap nut when a stainless steel pipe is pulled, in a telescopic and flexible insulated pipe joint buried underground, and a screw. Is to prevent the screw from being twisted due to excessive tightening. A first annular flange (122) extending in the circumferential direction is provided adjacent to a male screw (111) at the other end of a joint body (110). Provide a second annular flange (124) that extends, and
14) is screwed into the joint body (110) and tightened so that the opposed flanges are aligned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic and flexible insulated pipe joint and a cap nut. In general, this type of pipe joint or cap nut is used for outdoor plumbing buried underground where water supply equipment, particularly, earthquake resistance and flexibility are required.

[0002]

2. Description of the Related Art A large number of stainless steel pipes from a bronze saddle tap at a branch from a water distribution pipe or a water supply pipe extending under the road under a road to a bronze gate valve in a meter yard in a residential area. Etc. extend through several telescopic and flexible insulated fittings. Since the bronze valve and the stainless steel pipe are insulated by the joint body and the cap nut injection-molded with synthetic resin, no potential difference occurs between the bronze valve and the stainless steel pipe. Therefore, corrosion due to electric current does not occur.

As is well known, cap nuts made of synthetic resin,
The tapered inner peripheral surface is reinforced with a frustoconical core made of stainless steel plate. This is because, during use of the telescopic and flexible insulated pipe joint, when the stainless steel pipe is pulled and comes out of the cap nut, the ball of the ball race hits the inside of the cap nut and the cap nut is broken.

A conventional telescopic and flexible insulated pipe joint shown in FIG. 9 has a cylindrical joint body 10 made of a synthetic resin having a female thread 11 at one end and a male thread 12 at the other end, and another joint body. A synthetic resin or stainless steel cap nut 14 having a female screw 14b to be screwed to the male screw 12 at the end and having a tapered inner peripheral surface 14a tapering outward along the pipe joint axis; Tube pull-out preventing means arranged in an annular recess 16 formed between the outer peripheral surface of the stainless steel pipe 5 inserted into the tapered inner circumferential surface 14a of the tube. And a ball race 17 made of an elastic material.

[0005] After the female screw 14b of the cap nut 14 is screwed into the male screw 12 of the pipe joint body 10 of this structure and tightened, when an external force is applied to pull out the stainless steel pipe 5, it is tightened to a certain value. If the ball 18 exceeds the value, the ball 18 separates from the circumferential groove 5 'of the stainless steel pipe, and the ball race 17 and the ball 1
8 together with the inner peripheral surface 14a of the cap nut 14 and the stainless steel pipe 5
A wedge effect occurs between the outer peripheral surface of the stainless steel pipe and the wedge effect is increased when the drawing is continued. Thus, the drawing of the stainless steel pipe is prevented with a certain specified range of drawing load, and the drawing force is within this range. When the maximum value is exceeded, the stainless steel pipe 5 is pulled out of the pipe joint.

However, the cap nut and the joint body are tightened by so-called triangular screws. However, when the stainless steel pipe 5 is pulled, a wedge effect occurs between the ball 18 and the tapered inner peripheral surface 14a of the cap nut 14 when the stainless steel pipe 5 is pulled. A radially outer force acts to cause the cap nut 14 to inflate, so that the screw of the cap nut 14 and the joint body 1
The gap between the 0 threaded portions is loosened, and the cap nut 14 is easily pulled out. Also, the stainless steel pipe 5 is pulled, and the cap nut 1
When the cap nut 14 is removed from the cap nut 14, the cap nut 14 is cracked due to the deformation of the stainless steel core on the inner surface of the cap nut 14. Also, in order to prevent this loosening, there is a tendency that the screw is overtightened and the screw is twisted.

[0007] Even if the screw does not break, the wedge effect of the screw and the elongation characteristics of the resin are matched to easily cause "galling", and it is difficult to loosen with a much larger force than the tightening torque. There are many cases where it is impossible or impossible to loosen (remove).

[0008]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to prevent loosening of a cap nut screw caused by bulging of a cap nut caused when a stainless steel pipe or the like is pulled, and to prevent the screw from being overtightened by overtightening the screw. Prevent torsion and eliminate the "galling" problem after fastening. And to reinforce the cap nut.

[0009]

According to the present invention, a first annular flange extending circumferentially adjacent to a male screw at the other end of the joint body is provided according to the present invention. Is provided by providing a second annular flange extending in the circumferential direction at a position opposed to the second annular flange.

Further, in the telescopic and flexible insulated pipe joint according to the present invention, when the male screw of the joint main body and the female screw of the cap nut are screwed together, stoppers which respectively abut against the male screw side end and the female screw side end are provided. It is characterized by having been provided.

In the present invention, the end side is used for the male screw and the start side is used for the female screw. Further, the telescopic and flexible insulated pipe fittings according to the present invention,
A plurality of annular circumferential ribs are provided at intervals on the outer peripheral surface of the tapered side opposite to the cap nut female thread to prevent breakage due to bulging of the cap nut when the stainless steel pipe is pulled.

In addition, the telescopic and flexible insulated pipe joint according to the present invention forms an annular space having a predetermined depth opening at the end face of the female screw side end of the joint body, and a metal ring is formed in the annular space. Is inserted.

For the synthetic resin component used in the present invention, for example, a synthetic resin material reinforced with glass fiber can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail by embodiments with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a telescopic and flexible insulating pipe joint according to the present invention for connecting a stainless steel pipe to an underground or ground bronze water supply valve.

In FIG. 1, a cylindrical joint body 110 (FIGS. 2, 3, and 4) made of synthetic resin is combined with a cap nut 114 (FIGS. 5, 6, and 7) made of synthetic resin or stainless steel. The joint body 110 has a natural or artificial rubber packing 113 mounted between the tapered inner peripheral surface 110 a on the male screw 112 side and the outer peripheral surface of the stainless steel pipe 5. The male screw 112 of the joint body 110 has a cap nut 114.
Are screwed between the axial end faces of the packing 113 and the joint main body 110 and the inner step of the cap nut 114 with a cover 115 made of a synthetic resin material interposed therebetween. Cover 115
Is mounted to reduce the frictional resistance when tightening the cap nut 114 and to enhance the adhesion of the packing 113.

The tapered inner peripheral surface 114a of the cap nut 114
A well-known pipe pull-out preventing means is provided in an annular recess 116 formed between (FIG. 7) and the outer peripheral surface of the stainless steel pipe 5 inserted into the pipe joint. This pipe pull-out prevention means
The ball race 117 includes a cylindrical ball race 117 made of an elastic material such as rubber or synthetic resin, and a number of balls 118 arranged in the circumferential direction on the ball race 117. The ball race 117 further includes a tube pull-out preventing means. In order to protect the cover 115 from the cover 115, a seal ring 119 is formed integrally with the end facing away from the cover 115.

In the telescopic and flexible insulated pipe joint according to the first aspect of the present invention, as shown in FIG. 1, a first annular flange 124 is formed in the circumferential direction adjacent to the male screw 112 at the other end of the joint body 110. And a second flange 122 extending in the circumferential direction is provided at a position facing the first annular flange 124 when the cap nut 114 is screwed into the male screw 112 at the other end of the joint main body 110. .

Further, in the telescopic and flexible insulated pipe joint according to the second aspect of the present invention, the external thread 112 of the joint body 110 is provided.
When the female screw of the cap nut 114 is screwed together,
A stopper 112 '(FIGS. 2, 3, and 4) provided at the end of the male screw 112 and a stopper 114b' (FIGS. 6 and 7) provided at the end of the cap nut 114 on the side of the female screw 114b (FIG. 7).
Are provided so as to abut each other.

Further, in the telescopic and flexible insulated pipe joint according to the third aspect, as shown in FIG. 7, an annular circumferential surface is formed on the tapered inner peripheral surface of the synthetic resin cap nut 114 on the side opposite to the female screw portion 114b. A plurality of directional ribs 120 are spaced apart from each other to increase the strength of the cap nut 114.

[0021]

According to the structure of the first aspect, the joint body 110 is provided.
The stainless steel pipe 5 is pulled by increasing the strength against deformation in the circumferential direction of the cap nut 114 and screwing the cap nut 114 into the joint body 110 to tighten the opposed flanges 122 and 124. Sometimes, it is possible to prevent the screw portion 114b of the cap nut 114 from expanding and the screw from easily coming off.

According to the second aspect of the present invention, the eye mark 112
It is possible to prevent twisting even when the tightening torque is overloaded such that a is ignored, and it is also possible to prevent the problem of "galling" after tightening.

According to the configuration of claim 3, the strength is increased by the circumferential rib of the cap nut, so that the cap nut 114 can be prevented from being broken due to bulging when the stainless steel pipe is pulled.

Furthermore, in the case of the telescopic and flexible insulated pipe joint according to the fourth aspect, the synthetic resin joint body 110 connected to the tapered male thread at the connection port of the bronze water supply valve is preferably a female threaded tapered female thread 111. As the resin joint body 110 is tightened with the water supply valve, the tapered female screw 11
As shown in FIG. 1, an annular space 126 having a predetermined depth is formed in the end face of the female screw side end of the joint main body 110 so as to prevent this from expanding. A metal ring 128 is attached to 126.

According to the structure of the fourth aspect, when the joint body 110 made of synthetic resin is tightened, the tapered female screw 11 is formed.
1 can be prevented from swelling. At the same time, by providing the annular space 126, it is possible to prevent molding defects that are likely to appear at places where the wall thickness changes.

[Brief description of the drawings]

1 is a longitudinal sectional view of a telescopic and flexible insulated pipe fitting according to the present invention used to connect a stainless steel pipe to an underground or above ground bronze valve of a water supply facility.

FIG. 2 is a perspective view of the male screw of the coupling body, which is brought into contact with the stopper at the end of the female thread of the cap nut when the male screw and the female screw of the cap nut are screwed together. It is a longitudinal cross-sectional view which shows the stopper of a side end part.

FIG. 3 is a partial view showing an arrangement of a stopper and a matching mark as viewed from the direction of arrow III in FIG.

FIG. 4 is a diagram showing an arrangement of a stopper and a matching mark when viewed from the direction of arrow IV in FIG. 2;

FIG. 5 is a side view showing the arrangement of mating marks provided on the outer peripheral surface of the cap nut.

FIG. 6 is a plan view showing a stopper and a matching mark as viewed from an arrow VI in FIG. 5;

FIG. 7 is a vertical cross-sectional view showing a stopper at the end of the female thread of the cap nut on which the threaded portion starts engaging.

FIG. 8 shows a metal ring mounted in the space at the end of the joint body to prevent bulging of the internal thread at the end of the joint body.

FIG. 9 is a longitudinal sectional view of a conventional telescopic and flexible insulating pipe joint.

[Explanation of symbols]

 5 Stainless Steel Pipe 110 Fitting Body 111 Female Thread of Fitting Body 112 Male Thread of Fitting Body 112 'Male Thread Side Stopper of Fitting Body 114 Cap Nut 114a Tapered Inner Surface 114b Female Thread of Cap Nut 114b' Female Thread Stopper of Cap Nut 116 Annular Concave Places 117, 118 Tube pull-out preventing means 120 Circumferential rib 122 First annular flange 124 Second annular flange 126 Annular space 128 Metal ring

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-122453 (JP, A) JP-A-8-326968 (JP, A) JP-A-3-104592 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F16L 19/08 F16L 25/02 F16L 27/00

Claims (4)

(57) [Claims] 1. A tubular joint body made of synthetic resin having a female thread at one end and a male thread at the other end, a female thread to be screwed into a male thread at the other end of the joint body, and a pipe joint shaft center. Formed on or between the metal core taper inner peripheral surface of the synthetic resin cap nut and the outer peripheral surface of the stainless steel pipe etc. inserted into the pipe joint, with a metal core having a tapered inner peripheral surface tapering along Pipe pull-out preventing means arranged in an annular recess, wherein said pipe pull-out preventing means comprises a ball and a ball race made of a cylindrical elastic material. A first annular flange extending in the circumferential direction is provided adjacent to the external thread at the other end of the joint body, and when the cap nut is screwed into the external thread at the other end of the joint body, the first annular flange faces the first annular flange. Position circumferentially extending to the position A telescopic and flexible insulated pipe joint comprising two annular flanges. 2. A tubular joint body made of synthetic resin having a female thread at one end and a male thread at the other end, and a female thread to be screwed to a male thread at the other end of the joint body, and is provided at the pipe joint axis. Along with a synthetic resin cap nut having a metal core having a tapered inner peripheral surface that tapers outwardly, and a stainless steel inserted into the metal core taper inner peripheral face of the cap nut and the pipe joint. Pipe pulling prevention means disposed between the outer peripheral surfaces of the steel pipes or in annular recesses formed therein,
The pipe pull-out preventing means comprises a ball and a ball race made of a cylindrical elastic material, and in a telescopic and flexible insulated pipe joint, when a male screw of a joint body and a female screw of a cap nut are screwed together, A telescopic and flexible insulated pipe joint characterized in that stoppers are provided for abutting each other on the male screw side end of the joint body and the female screw side end of the cap nut. 3. A tubular joint body made of a synthetic resin having a female thread at one end and a male thread at the other end, a female thread to be screwed to a male thread at the other end of the joint body, and a pipe joint having an axial center. A synthetic resin cap nut having a metal core having a tapered inner peripheral surface tapering toward the front, and a metal core taper inner peripheral surface of the cap nut and an outer peripheral surface of a stainless steel pipe or the like inserted into a pipe joint. Tube pull-out preventing means disposed in or between the annular recesses formed therein, said pipe pull-out preventing means comprising a ball and a ball race made of a cylindrical elastic material; In a pipe joint, a plurality of annular circumferential ribs are provided at intervals on the outer peripheral surface of the taper on the opposite side of the female thread of the cap nut to prevent breakage due to bulging of the cap nut when a stainless steel pipe or the like is pulled. Did Telescopic and flexible insulated pipe joint characterized. 4. A tubular joint body made of a synthetic resin having a female thread at one end and a male thread at the other end, a female thread to be screwed to a male thread at the other end of the joint body, and a pipe joint shaft center. A synthetic resin cap nut inserted with a metal core having a tapered inner peripheral surface that tapers outwardly along, and a stainless steel pipe inserted into the metal core taper inner peripheral face of the cap nut and a pipe joint Tube pull-out preventing means arranged between or on the outer peripheral surfaces of the pipes, the pipe pull-out preventing means comprising a ball and a ball race made of a cylindrical elastic material. In the flexible insulated pipe joint, an annular space having a predetermined depth and opening outward is formed in the end face of the female screw side end of the joint body, and a metal ring is inserted into the annular space. Telescopic and flexible insulated pipe fittings.