JPH08312849A - Separation preventive device for fluid tube - Google Patents

Abstract

PURPOSE: To make it possible to securely connect a steel tube body, having at least its outside surface covered with a resin layer, to another fluid tube without conducting it to the outside. CONSTITUTION: By the intrusion quantity of the end part of a locking piece 15 into a resin layer 26 formed on the outside surface of a fluid tube B being regulated, the end part of the locking piece 15 does not come into contact with the outside surface of a metal tube body 25 in the interior of the fluid tube B and, because the metal tube body 25 in the interior of the fluid tube B is not conductible to the outside through the locking piece 15, electrolytic corrosion, corrosion and the like can be prevented. Furthermore, because locking claws 18 formed at the end of the locking piece 15 are of plural numbers, the fluid tube B can be infallibly locked without partially damaging the resin layer 26 on the outside surface of the fluid tube B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is particularly applicable to a fluid pipe in which a resin pipe made of hard vinyl chloride, nylon or the like is formed on at least the outer surface of a steel pipe and a joint portion of the other fluid pipe. The invention relates to a device for preventing separation of a fluid pipe, which prevents mutual separation of the two.

[0002]

2. Description of the Related Art Conventionally, a device for preventing the fluid pipes from being separated from each other by using a joint portion composed of a receiving portion and an inserting portion of the fluid pipe has been already known, for example, as shown in FIGS. There is a device. In FIG. 8, reference numerals 01 and 02 denote the receiving portion and the inserting portion of the fluid pipes A and B which are connected to each other. The connection is designed to be water-sealed. still,
The fluid pipe B has a rigid and anticorrosion structure, and is made of a steel pipe 010 and a coating resin layer 0 made of nylon or hard vinyl chloride lined on the inner and outer surfaces thereof.
It is composed of 11, 011 '.

A metal fitting 06, which is engaged with the receiving portion 01 via a bolt 05, is fitted to the insertion opening 02 for preventing separation. A plurality of screw holes 07 are formed in the main body of the metal fitting 06 in the circumferential direction, and a locking piece 08 having a locking blade 012 formed at the tip is housed in the screw hole 07. The bolt 09 is pressed in the direction of the center axis of the fluid pipe B.

[0004]

However, when the bolts 09 are tightened too much or the mutual movement of the fluid pipes A and B occurs such that the insertion port 02 is displaced in the direction away from the receiving port 01, the fluid is discharged. Since the outer periphery of the tube B is the coating resin layer 011 made of hard vinyl chloride or the like as described above,
As shown in FIG. 5, the locking blade 012 at the tip of the locking piece 08 bites into the coating resin layer 011 so as to break it.

In such a case, a metal locking piece 08 is mainly used.
The locking blade 012 at the tip of the contact part comes into contact with the outer surface of the steel tube body 010, or the hard vinyl chloride or the like near the locking blade 012 is peeled off to expose the steel outer surface. Therefore, the steel pipe 010 is electrically connected to the outside through the metal locking piece 08 or directly, and the steel pipe 010 is connected.
There was a problem that when the soil was backfilled in the soil, it strayed due to stray current in the outside soil and was corroded by moisture in the soil.

The present invention has been made by paying attention to such problems, and at least a steel pipe whose outer surface is covered with a resin layer is firmly connected to another fluid pipe without being electrically connected to the outside. It is an object of the present invention to provide a device for preventing separation of a fluid pipe that can be connected to the.

[0007]

In order to solve the above-mentioned problems, the device for preventing separation of a fluid pipe according to the present invention has an outer periphery covered with a resin layer in a receiving portion formed at an end of one fluid pipe. The insertion opening of the metal fluid pipe is inserted, the separation preventing member that engages with the receiving portion is externally fitted to the insertion opening, and the locking piece of the separation preventing member is attached to the outer peripheral surface of the insertion opening. A device for preventing separation of fluid pipes, which connects fluid pipes by pressing to each other,
A plurality of locking claws are projected on the lower surface of the locking piece, and the length of the locking claw from the base portion to the tip of the locking claw is shorter than at least the thickness of the resin layer. It is characterized in that it is formed.

In the fluid pipe detachment prevention device of the present invention, it is preferable that the base portion is a nail root of a locking pawl.

In the fluid pipe disengagement prevention apparatus of the present invention, it is preferable that the base portion is an abutting surface on which a locking claw which is a part of the locking piece is not formed.

In the fluid pipe separation prevention device of the present invention, it is preferable that the locking claws are a large number of projections.

The fluid pipe separation prevention device according to the present invention is provided with a packing in the receiving portion formed at the end of one fluid pipe,
It is preferable to provide a water blocking function together with the insertion portion of the inserted fluid pipe.

[0012]

According to the present invention, the amount of bite into the coating resin layer formed on the outer surface of the fluid pipe at the tip of the locking piece is regulated, so that the outer surface of the steel pipe body inside thereof is engaged. Since the tip of the stop piece does not come into contact and the steel tube body inside does not conduct to the outside through the locking piece, electrolytic corrosion and corrosion of the tube body are prevented. Further, since the plurality of locking claws formed at the tip of the locking piece are formed, the fluid pipe can be reliably locked without locally damaging the resin layer on the outer surface of the fluid pipe.

By using the nail root as the base, it is possible to easily set the amount of engagement of the locking claw into the resin layer and to reduce the size of the locking piece.

By using the contact surface, which is a part of the locking piece and does not have the locking claws, as the base portion, the size of the locking piece is increased by the amount of the contact surface, but the bite can be surely controlled. .

If the locking claws are formed of a large number of projections, the rotation of the tubular bodies can be regulated not only in the direction of separation of the tubular bodies.

When a packing is used between the two pipes, since the pipes are elastically connected to each other by the locking piece and the resin layer, the elastic performance of the packing is effectively drawn out and the packing is also flexible. An acceptable water blocking effect can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, 1 and 2 are the receiving portions and the insertion portions of the fluid pipes A and B to be connected. Thus, the receiving portion 1 has a collar 3 at its outer end. 4 is a packing that seals the joint with water. The fluid pipe B is a three-layered fluid pipe made by integrally lining a resin body 26, 26 'made of nylon or hard vinyl chloride on the inner and outer surfaces of a steel pipe body 25. is there. The tube 2
5 and the resin layer 26 are strongly bonded.

In particular, as shown in FIG. 2, reference numeral 5 denotes a ring body (ring) as a detachment preventing member for the tube B, and the insertion portion 2
It is composed of an annular base portion 6 which is fitted to the upper end of the annular base portion 6, an upper receiving portion 7 provided at an upper portion of the annular base portion 6, a lower receiving portion 8 provided at a lower portion of the annular base portion 6, and a locking portion 9.

The annular base portion 6 has an L-shaped cross section, and comprises a vertical wall portion 10 facing the end surface of the receiving portion 1 and an eaves portion 11 facing the flange 3 of the receiving portion 1. The eaves portion 11 enhances the rigidity of the annular base portion 6 and also serves to position the annular base portion 6 by engaging with the collar 3 of the receiving portion.

An outer inner surface 12 of the upper receiving portion 7 is formed in an inclined shape, and a bolt through hole 13 is formed in the upper receiving portion 7.
Is formed, and a bolt described below is inserted therethrough.

The outer inner surface 14 of the lower receiving portion 8 is also formed in an inclined shape like the upper receiving portion 7. The lower receiving portion 8
Is provided at one place in the lower portion of the annular base portion 6, but may be provided in two or more places at appropriate places in the annular base portion 6.

Reference numeral 15 is a locking piece, and 16 is a sliding piece, both of which are housed in the upper receiving portion 7. An outer surface 17 of the locking piece 15 is formed in an inclined shape, and a plurality of locking claws 18 that engage with the insertion portion 2 are provided on the lower surface. Further, the sliding piece 16 has an upper surface 19 and a lower surface 20 which are formed as inclined surfaces substantially corresponding to the outer inner surface 12 of the upper receiving portion 7 and the outer surface 17 of the locking piece 15, respectively. Is formed with a through hole 21.

Reference numeral 22 denotes a fastener, which is composed of a bolt 23 and a nut 24. The bolt 23 is inserted into the through hole 21 of the sliding piece 16 and the bolt through hole 13 of the upper receiving portion 7,
The bolt head 23 'is engaged with the flange 3 of the socket. The nut 24 is screwed into the threaded portion of the bolt 23 and abuts on the end surface of the sliding piece 16, and the threaded insertion causes the sliding piece 16 to move to the upper receiving portion 7.
And push it forward.

Reference numeral 15 'is a locking piece housed in the lower receiving portion 8, and its upper surface (outward in the radial direction) is formed as an inclined surface which coincides with the outer inner surface 14 of the lower receiving portion 8. The locking pieces 15 and 15 'have almost the same standard.

Here, the respective locking pieces 15, 1 of the first embodiment.
The size of the locking claw 18 of 5'is defined, and the claw root 180 and the claw tip 18 of the locking claw 18 of each locking piece 15, 15 'are specified.
The distance h from 1 is set to be shorter than the wall thickness m of the resin layer 26, that is, m> h. Of course, it is not necessary for all the distances h between the nail roots 180 and the nail tips 181 to satisfy this condition, and at least one position may satisfy the condition.

In the fluid pipe separation prevention device of the embodiment of the present invention thus constructed, the nut 24 is tightened,
By pushing the sliding piece 16 inward of the upper receiving portion 7, as shown in FIGS. 3 to 4, the tips of the plurality of locking claws 18 formed on the lower surface of the locking piece 15 are connected to the fluid pipe B. Resin layer 26
By digging into the outer surface and being strongly pressed toward the center of the pipe, the fluid pipes A and B are connected to each other and the separation is prevented.

Even if the locking piece 15 is further pressed from this state through the nut 24, as shown in FIG. 4, the length h of the locking claw 18 is equal to the thickness of the resin layer 26. Since it is shorter than m, the nail root 180 blocks the bite, and the nail tip 181 does not reach the outer peripheral surface of the tubular body 25 made of steel.

As a result, even if the fluid pipes A and B are backfilled in the soil after being connected, the steel pipe body 25 conducts to the outside soil through the locking piece 15 made of metal or the like. Therefore, the steel pipe 25 is prevented from being electrolytically corroded by stray electric current in the soil or corroded by water.

As described above, a plurality of locking claws 18 shorter than the thickness of the resin layer 26 are formed on the lower surface of the locking piece 15 forming a surface in the longitudinal direction of the axial direction of the fluid pipe B, whereby the locking claws are formed. 18
Since the amount of biting into the resin layer 26 is reliably regulated by the contact between the outer peripheral surface of the resin layer 26 and the nail roots 180 of the locking pieces 15, the locking claws 18 bite excessively deeply and become steel. There is no possibility of coming into contact with the outer surface of the tubular body 25 made of resin or cutting the resin layer 26.

Further, as described above, the force is locked in the longitudinal direction of the axial direction of the fluid pipe B, that is, in the longitudinal direction of the force for displacing the insertion portion 2 of the fluid pipe B away from the receiving portion 1 of the fluid pipe A. Piece 1
5 is formed and a plurality of locking claws 18 are formed on the lower surface thereof, the force applied to each locking claw 18 is dispersed with respect to the displacement force, so that the resin layer 26 is locally damaged. Therefore, the tubular body 25 made of steel will not be exposed to the outside.

In the present invention, unlike the case where the metal pipe is engaged with the metal locking claws made of metal, the locking claws 18 are slightly different from the steel tube body 25 while holding the resin layer 26. It is possible to move.

That is, in the case of metal-to-metal connection, if a local or strong load is applied and the locking claw is once disengaged from the metal pipe body, the connection force will be lost, causing pipe separation. In the case of the present invention, since the pipes are elastically coupled to each other by the locking claw 18 and the resin layer 26, even when a local or strong load is generated, the both are allowed to move and the coupling force is increased. It can be maintained for a long time. In addition, the degree of freedom of bending at the joint is increased.

FIG. 5 shows a locking piece 15 of the device for preventing separation of a fluid pipe according to the second embodiment of the present invention. Flat contact surfaces 27, 27 facing the outer peripheral surface are provided at both ends, one end, or an intermediate portion of the locking claw 18. And at least the distance h'from the contact surface 27 to the tip of the locking claw 18
Is formed to be shorter than the wall thickness m of the resin tube.

In this case, for example, even if the entire length of the locking claw 18 is longer than the wall thickness of the resin tube, the contact surface 27
Is in contact with the outer surface of the resin layer so that the tip of the locking claw 18 does not enter further deeply. Therefore, the locking claw 18
The amount of bite into the resin tube can be set reliably and easily.

FIG. 6 shows another application example of the present invention. In the above-described embodiment, the locking piece 1 which is a separate body by the sliding piece 16 is used.
5 is pressed in the direction of the center of the pipe, in the present embodiment, the locking piece 15 has a split annular body 5 as a separation preventing member.
The locking claw 18 is widely
Are formed. Also in this embodiment, the dimensional conditions of the locking claws described above are applied, and the flange portion 28 of the separation preventing member 5 is
By tightening the bolt 29 and the nut 30 of the above, the same operation and effect as in the previous embodiment can be obtained.

7 (a), (b) and (c), the locking claw 1 is shown.
8 various forms are shown, (a) is a continuous claw 18 of crests, (b) is a discontinuous claw 18, and (c) is a projecting claw 18. .

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.

For example, the shapes of the nail root 180 and the nail tip 181 or the intervals between them can be freely modified so as to have a retaining function, and the detachment prevention member 5 is not limited to the above-mentioned embodiments. Instead, it is obvious that various known shapes can be used.

[0039]

As described above, the present invention has the following effects.

(A) According to the first aspect of the present invention, the amount of bite into the coating resin layer formed on the outer surface of the fluid pipe at the tip of the locking piece is regulated, so that the inside of the steel pipe is made of steel. Since the tip of the locking piece does not come into contact with the outer surface of the pipe body and the steel pipe body inside does not conduct to the outside through the locking piece, electrolytic corrosion and corrosion of the pipe body are prevented. It Further, since a plurality of locking claws are formed at the tip of the locking piece,
The fluid pipe can be securely locked without locally damaging the resin layer on the outer surface of the fluid pipe.

(B) According to the second aspect of the present invention, by using the nail root as the base, it is possible to easily set the amount of biting of the locking claw into the resin layer and to reduce the size of the locking piece.

(C) According to the third aspect of the present invention, by using as the base portion the contact surface on which the locking claw which is a part of the locking piece is not formed, the locking piece corresponding to the contact surface is used. Although it becomes larger, it is possible to reliably control the bite.

(D) According to the fourth aspect of the invention, if the locking claws are formed of a large number of projections, not only the separating direction of the pipes but also the rotation of the pipes can be restricted.

(E) According to the invention of claim 5, when the packing is used between the two pipes, since the pipes are elastically coupled with the locking piece and the resin layer, the elasticity of the packing is increased. A water-blocking effect that effectively draws out performance and allows flexibility is obtained.

[0045]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fluid pipe separation prevention device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is an enlarged sectional view of an essential part corresponding to FIG.

FIG. 5 is a cross-sectional view of essential parts showing a device for preventing separation of a fluid pipe according to a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a device for preventing separation of a fluid pipe according to a third embodiment of the present invention.

FIG. 7 is a perspective view of a main part showing various forms of locking claws.

FIG. 8 is a cross-sectional view of essential parts showing a conventional fluid pipe separation prevention device.

9 is an enlarged cross-sectional view of the main parts of FIG.

[Explanation of symbols]

 1 Receiving Portion 2 Inserting Portion 3 Collar 4 Packing 5 Annular Body (Separation Prevention Member) 6 Annular Base 7 Upper Receiving 8 Lower Receiving 9 Locking 10 Vertical Wall 11 Eave 12 Outer Inner Surface 13 Through Hole 14 Outer inner surface 15 Locking piece 16 Sliding piece 17 Outer surface 18 Locking claw 19 Upper surface 20 Lower surface 21 Through hole 22 Fastener 23 Bolt 23 'Bolt head 24 Nut 25 Tubular body 26, 26' Resin layer 27 Contact surface (base part ) 28 flange portion 29 bolt 30 nut 180 nail root (base portion) 181 nail tip

Claims (5)

[Claims] 1. An insertion part of a metal fluid pipe whose outer periphery is covered with a resin layer is inserted into a receiving part formed at an end of one fluid pipe, and is engaged with the receiving part. A device for preventing separation of fluid pipes, wherein a separation prevention member is externally fitted to the insertion opening, and a locking piece of the separation prevention member is pressed against an outer peripheral surface of the insertion opening to connect the fluid pipes to each other. A plurality of locking claws are provided on the lower surface of the locking piece, and the length of the locking claw from its base to the tip of the locking claw is at least shorter than the thickness of the resin layer. A device for preventing separation of a fluid pipe, the device being formed as described above. 2. The device for preventing separation of a fluid pipe according to claim 1, wherein the base portion is a nail root of a locking pawl. 3. The fluid pipe separation prevention device according to claim 1, wherein the base portion is an abutting surface on which a locking claw that is a part of a locking piece is not formed. 4. The device for preventing separation of a fluid pipe according to claim 2, wherein the locking claw is a large number of protrusions. 5. The packing according to claim 1, wherein a packing is provided in a receiving portion formed at an end of one fluid pipe so as to have a water blocking function together with an insertion portion of the inserted fluid pipe. The fluid pipe separation prevention device as described in (1).