JPH10169863A - Pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connecting structure that facilitate pipe connection work and is sufficiently capable of prevent pipes from coming off. SOLUTION: The insertion section of a metal pipe body 5 to a receiving port 11 is covered by pipe end coating resin material 6 from the inner face to the outer face of the pipe body 5. When the tip section of a pipe 4 is inserted into the receiving port 11, the locking claw 21 of the coming off preventive ring 2 provided in the receiving port 11 is made to cut into the outer cylindrical section 63 of the pipe end coating material 6. The length of the outer cylindrical section 63 of the pipe end coating material 6 is made longer than the set insertion length into the receiving port 11 of the tip 41 of the pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe connection structure.

[0002]

2. Description of the Related Art As a pipe connection structure, instead of a conventional connection method in which a thread is cut on an outer peripheral surface of a distal end portion of a pipe to be connected and a distal end portion of a pipe material is screwed into a thread portion provided on an inner peripheral surface of a socket of a joint. , Having a substantially C-shaped cross section, which is loosely fitted into an engagement groove provided on the inner peripheral surface of the receiving port, expanded at the time of insertion of the distal end of the tube, externally fitted on the outer peripheral surface of the distal end of the tube, and provided on the inner peripheral surface of the C-shape. A locking ring that bites into the outer peripheral surface of the tube tip to prevent the tube from coming off, and a stopper provided on the inner peripheral surface of the receiving port on the back side of the ring to prevent the tube from coming off. A pipe connection structure in which one end of a pipe is inserted into a socket of a joint having a watertight packing for sealing the inside and outside of the pipe in a watertight manner (see Japanese Utility Model Laid-Open No. 5-90080). Has been proposed.

According to this method, it is not necessary to cut a screw on the outer peripheral surface of the pipe tip, and the connection is completed only by inserting the pipe tip into the receiving port, so that the workability on site is excellent. However, when connecting a metal pipe using this connection structure, even if the locking claw of the separation prevention ring is sufficiently inserted,
Since the locking claws do not sufficiently bite into the metal tube, there is also a problem that the detachment prevention force is smaller than that of the conventional screw connection structure.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe connection structure which can be easily connected in view of such circumstances and has a sufficient detachment prevention performance. .

[0005]

In order to achieve the above object, a pipe connection structure according to the present invention has a substantially C-shaped cross section and is loosely fitted into an engagement groove provided on an inner peripheral surface of a receiving port. When the tip of the connected pipe is inserted, the diameter of the pipe expands, and the engaging claw provided on the inner peripheral face of the C-shaped part is fitted to the outer peripheral face of the pipe tip and cuts into the outer peripheral face of the tip of the pipe to remove the pipe material. One end of the pipe is inserted into the receptacle of the joint, which includes a separation prevention ring for preventing leakage, and a watertight packing provided on the inner peripheral surface of the receptacle and in close contact with the outer peripheral surface of the pipe tip to seal the inside and outside of the pipe in a watertight manner. In a pipe connection structure in which the pipe and the joint are connected to each other, the pipe is provided integrally with a metal pipe main body and a distal end portion of the pipe main body, and has a ring-like shape that covers a distal end surface of the pipe main body. A tip surface coating part,
A tubular inner cylinder portion extending from the inner edge of the distal end surface covering portion and fitted inside the distal end portion of the tube main body, and extending from the outer edge of the distal end surface covering portion and fitted outside the distal end portion of the tube main body. Is formed from a resin-made pipe end covering material having a cylindrical outer tubular portion,
The locking claw of the disengagement prevention ring is configured to bite into the outer cylindrical portion.

[0006] In the above configuration, it is preferable that the length of the outer cylindrical portion of the tube end covering material is longer than the set insertion length of the tube tip. The biting angle of the locking claw is preferably 30 ° or more and less than 60 ° with respect to the tube axis.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a connection structure according to the present invention.

As shown in FIG. 1, in this connection structure, a distal end 4 of a pipe 4 connected to a predetermined position of a receiving port 11 of the joint 1 is connected.
By inserting 1, the pipe 4 is connected and integrated with the joint 1. That is, the receiving port 11 has an engagement groove 12 on the inner peripheral surface thereof, the separation prevention ring 2 is loosely fitted in the engagement groove 12, and the waterproof packing 3 is provided in the back of the separation prevention ring 2. I have.

The detachment prevention ring 2 has a substantially C-shaped cross section with a diameter smaller than the outer diameter of the distal end portion 41 of the pipe 4 to be connected. Is provided. The waterproof packing 3 has a rubber ring shape, and its inner peripheral surface is pressed against the outer peripheral surface of the distal end portion 41 of the pipe 4 to which it is connected.

On the other hand, the pipe 4 is composed of a pipe main body 5 made of an inner resin-lined steel pipe and a pipe end coating material (tube end core) 6. The pipe end covering material 6 is attached to the distal end portion of the pipe main body 5, and has a ring-shaped distal end surface covering portion 61 covering the distal end surface of the tube main body 5, and extends from the inner edge of the distal end surface covering portion 61. And a cylindrical outer cylindrical portion 63 that extends from the outer edge of the distal end surface covering portion and is fitted to the outside of the tube main body 5. Through the pipe body 5
It is integrated into.

The outer cylindrical portion 63 has a tapered tip end portion 63a and a length L _1.
There is longer than the set insertion length L ₂ of the tube 4.

Therefore, when the distal end portion 41 of the pipe 4 is pushed into the receiving port 11 from the inlet of the receiving port 11, first, the outer cylindrical portion 63
The diameter of the detachment prevention ring 2 is expanded by the taper of the tip end portion 63 a of the tube 4, so that the tip end portion 41 of the tube 4 can be inserted deep into the detachment prevention ring 2 without being hindered by the detachment prevention ring 2. Further, when pushed in, the water-stop packing 3 provided on the inner side of the separation prevention ring 2 also moves to the distal end portion 63 a of the outer cylindrical portion 63.
And can be inserted to a predetermined position at the back, so that the pipe 4 and the joint 1 are connected.

That is, the distal end portion 41 of the tube 4 reaches a predetermined position.
Is inserted, the retaining claw 21 is prevented from coming off from the receiving port 11 of the pipe 4 by the locking claw 21 being inserted into the outer cylindrical portion 63 of the pipe end covering material 6 by its elastic force. I have.
In addition, since the tube end covering material 6 is formed of resin, the locking claw 21 is easily bite, and in some cases, the locking claw 21 is formed.
Penetrates the outer cylindrical portion 63 and cuts into the outer peripheral surface of the pipe main body 5, so that it is securely prevented from falling off.

Since the length L ₁ of the outer cylindrical portion 63 is longer than the set insertion length L ₂ of the distal end portion 41 of the tube 4, the length of the outer cylindrical portion 63 protruding from the end of the receiving port 11. Looking back, the degree of insertion of the tube 4 can be known, and insufficient insertion can be prevented. Furthermore, since the pipe end of the pipe main body 5 is covered with the pipe end coating material 6, the corrosion of the pipe end of the pipe main body 5 can be achieved without providing an anticorrosion core or the like in the receiving port 11.

FIG. 2 and FIG. 3 show another embodiment of the pipe connection structure according to the present invention. As shown in FIGS. 2 and 3, in this pipe connection structure, the receiving port 7 includes a receiving port main body 71 having a flange 71 a, and a ring-shaped receiving port end member 72 detachable from the receiving port main body 71. Except for the above configuration, the above-described pipe connection structure is used.

That is, the socket main body 71 is
As shown in FIG. 3A, four notches 71b are provided radially, and the water stop packing 3 is provided inside the receptacle main body 71. The receiving pipe end member 72 is
a cylindrical portion 72a having an inner diameter substantially equal to or slightly larger than the outer diameter of the cylindrical portion 72a, four protrusions 72b projecting from one inner circumferential surface of one end of the cylindrical portion 72a and capable of passing through the cutout 71b, and an inner circumferential surface of the other end of the cylindrical portion 72a. A flange 72c that forms the engagement groove 22 of the separation prevention ring 2 between the flange 71a of the receiving port main body 71 and the separation prevention ring 2 is set inside the cylindrical portion 72a. The projection 72b is aligned with the position of the notch 71b of the flange 71a, and the projection 72b is pushed into the socket main body 71 to fit the projection 72b into the notch 71b.
By rotating so that the position of 2b and the position of the notch 71b are shifted, the protrusion 72b is locked to the flange 71a, and is integrated with the socket main body 71. Then, if the projection 72b is adjusted to the position of the notch 71b again, the projection 72b can be easily separated from the socket main body 71.

That is, according to the connection structure using the receiving port 7, in addition to the effect of the connection structure described above, the connection can be established by aligning the protrusion 72b with the position of the notch 71b as described above. This has an effect that the pipe 4 can be easily removed from the joint 1.

The pipe connection structure according to the present invention is not limited to the above embodiment. For example, in the above embodiment, the pipe main body 5 is formed of an inner lining steel pipe, but the present invention can also be used for a connection structure of a normal steel pipe or the like having no lining on the inner surface. In the above embodiment,
Although the receiving pipe end member 72 and the receiving main body 71 are integrated by the fitting type, the receiving pipe end member may be combined with two divided bodies.

Further, in the above-described embodiment, the water-stop packing 3 is provided on the back side of the separation prevention ring 2, but may be reversed.

[0020]

The pipe connecting structure according to the present invention is constructed as described above, so that the connecting operation can be easily performed, and even if the pipe to be connected is made of metal, the pipe connecting structure can be used. Detachment can be reliably prevented.

Further, if the length of the outer tube portion of the tube end covering material is made longer than the set insertion length of the tube tip portion as in claim 2, the outer tube portion from the end of the receiving port is formed. If the protruding length is checked, the degree of insertion of the tube into the receptacle can be determined, and insufficient insertion can be prevented. Therefore, it is possible to prevent the tube from coming off or leaking due to insufficient insertion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pipe connection structure according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the pipe connection structure according to the present invention.

FIG. 3 is an exploded perspective view of a socket used in the connection structure of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint 11 Reception port 2 Separation prevention ring 21 Locking claw 3 Waterproof packing 4 Tube 41 Tip part 5 Tube main body 6 Tube end coating material 61 Tip coating part 62 Inner cylinder part 63 Outer cylinder part 7 Reception port

Claims (2)

[Claims] 1. A tube having a substantially C-shaped cross section, which is loosely fitted into an engaging groove provided on an inner peripheral surface of a receiving port, and is enlarged in diameter when a distal end portion of a connected tube is inserted, and is externally fitted on an outer peripheral surface of a distal end portion of the tube. A locking ring provided on the inner peripheral surface of the C-shaped bite bites into the outer peripheral surface of the tube tip to prevent the tube material from coming off. In a pipe connection structure in which one end of the pipe is inserted and a pipe and a joint are connected to a receiving port of a joint having a watertight packing that seals the inside and outside of the pipe in a watertight manner, the pipe is made of metal. A tube body, and a ring-shaped tip surface covering portion provided integrally with the tip portion of the tube body to cover the tip surface of the tube body, and extending from the inner edge of the tip surface covering portion, inside the tip portion of the tube body. A cylindrical inner cylindrical portion fitted to the tube and a cylindrical shape extending from the outer edge of the distal end surface covering portion and fitted to the outer side of the distal end portion of the tube main body. Pipe connection structure be formed from a resin pipe end dressing having an outer tube portion, the locking pawl of the anti-separation ring is characterized in that it is adapted to bite into the outer cylinder part. 2. The pipe connection structure according to claim 1, wherein the length of the outer cylindrical portion of the pipe end covering material is longer than a set insertion length of the pipe tip into the receptacle.