JP3139908B2 - Corrosion protection cap on pipe end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion cap for a pipe end face.

[0002]

2. Description of the Related Art When laying pipes, the pipes are adjusted to have an appropriate length according to the situation of the laying place.
The tip of this tube may need to be cut. When such an incision tube is made, it is proposed to use an anticorrosion cap that seals tightly to the portion of the background from the viewpoint of anticorrosion because the end surface of the tube, which is the cut end of the cut, exposes the background. I have.

[0003] As shown in FIG. 4, the anticorrosion cap 1 has a cap body 2. When the cap body 2 is attached to the end of the cut tube 3, the end of the tube 3 is closed. The tubular portion 4 inserted into the inner periphery and the flange portion 5 formed on the outer periphery of one end of the tubular portion 4 are formed of an elastic body such as rubber integrally formed. The cylindrical portion 4 is formed in a tapered shape so as to open outward as it goes away from the flange portion 5, and an annular packing 6 made of a soft rubber plate or the like is in contact with the flange portion 5 on the cylindrical portion 4. The annular packing 6 is intended to come into close contact with the end face 3a in a compressed state by being fitted in the state and pressing the flange portion 5 against the end face 3a of the pipe 3.

[0004]

However, in the anticorrosion cap 1 having such a conventional structure, since the outer peripheral portion a of the boundary between the end face 3a of the pipe 3 and the annular packing 6 is exposed to the outside, it flows through the pipe. There is a possibility that a fluid or the like invades from the boundary end part a and the anticorrosion function cannot be reliably exerted.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an anticorrosion cap capable of reliably exhibiting an anticorrosion function.

[0006]

According to the present invention, there is provided an anticorrosion cap for a pipe end face according to the present invention, which is in close contact with a cylindrical inner peripheral part inserted into the inner circumference of the end of the pipe. The flange portion and the cylindrical outer peripheral portion that covers the outer periphery of the end of the tube are integrally formed, and the cylindrical inner peripheral portion is opened outward as the distance from the flange portion increases, and extends longer than the cylindrical outer peripheral portion. It is formed in a tapered shape so that the end of the cylindrical inner peripheral portion opposite to the flange portion is larger than the inner diameter of the pipe, and the shaft is formed from the flange portion on the inner peripheral surface of the cylindrical inner peripheral portion. An annular groove having a rectangular cross section is formed at a position spaced apart in the center direction, and is formed in the annular groove by a circumferentially stripped annular flat metal spring material or the like. The stopper ring is fitted.

[0007]

According to the above construction, since the outer periphery of the end of the tube is covered by the cylindrical outer periphery, the intrusion of fluid into the boundary between the end surface of the tube and the flange is prevented, and the anticorrosion function is reliably exhibited. Will be done.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 10 denotes a connecting ring for connecting the cut tubes 11 to each other, and at a position deeper than each open end of the connecting ring 10, the connecting ring is slightly smaller than the outer diameter of the tube 11. Large diameter holes 12 are respectively formed, and these holes 1
2, the ends of the cut tubes 11 are inserted. An annular groove 13 is formed on the inner periphery of the connecting ring 10 at a position deeper than the open end, and the annular groove 13
The annular sealing material 14 compressed between the outer periphery of the end portion of the housing is accommodated.

A flange 15 is formed on the outer periphery of each open end of the connecting ring 10, and through holes 16 are provided in a plurality of positions in the circumferential direction of the flange 15 in the axial direction of the tube. Then, the pressing ring 17 is fitted to the end of the pipe 11 and the screw side thereof is fastened to the flange 15 by the bolt 18 passing through the insertion hole 16.
4 is compressed so that leakage of fluid from the inside of the connecting ring 10 is prevented.

The pipe 11 is made of ductile cast iron or the like, and its inner and outer surfaces are provided with anticorrosion coating or the like.
One end of the pipe 11 is cut at the laying site so as to have a predetermined length as described above, and the end face 11a formed by the cut pipe has an exposed background.

In order to prevent erosion from the end surface 11a of the tube 11, an anticorrosion cap 20 as shown in FIGS. 1 and 3 is attached to the end of the cut tube 11. The anticorrosion cap 20 has a cap body 22. The cap body 22 is provided with a ring-shaped flange portion 23 that is in close contact with the end face 11 a of the pipe 11, and extends to one side from the inner peripheral end of the flange portion 23. A cylindrical inner peripheral portion 24 that is inserted into the inner periphery of the end of the tube 11 and a cylindrical outer periphery that extends to one side from the outer peripheral end of the flange portion 23 and covers the outer periphery of the end of the tube 11 Part 25
Are formed integrally with an elastic body such as rubber.

The cylindrical inner peripheral portion 24 is formed in a tapered shape so as to open outward as it goes away from the flange portion 23, and has a tapered inner peripheral surface 26 corresponding thereto and a tapered outer peripheral surface 27 similarly. Having. The outer diameter of the outer peripheral surface 27 of the cylindrical inner peripheral part 24 is
1 is formed to be slightly smaller than the inner diameter of the tube 11 and at the end opposite to the flange portion 23 to be larger than the inner diameter of the tube 11. An annular groove 28 having a rectangular cross section is formed on the inner circumferential surface 26 of the cylindrical inner circumferential portion 24 at a position spaced apart from the flange portion 23 in the axial direction. A stopper ring 29, which is formed by an annular flat band-shaped metal spring material which is divided in the circumferential direction, is formed so as to be freely opened.

The cylindrical outer peripheral portion 25 is formed in a tapered shape so as to be slightly tapered inward as it goes away from the flange portion 23, and at the end opposite to the flange portion 23, the outer diameter of the tube 11 is larger than the outer diameter of the tube 11. It is formed to be slightly smaller. A tapered surface 30 that gradually tapers toward the end face 11a of the tube 11 is formed at an outer peripheral portion of a connection portion between the flange portion 23 and the cylindrical outer peripheral portion 25. When inserted into the hole 12 of the tenth, the tapered surface 30 guides it.

In the above configuration, when the cut tubes 11 are connected to each other by the connecting ring 10, the anticorrosion cap 20 is attached to the end of the tube 11 prior to this connection operation.

When the anticorrosion cap 20 is attached to the end of the pipe 11, first, as shown in FIG. 3, the cap body 22 is moved between the cylindrical inner peripheral portion 24 and the cylindrical outer peripheral portion 25. Are fitted to the ends of the tube 11 so as to spread each other.
At this time, since the outer diameter of the distal end side of the cylindrical inner peripheral portion 24 is larger than the inner diameter of the tube 11, the cylindrical inner peripheral portion 24 undergoes elastic deformation in the diameter reducing direction, and its outer peripheral surface 27 It is inserted close to the peripheral surface. Further, since the inner diameter of the distal end side of the cylindrical outer peripheral portion 25 is smaller than the outer diameter of the tube 11, the cylindrical outer peripheral portion 25 undergoes elastic deformation in the radially increasing direction and is mounted in a state of being in close contact with the outer peripheral surface of the tube 11. Is done. Also, by mounting the flange 23 so as to press it against the end face 11a of the pipe 11,
The flange portion 23 is in close contact with the end face 11a of the pipe 11.

Thereafter, the stopper ring 29 is manually reduced in diameter and fitted into the annular groove 28, so that the cylindrical inner peripheral portion 24 is formed by the action of the expanding force of the stopper ring 29.
1 is pressed and fixed to the inner peripheral surface.

When the ends of the tubes 11 to which the anticorrosion caps 20 are attached in this way are connected via the connecting rings 10, the pressing rings 17 and the sealing materials 14 are previously fitted to the ends of the respective tubes 11. After that, the end of each pipe 11 is inserted into the hole 12 of the connecting ring 10. At this time, since the tapered surface 30 is formed at the outer peripheral portion of the connection portion between the flange portion 23 and the cylindrical outer peripheral portion 25, the end of the pipe 11 is
The guide is guided into the hole 12 of the connecting ring 10 so that the inserting operation can be easily performed. And finally, the sealing material 14
Is inserted into the annular groove 13 of the connecting ring 10, and the bolt 1
By fastening the pressing ring 17 to the flange 15 of the connecting ring 10 by 8, leakage of fluid from the inside of the connecting ring 10 is prevented by the compressed sealing material 14.

In this case, since the pipes 11 are not directly connected to each other, the fluid in the pipe 11 flows into the connecting ring 10, but the end face 11a of the pipe 11 in which the ground is exposed. Is covered with the anticorrosion cap 20, so that the fluid is prevented from entering the end face 11a of the tube 11. In particular, since not only the end surface 11a and the inner peripheral surface of the end portion of the tube 11 are covered with the anticorrosion cap 20, the outer peripheral surface of the end portion of the tube 11 is also covered by the cylindrical outer peripheral portion 25, so that the anticorrosion function is provided. It can be obtained more reliably.

In the above embodiment, the case where the end of the pipe 11 covered with the anticorrosion cap 20 is connected to the connecting ring 10 has been described. However, the present invention is not limited to this. It goes without saying that the end of the covered tube 11 can be adopted at various joints such as a receptacle as long as it can be inserted and connected without any trouble. Further, in the above embodiment, the cylindrical outer peripheral portion 25 of the cap body 22 is provided.
FIG. 3 shows a case in which the taper is formed so as to be slightly indented as the distance from the flange portion 23 increases, but it may be simply formed so as to extend perpendicularly to the flange portion 23. When mounted on the end of the tube 11, the cylindrical outer peripheral portion 25 may follow the outer peripheral surface of the end of the tube 11.

[0020]

As described above, according to the present invention, since the cylindrical outer peripheral portion covering the outer periphery of the end of the tube is formed in the anticorrosion cap, only the end surface of the tube and the inner peripheral surface of the end are covered by the anticorrosion cap. In addition, the outer peripheral surface of the end of the tube can be covered by the cylindrical outer peripheral portion of the anticorrosion cap. As a result, the fluid in the tube can be reliably prevented from contacting the end surface of the tube, and the anticorrosion function can be further improved. it can. In addition, since the annular packing and the like which have been required conventionally can be omitted, the number of parts and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mounted state of an anticorrosion cap on a pipe end face according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a case where a pipe provided with the anticorrosion cap is connected to a connecting ring.

FIG. 3 is a cross-sectional view illustrating a procedure for mounting the anticorrosion cap.

FIG. 4 is a cross-sectional view showing a state in which a conventional anticorrosion cap is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Connecting ring 11 Pipe 11a End face 20 Corrosion-proof cap 22 Cap main body 23 Flange part 24 Cylindrical inner peripheral part 25 Cylindrical outer peripheral part 28 Annular groove 29 Stopper ring 30 Tapered surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 57/00 F16L 58/00-58/18

Claims (1)

(57) [Claims] 1. A tubular inner peripheral portion inserted into an inner periphery of an end of a tube, a flange portion closely contacted with an end surface of the tube, and a cylindrical outer peripheral portion covering an outer periphery of the end of the tube. formed integrally, a cylindrical inner peripheral portion, it an outwardly opening with increasing distance from the flange portion
And is formed so as to be tapered so as to extend longer than the cylindrical outer peripheral portion, and the end of the cylindrical inner peripheral portion opposite to the flange portion is formed to be larger than the inner diameter of the pipe . Week
Distance from the flange on the inner peripheral surface of the
A circular groove with a rectangular cross section is formed at the position
In the groove, a circular flat strip-shaped metal spring material
The stopper ring which is formed by opening
The anticorrosion cap on the pipe end, which is fitted .