JP2527857Y2 - Connection device for metal tube and synthetic resin tube with sheath tube - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for connecting a metal tube and a synthetic resin tube with a sheath tube. More specifically, the present invention connects a metal tube and a synthetic resin tube and extrapolates the sheath tube to the synthetic resin tube. The present invention relates to a connecting device for preventing a synthetic resin tube from being bent or damaged.

[0002]

2. Description of the Related Art Conventionally, when a metal pipe and a synthetic resin pipe are connected, a different pipe joint in which a synthetic resin short pipe is joined to a short metal pipe is interposed between both ends of the pipe. The metal short pipe and the metal pipe of the dissimilar pipe joint were mechanically joined, and the synthetic resin short pipe and the synthetic resin pipe were fusion-joined.

However, in the case of this pipe connection,
Since the outer peripheral surface of the synthetic resin tube connected to the metal tube is exposed and not protected, there is a problem that the synthetic resin tube is easily damaged. In particular, when transporting gas, oil, etc. by connecting the piping equipment installed on the quay and the ship anchored at sea with synthetic resin pipes, the synthetic resin pipes immersed in or under the sea are supported. There was a danger of bending and breaking because it was not done. Therefore, it has been practiced to extrapolate the sheath tube to the synthetic resin tube to prevent deformation, breakage, etc. of the synthetic resin tube. In this case, the metal tube connecting the end of the sheath tube to the synthetic resin tube is used. The problem was how to connect to the tube.

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problem, and can easily and reliably connect a metal pipe and a synthetic resin pipe and a sheath pipe extrapolated to the synthetic resin pipe and the metal pipe. To provide a connection device.

[0005]

SUMMARY OF THE INVENTION A connecting device according to the present invention is a dissimilar type in which a synthetic resin short pipe is joined to a metal short pipe with a flange between a metal pipe having a small-diameter flange at the pipe end and a synthetic resin pipe. With the pipe joint interposed, the flange of the different pipe joint and the small diameter flange of the metal pipe are connected by bolts and nuts, and the synthetic resin short pipe and the synthetic resin pipe are fusion-bonded. On the other hand, the sheath tube is extrapolated to the different type pipe joint and the synthetic resin tube, and the loose flange is engaged with the back surface of the flange provided at the end of the sheath tube. Further, the flanges of both ends are connected by bolts and nuts with a flange joint at both ends interposed between a large diameter flange provided behind the small diameter flange of the metal tube and a flange of the sheath tube. Things.

[0006]

According to the above construction, a metal pipe and a synthetic resin pipe are connected via a different type pipe joint, and a sheath pipe extrapolated to the synthetic resin pipe and the different type pipe joint and the metal pipe are connected to a flange joint at both ends. Is firmly connected via Then, the synthetic resin tube is protected by the extrapolated sheath tube.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front half sectional view of a connection device showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of a double-ended flange joint.

The connecting device of the present invention comprises a metal pipe 1, a dissimilar pipe joint 2, a synthetic resin pipe 3, flange joints 4 at both ends, and a sheath pipe 5.

The metal pipe 1 is made of a steel pipe, a cast iron pipe, or the like, and has a small-diameter flange 11 provided at an end of the pipe.
2 is provided. The small diameter flange 11 and the large diameter flange 12 are provided with through holes for inserting bolts at predetermined positions.

The dissimilar pipe joint 2 is formed by integrally joining a short metal pipe 21 and a short synthetic resin pipe 3a. Short metal tube 21
Has a small-diameter flange 11 provided at an end of the metal tube 1.
A flange 22 having the same size as that of the above is provided, and an enlarged diameter portion 23 is provided at the other end. One end of the synthetic resin short tube 3a is fitted into the enlarged diameter portion 23, and the outer peripheral surface of the synthetic resin short tube 3a is pressed by the metal sleeve 24 pressed into the inner peripheral surface thereof. And watertight. The synthetic resin short tube 3a is made of the same kind of synthetic resin as the flexible synthetic resin tube 3, and a short tube made of a synthetic resin such as a soft vinyl chloride resin, polyethylene, or polypropylene can be used. .

The double-ended flange joint 4 has a flange 42 having the same outer diameter as the large-diameter flange 12 of the metal tube 1 protruding from both ends of a metal cylindrical body 41. Is connected to a conducting tube 43. This double-ended flange joint 4 is preferably formed so as to be divided into two parts in the radial direction as shown in a perspective view in FIG. 2 so that the divided bodies 4a and 4b can be assembled. If the double-ended flange joint 4 is formed in a half-split structure in this way, even when the small-diameter flange 11 of the metal pipe 1 and the flange 22 of the dissimilar pipe joint 2 are connected at the time of piping connection described later, each divided body 4a is formed. , 4b can be connected to connect the large-diameter flange 12 of the metal tube 1 and the end of the sheath tube 5 via the flange joints 4 at both ends. The conducting pipe 43 is for taking in and exhausting air between the synthetic resin pipe 3 and the sheath pipe 5 after the pipe connection, and prevents the temperature of the synthetic resin pipe 3 from rising due to the circulation of the air. be able to.

The sheath tube 5 is made of a flexible synthetic resin tube such as a soft vinyl chloride resin, polyethylene, or polypropylene, and has an inner diameter slightly larger than the outer diameter of the synthetic resin tube 3. I have. A first enlarged diameter portion 51 is formed at an end of the sheath tube 5, and a second enlarged diameter portion 52 is formed at the end of the sheath. A flange 53 is formed at an end of the second enlarged-diameter portion 52, and a loose flange 54 is provided on the back surface of the flange 53.
Is locked.

The inner diameter of the first enlarged diameter portion 51 is slightly larger than the outer diameter of the enlarged diameter portion 23 of the dissimilar pipe joint 2, and the inner diameter of the second enlarged diameter portion 52 is The diameter is slightly larger than the outer diameter. When the first enlarged diameter portion 51 and the second enlarged diameter portion 52 are formed at the end of the sheath tube 5 as described above, the different type pipe joint 2 is inserted into the enlarged diameter portions 51 and 52 at the time of pipe connection. Since it can be pulled in, even after the dissimilar pipe joint 2 is connected to one end of the synthetic resin pipe 3, the same dissimilar pipe joint 2 as described above can be easily connected to the other end of the synthetic resin pipe 3.

Next, a procedure for connecting the synthetic resin tube 3 and the sheath tube 5 to the metal tube 1 using this connecting device will be described. First, a sheath tube 5 having a predetermined length and a synthetic resin tube 3 having a length approximately twice as long as the length of the dissimilar pipe joint 2 smaller than the length of the sheath tube 5 are prepared. Is inserted into the sheath tube 5.

Therefore, one end of the synthetic resin tube 3 is projected from one end of the sheath tube 5, and the end of the synthetic resin short tube 3a of the dissimilar pipe joint 2 is fusion-bonded to the end of the tube. At this time, it is important to connect the other pipe joint 2 to the other end of the synthetic resin pipe 3. This connection operation is performed by connecting the different kind pipe joint 2 connected to one end of the synthetic resin pipe 3 to the enlarged diameter portions 51, 52 of the sheath pipe 5.
And the other end of the synthetic resin tube 3 is made to protrude from the other end of the sheath tube 5.
Should be connected.

Next, the flange 22 of the dissimilar pipe joint 2 connected to one end of the synthetic resin pipe 3 and the small-diameter flange 11 of the metal pipe 1 abut against each other. And using a nut.

Therefore, the metal pipe 1 and the sheath pipe 5 are connected by using a double-ended flange joint 4 having a half-split structure or using a double-ended flange joint 4 which has been extrapolated to the synthetic resin pipe 3 in advance. That is, a seal packing is interposed between the large-diameter flange 12 of the metal pipe 1 and one flange 42 of the flange joint 4 at both ends, and both are connected using bolts and nuts.
Next, a seal packing is interposed between the other flange 42 of the both-end flange joint 4 and the end face of the sheath tube 5, and the flange 42 and the loose flange 54 are connected using bolts and nuts. Thus, the connection between the respective ends of the synthetic resin tube 3 and the sheath tube 5 and the metal tube 1 is completed.

On the other hand, the connection between the other end of each of the synthetic resin tube 3 and the sheath tube 5 and the other metal tube 1 is not particularly different from the connection procedure described above. The large-diameter flange 12 and the end of the sheath tube 5 are preferably connected by using a double-ended flange joint 4 having a half-split structure.

[0019]

As described above, the connecting device of the present invention connects a metal pipe and a synthetic resin pipe through different kinds of joints,
In addition, since the sheath pipe extrapolated to the synthetic resin pipe and the different pipe joint and the metal pipe are connected via the flange joints at both ends, the connecting operation can be easily performed and a strong joint can be obtained. Since the synthetic resin pipe is protected by the extrapolated sheath pipe, the synthetic resin pipe is used even when the synthetic resin pipe with the sheath pipe is used as an offshore transport pipe or a transport pipe in a mountainous area where piping conditions are severe. Is not bent or damaged.

[Brief description of the drawings]

FIG. 1 is a front half sectional view of a connection device showing one embodiment of the present invention.

FIG. 2 is a perspective view showing one embodiment of a double-ended flange joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Dissimilar pipe joint 3 Synthetic resin pipe 4 Both ends flange joint 5 Sheath pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiromi Yamada 5-373 Kita 4-Jo Higashi, Chuo-ku, Sapporo City Inside Hokkaido Gas Co., Ltd. (56) Reference Jikken 52-14248 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A short metal pipe (21) with a flange (22) between a metal pipe (1) having a small-diameter flange (11) at the pipe end and a synthetic resin pipe (3). (3a)
And a flange (22) of the heterogeneous pipe joint (2) and a small-diameter flange (11) of the metal pipe (1) are connected by bolts and nuts, and combined. The resin short pipe (3a) and the synthetic resin pipe (3) are fusion-bonded, while the sheath pipe (5) is extrapolated to the heterogeneous pipe joint (2) and the synthetic resin pipe (3). The loose flange (54) is locked on the back of the flange (53) provided at the end of 5),
Further, a flange joint (4) at both ends is interposed between a large-diameter flange (12) provided at a position behind the small-diameter flange (11) of the metal pipe (1) and a flange (53) of the sheath pipe (5). A connection device for a metal tube and a synthetic resin tube with a sheath tube, wherein each flange is connected by a bolt and a nut.