JPS6114787Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a sealing structure for fitting joints of pipes of different diameters, and is particularly applicable to connections where the joints slide due to thermal contraction and thermal expansion, such as pipes that conduct high-temperature gas. This is a proposal for a sealing structure for fitting joints between structured pipes.

Conventionally, as a connection structure for pipes of different diameters that expand and contract due to heat, the one shown in FIG. 1 has been common. The illustrated code 1 is a small diameter inner tube, 2
indicates a large-diameter outer tube, a large-diameter enlarged tube portion 3 is fixed to an extension of the tube end sliding connection portion 2a of this outer tube 2, and is formed between this expanded tube portion 3 and the outer circumferential surface of the inner tube 1. The seal structure is such that the gap S is filled with the following refractory filling. That is, the gap S has a structure in which asbestos powder 4 with a particle size of 10 mm, asbestos powder 5 with a particle size of 30 mm, alumina powder 6, and the required refractory powder 7 are stacked and packed in order from the end of the sliding joint 2a. ing. These conventional seal structures have the following drawbacks.

Because the refractory was packed tightly, it lacked flexibility, and due to the thermal expansion and contraction of the piping and the thermal hardening of the refractory, the refractory joints began to crack, requiring repairs within about six months.

Since the filling method is complicated and requires a large number of man-hours, workers are highly fatigued considering that the work site for this type of product is generally a hot place.

Material costs were high.

This idea was devised for the purpose of overcoming the drawbacks of the conventional seal structure mentioned above, and the inner tube is fitted into the outer tube, which is provided by extending the tube expansion section to the sliding joint at the tube end. In a device in which a sealing material is inserted into the gap between the outer tubes and the outer tubes are slidably connected, refractory powder is stuffed between the end of the outer tube sliding connection portion and the inner tube to extend the outer tube sliding connection portion. Into the gap formed between the tube expansion part and the inner tube, fit a ring-shaped seal main material with a U-shaped cross section made of metal of the same material as each tube body so that the opening direction of the U groove faces downward. At the same time, a ribbon-shaped refractory is attached to the outer circumferential surface of this main material to close the gap that occurs between it and the inner pipe, and a groove widening ring made of the same material as the seal main material is fitted into the above-mentioned U groove of the main material. By adopting a structure that includes the following: The details of the configuration will be explained below based on the drawings.

FIG. 2 is a diagram of 8 sections of a riser pipe of a coke oven, which is a preferred embodiment of the seal structure of the present invention. The bent pipe 9 corresponding to the inner pipe 1 and the downcomer pipe 10 toward the dry main 12 are fitted and connected by a vent cover 11 corresponding to the sliding connection part 2a of the outer pipe 2.

3 and 4 show the seal structure of the present invention in the preferred embodiment described above.・
A ring-shaped seal main material 13 made of the same metal as the outer tube, such as steel, and having a U-shaped cross section (molded from iron with a thickness of about 0.3 mm) is shaped like a U-shaped seal with a downward opening.
Fit it in so that the groove 13a faces downward. This seal main material 13 has a refractory layer 14 on its outer circumferential surface, which is made by wrapping and pasting a ribbon-like asbestos (approximately 50 mm in width).
The gap created between the expanded tube part 3 and the inner tube 1 after the tube is fitted is completely filled to ensure sealing.

In the case of the present invention, the U-groove 1 of the seal main material
A ring 15 made of metal, for example, steel pipe, made of the same material as the inner and outer tubes is tightly fitted into the inner and outer tubes 3a for the purpose of widening the U-groove, thereby creating a wedge effect. Even when 13 is thermally expanded and contracted within the gap S, it is made so that it will not loosen or break at the joint.

In addition, in the case of the present invention, the sliding connection portion 2a of the outer tube
A refractory material 4 made of asbestos powder with a particle size of about 10 mm is packed between the end of the pipe and the inner pipe 1 to directly prevent gas leakage.

According to the seal structure of the present invention having the configuration described above, it is possible to seal the joints of pipes of different diameters, where the fitting parts slide due to thermal expansion and contraction. Excellent sealing performance can be maintained over a period of time, and since the seal main material and ring are used, construction is easy and repairs are easy, and material costs can be reduced significantly.

[Brief explanation of the drawing]

Figure 1 of the drawings is a sectional view showing a conventional seal structure, Figure 2 is a front view of the coke oven riser pipe, and Figure 3 is a cross-sectional view showing a conventional seal structure.
Both Figures 4 and 4 are cross-sectional views of the seal structure of the present invention. DESCRIPTION OF SYMBOLS 1... Inner pipe, 2... Outer pipe, 2a... Sliding joint part of outer pipe, 3... Expansion part of outer pipe, 4... Refractory powder,
13...Seal main material, 13a...U groove, 14...
Refractory layer, 15...Ring, S...Gap.

Claims (1)

[Scope of utility model registration request] An outer tube sliding connection is one in which an inner tube is fitted into an outer tube with an expanded tube extending from the sliding connection at the end of the tube, and a sealing material is inserted into the gap between the inner and outer tubes to allow the sliding connection. Refractory powder is packed between the end of the outer tube and the inner tube, and the gap between the expanded tube and the inner tube, which is formed as an extension of the outer tube sliding connection, is filled with metal made of the same material as each tube. A ring-shaped seal main material with a U-shaped cross section is fitted into the U-groove with the opening direction facing downward, and a ribbon-shaped refractory is attached to the outer peripheral surface of this main material to close the gap between it and the inner tube. and a groove expanding ring made of the same material as the seal main material is fitted into the U-groove of the main material.