JPH10288291A - Expansion joint device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge drain to be accumulated in the stop of the operation. SOLUTION: Flanges 12, 15 are attached to respective one ends of two pipe bodes 11, 14 to be used by being incorporated in horizontally arranged pipes 1, and they are joined to flanges 8, 9 of the pipes 1. A straightening plate 13 is attached to the other end of the pipe body 11. A large-diameter cylindrical part 16 is attached to the other end of the pipe body 14. The other end side of the pipe body 11 is inserted into the large-diameter cylindrical part 16, and a cylindrical bellows 17 arranged between them is fixed to the other ends of the large-diameter cylindrical part 16 and the pipe body 11. Fluid flowing in the pipe 1 is allowed to flow from the pipe body 11 to the pipe body 14 by being straightened by the straightening plate 13. When the operation is stopped, inside fluid is allowed to flow from between the pipe bodies 11, 14 into the large-diameter cylindrical part 16 and accumulated as drain on the bottom, and it can be discharged by a drain discharging pipe 18 connected to the large- diameter cylindrical part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint device for a pipe which is attached to the middle of a pipe fixed at a fixed point to absorb thermal expansion and contraction between the fixed points.

[0002]

2. Description of the Related Art Pipes of various plants are fixedly supported at a certain point as a fixed point. However, pipes located between a certain fixed point and another fixed point are thermally expanded and contracted by internal fluid. I do.

A device for releasing the thermal expansion and contraction of the pipe between the fixed points has been studied in the past, and a device for moving a supporting device for supporting the pipe in the middle has been proposed. An apparatus in which an expansion joint device is interposed in the middle of a pipe as shown in FIG. 3 has also been proposed.

That is, in order to absorb the thermal expansion and contraction of the pipe 1 extending in the horizontal direction, the pipe 1 has a flange 3 at one end and is located slightly inside at the other end so as to be interposed in the middle of the pipe 1. The upstream pipe 2 to which the rectifying plate 4 is attached and the downstream pipe 5 having a flange 6 at one end and a bellows 7 concentrically attached to the other end are opposed to each other. The bellows 7 of the downstream tube 5 overlaps the outside of the straightening plate 4 of the tube 2, and the tip side of the bellows 7 is fixed to the tube 2.
The expansion joint device is constructed such that the fluid can be moved in the axial direction, and the flanges 3 and 6 of the expansion joint device are joined to the flanges 8 and 9 of the pipe 1 so as to be incorporated in the middle of the pipe 1 so that the fluid flows through the pipe body. There is one that flows from 2 to the tube 5.

[0005]

However, in the case of the conventional expansion joint device shown in FIG.
Drain 10 accumulates at the bottom of the valley. When the drain 10 accumulates, if the internal fluid is corrosive, the bellows 7
However, if the drain 10 is used in a low-temperature environment and the drain 10 accumulates, the drain 10 freezes and the bellows 7 cannot expand or contract. Therefore, it is necessary to extract the drain 10, and in this case, the tube is put into the pipe 1 and the drain is extracted by vacuum suction, but it takes a lot of time and labor.

Accordingly, an object of the present invention is to provide a pipe expansion joint device that can easily discharge drain accumulated during a stop of operation.

[0007]

According to the present invention, in order to solve the above-mentioned problems, an end of one tubular body and an end of another tubular body are opposed to each other, and a cylindrical bellows is provided therebetween. In a pipe expansion joint device which is attached and connected and incorporated in the middle of a horizontal pipe so as to absorb the thermal expansion and contraction of the pipe, a large-diameter cylindrical portion is provided at one end of the two pipes. Is attached, the tip of another tubular body is inserted into the inside of the large-diameter tubular portion, and a tubular bellows is arranged between the large-diameter tubular portion and the tip of another tubular body. Fixing both ends of the bellows to the inside of the tip of the large-diameter tubular portion and the outside of the tip of another tubular body, connecting the two tubular bodies, and draining the bottom of the large-diameter tubular portion. It is configured to be connected with a bleed tube.

After the operation is stopped, the internal fluid enters the large-diameter cylindrical portion from between the two pipes, and the drain accumulates.
Since the drain collects at the bottom of the large-diameter cylindrical portion, it can be easily extracted from the drain extraction tube.

By making the large-diameter cylindrical portion beveled and connecting a drain pipe to the lowest portion of the bottom portion, the drain can be more easily extracted.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. An upstream pipe 11 having a flange 12 at one end and a straightening plate 13 at a slightly inner position at the other end is provided.
A rectifying plate 13 is formed by horizontally orienting a downstream pipe 14 having a flange 15 at one end and a large-diameter cylindrical portion 16 at the other end so that the flanges 12 and 15 are on the outside. The distal end is inserted into the inside of the tube 14, and the other end of one tube 11 is inserted and positioned concentrically inside the large-diameter tubular portion 16 of the other tube 14. A cylindrical bellows 17 is disposed concentrically between the two ends, and both ends of the bellows 17 are fixed between the inside of the tip of the large-diameter tubular portion 16 and the outside of the other end of one tubular body 11. Then, the pipes 11 and 14 can be freely extended and contracted in the axial direction, and a drain pipe 18 with a drain valve 19 is connected to the lower side of the large-diameter cylindrical portion 16 of the other pipe 14. Then, the drain accumulated in the large-diameter cylindrical portion 16 is drained by opening the drain valve 19 and draining the pipe 18. To let out come.

In FIG. 1, the same components as those shown in FIG. 3 are denoted by the same reference numerals.

When the expansion joint device for a pipe according to the present invention having the above-described structure is incorporated in the middle of the horizontal pipe 1 and used by flange connection, the internal fluid flowing from the pipe 11 to the pipe 14 during operation is rectified. Along the plate 13. At this time, piping 1
Thermal expansion and contraction of the bellows 1 of the pipe expansion joint device of the present invention.
7 can be absorbed by expansion and contraction.

When the operation is stopped, the fluid flowing smoothly to the downstream side along the flow straightening plate 13 is connected to the tip of the flow straightening plate 13 and the pipe 1.
4 enters the large-diameter cylindrical portion 16 through a gap with the inner surface, and accumulates as drain at the bottom of the large-diameter cylindrical portion 16, but does not accumulate at the bottom of the bellows unlike the conventional system shown in FIG. Therefore, the drain collected at the bottom of the large-diameter cylindrical portion 16 of the pipe 14 can be easily discharged by opening the drain valve 19 of the drain pipe 18.

In the above, the large-diameter cylindrical portion 16 of the tubular body 14
Is connected to the lowest portion of the bottom of the large-diameter tubular portion 16, so that the large-diameter tubular portion 16 has a larger diameter toward the tip,
The bottom of the tip of the large-diameter cylindrical portion 16 is made lowest, and the drain pipe 18 is connected to this position. When the large-diameter tubular portion 16 is formed to have a middle height, the drain pipe 18 may be connected to the lowest central portion of the bottom of the large-diameter tubular portion 16.

FIG. 2 shows another embodiment of the present invention, in which a large-diameter cylindrical portion 16 is attached to a tube 11 on the upstream side. That is, the large-diameter cylindrical portion 16 is integrally attached to the other end of the tube 11 having the flange 12 at one end and the rectifying plate 13 at the slightly inner position at the other end, and the flange 15 at one end. Tubes 11 and 14 are inserted so that the other end of tube 14 is inserted inside large-diameter cylindrical portion 16.
, A cylindrical bellows 17 is concentrically arranged between the outside of the tube 14 and the inside of the large-diameter cylindrical portion 16, and both ends of the bellows 17 are connected to the tip of the large-diameter cylindrical portion 16. The pipes 11 and 14 can be freely expanded and contracted by the bellows 17 so that the large-diameter cylindrical portion 1 is fixed.
6, a drain pipe 18 with a drain valve 19 is connected to the lowest position at the bottom.

Also in this embodiment, the horizontal piping 1
Can be absorbed by the expansion and contraction of the bellows 17 even if drainage accumulates in the large-diameter cylindrical portion 16 after the operation is stopped. be able to.

In each of the above embodiments, the case where the flanges 12 and 15 are provided at one end so that the flange 12 is attached to the horizontal pipe 1 has been described.
Of course, the pipes 11 and 14 and the pipe 1 may be joined by butt welding without the 15 and various changes may be made without departing from the scope of the present invention.

[0019]

As described above, according to the expansion joint device for pipes of the present invention, in a configuration that is used by being incorporated in the middle of a horizontal pipe between fixed points, the thermal expansion and contraction of the horizontal pipe is absorbed. The bellows to be connected to the end of one tube and the other
Position both ends of the bellows on the two pipes by positioning them between the large-diameter pipes attached to the ends of the two pipes, and connect a drain pipe to the bottom of the large-diameter pipe at the bottom. Because of the configuration, the thermal expansion and contraction of the piping during operation can be absorbed by displacing the two pipes in the direction of approaching and separating via the bellows, and also in the case where drainage of the internal fluid accumulates after suspension of operation, Since it accumulates at the bottom of the large-diameter cylindrical part and does not accumulate in the bellows, the accumulated drain can be easily drained from the drain pipe, preventing the drain from accumulating and freezing. It is possible to obtain an excellent effect that it can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a pipe expansion joint device of the present invention.

FIG. 2 is a sectional view schematically showing another embodiment of the expansion joint device for piping of the present invention.

FIG. 3 is a schematic sectional view of a conventional expansion joint device for piping.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 11 Tube 14 Tube 16 Large diameter cylindrical part 17 Bellows 18 Drain pipe

Claims (2)

[Claims] An end of one tubular body and an end of another tubular body are opposed to each other, and a tubular bellows is attached between the tubular bodies and connected to each other. In the expansion joint device for piping configured to absorb thermal expansion and contraction, a large-diameter tubular portion is attached to one end of any of the two tubular members, and another tubular member is provided inside the large-diameter tubular portion. At the insertion position, a cylindrical bellows is disposed between the large-diameter cylindrical portion and the distal end of another tubular body, and both ends of the bellows are positioned at the distal end of the large-diameter cylindrical portion. An expansion joint for piping, wherein the expansion joint is fixed to the inner side and the outer side of the tip of another cylindrical body, the two tubular bodies are connected, and a drain pipe is connected to the bottom of the large-diameter cylindrical portion. apparatus. 2. The expansion joint device for piping according to claim 1, wherein the large-diameter cylindrical portion is inclined and a drain pipe is connected at a lower position at the bottom.