JPH033116B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for absorbing the relative thermal expansion difference of piping connecting devices.

[Prior Art] When a plurality of devices are connected through piping and a high-temperature fluid is flowed from one device to another through the piping, the piping expands thermally. When the piping expands thermally, stress is concentrated on the piping itself and on the connections between the piping and the equipment, so when the piping thermally expands, it is necessary to absorb this stress.

Conventionally, as a method of absorbing thermal expansion of such piping, as shown in FIG. As shown in FIG. 4, there is a method of interposing bellows c in the middle of each of pipes a and b, and as shown in FIG. 5, a method of sliding equipment B sideways.

[Problems to be Solved by the Invention] However, the above method attempts to absorb the thermal expansion of the pipes a and b by the flexibility of the pipes a and b themselves. It has drawbacks such as being long and expensive, and requiring a large room space.

Furthermore, since the above method uses the bellows c, it is expensive and has reliability problems.

Furthermore, in the above method, the thermal expansion of piping a is used to slide equipment B to absorb the thermal expansion of piping a, but when equipment B slides, the equipment B and other equipment or fixed point C Since it is necessary to absorb the expansion and contraction of the piping b connecting the two, the piping b must have flexibility. If the pipe b is lengthened in order to provide flexibility, it becomes expensive and creates space problems, as in the case of the above method.

Therefore, the present invention aims to provide a method for absorbing thermal expansion of piping, which can eliminate the drawbacks of the conventional methods described above.

[Means for solving the problem] The present invention connects the lower end of a first device and the lower end of an intermediate second device with a first pipe, and connects the intermediate second device to the first pipe. The second device is supported so that it can rotate with horizontal extension, and the rotational support position of the second device is set so that the amount of piping extension at the lower end of the first device is equal to the amount of piping extension at the lower end of the second device. , furthermore, connect the upper end of the second device to another device or a fixed point with a second pipe, and set the horizontal length of the second pipe to the second device when the second device rotates. The length should be such that the same angle as the angle of the lower end piping can be obtained on the upper end side, and the amount of elongation in the height direction on the second equipment side of the second piping and on the other equipment or fixed point side is the same. The attachment point position of the second pipe to the other device is determined.

[Operation] When the first pipe expands thermally, the second device rotates around its rotational support due to the horizontal extension of the pipe, thereby absorbing thermal stress. 2nd above
The second pipe is displaced in the horizontal direction by the rotation of the equipment.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

As an example, FIG. 1 shows a case where a first device A and a second device B are connected by a first pipe 1, and a second device B and a fixed point C are connected by a second pipe 2. There is.

The first pipe 1 has a horizontal part 1a and vertical parts 1b and 1c.
The amount of elongation of the vertical portion 1b of the pipe 1 at the lower end of the first device A is δ ₀ , while the amount of elongation of the vertical portion 1c of the pipe 1 at the lower end of the second device B is also δ ₀ . As shown, the support position 3 of the second device B is
is set at a distance h ₀ from the horizontal portion 1a, and this support position 3 is used as a rotation support structure so that the second device B can rotate in the direction of expansion and contraction of the horizontal portion 1a of the first pipe 1.

The second pipe 2 is also bent into a horizontal part 2a and vertical parts 2b, 2c, and the amount of elongation of the vertical part 2b of the pipe on the upper end side of the second equipment B and the amount of elongation of the vertical part 2c on the side of the fixed point C are the same. The length _h1 of the vertical part 2c is determined so that the length h1 of the vertical part 2c is the same, and the length h1 of the horizontal part 2a of the second pipe 2 is determined so that the length h1 of the vertical part 2c is the same as that of the vertical part 1c when the second equipment B rotates due to the thermal expansion of the pipe 1. The rotation angle θ ₂ of the vertical portion 2b of the second pipe 2 is determined so that θ ₁ =θ ₂ with respect to _the rotation angle θ 1 .

First device A, second device B, fixed point C, first
The arrangement of the pipe 1 and the second pipe 2 is on the same line in a plane as shown in FIG.

Now, when high-temperature fluid is passed from the first device A to the second device B, the vertical portions 1b, 1c and the horizontal portion 1a of the first pipe 1 undergo thermal expansion and elongate as shown by broken lines in FIG. This elongation of the horizontal portion 1a of the pipe 1 is absorbed by the rotation of the second equipment B, since the supporting part of the second equipment B is rotatable, and the elongation of the first pipe 1 is absorbed by the rotation of the second equipment B. The resulting thermal stress can be absorbed.

On the other hand, the second pipe 2 also expands thermally and the second pipe 2 also expands thermally.
However, the length of the horizontal part 2a is determined so that the vertical parts 2b and 2c have the same elongation and the angles θ ₁ and θ ₂ are made equal. , the displacement of the second pipe 2 can be easily absorbed.

In addition, for earthquake resistance, snub bars 4 may be provided in the upper and lower parts of the second device B in the horizontal direction.
Further, although the case where the second pipe 2 is fixed at the fixed point C has been shown, the same applies to the case where the second pipe 2 is connected to another device not shown.

[Effects of the Invention] As described above, according to the present invention, the length of the piping can be shortened and thermal stress caused by thermal expansion can be absorbed, which is very advantageous in terms of cost and space. At the same time, it can provide excellent effects such as higher reliability than bellows.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a plan view, and FIGS. 3 to 5 are examples of a conventional piping thermal expansion absorption method. A indicates the first device, B indicates the second device, C indicates the fixed point, 1 indicates the first pipe, 2 indicates the second pipe, 1a and 2a indicate the horizontal section, and 1b, 1c, 2b, and 2c indicate the vertical section. .

Claims (1)

[Claims] 1. In the first piping connecting the lower end of the first equipment and the lower end of the second equipment located in the middle, the amount of elongation of the lower end of the second equipment is equal to the amount of elongation of the lower end of the first equipment. The length of the lower end of the second device is determined to determine the supporting position of the second device, the supporting portion is made rotatable, and the elongation of the horizontal portion of the first piping is absorbed by the rotation of the second device. In the second piping that connects the upper end of the second equipment and another equipment or fixed point, determine the length of the piping so that the amount of extension on the other equipment or fixed point side is equal to the amount of extension at the upper end of the second equipment. ,
A method for absorbing thermal expansion of piping, further comprising making the horizontal portion of the second piping long enough to follow the rotation of the second device.