JPS5863686A - Hanger for pipe body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for suspending a tube body, and more particularly to a device suitable for suspending a heating tube used in a heating furnace for a chemical plant.

In FIGS. 1 and 2, a chemical plant heating furnace heat tube 2 is supported by a hanging device via a header 1. In FIG. FIG. 1 shows details of the hanging device, which is supported by a balance type. In the figure, lO is a support attached to the beam 11, and 6 is a balance beam rotatably attached to the support lO. A header 1 is suspended from one end of the balance beam 6 via a rod 12, and a counterweight 7 is suspended from the other end.
is the installation. As a result, displacement of the header 1 is absorbed by raising and lowering the counterweight 7. A plurality of suspension devices (four in the illustrated case) having the above configuration are arranged for one header to absorb displacement of the entire header.

On the other hand, in a heating furnace, at the start of operation when the temperature inside the furnace rises,
The temperature inside the furnace changes most drastically during the operation stop and when the temperature inside the furnace decreases.
The thermal stress is also large and the displacement due to thermal stress is also maximum. For example, at the start of operation, both the header 1 and the heating tube 2 are subjected to large thermal stress and are displaced, and these displacements are known. In this case, since the outlet end la of the header 1 is fixed to the wall surface of the apparatus, a moment is generated around the header la, causing it to be displaced diagonally downward as shown in FIG. Since each suspension device directly absorbs the amount of displacement of each part of the ladder 1, each suspension device operates without any resistance to the displacement of the header 1, and the header 1 is tilted as shown by 1'. Since the header 1 is tilted in this manner, a drainage pool occurs in the header, and the flow of the heating medium such as steam becomes unstable.

Also, even if the header l is displaced to the 1゛ position as shown in Figure 3,
Since the heating tube 2 does not move to the position 2' but tries to be positioned in the direction of gravity due to its own weight, an excessive bending stress is generated at the joint 13 between the ladder l and the heating tube 2. For this reason, cracks may occur in the pipe body around this joint 13, and there is a possibility that a major accident may occur due to leakage of the heated fluid.

An object of the present invention is to eliminate the above-mentioned problems and provide a suspension device that does not generate excessive stress when a tube body such as a header or a heating tube is displaced.

In short, this invention suspends a tube body such as a header via a spring hanger in the above-mentioned balance-type suspension device, and reduces the amount of descent of the tube body hanging end of the balance beam to a value smaller than the degree of the tube body. Thereafter, the displacement of the tube body is absorbed by the expansion and contraction of the spring hanger, and the displacement of the tube body is performed horizontally by the restoring force of the spring hanger.

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

In FIG. 4, a spring hanger 5 is attached via a rod 14 to the tube hanging side end 6a of the balance beam 6, which is rotatably attached to a support 10 provided on a beam 11. , this spring hanger 5 suspends the header l by means of a hanging fitting 15. The illustrated balance beam 6 has the heating device in its rated operation and the header l
This shows the position after returning to position i. The distance traveled when the L-shielding header l is displaced from the predetermined position to the lowest position 1' is shown. - indicates the length of the hanging end 6 of the tube from when the balance beam 6 is in a predetermined position until the end of the counterweight 7 hits the stopper 8 and cannot be rotated.
The distance traveled by 1 is shown. In this device, L of the moving distance is set to be larger than L2. In other words, when the header l descends and is displaced, this displacement is absorbed by the rotation of the balance beam 6 until the descending distance of the header l reaches L2, and the subsequent moving distance "l-L2" is absorbed by the extension of the spring hanger 5. do.

Here, as a property of the spring, since the displacement of the spring and the reaction force against this displacement are approximately proportional in the direction of displacement, the header 1
In each part of the hanging device, the reaction force of the spring hanger 5 acts strongly on the part where the descending distance is going to be long, and on the other hand, the reaction force of the spring hanger is weak in the part where the descending distance is relatively short, and the header l This roughly corresponds to the movement of As a result, the reaction force of the spring hanger 5 becomes stronger at the tip of the header l where the moment is large, and the header as a whole descends while maintaining its horizontal state. Further, when the device enters rated operation and the header 1 rises, it similarly rises while maintaining the horizontal state.

By carrying out this invention, the tube such as a header can be displaced while being held horizontally, so no bending moment is generated in the tube, and there is no risk of damage to the tube.

The invention is also economical because it can be implemented by modifying a conventional hanging device.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional tube suspension device, Figure 2 is an overall view of the heating device showing how the tube is suspended by the device shown in Figure 1, and Figure 3 is a view of the header and heating tubes. A partial view showing details, FIG. 4 is a side view of the hanging device according to the present invention,
FIG. 5 is an overall view of the heating device showing a state in which the tube body is suspended by the device shown in FIG. 4. 1...Header 5...Spring hanger 6...? Lance beam 7...Counterweight L construction...Movement distance of the header L2...Movement distance of the hanging end of the pipe tube 1
Figure 3

Claims (1)

[Claims] 1. In a balance-type suspension device in which a tube is suspended at one end of a balance beam and a counterweight is attached to the other end, a spring hanger is placed at the end of the balance beam on the side where the tube is suspended, and this spring hanger is By suspending the tube through the tube and making the movement distance of the tube suspension side end of the balance beam smaller than the movement distance due to tube displacement, the tube can be displaced while being held horizontally at all times. Pipe suspension device.