JPS5936157B2 - multiple bend pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-bend pipe in which a fixing plate is installed to hold the inner pipe of the multi-bend pipe so as not to deform.

In general, the inner tube 2 of the multiple bend tube shown in FIG. It tends to deform outward in response to the contraction reaction force of 12.

For this reason, the seal plate 11 supports both ends of the inner pipe 2 of the multi-bend pipe and seals both ends of the pressure pipe 1.
will be damaged and the sealing effect will be lost. The purpose of the present invention is to
In order to prevent the inner tube of the multiple bend tube from deforming outward due to the reaction force of the bellows that connects the ends of the inner tubes of the multiple bend tube, the inner tube of the multiple bend tube is firmly held against the force tube. The purpose of the present invention is to obtain a multi-bend pipe having a structure that allows the pipe to be bent.

The details of the present invention will be explained below along with examples shown in the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a multi-bend pipe according to the present invention (a case where a fixing plate is attached to approximately the center of the bend pipe).

In the figure, 1 indicates a pressure tube which is an outer tube. This pressure pipe 1
The inner tube 2 is inserted concentrically with the inner tube 2. Both ends of the inner tube 2 are supported by alumina spacers 3, as shown in FIGS. 2 and 3. Alumina spacer 3 is
As shown in Fig. 2, an annular plate 4 welded and fixed to the pressure pipe 1.
and an alumina molded plate 5 attached to the center of this annular plate 4. The alumina molded plate 5 ′ is in contact with the outer peripheral surface of the inner tube 2 . Further, the welded portions 3a between the annular plate 4 and the pressure pipe 1 are arranged at equal angular intervals on the circumferential surface of the annular plate 4, as shown in FIG. In the non-welded portion, an arc-shaped notch 6 is bored so that a small space is formed between the pressure pipe 1 and the pressure pipe 1. The fixing plate T is a boundary ( The fixing plate 7 is provided at an intermediate position that divides the arc length of the curved pipe into two.
As shown in FIG. 4, the periphery of the annular disk is notched to form a substantially triangular (but not limited to triangular) shape. An arc-shaped mounting plate 8 having the same curvature as the inner surface of the pressure pipe 1 is welded and fixed to each vertex of the pressure pipe 1. This mounting plate 8 is welded and fixed to the pressure pipe 1 by means such as plug welding. Further, the inside of this fixing plate 7 is welded and fixed to the outer circumferential surface of the inner tube 2. To install the alumina spacer 3 and fixing plate 7, first fix the fixing plate 7 to the inner pipe 2 by welding, then fill in the heat insulating material 9, then fix the alumina spacer 3 to the pressure pipe 1 by welding, The outside thereof is filled with a heat insulating material 10.

Furthermore, the outside of this heat insulating material 10 is sealed with a seal plate 11. Next, the operation of this embodiment configured as described above will be explained.

Thermal expansion of the inner tube 2 of the multiple bend tube is caused by the thermal expansion of the inner tube 2'' in the multiple tube shown in FIG. 5 connected to both ends of the multiple bend tube.
It is absorbed by the contraction action of a bellows 12 (not shown) that connects the ends of each other.

This contraction reaction force (spring force) of the bellows 12 acts on the inner tube 2. For example, assuming that there is no fixed plate 7, the contraction reaction force of the bellows 12 is the R of the inner tube 2 of the multi-bend tube.
It is concentrated at the center of the circular arc between the stops and is balanced with the bending reaction force of the inner tube 2 that is generated by bending this part more. For this reason, by providing the fixing plate 7 in the center that bisects the arc between the R end of the inner tube 2 and restraining the deformation of the bellows 12 against the contraction reaction force, the fixing plate 7
The amount of thermal expansion of the inner tube 2 is divided into two parts, each of which expands thermally in a direction that causes the bellows 12 to contract.
By doing this, the contraction reaction force of the bellows 12 is balanced with the restraining force of the inner tube 2 by the fixing plate 7. Due to the balance between the contraction reaction force of the bellows 12 and the restraining force of the fixing plate 7, the bent portion of the inner tube 2 is not deformed, and the alumina spacer 3 and seal plate 11 are able to maintain the connection between the inner tube 2 and the pressure tube 1. The relative positional relationship between the pipes is maintained in its original state, and the function as a multi-bend pipe is maintained.

As detailed above, according to the multi-bend pipe of the present invention, a fixing plate is provided at the center of the circular arc between the R-ends of the inner pipe, and the thermal expansion of the inner pipe is divided into two with this fixing plate as a boundary, thereby forming the multi-bend pipe. The ends of the inner tubes in the multiple tubes connected to the tube are extended toward the connecting bellows side, and the contraction reaction force of the bellows and the restraining force of the fixed plate are balanced, so that the curved section of the inner tube There is no deformation, there is no relative misalignment between the alumina spacer and seal plate, and the inner tube and pressure tube, and no damage to the alumina spacer and seal plate occurs.

Therefore, it is possible to obtain a multi-bent pipe that maintains its function as a multi-bent pipe and is highly safe against thermal expansion, and its use has great effects.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of one embodiment of the multi-bend pipe of the present invention, FIG. 2 is an enlarged sectional view of section C in FIG. 1, FIG. The figure is a sectional view taken along the line B--B in FIG. 1, and FIG. 5 is a vertical sectional view showing a conventional multi-bent pipe and the multi-bend pipe connected to the end of the multi-bent pipe. 1...Pressure pipe, 2,2''...Inner pipe, 3
...Alumina spacer, 4 ... Annular plate, 5 ... Alumina molded plate, 6 ... Notch, 7 ... Fixing plate, 8...Mounting plate, 9
, 10...Insulating material, 11...Seal plate, 12...Bellows.

Claims (1)

[Claims] 1. In a multi-bent pipe connected to a high-temperature, high-pressure fluid flow pipe equipped with a bellows, the inner pipe and the pressure pipe are made concentric through a spacer, and the center position bisects the circular arc between the R end of the inner pipe. A multi-bend pipe characterized in that a fixed plate is welded and fixed to the outer periphery of the inner pipe and the inner periphery of the pressure pipe.