JPH1068484A - Expansion joint device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint device that is able to prevent any deformation from being concentrated on one extensible bellows, making each extensible bellows uniformly deformable, and protect these extensible bellows from any possible damage. SOLUTION: This expansion joint device attaches a bracket 21, where a long hole 20 extending in the expansive direction of an exhaust gas duct 12 is installed, to a desired frame member 16, while another bracket 23 provided with a pin 22 to be slidably fitted in the long hole 20, is attached to the frame member 16 adjacent as in spacing a deforming clearance L to the frame member 16, thus constituting a deformed variable limiter 19 limiting the deformed variable of an extensible bellows 17.

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.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a boiler.
The boiler 1 includes a boiler main body 4 suspended and supported from a boiler steel frame 2 by a suspending member 3.
Is a panel-shaped furnace wall 5 in which many heat transfer tubes are connected by fins.
And inside the boiler body 4,
A furnace 7 having a burner 6 and a rear heat transfer section 10 provided behind the furnace 7 and provided with a economizer 8 and a superheater 9 therein are formed.

[0003] An exhaust gas duct 12 provided with a heat exchanger 11 in the middle thereof is connected to a lower portion of the rear heat transfer portion 10. The exhaust heat duct 10 and the heat exchanger 11 in the exhaust gas duct 12 are connected to each other. The intermediate position is supported by the fixing portion 14 and the like via the bracket 13.

An expansion joint 15 is provided between the rear heat transfer section 10 and the fixed section 14 and at a required position in the exhaust gas duct 12 between the fixed section 14 and the heat exchanger 11.

As shown in FIGS. 5 and 6, the expansion joint 15 has a plurality of (four in the example shown) frame members 16 formed by connecting channels having a U-shaped cross section. A configuration in which the elastic bellows 17 made of a flexible material are attached between the frame members 16 by welding or the like so as to cover the deformation gap L, while being juxtaposed to form the gap L. The frame members 16 located at both ends of the juxtaposed frame members 16 in the expansion joint 15 are attached to the flange portions 12a formed at the ends of the exhaust gas duct 12 by bolts 18. It is.

[0006] In the boiler 1 shown in FIG. 4, the combustion exhaust gas a generated by the combustion of the boiler body 4 in the furnace 7 is discharged from the exhaust gas duct 12 through the rear heat transfer section 10, To the heat exchanger 11 where heat exchange with combustion air or the like is performed.

The heat of the combustion exhaust gas a is transferred from the heat transfer tube constituting the furnace wall 5 of the boiler body 4 to water or steam flowing inside the heat transfer tube to heat the water or steam. Expands due to the heat of the combustion exhaust gas a and the exhaust gas duct 12 also expands.

The movement of the exhaust gas duct 12 in the axial direction due to the expansion of the boiler body 4 and the expansion and contraction of the exhaust gas duct 12 itself are caused by the deformation of the expansion and contraction bellows 17 of the expansion joints 15 provided on the exhaust gas duct 12. The gas is absorbed by the gap L and prevents stress from acting between the fixing unit 14 of the exhaust gas duct 12 and a fixing device such as the heat exchanger 11 and the exhaust gas duct 12.

[0009]

SUMMARY OF THE INVENTION An expansion joint 1 as described above
In FIG. 5, it is ideal that the expansion and contraction of the exhaust gas duct 12 is absorbed by uniformly deforming the expansion and contraction bellows 17. In such a case, the deformation is concentrated on one of the elastic bellows 17, and there is a possibility that the elastic bellows 17 may be damaged.

The present invention has been made in view of the above circumstances, and it is possible to prevent the deformation from being concentrated on one telescopic bellows, to uniformly deform each telescopic bellows, and to protect the telescopic bellows from damage. It is intended to provide a device.

[0011]

According to the present invention, a plurality of frame members are juxtaposed so that a deformation gap is formed between them, and a flexible material is formed between the frame members. An expansion joint device in which an expansion joint formed by attaching the formed expansion bellows so as to cover the deformation gap is interposed between ducts, wherein the deformation amount restricts the deformation amount of the expansion bellow between each frame member. The present invention relates to an expansion joint device provided with a restriction device.

In the above expansion joint device, a bracket provided with a long hole extending in the direction of expansion and contraction of the duct is attached to a desired frame member, and a frame member adjacent to the frame member with a gap for deformation is provided. By attaching a bracket provided with a pin protruding from the elongated hole so as to be slidably fitted thereto, a deformation limiting device can be configured.

According to the above means, the following effects can be obtained.

When the duct expands and contracts in the axial direction, each expansion bellows of the expansion joint is deformed. At this time, even if there is a difference in flexibility between the expansion bellows due to a manufacturing error and the like, one expansion bellows may be formed. The amount of deformation of the telescopic bellows is limited by the deformation amount limiting device, so that the deformation does not concentrate on one telescopic bellows, and each telescopic bellows deforms almost evenly. Bellows will not be damaged.

In the above expansion joint device, a bracket provided with a long hole extending in the direction of expansion and contraction of the duct is attached to a desired frame member, and a frame member adjacent to the frame member with a gap for deformation is provided. When a deformation limiter is configured by mounting a bracket having pins protruding slidably fitted into the elongated holes, the amount of deformation of one telescopic bellows is determined by the pin of the bracket with respect to the end of the elongated hole of the bracket. Is limited by the contact.

[0016]

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

FIGS. 1 to 3 show an embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 4 to 6 represent the same components. This is the same as the conventional one shown in FIGS. 4 to 6, but the feature of this illustrated example is that, as shown in FIGS.
Deformation limiter 1 that limits the amount of deformation of telescopic bellows 17
9 is provided.

The deformation limiting device 19 is provided with a bracket 21 having an elongated hole 20 extending in the direction of expansion and contraction of the exhaust gas duct 12 and a desired frame member 16 (first and third frame members 16 from the left in FIG. 1). ), And a frame member 16 adjacent to the frame member 16 with a deformation gap L therebetween.
(The second and fourth frame members 16 from the left in FIG. 1)
A pin 2 slidably fitted in the elongated hole 20.
2 has a structure in which a bracket 23 projecting therefrom is attached.

Next, the operation of the illustrated example will be described.

When the exhaust gas duct 12 expands and contracts in the axial direction, each expansion bellows 17 of the expansion joint 15 deforms.
At this time, even if there is a difference in the ease of bending due to a manufacturing error or the like of each telescopic bellows 17, the amount of deformation of one telescopic bellows 17 is limited by the long hole 20 of the bracket 21 constituting the deformation amount limiting device 19. Is limited by the contact of the pin 22 of the bracket 23 with the end of
Deformation does not concentrate on one telescopic bellows 17, and each telescopic bellows 17 deforms substantially evenly, so that the telescopic bellows 17 is not damaged.

In this way, it is possible to prevent the deformation from being concentrated on one of the elastic bellows 17, to allow each elastic bellows 17 to be uniformly deformed, and to protect the elastic bellows 17 from damage.

The expansion joint device according to the present invention is not limited to the above-described example, but may be applied to ducts other than the exhaust gas duct 12 between the rear heat transfer section 10 and the heat exchanger 11 of the boiler 1. It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0023]

As described above, according to the expansion joint device of the present invention, it is possible to prevent the deformation from being concentrated on one expansion bellows, and to uniformly deform each expansion bellows. Can be excellently protected from damage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a schematic diagram illustrating an example of a general boiler.

FIG. 5 is an enlarged sectional view of a portion V in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 12 Exhaust gas duct (duct) 15 Expansion joint 16 Frame member 17 Expansion bellows 19 Deformation limiter 20 Slot 21 Bracket 22 Pin 23 Bracket L Deformation gap

Claims (2)

[Claims] A plurality of frame members are juxtaposed so that a deformation gap is formed between the frame members, and a telescopic bellows formed of a flexible material is interposed between the frame members. An expansion joint device attached to cover a gap for use, an expansion joint device interposed between ducts, and a deformation limiting device for limiting the deformation amount of the expansion bellows is provided between each frame member. Characteristic expansion joint device. 2. A bracket provided with a long hole extending in the direction of expansion and contraction of a duct is attached to a desired frame member, and a frame member adjacent to the frame member with a gap for deformation is provided on the desired frame member. 2. The expansion joint device according to claim 1, wherein a bracket having a projecting pin slidably fitted thereto is mounted to constitute a deformation limiting device.