JP2808270B2 - Expansion joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an expansion joint having an inner cylinder inside a bellows, and more particularly to a structure of an inner cylinder.

[0002]

2. Description of the Related Art Pipes connecting fluid handling devices include:
Expansion joints are provided to mitigate thermal deformation or vibration of equipment and pipelines. In order to prevent the flow state from being disturbed by the bellows and to increase the flow resistance inside the expansion joint, if the fluid flowing through the pipeline contains fine particles, erosion due to the fine particles on the inner surface of the bellows is reduced. In order to prevent this, and in the case of a large-diameter expansion joint in which a person can perform maintenance work inside, an inner cylinder is provided for each purpose in order to protect the inner surface of the bellows.

[0003] In the case of a large-diameter expansion joint provided in a flue of a thermal power plant, and in the case of an expansion joint provided in a flue of a boiler burning coal, erosion of the inner surface of the bellows by fine particles such as fly ash. An inner cylinder is provided in order to prevent the above. However, some of the fine particles contained in the smoke exhaust leak from the gaps in the inner cylinder and the gaps for deformation, and accumulate on the bellows in a long time. The large amount of sediment in the bellow inhibits the deformation of the bellow, and the function of the expansion joint is lost. Therefore, in the case of expansion joints for such applications,
The inner cylinder has a structure that can be maintained to remove deposits in the bellows.

[0004] Fig. 5 shows a rectangular large-diameter expansion joint having a circular inner section with a circular corner, which is conventionally used in a flue of a thermal power plant. In FIG. 5, what is indicated by reference numeral 20 is an expansion joint. The expansion joint 20 is a bellows 21, a straight pipe 22 connected to both ends of the bellows 21 by welding or the like, and an outer end of each straight pipe 22. It is constituted by a flange 23 provided in the section. An inner cylinder is provided in the inner hole of the expansion joint 20 so as to bridge between the straight pipes 22 on both sides so as to cover the inner surface of the bellows 21 from the middle part of the bottom and both sides of the rectangular cross section to the lower part. . The inner cylinder includes a flat inner cylinder member 24 divided into a plurality of rectangular members in the circumferential direction of the inner hole and an arc-shaped inner cylinder member 25 corresponding to a circular corner.
It is arranged so as to be spread along the inner hole.

On the upstream side of the expansion joint 20, that is, on the near side in FIG. 5, each of the flat inner cylindrical member 24 and the arcuate inner cylindrical member 25 has an upstream side portion connected to the straight pipe 22 by a bolt 26. Fixed. Covering portions 24a, 25a are provided on mutually adjacent sides of the flat inner cylindrical member 24 and the arcuate inner cylindrical member 25, and one of them covers the other. In the case of large-diameter expansion joints used in the flue of thermal power plants, etc., regardless of whether the cross-section of the inner hole is rectangular or circular, it is not possible to manufacture and maintain the inner cylinder integrally. It is difficult, and is usually constituted by a plurality of inner cylinder members divided in the circumferential direction of the inner hole.

The expansion joint 20 configured as described above and provided in a flue or the like absorbs thermal deformation or vibration of the equipment and the pipeline during the operation of the equipment by the deformation of the bellows 21. The inner surface of the bellows 21 is
In addition, erosion due to fine particles contained in the smoke exhaust is prevented by being covered by the arcuate inner cylindrical member 25. When the maintenance work of the pipeline is performed, the inner surface of the bellows 21 is protected.
The flat inner cylindrical member 24 and the arc-shaped inner cylindrical member 25 are deformed of the bellows 21, that is, the flat inner cylindrical member 25 and the upstream flange 23 and the straight pipe 22 are fixed to the straight pipe 22 by bolts 26. The relative movement of the downstream straight pipe 22 and the flange 23 is substantially free. Further, the fine particles enter the inner surface of the bellows 21 from the gap between the adjacent sides by the covering portions 24a and 25a provided between the adjacent sides of the flat inner cylindrical member 24 and the arc-shaped inner cylindrical member 25. Is preventing that.

However, the inner surface of the bellows 21 is covered with the plurality of inner cylinder members 24, 25, and the cover portions 24a,
5a, the inner cylindrical members 24, 25
During this time, fine particles leak from small gaps between the inner tubular members 24 and 25 and the straight pipe 22 and gaps for deformation. When the inner cylinder is not provided above the inner hole as shown in FIG. 5, the inner cylinder leaks from the end side of the inner cylinder. The leaked fine particles accumulate in the space between the outer surface of the inner cylinder and the inner surface of the bellows 21 with the passage of time.

When a large amount of fine particles accumulate, the expansion joint 2
In order to maintain the zero function, the accumulated fine particles are periodically removed, for example, when the equipment is stopped for periodic inspection. At the time of this removing operation, first, the bolts 26 fixing the respective flat inner cylindrical members 24 and arcuate inner cylindrical members 25 to the straight pipe 22 are loosened and disassembled, and the flat inner cylindrical members 24 and arcuate inner cylindrical members 25 are disassembled. And the bellows 21 on which fine particles are deposited
Open and expose the inner surface of Next, the deposit is removed from the inner surface of the bellows 21. Next, each of the plate-shaped inner cylinder members 24 and the arc-shaped inner cylinder members 25 are returned to predetermined positions and closed, fastened and fixed with bolts 26, and the removing operation is completed.

[0009]

The conventional expansion joint is configured as described above, and therefore has the following problems. That is, the inside of the expansion joint 20 provided in the middle of the flue or the like is a closed space that hardly allows natural light to enter and exit from the manhole provided in the pipeline, and its working environment corresponds to a so-called 3K workplace. At the time of removing the deposits on the inner surface of the bellows 21, it is necessary to loosen and tighten a number of bolts 26 fixing the flat inner cylindrical members 24 and the arcuate inner cylindrical members 25, and the brightness is insufficient. It takes a long time to loosen screws, align screw holes, and tighten screws in this state, which is a very troublesome operation. In addition, in a case where the brightness is insufficient, a part of the bolt 26 that has been loosened and removed may be lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in an expansion joint having an inner cylinder, when removing deposits from the inner surface of the bellows, the inner surface of the bellows can be easily and quickly removed. It is an object to provide an expansion joint configured to open and close.

[0011]

In order to achieve the above object, an expansion joint according to the present invention is configured as follows. That is, in the expansion joint having the inner cylinder, the inner cylinder is divided into a plurality of inner cylinder members in the circumferential direction of the inner hole, and one side thereof is rotatably supported so that each inner cylinder member is raised. . Further, a handle is provided on a side of the inner cylinder member other than the side supported by rotation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an expansion joint according to the present invention will be described below in detail with reference to the drawings.
Note that the same reference numerals are used for members that are the same as or equivalent to those in the description of the related art. FIG. 1 is a perspective view showing an expansion joint according to the present invention, and FIG.
FIG. 3 is an enlarged perspective view taken along a line III in FIG. 2, and FIG. 4 is an enlarged perspective view taken along a line IV in FIG. I.

In FIG. 1 to FIG. 4, what is indicated by reference numeral 10 is a rectangular large-diameter expansion joint having a circular cross-section with an inner hole section. The expansion joint 10 includes a bellows 21, straight pipes 22 connected to both ends of the bellows 21 by welding or the like, and flanges 23 provided at outer ends of the straight pipes 22. In the inner hole of the expansion joint 10, a bellows 2 is provided from the middle part of the bottom and both sides of the rectangular cross section to the lower part.
An inner cylinder is provided so as to bridge between the straight pipes 22 on both sides so as to cover the inner surface of the inner tube 1. The inner cylinder is formed by arranging a flat inner cylinder member 24 divided into a plurality of rectangular shapes in the circumferential direction of the inner hole and an arc-shaped inner cylinder member 25 corresponding to a circular corner so as to be spread along the inner hole. It is configured. Covering portions 24a, 25a are provided on mutually adjacent sides of the flat inner cylindrical member 24 and the arcuate inner cylindrical member 25, and one of them covers the other. By the covering portions 24a and 25a,
The gap between the mutually adjacent sides of the flat inner cylindrical member 24 and the arc-shaped inner cylindrical member 25 is closed.

Each of the flat inner cylindrical members 24 is an L-shaped rod member 1 provided on the upstream side of the flat inner cylindrical member 24 on the upstream side of the expansion joint 10, ie, on the near side in FIG.
1a and a supporting member 11b having a hole in the circumferential direction provided on the inner peripheral surface of the straight pipe 22.
Is formed, and a portion bent in the circumferential direction of the inner hole on the distal end side of the rod member 11a is rotatably inserted into the hole of the support member 11b. In the case of the flat inner cylindrical member 24 provided on the side of the inner hole, the rod member 11a is
It is inserted from above into the hole of b. Each of the arc-shaped inner cylinder members 25 has an L-shaped rod member 11a provided on a flow direction side of the arc-shaped inner cylinder member 25 at a portion adjacent to the flat inner cylinder member 24 on the bottom side of the inner hole. Flat inner cylindrical member 24
And a support member 11b having a hole in the flow direction provided on the side of the flow direction, and a portion bent in the flow direction in which the tip of the rod member 11a is on the downstream side. Is rotatably inserted into the hole of the support member 11b from the upstream side.

Each of the flat inner cylindrical members 24 is provided with a substantially U-shaped handle 12 on the downstream side of the expansion joint 10, that is, on the downstream side of the inner side in FIG. Each of the arcuate inner cylindrical members 25 is provided with a substantially U-shaped handle 12 on the side in the flow direction opposite to the side on which the support portion 11 is formed. In addition, on the upper side of the upstream side of the plate-shaped inner cylindrical member 24 provided on the side of the inner hole, the plate is rotatably supported by the support bolt 13b on the inner peripheral surface of the straight pipe 22. A fixing portion 13 is formed, which includes a fixing lever 13a and a wedge-shaped fixing member 13c provided on the flat inner cylindrical member 24. The tip of the fixing lever 13a is the fixing member 1
The flat inner cylindrical member 24 is pressed against the inner peripheral surface of the straight pipe 22 and fixed while riding on the wedge-shaped slope 3c.

In the expansion joint 10 configured as described above, when the flanges 23 at both ends are connected to a flue or the like in the state shown in FIG. , Front side, ie, upstream side flange 2
3 and the straight pipe 22 and the members downstream of the bellows 21 are relatively deformed in the flow direction and the direction perpendicular thereto. However, the flat inner cylindrical member 24 has an upstream side portion entirely formed by the rotation supporting portion 11 and the fixing portion 13 by the upstream straight pipe 2.
2 and are supported and fixed only. Also, the arcuate inner cylindrical member 2
5 is a plate-like inner cylindrical member 24 provided by the rotation support portion 11 in a portion adjacent to the plate-like inner cylindrical member 24 on the bottom side of the inner hole.
It is supported by. Therefore, the expansion joint 10 can be deformed without being restricted by the inner cylinder, that is, the flat inner cylinder member 24 and the arc-shaped inner cylinder member 25.

When the equipment is stopped and the inner surface of the bellows 21 is opened and closed to inspect and clean the inside of the pipeline, the following operation is performed. When the inner surface of the bellows 21 is opened, first, the fixing lever 13a of the fixing portion 13 is turned to remove the tip from the fixing member 13c, and the fixing state is released. Next, the flat inner cylindrical member 24 on the side of the inner hole from which the fixed state is released is held by the handle 12 and the rotation support portion 11 is raised as a rotation fulcrum. Since the rod member 11a is inserted into the hole of the support member 11b from above, the flat inner cylindrical member 24 does not drop. If necessary, the plate-like inner cylinder member 24 is lifted, and the bar member 11a is pulled out from the support member 11b of the rotation support portion 11, whereby the plate-like inner cylinder member 24 is separated from the inner hole and stored elsewhere. Similarly,
The arc-shaped inner cylindrical member 25 and the flat inner cylindrical member 24 at the bottom of the inner hole are sequentially raised from the side to the center, separated as necessary, and stored elsewhere. As a result, the inner surface of the bellows 21 is opened.

When the inner surface of the bellows 21 is closed after the inspection and cleaning, the operation is performed in a reverse procedure to the case where the inner surface of the bellows 21 is opened. That is, first, after inserting the bar member 11a into the support member 11b, the flat inner cylindrical member 24 located at the center of the bottom of the inner hole is inserted.
Pull back the rotation support portion 11 as a rotation fulcrum,
Cover the inner surface. Thereafter, the flat inner cylindrical member 24, the arc-shaped inner cylindrical member 25, and the flat inner cylindrical member 24 on the side of the inner hole are pulled back to the opposite sides along the circumferential direction of the inner hole with the respective rotation support portions 11 as the rotation fulcrum. , Covers the inner surface of the bellows 21. Next, the flat inner cylindrical member 24 on the side of the inner hole is brought into a fixed state by turning the fixing lever 13 a of the fixing portion 13. As a result, the inner surface of the bellows 21 is closed. Each of the plate-shaped inner cylinder members 24 and the arc-shaped inner cylinder members 25 are provided at the center of the bottom of the inner hole.
Except for the above, cover portions 24a and 25a are provided on the inner side portions, and the cover portions 24a and 25a sequentially become The inner cylinder member 24 and the arcuate inner cylinder member 25 are restrained, and the entire inner cylinder is fixed.

In the above description based on FIGS.
As the expansion joint 10, the large-diameter expansion joint 10 having a rectangular cross section with a circular corner portion in the inner hole is shown.
The same applies to expansion joints having a circular or small diameter inner hole cross section. Also, when the inner cylinder is provided over the entire circumference of the inner hole, the inner cylinder member on the upper side is fixed to the fixing portion 13.
The same applies by fixing as appropriate, and the number of divisions of the inner cylinder is appropriately selected.
The rotation support portion 11 is formed at two places on one side of each of the inner cylindrical members 24 and 25, but may be formed at one place or three or more places. Although the handle 12 is provided on the side of the inner cylinder members 24 and 25 opposite to the side on which the rotation support portion 11 is formed, the handle 12 may be provided at other locations. The position where the fixing portion 13 is formed may be on the upstream side of the flat inner cylindrical member 24, and is not limited to the flat inner cylindrical member 24 provided on the side of the inner hole. May be formed on any of the inner cylinder members 24, 25, and the number of formed portions may be two or more per one inner cylinder member 24, 25. Rotation support part 1
1. The configurations and shapes of the handle 12 and the fixing portion 13 are not limited to the above description, but include other configurations and shapes included in the technical scope of the description.

[0020]

The expansion joint according to the present invention is configured as described above, so that the following effects can be obtained. That is, in the expansion joint having the inner cylinder, the inner cylinder is divided into a plurality of inner cylinder members in the circumferential direction of the inner hole,
As each inner cylinder member is raised, one side thereof is rotatably supported, so that each inner cylinder member is opened and closed by one simple operation of causing the rotation support portion as a rotation fulcrum, and pulling back, The inner surface of the bellows can be easily opened and closed in a short time. Such an opening and closing operation of the inner cylinder member does not include a detailed operation, and is easily and reliably performed even when the brightness is insufficient. Also, in such an opening and closing operation, fine parts are not disassembled and separated,
No parts are lost.

Further, the handle is provided on the side of the inner cylinder member other than the side supported by rotation, so that the inner cylinder member is
When being raised and pulled back using the rotation support portion as a rotation fulcrum, the opening / closing operation can be performed more easily using the handle.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an expansion joint according to the present invention.

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

FIG. 3 is an enlarged perspective view taken along a line III in FIG. 2;

FIG. 4 is an enlarged perspective view of a section IV in FIG. 1;

FIG. 5 is a perspective view showing a conventional expansion joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Expansion joint 11 Rotation support part 12 Handle 13 Fixed part 20 Conventional expansion joint 21 Bellows 22 Straight pipe 23 Flange 24 Flat inner cylinder member 25 Arc-shaped inner cylinder member 26 Bolt

Claims (2)

(57) [Claims] 1. An expansion joint (10) having an inner cylinder, wherein the inner cylinder has a plurality of inner cylinder members (24, 2
5) and each of the inner cylinder members (24, 2
An expansion joint characterized in that one side thereof is rotatably supported so that 5) is caused. 2. An expansion joint according to claim 1, wherein a handle is provided on a side of the inner cylinder member other than the side supported by rotation.