JP2015057572A - Expansion joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint structure capable of reducing the oscillation of a free-end part by increasing the rigidity of the free edge of a flow liner.SOLUTION: An expansion joint structure 1 comprises: an expansion joint 9 for connecting an upstream-side exhaust gas pipe 5 and a downstream-side exhaust gas pipe 7, which are arranged in an axial direction at spacings, such that the spacings can be adjusted; and a substantially cylindrical flow liner 23 whose upstream-side end part is fixed to the internal surface of the upstream side exhaust gas pipe 5, the flow liner 23 extending on the downstream side so as to cover the expansion joint 9 and arranged in a radial direction with spacings. Outer ribs are provided for increasing the rigidity of the flow liner 23, the outer ribs being composed of a plurality of plates arranged on the surface of the flow liner 23 on the side of the expansion joint 9 in a circumferential direction with spacings, each plate protruding in a radial direction and mounted so as to extend in an axial direction.

Description

  The present invention relates to an expansion joint structure.

In the exhaust gas pipe through which the high-temperature and high-pressure exhaust gas from the gas turbine is circulated, the exhaust gas is naturally cooled during the movement, so that the temperature differs at the axial position. Along with this temperature change, the exhaust pipe has a different amount of expansion and contraction in the axial direction, so that thermal stress is generated. In order to reduce this thermal stress, the exhaust gas pipe is divided into a plurality of parts in the axial direction, and they are connected by an expansion joint that absorbs the expansion / contraction amount difference.
A flow liner is attached to the expansion joint portion in order to allow the exhaust gas to flow without disturbing the flow and to prevent the exhaust gas from entering the expansion joint (see Patent Document 1).
The flow liner has a substantially cylindrical shape, and an upstream end is attached to an upstream exhaust gas pipe with a bolt, and a downstream end is a free end, that is, a cantilever.

Japanese Patent Laid-Open No. 2002-235883

By the way, since the flow liner shown by patent document 1 is a cantilever, a vibration generate | occur | produces with the excitation force accompanying the fluctuation | variation of waste gas. This vibration is greatest at the downstream end, which is the free end. This vibration can cause fatigue and damage to the flow liner.
In addition, since there is a gap between the flow liner and the exhaust gas pipe at the downstream end of the flow liner, the exhaust gas and the heat accompanying it enter through this gap. For this reason, since an expansion joint part becomes a high temperature environment, in order to eliminate the bad influence of high temperature, sufficient heat insulating material is needed, and the cost of a product will be increased.

  In view of such circumstances, an object of the present invention is to provide an expansion joint structure that increases the rigidity of the free end of the flow liner and reduces the vibration of the free end.

In order to solve the above problems, the present invention employs the following means.
That is, according to one aspect of the present invention, an expansion joint that connects an upstream pipe and a downstream pipe that are spaced apart in the axial direction so that the distance can be adjusted, and an upstream end on the inner surface of the upstream pipe An expansion joint structure comprising: a fixed substantially cylindrical shape, and a flow liner that extends downstream and covers the expansion joint portion, and is disposed at an interval in a radial direction, The expansion joint structure is characterized in that a reinforcing member for increasing the rigidity of the flow liner is provided at the downstream end of the flow liner.

According to this aspect, since the reinforcing member that increases the rigidity of the flow liner is provided at the downstream end of the flow liner, the rigidity of the downstream end that is the free end of the flow liner can be increased. As described above, when the rigidity at the downstream end of the flow liner is increased, the rigidity against the excitation force accompanying the fluctuation of the fluid passing through the upstream side pipe and the downstream side pipe is increased. The generated vibration can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in a flow liner can be relieve | moderated, the possibility that a flow liner may carry out fatigue damage can be reduced.

  In the above aspect, the reinforcing member may be a horizontal rib in which an arc-shaped plate is attached to the downstream end of the flow liner so as to extend in the circumferential direction.

If it does in this way, the rigidity in the downstream end which a horizontal rib is a free end of a flow liner can be improved.
You may make it provide a horizontal rib over the perimeter of a flow liner. You may make it provide a horizontal rib partially in the circumferential direction of a flow liner. In this case, you may make it provide in multiple places.
It is preferable that the inner rib side end portion of the lateral rib is positioned on the outer peripheral side from the inner peripheral side end portion of the flow liner because resistance to fluid flowing on the inner peripheral side of the flow liner does not occur.

  In the above aspect, the flow liner is attached to one of the downstream portion of the flow liner and the downstream piping so as to extend toward the downstream portion of the other flow liner or the downstream piping, and a piece is attached to the tip portion. And a guide member that is attached to the downstream portion of the other flow liner or the downstream pipe, and that guides the piece portion so as to be movable. It is good also as a structure used as the moving member or guide member attached to the downstream part of the liner.

If it does in this way, the rigidity in the downstream end which is a free end of a flow liner can be improved in the moving member or guide member attached to the downstream part of a flow liner.
The moving member and the guide member may be provided at one place, or may be provided at a plurality of places at intervals in the circumferential direction.

  In the above configuration, the moving member may be an arc-shaped plate member that is attached to extend in the circumferential direction, and the opening of the guide member may be extended in the circumferential direction.

In this case, the moving member and the guide member that are located in the gap formed between the flow liner and the downstream pipe extend in the circumferential direction. Can be prevented from entering the expansion joint.
For this reason, when a fluid is high temperature, for example like the exhaust gas of a gas turbine, the quantity of the heat insulating material installed in an expansion joint part can be reduced.

  In the said aspect, the said reinforcement member may be comprised with the tubular member attached between the downstream part of the said flow liner, and the said downstream piping, or a semi-tubular member.

In this way, the downstream portion of the flow liner is restrained from moving by the downstream piping via the tubular member or the semi-tubular member, so that it passes through the upstream piping and the downstream piping. The rigidity against the excitation force accompanying the fluctuation of the fluid to be increased increases. In other words, the tubular member or the semi-tubular member can increase the rigidity at the downstream end which is the free end of the flow liner.
For this reason, since the tubular member or the semi-tubular member can alleviate the vibration generated at the downstream end of the flow liner, the magnitude of the stress generated in the flow liner can be reduced, and the flow liner is fatigued. The risk of doing so can be reduced.
Since the tubular member or the semi-tubular member covers the gap formed between the flow liner and the downstream pipe, the fluid and the heat accompanying it are prevented from entering the expansion joint from this gap. be able to.
For this reason, when a fluid is high temperature like the exhaust gas of a gas turbine, for example, the quantity of the heat insulating material installed in an expansion joint part can be reduced, and the lifetime of a heat insulating material can be lengthened.

  In the above aspect, a plurality of the reinforcing members are provided on the surface of the flow liner on the side of the expansion joint portion at intervals in the circumferential direction, each protruding in the radial direction, and attached so as to extend in the axial direction. It may be an outer rib made of a plate material.

  If it does in this way, the rigidity in the downstream end part which an outer rib is a free end of a flow liner can be improved.

  In the said aspect, the elastic member which covers the space formed between the said flow liner and the said downstream piping may be mounted | worn with the downstream end of the said flow liner.

If it does in this way, the elastic member can respond to the fluctuation | variation of the magnitude | size of the space accompanying the relative movement of a flow liner and downstream piping by elastically deforming. Further, since the elastic member covers a space which is a gap formed between the flow liner and the downstream pipe, it is possible to suppress the fluid and the heat accompanying it from entering the expansion joint portion from this space. .
For this reason, when a fluid is high temperature like the exhaust gas of a gas turbine, for example, the quantity of the heat insulating material installed in an expansion joint part can be reduced, and the lifetime of a heat insulating material can be lengthened.

  In the above aspect, the downstream flow liner configured to be symmetrical with respect to the downstream end surface of the flow liner is provided on the downstream side of the flow liner, and the upstream end of the downstream flow liner is connected to the downstream end of the flow liner. You may attach so that the downstream end of a flow liner may oppose.

In this way, the space in which the fluid and the heat accompanying it enter the expansion joint is limited to the gap formed between the downstream end of the flow liner and the upstream end of the downstream flow liner. It can suppress entering into an expansion joint part.
For this reason, when a fluid is high temperature like the exhaust gas of a gas turbine, for example, the quantity of the heat insulating material installed in an expansion joint part can be reduced, and the lifetime of a heat insulating material can be lengthened.

According to the present invention, since the reinforcing member that increases the rigidity of the flow liner is provided at the downstream end portion of the flow liner, vibration generated at the downstream end portion of the flow liner can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in a flow liner can be relieve | moderated, possibility that a flow liner will carry out fatigue damage can be reduced.

It is a side view showing the composition of the exhaust pipe of the gas turbine in which the expansion joint structure concerning a first embodiment of the present invention is used. It is a fragmentary sectional view which shows the A section of FIG. It is the fragmentary perspective view seen from the inner peripheral side which shows a part of flow liner of FIG. It is a fragmentary sectional view showing the flow liner part of the expansion joint structure concerning a second embodiment of the present invention. It is XX sectional drawing of FIG. It is a fragmentary sectional view showing the flow liner part of the expansion joint structure concerning a third embodiment of the present invention. It is a fragmentary sectional view which shows the B section of FIG. It is YY sectional drawing of FIG. It is a fragmentary sectional view which shows the flow liner part of the expansion joint structure concerning 4th embodiment of this invention. It is a fragmentary sectional view showing a flow liner part of an expansion joint structure concerning a fifth embodiment of the present invention. It is a fragmentary sectional view which shows the flow liner part of the expansion joint structure concerning 6th embodiment of this invention. It is the fragmentary perspective view seen from the inner peripheral side which shows a part of flow liner of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First embodiment]
Hereinafter, the expansion joint structure 1 concerning 1st embodiment of this invention is demonstrated with reference to FIGS. 1-3.
FIG. 1 is a side view showing a configuration of an exhaust pipe of a gas turbine in which the expansion joint structure according to the first embodiment of the present invention is used. 2 is a partial cross-sectional view showing a portion A of FIG. FIG. 3 is a partial perspective view showing a part of the flow liner of FIG. 2 as seen from the inner periphery side.

In the present embodiment, the present invention is described as being applied to the exhaust gas pipe 3 of a gas turbine.
The exhaust gas pipe 3 is divided in the axial direction L into an upstream exhaust gas pipe (upstream pipe) 5 and a downstream exhaust gas pipe (downstream pipe) 7.
The upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 are connected by the expansion joint structure 1 so that the interval in the axial direction L can be adjusted.

  The expansion joint structure 1 disturbs the flow of exhaust gas (fluid) in the expansion joint (expansion joint portion) 9 that connects the upstream exhaust gas pipe 5 and the downstream exhaust gas pipe 7 so that the distance can be adjusted, and the expansion joint 9. And a flow liner portion 11 for preventing exhaust gas from flowing into the expansion joint 9.

The expansion joint 9 has a hook-like upstream flange 13 attached to the outer periphery of the downstream end of the upstream exhaust pipe 5 and a hook attached to the outer periphery of the upstream end of the downstream exhaust pipe 7. A downstream flange 15 and an expansion / contraction member 17 that connects the outer peripheral side ends of the upstream flange 13 and the downstream flange 15 over the entire circumference and is capable of deformation in the axial direction L and the radial direction. ing.
The elastic member 17 is made of, for example, a material having flexibility and heat insulation properties such as heat resistant rubber.

A holding member 19 typified by a wire mesh is attached to the inside of the space formed by the upstream flange 13, the downstream flange 15, and the expansion / contraction member 17 with a space therebetween. A space formed by the upstream flange 13, the downstream flange 15, the expansion / contraction member 17 and the holding member 19 is filled with a heat insulating material 21 such as glass wool.
The heat insulating material 21 is also filled in the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7.

The flow liner portion 11 guides the flow of the exhaust gas and prevents the exhaust gas from directly entering the expansion joint 9. Further, the flow liner 23 guides the flow to the downstream side, and the circumferential direction toward the inner peripheral side of the flow liner 23. A plurality of inner ribs 25 attached to each other at intervals, and a lateral rib (reinforcing member) 27 attached to the downstream end of the flow liner 23 by welding so as to extend in the circumferential direction. .
The flow liner 23 is a plate material having an overall cylindrical shape. The flow liner 23 includes a large-diameter portion 29 having an outer diameter substantially equal to the inner diameter of the upstream-side upstream exhaust pipe 5, a small-diameter portion 31 having a diameter smaller than the large-diameter portion 29 on the downstream side, An inclined portion 33 that sequentially connects the small-diameter portion 31 and that changes in diameter is provided.

The flow liner 23 is attached to the upstream exhaust gas pipe 5 by attaching the upstream large-diameter portion 29 to the inner surface of the upstream exhaust gas pipe 5 by bolts. Therefore, the inclined portion 33 and the small diameter portion 31 are only supported by the large diameter portion 29, and the downstream end portion of the small diameter portion 31 is a free end.
The downstream end of the small diameter portion 31 is located at a position substantially the same as the downstream end position of the downstream flange 15. Therefore, the flow liner 23 is disposed so as to cover the entire expansion joint 9 in the axial direction L.

The inner rib 25 protrudes radially inward from the flow liner 23 and is attached so as to extend in the axial direction L so as to cover substantially the entire length of the flow liner 23 in the axial direction L. The inner rib 25 is fixed to the flow liner 23 by, for example, all-around welding. Spot welding may be used instead of full circumference welding.
The inner rib 25 has a function of reinforcing the overall rigidity of the flow liner 23.

  The lateral rib 27 is a plate material having a donut shape (arc shape), and the inner diameter thereof is substantially equal to the inner diameter of the small diameter portion 31 of the flow liner 23. Therefore, since the inner peripheral side end of the horizontal rib 27 does not protrude inward from the flow liner 23, there is no resistance to the exhaust gas flowing on the inner peripheral side of the flow liner 23. The inner diameter of the lateral rib 27 may be smaller than the inner diameter of the small diameter portion 31 of the flow liner 23.

  In the present embodiment, the horizontal rib 27 is provided over the entire circumference of the flow liner 23, but may be provided partially in the circumferential direction of the flow liner 23. In this case, you may make it provide in multiple places.

Hereinafter, the effect of the expansion joint structure 1 concerning this embodiment comprised in this way is demonstrated.
High-temperature and high-pressure exhaust gas from the gas turbine flows into the exhaust gas pipe 3. When the exhaust gas flows from the upstream side exhaust pipe 5 toward the downstream side exhaust pipe 7, the exhaust gas is guided and flowed to the inner peripheral surface of the flow liner 23, so that it flows smoothly and the flow is not disturbed.

Since the temperature of the exhaust gas flowing through the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 may vary depending on the location, the positions of the downstream end of the upstream side exhaust pipe 5 and the upstream end of the downstream side exhaust pipe 7 are the axial direction L and the radial direction. It fluctuates with. This variation is absorbed by the deformation of the elastic member 17.
Therefore, the thermal stress accompanying the deformation generated in the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 can be relaxed.

  Since the exhaust gas moves at a high speed along the inner surface of the flow liner 23, a large force acts on the flow liner 23. For example, the force acting on the flow liner 23 fluctuates due to fluctuations in the exhaust gas such as fluctuations in the amount of exhaust gas and turbulence, so that the exhaust gas generates vibration by applying an excitation force to the flow liner 23.

In the present embodiment, the rigidity at the downstream end portion where the lateral rib 27 is the free end of the flow liner 23 can be increased. As described above, when the rigidity at the downstream end of the flow liner 23 is increased, the rigidity against the excitation force accompanying the fluctuation of the exhaust gas passing through the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 is increased. The vibration generated at the downstream end of 23 can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in the flow liner 23 can be suppressed, possibility that the flow liner 23 will carry out fatigue damage can be reduced.

[Second Embodiment]
Next, the expansion joint structure 1 concerning 2nd embodiment of this invention is demonstrated using FIG. 4 and FIG.
In the present embodiment, the configuration of the reinforcing member is different from that of the first embodiment. Therefore, the different portions will be mainly described here, and the same portions as those of the first embodiment described above will not be repeated.
In addition, the same code | symbol is attached | subjected to the same member as 1st embodiment.

FIG. 4 is a partial cross-sectional view showing the flow liner portion 11 of the expansion joint structure 1 according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line XX of FIG.
In the present embodiment, the moving member 37 is attached by the bolt 39 so as to extend toward the downstream exhaust pipe 7 on the surface facing the downstream exhaust pipe 7 in the downstream portion of the flow liner 23 (small diameter portion 31). ing. The moving member 37 is a columnar bar, and a plurality of moving members 37 are attached at predetermined intervals in the circumferential direction.

  A piece 41 having a substantially rectangular parallelepiped shape is fixedly attached to the distal end portion of the moving member 37. Since the moving member 37 and the piece 41 are fixed to the flow liner 23, the moving member 37 and the piece 41 have a function of reinforcing the rigidity of the downstream portion of the flow liner 23.

  A guide (guide member) 43 which is a tubular body having a C-shaped cross section is fixedly attached to the inner peripheral surface of the downstream side exhaust gas pipe 7 so that the opening 45 extends in the axial direction L. The width of the opening 45 is larger than the outer diameter of the moving member 37 and smaller than the width of the piece 41. The length of the guide 43 in the axial direction L is sufficiently larger than the length of the piece 41.

In this way, the moving member 37 and the piece 41 attached to the downstream portion of the flow liner 23 have rigidity at the downstream end which is the free end of the flow liner 23, and the piece 41 contacts the guide 43 and supports the flow liner 23. You can increase it. As described above, when the rigidity at the downstream end of the flow liner 23 is increased, the rigidity against the excitation force accompanying the fluctuation of the exhaust gas passing through the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 is increased. The vibration generated at the downstream end of 23 can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in the flow liner 23 can be relieve | moderated, possibility that the flow liner 23 will carry out fatigue damage can be reduced.

In this embodiment, the moving member 37 is attached to the flow liner 23 and the guide 43 is attached to the downstream side exhaust pipe 7. However, the guide 43 is attached to the flow liner 23 and the moving member 37 is attached to the downstream side exhaust pipe 7. You may make it attach.
In this case, the guide 43 and the moving member 37 attached to the flow liner 23 increase the rigidity of the flow liner 23 and have a function of a reinforcing member.

[Third embodiment]
Next, the expansion joint structure 1 concerning 3rd embodiment of this invention is demonstrated using FIGS.
In the present embodiment, the configuration of the flow liner unit 11 is different from that of the second embodiment. Therefore, this different part will be mainly described here, and the same part as that of the above-described embodiment will not be described.
In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned embodiment.

FIG. 6 is a partial cross-sectional view showing the flow liner portion of the expansion joint structure according to the third embodiment of the present invention. FIG. 7 is a partial cross-sectional view showing a portion B of FIG. 8 is a cross-sectional view taken along line YY of FIG.
The flow liner unit 11 of the present embodiment is provided with a downstream flow liner 47 on the downstream side of the flow liner 23.
The downstream side flow liner 47 is a plate material having an overall cylindrical shape. The downstream flow liner 47 is configured to be plane symmetric with respect to the flow liner 23 and the downstream end face of the flow liner 23.

The downstream side flow liner 47 has a small diameter portion 49 that is substantially the same diameter as the small diameter portion 31 of the flow liner 23 on the upstream side, an inclined portion 51 that gradually increases in diameter toward the downstream side, and a downstream exhaust gas pipe 7. And a large-diameter portion 53 having an outer diameter substantially equal to the inner diameter.
The downstream flow liner 47 is disposed so that the upstream end of the small diameter portion 49 faces the downstream end of the flow liner 23, and the downstream large diameter portion 53 is bolted to the inner surface of the downstream exhaust gas pipe 7. The downstream side flow liner 47 is attached to the upstream side exhaust pipe 5 by being fixedly attached to the upstream side.
Therefore, the inclined portion 51 and the small diameter portion 49 are only supported by the large diameter portion 53, and the upstream end of the small diameter portion 49 is a free end.

On the inner peripheral surface of the downstream flow liner 47, an inner rib 55 configured in the same manner as the inner peripheral surface of the flow liner 23 protrudes radially inward from the downstream flow liner 47 and is downstream in the axial direction L. It is attached so as to extend in the axial direction L so as to cover substantially the entire length of the flow liner 47. The inner rib 55 is fixed to the downstream flow liner 47 by, for example, all-around welding. Spot welding may be used instead of full circumference welding.
The inner rib 55 has a function of reinforcing the overall rigidity of the downstream flow liner 47.

  The gap formed between the downstream end of the flow liner 23 and the upstream end of the downstream flow liner 47 can absorb the difference in the amount of expansion and contraction in the axial direction L due to heat between the upstream exhaust gas pipe 5 and the downstream exhaust gas pipe 7. Therefore, it can be made smaller than the gap between the small diameter portion 31 and the downstream side exhaust pipe 7. For this reason, since it can suppress that exhaust gas enters the expansion joint 9, the quantity of the heat insulating material 21 can be reduced by that amount, and the lifetime of a heat insulating material can be lengthened.

  A moving member 57 is attached by a bolt 59 so as to extend toward the downstream exhaust gas pipe 7 on the surface facing the downstream exhaust gas pipe 7 of the upstream side portion of the downstream flow liner 47 (small diameter portion 49). The moving member 57 is a cylindrical bar, and is attached to the same position as the moving member 37 in the circumferential direction.

A piece 61 having a substantially rectangular parallelepiped shape is fixedly attached to the distal end portion of the moving member 57. Since the moving member 57 and the piece 61 are fixed to the downstream side flow liner 47, the moving member 57 and the piece 61 have a function of reinforcing the rigidity of the upstream side portion of the downstream side flow liner 47.
The piece 41 and the piece 61 are connected by an elastic member 62. The elastic member 62 is made of, for example, an elastic material such as spring steel, and can cope with a change in the interval between the piece 41 and the piece 61.

A guide (guide member) 63 that is a tubular body having a C-shaped cross section is fixedly attached to the inner peripheral surface of the downstream side exhaust gas pipe 7 so that the opening 65 extends in the axial direction L.
The length of the guide 63 in the axial direction L is large enough to accommodate the piece 41 and the piece 61.
The width of the opening 65 is larger than the outer diameter of the moving members 37 and 57 and smaller than the width of the guides 43 and 63.

In this way, the moving member 37 and the piece 41 can increase the rigidity at the downstream end which is the free end of the flow liner 23. The moving member 57 and the piece 61 can increase the rigidity at the upstream end which is the free end of the downstream flow liner 47.
As described above, when the rigidity at the downstream end of the flow liner 23 and the upstream end of the downstream flow liner 47 is increased, the exhaust gas passing through the upstream exhaust pipe 5 and the downstream exhaust pipe 7 is changed. Since the rigidity with respect to the excitation force increases, the vibration generated in the downstream end portion of the flow liner 23 and the downstream flow liner 47 can be suppressed.
For this reason, since the magnitude | size of the stress which generate | occur | produces in the flow liner 23 and the downstream flow liner 47 can be relieved, possibility that the flow liner 23 will carry out fatigue damage can be reduced.

[Fourth embodiment]
Next, the expansion joint structure 1 concerning 4th embodiment of this invention is demonstrated using FIG.
In this embodiment, since the configuration of the reinforcing member is different from that of the second embodiment, this different part will be mainly described here, and redundant description of the same part as that of the above-described embodiment will be omitted.
In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned embodiment. Will be described.

  FIG. 9 is a partial cross-sectional view showing the flow liner portion 11 of the expansion joint structure 1 according to the present embodiment.

In the present embodiment, a moving member 67 that is an arc-shaped plate material is attached to the inner peripheral surface of the downstream side exhaust gas pipe 7. The moving member 67 is disposed such that the surface portion extends in the circumferential direction.
An appropriate number of reinforcing ribs 69 are attached to the downstream surface of the moving member 67 by welding so as to extend in the radial direction. The rib 69 may be attached to the upstream surface of the moving member 67 or may be attached to both surfaces. Further, the rib 69 may not be provided.
A plurality of moving members 67 may be provided at intervals in the circumferential direction, or one moving member 67 may be provided. Further, the moving member 67 may extend over the entire circumference.

A piece 71 having a substantially rectangular parallelepiped cross section and extending in the circumferential direction is fixedly attached to the tip of the moving member 67.
A guide (reinforcing member, guide member) 73 that is a tubular body having a C-shaped cross section is provided on a surface facing the downstream exhaust gas pipe 7 in the downstream portion of the flow liner 23 (small diameter portion 31), and the opening 75 is in the circumferential direction. It is fixed and attached so as to extend.
The width of the opening 75 is larger than the axial length of the moving member 67 and the rib 69 and smaller than the width of the piece 71. The circumferential length of the guide 73 is made sufficiently larger than the length of the piece 71, for example, over the entire circumference.

Since the guide 73 is fixed to the flow liner 23, the support member is obtained when the guide 73 is pressed against the moving member 67, and the rigidity of the downstream portion of the flow liner 23 is enhanced. Also, the guide 73 alone is equivalent to increasing the number of structural members, and the rigidity is increased.
As described above, when the rigidity at the downstream end of the flow liner 23 is increased, the rigidity against the excitation force accompanying the fluctuation of the exhaust gas passing through the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 is increased. The vibration generated at the downstream end of 23 can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in the flow liner 23 can be relieve | moderated, possibility that the flow liner 23 will carry out fatigue damage can be reduced.

A leaf spring 77 is mounted between the downstream side exhaust pipe 7 and the downstream end of the guide 73. The leaf spring 77 is elastically deformed as the downstream exhaust gas pipe 7 and the guide 73 change in position and covers the space between them, so that the exhaust gas can be prevented from entering the expansion joint 9.
Therefore, it is possible to effectively suppress the ingress of exhaust gas and accompanying heat into the expansion joint 9 together with the moving member 67 and the guide 73, so that the amount of the heat insulating material 21 installed in the expansion joint 9 is reduced. And the life of the heat insulating material can be extended.

In this embodiment, the guide 73 is attached to the flow liner 23 and the moving member 67 is attached to the downstream side exhaust pipe 7. However, the moving member 67 is attached to the flow liner 23 and the guide 73 is attached to the downstream side exhaust pipe 7. You may make it attach.
In this case, the moving member 67 attached to the flow liner 23 has a function of a reinforcing member that increases the rigidity of the flow liner 23.

[Fifth embodiment]
Next, the expansion joint structure 1 concerning 5th embodiment of this invention is demonstrated using FIG.
In the present embodiment, the configuration of the reinforcing member is different from that of the first embodiment. Therefore, the different portions will be mainly described here, and the same portions as those of the first embodiment described above will not be repeated.
In addition, the same code | symbol is attached | subjected to the same member as 1st embodiment.

FIG. 10 is a partial cross-sectional view showing the flow liner portion 11 of the expansion joint structure 1 according to the present embodiment.
In the present embodiment, a tubular member (reinforcing member) 79 is mounted between the downstream portion of the flow liner 23 and the downstream exhaust gas pipe 7.
The tubular member 79 is a tubular member having a circular cross section, and is formed of a heat resistant material such as metal. The tubular member 79 is configured to have elasticity and is easily deformed.

The tubular member 79 is installed in a state of being slightly crushed by the downstream portion of the flow liner 23 and the downstream exhaust gas pipe 7, and is attached by attachment bolts 81 at a plurality of locations in the circumferential direction.
The opening through which the mounting bolt 81 passes in the tubular member 79 is made larger than the diameter of the mounting bolt 81.
For this reason, the mounting bolt 81 allows the movement of the tubular member 79 and restricts the position so as not to be greatly displaced.

In this way, the downstream portion of the flow liner 23 is restrained from moving by the downstream exhaust gas pipe 7 via the tubular member 79, and a support spring is obtained, so the tubular member 79 is obtained. Can increase the rigidity at the downstream end which is the free end of the flow liner 23.
For this reason, since the vibration which the tubular member 79 generate | occur | produces in the downstream end part of the flow liner 23 can be reduced, the magnitude | size of the stress which generate | occur | produces in the flow liner 23 can be reduced, and there exists a possibility that the flow liner 23 may carry out fatigue damage. Can be reduced.

Since the tubular member 79 covers a gap formed between the flow liner 23 and the downstream side exhaust gas pipe 7, it is possible to suppress the fluid and the heat accompanying it from entering the expansion joint 9 from this gap. .
For this reason, the quantity of the heat insulating material 21 installed in the expansion joint 9 can be reduced.

  Note that the attachment bolt 81 may be attached to the flow liner 23 by welding. In this case, since the play is reduced, the mounting bolt 81 also contributes to improving the rigidity of the flow liner 23.

[Sixth embodiment]
Next, the expansion joint structure 1 concerning 6th embodiment of this invention is demonstrated using FIG. 11 and FIG.
In the present embodiment, the configuration of the reinforcing member is different from that of the first embodiment. Therefore, the different portions will be mainly described here, and the same portions as those of the first embodiment will not be described.
In addition, the same code | symbol is attached | subjected to the same member as 1st embodiment.

FIG. 11 is a partial cross-sectional view showing the flow liner portion 11 of the expansion joint structure 1 according to the present embodiment. FIG. 12 is a partial perspective view showing a part of the flow liner 23 of FIG. 11 as seen from the inner peripheral side.
In the present embodiment, a plurality of circumferentially spaced surfaces (outer peripheral surfaces) of the expansion joint 9 of the flow liner 23 are provided at intervals in the circumferential direction, each protruding in the radial direction, and attached so as to extend in the axial direction L. Outer ribs (outer ribs) 83 made of a plate material are provided.
The outer rib 83 is installed from the inclined portion 33 to the small diameter portion 31 of the flow liner 23, and is fixed to the flow liner 23 by, for example, all-around welding. The outer rib 83 may be spot welding instead of full circumference welding.

The outer rib 83 can increase the rigidity of the flow liner 23, and in particular, can increase the rigidity at the downstream end that is the free end of the flow liner 23.
As described above, when the rigidity at the downstream end of the flow liner 23 is increased, the rigidity against the excitation force accompanying the fluctuation of the exhaust gas passing through the upstream side exhaust pipe 5 and the downstream side exhaust pipe 7 is increased. The vibration which generate | occur | produces in the downstream end part of 23 can be reduced.
For this reason, since the magnitude | size of the stress which generate | occur | produces in the flow liner 23 can be reduced, possibility that the flow liner 23 will carry out fatigue damage can be reduced.

In the present embodiment, a semi-tubular member (reinforcing member) 85 that is a tubular member having a semicircular cross section is mounted between the downstream portion of the flow liner 23 and the downstream exhaust gas pipe 7.
The semi-tubular member 85 is formed of a heat resistant material, for example, a metal. The semi-tubular member 85 is configured to have elasticity and is easily deformed.

Since the semi-tubular member 85 covers a gap formed between the flow liner 23 and the downstream side exhaust pipe 7, it is possible to suppress the fluid and the heat accompanying it from entering the expansion joint 9 from this gap. it can.
For this reason, the quantity of the heat insulating material 21 installed in the expansion joint 9 can be reduced.

  The present invention is not limited to the embodiments described above, and various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Expansion joint structure 5 Upstream side exhaust pipe 7 Downstream side exhaust pipe 9 Expansion joint 11 Flow liner part 21 Heat insulating material 23 Flow liner 27 Horizontal rib 37 Moving member 41 Piece 43 Guide 47 Downstream flow liner 63 Guide 73 Guide 77 Leaf spring 79 Tubular member 83 Outer rib 85 Semi-tubular member

Claims (7)

An expansion joint for connecting the upstream piping and the downstream piping arranged at intervals in the axial direction so that the spacing can be adjusted; and
A flow liner that has a substantially cylindrical shape with an upstream end fixed to the inner surface of the upstream pipe, extends downstream to cover the expansion joint, and is arranged at a radial interval; and An expansion joint structure comprising:
A downstream end of the flow liner is provided with a reinforcing member that increases the rigidity of the flow liner,
A plurality of the reinforcing members are provided on the surface of the flow liner on the side of the expansion joint part at intervals in the circumferential direction, each projecting in the radial direction and attached so as to extend in the axial direction An expansion joint structure characterized by being an outer rib composed of   2. The expansion joint according to claim 1, wherein the reinforcing member is a transverse rib in which an arc-shaped plate is attached to a downstream end of the flow liner so as to extend in a circumferential direction. Construction. A movement that is attached to one of the downstream portion of the flow liner and the downstream piping so as to extend toward the downstream portion of the other flow liner or the downstream piping, and has a piece at the tip. A member, and a guide member that is attached to the downstream part of the other flow liner or the downstream pipe, and that guides the piece part to be movable,
The expansion joint structure according to claim 1, wherein the reinforcing member is a moving member or a guide member attached to a downstream portion of the flow liner.   4. The moving member is an arc-shaped plate, and is attached so as to extend in the circumferential direction, and the opening of the guide member is extended in the circumferential direction. The expansion joint structure according to 1.   The said reinforcing member is comprised by the tubular member attached between the downstream part of the said flow liner, and the said downstream piping, or the semi-tubular member, The Claim 1 or Claim characterized by the above-mentioned. 2. The expansion joint structure according to 2.   The elastic member which covers the space formed between the said flow liner and the said downstream piping is mounted | worn with the downstream end of the said flow liner. Expansion joint structure.   A downstream flow liner configured to be plane-symmetric with respect to a downstream end surface of the flow liner is provided downstream of the flow liner, the upstream end of the downstream flow liner and the downstream of the flow liner. The expansion joint structure according to any one of claims 1 to 6, wherein the expansion joint structure is attached so as to face the end.

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