JP3120353B2 - Exhaust silencer mounting structure for gas turbine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an exhaust silencer mounting structure for a gas turbine.

[0002]

2. Description of the Related Art A gas turbine used as a power source of a portable generator is required to be small and light (Japanese Patent Application Laid-Open No. H05-205572).
187256, reference).

As an exhaust silencer mounting structure for a gas turbine of this type, there is a conventional structure as shown in FIG.

[0004] Explaining this, the exhaust gas discharged from an axial flow turbine (not shown) is diffused by a diffuser 7.
1 is led to the exhaust silencer 73 via the duct 72 and discharged from the exhaust silencer 73 to the outside.

[0005] A flange 74 on the diffuser 71 side and a flange 76 on the duct 72 side are joined to each other and fastened through a plurality of bolts 76.

The outer shapes of the duct 72 and the exhaust silencer 73 are formed larger than the outer shape of the diffuser 71. For this reason, the duct 72 extends cylindrically from the flange 76, and a maintenance space necessary for attaching and detaching the bolt 76 is secured in the axial direction.

[0007]

However, in such a conventional exhaust silencer mounting structure for a gas turbine, in order to secure a maintenance space necessary for attaching and detaching the bolt 72, the duct 72 is formed cylindrically from the flange 76. It is necessary to extend the length of the gas turbine, which leads to an increase in the size of the gas turbine.

In order to ensure the rigidity of the support of the duct 72 and the exhaust silencer 73 by the flange 75, the thickness of each part is increased, and the weight is increased.

Further, since each bolt 76 is disposed inside the outer shape of the duct 72 and the exhaust silencer 73, a tool for turning the bolt 76 when the duct 72 is attached or detached cannot be inserted from the axial direction of the bolt 76. 76
When the surrounding area is covered with a housing or the like, the number of work steps required for attaching and detaching the duct 72 increases.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to reduce the size and weight of an exhaust silencer mounting structure for a gas turbine while ensuring maintainability.

[0011]

According to a first aspect of the present invention, there is provided an exhaust silencer mounting structure for a gas turbine, comprising: a flow path member for guiding exhaust gas discharged from the turbine; In a gas turbine exhaust silencer mounting structure for connecting a large exhaust silencer, a support member projecting outside the outer shape of the exhaust silencer is connected to the flow path member, and a bolt for fastening the exhaust silencer to the support member is provided. It is arranged outside the outline of.

According to a second aspect of the present invention, there is provided a gas turbine exhaust silencer mounting structure for recovering heat of an exhaust gas by passing exhaust gas discharged from the turbine and compressed air sent from a compressor to a combustor. Equipped with
An exhaust silencer for guiding exhaust gas discharged from a heat exchanger, wherein the exhaust silencer has an outer shape larger than the heat exchanger. In a gas turbine exhaust silencer mounting structure, a support member projecting outward from the outer shape of the exhaust silencer to the heat exchanger. And a bolt for fastening the support member and the exhaust silencer, and the bolt is disposed outside the outer shape of the exhaust silencer.

According to a third aspect of the present invention, in the gas turbine exhaust silencer mounting structure according to the second aspect, the exhaust silencer is formed at an inlet edge for introducing exhaust gas from the heat exchanger into the exhaust silencer, and the support member is provided with a support member. A flange is formed to join the inlet edge via a gasket, and a projecting member projecting from the flange to the outside of the outer shape of the exhaust silencer is formed, and a bolt for fastening the projecting member to the exhaust silencer is provided.

According to a fourth aspect of the present invention, there is provided the exhaust silencer mounting structure for a gas turbine according to the third aspect, wherein the inlet edge of the exhaust silencer is formed in a quadrangular shape, and the four protrusions and the exhaust silencer are fastened to each other. And the bolts are arranged so as to surround the inlet edge of the exhaust silencer.

[0015]

In the exhaust silencer mounting structure for a gas turbine according to claim 1, the bolt is projected outside the outer shape of the exhaust silencer, so that a tool such as a screwdriver for turning the bolt when inserting and removing the exhaust silencer is inserted. Space is secured beside the exhaust silencer.

As a result, since there is no need to secure a maintenance space for inserting a tool or the like between the exhaust silencer and the flow path member, a tubular duct or the like provided between the exhaust silencer and the flow path member is eliminated, and the exhaust air is eliminated. Since the silencer and the flow path member can be arranged close to each other, the size and weight of the gas turbine can be reduced.

In the exhaust silencer mounting structure for a gas turbine according to the second aspect of the present invention, the bolt is projected outside the outer shape of the exhaust silencer, so that a tool such as a screwdriver for turning the bolt when inserting and removing the exhaust silencer is inserted. Space is secured beside the exhaust silencer.

As a result, since there is no need to secure a maintenance space for inserting a tool or the like between the exhaust silencer and the heat exchanger, a tubular duct or the like provided between the exhaust silencer and the heat exchanger is eliminated, and the exhaust gas is eliminated. Since the silencer and the heat exchanger can be arranged close to each other, the size and weight of the gas turbine can be reduced.

In the gas turbine exhaust silencer mounting structure according to the third aspect, the gasket is compressed between the flange and the inlet edge by an axial force of a bolt for fastening the projecting member and the exhaust silencer, and the gasket is interposed therebetween. Airtightness between the flange and the entrance edge is achieved.

In the gas turbine exhaust silencer mounting structure according to the fourth aspect, the four bolts are arranged so as to surround the square entrance edge, and the flange and the entrance edge are formed by the axial force of each bolt. The surface pressure acting on the gasket compressed between them is evenly distributed, and the airtightness between the flange and the inlet edge is ensured.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a gas turbine used as a power source of a portable generator will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the gas turbine 1 comprises the basic components of a compressor 2, a combustor 3, and a turbine 4. The turbine rotor 11 driven by the high-temperature gas and the centrifugal compressor impeller 12 that pressurizes the low-temperature gas are coaxially connected via a shaft 13, and the shaft 13 is cantilevered via a pair of rolling bearings 15, A generator (not shown) is driven via a gear 14 formed at the tip.

The high-temperature exhaust gas discharged from the turbine 4 flows into the heat exchanger (heat exchanger) 5 from the turbine housing 26 through the diffuser 25 as shown by an arrow in the figure, and recovers the heat of the exhaust gas. The fuel consumption rate is reduced.

The heat exchanger 5 has a flow path (not shown) through which high-temperature exhaust gas sent from the turbine 4 passes through the shaft 13.
And is arranged along the flow direction of the exhaust gas discharged from the turbine 4. A flow path through which the low-temperature compressed air sent from the compressor 2 passes is formed in parallel with and opposed to the exhaust gas flow path via a heat transfer wall.

The heat exchanger 5 and the combustor 3 are arranged parallel to each other, and a chamber 21 that covers both the heat exchanger 5 and the combustor 3.
Is provided, and the low-temperature compressed air discharged from the compressor 2 passes through this chamber 21 and is guided to the heat exchanger 5.

The low-temperature compressed air fed from the compressor impeller 12 is supplied to the flange 22 as indicated by an arrow in the drawing.
Flows into the chamber 21 through the annular flow path 23 formed at the bottom. The chamber 21 is fastened to the outer peripheral end of the flange 22 via a plurality of bolts 24.

The heat exchanger 5 has an inlet 5A for low-temperature compressed air that opens into the chamber 21. This inlet 5
The compressed air flowing in from A and heated through the heat exchanger 5 is bent by the head 5C and then flows into the combustor 3 via the joining flange 5B.

In the combustor 3, the fuel injected from the fuel injection valve 6 is burned to become a high-temperature gas, and the combustion gas flowing out of the combustor 3 is bent in the flow passage 28 and then is bent between the turbine housing outer peripheral walls 34. The fluid is guided to the turbine rotor 11 through a flow path 29 which is formed in a spiral shape, and expands to apply a rotational force to the turbine rotor 11.

The heat insulating material 33 is provided on the flange 22 side and insulates the combustion gas guided to the turbine rotor 11.

A cap 35 attached to the end of the combustor 3
A fuel injection valve 6 and a spark plug 7 are attached to the rim. The low-temperature compressed gas taken out of the chamber 21 flows into the flow path 36 formed in the cap 35 having a hollow structure from the inlet 37 through a pipe through a pipe, and the combustor outer chamber 34 flows through a plurality of outlets 38.
By cooling the fuel, the fuel injection valve 6 and the spark plug 7 are cooled and the combustor 3 is insulated.

The exhaust gas flowing out of the heat exchanger 5 is exhausted from the outlet pipe 50 to the outside while being silenced through the exhaust silencer 8. The exhaust silencer 8 enlarges a flow path for guiding the exhaust gas, and reduces a sound pressure generated by a pressure wave of the exhaust gas via a sound absorbing material.

The exhaust silencer 8 is arranged along the shaft 13 of the gas turbine 1 with respect to the heat exchanger 5. The exhaust silencer 8 and the heat exchanger 5 are each formed in a rectangular box shape. The external dimensions of the exhaust silencer 8 are larger than the heat exchanger 5.

Between the heat exchanger 5 and the exhaust silencer 8,
A rectangular frame-shaped support member 9 protruding outside the outer shape of the heat exchanger 5 is provided, and four bolts 56 for fastening the heat exchanger 5 and the exhaust silencer 8 via the support member 9 are connected to the heat exchanger. 5 and is arranged to protrude outside the outer shape.

As shown in FIG. 2, the support member 9 includes a rectangular frame-shaped flange 52 fastened to the heat exchanger 5 via a plurality of bolts 51, and left and right side portions 52 of the flange 52.
a, and a projection member 53 fixed to the base member 52b by welding.

Each bolt 51 has a nut 55 screwed thereto.
And the heat exchanger 5 is fastened to the flange 52 via. Holes 54 for inserting the bolts 51 are formed in the flange 52 at predetermined intervals.

A flange 59 through which each bolt 56 passes is fixed to the exhaust silencer 8. Each bolt 56 passes through the flange 59 and the hole 57 of the overhang member 53.

At the upper and lower ends of each overhanging member 53, each bolt 56
A hole 57 is formed to allow the bolt 5 to pass through.
A nut 58 for screwing 6 is fixed. The hole 57
A screw for screwing each bolt 56 is formed on the nut 5
8 may be abolished.

The inlet edge 61 connected to the heat exchanger 5 of the exhaust silencer 8 has a rectangular frame shape and is formed so as to protrude toward the heat exchanger 5. A gasket 62 is interposed between the inlet edge 61 of the exhaust silencer 8 and the flange 52, and airtightness between them is ensured.

The four bolts 56 are connected to the exhaust silencer 8 via the extension members 53 and the flange 59 of the support member 9.
Are arranged so as to protrude outward from the outer shape of. 4 bolts 5
Numeral 6 is arranged so as to surround the rectangular inlet edge 61 and the rectangular box-shaped exhaust silencer 8 respectively.

The operation will be described below.

At the time of mounting the exhaust silencer 8, each bolt 56 is rotated via a tool such as a screwdriver inserted from the side of the exhaust silencer 8, and screwed into each nut 58. When each bolt 56 is tightened, the gasket 62 is attached to the flange 52 by the axial force of each bolt 56.
And between the inlet silencer 8 and the inlet edge 61 of the exhaust silencer 8, so that the airtightness between them is ensured.

Since the exhaust silencer 8 has a square box-like shell structure, it has sufficient rigidity against the axial force of each bolt 56 hanging on each flange 59 and the reaction force of the gasket 62 hanging on the inlet edge 61. Exhaust silencer 8 secured
The thickness is reduced to reduce the weight.

When the exhaust silencer 8 is removed, each bolt 56 is rotated via a tool such as a screwdriver inserted from the side of the exhaust silencer 8 to release the screw engagement with the nut 58.

Since the bolts 56 are arranged so as to protrude outside the outer shape of the exhaust silencer 8, a work space for inserting a tool such as a screwdriver for turning the bolts 56 when the exhaust silencer 8 is attached / detached is provided on the exhaust silencer 8 side. To be secured.

As a result, the exhaust silencer 8 and the heat exchanger 5
Since there is no need to secure a maintenance space for inserting tools and the like between the exhaust silencer 8 and the heat exchanger 5, a tubular duct or the like provided between the exhaust silencer 8 and the heat exchanger 5 is eliminated.
And the heat exchanger 5 can be arranged close to each other, so that the gas turbine 1 can be made compact and lightweight.

The four bolts 56 are connected to the square entrance edge 6.
A surface acting on the gasket 62 compressed between the flange 52 and the inlet edge 61 by the axial force of each bolt 56 due to the structure arranged so as to surround the outer shape of the exhaust silencer 8 in the form of a rectangular box. The pressure is evenly distributed, and the airtightness between the flange 52 and the inlet edge 61 is ensured.

[0047]

As described above, the gas turbine exhaust silencer mounting structure according to the first aspect has a flow path member for guiding exhaust gas discharged from the turbine, and the outer shape of the flow path member is the flow path member. In a gas turbine exhaust silencer mounting structure for connecting a larger exhaust silencer, a support member projecting outside the outer shape of the exhaust silencer is connected to the flow path member, and a bolt for fastening the exhaust silencer to the support member is provided. Since it is located outside the outer shape of the silencer, a work space for inserting a tool such as a screwdriver that turns a bolt when attaching / detaching the exhaust silencer is secured on the side of the exhaust silencer, and the exhaust silencer and the flow path member are arranged close to each other. Gas turbines can be made more compact and lighter while maintaining maintainability. .

According to a second aspect of the present invention, there is provided a gas turbine exhaust silencer mounting structure for exchanging exhaust gas discharged from a turbine and compressed air sent from a compressor to a combustor to recover heat of the exhaust gas. Equipped with
An exhaust silencer for guiding exhaust gas discharged from a heat exchanger, wherein the exhaust silencer has an outer shape larger than the heat exchanger. In a gas turbine exhaust silencer mounting structure, a support member projecting outward from the outer shape of the exhaust silencer to the heat exchanger. And a bolt for fastening the support member and the exhaust silencer, and the bolt is located outside the outer shape of the exhaust silencer.Therefore, the work space for inserting a tool such as a screwdriver that turns the bolt when attaching / detaching the exhaust silencer is close to the exhaust silencer side. , And the exhaust silencer and the heat exchanger can be arranged close to each other, so that the gas turbine can be made compact and lightweight while maintaining maintainability.

According to a third aspect of the present invention, in the exhaust silencer mounting structure for a gas turbine according to the second aspect, the exhaust silencer is formed at an inlet edge for introducing the exhaust gas from the heat exchanger into the exhaust silencer, and the support member is provided with a support member. In addition to forming a flange that joins the inlet edge via a gasket, and forming a projecting member that protrudes outside the outer shape of the exhaust silencer from the flange, a bolt that fastens the projecting member and the exhaust silencer is provided. The gasket is compressed between the flange and the inlet edge by the axial force of the bolt for fastening the member and the exhaust silencer, and the airtightness between the flange and the inlet edge is established via the gasket.

According to a fourth aspect of the present invention, in the exhaust silencer mounting structure for a gas turbine according to the third aspect, the inlet edge of the exhaust silencer is formed in a quadrangular shape, and the four protrusions and the exhaust silencer are fastened to each other. Since each bolt is arranged so as to surround the inlet edge of the exhaust silencer, the surface pressure acting on the gasket compressed between the flange and the inlet edge by the axial force of each bolt is evenly distributed, Airtightness between the flange and the entrance edge is achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gas turbine according to an embodiment of the present invention.

FIG. 2 is a perspective view of the support member.

FIG. 3 is a sectional view of a gas turbine showing a conventional example.

[Description of Signs] 1 Gas turbine 2 Compressor 3 Combustor 4 Turbine 5 Heat exchanger 8 Exhaust silencer 9 Support member 52 Flange 53 Overhang member 56 Bolt 61 Inlet edge 62 Gasket

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-158468 (JP, A) JP-A-7-279685 (JP, A) JP-A-7-224685 (JP, A) JP-A-1- 158529 (JP, A) JP-A-2-238132 (JP, A) JP-A 63-71436 (JP, U) JP-A 51-157748 (JP, U) JP-A 57-204409 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) F01D 25/30 F02C 7/00 F02C 7/08 F02C 7/18 F02C 7/24 F02C 7/045

Claims (4)

(57) [Claims] An exhaust silencer mounting structure for a gas turbine, comprising: a flow path member for guiding exhaust gas discharged from a turbine, wherein the flow path member is connected to an exhaust silencer whose outer shape is larger than the flow path member. An exhaust silencer mounting structure for a gas turbine, comprising: a support member that protrudes outside the outer shape of the exhaust silencer is connected; a bolt that fastens the exhaust silencer to the support member; and the bolt is disposed outside the outer shape of the exhaust silencer. . 2. A heat exchanger for recovering heat of exhaust gas by passing exhaust gas discharged from a turbine and compressed air sent from a compressor to a combustor, wherein the exhaust gas discharged from the heat exchanger is provided. An exhaust silencer mounting structure for a gas turbine, wherein the outer shape of the exhaust silencer is larger than the heat exchanger. A support member projecting outside the outer shape of the exhaust silencer is connected to the heat exchanger, and the support member and the exhaust silencer are provided. An exhaust silencer mounting structure for a gas turbine, comprising: a bolt for fastening the exhaust silencer; 3. An exhaust silencer is formed at an inlet edge for introducing exhaust gas from a heat exchanger, a flange is formed on a support member to join the inlet edge via a gasket, and an outer shape of the exhaust silencer is formed from the flange. The exhaust silencer mounting structure for a gas turbine according to claim 2, further comprising: a projecting member projecting further outward; and a bolt for fastening the projecting member to the exhaust silencer. 4. An exhaust silencer having an inlet edge formed in a quadrangular shape, comprising four bolts for fastening an overhang member and the exhaust silencer, each of which is arranged so as to surround the inlet edge of the exhaust silencer. The exhaust silencer mounting structure for a gas turbine according to claim 3, wherein: