KR102025147B1 - Structure for combining throttle plate of bucket, rotor and gas turbine - Google Patents

Abstract

The present invention relates to a throttle plate coupling structure of the bucket, and is formed to penetrate along the longitudinal direction of the dovetail of the cooling fluid inlet hole and a plurality of the plurality of cooling fluid inlet holes disposed at predetermined intervals along the longitudinal direction at the end of the dovetail of the bucket, The coupling portion disposed adjacent to the inlet hole and the insertion portion is inserted into the coupling portion, the inner channel of the bucket and a plurality of slots communicating with the inlet hole may be configured to include a control member formed along the longitudinal direction, the present invention According to the present invention, it is possible to prevent the material deformation due to the brazing treatment by improving the coupling method of the throttle plate, and improve the slot structure to induce effective flow of the cooling fluid.

Description

STRUCTURE FOR COMBINING THROTTLE PLATE OF BUCKET, ROTOR AND GAS TURBINE}

The present invention relates to a throttle plate coupling structure of a bucket, and more particularly, to a coupling and slot structure of a throttle plate (throttle plate) disposed at the end of the dovetail of the bucket and connected to the internal flow path of the bucket to introduce a cooling fluid will be.

A turbine is a mechanical device that obtains rotational force by impulse or reaction force by using a flow of a compressive fluid such as steam or gas, and includes a steam turbine using steam and a gas turbine using hot combustion gas.

Among these, the gas turbine is largely composed of a compressor, a combustor, and a turbine. The compressor is provided with an air inlet for introducing air, and a plurality of compressor vanes and compressor blades are alternately arranged in the compressor casing.

The combustor supplies fuel to the compressed air compressed in the compressor and ignites the burner to produce combustion gas of high temperature and high pressure.

In the turbine, a plurality of turbine vanes and a turbine blade are alternately arranged in the turbine casing.

In addition, the rotor is disposed so as to pass through the center of the compressor, the combustor, the turbine, and the exhaust chamber.

Both ends of the rotor are rotatably supported by bearings. A plurality of disks are fixed to the rotor, and the respective blades are connected to each other, and the drive shaft of the generator is connected to the end of the exhaust chamber side.

Since these gas turbines do not have reciprocating mechanisms such as pistons in four-stroke engines, they do not have mutual frictional parts, such as piston-cylinders, so that the consumption of lubricant is extremely low. There is an advantage.

Briefly describing the operation of the gas turbine, the compressed air in the compressor is mixed with fuel and combusted to produce a high temperature combustion gas, which is injected into the turbine side. The injected combustion gas passes through the turbine vanes and turbine blades to generate a rotational force, which causes the rotor to rotate.

In the operation of such gas turbines, the cooling of the bucket is one of the important technical elements. 1, a throttle plate 3 is provided in which a cooling fluid enters into an internal flow path for cooling a conventional bucket 1.

The throttle plate 3 is arranged at the end of the dovetail 2 of the bucket 1. The throttle plate 3 has a plurality of slots 4 are formed along the longitudinal direction of the dovetail 2, the slots 4 are connected to the internal flow path of the bucket, and guides the inflow of the cooling fluid.

By the way, the conventional throttle plate (3) is bonded to the end of the dovetail (2) by brazing (Brazing; A). This joining method complicates the process and there is a possibility of changing the properties of the material due to the heat treatment, which may cause the durability or strength degradation of the part.

United States Patent Number: US 2011-0236206 A1

The present invention has been made to solve the problems in the related art as described above, an object of the present invention is disposed at the end of the dovetail of the bucket and is connected to the internal flow path of the bucket throttle plate (throttle plate) for introducing a cooling fluid To provide a slot structure for efficient flow of the cooling fluid.

The present invention for achieving the above object relates to a throttle plate coupling structure of the bucket, a plurality of cooling fluid inlet hole and a plurality of dovetail in the longitudinal direction disposed at a predetermined distance along the longitudinal direction at the end of the dovetail of the bucket It is formed to penetrate along, the coupling portion disposed adjacent to the inlet hole and inserted into the coupling portion, a plurality of slots in communication with the inner flow path and the inlet hole of the bucket is formed along the longitudinal direction includes a control member can do.

In addition, in the embodiment of the present invention, the slot of the adjusting member may be inclined toward the inflow direction of the cooling fluid.

In addition, in the embodiment of the present invention, the slot of the adjustment member may have a tapered shape in which the inflow cross-sectional area is reduced toward the inner flow path of the bucket from the outside.

In addition, in the embodiment of the present invention, at least some of the slots of the adjusting member may be formed in another inflow cross-sectional area.

In addition, in the embodiment of the present invention, a portion of both ends of the adjustment member may be formed incision.

In addition, in the embodiment of the present invention, at least some of the plurality of slots of the adjustment member may be formed in another inflow cross-sectional area.

In addition, in the embodiment of the present invention, the adjustment member is made of a plurality of control plates are stacked, the plurality of control plates may include a different slot shape.

In addition, in the embodiment of the present invention, the adjustment plate is disposed in the inlet hole direction side in the coupling portion, the first plate including a slot formed at the first tapered angle and the inner flow path direction of the bucket in the coupling portion And a second plate disposed at a side and including a slot formed at a second tapered angle, wherein the second tapered angle may be configured to be larger than the first tapered angle.

In addition, in the embodiment of the present invention, the control plate further includes a third plate disposed between the second plate and the inner flow path of the bucket in the coupling portion, the third plate including a slot formed at a third tapered angle, The third taper angle may be larger than the second taper angle.

In addition, in the embodiment of the present invention, the control plate is disposed in the inlet hole direction side in the coupling portion, the first plate including a slot formed inclined toward the inflow direction of the cooling fluid and the inside of the bucket in the coupling portion It may include a second plate disposed on the flow path direction side, including a slot formed at the fourth tapered angle.

In addition, in the embodiment of the present invention, the slot of the second plate may be divided into a plurality of inlet cross-sectional areas within the inlet cross-sectional area of the slot of the first plate.

In addition, the embodiment of the present invention further includes a third plate disposed between the second channel and the inner flow path of the bucket in the coupling portion, the third plate including a slot formed with a fifth tapered angle, the fifth tapered angle The inflow cross-sectional area may be expanded toward the inner flow path of the bucket in the second plate.

In addition, in the embodiment of the present invention, the control plate, the first plate including a slot disposed in the direction of the inlet hole in the coupling portion rounded to a predetermined curvature and the inner flow path direction of the bucket in the coupling portion And a second plate disposed at the side and including a slot formed at a sixth taper angle.

In addition, the inventors of the present invention is a rotor including a bucket including a throttle plate coupling structure of the bucket and a bucket mounting portion to which the dovetail of the bucket is coupled at a predetermined interval along a circumferential direction and the rotor along the axial direction. The disk may comprise a rotor arranged in a plurality of rows.

In addition, the gas turbine of the present invention is disposed on the casing and the front side into which the working fluid flows in the casing, and is arranged on the intermediate side of the casing and the compressor section provided to compress the working fluid, and connected to the compressor section, and compressed A rear end of the casing and a combustor which is provided to combust the mixed working fluid with fuel, the turbine section being connected to the combustor and arranged at the rear end of the casing and the turbine section provided to generate power from the combustion gas, A diffuser connected to the turbine section and provided to discharge the working fluid, wherein the rotating body may be configured to connect the compressor section and the turbine section to one rotation shaft.

According to the present invention, the coupling method of the throttle plate is improved by the insertion method to prevent material deformation due to the brazing treatment, which has been a problem in the conventional bonding structure.

In addition, by improving the slot structure of the throttle plate to induce an effective flow of the cooling fluid, it is possible to increase the cooling capacity by the cooling fluid entering the internal flow path of the bucket.

1 is a view showing a throttle plate coupling structure bonded to the end of the dovetail of the conventional bucket.
Figure 2 shows the present invention throttle plate coupling structure disposed at the end of the dovetail of the bucket.
3 is a partial cross-sectional view taken along line BB ′ of FIG. 2;
Figure 4 is a partial side cross-sectional view showing one embodiment of the slot shape of the throttle plate of the present invention.
Figure 5 is a partial side cross-sectional view showing another form of the slot shape of the throttle plate of the present invention.
Figure 6 is a partial side cross-sectional view showing another form of the slot shape of the throttle plate of the present invention.
Figure 7 is a partial side cross-sectional view showing another form of the laminated structure of the throttle plate and the slot shape of the present invention.
Figure 8 is a partial side cross-sectional view showing another form of the laminated structure and the slot shape of the throttle plate of the present invention.
Figure 9 is a partial side cross-sectional view showing another form of the laminated structure of the throttle plate and the slot shape of the present invention.
Figure 10 is a bottom view of the slot shape of the throttle plate of the present invention.
Figure 11 is a bottom view showing the incision of the throttle plate in the present invention.
The figure which shows one form about the gas turbine to which this invention is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description of the present invention, the configuration of the gas turbine 100 will be described with reference to the drawings.

Referring to FIG. 12, the gas turbine basically includes a casing 200 that forms an external appearance, a compressor section 400 that compresses air, a combustor 500 that burns air, and a combustor. A turbine section 600 generating power using gas, a diffuser 700 exhausting exhaust gas, and a rotor connecting the compressor section 400 and the turbine section 600 to transmit rotational power; 300).

Thermodynamically, the compressor section corresponding to the upstream side of the gas turbine receives external air and undergoes adiabatic compression. Compressed air enters the combuster section, mixes with fuel and undergoes isocombustion, and combustion gas enters the turbine section downstream of the gas turbine and undergoes adiabatic expansion. .

Referring to the flow direction of the air, the compressor section 400 is located in front of the casing 10, the turbine section 600 is provided at the rear.

A torque tube 320 is provided between the compressor section 400 and the turbine section 600 to transmit the rotational torque generated in the turbine section 600 to the compressor section 400.

The compressor section 400 is provided with a plurality of compressor rotor disks 410 (for example, 14 sheets), and the respective compressor rotor disks 410 are fastened so as not to be spaced in the axial direction by the tie rods 310. do.

The centers of the compressor rotor disks 410 are aligned with each other along the axial direction with the tie rods 310 passing through them. In the vicinity of the outer circumferential portion of the compressor rotor disk 410, a flange (not shown) coupled to a neighboring rotor disk to prevent relative rotation is formed to protrude in the axial direction.

A plurality of blades 420 (or buckets) are radially coupled to the outer circumferential surface of the compressor rotor disk 410. Each blade 420 has a dove tail portion (not shown) and is fastened to the compressor rotor disk 410.

The dovetail part may be of a tangential type and an axial type. This may be selected according to the required structure of a commercially available gas turbine. In some cases, the compressor blade 420 may be fastened to the compressor rotor disk 410 using a fastening device other than the dovetail.

At this time, the inner circumferential surface of the compressor section 400 of the casing 200 is a vane (or nozzle) for the relative rotational movement of the compressor blade 420 is mounted on the diaphragm (not shown) Can be.

The tie rod 310 is disposed to penetrate through the center of the plurality of compressor rotor disks 410, one end of which is fastened in the compressor rotor disk 410 located at the most upstream side, and the other end thereof is the torque tube 320. It is fixed to).

Since the tie rod 310 may be formed in various structures according to gas turbines, the tie rod 310 is not necessarily limited to the form shown in the drawings.

One tie rod 310 may have a form penetrating the central portion of the compressor rotor disk 410, a plurality of tie rods 310 may be arranged in a circumferential shape, can be used in combination thereof .

Although not shown, the compressor of the gas turbine may be provided with a vane serving as a guide vane at the next position of the diffuser to increase the pressure of the fluid and then adjust the flow angle of the fluid entering the combustor to the design flow angle. It is called a desworler.

The combustor 500 mixes and combusts the introduced compressed air with fuel to produce a high-temperature, high-pressure combustion gas of high energy, and is heat resistant that the components of the combustor 500 and the turbine section 600 can withstand the isostatic combustion process. The combustion gas temperature is raised to the limit.

The combustor 500 constituting the combustion system of the gas turbine may be arranged in a casing 200 formed in the form of a cell, the combustor 500 is a burner (Burner) including a fuel injection nozzle and the combustion chamber A combustor liner to form and a transition piece that is the connection of the combustor and turbine section 600.

Specifically, the liner provides a combustion space in which fuel injected by the fuel nozzle is mixed with the compressed air of the compressor section 400 and combusted. Such a liner may include a flame barrel providing a combustion space in which fuel mixed with air is combusted, and a flow sleeve surrounding the flame barrel to form an annular space. In addition, the fuel nozzle is coupled to the front end of the liner, the spark plug is coupled to the side wall.

On the other hand, the transition piece is connected to the rear end of the liner so that the combustion gas combusted by the spark plug can be sent to the turbine section 600 side.

The transition piece is cooled by compressed air supplied from the compressor section 400 so that the outer wall is prevented from being damaged by the high temperature of the combustion gas.

To this end, the transition piece is provided with holes for cooling to inject air therein, and the compressed air flows to the liner side after cooling the body therein through the holes.

Cooling air that cools the above-described transition piece flows into the annular space of the liner, and compressed air is provided to the outer wall of the liner through cooling holes provided in the flow sleeve to collide with the outside of the flow sleeve. .

On the other hand, in the turbine section 600, while the high-temperature, high-pressure combustion gas from the combustor 500 expands, impulse and reaction force is applied to the rotary blades of the turbine section 600 to convert it into mechanical energy.

The mechanical energy obtained in the turbine section 600 is supplied with the energy required to compress the air in the compressor section 400 and the rest is used to drive the generator to produce power.

The turbine section 600 is configured by alternately arranging a plurality of vanes and rotor blades in a vehicle compartment, and rotationally driving an output shaft to which a generator is connected by driving the rotor blades by combustion gas.

To this end, the turbine section 300 is provided with a plurality of turbine rotor disks 610. Each turbine rotor disk 610 is basically similar in shape to the compressor rotor disk 410.

The turbine rotor disk 610 also has a flange (not shown) provided for coupling with a neighboring turbine rotor disk 620 and includes a plurality of radially disposed turbine blades 620 (or buckets). do. The turbine blade 620 may also be coupled to the turbine rotor disk 610 in a dovetail manner.

At this time, the inner circumferential surface of the turbine section 600 of the casing 200, vanes (or nozzles) for the relative rotational movement of the turbine blade 620 is mounted on the diaphragm (not shown) Can be.

In the gas turbine having the structure as described above, the introduced air is compressed in the compressor section 400, combusted in the combustor 500, and then moved to the turbine section 600 to drive power generation, and the diffuser 700 is driven. Through the atmosphere.

Here, the torque tube 320, compressor rotor disk 410, compressor blade 420, turbine rotor disk 610, turbine blade 620, tie rod 310, and the like as a rotating component integrally the rotor ( 300) or a rotating body. The casing 200, vanes (not shown), diaphragms (not shown), etc. may be referred to as stators or fixtures as a non-rotating component.

One general structure of a gas turbine is as described above, and the following describes the present invention applied to such a gas turbine.

Figure 2 is a view showing a throttle plate coupling structure of the present invention disposed at the end of the dovetail of the bucket, Figure 3 is a partial cross-sectional view of BB 'in Figure 2, Figure 4 is a form for the slot shape of the throttle plate of the present invention Partial side cross-sectional view showing.

2 to 4, the coupling structure 10 of the present invention throttle plate may be configured to include an inlet hole 25, the coupling portion 27 and the adjustment member (50).

The inflow hole 25 may be arranged in plurality in the longitudinal direction at the end of the dovetail 23 of the bucket 20 at predetermined intervals, and the cooling fluid is introduced.

The coupling part 27 may be formed to penetrate along the longitudinal direction of the dovetail 23 of the bucket 20, and may be disposed adjacent to the inflow hole 25.

The adjusting member 50 may be inserted into the coupling part 27, and a plurality of slots 51 communicating the inner flow path (not shown) of the bucket 20 and the inflow hole 25 may be in a longitudinal direction. It can be formed along.

As shown in FIG. 2, the adjusting member 50 may be inserted along the coupling part 27 at one end surface of the dovetail 23 of the bucket 20, as shown in FIG. The adjusting member 50 may be disposed adjacent to the inflow hole 25.

When the bucket mounting portion 32 of the rotor disk 30 and the dovetail 23 of the bucket 20 are inserted in the axial direction, a gap exists between the dovetail 23 and the bucket mounting portion 32 to compensate for thermal expansion. The cooling fluid may be introduced into the inflow hole 25 through this interval.

The cooling fluid introduced into the inlet hole 25 is guided through the slot 51 of the adjusting member 50 as shown in FIG. 4 to flow into the internal flow path of the bucket 20 to cool the bucket 20. .

On the other hand, Figure 5 is a partial side cross-sectional view showing another form of the slot shape of the throttle plate in the present invention. Referring to FIG. 5, another form of the slot 52 of the throttle plate may be inclined in one direction.

At this time, the flow direction of the cooling fluid may be considered. That is, the inclination of the slot 52 is formed in the flow direction of the cooling fluid in consideration of the direction in which the cooling fluid flows into the gap between the bucket mounting portion 32 and the dovetail 23. In this case, the flow of the cooling fluid may be smoother.

And, Figure 6 is a partial side cross-sectional view showing another form of the slot shape of the throttle plate in the present invention. Referring to FIG. 6, another shape of the slot 53 of the throttle plate may be formed in a tapered shape in which the inflow cross-sectional area is reduced toward the inner flow path of the bucket from the outside.

This shape is to consider the continuous law for the fluid, the inlet cross-sectional area is gradually reduced along the flow direction of the cooling fluid, thereby increasing the relative speed.

This can introduce the cooling fluid at a higher speed toward the inner flow path of the bucket, which can lead to the effect of increased circulation. The faster the circulation speed of the cooling fluid, the faster heat transfer will increase the cooling effect.

At this time, at least some of the slots 53 of the adjustment member 50 may be formed in another inflow cross-sectional area.

Referring to FIG. 6, some slots 53a may have different inflow cross-sections than other slots 53b. This increases the inflow of the cooling fluid by arranging a slot 53b having a relatively large inflow cross-sectional area at the center of the adjusting member 50, and arranging a slot 53a having a relatively small inflow cross-sectional area at both sides to flow the cooling fluid. As focused on the center side, it can be changed according to user purpose.

10 is a bottom view of the slot shape of the throttle plate according to the present invention, and FIG. 11 is a bottom view showing the cutout 59 of the throttle plate according to the present invention.

First, referring to FIG. 10, the slots 54 of the adjusting member 50 may have the same size along the length direction.

In another embodiment, as shown in FIG. 11, a cutout portion 59 is formed at a portion of both ends of the adjusting member 50, and a slot 55b disposed inside the cutout portion 59 is a cutout portion 59. It may be configured to have a relatively small inlet cross-sectional area than the slot (55a) disposed outside of. The configuration of the cutout 59 is to consider the effect of reducing the weight of the adjustment member (50).

At this time, the cooling fluid is introduced into the internal flow path of the bucket through the space between the slot (55a, 55b) and the cutout 59 of the adjustment member 50 after passing through the inlet hole (25).

On the other hand, Figure 7 is a partial side cross-sectional view showing another form of the laminated structure of the throttle plate and the slot shape of the present invention.

Referring to FIG. 7, the adjustment member 50 may be formed of a plurality of control plates stacked, and the plurality of control plates may include different slot shapes. The throttle plate may include a first plate 60, a second plate 70 and a third plate 80.

The first plate 60 is disposed in the coupling hole 27 in the direction of the inflow hole 25, and the first plate 60 is narrowed in the inflow path C of the bucket in the inflow hole 25. It may include a slot 62 formed with a taper angle θ1.

In addition, the second plate 70 is disposed on the inner flow path direction side of the bucket inside the coupling part 27, and the second plate 70 is narrowed in the inner flow path C direction of the bucket at the first plate 60. It may include a slot 72 formed at the taper angle θ2. In this case, the second taper angle θ2 may be greater than the first taper angle θ1.

The third plate 80 is disposed between the second plate 70 and the internal flow path of the bucket in the coupling portion 27, and the internal flow path C of the bucket in the second plate 70. The slot 82 may be formed to have a third taper angle θ3 narrowing in a direction, and the third taper angle θ3 may be larger than the second taper angle θ2.

That is, the adjustment member 50 may be provided in the form of a laminated junction of three plates, the slot formed in each plate may be processed at different taper angles. In such a structure, as the cooling fluid passes through the slots of the plates, the inflow cross-sectional area is gradually reduced and accelerated.

And, Figure 8 is a partial side cross-sectional view showing another form of the laminated structure and slot shape of the throttle plate in the present invention.

Referring to FIG. 8, the adjusting member 50 may be formed of a plurality of adjusting plates stacked, and the plurality of adjusting plates may include different slot shapes. The throttle plate may include a first plate 60, a second plate 70 and a third plate 80.

The first plate 60 may include a slot 62 disposed inside the coupling part 27 in the inflow hole 25 direction and inclined toward the inflow direction of the cooling fluid. The cooling fluid introduced into the inflow hole 25 by the inclined slot 62 structure may flow in the flow direction more smoothly and flow into the second plate 70.

And the second plate 70 is disposed in the inner flow path direction side of the bucket in the coupling portion 27, the fourth plate is narrowed in the direction of the inner flow path (C) of the bucket from the first plate (60) It may include a slot 72 formed with a taper angle θ4. In this case, the slot 72 of the second plate 70 may be divided into a plurality of inlet cross-sectional areas within the inlet cross-sectional area of the slot of the first plate 60.

Such a split arrangement prevents a decrease in flow velocity at the slot center side, which may occur in a wide slot. That is, as the cooling fluid is dispersed and flows through the split slot 72, the overall speed increase can be expected according to the law of fluid continuity.

In addition, the third plate is disposed between the second plate 70 and the inner passage of the bucket in the coupling portion 27, the second plate 70 in the direction of the inner passage (C) of the bucket It may include a slot 82 formed with an extended fifth taper angle θ5.

In this case, the fifth taper angle θ5 may be configured such that the inflow cross-sectional area is extended toward the inner flow path of the bucket from the second plate 70. Expanding formation can improve the dispersion of the bucket's internal flow path. This may be appropriately changed and selected depending on the shape of the internal flow path of the bucket.

Next, Figure 9 is a partial side cross-sectional view showing another form of the laminated structure of the throttle plate and the slot shape of the present invention.

Referring to Figure 9, the adjustment member 50 is made of a plurality of control plates are stacked, the plurality of control plates may be configured to include a different slot shape. Such a throttle plate may be configured to include a first plate 60 and a second plate 70.

First, the first plate 60 may include a slot 62 disposed inside the coupling part 27 in the direction of the inflow hole 25 and rounded with a predetermined curvature Φ. The cooling fluid introduced into the inflow hole 25 according to the rounded shape may flow smoothly along the curved portion and flow in the direction of the second plate 70.

The second plate 70 is disposed on the inner flow path direction side of the bucket in the coupling portion 27, and the sixth taper narrowed in the direction of the inner flow path C of the bucket in the first plate 60. It may include a slot 72 formed at an angle θ6. In such a structure, as the cooling fluid passes through the slot 72, the inflow cross-sectional area is gradually reduced and the acceleration effect can be obtained.

On the other hand, the inventors of the present invention is a bucket including the throttle plate coupling structure 10 of the bucket and the bucket mounting portion 32 to which the dovetail 23 of the bucket is coupled in a plurality spaced apart at predetermined intervals along the circumferential direction The rotor disc 30 may include a rotor in which the rotor disc 30 is arranged in a plurality of rows along the axial direction.

The gas turbine of the present invention is disposed on the casing and the front side into which the working fluid flows from the casing, and is arranged on the intermediate side of the casing and the compressor section provided to compress the working fluid, and is connected to the compressor section, and the compression is performed. A rear end of the casing and a combustor which is provided to combust the mixed working fluid with fuel, the turbine section being connected to the combustor and arranged at the rear end of the casing and the turbine section provided to generate power from the combustion gas, It is connected to the turbine section, including a diffuser provided to discharge the working fluid, the rotating body may be provided in a structure for connecting the compressor section and the turbine section by one rotation shaft.

The foregoing merely illustrates a specific embodiment of the throttle plate coupling structure of the bucket.

Therefore, it will be apparent to those skilled in the art that the present invention may be substituted and modified in various forms without departing from the spirit of the present invention as set forth in the claims below. do.

10: Bucket throttle plate coupling structure
20: bucket
21: Blade
22: Platform
23: Dovetail
25: Inflow hole
27: coupling part
30: rotor disc
32: bucket mounting
50: adjustment member
51, 52, 53a, 53b, 54, 55a, 55b
59: Incision
60: The first edition
62: slot of the first plate
70: second edition
72: slot of the second edition
80: the third edition
82: slot of the third edition

Claims (15)

Cooling fluid inlet holes are arranged in plurality in the longitudinal direction at the end of the dovetail of the bucket at a predetermined interval;
A coupling part formed to penetrate in the longitudinal direction of the dovetail of the bucket and disposed adjacent to the inflow hole; And
And a control member disposed to be inserted into the coupling part and having a plurality of slots communicating with the inflow path of the bucket and the inflow hole along the length direction.
Wherein the control member is made of a plurality of control plates are stacked, the plurality of control plate is a throttle plate coupling structure of the bucket, characterized in that it comprises a different slot shape.
delete delete delete delete delete delete The method of claim 1,
The throttle is,
A first plate disposed inside the coupling part in a direction toward the inflow hole and including a slot formed at a first taper angle narrowing in the inflow hole in the inflow hole; And
A second plate disposed on the inner flow path side of the bucket in the coupling part and including a slot formed at a second taper angle narrowing in the direction of the inner flow path of the bucket in the first plate;
To include, wherein the second tapered angle is larger than the first tapered angle of the bucket throttle plate coupling structure.
The method of claim 8,
The throttle is,
And a third plate disposed between the second plate and the inner channel of the bucket in the coupling part and including a slot formed at the second plate at a third taper angle narrowing in the direction of the inner channel of the bucket. The throttle plate coupling structure of the bucket, characterized in that the third taper angle is larger than the second taper angle.
The method of claim 1,
The throttle is,
A first plate disposed in the coupling hole in the inflow hole direction and including a slot inclined toward the inflow direction of the cooling fluid; And
A second plate disposed on the inner flow path side of the bucket in the coupling part and including a slot formed at a fourth taper angle narrowing in the direction of the inner flow path of the bucket in the first plate;
The throttle plate coupling structure of the bucket, characterized in that it comprises a.
The method of claim 10,
The slot of the second plate is a throttle plate coupling structure of the bucket, characterized in that divided into a plurality of inlet cross-sectional area within the inlet cross-sectional area of the slot of the first plate.
The method of claim 10,
And a third plate disposed between the second plate and the inner channel of the bucket in the coupling part and including a slot formed at a fifth taper angle extending from the second plate in the direction of the inner channel of the bucket. And the fifth taper angle is configured to expand the inlet cross-sectional area toward the inner flow path of the bucket in the second plate.
The method of claim 1,
The throttle is,
A first plate disposed inside the coupling part in a direction of the inflow hole and including a slot rounded with a predetermined curvature; And
A second plate disposed on the inner flow path direction side of the bucket in the coupling part and including a slot formed at the sixth taper angle narrowing in the direction of the inner flow path of the bucket in the first plate;
The throttle plate coupling structure of the bucket, characterized in that it comprises a.
A bucket comprising a throttle plate coupling structure of any one of claims 8 to 13;
A rotor disk having a plurality of bucket mounting portions to which the dovetails of the bucket are coupled at predetermined intervals along the circumferential direction;
A rotor in which the rotor discs are arranged in a plurality of rows along an axial direction;
Rotating body comprising a.
Casing;
A compressor section disposed on the front side of the casing, in which the working fluid is introduced, and provided to compress the working fluid;
A combustor disposed at an intermediate side of the casing and connected to the compressor section, the combustor being provided to combust the compressed working fluid with fuel;
A turbine section disposed at a rear side of the casing and connected to the combustor, the turbine section being provided to produce power from combustion gas; And
And a diffuser disposed at a rear end of the casing and connected to the turbine section and provided to discharge the working fluid.
The gas turbine of claim 14, wherein the rotating body connects the compressor section and the turbine section to one rotation shaft.

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