JP2013164009A - Disc shaft center adjusting mechanism in gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be able to monitor the shaft center of a rotor continuously and suppress deviation of the shaft center of the rotor by adjusting a rate of flow of air to cool struts.SOLUTION: A disc shaft center adjusting mechanism in a gas turbine includes: an exhaust diffuser 13 having an outer diffuser and an inner diffuser; a plurality of struts 14 provided at certain intervals in the circumferential direction in such a manner as to penetrate the exhaust diffuser 13 for coupling a cabin wall 10 with a bearing case 11; and a strut cover 15 to couple together the outer and inner diffusers in such a manner as to cover the struts 14. Here, the cabin wall 10: has a plurality of air introducing holes 17 which are arranged corresponding to the respective struts 14 in order to cause communications between the inside and outside; and is provided with a temperature sensor 25 detecting a parameter corresponding to the thermal extension of the struts 14, and a flow regulating valve 20 regulating a rate of air flow flowing through the air introducing holes 17 on the basis of the detected value of the temperature sensor 25.

Description

  The present invention relates to a disk shaft center adjusting mechanism provided in a gas turbine exhaust part of a gas turbine.

  Conventionally, in a turbine portion of a gas turbine, in order to recover the static pressure of combustion gas from the turbine, a double pipe structure exhaust diffuser connected to the combustion gas outlet of the turbine includes this exhaust diffuser. In general, the exhaust portion of the gas turbine is also subject to cooling.

  In general, the gas turbine exhaust section includes an exhaust diffuser composed of an outer diffuser and an inner diffuser, a casing wall provided to cover the exhaust diffuser and an exhaust cavity composed of a bearing case, and a casing wall penetrating the exhaust diffuser. And a strut cover for connecting the outer diffuser and the inner diffuser so as to cover the strut.

In such a gas turbine, for example, Patent Document 1 discloses a cooling structure that promotes replacement of air in a strut portion and an exhaust tunnel by a cooling system to enhance a cooling effect of the gas turbine exhaust portion.
In Patent Document 1, an air intake port that passes through the exhaust diffuser downstream of the exhaust cavity and communicates with the exhaust tunnel communicating with the exhaust cavity and the outside of the passenger compartment is provided inside the exhaust diffuser. A structure including a cooling system that discharges the taken-in air out of the exhaust cavity through a pipe as a suction exhaust means through a space between the strut and the strut cover is described.

Japanese Patent No. 4681458

However, in the cooling structure provided in the conventional gas turbine exhaust section shown in Patent Document 1, the amount of air supplied between the strut and the strut cover is not controlled, and therefore the air supply amount may vary. was there. In that case, a temperature difference occurs between the struts, which causes a thermal elongation deviation in the length direction (direction approaching and moving away from the rotor) of each strut, which may cause the rotor axis to shift. It was. Further, since the deviation of the axial center causes a deviation in the clearance between the rotor blade supported by the rotor and the casing wall, rubbing or the like may occur.
Even if the struts are insufficient in rigidity, the shaft center may be shifted due to the weight of the rotor, and continuous monitoring is required. Therefore, there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and by adjusting the flow rate of air for cooling the struts, the deviation of the rotor axis can be suppressed, and the rotor axis can be continuously adjusted. An object of the present invention is to provide a disk axis adjusting mechanism in a gas turbine that can be monitored.

  In order to achieve the above object, in the disk shaft center adjusting mechanism for a gas turbine according to the present invention, an outer diffuser and an inner diffuser provided between a casing wall and a bearing case respectively connected to the downstream side of the turbine. The exhaust diffuser, the vehicle interior wall and the bearing case are connected through the exhaust diffuser, and a plurality of struts spaced apart in the circumferential direction are connected, and the outer diffuser and the inner diffuser are connected so as to cover the struts A disc shaft center adjusting mechanism in a gas turbine having a strut cover, wherein the casing wall is provided so as to correspond to each strut, and has a plurality of air introduction holes communicating inside and outside, Based on the sensor unit that detects the parameter corresponding to the thermal expansion of the strut and the detected value in the sensor unit It is characterized by comprising a flow rate adjusting unit for adjusting the flow rate of air flowing through the air inlet holes, a.

In the present invention, the temperature of the strut can be lowered by allowing the air outside the compartment wall to flow between the strut and the strut cover through a plurality of air introduction holes provided in the compartment wall. And the parameter corresponding to the thermal expansion of a strut is detected by a sensor part, and the flow volume of the air which distribute | circulates an air introduction hole can be changed by adjusting a flow volume adjustment part based on this detected value. For example, based on the amount of thermal expansion of each strut, calculate the thermal expansion deviation of those struts, identify struts with a large amount of thermal elongation, and circulate air at an appropriate flow rate for that specific strut It is possible to cool it.
In this way, the amount of thermal expansion of the struts can be monitored and the amount of thermal expansion of a plurality of struts can be adjusted by cooling, so that the deviation of the axial center of the rotor supported by the struts via the bearing case can be suppressed. Thus, the deviation of the clearance between each rotor blade supported by the rotor and the casing wall can be suppressed.

  Further, according to the disk axis adjustment mechanism of the present invention, the sensor unit can monitor the parameter corresponding to the thermal expansion of the strut in real time, so the flow rate of air flowing through the air introduction hole based on the above-described calculation It is possible to continue the operation flow for adjusting the. Therefore, by continuing the operation flow, it is possible to average the thermal elongation amounts of the plurality of struts and to continuously stabilize the operation of the turbine.

  Moreover, in the disk axis adjusting mechanism in the gas turbine according to the present invention, the sensor unit is preferably a temperature sensor that detects the temperature of the strut.

  In this case, the flow rate of the air flowing through the air introduction hole can be changed by detecting the strut temperature with a temperature sensor, calculating the amount of thermal elongation from the detected temperature, and adjusting the flow rate adjusting unit. .

  In the disk axis adjusting mechanism in the gas turbine according to the present invention, the temperature sensor is a thermocouple, and a plurality of temperature sensors are preferably provided along the length direction of the strut.

  In this case, since the temperature at a plurality of locations in the length direction of the strut can be detected, the temperature variation in the length direction of the strut is reduced and averaged. Therefore, the accuracy of the detected value can be increased, and the accuracy of correcting the deviation of the rotor shaft center can be improved.

  Further, in the disk shaft center adjusting mechanism in the gas turbine according to the present invention, the sensor unit is provided outside the vehicle compartment wall, and the laser beam is allowed to pass through the region inside the strut cover where the strut is interposed. A laser displacement meter that measures the amount of displacement up to the outer periphery may be used.

  In this case, the laser beam passes to the position close to the strut in the space between the strut and the strut cover, and the displacement amount to the portion close to the position where the strut of the bearing case is fixed is measured with the laser displacement meter. Can do. In other words, this displacement amount is equivalent to the length of the strut in the length direction. Therefore, by calculating the amount of thermal expansion of the strut from this displacement amount and adjusting the flow rate adjustment unit, the amount of air flowing through the air introduction hole is calculated. The flow rate can be changed.

  Further, in the disk shaft center adjusting mechanism in the gas turbine according to the present invention, a partition plate that divides the space between the strut cover and the inner peripheral surface of the passenger compartment wall in the circumferential direction is provided, and one strut serves as the partition plate. It is preferable that they are arranged in a region partitioned by.

  In the present invention, an area partitioned by a partition plate corresponding to each strut is formed, and an air introduction hole can be individually provided in each strut by disposing an air introduction hole in the compartment wall in the area. it can. In this case, the flow rate of the air flowing through the space between the strut and the strut cover can be stabilized, and the correction accuracy of the thermal expansion amount of the strut based on the detection value of the sensor unit can be increased. Moreover, since the flow rate adjustment part corresponding to every strut can be adjusted, it is also possible to cool several struts simultaneously, and there exists an advantage that it can respond to the thermal expansion of the whole strut.

  Further, in the disk axis adjusting mechanism in the gas turbine according to the present invention, the casing wall is provided with a displacement sensor for measuring the displacement of the casing wall, and based on the displacement of the casing wall detected by the displacement sensor, It is more preferable to blow air on the outer peripheral surface of the passenger compartment wall.

  In the present invention, air is blown to the outer peripheral surface of the vehicle compartment wall based on the displacement of the vehicle compartment wall detected by the displacement sensor separately from the sensor unit that detects the parameter corresponding to the thermal expansion of the strut described above. The displacement of the casing wall can be corrected. Then, the flow rate adjusting unit is adjusted in accordance with the thermal expansion of the struts detected by the sensor unit for the displacement of the casing wall, and the deviation in the rotor shaft center is adjusted in consideration of the clearance between the casing wall and the moving blade. It can be carried out.

  According to the disk shaft center adjustment mechanism in the gas turbine of the present invention, the parameter corresponding to the thermal expansion of the strut is detected by the sensor unit, and the flow rate adjustment unit is adjusted based on the detected value, thereby circulating the air introduction hole. The flow rate of the air to be changed can be changed, whereby the deviation of the rotor shaft center can be suppressed. In addition, there is an effect that the axial center of the rotor can be continuously monitored.

It is a half sectional view showing the composition of the gas turbine by a 1st embodiment of the present invention. It is the sectional view on the AA line shown in FIG. It is an enlarged view of the cooling flow path shown in FIG. (A), (b) is sectional drawing of a flow regulating valve. (A), (b) is a top view of the exchange flange of a flow regulating valve. It is a top view for demonstrating the opening-and-closing state of a flow regulating valve. It is a flowchart which shows the cooling operation of 1st Embodiment. It is a flowchart which shows the cooling operation by the modification of 1st Embodiment. It is the side view which showed typically the disk axial center adjustment mechanism of 2nd Embodiment. It is sectional drawing of the disk axial center adjustment mechanism by 2nd Embodiment. It is a flowchart which shows the cooling operation of 2nd Embodiment. It is sectional drawing which showed typically the disc axial center adjustment mechanism of 3rd Embodiment. It is a flowchart which shows the cooling operation of 3rd Embodiment.

  Hereinafter, a disk shaft center adjusting mechanism in a gas turbine according to an embodiment of the present invention will be described with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention.

(First embodiment)
As shown in FIG. 1, the disk axis adjusting mechanism of the first embodiment controls the cooling mechanism provided in the gas turbine exhaust section 2 including the exhaust diffuser in the gas turbine 1. The axis is adjusted.
The gas turbine 1 compresses the air taken in the air supply equipment 3 to obtain compressed air for combustion, and burns the compressed air from the compressor 4 together with fuel to generate high-temperature and high-pressure combustion gas. And a turbine 7 that obtains rotational power of the rotor 6 (6A, 6B) by the combustion gas from the combustor 5.
The turbine 7 may be one or two shafts, but in the present embodiment, a single shaft type will be described below as an example.

  The rotor 6 </ b> A of the turbine 7 is connected to the rotor 6 </ b> B of the compressor 4 via the intermediate shaft 8, converts the fluid energy of the combustion gas from the combustor 5 into rotational energy, and converts this rotational energy into the compressor 4. The power is transmitted to the rotor 6B to drive the compressor 4, and a generator (not shown) connected to the rotor 6B of the compressor 4 is caused to generate power. The combustion gas (exhaust gas) discharged from the turbine 7 passes through the gas turbine exhaust section 2 and the exhaust duct 9 and is released to the atmosphere via a chimney (not shown).

  As shown in FIG. 2, the gas turbine exhaust section 2 includes an exhaust cavity 12 defined by a cylindrical casing wall 10 and a bearing case 11 respectively connected to the downstream side of the turbine 7, and a casing wall 10. An exhaust diffuser 13 comprising an outer diffuser 13a and an inner diffuser 13b provided between the turbine 7 and the bearing case 11 and connected to the combustion gas outlet of the turbine 7 to recover the static pressure of the combustion gas from the turbine 7; A strut 14 that passes through the diffuser 13 and connects the vehicle compartment wall 10 and the bearing case 11 and a strut cover 15 that connects the outer diffuser 13a and the inner diffuser 13b so as to cover the strut 14 are provided.

  The vehicle interior wall 10 is divided into a plurality of parts in the axial direction corresponding to a plurality of stages of turbine stationary blades, struts 14 and the like. Six struts 14 are provided at equal intervals in the circumferential direction and in the tangential direction of the bearing case 11. The number of struts 14 is not limited to this.

  In the present embodiment, an air introduction that communicates the inside and outside (the exhaust tunnel 16 and the outside of the passenger compartment (substantially atmospheric pressure in an enclosure not shown)) is provided at a position near the connecting portion of each strut 14 in the passenger compartment wall 10. A hole 17 is provided. That is, the air introduced from the air introduction hole 17 flows through the space between the strut 14 and the strut cover 15 (hereinafter referred to as the cooling flow path R) and is sent into the exhaust cavity 12. Here, the position of the air introduction hole 17 on the passenger compartment wall 10 is a position close to the counterclockwise direction across the strut 14 in the circumferential direction toward the paper surface of FIG.

  The air introduced from the air introduction hole 17 is cooled between the strut 14 and the strut cover 15 due to a differential pressure between the air introduction hole 17 under substantially atmospheric pressure and the bell mouth portion of the intake equipment 3 under negative pressure. The inside of the flow path R is sucked from the air introduction hole 17 to the bell mouth portion of the intake equipment 3.

  In the present embodiment, partition plates 18 that are partitioned in the circumferential direction are provided at six locations between the strut cover 15 and the inner peripheral surface of the cabin wall 10 so as to correspond to the struts 14. Yes. The partition plate 18 is disposed between the strut 14 and the air introduction hole 17 adjacent thereto on the counterclockwise side with the strut 14 sandwiched in the circumferential direction toward the paper surface in FIG. Thereby, as shown in FIG. 3, the air supplied from the air introduction hole 17 at a predetermined position is a predetermined flow path partitioned by the partition plate 18, that is, a space between the strut cover 15 and the vehicle compartment wall 10. S and the cooling flow path R between the strut 14 and the strut cover 15 pass through and flow into the exhaust cavity 12.

  The air introduction hole 17 is provided with a flow rate adjusting valve 20 at a position outside the vehicle compartment wall 10. As shown in FIG. 4 (a), the flow rate adjusting valve 20 overlaps the fixed flange 21 with the flange 21 b having an opening hole 21 a having the same diameter as the air introduction hole 17 and the fixed flange 21. An exchange flange 22 having an opening hole 22a detachably provided by a bolt or the like, and an opening / closing plate 23 capable of adjusting the opening hole 22a of the exchange flange 22 to an appropriate opening degree are provided (see FIG. 6).

  The replacement flange 22 is provided with a mesh material 22b on the opening surface of the opening hole 22a, and can be attached to the fixing flange 21 by appropriately attaching and detaching one having a different hole diameter. That is, the opening hole 22a of the replacement flange 22 has the same diameter as the opening hole 21a of the fixed flange 21 as shown in FIGS. 4 (a) and 5 (a), and FIG. 4 (b) and FIG. It may be smaller than the opening hole 21a of the fixing flange 21 as shown in FIG. Since the replacement flange 22 is provided outside the passenger compartment wall 10, it can be replaced with an appropriate hole diameter even during operation of the gas turbine 1.

  As shown in FIG. 6, the opening / closing plate 23 is slidably provided along the opening surface of the replacement flange 22, and the operation unit 23 a is stepwise based on an instruction value obtained by a flow rate adjustment control unit 26 described later. By switching, the opening area of the opening hole 22a of the replacement flange 22 can be adjusted.

  As shown in FIG. 2, the above-described flow rate adjusting means is provided in each strut 14, and a temperature sensor 25 (sensor unit) such as a thermocouple that detects the temperature of the strut 14, which is a parameter corresponding to the thermal expansion of the strut 14. And a flow rate adjustment control unit 26 that adjusts the flow rate of the air flowing through the air introduction hole 17 based on the detected value (temperature) of the temperature sensor 25.

  A plurality of (four) temperature sensors 25 are provided at equal intervals along the length direction of the strut 14 (the extending direction of the casing wall 10 and the bearing case 11 in the strut 14). The number of temperature sensors 25 per strut 14 can be set as appropriate. In the present embodiment, four temperature sensors 25 are provided for each strut 14, but the present invention is not limited to this. It is sufficient that at least one temperature sensor 25 is provided for each of the above.

  The flow rate adjustment control unit 26 shown in FIG. 2 calculates the amount of thermal expansion of each strut 14 based on the measured value by each temperature sensor 25, and opens and closes the plurality of flow rate adjustment valves 20.

Here, a method of adjusting the introduction amount of air supplied from the air introduction hole 17 by the flow rate adjusting means described above will be described based on the drawings.
As shown in FIGS. 2 and 7, in step S <b> 1, the metal temperature of the strut 14 is measured by the temperature sensor 25 provided in each strut 14. Then, the flow rate adjustment control unit 26 calculates the average amount of thermal expansion of each strut 14 based on the detected temperature (step S2). That is, the amount of thermal elongation is calculated from the average value of the temperatures detected by the four temperature sensors 25 provided in the length direction of the struts 14.
Here, the thermal elongation of the strut 14 causes a displacement in the bearing case 11 supported by the strut 14, and a deviation occurs in the axis of the rotor 6.

  Next, in step S3, the thermal elongation deviations of a plurality of (six) struts 14 are calculated, and the struts 14 having a large thermal elongation amount are specified among the struts 14 (step S4). In this embodiment, the amount of air necessary for the specified strut 14 is calculated from the thermal elongation amount of the strut 14 specified in step S4, and the flow rate adjustment valve 20 corresponding to the specified strut 14 is manually set. The flow rate is adjusted (step S5).

  As a result, the air whose flow rate has been adjusted by the flow rate adjusting valve 20 circulates in the cooling flow path R (the space between the strut 14 and the strut cover 15) corresponding to the specified strut 14. The strut 14 is cooled and the amount of thermal elongation is reduced. Therefore, the displacement of the bearing case 11 can be reduced, and the deviation of the axis of the rotor 6 can be corrected.

  Here, the measurement by the temperature sensor 25 in step S1 is performed in real time, and the thermal elongation amount of the strut 14 is calculated even in the state after the flow rate adjustment by the flow rate adjustment valve 20. Therefore, the operation flow of steps S1 to S5 described above is in a circulating state, and the axis of the rotor 6 is constantly monitored.

Next, the operation of the disk axis adjusting mechanism in the gas turbine will be described more specifically based on the drawings.
As shown in FIG. 3, in the disc axis adjusting mechanism of the present embodiment, the strut 14 and the strut cover 15 are supplied from the air introduction holes 17 provided in the compartment wall 10 to the air outside the compartment wall 10. The temperature of the strut 14 can be lowered by circulating between the two. Then, a parameter corresponding to the thermal expansion of the strut 14 is detected by the temperature sensor 25, and the flow rate adjusting valve 20 is adjusted as shown in FIG. 7 based on the detected value, so that the air flowing through the air introduction hole 17 can be adjusted. The flow rate can be changed.
Thus, the amount of thermal expansion of the struts 14 can be monitored and the amount of thermal expansion of the plurality of struts 14 can be adjusted by cooling, so that the axis of the rotor 6 supported by the struts 14 via the bearing case 11 can be adjusted. The deviation can be suppressed, and thereby the deviation of the clearance between each rotor blade supported by the rotor 6 and the casing wall 10 can also be suppressed.

  Moreover, since the parameter corresponding to the thermal expansion of the strut 14 can be monitored in real time by the temperature sensor 25, the operation flow for adjusting the flow rate of the air flowing through the air introduction hole 17 based on the above-described calculation is continued. Is possible. Therefore, by continuing the operation flow, it is possible to average the thermal elongation amounts of the plurality of struts 14 and to continuously stabilize the operation of the gas turbine 1.

  Furthermore, since the temperature sensor 25 is a thermocouple and is provided in plural along the length direction of the strut 14, it is possible to detect temperatures at a plurality of locations in the length direction of the strut 14. The variation in temperature in the length direction is reduced and averaged. Therefore, the accuracy of the detected value can be increased, and the accuracy of correcting the deviation of the axis of the rotor 6 can be improved.

  Furthermore, in the disc axis adjusting mechanism of the present embodiment, an area defined by the partition plate 18 corresponding to each strut 14 is formed, and the air introduction hole 17 is disposed in the vehicle compartment wall 10 in the area. Thus, the air introduction holes 17 corresponding to the struts 14 can be provided individually. In this case, the flow rate of the air flowing through the cooling flow path R between the strut 14 and the strut cover 15 can be stabilized, and the correction accuracy of the thermal expansion amount of the strut 14 based on the detection value of the temperature sensor 25 can be improved. Can do. Moreover, since the flow regulating valve 20 corresponding to each strut 14 can be adjusted, it is possible to cool a plurality of struts 14 at the same time, and there is an advantage that it is possible to cope with the thermal expansion of the entire struts.

  In the present embodiment, since the opening / closing operation of the flow rate adjusting valve 20 is performed manually by the opening / closing plate 23, a complicated function such as automatic adjustment is unnecessary, and the operator adjusts the flow rate during operation. The deviation of the axis of the rotor 6 can be adjusted. That is, the cost can be reduced because it does not rely on a complicated adjustment mechanism.

In the disk shaft center adjustment mechanism in the gas turbine according to the first embodiment described above, the temperature sensor 25 detects a parameter corresponding to the thermal expansion of the strut 14 and adjusts the flow rate adjustment valve 20 based on this detected value. Thus, the flow rate of the air flowing through the air introduction hole 17 can be changed, and thereby the deviation of the axis of the rotor 6 can be suppressed.
In addition, the axial center of the rotor 6 can be continuously monitored.

  Next, other embodiments and modifications of the disk axis adjusting mechanism in the gas turbine of the present invention will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the first embodiment described above. The same reference numerals are used to omit the description, and a configuration different from that of the first embodiment will be described.

(Modification)
In the first embodiment described above, the opening / closing plate 23 (see FIG. 6) of the flow rate adjustment valve 20 is manually opened and closed, but in this modification, based on the command of the flow rate adjustment control unit 26 shown in FIG. Thus, the opening / closing operation of the opening / closing plate 23 of the flow rate adjusting valve 20 is automatically controlled.
That is, as shown in FIG. 8, the opening / closing amount (opening degree) of the opening / closing plate 23 corresponding to the specified strut 14 based on the thermal elongation amount of the strut 14 specified in step S4 and the deviation values of the plurality of struts 14. ), That is, the air flow rate is calculated (step SS4A). In step S5, the predetermined flow rate adjustment valve 20 is adjusted based on the opening / closing amount obtained in step S4A.

(Second Embodiment)
Next, as shown in FIGS. 9 and 10, in the disk shaft center adjusting mechanism in the gas turbine according to the second embodiment, the temperature sensors 25 (see FIG. 10) provided in each strut 14 in the first embodiment described above. In addition to 3), a laser displacement meter 27 is provided as a sensor unit. The laser displacement meter 27 is for detecting a parameter corresponding to the thermal expansion of the strut 14 as with the temperature sensor 25 described above. The laser displacement meter 27 is provided outside the vehicle compartment wall 10 and has a strut cover 15 with the strut 14 interposed therebetween. The laser beam L is allowed to pass through the inner region, and the amount of displacement up to a predetermined portion of the outer peripheral portion 11a of the bearing case 11 is measured.

  The laser displacement meter 27 is provided with a transmission portion 28 made of glass or the like on the casing wall 10 positioned on the extension line of the space between the strut 14 and the strut cover 15 (cooling flow path R). The laser beam L that emits and receives light is arranged on the outer peripheral side of the part 28 so as to pass through the transmission part 28. The laser beam L is irradiated along the substantially length direction of the strut 14 at a position close to the strut 14 in the strut cover 15.

  In the flow rate adjustment control unit 26 shown in FIG. 2, since the distance between the vehicle compartment wall 10 and the bearing case 11 is determined as shown in FIG. 11, it is measured by the laser displacement meter 27 in step S6. In step S7, the displacement amount is converted as the thermal elongation amount of the strut 14, and the thermal elongation deviation of each of the plurality of struts 14 is calculated.

  Steps S6 and S7 are parallel to steps S1 to S3 (described above) in the temperature sensor 25, and the respective flows F1 and F2 (the first calculation flow F1 by the temperature sensor 25 and the second calculation flow by the laser displacement meter 27). Based on F2), in step S8, the strut 14 having a large thermal elongation amount is identified from the struts 14. Then, the air flow rate is calculated (step S9), and the predetermined flow rate adjustment valve 20 is adjusted based on the flow rate obtained in step S9 in step S10.

  In the second embodiment, as shown in FIG. 11, the laser beam L passes through the space between the strut 14 and the strut cover 15 at a position close to the strut 14, and the strut 14 of the bearing case 11 is fixed. The amount of displacement up to the portion close to the position to be measured can be measured by the laser displacement meter 27. That is, since this displacement amount is equivalent to the dimension of the strut 14 in the longitudinal direction, the amount of thermal expansion of the strut 14 is calculated from this displacement amount, and the flow rate adjusting valve 20 is adjusted, so that the air introduction hole 17 is made. The flow rate of the circulating air can be changed.

(Third embodiment)
As shown in FIG. 12, in the disc shaft center adjusting mechanism in the gas turbine according to the third embodiment, the displacement of the casing wall 10 is brought into contact with the positions of the upper end 10a and the lower end 10b outside the casing wall 10 by contact. A displacement sensor 30 to be measured is provided, and air is blown onto the outer peripheral surface of the vehicle compartment wall 10 based on the displacement of the vehicle compartment wall 10 detected by the displacement sensor 30.

  Specifically, a measurement projection 31 is provided at a measurement location (here, upper end 10 a and lower end 10 b) on the outer peripheral surface of the compartment wall 10, and the detection portion 30 a of the displacement sensor 30 is brought into contact with the measurement projection 31. . And the upper half part of the outer peripheral surface of the compartment wall 10 is coat | covered with the heat insulating material 32, and the air introducing port 33 is penetrated through the heat insulating material 32 from the outer side. The air inlet 33 is connected to, for example, a small compressed air device 34 (compressor). As a result, the air blown out from the air inlet 33 is directly blown to the outer peripheral surface of the upper half portion of the passenger compartment wall 10 for cooling, and the air is also supplied to the inside of the heat insulating material 32. The temperature of the half portion can be reduced, and the eccentricity of the compartment wall 10 itself can be suppressed. Thereby, the clearance deviation with each moving blade (rotor 6) in the compartment wall 10 can be made small.

FIG. 13 shows an operation flow according to the third embodiment, which is based on the operation flow according to the second embodiment described above.
As shown in FIG. 13, the cooling flow F3 for reducing the displacement of the passenger compartment wall 10 detected by the displacement sensor 30 is an operation flow different from the flow rate adjustment flow F0 based on the temperature sensor 25 and the laser displacement meter 27. It has become.
If the passenger compartment wall 10 to which the struts 14 are attached is elliptically deformed, there is a possibility that the error may cause an error in the rotor 6. That is, the clearance can also be corrected by adjusting the flow rate by the flow rate adjusting valve 20, so that the displacement detected by the displacement sensor 30 is also an adjustment condition for the flow rate adjusting valve 20.

Specifically, in the flow rate adjustment flow F0 in FIG. 13, the parameter (step S7) corresponding to the thermal expansion of the strut 14 detected by the temperature sensor 25 and the laser displacement meter 27 shown in FIG. After that, the flow rate adjustment valve 20 is adjusted in step S12.
After the flow rate adjustment in step S12, the displacement sensor 30 detects the displacement of the vehicle compartment wall 10 again, the clearances before and after the flow rate adjustment are compared (step S13), and the clearance deviation is calculated (step S14). The calculated flow rate of the air is corrected, whereby the optimum condition for the clearance between the casing wall 10 and each rotor blade (rotor 6) is calculated.

In the third embodiment, apart from the temperature sensor 25 and the laser displacement meter 27 that detect the parameters corresponding to the thermal expansion of the struts 14 described above, the displacement of the vehicle compartment wall 10 detected by the displacement sensor 30 is used. The displacement of the casing wall 10 can be corrected by blowing air onto the outer peripheral surface of the casing wall 10.
Then, the flow rate adjusting valve 20 is adjusted in accordance with the detected displacement of the casing wall 10 corresponding to the thermal expansion of the strut 14 detected by the sensor unit such as the temperature sensor 25, and the clearance between the casing wall 10 and the moving blades is adjusted. Thus, the deviation of the axis of the rotor 6 can be adjusted.

  As mentioned above, although embodiment of the disk shaft center adjustment mechanism in the gas turbine by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably. .

DESCRIPTION OF SYMBOLS 1 Gas turbine 2 Gas turbine exhaust part 6 Rotor 6A Turbine rotor 6B Compressor rotor 7 Turbine 9 Exhaust duct 10 Cabin wall 11 Bearing case 12 Exhaust cavity 13 Exhaust diffuser 14 Strut 15 Strut cover 17 Air introduction hole 18 Partition plate 20 Flow rate adjustment valve (flow rate adjustment part)
21 Fixing flange 22 Replacement flange 23 Opening and closing plate 25 Temperature sensor (sensor part)
26 Flow adjustment control unit 27 Laser displacement meter (sensor unit)
28 Transmission part 30 Displacement sensor R Cooling flow path

Claims (6)

An exhaust diffuser having an outer diffuser and an inner diffuser provided between a casing wall and a bearing case respectively connected to the downstream side of the turbine;
A plurality of struts provided through the exhaust diffuser to connect the casing wall and the bearing case, with a circumferential interval;
A strut cover connecting the outer diffuser and the inner diffuser so as to cover the strut;
A disk axis adjusting mechanism in a gas turbine comprising:
The casing wall is provided so as to correspond to each of the struts, and has a plurality of air introduction holes communicating between the inside and the outside,
A sensor unit for detecting a parameter corresponding to the thermal elongation of the strut;
A flow rate adjusting unit that adjusts a flow rate of air flowing through the air introduction hole based on a detection value in the sensor unit;
A disk axis adjusting mechanism in a gas turbine, comprising:   The disk shaft center adjustment mechanism in the gas turbine according to claim 1, wherein the sensor unit is a temperature sensor that detects a temperature of the strut. The temperature sensor is a thermocouple;
The disk shaft center adjustment mechanism in the gas turbine according to claim 2, wherein a plurality of the shafts are provided along a length direction of the strut.   The sensor unit is provided on the outside of the vehicle compartment wall, and allows laser light to pass through a region inside the strut cover where the struts are interposed, and measures the amount of displacement up to the outer periphery of the bearing case. The disk shaft center adjustment mechanism in a gas turbine according to any one of claims 1 to 3, wherein the disk shaft center adjustment mechanism is a meter. A partition plate is provided for partitioning a space between the strut cover and the inner peripheral surface of the casing wall in a circumferential direction;
5. The disk shaft center adjustment mechanism in a gas turbine according to claim 1, wherein one of the struts is disposed in a region defined by the partition plate. 6. The vehicle compartment wall is provided with a displacement sensor for measuring the displacement of the vehicle compartment wall,
The disk in a gas turbine according to any one of claims 1 to 5, wherein air is blown onto an outer peripheral surface of the casing wall based on the displacement of the casing wall detected by the displacement sensor. Axis center adjustment mechanism.