JP6745235B2 - Rotor and rotating machine equipped with this rotor - Google Patents

Description

The present invention relates to a rotor and a rotary machine including the rotor.

A steam turbine, which is a type of rotating machine, includes a rotor that rotates about an axis and a casing that covers the rotor. The rotor has a rotor shaft extending in the axial direction around the axis and a plurality of moving blade rows attached to the rotor shaft. The moving blade row is composed of a plurality of moving blades arranged in the circumferential direction with respect to the axis. The rotor blade is composed of a blade body extending in the radial direction with respect to the axis, a platform provided inside the blade body in the radial direction, a blade root provided inside the platform in the radial direction, and a radial outside of the blade body. An outer shroud is provided. Steam flows between the radially outer side of the platform and the radially inner side of the outer shroud.

Generally, a plurality of moving blades forming one moving blade row in a steam turbine are formed in substantially the same shape. However, when the moving blades are formed in the same shape, resonance (rotation synchronous vibration) occurs at a specific frequency during operation of the steam turbine. Such resonance is structurally generated due to the natural frequency of the moving blade.

In order to prevent the occurrence of such resonance, Patent Document 1 discloses that the moving blades are formed in different shapes. For example, the shroud of each blade is formed in a different shape. By changing the natural frequency of each rotor blade with such a configuration, it was possible to prevent the resonance of the steam turbine from occurring.

US Patent Application Publication No. 2014/0072432

However, the conventional technique has a problem that it is possible to suppress rotation-synchronous vibration (for example, resonance), but cannot suppress rotation-asynchronous vibration (for example, random vibration, self-excited vibration, forced vibration). ..

The present invention has been made to solve the above problems, and suppresses rotation synchronous vibration (for example, resonance) and rotation asynchronous vibration (for example, random vibration, self-excited vibration, forced vibration, etc.). An object of the present invention is to provide a rotor capable of suppressing the above and a rotary machine including the rotor.

In order to solve the above problems, the present invention employs the following means.
That is, the rotor according to the first aspect of the present invention includes a rotor shaft portion that is long in the axial direction about the axis line, and a plurality of blades that are fixed to the rotor shaft portion side by side in the circumferential direction with respect to the axis line. It The plurality of blades respectively include a blade body extending in a radial direction with respect to the axis, and a platform provided on the radial inside of the blade, among a radial inner side and a radial outer side with respect to the axis. An outer shroud provided on the outer side in the radial direction of the blade body, and a stub provided on the blade body in the radial direction away from the platform and the outer shroud. Each of the outer shrouds of the plurality of blades has a contact portion that is in contact with outer shrouds that are adjacent in the circumferential direction . Each of the stubs of the plurality of blades has a contact portion that contacts an adjacent stub in the circumferential direction. Heavy blades of the outer shroud and light blades of the outer shroud alternate in the circumferential direction. At least one groove is formed in each of the tip portion of the heavy blade and the tip portion of the light blade. The at least one groove is filled with a filler. The filler filled in the at least one groove of the outer shroud heavy blade has a heavier density than the filler filled in the at least one groove of the outer shroud light blade.

According to this configuration, the heavy blade at the tip portion and the light blade at the tip portion have different natural frequencies, and the heavy blade at the tip portion of the blade and the light blade at the tip portion of the blade are The contact portions are alternately arranged in the circumferential direction while contacting each other. Therefore, the deflection widths (amplitudes) of the adjacent blades are different from each other, and the amount of slip of one of the blade with the heavy tip and the blade with the light tip with respect to the other also changes in each blade. As a result, friction damping due to the contact portion between adjacent blades is increased, so that rotation synchronous vibration (for example, resonance) is suppressed and rotation asynchronous vibration (for example, random vibration, self-excited vibration, forced vibration, etc.) Can also be suppressed.

According to this configuration, since the blade with a heavy tip and the blade with a light tip can be formed to have substantially the same shape, it is possible to suppress rotational synchronous vibration and rotational asynchronous vibration while maintaining the performance of the blade. it can.

A rotor according to a second aspect of the present invention is the rotor of the first aspect , wherein each of the platforms of the plurality of blades has a contact portion that is in contact with a platform adjacent in the circumferential direction.

A steam turbine according to a first aspect of the present invention includes the rotor according to any one of the first aspect to the eighth aspect, and a casing that covers an outer peripheral side of the rotor.

According to one aspect of the present invention, it is possible to suppress rotation-synchronous vibration and also suppress rotation-nonsynchronization vibration.

It is a typical sectional view of a steam turbine in a first embodiment concerning the present invention. It is a perspective view of a moving blade row in a first embodiment concerning the present invention. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a schematic diagram of a bucket in a first embodiment concerning the present invention. It is a figure which shows the shroud which adjoins the moving blade in 1st embodiment which concerns on this invention, and a figure which shows the adjacent stub (b). It is a figure which shows the moving blade row of 1st embodiment of this invention. It is a figure which shows the moving blade row of 2nd embodiment of this invention. It is a figure which shows the moving blade row of 3rd embodiment of this invention. It is a figure which shows the moving blade row|line of 4th embodiment of this invention.

[First embodiment]
1st Embodiment of the rotary machine which concerns on this invention is described with reference to FIGS.

The rotary machine of this embodiment is a steam turbine. As shown in FIG. 1, this steam turbine includes a steam turbine rotor (hereinafter, simply referred to as a rotor) 10 that rotates around an axis Ar, and a steam turbine casing (hereinafter, simply referred to as a casing) that rotatably covers the rotor 10. 30). In the following, the direction in which the axis Ar extends is referred to as the axial direction Da, the circumferential direction with respect to the axial line Ar is simply the circumferential direction Dc, and the radial direction with respect to the axial line Ar is simply the radial direction Dr. Further, one side of the axial direction Da is the upstream side and the other side of the axial direction Da is the downstream side.

In the casing 30, a steam inlet 31 for guiding the steam ST into the casing 30 is formed in an upstream side portion, and a steam outlet 32 for discharging the steam ST passing through the casing 30 to the outside is formed in a downstream side portion. ..

The rotor 10 has a rotor shaft 11 extending in the axial direction Da about the axis Ar and a plurality of moving blade rows 12 arranged in the axial direction Da. Each of the plurality of rotor blade rows 12 is composed of a plurality of rotor blades 13 mounted on the outer circumference of the rotor shaft 11 side by side in the circumferential direction Dc. The steam turbine further includes a row of vanes 38 arranged upstream of each row of blades 12. Each of the plurality of stationary blade rows 38 is configured by a plurality of stationary blades 39 arranged on the inner circumference of the casing 30 side by side in the circumferential direction Dc.

As shown in FIG. 2, the moving blade 13 includes a blade body 14 extending in the radial direction Dr, a platform 15 provided inside the blade body 14 in the radial direction Dr, and a platform 15 provided inside the platform 15 in the radial direction Dr. It has a blade root 16 provided and an outer shroud 17 provided outside the blade body 14 in the radial direction Dr. The outer shroud 17 forms a radially outer end portion of the moving blade 13. The outer shroud 17 is not in contact with the outer shrouds 17 of the moving blades 13 adjacent in the circumferential direction Dc when the rotor 10 is stopped at a normal temperature. Further, the shape and size of the outer shroud 17 are determined so as to come into contact with a part of the outer shroud 17 of the moving blades 13 adjacent to each other in the circumferential direction Dc due to thermal expansion due to temperature rise. As shown in FIG. 2, the steam ST flows between the outside of the platform 15 in the radial direction Dr and the inside of the outer shroud 17 in the radial direction Dr. Therefore, the platform 15 and the outer shroud 17 define a steam flow path through which the steam ST flows.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG. The rotor shaft 11 is provided with a moving blade row 12 including a plurality of moving blades 13 arranged side by side in the circumferential direction Dc. The blade root 16 of each rotor blade 13 engages with a groove provided in the rotor shaft 11 and is attached to the rotor shaft 11.

Further, as shown in FIG. 4, the moving blade 13 may include a stub 18 provided at a substantially central portion of the blade body 14. The stub 18 is not in contact with the stubs 18 of the moving blades 13 that are adjacent to each other in the circumferential direction Dc when the rotor is stopped at the normal temperature. Further, the shape and size of the stub 18 are determined so as to come into contact with the stubs 18 of the moving blades adjacent to each other in the circumferential direction Dc due to the thermal expansion due to the temperature increase.

FIG. 5A shows a state where the outer shrouds of the moving blades adjacent to each other in the circumferential direction Dc are in contact with each other due to the thermal expansion due to the temperature increase, and FIG. 5B shows the thermal expansion due to the temperature increase. Indicates that the stubs of the moving blades adjacent to each other in the circumferential direction Dc are in contact with each other.
The platforms 15 of adjacent moving blades may be in contact with each other due to thermal expansion due to temperature rise.

FIG. 6 shows a rotor blade row 112 according to the first embodiment of the present invention.
In this moving blade row 112, the moving blades 113a having a heavy tip portion and the moving blades 113b having a light tip portion are alternately arranged along the circumferential direction Dc. Here, the tip portion is a portion radially outside the center of the blade body in the radial direction.

The heavy blade 113a at the tip portion and the light blade 113b at the tip portion respectively have a blade body 114 extending in the radial direction Dr, a platform 115 provided inside the blade body 114 in the radial direction Dr, and this platform 115. A blade root 116 provided on the inside in the radial direction Dr and an outer shroud 117 provided on the outside of the blade body 114 in the radial direction Dr.

The heavy blade 113a at the tip portion is formed such that the thickness of the outer shroud 117 in the radial direction Dr is thick, and the light blade 113b at the tip portion is thin in the radial direction Dr of the outer shroud 117. Is formed. That is, the thickness of the outer shroud 117 of the moving blade 113a at the tip end in the radial direction Dr is larger than the thickness of the outer shroud 117 of the adjacent moving blade 113b at the tip end in the radial direction Dr. The thickness of the outer shroud 117 of the light moving blade 113b in the radial direction Dr is smaller than the thickness of the outer shroud 117 of the adjacent heavy blades 113a in the radial direction Dr. Further, the outer diameter of each of the moving blades 113a and 113b of the moving blade row 112, that is, the outer diameter of the outer shroud 117 is formed to be substantially the same. Therefore, the length of the blade body 114 in the radial direction Dr is different between the heavy blade 113a at the tip and the light blade 113b at the tip, and the length of the blade 114 in the radial direction Dr of the blade 114 at the tip is light. The length is longer than the length in the radial direction Dr of the blade body 114 of the light blade 113a at the tip end portion by the difference in the thickness in the radial direction Dr of the outer shroud 117.

Adjacent blades 113a, 113b are in contact with each other at outer shroud 117 and/or platform 115. The moving blades 113a and 113b adjacent to each other may each include the stub 118, and may contact each other at the stub 118.

With such a configuration, since the outer shrouds 117 of the adjacent moving blades 113a and 113b have different masses, the adjacent moving blades 113a and 113b also have different masses. As a result, the natural frequencies of the heavy blade 113a at the tip and the blade 113b at the tip are different from each other. Therefore, the swing widths (amplitudes) of the adjacent heavy blades 113a and the light blades 113b at the tip end are different from each other, and one of the heavy blades 113a at the tip and the light blades 113b at the tip is moved. The sliding amount of the blade with respect to the other moving blade also changes in each of the moving blades 113a and 113b. Thereby, friction damping due to a contact portion (for example, the outer shroud 117, the platform 115, and/or the stub 118) between the moving blades 113a and 113b adjacent to each other is increased, so that rotational synchronous vibration (for example, resonance) is suppressed. In addition, non-rotational vibration (for example, random vibration, self-excited vibration, forced vibration, etc.) can be suppressed.

[Second embodiment]
FIG. 7 shows a rotor blade row 212 in which heavy blades 213b at the tip and light blades 213a at the tip are alternately arranged during operation when viewed from the outside in the radial direction Dr. In this moving blade row 212, the moving blades 213b having a heavy tip portion and the moving blades 213a having a light tip portion are alternately arranged along the circumferential direction Dc. Outer shrouds 217a and 217b are provided on the radial outer ends of the blade 213b having a heavy tip and the blade 213a having a light tip, respectively. At least one groove 220 is formed on the outer peripheral surface of the outer blade of the light blade 213a at the tip portion on the outer side of the outer shroud 217a in the radial direction Dr. A plurality of grooves 220 may be formed on the outer peripheral surface, and the shape of the grooves 220 may be circular or rectangular.

Due to these grooves 220, the mass of the moving blade 213a having a light tip is lighter than that of the heavy moving blade 213b having an adjacent tip. That is, the shape of the blades 213b having a heavy tip portion and the shape of the blades 213a having a light tip portion, except for at least one groove 220 formed on the outer peripheral surface of the outer shrouds 217b, 217a on the outer side in the radial direction Dr, It is almost the same. The heavy blade 213b at the tip portion and the light blade 213a at the tip portion each have a blade body extending in the radial direction Dr, a platform provided inside the radial direction Dr of the blade body, and a diameter of the platform. The blade has a blade root provided inside the direction Dr, an outer shroud provided outside the radial direction Dr of the blade, and a stub provided at a substantially central portion of the blade.

Further, in such a configuration, at least one groove 220 may be filled with a filler having a density less than that of the material forming the outer shrouds 217a, 217b. As an example of the filler, a metal material or a composite material can be applied. Examples of composite materials are carbon fiber resins, epoxy resins, ceramic resins and the like. It should be noted that due to the thermal expansion that accompanies the temperature increase, the adjacent blades 213a and 213b are in contact with each other at the outer shroud, stub, and/or platform.

With such a configuration, in the rotor blade row 212, the mass of the outer shrouds 217a and 217b is increased by the groove 220 or the filler filled in the groove 220 and having a lighter density than the material of the outer shroud. Since they are different, the masses of the moving blades 213a and 213b adjacent to each other are different from each other. Therefore, the swing widths (amplitudes) of the adjoining heavy moving blades 213b and the tip light moving blades 213a are different from each other, and the movement of one of the heavy tip moving blades 213b and the light tip moving blades 213a is different. The sliding amount of the blade with respect to the other moving blade also changes in each of the moving blades 213a and 213b. Thereby, the friction damping due to the contact portion (for example, the outer shroud, the platform, and/or the stub) between the adjacent moving blades 213a and 213b is increased, so that the rotation synchronous vibration (for example, resonance etc.) is suppressed, and Non-rotational vibration (eg, random vibration, self-excited vibration, forced vibration, etc.) can also be suppressed.

Further, with such a configuration, the moving blade 213b having a heavy tip portion and the moving blade 213a having a light tip portion have at least one groove 220 or the groove 220 formed on the outer peripheral surface of the outer shroud 217a on the outer side in the radial direction Dr. Since they have substantially the same shape except for the filler filled therein, it is possible to suppress the rotation synchronous vibration and the rotation asynchronous vibration while maintaining the performance of the moving blades 213a and 213b.

[Third embodiment]
Further, FIG. 7 may show a row of blades 212 in which heavy blades 213a at the tip and light blades 213b at the tip are alternately arranged during operation when viewed from the outside in the radial direction Dr. ..
The difference between the second embodiment and the third embodiment is only that the component denoted by reference numeral 213a is a blade with a heavy tip or a blade with a light tip.

In this moving blade row 212, the moving blades 213a having a heavy tip portion and the moving blades 213b having a light tip portion are alternately arranged along the circumferential direction Dc. Outer shrouds 217a and 217b are provided on the radial outer ends of the blade 213a having a light tip and the blade 213b having a heavy tip, respectively. At least one groove 220 is formed on the outer peripheral surface of the outer shroud 217a of the heavy blade 213a at the tip end on the outer side in the radial direction Dr. A plurality of grooves 220 may be formed on the outer peripheral surface, and the shape of the grooves 220 may be circular or rectangular.

Further, at least one groove 220 formed in the outer shroud 217a is filled with a filler having a heavier density than that of the material forming the outer shrouds 217a, 217b. That is, the shape of the moving blade 213a having a heavy tip portion and the shape of the moving blade 213b having a light tip portion are filled in at least one groove 220 formed in the outer circumferential surface of the outer shroud 217a in the radial direction Dr and the groove 220. Approximately the same, except for the fillers mentioned.

With such a configuration, in the rotor blade row 212, the mass of the outer shrouds 217a and 217b is increased by the groove 220 and the filler filled in the groove 220 and having a higher density than the material of the outer shroud. Since they are different, the masses of the moving blades 213a and 213b adjacent to each other are different from each other. Therefore, the swing widths (amplitudes) of the adjoining heavy blades 213a and the tip light blades 213b are different from each other, and the movement of one of the tip heavy blades 213a and the tip light blades 213b is different. The sliding amount of the blade with respect to the other moving blade also changes in each of the moving blades 213a and 213b. Thereby, the friction damping due to the contact portion (for example, the outer shroud, the platform, and/or the stub) between the adjacent moving blades 213a and 213b is increased, so that the rotation synchronous vibration (for example, resonance etc.) is suppressed, and Non-rotational vibration (eg, random vibration, self-excited vibration, forced vibration, etc.) can also be suppressed.

Further, with such a configuration, the moving blade 213a having a heavy tip portion and the moving blade 213b having a light tip portion have at least one groove 220 or the groove 220 formed on the outer peripheral surface of the outer shroud 217a on the outer side in the radial direction Dr. Since they have substantially the same shape except for the filler filled therein, it is possible to suppress the rotation synchronous vibration and the rotation asynchronous vibration while maintaining the performance of the moving blades 213a and 213b.

[Fourth Embodiment]
FIG. 8 shows a row of blades 312 in which heavy blades 313a at the tip and light blades 313b at the tip are alternately arranged during operation when viewed from the outside in the radial direction Dr. In the moving blade row 312, the moving blades 313a having a heavy tip portion and the moving blades 313b having a light tip portion are alternately arranged along the circumferential direction Dc. Outer shrouds 317a and 317b are provided at the tips of the blades 313a having a heavy tip and the blades 313b having a light tip, respectively.

At least one groove 320, 322 is formed on the outer peripheral surface of the outer shrouds 317a, 317b on the outer side in the radial direction Dr. The shape of these grooves 320, 322 may be the same or different in each blade.

Further, at least one groove 320, 322 formed in the outer shrouds 317a, 317b is filled with a filler, respectively. The filler filled in the groove 320 of the moving blade 313a having a heavy tip has a heavier density than the density of the filler filled in the groove 322 of the moving blade 313b having a light tip. In the case where the shapes of the grooves 320 and 322 of the heavy blade 313a at the tip and the light blade 313b at the tip are the same, that is, the grooves 320 of the blade 313a at the tip and light blade 313b at the tip, When the total volume of 322 is the same, the amount of the filler filled in the grooves 320 and 322 is the same, and the moving blade filled with the filling having a high density becomes the moving blade 313a having a heavy tip. Further, when the shapes of the grooves 320 and 322 of the heavy blades 313a at the tip and the light blades 313b at the tip are different from each other, that is, the grooves of the blades 313a at the tip and light blades 313b at the tip are different. When the volumes are different from each other, the larger the product of the volume of the groove filled with the filler and the density of the filler is, the larger the moving blade 313a at the tip end becomes.

The heavy blade 313a at the tip portion and the light blade 313b at the tip portion each have a blade body extending in the radial direction Dr, a platform provided inside the radial direction Dr of the blade body, and a diameter of this platform. The blade has a blade root provided inside the direction Dr, an outer shroud provided outside the radial direction Dr of the blade, and a stub provided at a substantially central portion of the blade.

With such a configuration, in the rotor blade row 312, the mass of the outer shrouds 317a and 317b is different depending on the grooves 320 and 322 and the filler filled in the grooves 320 and 322. The masses are formed to be different from each other.
Therefore, the swing widths (amplitudes) of the adjoining heavy blades 313a and the tip light blades 313b are different from each other, and one of the heavier tip blades 313a and the tip light blade 313b moves. The sliding amount of the blade with respect to the other moving blade also changes in each of the moving blades 313a and 313b. Thereby, the friction damping due to the contact portion (for example, the outer shroud, the platform, and/or the stub) between the adjacent moving blades 313a and 313b is increased, so that the rotation synchronous vibration (for example, resonance etc.) is suppressed and Non-rotational vibration (eg, random vibration, self-excited vibration, forced vibration, etc.) can also be suppressed.

Further, with such a configuration, the moving blade 313a having a heavy tip portion and the moving blade 313b having a light tip portion have at least one groove 320, 322 formed on the outer peripheral surface on the outer side in the radial direction Dr of the outer shrouds 317a, 317b. Alternatively, except for the filler filled in the grooves 320 and 322, the grooves have substantially the same shape, so that the rotation synchronous vibration and the rotation asynchronous vibration can be suppressed while maintaining the performance of the moving blades 313a and 313b.

[Fifth Embodiment]
FIG. 9 shows a row of blades 412 in which light blades 413a at the tip end and heavy blades 413b at the tip end are alternately arranged during operation when viewed from the outside in the radial direction Dr.

In this row 412 of moving blades, moving blades 413a having a light tip portion and blades 413b having a heavy tip portion are alternately arranged along the circumferential direction Dc. The light blade 413a at the tip portion and the heavy blade 413b at the tip portion respectively have a blade body 414 extending in the radial direction Dr, a platform 415 provided inside the blade body 414 in the radial direction Dr, and this platform 415. And a blade root 416 provided inside the radial direction Dr.

The moving blades 413a and 413b adjacent to each other in the circumferential direction Dc are formed so as to come into contact with each other on the platform 415 due to thermal expansion due to temperature rise. Further, at least one groove 420 is provided on the outer peripheral surface of the light blade 413a at the tip end portion on the outer side in the radial direction Dr of the blade body 414. The groove 420 may be formed anywhere on the outer peripheral surface of the blade body 414 outside the radial direction Dr. Further, the groove 420 may be filled with a filler having a density lighter than that of the material forming the blade 414.

Further, FIG. 9 may show a moving blade row 412 in which light moving blades 413b at the leading end and heavy moving blades 413a at the leading end are alternately arranged during operation when viewed from the outside in the radial direction Dr. .. In this row 412 of moving blades, moving blades 413b having a light tip portion and blades 413a having a heavy tip portion are alternately arranged along the circumferential direction Dc.

The light blade 413b at the tip portion and the heavy blade 413a at the tip portion respectively have a blade body 414 extending in the radial direction Dr, a platform 415 provided inside the blade body 414 in the radial direction Dr, and this platform 415. And a blade root 416 provided inside the radial direction Dr. Further, at least one groove 420 is provided on the outer peripheral surface of the blade 414 on the outer side in the radial direction Dr of the heavy blade 413a, and the material forming the blade 414 is provided in the groove 420. Fillers having a heavier density can also be filled. With such a configuration, the moving blade 413b having a light tip portion and the moving blade 413a having a heavy tip portion can be realized.

Further, FIG. 9 shows a light moving blade 413b having a tip portion in which at least one groove is not formed. However, the light moving blade 413b having a light tip portion is formed on the outer peripheral surface of the blade body 414 on the outer side in the radial direction Dr. May be provided with at least one groove. When grooves are provided in both the blades 413a having a heavy tip portion and the blades 413b having a light tip portion, these grooves are respectively filled with a filler, and the inside of the groove in the blades 413a having a heavy tip portion is filled. The filling agent filled in may be heavier than the density of the filling agent filled in the groove in the blade 413b having the light tip.

Further, when the shapes of the grooves of the heavy blade 413a at the tip and the blade 413b at the tip are the same, that is, the total volume of the grooves of the blade 413a at the tip and the blade 413b at the tip are the same. , The amount of the filler filled in the groove is the same, and the moving blade filled with the filling having a high density may be the moving blade 413b having a heavy tip. Alternatively, in the case where the shapes of the grooves of the heavy blade 413a at the tip and the blades 413b at the tip are different from each other, that is, the volume of the groove of the blade 413a at the tip and the blade 413b at the tip are different. When the values are different from each other, the one obtained by multiplying the volume of the groove by the density of the filler may be the large moving blade 413b at the tip.

With such a configuration, in the moving blade row 412, the mass of the moving blades 413a and 413b is different depending on the groove 420 or the filler filled in the groove 420, so that the masses of the adjacent moving blades 413a and 413b are different from each other. Is formed as. Therefore, the swing widths (amplitudes) of the adjacent moving blades 413a and 413b are different from each other, and the sliding amount of one moving blade of the moving blades 413a and 413b with respect to the other moving blade also changes in each moving blade 413a and 413b. As a result, the friction damping due to the contact portion (platform 415) between the adjacent moving blades 413a and 413b is increased, so that rotation synchronous vibration (for example, resonance) is suppressed and rotation asynchronous vibration (for example, random vibration, Self-excited vibration, forced vibration, etc.) can also be suppressed.

Further, with such a configuration, since the moving blades 413a and 413b have substantially the same shape, it is possible to suppress the rotation synchronous vibration and the rotation asynchronous vibration while maintaining the performance of the moving blades 413a and 413b.

The embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the scope of the present invention. .. INDUSTRIAL APPLICABILITY The present invention is applicable not only to steam turbines but also to other axial flow rotary machines.

10 Steam turbine rotor (rotor)
Reference Signs List 11 rotor shaft 12 moving blade row 13 moving blade 14 blade body 15 platform 16 blade root 17 outer shroud 18 stub 30 steam turbine casing (casing)
31 steam inlet 32 steam outlet 38 stationary blade row 39 stationary blade 112 moving blade row 113a, 113b moving blade 114 blade body 115 platform 116 blade root 117 outer shroud 118 stub 212 moving blade row 213a, 213b moving blade 217a, 217b outer shroud 220 Groove 312 Moving blade row 313a, 313b Moving blade 317a, 317b Outer shroud 320 Groove 322 Groove 412 Moving blade row 413a, 413b Moving blade 414 Blade body 415 Platform 416 Blade root 420 Groove Ar axial line Da axial direction Dc radial direction Dr circumferential direction vapor

Claims (3)

A rotor shaft that is long in the axial direction around the axis,
A plurality of blades fixed to the rotor shaft portion side by side in the circumferential direction with respect to the axis,
The plurality of blades respectively include a blade body extending in a radial direction with respect to the axis, and a platform provided on the radial inside of the blade, among a radial inner side and a radial outer side with respect to the axis. An outer shroud provided on the outer side in the radial direction of the airfoil, and a stub provided on the airfoil away from the platform and the outer shroud in the radial direction,
Each of the outer shrouds of the plurality of blades has a contact portion that is in contact with outer shrouds adjacent in the circumferential direction ,
Each of the stubs of the plurality of blades has a contact portion that is in contact with stubs adjacent in the circumferential direction,
The outer shroud heavy blades and the outer shroud light blades are alternately arranged in the circumferential direction ,
At least one groove is formed in each of the tip portion of the heavy blade and the tip portion of the light blade,
The at least one groove is filled with a filler,
The filler filled in the at least one groove of the outer shroud heavy blade has a heavier density than the filler filled in the at least one groove of the outer shroud light blade .
Rotor. Each of the platforms of the plurality of blades has a contact portion that contacts adjacent platforms in the circumferential direction,
The rotor according to claim 1. A rotor according to claim 1 or 2 ,
A casing covering the outer peripheral side of the rotor,
A rotating machine equipped with.

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