Rotor wheel, rotor shaft, turbine rotor and gas turbine

Abstract

The rotor disk comprises a disk body and multiple sealing rings. The disk body has a large-diameter portion and a small-diameter portion. The large-diameter portion has multiple blade grooves recessed radially inward and capable of housing the blade roots of rotating blades. The small-diameter portion has an annular groove recessed downstream of the axis and extending circumferentially, and multiple holes for cooling air to flow in. The multiple holes extend circumferentially from the inner circumferential surface of the small-diameter portion to the inner groove side of the annular groove in the region between the multiple blade grooves. The sealing rings have: a ring body that closes the opening of the annular groove and ensures a passage within the annular groove between the ring body and the bottom surface of the annular groove; and a protrusion that protrudes from the ring body downstream of the axis in the region between the blade grooves. The protrusion of the sealing ring has a protrusion communication channel that connects the holes with the passage within the annular groove.

Description

Technical Field

[0001] This invention relates to a rotor disk, a rotor shaft, a turbine rotor, and a gas turbine.

[0002] This application claims priority based on Japanese Patent Application No. 2024-052252, filed on March 27, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] A gas turbine includes: a compressor that compresses air to generate compressed air; a combustor that burns fuel in the compressed air to generate combustion gas; and a turbine driven by the combustion gas. The turbine includes: a turbine rotor that rotates about an axis; and a turbine housing that covers the turbine rotor. The turbine rotor includes: a rotor shaft that rotates about an axis and extends along the axial direction; and multiple rows of rotating blades. The multiple rows of rotating blades are arranged along the axial direction. Each row of rotating blades has multiple rotating blades arranged circumferentially relative to the axis. The rotor shaft is, for example, constructed by stacking multiple rotor disks along the axial direction.

[0004] The structure of the rotor disk is disclosed in Patent Document 1 below. The rotor disk includes: a disk body; and multiple sealing rings mounted on the disk body.

[0005] The disk body has a cylindrical large-diameter portion centered on an axis and an annular small-diameter portion centered on the axis. The large-diameter portion has multiple blade grooves recessed radially inward from the outer circumference, capable of housing the blade roots of rotating blades. The small-diameter portion has: an annular groove recessed downstream from the front end of the small-diameter portion towards the axis and extending circumferentially relative to the axis; and multiple holes extending radially. The annular groove communicates with the multiple blade grooves. The multiple holes penetrate from the inner circumferential surface of the small-diameter portion to the inner groove side facing radially outward in the surface defining the annular groove. Multiple first holes are formed in the region between the multiple blade grooves in the circumferential direction, i.e., the region between blade grooves. Multiple second holes are formed in the region where the multiple blade grooves exist in the circumferential direction, i.e., the blade groove region.

[0006] The sealing ring has: a ring body forming an annular groove channel between the bottom surface of the annular groove and the surface defining the annular groove, facing upstream of the axis; and a protrusion protruding from the ring body towards the downstream of the axis in the region between the blade grooves. The protrusion contacts the bottom surface of the annular groove and circumferentially divides the annular groove channel.

[0007] Cooling air for cooling the rotating blades can flow into multiple holes. The cooling air flowing into the multiple second holes flows into the blade slots via an annular channel formed by an annular groove. The cooling air flowing into the blade slots flows into the rotating blades from the blade root embedded in the blade slots. On the other hand, the cooling air flowing into the first hole cannot flow into the annular channel communicating with the blade slots through the protrusion of the sealing ring. That is, no cooling air is supplied to the rotating blades from the first hole.

[0008] Tensile stress is generated in the rotor disk when it rotates around its axis. The tensile stress generated in the rotor disk is concentrated near the opening of the hole. Therefore, in the technology described in Patent Document 1 below, in addition to providing a second hole that can supply cooling air to the rotating blades, a first hole that cannot supply cooling air to the rotating blades is also provided to mitigate the stress concentration near the opening of the second hole.

[0009] Previous technical documents

[0010] Patent documents

[0011] Patent Document 1: Japanese Patent Application Publication No. 2020-193564 Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] In recent years, in order to improve the efficiency of gas turbines, the temperature of the combustion gas delivered from the combustor to the turbine has increased. If the temperature of the combustion gas increases, it is necessary to increase the amount of cooling air used to cool the rotating blades exposed to the combustion gas.

[0014] In the technology described in Patent Document 1, one method to increase the amount of cooling air flowing into the rotating blades is to increase the diameter of the second hole. However, this method requires machining the wheel body, which increases machining costs.

[0015] Therefore, the object of the present invention is to provide a technique that can suppress processing costs and also regulate the amount of cooling air flowing into the rotating blades.

[0016] means for solving technical problems

[0017] As one aspect of the invention for achieving the aforementioned objectives, a rotor disk comprises: a disk body; and a plurality of sealing rings mounted on the disk body. The disk body has: a cylindrical large-diameter portion centered on an axis; and a small-diameter portion protruding from the large-diameter portion along an axial direction extending from the axis, protruding on either an upstream or downstream side of the axis, forming a ring shape centered on the axis, and having an outer diameter smaller than the outer diameter of the large-diameter portion. The large-diameter portion has: a large-diameter outer circumferential surface facing radially outward relative to the axis; and a plurality of blade grooves recessed from the large-diameter outer circumferential surface radially inward relative to the axis, capable of housing blade roots for rotating blades. The small-diameter portion has: a small-diameter outer circumferential surface facing the radially outer side; a small-diameter inner circumferential surface facing the radially inner side; a small-diameter end face facing one side, with the edge of the radially outer side connected to the edge of the one side of the small-diameter outer circumferential surface; an annular groove recessed from the small-diameter end face to the opposite side to the one side, and extending circumferentially relative to the axis; a small-diameter connecting channel disposed on each of the plurality of blade slots, and communicating the space within the annular groove with the space within the blade slot; and a plurality of holes extending radially relative to the axis, and allowing cooling air to flow in. The plurality of holes extend from the small-diameter inner circumferential surface to the inner groove side facing the radially outer side of the surface defining the annular groove in the circumferential direction relative to the axis and in any one of the regions between the plurality of blade slots, i.e., the regions between the plurality of blade slots. The plurality of sealing rings are arranged circumferentially and are respectively embedded in the annular groove. Each of the plurality of sealing rings comprises: a ring body that closes the opening of the annular groove and is spaced apart along the axial direction from the bottom surface of the annular groove facing upstream of the axis in the surface defining the annular groove, thereby ensuring an internal channel within the annular groove between the ring body and the bottom surface of the annular groove; and a protrusion that protrudes from the ring body to the other side in the region between the blade grooves and enters the internal channel within the annular groove. The protrusion of the sealing ring has a protrusion communication channel that connects the hole with the internal channel within the annular groove.

[0018] In this method, the cooling air flowing into the hole flows into the annular groove through the protrusion of the sealing ring. The cooling air flowing into the annular groove then flows into the blade groove through the small-diameter connecting channel. The cooling air flowing into the blade groove then flows into the cooling air channel of the rotating blade embedded in the blade groove, cooling the rotating blade.

[0019] As described above, in this method, cooling air can be supplied to the rotating blades by machining a component much smaller than the main body of the wheel, namely a sealing ring, instead of machining the main body of the wheel. Furthermore, in this method, the flow rate of the cooling air supplied to the rotating blades can be adjusted by appropriately regulating the cross-sectional area of ​​the connecting channel formed in the protrusion of the sealing ring.

[0020] Therefore, this method can suppress processing costs while also regulating the amount of cooling air flowing into the rotating blades.

[0021] As an invention for achieving the above-mentioned objective, the rotor shaft has a plurality of rotor discs in the aforementioned manner, and has a spindle bolt that connects the plurality of rotor discs to each other through the plurality of rotor discs arranged along the axial direction.

[0022] The invention for achieving the stated purpose includes a turbine rotor comprising: a rotor shaft in the stated manner; and rotating blades mounted in the blade slots of each of the plurality of rotor disks.

[0023] A gas turbine according to one aspect of the invention for achieving the above objectives comprises:

[0024] The turbine rotor in one embodiment; and the turbine housing covering the outer periphery of the turbine rotor.

[0025] Invention Effects

[0026] According to one aspect of the present invention, while suppressing processing costs, the amount of cooling air flowing into the rotating blades can also be adjusted. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the structure of a gas turbine as one embodiment of the present invention.

[0028] Figure 2 This is a cross-sectional view of the main part of a turbine as an embodiment of the present invention.

[0029] Figure 3 This is a perspective view of the main part of the rotor disk as one embodiment of the present invention.

[0030] Figure 4 This is a view of the wheel body and rotating blades as an embodiment of the present invention, viewed from the upstream side of the axis.

[0031] Figure 5 yes Figure 4 The VV-line sectional view of the main body of the roulette wheel.

[0032] Figure 6 yes Figure 4 A sectional view of the main body of the roulette wheel along line VI-VI.

[0033] Figure 7 yes Figure 4 View VII of the main body of the roulette wheel.

[0034] Figure 8 This is a diagram showing the sealing ring in one embodiment of the present invention viewed from the radial outer side.

[0035] Figure 9 yes Figure 8 A sectional view of the sealing ring along line IX-IX.

[0036] Figure 10 This is a cross-sectional view of the main part of the rotor disk in one embodiment of the present invention.

[0037] Figure 11 This is a cross-sectional view of a sealing ring in a modified embodiment of the present invention. Detailed Implementation

[0038] Hereinafter, with reference to the accompanying drawings, embodiments of a gas turbine including the rotor disk according to the present invention, and various embodiments of the rotor disk, will be described.

[0039] "Implementation Methods of Gas Turbines"

[0040] The embodiments of the gas turbine according to the present invention will be described with reference to the accompanying drawings.

[0041] like Figure 1 As shown, the gas turbine 10 of this embodiment includes: a compressor 20 capable of compressing air A; a combustor 30 capable of burning fuel F in the air A compressed by the compressor 20 to generate combustion gas G; and a turbine 40 capable of being driven by the combustion gas G.

[0042] The compressor 20 has a compressor rotor 21 that rotates around an axis Ar, a compressor housing 25 covering the compressor rotor 21, and multiple fixed blade rows 26. The turbine 40 has a turbine rotor 41 that rotates around an axis Ar, a turbine housing 45 covering the turbine rotor 41, and multiple fixed blade rows 46. Hereinafter, the direction in which the axis Ar extends is referred to as the axial direction Da, the circumferential direction centered on the axis Ar is simply referred to as the circumferential direction Dc, and the direction perpendicular to the axis Ar is referred to as the radial direction Dr. Furthermore, one side in the axial direction Da is designated as the upstream side Dau, and the opposite side is designated as the downstream side Dad. Also, in the radial direction Dr, the side closest to the axis Ar is designated as the radially inner side Dri, and the opposite side is designated as the radially outer side Dro.

[0043] The gas turbine 10 of this embodiment also includes an intermediate housing 16. The compressor 20 is disposed upstream of the turbine 40 on the axial direction Da. The intermediate housing 16 is disposed between the compressor housing 25 and the turbine housing 45 in the axial direction Da, and connects the compressor housing 25 and the turbine housing 45. The compressor rotor 21 and the turbine rotor 41 are located on the same axial direction Ar and are connected to each other to form a gas turbine rotor 11. For example, a generator rotor GEN is connected to this gas turbine rotor 11. Furthermore, the compressor housing 25, the intermediate housing 16, and the turbine housing 45 are connected to each other to form a gas turbine housing 15.

[0044] The compressor rotor 21 has a rotor shaft 22 extending along the axial direction Da with axis Ar as its center, and multiple rows of rotating blades 23 mounted on the rotor shaft 22. The multiple rows of rotating blades 23 are arranged along the axial direction Da. Each row of rotating blades 23 consists of multiple rotating blades arranged circumferentially Dc. One of multiple fixed blade rows 26 is disposed downstream of each of the multiple rows of rotating blades 23 on the axial direction Dad. Each fixed blade row 26 is located inside the compressor housing 25. Each fixed blade row 26 consists of multiple fixed blades arranged circumferentially Dc.

[0045] The turbine rotor 41 has a rotor shaft 42 extending along the axial direction Da with axis Ar as its center, and multiple rows of rotating blades 43 mounted on the rotor shaft 42. The multiple rows of rotating blades 43 are arranged along the axial direction Da. Each row of rotating blades 43 consists of multiple rotating blades 44 arranged circumferentially Dc. One of multiple fixed blade rows 46 is disposed on the upstream side Dau of each of the multiple rows of rotating blades 43. Each fixed blade row 46 is located radially inward of the turbine housing 45. Each fixed blade row 46 consists of multiple fixed blades 47 arranged circumferentially Dc.

[0046] like Figure 2 As shown, the turbine housing 45 includes: a cylindrical outer housing 45a forming its outer shell; an inner housing 45b fixed radially inside the outer housing 45a; a plurality of heat-insulating rings 45c fixed radially inside the inner housing 45b; and dividing rings 45d fixed radially inside each of the plurality of heat-insulating rings 45c. The plurality of dividing rings 45d are all positioned between the plurality of fixed blade rows 46. Therefore, a rotating blade row 43 is arranged on the radially inner side Dri of each dividing ring 45d. Furthermore, fixed blades 47 are also fixed on the radially inner side Dri of each of the plurality of heat-insulating rings 45c.

[0047] An annular space between the outer periphery of the rotor shaft 42 and the inner periphery of the turbine housing 45, and arranged in the axial direction Da, forms a combustion gas flow path 49 for the combustion gas G from the burner 30 to flow.

[0048] like Figure 1 As shown, a cooling device 50 is provided on the gas turbine 10 in this embodiment. This cooling device 50 is a device for cooling high-temperature components of the gas turbine that come into contact with high-temperature combustion gases. The cooling device 50 includes: an extraction pipe 51 for extracting compressed air from the intermediate housing 16; a cooler 52 provided in the extraction pipe 51; a cooling air pipe 53 for guiding the compressed air cooled by the cooler 52 as cooling air to the turbine rotor 41, one of the high-temperature components; and a booster compressor 54 provided in the cooling air pipe 53 to pressurize the cooling air. A cooling air flow path 42p is formed on the rotor shaft 42 of the turbine 40. The cooling air flow path 42p extends to a plurality of rotating blades 44 mounted on the rotor shaft 42.

[0049] like Figure 2 As shown, the rotor shaft 42 has: a plurality of rotor discs 42d arranged along the axial direction Da; and a spindle bolt 42s that passes through the plurality of rotor discs 42d in the axial direction Da, thereby connecting the plurality of rotor discs 42d to each other. A plurality of rotating blades 44 constituting a rotating blade row 43 are mounted on one rotor disc 42d. The rotating blade 44 has: a blade body 44b, which is blade-shaped; a platform 44f formed on the radially inner side Dri of the blade body 44b; and a blade root 44r formed on the radially inner side Dri of the platform 44f. A cooling air passage 44p for cooling air flow is formed on the rotating blade 44. An inlet opening of the cooling air passage 44p is formed in the blade root 44r on the bottom surface facing the radially inner side Dri.

[0050] like Figure 1 As shown, compressor 20 compresses air A to generate compressed air. This compressed air flows from compressor 20 into intermediate housing 16. A portion of the compressed air flowing into intermediate housing 16 flows into combustor 30. Fuel F is supplied to combustor 30. In combustor 30, fuel F burns in the compressed air to generate high-temperature, high-pressure combustion gas G. This combustion gas G is delivered from combustor 30 to combustion gas flow path 49 within turbine 40. As combustion gas G flows downstream of axis in combustion gas flow path 49, it causes turbine rotor 41 to rotate. The rotation of turbine rotor 41 causes the rotor of generator GEN, which is connected to gas turbine rotor 11, to rotate. As a result, generator GEN generates electricity.

[0051] The rotating blades 44 or fixed blades 47 of the turbine 40 are exposed to the high-temperature combustion gas G. Therefore, the rotating blades 44 or fixed blades 47 are cooled by a cooling medium. In this embodiment, the rotating blades 44 are cooled by cooling air from the cooling device 50. A portion of the compressed air generated by the compressor 20 is drawn from the intermediate housing 16. This compressed air flows into the cooler 52 through the extraction pipe 51 and is cooled there. After being pressurized in the booster compressor 54, the compressed air cooled by the cooler 52 flows into the cooling air flow path 42p of the rotor shaft 42 through the cooling air pipe 53 as cooling air Ac. This cooling air Ac flows from the cooling air flow path 42p of the rotor shaft 42 into the cooling air passage 44p of the rotating blades 44, cooling the rotating blades 44.

[0052] The rotor disk 42d described above will be explained in detail below.

[0053] "Implementation Method of Rotor Disk"

[0054] The following is for reference. Figures 2 to 10 The rotor disk in this embodiment will be described.

[0055] like Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 As shown, the rotor disk 60 in this embodiment has a disk body 61, a plurality of sealing rings 90 and a plurality of sealing covers 85.

[0056] The wheel body 61 has a large-diameter portion 62, a small-diameter portion 72, and multiple protrusions 81 and 83. The large-diameter portion 62 is cylindrical about the axis Ar. The small-diameter portion 72 is annular about the axis Ar. The outer diameter of the small-diameter portion 72 is smaller than the outer diameter of the large-diameter portion 62. The small-diameter portion 72 is located on the upstream side Dau of the axis of the large-diameter portion 62. The protrusions 81 and 83 have: an upstream protrusion 81, which protrudes from the upstream side Dau of the axis of the small-diameter portion 72 facing the upstream side Dau of the axis; and a downstream protrusion 83, which protrudes from the downstream side Dad of the axis of the large-diameter portion 62 facing the downstream side Dad of the axis.

[0057] like Figures 2-4 As shown, the large-diameter portion 62 has: a large-diameter outer peripheral surface 63 facing radially outward Dro; and a plurality of blade grooves 64 recessed from the large-diameter outer peripheral surface 63 towards radially inward Dri. The plurality of blade grooves 64 are arranged at equal intervals in the circumferential direction Dc. Each blade groove 64 has a blade groove bottom surface 64b facing radially outward Dro (see reference). Figure 4 The blade root 44r of the rotating blade 44 is mounted on each of the multiple blade slots 64.

[0058] like Figures 3-6As shown, the annular small-diameter portion 72 has a small-diameter outer peripheral surface 73o facing the radially outward Dro, a small-diameter inner peripheral surface 73i facing the radially inward Dri, a small-diameter end face 74 facing the upstream side of the axis Dau, a plurality of small-diameter connecting grooves 75, an annular groove 76, and a plurality of holes 77.

[0059] like Figure 3 , Figure 4 and Figure 6 As shown, the plurality of small-diameter connecting grooves 75 are recessed radially inward toward Dri from the outer peripheral surface 73o of the small diameter to a position further radially inward than the bottom surface 64b of the blade groove. The plurality of small-diameter connecting grooves 75 are formed in any one of the blade groove regions AG, which are located in the circumferential region Dc, where a plurality of blade grooves 64 exist. Each small-diameter connecting groove 75 has a connecting groove bottom surface 75b facing radially outward (Dro). This connecting groove bottom surface 75b is located further radially inward (Dri) than the bottom surface 64b of the blade groove. Therefore, the plurality of small-diameter connecting grooves 75 communicate with any one of the plurality of blade grooves 64.

[0060] like Figures 3-5 As shown, the annular groove 76 is recessed from the small-diameter end face 74 of the small-diameter portion 72 towards the downstream side Dad of the axis and extends circumferentially Dc. The annular groove 76 has: an inner groove side face 76i facing radially outward Dro; an outer groove side face 76o facing radially inward Dri; and an annular groove bottom face 76b facing the upstream side Dau of the axis. The inner groove side face 76i is located further radially inward Dri than the outer groove side face 76o, and is radially opposite the outer groove side face 76o to it in the radial direction Dr. Figure 6 As shown, a portion of the inner groove side 76i of the annular groove 76 forms the bottom surface 75b of the small-diameter connecting groove 75. Therefore, the annular groove 76 is connected to a plurality of small-diameter connecting grooves 75.

[0061] like Figures 3-7As shown, the plurality of holes 77 have a plurality of first holes 77a and a plurality of second holes 77b. The plurality of first holes 77a and the plurality of second holes 77b extend radially Dr and penetrate from the inner circumferential surface 73i of the small diameter portion 72 to the inner groove side surface 76i of the annular groove 76. The plurality of second holes 77b open in the inner groove side surface 76i of the annular groove 76, on the circumferential Dc, and in any one of the blade groove regions AG in which the plurality of blade grooves 64 exist. Furthermore, the plurality of first holes 77a open in the inner groove side surface 76i of the annular groove 76, in any one of the blade groove inter-regions AM on the circumferential Dc, i.e., the inter-blade groove regions AM. Additionally, the blade groove regions AG and the inter-blade groove regions AM are alternately arranged on the circumferential Dc. Therefore, the first holes 77a and the second holes 77b are alternately arranged on the circumferential Dc. Both the first hole 77a and the second hole 77b allow cooling air Ac to flow in from the radially inner side Dri of the annular small diameter portion 72.

[0062] like Figure 3 , Figure 8 and Figure 9 As shown, the sealing ring 90 has a ring body 91 and a protrusion 92. The ring body 91 closes the opening of the annular groove 76 and is spaced apart from the bottom surface 76b of the annular groove along the axial direction Da, thereby ensuring an internal channel 76p in the annular groove between it and the bottom surface 76b. The protrusion 92 has a first protrusion 92A and a second protrusion 92B. Both the first protrusion 92A and the second protrusion 92B protrude from the ring body 91 toward the downstream side Dad of the axis and separate the internal channel 76p of the annular groove in the circumferential direction Dc. The first protrusion 92A protrudes from the ring body 91 toward the downstream side Dad of the axis in the first blade groove inter-region AM1 of the plurality of blade groove inter-regions AM and at the location where the first hole 77a exists. Furthermore, the second protrusion 92B protrudes from the annular body 91 downstream of the axis in the second blade groove inter-region AM2, at the location where the first hole 77a exists. The first blade groove inter-region AM1 and the second blade groove inter-region AM2 are adjacent in the circumferential direction Dc, separated by the blade groove region AG. A first annular groove channel 76pa is formed in the circumferential direction Dc between the first protrusion 92A and the second protrusion 92B through the annular body 91. Furthermore, in the circumferential direction Dc, with the second protrusion 92B as a reference, a second annular groove channel 76pb is formed by the annular body 91 in the region opposite to the first protrusion 92A.

[0063] The first protrusion 92A has an annular bolt hole 93, an inner surface 92Ai, and a connecting groove 92Ag. The annular bolt hole 93 penetrates the first protrusion 92A radially Dr and communicates with a first hole 77a in the region AM1 between the first blade slots. The inner surface 92Ai of the first protrusion faces the inner slot side 76i of the annular slot 76, radially inward Dri. The connecting groove 92Ag is recessed from the inner surface 92Ai of the first protrusion radially outward Dro and extends circumferentially Dc from the annular bolt hole 93, communicating with the inner channel 76pa of the first annular slot. The connecting channel 92Ap of the first protrusion is formed by a portion of the space formed by the annular bolt hole 93 and the space within the connecting groove 92Ag. The first protrusion connects to the first hole 77a and the first annular groove channel 76pa in the region AM1 between the first blade grooves via the first protrusion connecting channel 92Ap.

[0064] The second protrusion 92B has an inner surface 92Bi and a connecting groove 92Bg. The inner surface 92Bi of the second protrusion faces radially inward Dri and is opposite to the inner groove surface 76i of the annular groove 76. The connecting groove 92Bg is recessed from the inner surface 92Bi of the second protrusion towards radially outward Dro and extends circumferentially Dc, connecting the first hole 77a in the region AM2 between the two second blade grooves with the inner channel 76pb of the second annular groove. The connecting channel 92Bp of the second protrusion, which connects the first hole 77a in the region AM2 between the two second blade grooves with the inner channel 76pb of the second annular groove, is formed through the space within the connecting groove 92Bg.

[0065] The first hole 77a has the same cross-sectional area at any position in the radial direction Dr. Similarly, the second hole 77b has the same cross-sectional area at any position in the radial direction Dr. The cross-sectional area of ​​the first hole 77a is the same as that of the second hole 77b. The first convex connecting groove 92Ag has the same cross-sectional area at any position in the circumferential direction Dc. The second convex connecting groove 92Bg has the same cross-sectional area at any position in the circumferential direction Dc. The cross-sectional area of ​​the second convex connecting groove 92Bg is the same as that of the first convex connecting groove 92Ag, and is smaller than the cross-sectional areas of the second hole 77b and the first hole 77a. Therefore, in this embodiment, the minimum cross-sectional area of ​​the first convex connecting channel 92Ap and the second convex connecting channel 92Bp is smaller than the minimum cross-sectional area of ​​the second hole 77b and the first hole 77a.

[0066] like Figure 3 , Figure 7 and Figure 8As shown, the small-diameter portion 72 has a small-diameter bolt hole 79 extending from the outer circumferential surface 73o of the small-diameter portion 72 into the blade slot 64 within the region AM1 between the first blade slots. This small-diameter bolt hole 79 communicates with the annular bolt hole 93 of the first protrusion 92A. Bolts 99 for mounting the sealing ring 90 to the small-diameter portion 72 are inserted into the small-diameter bolt hole 79 and the annular bolt hole 93.

[0067] like Figure 10 As shown, the sealing cap 85 enters the small-diameter connecting groove 75 from the radially outer side (Dro) and closes the opening of the small-diameter connecting groove 75. A gap exists radially (Dr) between the sealing cap 85 and the bottom surface 75b of the connecting groove 75. This gap forms a small-diameter connecting channel 75p that connects the channel 76p within the annular groove to the space within the blade groove 64.

[0068] like Figure 4 , Figure 8 and Figure 10 As shown, cooling air Ac flows into the second hole 77b, which exists in the blade slot region AG on the circumferential direction Dc. Within the second hole 77b, it flows radially outward along the outer edge Dro and into the blade slot 64 via the small-diameter connecting channel 75p. The cooling air Ac flowing into the blade slot 64 enters the cooling air passage 44p from the inlet opening of the cooling air passage 44p of the rotating blade 44 embedded in the blade slot 64. After cooling the rotating blade 44, the cooling air Ac flowing into the cooling air passage 44p exits from the rotating blade 44 into the combustion gas flow path 49. Therefore, the second hole 77b forms a main air hole relative to the rotating blade 44.

[0069] like Figure 4 , Figure 8 and Figure 9 As shown, cooling air Ac flows into the first hole 77a, which exists in the region AM1 between the first blade slots on the circumferential direction Dc, and flows radially outward Dro within the first hole 77a, and flows into the first protrusion connecting channel 92Ap formed on the first protrusion 92A of the sealing ring 90. Cooling air Ac flowing into the first protrusion connecting channel 92Ap flows circumferentially Dc within the first protrusion connecting channel 92Ap, and flows into the blade slot 64 via the first annular groove inner channel 76pa formed between the annular groove 76 and the ring body 91, and the small-diameter connecting channel 75p connected to the first annular groove inner channel 76pa. Cooling air Ac flowing into the blade slot 64 flows into the cooling air channel 44p from the inlet opening of the cooling air channel 44p of the rotating blade 44 embedded in the blade slot 64. Therefore, the first hole 77a forms an auxiliary air hole relative to the rotating blade 44.

[0070] That is, in the rotating blade 44, the cooling air Ac from the second hole 77b in the blade slot region AG flows into the rotating blade 44, and the cooling air Ac from the first hole 77a in the region AM1 between the first blade slots also flows into the rotating blade 44.

[0071] Cooling air Ac flows into the first hole 77a in the region AM2 between the second blade slots on the circumferential Dc. Within the first hole 77a, it flows radially outward (Dro) and into the second protrusion communication channel 92Bp formed on the second protrusion 92B of the sealing ring 90. Cooling air Ac flowing into the second protrusion communication channel 92Bp flows circumferentially (Dc) within the second protrusion communication channel 92Bp and flows into the blade slot 64 via the second annular groove inner channel 76pb formed between the annular groove 76 and the ring body 91, and the small-diameter communication channel 75p connected to the second annular groove inner channel 76pb. Cooling air Ac flowing into the blade slot 64 enters the cooling air channel 44p from the inlet opening of the cooling air channel 44p embedded in the blade root 44r of the blade slot 64. In addition, the rotating blade 44 into which the cooling air Ac flows is a rotating blade 44 adjacent to the rotating blade 44 into which the cooling air Ac flows from the first hole 77a in the region AM1 between the first blade slots on the circumferential Dc, and is a rotating blade 44 existing on the side opposite to the first protrusion 92A on the circumferential Dc with reference to the second protrusion 92B.

[0072] Cooling air Ac from the second hole 77b in the blade groove region AG where the blade groove 64 is embedded also flows into the rotating blade 44 via the small diameter connecting channel 75p and the blade groove 64.

[0073] That is, in the rotating blade 44, the cooling air Ac from the first hole 77a in the region AM2 between the second blade slots flows into the rotating blade 44, and the cooling air Ac from the second hole 77b in the blade slot region AG where the blade slot 64 embedded in the rotating blade 44 also flows into the rotating blade 44.

[0074] As described above, in this embodiment, the spaces formed within the first hole 77a, the second hole 77b, the first protrusion connecting channel 92Ap, the second protrusion connecting channel 92Bp, the annular groove inner channel 76p, the small diameter connecting channel 75p, and the blade groove 64 are used for... Figure 1 and Figure 2 This is a part of the cooling airflow path 42p, which is being described.

[0075] In this embodiment, the auxiliary air hole, or first hole 77a, is primarily designed to mitigate stress concentration near the opening of the main air hole, or second hole 77b. In this embodiment, by machining a component much smaller than the wheel body 61, namely the sealing ring 90, instead of machining the wheel body 61, the cooling air Ac flowing into the auxiliary air hole (first hole) 77a can be delivered to the rotating blade 44. Furthermore, in this method, by appropriately adjusting the cross-sectional area of ​​the protrusion connecting channels 92Ap and 92Bp formed in the sealing ring 90, the flow rate of the cooling air Ac delivered to the rotating blade 44 can be adjusted.

[0076] Therefore, in this embodiment, while suppressing processing costs, it is also possible to regulate the amount of cooling air Ac flowing into the rotating blade 44.

[0077] "Modified examples of rotor disks"

[0078] refer to Figure 11 A modified example of the rotor disk in the above embodiments will be described.

[0079] In the above embodiment, the first protrusion 92A of the sealing ring 90 has a ring bolt hole 93 and a first protrusion communicating groove 92Ag, and the second protrusion 92B of the sealing ring 90 has a second protrusion communicating groove 92Bg. However, as Figure 11 As shown, the first protrusion 92A of the sealing ring 90 may have a first protrusion communicating groove 92Ag, and the second protrusion 92B of the sealing ring 90 may have a ring bolt hole 93 and a second protrusion communicating groove 92Bg. Furthermore, in this modified example, a first protrusion communicating channel 92Ap is formed by the space formed within the first protrusion communicating groove 92Ag, and a second protrusion communicating channel 92Bp is formed by a portion of the space formed within the ring bolt hole 93 and the space formed within the second protrusion communicating groove 92Bg. Moreover, in this modified example, in the small-diameter portion 72, a small-diameter bolt hole 79 communicating with the aforementioned ring bolt hole 93 is formed in the region AM2 between the second blade slots in the circumferential direction Dc where the second protrusion 92B exists.

[0080] Various variations

[0081] In the above embodiments and variations, the cross-sectional shapes of the second hole 77b and the first hole 77a are both circular. However, the cross-sectional shapes of the second hole 77b and the first hole 77a may not be circular, and it is also possible that only one of the cross-sectional shapes is not circular.

[0082] In the above embodiments and modifications, one second hole 77b is provided relative to one blade slot region AG. However, multiple second holes 77b may exist relative to one blade slot region AG.

[0083] In the above embodiments and modifications, protrusion communication grooves 92Ag and 92Bg are formed on the protrusion 92 of the sealing ring 90 along the inner surfaces 92Ai and 92Bi of the protrusion, and the space including the space within the protrusion communication grooves 92Ag and 92Bg is set as protrusion communication channels 92Ap and 92Bp. However, it is also possible to form a hole extending in the circumferential direction Dc at the middle position of the radial direction Dr of the protrusion 92 of the sealing ring 90, and the space within the hole is part of the protrusion communication channels 92Ap and 92Bp. However, when the protrusion 92 does not have a ring bolt hole 93, it is preferable, in the same manner as in the above embodiments and modifications, to form a protrusion communication groove 92Bg on the protrusion 92, and to set the space within the protrusion communication groove 92Bg as the protrusion communication channel 92Bp. This is because, in the case that the protrusion 92 does not have a ring bolt hole 93, in order to form a protrusion connecting channel 92Bp on the protrusion 92, in addition to forming a hole extending in the circumferential direction Dc at the middle position of the radial direction Dr of the protrusion 92, it is also necessary to form a hole extending in the radial direction Dr that communicates with the first hole 77a.

[0084] In the above embodiments and modifications, the sealing ring 90 has two protrusions 92. However, the number of protrusions 92 can be one or more. When there is one protrusion 92, the sealing ring 90 having the first protrusion 92A and the sealing ring 90 having the second protrusion 92B are arranged circumferentially Dc. Furthermore, when there are three protrusions 92, the sealing ring having the first protrusion 92A, the second protrusion 92B and the first protrusion 92A arranged circumferentially Dc, and the sealing ring having the second protrusion 92B, the first protrusion 92A and the second protrusion 92B arranged circumferentially Dc are arranged circumferentially Dc.

[0085] However, when the sealing ring has only one protrusion, the number of sealing rings closing the opening of the annular groove 76 increases, leading to increased installation time. Furthermore, two types of sealing rings 90 need to be prepared: one with a first protrusion and one with a second protrusion. Similarly, when the sealing ring has three protrusions, as described above, two types of sealing rings also need to be prepared. Moreover, when the sealing ring has more than three protrusions, the circumferential length Dc of a single sealing ring becomes longer, making operation more cumbersome. Therefore, considering the above reasons, similar to the above embodiments and variations, it is preferable that the sealing ring has two protrusions.

[0086] In the above embodiments and modifications, the protrusion 92 includes two types: protrusion 92A with an annular bolt hole 93 and protrusion 92B without an annular bolt hole 93. However, all protrusions may have an annular bolt hole 93. Furthermore, all protrusions may not have an annular bolt hole 93. However, among the plurality of sealing rings, at least one sealing ring preferably has one protrusion with an annular bolt hole. This is to determine the circumferential position of the plurality of sealing rings within the annular groove 76 of the small-diameter portion 72.

[0087] In the above embodiments and modifications, the small-diameter portion 72 protrudes from the large-diameter portion 62 towards the upstream side of the axis (Dau). However, the small-diameter portion 72 may also protrude from the large-diameter portion 62 towards the downstream side of the axis (Dad). In this case, the small-diameter end face 74 faces the downstream side of the axis (Dad). Furthermore, the annular groove 76 is recessed from the small-diameter end face 74 towards the upstream side of the axis (Dau). Moreover, the protrusions 92, 92A, and 92B of the sealing ring 90 protrude from the ring body 91 of the sealing ring 90 towards the upstream side of the axis (Dau).

[0088] Furthermore, in the above embodiments and modifications, the protrusions 92, 92A, and 92B of the sealing ring 90 divide the annular groove channel 76p on the circumferential Dc. However, the protrusions 92, 92A, and 92B may not divide the annular groove channel 76p on the circumferential Dc.

[0089] This invention is not limited to the embodiments described above. Various additions, modifications, substitutions, partial deletions, etc., can be made without departing from the scope of the patent claims and the conceptual ideas and spirit of the invention derived from their equivalents.

[0090] "appendix"

[0091] The rotor disk 60 in the above embodiments and various modifications are as follows.

[0092] (1) The rotor disk 60 in the first embodiment includes:

[0093] A wheel body 61 and a plurality of sealing rings 90 are mounted on the wheel body 61. The wheel body 61 has: a cylindrical large-diameter portion 62 centered on an axis Ar; and a small-diameter portion 72, protruding from either the upstream side Dau or the downstream side Dad of the axis extending from the large-diameter portion 62 toward the axis Ar in an axial direction Da, forming a ring shape centered on the axis Ar, and having an outer diameter smaller than the outer diameter of the large-diameter portion 62. The large-diameter portion 62 has: a large-diameter outer peripheral surface 63 facing radially outward Dro relative to the axis Ar; and a plurality of blade grooves 64 recessed from the large-diameter outer peripheral surface 63 toward radially inward Dri relative to the axis Ar, and capable of mounting blade roots 44r of rotating blades 44. The small-diameter portion 72 has: a small-diameter outer peripheral surface 73o facing the radially outer side Dro; a small-diameter inner peripheral surface 73i facing the radially inner side Dri; a small-diameter end face 74 facing the side Dau, and the edge of the radially outer side Dro is connected to the edge of the side Dau of the small-diameter outer peripheral surface 73o; an annular groove 76 recessed from the small-diameter end face 74 toward the opposite side Dad to the side Dau, and extending along the circumferential direction Dc relative to the axis Ar; a small-diameter connecting channel 75p provided on each of the plurality of blade slots 64, and communicating the space within the annular groove 76 with the space within the blade slot 64; and a plurality of holes 77a extending radially Dr relative to the axis Ar, and capable of allowing cooling air Ac to flow in. The plurality of holes 77a are all located on the circumferential direction Dc relative to the axis Ar, and in any one of the inter-blade groove regions AM between the plurality of blade grooves 64, extending from the inner circumferential surface 73i to the inner groove side 76i of the surface defining the annular groove 76, facing the radially outer Dro. The plurality of sealing rings 90 are arranged along the circumferential direction Dc and are respectively embedded in the annular grooves 76. Each of the plurality of sealing rings 90 has: a ring body 91 that closes the opening of the annular groove 76 and is spaced apart along the axial direction Da from the bottom surface 76b of the annular groove 76 facing upstream of the axis on the surface defining the annular groove 76, thereby ensuring an annular groove channel 76p between the ring body 91 and the bottom surface 76b; and protrusions 92, 92A, and 92B that protrude from the ring body 91 toward the other side Dad in the region AM between the blade grooves and enter the annular groove channel 76p. The protrusions 92, 92A, and 92B of the sealing ring 90 have protrusion communication channels 92Ap and 92Bp that connect the hole 77a to the annular groove channel 76p.

[0094] In this configuration, the cooling air Ac flowing into the hole 77a flows into the annular groove channel 76p via the protrusions 92, 92A, and 92B of the sealing ring 90, connecting to the channels 92Ap and 92Bp. The cooling air Ac flowing into the annular groove channel 76p flows into the blade groove 64 via the small-diameter connecting channel 75p. The cooling air Ac flowing into the blade groove 64 flows into the cooling air channel 44p of the rotating blade 44 embedded in the blade groove 64, cooling the rotating blade 44.

[0095] As described above, in this method, cooling air Ac can be supplied to the rotating blades 44 by machining a component much smaller than the disk body 61, namely the sealing ring 90, instead of machining the disk body 61. Moreover, in this method, the flow rate of cooling air Ac supplied to the rotating blades 44 can be adjusted by appropriately adjusting the cross-sectional area of ​​the protrusion connecting channels 92Ap and 92Bp formed in the sealing ring 90.

[0096] Therefore, in this method, while suppressing processing costs, the amount of cooling air Ac flowing into the rotating blades 44 can also be adjusted.

[0097] (2) In the rotor disk 60 of the second embodiment, the convex portions 92, 92A, and 92B of the sealing ring 90 have inner convex surfaces 92Ai and 92Bi and convex connecting grooves 92Ag and 92Bg. The inner convex surfaces 92Ai and 92Bi face the radially inner side Dri and are opposite the inner groove surface 76i of the annular groove 76. The convex connecting grooves 92Ag and 92Bg are recessed from the inner convex surfaces 92Ai and 92Bi toward the radially outer side Dro and extend along the circumferential direction Dc to communicate with the inner channel 76p of the annular groove. The convex connecting channels 92Ap and 92Bp are formed by having the space within the convex connecting grooves 92Ag and 92Bg.

[0098] A hole extending circumferentially (Dc) can be formed at the midpoint of the radial direction (Dr) of the protrusion 92 of the sealing ring 90, and the space within this hole can be used as part of the protrusion communication channel. However, in this case, in order to form the protrusion communication channel in the protrusion 92, in addition to forming the hole extending circumferentially (Dc) at the midpoint of the radial direction (Dr) of the protrusion 92, it is also necessary to form a hole extending radially (Dr) that communicates with the hole 77a of the small diameter portion 72. On the other hand, in this method, the protrusion communication channels 92Ap and 92Bp can be formed within the space of the protrusion communication grooves 92Ag and 92Bg, which are recessed from the inner surfaces 92Ai and 92Bi of the protrusion towards the radially outer direction (Dro) and extend circumferentially (Dc). Thus, in this method, it is not necessary to further form a hole extending radially (Dr) that communicates with the hole 77a of the small diameter portion 72, thereby reducing processing costs.

[0099] (3) The rotor disk 60 in the third embodiment is provided with bolts 99 for fixing the plurality of sealing rings 90 to the disk body 61 respectively. The small-diameter portion 72 has a small-diameter bolt hole 79 that extends from the outer peripheral surface 73o of the small diameter portion into the annular groove 76 in the region AM between the blade grooves and allows the bolt to be inserted. The protrusion 92A of the sealing ring 90 has an annular bolt hole 93, an inner surface 92Ai of the protrusion, and a protrusion communicating groove 92Ag. The annular bolt hole 93 extends through the protrusion 92A along the radial direction Dr and communicates with the small-diameter bolt hole 79, thereby allowing the bolt 99 to be inserted. The inner surface 92Ai of the protrusion faces the inner groove surface 76i of the annular groove 76 towards the radially inner side Dri. The protrusion communication groove 92Ag is recessed from the inner surface 92Ai of the protrusion toward the radially outer side Dro, and extends from the annular bolt hole 93 along the circumferential direction Dc to communicate with the channel 76p inside the annular groove. The protrusion communication channel 92Ap is formed by a portion of the space formed by the annular bolt hole 93 and the space inside the protrusion communication groove 92Ag.

[0100] In this method, a portion of the space formed by the annular bolt hole 93 that penetrates the protrusion 92A radially is used as part of the protrusion connecting channel 92Ap, thus suppressing processing costs.

[0101] (4) In the rotor disk 60 of the fourth embodiment, the protrusions 92A and 92B in the rotor disk 60 of the first embodiment have: a first protrusion 92A, which protrudes from the annular body 91 in the first blade groove inter-region AM1 of the plurality of blade groove inter-regions AM; and a second protrusion 92B, which protrudes from the annular body 91 in the second blade groove inter-region AM2 of the plurality of blade groove inter-regions AM that is adjacent to the first blade groove inter-region AM1 in the circumferential direction Dc. The first protrusion 92A of the sealing ring 90 has a first protrusion communication channel 92Ap, which is the protrusion communication channel 92Ap that connects the hole 77a in the first blade groove inter-region AM1 of the plurality of holes 77a with the annular groove channel 76p, i.e., the first annular groove channel 76pa, formed in the annular groove 76 between the first protrusion 92A and the second protrusion 92B. The second protrusion 92B of the sealing ring 90 has a second protrusion communication channel 92Bp, which is the protrusion communication channel 92Bp that connects the hole 77a in the region AM2 between the two second blade slots among the plurality of holes 77a with the annular groove 76p, i.e. the second annular groove channel 76pb, formed on the circumferential Dc with reference to the second protrusion 92B on the side opposite to the first protrusion 92A.

[0102] When the sealing ring 90 has only one protrusion 92, the number of sealing rings 90 that close the opening of the annular groove 76 increases, leading to an increase in the installation time of the sealing rings 90. Furthermore, when the sealing ring 90 has three or more protrusions 92, the circumferential length of one sealing ring 90 on the Dc direction becomes longer, making operation more cumbersome. Therefore, considering the above reasons, as in this embodiment, the sealing ring 90 preferably has two protrusions 92.

[0103] (5) The rotor disk 60 in the fifth embodiment, as in the rotor disk 60 of the fourth embodiment, includes bolts 99 for fixing the plurality of sealing rings 90 to the disk body 61. The small-diameter portion 72 has a small-diameter bolt hole 79 that extends from the outer peripheral surface 73o of the small diameter portion into the annular groove 76 in the region AM1 between the first blade grooves, allowing the bolt to be inserted. The first protrusion 92A has an annular bolt hole 93, an inner surface 92Ai of the first protrusion, and a communicating groove 92Ag of the first protrusion. The annular bolt hole 93 extends through the first protrusion 92A along the radial direction Dr and communicates with the small-diameter bolt hole 79, thereby allowing the bolt 99 to be inserted. The inner surface 92Ai of the first protrusion faces the inner groove surface 76i of the annular groove 76 towards the radially inner side Dri. The first protrusion communicating groove 92Ag is recessed from the inner surface 92Ai of the first protrusion toward the radially outer Dro, and extends from the annular bolt hole 93 along the circumferential direction Dc to communicate with the inner channel 76pa of the first annular groove. The first protrusion communicating channel 92Ap is formed by a portion of the space formed by the annular bolt hole 93 and the space within the first protrusion communicating groove 92Ag. The second protrusion 92B has a second protrusion inner surface 92Bi and a second protrusion communicating groove 92Bg. The second protrusion inner surface 92Bi faces the radially inner Dri and opposes the inner groove surface 76i of the annular groove 76. The second protrusion communicating groove 92Bg is recessed from the second protrusion inner surface 92Bi toward the radially outer Dro, and extends along the circumferential direction Dc to communicate with the inner channel 76pb of the second annular groove. The second protrusion connecting channel 92Bp is formed through the space within the second protrusion connecting groove 92Bg.

[0104] In this method, one of the two protrusions 92A and 92B of the sealing ring 90, namely the first protrusion 92A, has a ring bolt hole 93. Therefore, by inserting the bolt 99 through the ring bolt hole 93, the sealing ring 90 can be easily positioned and fixed to the small diameter portion 72.

[0105] (6) The rotor disk 60 in the sixth embodiment, as in the rotor disk 60 of the fourth embodiment, includes bolts 99 for fixing the plurality of sealing rings 90 to the disk body 61. The small-diameter portion 72 has a small-diameter bolt hole 79 extending from the outer peripheral surface 73o of the small diameter portion into the annular groove 76 in the region AM2 between the second blade grooves, through which the bolt 99 can be inserted. The first protrusion 92A has a first protrusion inner surface 92Ai and a first protrusion connecting groove 92Ag. The first protrusion inner surface 92Ai faces the inner groove surface 76i of the annular groove 76 towards the radially inner side Dri. The first protrusion connecting groove 92Ag is recessed from the first protrusion inner surface 92Ai towards the radially outer side Dro and extends along the circumferential direction Dc to communicate with the channel 76pa inside the first annular groove. The first protrusion communicating channel 92Ap is formed through the space within the first protrusion communicating groove 92Ag. The second protrusion 92B has an annular bolt hole 93, an inner surface 92Bi of the second protrusion, and a second protrusion communicating groove 92Bg. The annular bolt hole 93 penetrates the second protrusion 92B along the radial direction Dr and communicates with the small-diameter bolt hole 79, thereby allowing the bolt 99 to be inserted. The inner surface 92Bi of the second protrusion faces the inner groove surface 76i of the annular groove 76 towards the radially inner side Dri. The second protrusion communicating groove 92Bg is recessed from the inner surface 92Bi of the second protrusion towards the radially outer side Dro, and extends from the annular bolt hole 93 along the circumferential direction Dc to communicate with the channel 76pb within the second annular groove. The second protrusion communicating channel 92Bp is formed through a portion of the space formed by the annular bolt hole 93 and the space within the second protrusion communicating groove 92Bg.

[0106] In this method, one of the two protrusions 92A and 92B of the sealing ring 90, namely the second protrusion 92B, has a ring bolt hole 93. Therefore, by inserting a bolt through the ring bolt hole 93, the sealing ring 90 can be easily positioned and fixed to the small diameter portion 72.

[0107] (7) In the rotor disk 60 of the seventh method, in any of the first to sixth methods, the minimum cross-sectional area of ​​the protrusion connecting channels 92Ap and 92Bp is smaller than the minimum cross-sectional area of ​​the hole 77a.

[0108] (8) In the rotor disk 60 of the eighth embodiment, in any of the first to seventh embodiments, the small-diameter portion 72 has, in addition to having the first hole 77a, which is present in the region AM between the plurality of blade slots, a plurality of second holes 77b. The plurality of second holes 77b extend radially along the radial direction Dr in any of the region AG of the plurality of blade slots 64, and penetrate from the inner circumferential surface 73i of the small diameter to the inner groove side surface 76i of the annular groove 76.

[0109] In this configuration, compared to the case where the hole 77a has only a first hole 77a, more cooling air Ac can be guided to the rotating blade 44. Furthermore, since the small-diameter portion 72 has multiple first holes 77a and multiple second holes 77b, it is possible to mitigate stress concentration near the openings of each hole 77a and 77b.

[0110] The rotor shaft 42 in the above embodiments and various modifications can be understood as follows.

[0111] (9) The rotor shaft 42 in the ninth embodiment has a plurality of rotor discs 60 in any of the first to eighth embodiments, and has a spindle bolt 42s that connects the plurality of rotor discs 60 to each other through the plurality of rotor discs 60 arranged along the axial direction Da.

[0112] The turbine rotor 41 in the above embodiments and various modifications can be understood as follows.

[0113] (10) The turbine rotor 41 in the tenth embodiment includes:

[0114] The rotor shaft 42 and rotating blades 44 in the ninth embodiment are mounted in the blade slots 64 of each of the plurality of rotor disks 60.

[0115] The gas turbine 10 in the above embodiments and various modifications can be understood as follows.

[0116] (11) The gas turbine 10 in the eleventh method includes:

[0117] The tenth embodiment includes a turbine rotor 41 and a turbine housing 45 covering the outer periphery of the turbine rotor 41.

[0118] Industrial availability

[0119] According to one aspect of the present invention, while suppressing processing costs, the amount of cooling air flowing into the rotating blades can also be adjusted.

[0120] Symbol Explanation

[0121] 10-Gas turbine, 11-Gas turbine rotor, 15-Gas turbine housing, 16-Intermediate housing, 20-Compressor, 21-Compressor rotor, 22-Rotor shaft, 23-Rotating blade row, 25-Compressor housing, 26-Fixed blade row, 30-Combustor, 40-Turbine, 41-Turbine rotor, 42-Rotor shaft, 42p-Cooling airflow path, 42d, 60-Rotor disc, 42s-Spindle bolt, 43-Rotating blade row, 44-Rotating blade, 44b-Blade body, 44f-Platform, 44r-Blade root, 42p-Cooling airflow path, 45-Turbine housing, 4 5a - Outer shell, 45b - Inner shell, 45c - Heat insulation ring, 45d - Dividing ring, 46 - Fixed blade row, 47 - Fixed blade, 49 - Combustion gas flow path, 50 - Cooling device, 51 - Extraction pipe, 52 - Cooler, 53 - Cooling air pipe, 54 - Booster, 61 - Wheel body, 62 - Large diameter section, 63 - Large diameter outer circumferential surface, 64 - Blade groove, 64b - Blade groove bottom surface, 72 - Small diameter section, 73o - Small diameter outer circumferential surface, 73i - Small diameter inner circumferential surface, 74 - Small diameter end face, 75 - Small diameter connecting groove, 75b - Connecting groove bottom surface, 75p - Small diameter connecting channel, 76 - Ring 76i - inner groove side surface, 76o - outer groove side surface, 76b - bottom surface of annular groove, 76p - inner channel of annular groove, 76pa - inner channel of the first annular groove, 76pb - inner channel of the second annular groove, 77 - hole, 77a - first hole (or auxiliary air hole), 77b - second hole (or main air hole), 79 - small diameter bolt hole, 81 - upstream protrusion, 83 - downstream protrusion, 85 - sealing cap, 90 - sealing ring, 91 - ring body, 92 - convex part, 92A - first convex part, 92Ai - inner side surface of the first convex part, 92Ag - connecting groove of the first convex part, 92Ap - first convex part 92B-Second convex part, 92Bi-Inner side of the second convex part, 92Bg-Connecting groove of the second convex part, 92Bp-Connecting channel of the second convex part, 93-Ring bolt hole, 99-Bolt, A-Air, Ac-Cooling air, F-Fuel, G-Combustion gas, AG-Blade slot area, AM-Inter-slot area between blade slots, AM1-Inter-slot area between the first blade slots, AM2-Inter-slot area between the second blade slots, Ar-Axis axis, Da-Axis direction, Dau-Upstream side of the axis, Dad-Downstream side of the axis, Dc-Circumferential, Dr-Radial, Dri-Inner radial side, Dro-Outer radial side.

Claims

1. A rotor disc, comprising: The main body of the roulette wheel; and Multiple sealing rings are installed on the wheel body. The roulette wheel body has: The large-diameter portion of the cylinder, centered on the axis; and The smaller diameter portion protrudes from either the upstream or downstream side of the axis extending from the larger diameter portion towards the axis, forming a ring shape centered on the axis, and its outer diameter is smaller than that of the larger diameter portion. The large-diameter portion has: The outer circumferential surface of the larger diameter faces radially outward relative to the axis; and Multiple blade grooves are recessed radially inward from the outer circumference of the large diameter relative to the axis, and are capable of mounting the blade root of a rotating blade. The small-diameter portion has: The outer circumferential surface of the small diameter faces the radially outward direction; The inner circumferential surface of the small diameter faces the radially inner side; The small diameter end face faces the side, and the radially outer edge is connected to the edge of the side of the small diameter outer peripheral surface; An annular groove is recessed from the small-diameter end face to the opposite side to the one side, and extends circumferentially relative to the axis. A small-diameter connecting channel is provided on each of the plurality of blade slots, and the space within the annular slot is connected to the space within the blade slot; and Multiple holes, extending radially relative to the axis, allow cooling air to flow in. Each of the plurality of holes extends from the inner circumferential surface of the small diameter blade groove to the inner groove side facing the radially outward side of the surface defining the annular groove in the circumferential direction relative to the axis and in any one of the regions between the plurality of blade grooves. The plurality of sealing rings are arranged along the circumferential direction and are respectively embedded in the annular grooves. Each of the aforementioned sealing rings has: The annular plate body closes the opening of the annular groove and is spaced apart along the axial direction from the bottom surface of the annular groove facing upstream of the axis in the plane defining the annular groove, thereby ensuring a channel within the annular groove between it and the bottom surface of the annular groove; and The protrusion, in the region between the blade grooves, protrudes from the annular blade body to the other side and enters the channel within the annular groove. The protrusion of the sealing ring has a protrusion communication channel that connects the hole with the channel inside the annular groove.

2. The rotor disc according to claim 1, wherein, The convex portion of the sealing ring has an inner surface and a connecting groove. The inner side of the protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The convex connecting groove is recessed from the inner side of the convex portion toward the radially outer side, and extends along the circumferential direction to communicate with the channel inside the annular groove. The convex connecting channel is formed by having space within the convex connecting groove.

3. The rotor disc according to claim 1, comprising bolts for fixing the plurality of sealing rings to the disc body respectively. The small-diameter portion has a small-diameter bolt hole extending from the outer circumferential surface of the small diameter portion into the annular groove in the region between the blade grooves, through which the bolt can be inserted. The convex portion of the sealing ring has a ring bolt hole, an inner surface of the convex portion, and a connecting groove for the convex portion. The annular bolt hole extends radially through the protrusion and communicates with the small-diameter bolt hole, thereby allowing the bolt to be inserted. The inner side of the protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The convex connecting groove is recessed from the inner side of the convex portion toward the radially outer side, and extends circumferentially from the annular bolt hole to communicate with the channel inside the annular groove. The protrusion connecting channel is formed by a portion of the space formed by the annular bolt hole and the space within the protrusion connecting groove.

4. The rotor disc according to claim 1, wherein, The protrusion has: a first protrusion protruding from the annular body in a region between the first blade grooves of the plurality of blade grooves; and a second protrusion protruding from the annular body in a region between the second blade grooves of the plurality of blade grooves that is circumferentially adjacent to the region between the first blade grooves. The first protrusion of the sealing ring has a first protrusion communication channel, which is a protrusion communication channel that connects the holes in the region between the first blade grooves among the plurality of holes with the annular groove channel formed between the first protrusion and the second protrusion, i.e., the first annular groove channel. The second protrusion of the sealing ring has a second protrusion communication channel, which is a protrusion communication channel that connects the holes in the region between the second blade grooves among the plurality of holes with the annular groove channel formed in the circumferential direction on the side opposite to the first protrusion, i.e., the second annular groove channel, in the annular groove with the second protrusion as a reference.

5. The rotor disc according to claim 4, further comprising bolts for fixing the plurality of sealing rings to the disc body respectively. The small-diameter portion has a small-diameter bolt hole extending from the outer circumferential surface of the small diameter portion into the annular groove in the region between the grooves of the first blade, and allowing the bolt to be inserted. The first protrusion has an annular bolt hole, an inner surface of the first protrusion, and a connecting groove for the first protrusion. The annular bolt hole extends radially through the first protrusion and communicates with the small-diameter bolt hole, thereby allowing the bolt to be inserted. The inner side of the first protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The first protrusion communicating groove is recessed from the inner side of the first protrusion toward the radially outer side, and extends circumferentially from the annular bolt hole to communicate with the channel inside the first annular groove. The first protrusion connecting channel is formed by a portion of the space formed by the annular bolt hole and the space within the first protrusion connecting groove. The second protrusion has an inner surface and a connecting groove. The inner side of the second protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The second protrusion communicating groove is recessed from the inner side of the second protrusion toward the radially outer side, and extends along the circumferential direction to communicate with the channel inside the second annular groove. The second protrusion connecting channel is formed through the space within the second protrusion connecting groove.

6. The rotor disc according to claim 4, further comprising bolts for fixing the plurality of sealing rings to the disc body respectively. The small-diameter portion has a small-diameter bolt hole extending from the outer circumferential surface of the small diameter portion into the annular groove in the region between the grooves of the second blade, and is capable of allowing the bolt to be inserted. The first protrusion has an inner surface and a connecting groove. The inner side of the first protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The first protrusion communicating groove is recessed from the inner side of the first protrusion toward the radially outer side, and extends along the circumferential direction to communicate with the channel inside the first annular groove. The first protrusion connecting channel is formed through the space within the first protrusion connecting groove. The second protrusion has an annular bolt hole, an inner surface of the second protrusion, and a connecting groove for the second protrusion. The annular bolt hole extends radially through the second protrusion and communicates with the small-diameter bolt hole, allowing the bolt to be inserted. The inner side of the second protrusion faces the radially inner side and is opposite to the inner groove side of the annular groove. The second protrusion communicating groove is recessed from the inner side of the second protrusion toward the radially outer side, and extends circumferentially from the annular bolt hole to communicate with the channel inside the second annular groove. The second protrusion connecting channel is formed by a portion of the space formed by the annular bolt hole and the space within the second protrusion connecting groove.

7. The rotor disc according to claim 1, wherein, The minimum cross-sectional area of ​​the connecting channel of the protrusion is smaller than the minimum cross-sectional area of ​​the hole.

8. The rotor disc according to claim 1, wherein, In addition to the first holes, which are located in the regions between the multiple blade slots, the small-diameter portion also has multiple second holes. The plurality of the second holes extend radially in the circumferential direction and in any of the plurality of blade groove regions, and penetrate from the inner circumferential surface of the minor diameter to the inner groove side of the annular groove.

9. A rotor shaft comprising a plurality of rotor discs as described in any one of claims 1 to 8, It also has a spindle bolt that connects the multiple rotor discs to each other by passing through a plurality of rotor discs arranged along the axial direction.

10. A turbine rotor comprising: the rotor shaft as claimed in claim 9; and Rotating blades are installed in the blade slots of each of the plurality of rotor disks.

11. A gas turbine comprising: a turbine rotor as claimed in claim 10; and A turbine housing that covers the outer periphery of the turbine rotor.

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