gas turbine

Abstract

To provide a gas turbine that is easy to assemble. [Solution] The gas turbine comprises a housing including an outer shell of the gas turbine, an inner shell located inside the outer shell, and a strut 11d extending in a direction intersecting the axial direction of the gas turbine and connecting the outer shell and the inner shell; a generator 7 located inside the inner shell, which includes a generator wire extending to the outside of the generator; and an external wire 100 extending through the outer shell from the outside to the inside and through the strut, which is connected to the generator wire, wherein the connection portion between the external wire and the generator wire is located inside the inner shell.

Description

Technical Field

[0001] This disclosure relates to a gas turbine.

Background Art

[0002] Patent Document 1 discloses a two-shaft gas turbine engine. The gas turbine engine includes a rotating shaft housed in an inner casing of a casing, a generator located inside a cylinder body inside the inner casing, and an electric auxiliary machine attached to an outer peripheral surface of an outer casing of the casing. The generator is driven by the rotational driving force of the rotating shaft to generate electricity, and the generated electric power is supplied to the electric auxiliary machine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The wiring for transmitting the electric power generated by the generator to the electric auxiliary machine extends from the electric auxiliary machine to the generator through the outer casing, the inner casing, and the cylinder body. The connector at the tip of the wiring is connected to the connector of the generator at the same axial position as the strut that connects the inner casing and the cylinder body. Therefore, the arrangement work of the wiring becomes complicated.

[0005] One aspect of this disclosure aims to provide a gas turbine that facilitates assembly.

Means for Solving the Problems

[0006] A gas turbine according to one aspect of the present disclosure comprises a housing including an outer shell of the gas turbine, an inner shell located inside the outer shell, and struts extending in a direction intersecting the axial direction of the gas turbine and connecting the outer shell and the inner shell; a generator located inside the inner shell, including generator wires extending to the outside of the generator; and external wires extending through the outer shell from the outside to the inside and through the struts, which are connected to the generator wires, wherein the connection portion between the external wires and the generator wires is located inside the inner shell. [Effects of the Invention]

[0007] According to one aspect of this disclosure, the assembly of a gas turbine can be facilitated. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view showing an example of the configuration of a gas turbine according to an embodiment. [Figure 2] Figure 2 is an enlarged cross-sectional view showing the structure from the low-pressure side compressor to the high-pressure side compressor in Figure 1. [Figure 3] Figure 3 is a cross-sectional view showing an enlarged view of the generator in Figure 2. [Figure 4] Figure 4 shows the exit hole in the side wall of the generator housing shown in Figure 3, viewed from the radially outward direction of the axis. [Figure 5] Figure 5 is a view of the generator housing shown in Figure 4, with the partition members attached to the drawer holes, from the outside in the radial direction of the axis. [Modes for carrying out the invention]

[0009] Illustrative embodiments of the present disclosure are described below with reference to the drawings. The embodiments described below are all comprehensive or specific examples. Components in the following embodiments that are not described in the independent claim representing the highest-level concept are described as optional components. The figures in the accompanying drawings are schematic and not necessarily strictly illustrative. In each figure, substantially identical components are denoted by the same reference numerals, and redundant descriptions may be omitted or simplified.

[0010] In the following explanation, axial direction X refers to the direction in which the axis L of the rotation shaft 2 of the gas turbine 1 extends. Furthermore, "front" refers to the side of the gas turbine 1 from which air is introduced from the outside in axial direction X, and "rear" refers to the side of the gas turbine 1 from which exhaust gas is discharged in axial direction X. Axial direction X is the front-to-back direction of the gas turbine 1.

[0011] Figure 1 is a cross-sectional view showing an example of the configuration of a gas turbine 1 according to an embodiment. As shown in Figure 1, in this embodiment, the gas turbine 1 is a twin-shaft gas turbine. The gas turbine 1 is used as an engine for aircraft such as unmanned aerial vehicles, but the application of the gas turbine 1 is not limited to aircraft. The gas turbine 1 can be used as a turbofan engine.

[0012] The gas turbine 1 comprises a rotating shaft 2, a fan 3, a compressor 4, a combustor 5, a turbine 6, a generator 7, and a casing 8 which is the housing. The fan 3 is connected to the front of the rotating shaft 2 and rotates together with the rotating shaft 2. The compressor 4, combustor 5, and turbine 6 are arranged in this order from front to rear along the rotating shaft 2. The casing 8 houses all or part of the rotating shaft 2, fan 3, compressor 4, combustor 5, turbine 6, and generator 7.

[0013] In this embodiment, the rotating shaft 2 includes a low-pressure shaft 2A and a high-pressure shaft 2B extending in the axial direction X. The high-pressure shaft 2B is arranged on the same axis as the low-pressure shaft 2A and is rotatable relative to the low-pressure shaft 2A. The high-pressure shaft 2B is a tubular hollow shaft. The low-pressure shaft 2A is inserted into the hollow space of the high-pressure shaft 2B and penetrates the hollow space. The low-pressure shaft 2A is longer in the front-rear direction than the high-pressure shaft 2B, and the front end 2Aa and rear end 2Ab of the low-pressure shaft 2A are exposed to the outside from the front end 2Ba and rear end 2Bb of the high-pressure shaft 2B, respectively. The front end 2Aa of the low-pressure shaft 2A is connected to the fan 3.

[0014] The compressor 4 includes a low-pressure side compressor 4A and a high-pressure side compressor 4B located behind the low-pressure side compressor 4A. The low-pressure side compressor 4A is an axial flow compressor and includes rotor blades connected to rotate integrally with the low-pressure shaft 2A. In this embodiment, the low-pressure side compressor 4A includes two rotor blades aligned in the axial direction X. The connection between the two rotor blades of the low-pressure side compressor 4A and the low-pressure shaft 2A is located between the front end 2Aa of the low-pressure shaft 2A and the front end 2Ba of the high-pressure shaft 2B. In this embodiment, the two rotor blades of the low-pressure side compressor 4A are connected to the front end 2Aa of the low-pressure shaft 2A together with the fan 3, although they may be connected to the low-pressure shaft 2A at a different position from the fan 3, further rearward from the front end 2Aa.

[0015] The high-pressure side compressor 4B is a centrifugal compressor and includes a rotor connected to the high-pressure shaft 2B so as to rotate integrally with it. In this embodiment, the high-pressure side compressor 4B includes one rotor. The connection between the rotor of the high-pressure side compressor 4B and the high-pressure shaft 2B is located in front of the combustor 5. The types of low-pressure side compressor 4A and high-pressure side compressor 4B are not limited to axial flow compressors and centrifugal compressors. A diffuser 12 is arranged on the outer circumference of the high-pressure side compressor 4B to send the air flowing out of the high-pressure side compressor 4B to the rear. Behind the diffuser 12 is the combustor 5. The combustor 5 is a back-flow type combustor.

[0016] The turbine 6 includes a high-pressure-side turbine 6B and a low-pressure-side turbine 6A disposed behind the high-pressure-side turbine 6B. The low-pressure shaft 2A mechanically connects the low-pressure-side compressor 4A to the low-pressure-side turbine 6A. The high-pressure shaft 2B mechanically connects the high-pressure-side compressor 4B to the high-pressure-side turbine 6B. The low-pressure-side turbine 6A includes rotor blades connected to rotate integrally with the low-pressure shaft 2A. In this embodiment, the low-pressure-side turbine 6A includes two rotor blades arranged in the axial direction X. The connection portion between the two rotor blades of the low-pressure-side turbine 6A and the low-pressure shaft 2A is located between the rear end portion 2Bb of the high-pressure shaft 2B and the rear end portion 2Ab of the low-pressure shaft 2A. The low-pressure-side turbine 6A can rotate the low-pressure-side compressor 4A and the fan 3 via the low-pressure shaft 2A.

[0017] The high-pressure-side turbine 6B includes rotor blades connected to rotate integrally with the high-pressure shaft 2B. In this embodiment, the high-pressure-side turbine 6B includes one rotor blade. The connection portion between the rotor blade of the high-pressure-side turbine 6B and the high-pressure shaft 2B is located between the high-pressure-side compressor 4B and the rear end portion 2Bb of the high-pressure shaft 2B. The high-pressure-side turbine 6B can rotate the high-pressure-side compressor 4B via the high-pressure shaft 2B.

[0018] The casing 8 includes a cylindrical outer shell 8A and an inner shell 8B arranged concentrically with each other. The inner shell 8B houses the compressor 4, the combustor 5, the turbine 6, and the generator 7. A cylindrical bypass flow path B is formed between the inner shell 8B and the outer shell 8A.

[0019] The gas turbine 1 includes a first cylinder 9 extending in the axial direction X from the fan 3 to the high-pressure-side compressor 4B inside the inner shell 8B. The outer diameter and the inner diameter of the first cylinder 9 decrease from the front to the rear. The first cylinder 9 defines a part of a compressed air flow path R from the low-pressure-side compressor 4A toward the high-pressure-side compressor 4B between the first cylinder 9 and the inner shell 8B. The outer peripheral surface of the first cylinder 9 faces the compressed air flow path R. The generator 7 is disposed inside the first cylinder 9. The first cylinder 9 is connected to the inner shell 8B by a plurality of struts 9A and supported by the inner shell 8B. The rotor blades of the low-pressure-side compressor 4A and the rotor blades of the high-pressure-side compressor 4B are located in the compressed air flow path R.

[0020] The gas turbine 1 includes a second cylinder 10 that extends in the axial direction X from the high-pressure turbine 6B to the low-pressure turbine 6A inside the inner casing 8B. The second cylinder 10 defines at least a part of the gas flow path G that extends rearward from the combustor 5 between the second cylinder 10 and the inner casing 8B inside the inner casing 8B. The outer peripheral surface of the second cylinder 10 faces the gas flow path G. The second cylinder 10 is connected to the inner casing 8B via a plurality of struts 10A etc. and is supported by the inner casing 8B. The gas flow path G merges with the bypass flow path B behind the low-pressure turbine 6A. The rotor blades of the low-pressure turbine 6A and the rotor blades of the high-pressure turbine 6B are located in the gas flow path G.

[0021] The gas turbine 1 includes a strut housing 11. Part or all of the strut housing 11 is housed in the outer casing 8A. The strut housing 11 is located in front of the high-pressure compressor 4B. In this embodiment, the strut housing 11 is located between the generator 7 and the high-pressure compressor 4B in the axial direction X. The strut housing 11 extends in the axial diameter direction, which is the radial direction of the axis L, from the first cylinder 9 to the outer casing 8A. The strut housing 11 is connected to the outer casing 8A, the inner casing 8B, and the first cylinder 9, and connects the outer casing 8A, the inner casing 8B, and the first cylinder 9 to each other.

[0022] The strut housing 11 includes an outer casing portion 11a, an inner casing portion 11b, a cylinder portion 11c, and a plurality of struts 11d. The outer casing portion 11a is connected to the outer casing 8A and forms a part of the outer casing 8A. The outer casing portion 11a has a cylindrical shape that extends in the circumferential direction around the axis L, similar to the outer casing 8A. The inner casing portion 11b is connected to the inner casing 8B and forms a part of the inner casing 8B. The inner casing portion 11b has a cylindrical shape that extends in the circumferential direction, similar to the inner casing 8B. The cylinder portion 11c is connected to the first cylinder 9 and forms a part of the first cylinder 9. The cylinder portion 11c has a cylindrical shape that extends in the circumferential direction, similar to the first cylinder 9. The plurality of struts 11d extend radially in the axial diameter direction from the cylinder portion 11c through the inner casing portion 11b to the outer casing portion 11a. Each of the plurality of struts 11d connects the outer casing portion 11a, the inner casing portion 11b, and the cylinder portion 11c to each other.

[0023] A portion of the air drawn in by fan 3 flows through bypass channel B and is discharged to the rear. The remaining air drawn in by fan 3 flows through compressed air channel R and enters the low-pressure compressor 4A. The air passes sequentially through the low-pressure compressor 4A and the high-pressure compressor 4B within the compressed air channel R and enters the combustor 5 via the diffuser 12. The combustion gas discharged from the outlet of the combustor 5 passes through the nozzle unit 13 and enters the gas channel G. The combustion gas passes sequentially through the high-pressure turbine 6B and the low-pressure turbine 6A within the gas channel G and is discharged to the rear. The combustion gas discharged from gas channel G merges with the air discharged from bypass channel B, is accelerated by the air, and is discharged to the outside of the casing 8.

[0024] The high-pressure side turbine 6B rotates under the influence of the high-temperature, high-pressure combustion gas flow immediately after it flows out of the combustor 5. The low-pressure side turbine 6A rotates under the influence of the combustion gas flow that has been cooled and depressurized as it passes through the high-pressure side turbine 6B. For this reason, the high-pressure side turbine 6B rotates at a higher rotational speed than the low-pressure side turbine 6A. Furthermore, the high-pressure side compressor 4B, which is rotated by the high-pressure side turbine 6B, rotates at a higher rotational speed than the low-pressure side compressor 4A, which is rotated by the low-pressure side turbine 6A. Rotational speed refers to the number of rotations per unit time. The air flowing through the compressed air passage R is pressurized by the low-pressure side compressor 4A, and then pressurized to an even higher pressure by the high-pressure side compressor 4B before flowing into the combustor 5. Because the high-pressure side compressor 4B is affected by the heat generated in the combustor 5, it is exposed to a higher temperature and pressure environment than the low-pressure side compressor 4A.

[0025] Figure 2 is an enlarged cross-sectional view showing the structure from the low-pressure side compressor 4A to the high-pressure side compressor 4B in Figure 1. As shown in Figure 2, the generator 7 generates electricity when the generator shaft 7A of the generator 7 is driven by the rotational driving force of the rotating shaft 2. In this embodiment, the generator shaft 7A is located coaxially with the low-pressure shaft 2A and the high-pressure shaft 2B. The generator 7 may also have a starter function that rotates the rotating shaft 2 when the gas turbine 1 is started. In this case, the generator 7 is a motor generator. The generator 7 is located inside the first cylinder 9 and in front of the high-pressure side compressor 4B. In this embodiment, the generator 7 is located between the low-pressure side compressor 4A and the high-pressure side compressor 4B.

[0026] The generator 7 includes a generator shaft 7A, a rotor 7B that rotates integrally with the generator shaft 7A, a stator 7C located around the rotor 7B, and a generator housing 7D. The generator shaft 7A and rotor 7B are located inside the stator 7C. The generator shaft 7A is a tubular hollow shaft extending in the axial direction X. The low-pressure shaft 2A is inserted into and penetrates the hollow space of the generator shaft 7A. The front end 2Ba of the high-pressure shaft 2B is inserted into the hollow space of the generator shaft 7A. The rear end 7Ab of the generator shaft 7A is connected to the front end 2Ba of the high-pressure shaft 2B to transmit rotational forces around axis L. The generator shaft 7A rotates together with the high-pressure shaft 2B around axis L.

[0027] In this embodiment, the rear end portion 7Ab of the generator shaft 7A and the front end portion 2Ba of the high-voltage shaft 2B are spline-connected. The inner circumferential surface of the rear end portion 7Ab of the generator shaft 7A includes a plurality of grooves spaced apart in the circumferential direction and extending in the axial direction X, which function as an internal spline. The outer circumferential surface of the front end portion 2Ba of the high-voltage shaft 2B includes a plurality of band-shaped projections spaced apart in the circumferential direction and extending in the axial direction X, which function as an external spline.

[0028] The rotor 7B is a cylindrical body having an internal space extending in the axial direction X. The generator shaft 7A is inserted into and passes through the internal space of the rotor 7B. The rotor 7B is coupled to the generator shaft 7A and rotates together with the generator shaft 7A around the axis L. The rotor 7B contains permanent magnets, and the stator 7C contains windings. The rotor 7B is surrounded by the stator 7C. Therefore, the generator 7 is of the permanent magnet type.

[0029] The generator housing 7D houses the rotor 7B and the stator 7C. The generator housing 7D covers the rotor 7B and the stator 7C from at least the outside in the radial direction. The generator housing 7D may also cover the rotor 7B and the stator 7C from both sides in the axial direction X.

[0030] As shown in Figure 1, the gas turbine 1 comprises a plurality of bearings 20 and a bearing housing 30 that supports the bearings 20. The bearings 20 include a low-pressure bearing 20A, a high-pressure bearing 20B, and a generator bearing 20C. The low-pressure bearing 20A rotatably supports the low-pressure shaft 2A, the high-pressure bearing 20B rotatably supports the high-pressure shaft 2B, and the generator bearing 20C rotatably supports the generator shaft 7A. In this embodiment, the low-pressure bearing 20A, the high-pressure bearing 20B, and the generator bearing 20C are radial bearings, for example, radial ball bearings or radial roller bearings.

[0031] As shown in Figure 2, the low-pressure bearing 20A includes a first low-pressure bearing 20Aa and a second low-pressure bearing 20Ab located at the front of the low-pressure shaft 2A, and a third low-pressure bearing 20Ac located at the rear of the low-pressure shaft 2A. The third low-pressure bearing 20Ac is shown in Figure 1. In this embodiment, the first low-pressure bearing 20Aa and the second low-pressure bearing 20Ab are located between the front end 2Aa of the low-pressure shaft 2A and the front end 7Aa of the generator shaft 7A. The second low-pressure bearing 20Ab is located behind the first low-pressure bearing 20Aa. The third low-pressure bearing 20Ac is located between the connection portion between the low-pressure shaft 2A and the low-pressure side turbine 6A and the rear end 2Bb of the high-pressure shaft 2B.

[0032] The high-pressure bearing 20B includes a first high-pressure bearing 20Ba located at the front of the high-pressure shaft 2B and a second high-pressure bearing 20Bb located at the rear of the high-pressure shaft 2B. The second high-pressure bearing 20Bb is shown in Figure 1. In this embodiment, the first high-pressure bearing 20Ba is located between the rear end 7Ab of the generator shaft 7A and the connection portion between the high-pressure side compressor 4B and the high-pressure shaft 2B. The second high-pressure bearing 20Bb is located between the connection portion between the high-pressure side turbine 6B and the high-pressure shaft 2B and the rear end 2Bb of the high-pressure shaft 2B.

[0033] The generator bearing 20C includes a first generator bearing 20Ca located at the front of the generator shaft 7A and a second generator bearing 20Cb located at the rear of the generator shaft 7A. The first generator bearing 20Ca is located in front of the rotor 7B, and the second generator bearing 20Cb is located behind the rotor 7B. In this embodiment, the first generator bearing 20Ca is located between the second low-pressure bearing 20Ab and the rotor 7B, and the second generator bearing 20Cb is located between the rotor 7B and the first high-pressure bearing 20Ba. The generator bearings 20Ca and 20Cb are fixed to the inner surface of the generator housing 7D and supported by the generator housing 7D from the radially outer side.

[0034] The bearing housing 30 includes a first bearing housing 30A and a second bearing housing 30B located aft of the first bearing housing 30A in the axial direction X. The second bearing housing 30B is shown in Figure 1. The first bearing housing 30A extends in the axial direction X from the first low-pressure bearing 20Aa to the first high-pressure bearing 20Ba. The first bearing housing 30A extends in the circumferential direction and surrounds the first low-pressure bearing 20Aa, the second low-pressure bearing 20Ab, the first high-pressure bearing 20Ba and the generator 7 from the radially outer side.

[0035] The first low-pressure bearing 20Aa, the second low-pressure bearing 20Ab, and the first high-pressure bearing 20Ba are fixed to the inner surface of the first bearing housing 30A and supported by the first bearing housing 30A from the radially outer side. The generator housing 7D is fixed to the first bearing housing 30A and supported by the first bearing housing 30A in the axial X direction and the radially outer direction. The first bearing housing 30A is connected to the first cylindrical body 9 by a plurality of struts 30Aa and is supported by the first cylindrical body 9. The rear of the first bearing housing 30A is connected to the cylindrical portion 11c of the strut housing 11.

[0036] As shown in Figure 1, the second bearing housing 30B extends axially X from the second high-pressure bearing 20Bb to the third low-pressure bearing 20Ac. The second bearing housing 30B extends circumferentially and surrounds the second high-pressure bearing 20Bb and the third low-pressure bearing 20Ac from the radially outer side. The second high-pressure bearing 20Bb and the third low-pressure bearing 20Ac are fixed to the inner surface of the second bearing housing 30B and supported by the second bearing housing 30B from the radially outer side. The second bearing housing 30B is connected to the second cylindrical body 10 by a plurality of struts and is supported by the second cylindrical body 10.

[0037] Figure 3 is an enlarged cross-sectional view of the generator 7 shown in Figure 2. As shown in Figure 3, the stator 7C includes a cylindrical core 7Ca located around the rotor 7B and containing a magnetic material. The core 7Ca has a plurality of teeth 7Cb arranged in an annular pattern on its inner surface, spaced apart from each other in the circumferential direction of the core 7Ca. The stator 7C includes a conductive winding 7Cc wound around the plurality of teeth 7Cb.

[0038] The conductors extending from the windings 7Cc of multiple teeth 7Cb are bundled in front of the stator 7C. Specifically, conductors of the same phase are connected and bundled together. In this embodiment, the generator 7 is a three-phase AC generator. Therefore, the conductors corresponding to the U phase, V phase, and W phase are bundled into three conductor bundles 7Cca. The three conductor bundles 7Cca are covered with an electrical insulating material.

[0039] The three wire bundles 7Cca extend circumferentially within the generator housing 7D and are then drawn out through the exit holes 7Db in the side wall 7Da of the generator housing 7D, into the outside of the generator housing 7D and into the first cylindrical body 9. In this embodiment, the three wire bundles 7Cca extend circumferentially near the front end wall 7Dc of the generator housing 7D. The end wall 7Dc is a wall that extends radially in a position forward of the core 7Ca. The generator housing 7D includes a housing projection 7Dd that extends rearward from the end wall 7Dc. The housing projection 7Dd also extends circumferentially. The three wire bundles 7Cca are located radially outside the housing projection 7Dd and are prevented from moving radially inward by the housing projection 7Dd. This prevents the wire bundles 7Cca from coming into contact with the rotating parts inside the generator 7.

[0040] In this embodiment, each wire bundle 7Cca is processed to have a cable structure in the process of extending in the circumferential direction to the exit hole 7Db in the side wall 7Da. Therefore, the three wire bundles 7Cca constitute at least three electrical cables in the region from the exit hole 7Db in the side wall 7Da to the outside of the generator housing 7D. For this reason, in the specification, "wire bundle 7Cca" may be referred to as "cable 7E". Cable 7E is an example of a generator wire.

[0041] The ends of three cables 7E extending outside the generator housing 7D are connected to a generator connector 7F. The generator connector 7F is located outside the generator housing 7D and inside the first cylindrical body 9. In this embodiment, the generator connector 7F is not fixed to any component of the gas turbine 1. However, the generator connector 7F may be fixed to, for example, the generator housing 7D or the strut housing 11. The generator connector 7F is connected to a first external connector 101 of an external wire 100 extending from outside to inside the gas turbine 1. The first external connector 101 is located at the end of the external wire 100 inside the gas turbine 1. The generator connector 7F and the first external connector 101 are physically and electrically connected to each other. The generator connector 7F and the first external connector 101 are examples of connection points between the external wire and the generator wire.

[0042] The generator connector 7F and the first external connector 101 are connected inside the inner shell 8B, specifically inside the first cylindrical body 9. In this embodiment, the generator connector 7F and the first external connector 101 are connected at or near the connection portion C between the first bearing housing 30A and the cylindrical portion 11c of the strut housing 11.

[0043] At the connection point between the generator connector 7F and the first external connector 101, either or both of the conductors of the generator connector 7F and the first external connector 101 may be exposed. Therefore, corona discharge may occur between the two conductors of the generator connector 7F and the first external connector 101.

[0044] In this embodiment, the gas turbine 1 is mounted on an aircraft. During aircraft flight, the atmospheric pressure around the aircraft decreases. Conductors exposed to a low-pressure environment are prone to generating corona discharge. For example, one possible measure to prevent corona discharge is to increase the distance between two conductors, but connectors containing such conductors become large and may not fit within a limited space.

[0045] On the other hand, in this embodiment, the generator connector 7F and the first external connector 101 are connected inside the first cylindrical body 9, that is, inside the inner shell 8B. The air pressure inside the inner shell 8B remains higher than the air pressure outside the gas turbine 1 during aircraft flight. Therefore, corona discharge between the conductors of the generator connector 7F and the first external connector 101 is relatively unlikely to occur. This makes it possible to miniaturize the generator connector 7F and the first external connector 101.

[0046] The strut housing 11 includes a hollow passage 11e that extends through the strut housing 11. The first bearing housing 30A includes a wire hole 30Ab that penetrates the wall of the first bearing housing 30A. The wire hole 30Ab opens on the outer surface at a position corresponding to the connection portion C and on the inner surface, communicating the hollow passage 11e with the internal space of the first bearing housing 30A. In this embodiment, the wire hole 30Ab extends in the axial direction X and is located radially outward from the generator housing 7D. The first external connector 101 is connected to the generator connector 7F while being located either in the wire hole 30Ab or adjacent to the wire hole 30Ab. The connection location of the generator connector 7F and the first external connector 101 may be any of the wire hole 30Ab, the interior of the first bearing housing 30A, or the hollow passage 11e. As a result, the generator connector 7F and the first external connector 101 are protected by the first bearing housing 30A and the strut housing 11.

[0047] The connection points of the generator connector 7F and the first external connector 101 in the axial direction X are located in front of the strut 11d of the strut housing 11. As a result, the generator connector 7F and the first external connector 101 are located in the region opposite to the combustor 5 with respect to the strut housing 11, thereby reducing the impact of the heat generated by the combustor 5.

[0048] As shown in Figure 2, the hollow passage 11e extends through the outer shell portion 11a, the inner shell portion 11b, the cylindrical portion 11c, and the strut 11d. In this embodiment, the hollow passage 11e extends inward in the radial direction from the outer shell portion 11a, then changes direction and extends forward in the axial direction X through the cylindrical portion 11c. The hollow passage 11e opens at a position on the cylindrical portion 11c corresponding to the connection portion C and on the outer surface of the outer shell portion 11a.

[0049] The external wire 100 includes a first wire portion 102 located outside the outer shell portion 11a, a second wire portion 103 located inside the outer shell portion 11a, and a relay connector 104 connecting the first wire portion 102 and the second wire portion 103. The external wire 100 also includes a second external connector 105 connected to the end of the first wire portion 102 outside the outer shell portion 11a. For example, the second external connector 105 may be connected to an electric auxiliary device that is provided on the gas turbine 1 and consumes power. The relay connector 104 is located where the external wire 100 penetrates the outer shell portion 11a and is fixed to the outer shell portion 11a. The relay connector 104 is located where the hollow passage 11e penetrates the outer shell portion 11a.

[0050] The method of fixing the relay connector 104 is not particularly limited. Examples of fixing methods include engagement, mating, bonding, welding, fixing with fasteners, and integral molding. Examples of engagement may include protrusion engagement, snap engagement, and screw engagement. Examples of mating may include press-fit and shrink-fit. Examples of fasteners may include bolts and rivets. In this embodiment, since the strut housing 11 is made of metal and the outer shell of the relay connector 104 is made of resin, the fixing method can be any method that can fix the resin member to the metal member. The external wires 100 are handled in a state where they are attached to the strut housing 11 in advance before the assembly of the gas turbine 1.

[0051] For example, in the manufacturing process of the gas turbine 1 according to this embodiment, the low-pressure shaft 2A and the high-pressure shaft 2B are assembled, and then the generator 7 assembly, in which the generator connector 7F is drawn out to the outside of the generator housing 7D, is assembled by connecting the generator shaft 7A and the high-pressure shaft 2B. Furthermore, the bearing 20 and the bearing housing 30 are assembled, and the strut housing 11, in which the external wires 100 are pre-attached, is assembled to the bearing housing 30. At this time, the external connectors 101 and 105 are exposed to the outside of the hollow passage 11e. When assembling the strut housing 11, the first external connector 101 is connected to the generator connector 7F. In parallel with or before or after the assembly of the strut housing 11, the first cylindrical body 9, the inner shell 8B, and the outer shell 8A are assembled. The installation of the external power lines 100 does not require routing the first power line section 102 and the intermediate connector 104 through the strut 11d; it is sufficient to connect the first external connector 101 to the generator connector 7F. Therefore, the assembly of the gas turbine 1 is simplified.

[0052] The configuration of the lead-out hole 7Db in the side wall 7Da of the generator housing 7D will be described. Figure 4 is a view of the lead-out hole 7Db in the side wall 7Da of the generator housing 7D shown in Figure 3, viewed from the radially outward direction of axis L. As shown in Figure 4, the lead-out hole 7Db extends in the axial direction X and the circumferential direction LR centered on axis L. The width of the lead-out hole 7Db in the circumferential direction LR is greater than the width of the lead-out hole 7Db in the axial direction X. In this embodiment, the width of the lead-out hole 7Db in the circumferential direction LR is greater than or equal to the total width of three cables 7E arranged in a line in the circumferential direction LR. The width of the lead-out hole 7Db in the axial direction X is greater than or equal to the width of one cable 7E. Therefore, three cables 7E can be passed through the lead-out hole 7Db while arranged in a line in the circumferential direction LR.

[0053] Furthermore, the inner edge 7Dba of the outlet hole 7Db includes a plurality of protrusions 7Dbb projecting in the axial direction X. The number of protrusions 7Dbb corresponds to the number of cables 7E, which in this embodiment is three. The inner edge 7Dba is the inner edge located in the direction in which the cables 7E drawn out from the outlet hole 7Db extend, and in this embodiment, it is the inner edge at the rear of the outlet hole 7Db. The protrusions 7Dbb deform the inner edge 7Dba, making the width of the outlet hole 7Db in the axial direction X at the protrusions 7Dbb larger than the width of the outlet hole 7Db in the axial direction X at the portion adjacent to the protrusions 7Dbb in the circumferential direction LR. As a result, the cables 7E passing through the outlet hole 7Db are positioned in the circumferential direction LR by being contained within the protrusions 7Dbb. Thus, the positioning of the three cables 7E within the outlet hole 7Db becomes easier.

[0054] Figure 5 is a view of the generator housing 7D of Figure 4, with the partitioning member 7G attached to the outlet hole 7Db, from the axial radial direction outward along the axis L. As shown in Figure 5, the generator 7 includes a partitioning member 7G that is detachable from the generator housing 7D. The partitioning member 7G is attached to the side wall 7Da of the generator housing 7D so as to overlap with the outlet hole 7Db in the axial radial direction.

[0055] As shown in Figure 4, in this embodiment, the generator housing 7D includes two screw holes 7De on both sides of the axial direction of the extraction hole 7Db. As shown in Figure 5, the partition member 7G includes two through holes 7Ga at positions corresponding to the two screw holes 7De. The partition member 7G is attached to the generator housing 7D by screwing two bolts 7Gb through the two through holes 7Ga into the two screw holes 7De.

[0056] The method of fixing the partition member 7G is not limited to bolt fixing. Examples of fixing methods may include engagement, fitting, bonding, welding, and fixing using other fasteners. Examples of engagement may include protrusion engagement and snap engagement. Examples of fitting may include press-fit and shrink fitting. Examples of fasteners may include rivets. In this embodiment, since the generator housing 7D and the partition member 7G are made of metal, the fixing method can be any method that can fix metal members together.

[0057] The partitioning member 7G, when attached to the generator housing 7D, has a shape that divides the lead hole 7Db in the circumferential direction LR into three partitioning holes 7Dbc corresponding to the three cables 7E that pass through the lead hole 7Db.

[0058] The partitioning member 7G includes a plurality of protrusions 7Gc that are spaced apart from each other and arranged in the circumferential direction LR when the partitioning member 7G is attached to the generator housing 7D. In this embodiment, there are four protrusions 7Gc, which project backward in the axial direction X. The four protrusions 7Gc divide into three partition holes 7Dbc, which correspond to three cables 7E that pass through the lead-out holes 7Db.

[0059] When the partitioning member 7G is attached to the generator housing 7D, the positions of the four protrusions 7Gc in the circumferential direction LR correspond to positions adjacent to the protrusions 7Dbb of the extraction hole 7Db. As a result, the four protrusions 7Gc partition the extraction hole 7Db into three partitioning holes 7Dbc at positions corresponding to the three protrusions 7Dbb. Furthermore, the rear ends of the four protrusions 7Gc in the axial direction X are located at the same position as or further rear than the rear end of the protrusions 7Dbb of the extraction hole 7Db in the axial direction X. As a result, the four protrusions 7Gc partition the extraction hole 7Db up to the rear end of the protrusions 7Dbb in the axial direction X.

[0060] The partitioning member 7G is then attached to the generator housing 7D such that each of the three cables 7E extends from the inside to the outside of the generator housing 7D through the corresponding partitioning hole 7Dbc.

[0061] Therefore, after the three cables 7E are pulled out through the extraction hole 7Db, they are positioned by the protrusions 7Dbb of the extraction hole 7Db. Subsequently, the partitioning member 7G is attached to the generator housing 7D. As a result, the four projections 7Gc of the partitioning member 7G position and fix the three cables 7E in the circumferential direction LR and the axial direction X within the extraction hole 7Db, preventing the cables 7E from contacting each other in the extraction hole 7Db. Thus, the extraction and protection of the cables 7E is facilitated.

[0062] In this embodiment, the partitioning member 7G has a flat plate shape. Therefore, as shown in Figure 4, the generator housing 7D integrally includes a base 7Df that forms a flat receiving surface around the outlet hole 7Db. As a result, the three cables 7E extend in the same direction from the outlet hole 7Db, making it easy to pull out the cables 7E. The partitioning member 7G may also have a curved plate shape along the axial direction LR on the side wall 7Da of the generator housing 7D.

[0063] While exemplary embodiments of the present disclosure have been described above, the disclosure is not limited to these embodiments. That is, various modifications and improvements are possible within the scope of the disclosure. For example, embodiments that have been modified in various ways, and forms constructed by combining components from different embodiments, are also included within the scope of the disclosure.

[0064] For example, in the gas turbine 1 according to this embodiment, the structure of the external wires 100 corresponds to the three cables 7E of the generator 7, but the number of wires that the structure corresponds to may be two or four or more. For example, the structure of the external wires 100 may correspond to two or more cables 7E, or to a combination of one or more cables 7E and one or more signal lines. The generator 7 may include one or more sensors, including a rotation sensor. For this reason, a signal line extending from the sensor may be drawn out from inside the generator housing 7D to the outside and connected to the external wires 100.

[0065] The gas turbine 1 according to this embodiment includes a strut housing 11 located between the generator 7 and the high-pressure side compressor 4B, but the structure of the strut housing is not limited thereto. For example, the gas turbine 1 may, instead of or in addition to the strut housing 11, include a housing containing struts between the low-pressure side compressor 4A and the generator 7, or at the location of the generator 7, and external power lines 100 may be installed in the housing. For example, the gas turbine 1 may, instead of or in addition to the strut housing 11, include a housing containing struts at the location of the second bearing housing 30B, or in front of or behind the second bearing housing 30B, and external power lines 100 may be installed in the housing.

[0066] In the gas turbine 1 according to this embodiment, the strut housing 11 is a single component, but it may be divisible into multiple components. The components constituting the strut housing 11 may include one or more of the outer shell portion 11a, inner shell portion 11b, cylindrical portion 11c, and strut 11d.

[0067] In the gas turbine 1 according to this embodiment, the generator 7 has an inner rotor type structure in which the rotor 7B is located inside the stator 7C, but it may also have an outer rotor type structure in which the rotor surrounds the stator. Even with such a structure, the rotor can be connected to rotate integrally with the hollow generator shaft 7A.

[0068] The gas turbine 1 according to this embodiment is a twin-shaft gas turbine in which the rotating shaft 2 includes two shafts, a low-pressure shaft 2A and a high-pressure shaft 2B. However, it may also be a single-shaft gas turbine in which the rotating shaft 2 includes only one shaft. In this case, the single-shaft gas turbine may have a structure in which a part or all of the inner circumferential surface of the generator shaft 7A engages with a part of the outer circumferential surface of the rotating shaft 2, or a structure in which a part or all of the outer circumferential surface of the generator shaft 7A engages with a part of the inner circumferential surface of the rotating shaft 2. Alternatively, the generator shaft 7A and the rotating shaft 2 may be a single continuous shaft.

[0069] The structure of the gas turbine 1 according to this embodiment is such that the front end 2Ba of the high-pressure shaft 2B is inserted into the internal space of the rear end 7Ab of the generator shaft 7A, but is not limited thereto. For example, the gas turbine 1 may have a structure in which the rear end 7Ab of the generator shaft 7A is inserted into the internal space of the front end 2Ba of the high-pressure shaft 2B. For example, the high-pressure shaft 2B and the generator shaft 7A may be a single continuous shaft. The components of the generator 7 may then be assembled to this shaft.

[0070] Examples of each aspect of the technology of this disclosure are given below. A gas turbine according to the first aspect of this disclosure comprises a housing including an outer shell of the gas turbine, an inner shell located inside the outer shell, and struts extending in a direction intersecting the axial direction of the gas turbine and connecting the outer shell and the inner shell; a generator located inside the inner shell, including generator wires extending to the outside of the generator; and external wires extending through the outer shell from the outside to the inside and through the struts, which are connected to the generator wires, wherein the connection portion between the external wires and the generator wires is located inside the inner shell.

[0071] According to the first embodiment, the external wires can be assembled to the gas turbine together with the struts, and the generator wires can be assembled to the gas turbine together with the generator. After assembly, the external wires can be connected to the generator wires inside the inner shell. This makes the work of installing the external wires, installing the generator wires, and connecting the external wires and generator wires easier during the gas turbine assembly process. Thus, the assembly of the gas turbine becomes easier.

[0072] A gas turbine according to a second aspect of the present disclosure may, in the first aspect, further include a combustor located inside the outer shell behind the struts in the axial direction and burning a mixture of air and fuel, wherein the connection portion between the external wires and the generator wires is located in front of the struts in the axial direction.

[0073] According to the second embodiment, the connection point between the external wire and the generator wire is located in the area opposite the combustor with respect to the strut, thereby reducing the influence of heat generated by the combustor.

[0074] A gas turbine according to a third aspect of the present disclosure may, in the first or second aspect, include an external wire comprising a first wire portion located outside the outer shell, a second wire portion located inside the outer shell, and a relay connector connecting the first wire portion and the second wire portion, wherein the relay connector is located at the portion where the external wire penetrates the outer shell and is fixed to the outer shell.

[0075] According to the third embodiment, since the relay connector penetrates the outer shell and is fixed to the outer shell, the load on the wire portion is reduced. Therefore, the power transmission of the external wire is stabilized.

[0076] A gas turbine according to a fourth aspect of the present disclosure may be configured such that, in any one of the first to third aspects, the housing includes a hollow passage extending through the outer shell, the struts, and the inner shell, and the external wires extend through the hollow passage.

[0077] According to the fourth embodiment, the constraints on the external wires from the struts are reduced, and the degree of freedom of the external wires is improved. This makes the connection work between the external wires and the generator wires easier. Furthermore, even if the struts and external wires expand or contract at different expansion or contraction rates, the influence on the external wires from the struts is reduced. This stabilizes the power transmission of the external wires.

[0078] A gas turbine according to a fifth aspect of the present disclosure may be configured such that, in any one of the first to fourth aspects, the generator wire includes a generator connector at its end, and the external wire includes an external connector at an end located inside the outer shell that is connected to the generator connector, and the location where the external connector and the generator connector are connected is inside the inner shell.

[0079] According to the fifth embodiment, the external connector can be connected to the generator connector within the internal space of the inner shell. Since the external connector and the generator connector are protected by the inner shell, no protective structure is required.

[0080] A gas turbine according to a sixth aspect of the present disclosure, in any one of the first to fifth aspects, the generator may include a rotor, a stator located around the rotor and including windings, a housing housing the rotor and the stator, and a plurality of generator wires extending from the windings, wherein the housing includes an elongated hole that penetrates the housing and through which the plurality of generator wires pass, the elongated hole extending in the axial direction and in the circumferential direction of the axis, and the width of the elongated hole in the circumferential direction is greater than the width of the elongated hole in the axial direction.

[0081] According to the sixth embodiment, in the generator assembly process, multiple generator wires are drawn out from the inside to the outside of the housing through a hole that penetrates the housing. Since this hole is an elongated hole extending in the circumferential direction, the multiple generator wires can be arranged in a circumferential alignment within the elongated hole. This reduces interference between generator wires due to overlapping, etc., and interference between generator wires and the periphery of the elongated hole. Therefore, the work of drawing the generator wires out from the inside to the outside of the generator can be made easier while suppressing the physical load on the generator wires.

[0082] A gas turbine according to a seventh aspect of the present disclosure, in a sixth aspect, the generator may include a partitioning member that is detachable from the housing and, when attached to the housing, partitions the elongated hole in the circumferential direction into a plurality of partitioning holes corresponding to the plurality of generator wires, wherein the partitioning member is attached to the housing such that each of the plurality of generator wires extends from the inside to the outside of the housing through the corresponding partitioning hole.

[0083] According to the seventh embodiment, after multiple generator wires are drawn out, a partitioning member is attached to the housing, so that each generator wire is positioned and fixed in the partitioned holes partitioned by the partitioning member. Interference between generator wires due to overlapping or the like can be prevented by the partitioning member. Therefore, the physical load on the generator wires can be reduced.

[0084] All ordinal numbers, quantities, and other figures used herein are illustrative to illustrate the technology of this disclosure, and this disclosure is not limited to such illustrative figures. The connections between components are illustrative to illustrate the technology of this disclosure, and the connections that realize the functions of this disclosure are not limited to these.

[0085] This disclosure can be implemented in various ways without departing from the scope of its essential features, and the scope of this disclosure is defined more by the appended claims than by the description in the specification; therefore, exemplary embodiments and modifications are illustrative and not limiting. All modifications within the claims and their scope, or equivalents within the claims and their scope, are intended to be encompassed by the claims. [Explanation of Symbols]

[0086] 1 Gas turbine, 5 Combustor, 6 Turbine, 7 Generator, 7B Rotor, 7C Stator, 7Cc Winding, 7Cca Wire bundle, 7D Generator housing, 7Db Outlet hole, 7Dbc Partition hole, 7E Cable, 7F Generator connector, 7G Partitioning member, 8 Casing, 8A Outer shell, 8B Inner shell, 11 Strut housing, 11a Outer shell section, 11b Inner shell section, 11d Strut, 11e Hollow passage, 100 External wire, 101 First external connector, 102 First wire section, 103 Second wire section, 104 Intermediate connector.

Claims

1. It is a gas turbine, A housing comprising the outer shell of the gas turbine, an inner shell located inside the outer shell, and struts extending in a direction intersecting the axial direction of the gas turbine and connecting the outer shell and the inner shell, A generator located inside the inner shell, including a generator wire extending to the outside of the generator, An external wire extending through the outer shell from the outside to the inside and passing through the strut, which is connected to the generator wire, The connection portion between the external wire and the generator wire is located inside the inner shell. The generator wire includes a generator connector at its end. The external wire includes an external connector at the end located inside the outer shell, which is connected to the generator connector. The location where the external connector and the generator connector are connected is inside the inner shell. One or both of the external connector and the generator connector are not fixed to the components of the gas turbine. Gas turbine.

2. The outer shell further comprises a combustor located behind the strut in the axial direction and burning a mixture of air and fuel, The connection portion between the external wire and the generator wire is located in front of the strut in the axial direction. The gas turbine according to claim 1.

3. The aforementioned external wire is, The first wire portion located outside the outer shell, The second wire portion located inside the outer shell, It includes a relay connector that connects the first wire portion and the second wire portion, The relay connector is located at the point where the external wire penetrates the outer shell and is fixed to the outer shell. The gas turbine according to claim 1.

4. The housing includes a hollow passage extending through the outer shell, the struts, and the inner shell, The aforementioned external wire extends through the aforementioned hollow passage. The gas turbine according to claim 1.

5. The generator includes a rotor, a stator located around the rotor and including windings, a housing that accommodates the rotor and the stator, and a plurality of generator wires extending from the windings. The housing includes an elongated hole that penetrates the housing and through which the plurality of generator wires pass, The aforementioned elongated hole extends in the axial direction and in the circumferential direction of the axis, The width of the elongated hole in the circumferential direction is greater than the width of the elongated hole in the axial direction. The gas turbine according to claim 1.

6. The generator includes a partitioning member that is detachable from the housing, and which, when attached to the housing, divides the elongated hole in the circumferential direction into a plurality of partitioning holes corresponding to the plurality of generator wires. The partitioning member is attached to the housing such that each of the multiple generator wires extends from the inside to the outside of the housing through the corresponding partitioning hole. The gas turbine according to claim 5.

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