Gas turbine generator

Abstract

To improve the ease of separating the gas turbine unit and the generator unit in a gas turbine generator. [Solution] The second shaft portion 60 of the rotating shaft 60 of the gas turbine is inserted through the hollow portion 62A of the hollow shaft 62, the generator rotor 62 is attached to the hollow shaft 62, the hollow shaft 62 and the second shaft portion 60 are connected by a first spline 59, the hollow shaft 62 is sandwiched between a first nut 77 screw-connected to the end of the second shaft portion 60 and the flange 60C of the rotating shaft 60, and the hollow shaft 62 is fixed to the second shaft portion 60 so that it can be inserted and removed.

Description

Technical Field

[0001] The present invention relates to a gas turbine generator.

Background Art

[0002] A hybrid power system is known in which a gas turbine engine and a rotating electrical machine are connected, and an output shaft of the gas turbine engine and a rotor shaft of the rotating electrical machine are coaxially coupled to each other (for example, Patent Document 1).

[0003] In this hybrid power system, the rotor shaft of the rotating electrical machine is constituted by a hollow shaft, and a solid shaft that is disposed in the hollow portion of the hollow shaft and rotates integrally with the hollow shaft. The hollow shaft is rotatably supported by a housing of the rotating electrical machine, and its axial movement relative to the housing is restricted by screwing of a nut member or the like. A compressor wheel is splined to the output shaft of the gas turbine engine, and the compressor wheel is splined to the hollow shaft. In the hollow portion of the hollow shaft, the solid shaft and the output shaft are screw-coupled to each other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of Invention

Problems to be Solved by the Invention

[0005] In the above conventional art, in order to separate the gas turbine engine and the rotating electrical machine at the time of maintenance or the like, it is necessary to release the restriction on the axial movement of the hollow shaft relative to the housing by removing the nut member, and to relatively rotate the solid shaft and the output shaft to release the screw coupling between the solid shaft and the output shaft. For this reason, the workability of separating the gas turbine engine and the rotating electrical machine and the workability of recoupling them are poor.

[0006] In view of the above background, the present invention aims to improve the workability of separating the gas turbine device portion and the generator portion during maintenance of a gas turbine generator. [Means for solving the problem]

[0007] To solve the above problems, one aspect of the present invention provides a turbine housing that defines a compressor chamber and a turbine chamber aligned in the axial direction, a generator housing that defines a rotor chamber and is detachably connected to one end of the turbine housing in the axial direction, a rotating shaft integrally provided on the same axis with a first shaft portion extending in the axial direction within the turbine housing and a second shaft portion extending in the axial direction within the generator housing, a hollow shaft that extends in the axial direction and has a hollow portion through which the second shaft portion is inserted, and is slidably fitted to the outer circumference of the second shaft portion in the axial direction, a first bearing that rotatably supports the first shaft portion in the turbine housing, and the generator housing The turbine has a second bearing and a third bearing that rotatably support the hollow shaft, a compressor wheel that is torque-transmittingly coupled to the first shaft in the compressor chamber, a turbine wheel that is torque-transmittingly coupled to the first shaft in the turbine chamber, a combustor provided in the turbine housing, a cylindrical generator stator fixed in the generator housing, a generator rotor that is torque-transmittingly coupled to the hollow shaft and located inside the generator stator, and a first fixing member that is detachably fixed to the end of the second shaft opposite to the first shaft, wherein the hollow shaft and the rotating shaft have opposing end faces that face each other. [Effects of the Invention]

[0008] According to the above embodiment, the workability for separating the gas turbine unit and the generator unit is improved. [Brief explanation of the drawing]

[0009] [Figure 1] This is a longitudinal cross-sectional view showing a gas turbine generator according to this embodiment. [Figure 2] This diagram illustrates the separation state of the gas turbine generator according to this embodiment. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0011] As shown in Figure 1, the gas turbine generator 10 of this embodiment comprises a gas turbine device 12 and a generator 14. In the following description, the side with the generator 14 is defined as the front side (left side in Figure 1), and the side with the gas turbine device 12 (right side in Figure 1).

[0012] The gas turbine device 12 has a turbine housing 20. The turbine housing 20 has, in order from the front, a plate-shaped front end housing 22, a cylindrical first intermediate housing 24 and a second intermediate housing 26, a plate-shaped third intermediate housing 28, a cylindrical fourth intermediate housing 30 and a rear housing 32, all coaxially arranged. These housings 22, 24, 26, 28, 30, and 32 are detachably connected to each other by bolts 34, 36, 38, and 40, respectively, in the axial direction (left-right direction as seen in Figure 1).

[0013] The generator 14 has a generator housing 50 arranged on the same axis as the turbine housing 20. The generator housing 50 has, in order from the front, a plate-shaped front end housing 52, a cylindrical first intermediate housing 54, a second intermediate housing 56, and a rear housing 58, all arranged coaxially. These housings 52, 54, 56, and 58 are axially adjacent to each other and are separated from one another by bolts or the like (not shown), defining the rotor chamber 55. The second intermediate housing 56 is a housing for taking the power cable (not shown) of the generator 14 out of the generator housing 50, and is made of resin. The second intermediate housing 56 may be insert-molded into the first intermediate housing 54. An end wall member 53 is attached to the rear end of the rear housing 58.

[0014] A single rotating shaft 60 is positioned axially at the center of the turbine housing 20 and the generator housing 50. The rotating shaft 60 integrally comprises a first shaft portion 60A located within the turbine housing 20, a second shaft portion 60B located within the generator housing 50, and a flange portion 60C provided between the first shaft portion 60A and the second shaft portion 60B, having a larger outer diameter than the first shaft portion 60A and the second shaft portion 60B.

[0015] A hollow shaft 62 is fitted to the outer circumference of the second shaft portion 60B so as to be removable in the axial direction, and the hollow shaft 62 is coupled to the first spline 59 so as to be able to transmit torque. In other words, the hollow shaft 62 extends in the axial direction and has a hollow portion 62A through which the second shaft portion 60B is inserted. To put it another way, the hollow shaft 62 is fitted to the outer circumference of the second shaft portion 60B so as to be removable in the axial direction, and is coupled to the second shaft portion 60B so as to be able to transmit torque by the first spline 59. The rear end face (opposing end face) of the hollow shaft 62 and the front face (opposing end face) of the flange portion 60C are facing each other and in contact.

[0016] The support structure for the rotating shaft 60 and the hollow shaft 62 will be described.

[0017] The fourth intermediate housing 30 of the turbine housing 20 integrally comprises an outer cylindrical portion 30A, an inner cylindrical portion 30C concentrically arranged inside the outer cylindrical portion 30A by a connecting plate portion 30B, and a bearing mount cylindrical portion 30D continuous with the inner cylindrical portion 30C and concentrically arranged inside the inner cylindrical portion 30C. The outer cylindrical portion 30A and the inner cylindrical portion 30C define an annular cross-section exhaust passage 31. A flow straightening cone member 37 is attached to the rear end of the inner cylindrical portion 30C. The flow straightening cone member 33 is positioned in the exhaust passage 35 defined by the rear housing 32.

[0018] An inner sleeve 64 is fitted to the outer periphery near the rear end of the first shaft portion 60A. An outer sleeve 66 is fitted to the inner periphery of the bearing mounting cylindrical portion 30D. A rear rolling bearing 68 is mounted between the outer periphery of the inner sleeve 64 and the inner periphery of the outer sleeve 66. Thereby, the turbine housing 20 rotatably supports the vicinity of the rear portion of the rotating shaft 60 by the rear rolling bearing 68.

[0019] The rear housing 58 of the generator housing 50 has an annular portion 58B in the vicinity of its rear portion. An intermediate rolling bearing 70 is mounted between the inner periphery of the annular portion 58B and the outer periphery near the rear end of the hollow shaft 62. Thereby, the generator housing 50 rotatably supports the vicinity of the rear portion of the hollow shaft 62 by the intermediate rolling bearing 70.

[0020] A bearing mounting sleeve 72 is attached to the first intermediate housing 54 of the generator housing 50. A front rolling bearing 74 and an oil seal member 75 are mounted between the inner periphery of the bearing mounting sleeve 72 and the outer periphery near the front end of the hollow shaft 62. Thereby, the turbine housing 20 rotatably supports the vicinity of the front end of the hollow shaft 62 by the front rolling bearing 74.

[0021] The front end housing 52 has a recess 52A that opens forward. The front end of the second shaft portion 60B protrudes into the recess 52A. A first nut 77 is threadedly coupled to the front end of the second shaft portion 60B inside the recess 52A. Thereby, the hollow shaft 62 is sandwiched with a required axial force between the front surface of the flange portion 60C and the rear surface of the first nut 77 via the sleeve 61 and the resolver sensor 63 that are detachably attached to the outer periphery near the front end of the second shaft portion 60B, and is fixed to the second shaft portion 60B in a state where axial movement relative to the second shaft portion 60B is restricted. A cap 65 that closes the recess 52A is detachably attached to the front end housing 52. The hollow shaft 62 is sandwiched with an axial force between the front surface (opposing end surface) of the flange portion 60C and the rear surface (opposing end surface) of the first nut 77 (first fixing member) threadedly coupled to the vicinity of the front end of the second shaft portion 60B, and axial movement relative to the second shaft portion 60B is restricted.

[0022] An annular flange portion 22A is formed at the front end of the front end housing 22, in other words, at the front end of the turbine housing 20. An annular flange portion 58A is formed at the rear end of the rear housing 58, in other words, at the rear end of the generator housing 50. The front surface (opposing end surface) of the flange portion 22A of the turbine housing 20 and the rear surface (opposing end surface) of the flange portion 58A of the generator housing 50 axially oppose each other. The flange portion 22A of the turbine housing 20 and the flange portion 58A of the generator housing 50 are detachably coupled by bolts 51.

[0023] A compressor wheel 76, a spacer 78, a front-stage turbine wheel 80, a rear-stage turbine wheel 82, and an inner sleeve 64 are fitted in this order from the front side to the first shaft portion 60A of the rotary shaft 60. These components are axially sandwiched between the rear surface of the flange portion 60C and the front surface of a second nut 84 (second fixing member) screwed to the rear end of the first shaft portion 60A, and their axial movement relative to the first shaft portion 60A is restrained with a required axial force.

[0024] The compressor wheel 76 is coupled to the first shaft portion 60A by a second spline 86 so as to be capable of torque transmission. The front-stage turbine wheel 80 and the rear-stage turbine wheel 82 are coupled by a curvic coupling 88 so as to be capable of torque transmission. The inner sleeve 64 is coupled to the front-stage turbine wheel 80 by the curvic coupling 88 so as to be capable of torque transmission, and is also coupled to the compressor wheel 76 by a curvic coupling 91 so as to be capable of torque transmission.

[0025] Thereby, the rotation of the front-stage turbine wheel 80 and the rear-stage turbine wheel 82 is transmitted to the compressor wheel 76 via the inner sleeve 64, and is further transmitted to the first shaft portion 60A via the compressor wheel 76.

[0026] The turbine housing 20 is equipped with cone-shaped partition members 92 and 94, a diffuser 96, a combustor 98, and an annular stator vane member 100. These components define, from front to back, an air intake 108, a compressor chamber 112, a diffuser passage 114, a compressed air passage 116, and a turbine chamber 118.

[0027] The combustor 98 includes a combustion chamber container 104 that defines a combustion chamber 102 having an annular cross-section, and a fuel injection nozzle 106 attached to the combustion chamber container 104 that injects fuel into the combustion chamber 102.

[0028] The compressor wheel 76 is located inside the compressor chamber 112. The front turbine wheel 80 and the rear turbine wheel 82 are located inside the turbine chamber 118. A stationary vane member 100 is located between the front turbine wheel 80 and the rear turbine wheel 82.

[0029] Air (outside air) taken in from the air intake 108 into the air introduction passage 110 flows into the compressor chamber 112, where it is compressed by the rotation of the compressor wheel 76 to become compressed air. The compressed air flows through the diffuser passage 114 and the compressed air passage 116 and enters the combustion chamber 102. In the combustion chamber 102, a mixture of fuel injected into the combustion chamber 102 by the fuel injection nozzle 106 and compressed air burns, generating combustion gases.

[0030] Combustion gases flow into the turbine chamber 118 and rotate the front turbine wheel 80 and the rear turbine wheel 82. The rotation of the front turbine wheel 80 and the rear turbine wheel 82 causes the rotating shaft 60 and the hollow shaft 62 to rotate integrally with the front turbine wheel 80 and the rear turbine wheel 82.

[0031] The combustion gases that have passed through the turbine chamber 118 are discharged as exhaust gases through the exhaust passages 31 and 35 into the outside air at the rear.

[0032] A generator rotor 130 is attached to the outer circumference of the hollow shaft 62. A cylindrical generator stator 132 is attached to the inner circumference of the rear housing 58. The generator rotor 130 is located inside the generator stator 132. Power is generated when the generator rotor 130 rotates integrally with the hollow shaft 62.

[0033] When performing maintenance on the gas turbine generator 10, as shown in Figure 2, to separate the gas turbine unit 12 and the generator 14, first remove the cap 65 from the front end housing 52, and then loosen the first nut 77 and remove it from the second shaft portion 60B. After that, remove the resolver sensor 63 and sleeve 61 from the second shaft portion 60B.

[0034] Next, the bolt 51 is loosened and removed to release the connection between the turbine housing 20 and the generator housing 50 by the bolt 51. Then, with axial sliding of the first spline 59, the entire hollow shaft 62 and generator housing 50 are moved to the left axially relative to the second shaft portion 60B of the rotating shaft 60 as seen in Figure 2, and the hollow shaft 62 is withdrawn from the second shaft portion 60B of the rotating shaft 60. This completes the separation of the generator 14 and the gas turbine unit 12. Reassembly can be performed by reversing the above separation procedure.

[0035] In this way, the separation and reassembly of the gas turbine unit 12 and the generator 14 can be performed efficiently without requiring difficult work.

[0036] When removing the front turbine wheel 80 and rear turbine wheel 82 from the rotating shaft 60 during maintenance of the gas turbine device 12, first, the turbine housing 20 is disassembled and the second nut 84 is removed. Next, the front turbine wheel 80 and rear turbine wheel 82 are moved to the right in the axial direction relative to the first shaft portion 60A of the rotating shaft 60 together with the inner sleeve 64, and the front turbine wheel 80 and rear turbine wheel 82 are removed from the first shaft portion 60A.

[0037] Since the compressor wheel 76, the front turbine wheel 80, the rear turbine wheel 82, and the inner sleeve 64 are connected to each other by Garbics 88, 89, and 91 on an axially adjacent basis, the fitting between the front turbine wheel 80, the rear turbine wheel 82, and the inner sleeve 64 and the first shaft portion 60A may be a loose fit. This makes it easier to remove the front turbine wheel 80, the rear turbine wheel 82, and the inner sleeve 64 from the first shaft portion 60A, improving the workability of disassembling the gas turbine unit 12.

[0038] To remove the compressor wheel 76 from the rotating shaft 60, the compressor wheel 76 is moved to the right axially relative to the first shaft portion 60A of the rotating shaft 60, accompanied by axial sliding of the second spline 86, and the compressor wheel 76 is pulled out from the first shaft portion 60A. This allows the compressor wheel 76 to be easily removed from the rotating shaft 60.

[0039] Although the present invention has been described above in terms of preferred embodiments, as will be easily understood by those skilled in the art, the present invention is not limited to these embodiments and can be modified as appropriate without departing from the spirit of the invention.

[0040] For example, the structure in which the hollow shaft 62 is axially slidable and torque-transmittingly connected to the second shaft portion 60B of the rotating shaft 60 is not limited to the first spline 59, but may also be a sliding key, serrations, etc.

[0041] If the intermediate rolling bearing 70 is a rolling bearing with small axial displacement between the inner and outer races of the bearing, such as an angular contact ball bearing, then the restriction of the rearward axial movement of the hollow shaft 62 relative to the rotating shaft 60 can be achieved by having the rear end face (opposing end face) of the generator housing 50 abut against the front end face (opposing end face) of the turbine housing 20, instead of the rear end face (opposing end face) of the hollow shaft 62 abutting against the front surface (opposing end face) of the flange portion 60C of the rotating shaft 60. The front surface of the flange portion 60C of the rotating shaft 60 can also be formed by a stepped end face created by a difference in outer diameter in the intermediate part of the rotating shaft 60.

[0042] The rear rolling bearing 68 and the front rolling bearing 74 may be roller bearings. By having the rear rolling bearing 68 and the front rolling bearing 74 be roller bearings that allow movement in the axial direction, it is possible to provide axial adjustment between the rear or front end of the rotating shaft 60 and the turbine housing 20 or generator housing 50.

[0043] The first fixing member detachably attached to the front end of the second shaft portion 60B and the second fixing member detachably attached to the rear end of the first shaft portion 60A are not limited to the first nut 77 and the second nut 84, but may be removable fasteners using wedges or the like that apply the required axial force to a member on the shaft portion by fastening the wedge or the like to the shaft portion.

[0044] The sleeve 61 may also be used as the nut for the first fixing member. In this case, the first nut 77 only needs to fix the resolver sensor 63, and axial force adjustment associated with replacing the resolver sensor 63 is unnecessary, thus improving the workability of gas turbine generator maintenance.

[0045] Instead of the generator 14, an electric motor may be connected to the gas turbine device 12 as a rotating machine. In this case, a combined rotary drive system is configured in which the electric motor and the gas turbine device each serve as rotary drive units.

[0046] Furthermore, not all of the components shown in the above embodiments are necessarily essential, and they can be appropriately selected and omitted as long as they do not deviate from the spirit of the present invention.

[0047] The above embodiments may also be described as follows:

[0048] One embodiment is a gas turbine generator 10 comprising: a turbine housing 20 aligned axially and defining a compressor chamber 112 and a turbine chamber 118; a generator housing 50 detachably connected axially to one end of the turbine housing and defining a rotor chamber 55; a rotating shaft 60 integrally provided on the same axis with a first shaft portion 60A extending axially within the turbine housing and a second shaft portion 60B extending axially within the generator housing; a hollow shaft 62 extending axially and having a hollow portion 62A through which the second shaft portion is inserted, and slidably fitted axially to the outer circumference of the second shaft portion; a rear rolling bearing 68 (first bearing) rotatably supporting the first shaft portion in the turbine housing; and an intermediate rolling bearing 70 (second bearing) and a front rolling bearing rotatably supporting the hollow shaft in the generator housing. The turbine has a 74 (third bearing), a compressor wheel 76 that is torque-transmittingly coupled to the first shaft in the compressor chamber, a front turbine wheel 80 and a rear turbine wheel 82 (turbine wheel) that are torque-transmittingly coupled to the first shaft in the turbine chamber, a combustor 98 provided in the turbine housing, a cylindrical generator stator 132 fixed in the generator housing, a generator rotor 130 that is torque-transmittingly coupled to the hollow shaft and located inside the generator stator, and a first nut 77 (first fixing member) that is detachably fixed to the end of the second shaft opposite to the first shaft, wherein the hollow shaft and the rotating shaft have opposing end faces that face each other, and the axial movement of the hollow shaft relative to the rotating shaft is constrained by the contact of the opposing end faces and the first fixing member.

[0049] According to this embodiment, the ease of separating the gas turbine unit and the generator unit is improved.

[0050] In the above embodiment, the gas turbine generator may further have a first spline 59 that connects the hollow shaft and the second shaft portion so as to be slidable in the axial direction and capable of transmitting torque.

[0051] According to this embodiment, a good coupling is achieved between the hollow shaft and the first shaft portion that allows for axial sliding and torque transmission.

[0052] In the above embodiment, the first fixing member may include a first nut 77 that is screw-connected to the second shaft portion.

[0053] According to this embodiment, the fixing member is easily constructed.

[0054] In the above embodiment, the rotating shaft may have a flange portion 60C between the first shaft portion and the second shaft portion having an outer diameter larger than the outer diameters of the first and second shaft portions, and the end face of the flange portion on the side of the second shaft portion may constitute the opposing end face.

[0055] According to this embodiment, the axial contact between the rotating shaft and the hollow shaft is made in good condition.

[0056] In the above embodiment, the gas turbine generator may further have a second spline 86 that connects the compressor wheel to the first shaft so as to be slidable in the axial direction and to transmit torque.

[0057] According to this embodiment, the compressor wheel can be easily removed from the first shaft.

[0058] In the above embodiment, the turbine wheel and the compressor wheel are connected to each other by Garbics 88, 89, 91, and a second nut 84 (second fixing member) is detachably fixed to the end of the first shaft portion opposite to the second shaft portion, and the turbine wheel and the compressor wheel are sandwiched between the flange portion and the second fixing member with a predetermined axial force.

[0059] According to this embodiment, torque transmission between the front-stage turbine wheel, the rear-stage turbine wheel and the compressor wheel is ensured, and the ease of removing the front-stage turbine wheel and the rear-stage turbine wheel from the first shaft is improved.

[0060] In the above embodiment, the first fixing member may include a first nut 77 that is screw-connected to the second shaft portion.

[0061] According to this embodiment, the fixing member is easily constructed. [Explanation of symbols]

[0062] 10: Gas turbine generator 12: Gas turbine equipment 14: Generator 20: Turbine Housing 50: Generator Housing 58A: Flange section 59: First spline 60: Rotation axis 60A: First shaft section 60B: 2nd shaft part 60C: Flange section 62:Hollow shaft 62A: Hollow part 68: Rear rolling bearing (first bearing) 70: Intermediate rolling bearing (second bearing) 74: Front rolling bearing (third bearing) 76: Compressor Wheel 77: First nut (first fixing member) 80: Front-stage turbine wheel (turbine wheel) 82: Rear-stage turbine wheel (turbine wheel) 84: Second nut (second fixing member) 86: Second spline 88: Garvic 89: Garvic 91: Garvic 98: Combustor 112: Compressor Room 118: Turbine Room 130: Generator Rotor 132: Generator Stator

Claims

1. A turbine housing that is aligned in the axial direction and defines the compressor chamber and the turbine chamber, A generator housing is detachably connected to one end of the turbine housing in the axial direction and defines the rotor chamber, A rotating shaft comprising a first shaft portion extending in the axial direction within the turbine housing and a second shaft portion extending in the axial direction within the generator housing, integrally provided on the same axis, A hollow shaft having a hollow portion extending in the axial direction through which the second shaft portion is inserted, and a hollow shaft that is slidably fitted to the outer circumference of the second shaft portion in the axial direction, The turbine housing includes a first bearing that rotatably supports the first shaft portion, The generator housing includes a second bearing and a third bearing that rotatably support the hollow shaft, A compressor wheel is coupled to the first shaft portion in the compressor chamber so as to be able to transmit torque, In the turbine chamber, a turbine wheel is coupled to the first shaft so as to be able to transmit torque, A combustor provided within the turbine housing, A cylindrical generator stator fixed within the generator housing, A generator rotor is coupled to the hollow shaft in a manner that allows for torque transmission and is located inside the generator stator, The second shaft portion has a first fixing member that is detachably fixed to the end of the second shaft portion opposite to the first shaft portion, The hollow shaft and the rotating shaft have opposing end faces that face each other. A gas turbine generator in which the axial movement of the hollow shaft relative to the rotating shaft is constrained by the contact of the opposing end faces and the first fixing member.

2. The gas turbine generator according to claim 1, having a first spline that connects the hollow shaft and the second shaft portion so as to be slidable in the axial direction and capable of transmitting torque.

3. The gas turbine generator according to claim 1 or 2, wherein the first fixing member includes a first nut that is screw-connected to the second shaft portion.

4. The gas turbine generator according to claim 1 or 2, wherein the rotating shaft has a flange portion with an outer diameter larger than the outer diameters of the first shaft portion and the second shaft portion, and the end face of the flange portion on the side of the second shaft portion constitutes the opposing end face.

5. The gas turbine generator according to claim 4, further comprising a second spline that connects the compressor wheel to the first shaft portion so as to be slidable in the axial direction and capable of transmitting torque.

6. A Garvik is used to connect the turbine wheel and the compressor wheel to each other. The first shaft portion has a second fixing member that is detachably fixed to the end of the first shaft portion opposite to the second shaft portion, The gas turbine generator according to claim 5, wherein the turbine wheel and the compressor wheel are sandwiched between the flange portion and the second fixing member with a predetermined axial force.

7. The gas turbine generator according to claim 6, wherein the second fixing member includes a second nut that is screw-connected to the first shaft portion.

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