WO2003048527A1

WO2003048527A1 - Gas turbine power generator and its assembling method

Info

Publication number: WO2003048527A1
Application number: PCT/JP2001/010483
Authority: WO
Inventors: Yasushi Hayasaka; Masaru Sekihara; Satoshi Dodo
Original assignee: Hitachi, Ltd.
Priority date: 2001-11-30
Filing date: 2001-11-30
Publication date: 2003-06-12
Also published as: JPWO2003048527A1; JP4283114B2

Abstract

A gas turbine power generator is provided with a tie-bolt (5) having a large-diameter portion (5a) and a small-diameter portion (5b) and serving as a spindle. A compressor (3) and a turbine (4) engage with the large-diameter portion (5a), and the rotor (14) of a power generator (13) is fitted on the small-diameter portion (5b) to constitute an integral rotating rotor (16). The tie-bolt (5) has a larger diameter at a portion relatively close to the turbine (3) and in a high-temperature environment, to retain a strength enough to stand high-speed rotation in the high-temperature environment. The rotor (14) in a relatively low-temperature environment is fitted to the small-diameter portion (5b) of the tie-bolt (5), and the diameter of a shaft hole (14e) extending through the small-diameter portion (5b). In short, the hoop stress acting on the rotor (14) is reduced to prevent the lifetime from becoming short. Therefore, it is possible to ensure the reliability of the tie-bolt (5) serving as the spindle sufficiently.

Description

TECHNICAL FIELD The present invention relates to a gas turbine power generator and an assembling method thereof.

TECHNICAL FIELD The present invention relates to a gas bin generator that compresses sucked outside air, sends it to a combustor, rotates a turbine with combustion gas from the combustor to generate power, and a method of assembling the same. Background art

In many parts of the world, energy shortages due to shortage of electrical components and wiring have become a problem, and in recent years, a small gas turbine called a microphone-mouth gas turbine has been developed for the purpose of supplying electricity in small areas and emergency power. A gas turbine generator using a bin as a power source has been proposed as a distributed power generation system.

Examples of such a gas turbine power generator include, for example, Japanese Patent Application Laid-Open No. 2001-125256, Japanese Patent Application Laid-Open No. Hei 9-313509, and Japanese Patent Application Laid-Open No. Hei 9-5105022. It has already been proposed in the official gazette. In these prior arts, a compressor connected to a turbine via a rotating shaft is rotated to compress external air drawn from an intake port and send the compressed air to a combustor. Is rotated at high speed, and at the same time, the rotor of a generator provided coaxially with the turbine is rotated to generate power.

In the above prior art, the turbine, the compressor, the rotor of the generator, and the like are connected via a rotating shaft and constitute a rotating body that rotates integrally. At this time, since the rotating shaft is inserted or screwed into the center of rotation of each component of the rotating body such as the above-mentioned bin and compressor, when the diameter of the rotating shaft increases, the compressor, turbine, etc. The diameter of the shaft hole for screwing the rotating shaft (the screw hole when the rotating shaft is screwed) also becomes larger.

Here, since the gas turbine power generation device in the above-mentioned conventional technology is configured to be small, it is necessary to rotate the rotating body at a considerably high speed in order to obtain a predetermined output. That Therefore, when the diameter of the shaft hole is increased, the stress acting on each component of the rotating body, such as the evening bottle, the rotor of the compressor and the generator, etc., increases, and the life of each component is shortened. There is a possibility. This is because the hoop stress acting near the surface of the shaft hole increases as the size of the shaft hole in each component increases. For this reason, it is preferable that the diameter of the rotating shaft be as small as possible within a range where desired strength can be secured. However, on the other hand, the rotating shaft near the turbine that receives the combustion gas is susceptible to deterioration because it is exposed to the high temperature environment, and a higher strength is required for the rotating shaft near the turbine. In addition, this part is also a place where small damage is likely to occur when joining with a turbine during assembly or the like, and the strength is likely to be reduced. From this viewpoint, it is necessary to provide sufficient strength in advance.

However, in the above prior art, each of the rotating shafts is simply formed to have substantially the same diameter over the entire length in the longitudinal direction, and when the rotating shaft is made relatively thin in order to reduce the hoop stress, the rotating shaft becomes May not be strong enough to withstand high-speed rotation in a high-temperature environment near the turbine. For this reason, it is difficult to secure sufficient strength for high-speed rotation in a high-temperature environment while reducing the hoop stress acting on each component of the rotating body with the above-mentioned conventional technology. There is room for further improvement in terms of perspective. Disclosure of the invention

An object of the present invention is to provide a gas turbine power generator and a method for assembling the same, which can sufficiently ensure the reliability of a rotating shaft.

(1) In order to achieve the above-mentioned object, the present invention provides a compressor including a compressor and an evening bin in a casing, compressing the outside air taken in from an intake port by the compressor and sending the compressed air to a combustor. In the gas turbine power generator for rotating the turbine by the combustion gas discharged from the compressor to generate electric power, a rotating center of the evening bin and the compressor, both ends of which are engaged with the evening bin and the compressor. A rotating shaft having a diameter portion and a small diameter portion connected to the large diameter portion is provided.

In the present invention, the rotating shaft serving as the rotation center of the turbine and the compressor has a large diameter portion and a small diameter portion. And a portion of the rotating shaft that engages with the turbine and the compressor. The large diameter portion is used for the rotor, and the rotor of the generator is incorporated in the small diameter portion of the rotating shaft. In other words, the rotating shaft has a large diameter at a portion relatively close to the evening bin, and can secure sufficient strength to withstand high-speed rotation in a high-temperature environment. Further, since the rotor of the generator is incorporated in the small diameter portion of the rotating shaft, the diameter of the shaft hole through which the rotating shaft is inserted can be reduced, so that the above-mentioned hoop stress can be reduced. Life can be prevented. Therefore, the reliability of the rotating shaft can be sufficiently ensured.

(2) In order to achieve the above object, the present invention also provides a compressor and a vial which are enclosed in a casing, and the compressor compresses outside air taken from an intake port and sends it to a combustor. A gas turbine power generator that generates electricity by rotating the above-mentioned bin by the combustion gas discharged from the turbine, wherein the large-diameter portion is a rotation center of the above-mentioned turbine and compressor and both ends are engaged with the above-mentioned turbine and compressor. A rotary shaft having a small-diameter portion connected to the large-diameter portion; and a support member for supporting the casing such that the axial direction of the rotary shaft rotates in the horizontal direction.

(3) In the above (1) or (2), preferably, the evening bottle is provided with a joining boss for joining the rotating shaft.

(4) In any one of the above (1) to (3), preferably, the compressor has a shaft hole that fits into a large-diameter portion of the rotating shaft. At least a part of the contact surfaces of the large-diameter portions is a taper surface or a lavette surface.

(5) In any one of the above (1) to (4), preferably, further comprising an orifice shaft fitted to a small-diameter portion of the rotary shaft so as to abut on the compressor. At least a part of the contact surface between the rotor shaft and the compressor is a tapered surface or a lavet surface.

(6) In the above (5), preferably, further comprising a rotor of a generator fitted to a small diameter portion of the rotating shaft so as to abut on the rotor shaft, wherein the rotor and the shaft of the opening and closing shaft are provided. At least a part of the contact surfaces is a taper surface or a lavette surface.

(7) In any one of the above (4) to (6), more preferably, the contact surface is roughened. (8) In any one of the above (1) to (7), preferably, the small-diameter portion of the rotating shaft comprises a plurality of portions made of different materials.

(9) In any one of the above (1) to (8), preferably, the mouth shaft is formed of a corrosion resistant alloy.

(10) In any one of the above (1) to (9), preferably, the apparatus further comprises a washing device for washing the compressor or the turbine.

(11) In any one of the above (1) to (10), preferably, the apparatus further comprises a cooling device for spraying cooling water near an intake port of the casing.

(12) In (11) above, preferably, cooling water used for the cooling device is used as a refrigerant.

(13) In order to achieve the above-described object, the present invention provides a compressor, which includes a compressor and an evening bottle in a casing, compresses outside air taken in from an intake port by the compressor, and sends the compressed air to a combustor. In the method of assembling a gas turbine power generator for generating electric power by rotating the turbine with the combustion gas discharged from a heater, the casing is fixed so that the axial direction of the turbine is substantially vertical, and the casing is fixed in the casing. The above-mentioned turbine and a rotary shaft having a large-diameter portion joined to the turbine and a small-diameter portion connected to the large-diameter portion are installed in a substantially vertical direction, and a compressor is installed from the upper end of the small-diameter portion of the rotary shaft, which is almost vertically upward. The rotary shaft is fitted to the upper end of the large-diameter portion of the rotating shaft, and the mouth shaft and the rotor of the generator are sequentially assembled into the small-diameter portion of the rotating shaft so as to be stacked on the compressor. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view showing a partial cross section of the entire structure of the first embodiment of the gas turbine power generator of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a rotating body provided in the first embodiment of the gas evening bin power generator of the present invention.

FIG. 3 is a diagram schematically illustrating the structures of a cleaning device and a cooling device provided in the first embodiment of the gas turbine power generator of the present invention.

FIG. 4 is a diagram illustrating an assembling procedure of the first embodiment of the gas turbine power generator of the present invention. FIG. 5 is a diagram illustrating an assembling procedure of the first embodiment of the gas turbine power generator of the present invention.

FIG. 6 is a diagram illustrating an assembling procedure of the first embodiment of the gas turbine power generator of the present invention. '

FIG. 7 is a partial cross-sectional view illustrating a modification of the rotating body provided in the first embodiment of the gas turbine power generator of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the gas turbine power generation device of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a partial cross section of the entire structure of a first embodiment of a gas evening bin power generator according to the present invention.

As shown in FIG. 1, the gas turbine power generation device of the present embodiment is composed of a micro gas evening bin (not limited to a micro gas turbine, but may be a simple gas turbine) 1 and a generator 13. I have. The micro gas evening bin 1 includes a casing 2, a compressor 3 and a turbine 4 provided in the casing 2, and a tie bolt 5 serving as a rotating shaft of the compressor 3 and the evening bin 4. It is roughly composed of

The casing 2 is composed of split casings 6 and 7, a spacer 8 interposed between the split casings 6 and 7, and an inner casing 9 provided in the split casing 7. The split casings 6, 7 and the spacer 8 are provided with bolts 10a and nuts with the spacer 8 sandwiched between the flanges 6a, 7a provided on the opposite end faces of the split casings 6, 7 respectively. It is concluded by 10b. The inner casing 9 is welded to the split casing 7. However, the inner casing 9 may be configured to be detachable from the split casing 7, or may be integrally formed with the split casing 7 by precision construction or the like. The inner peripheral surfaces of the split casings 6 and 7 face the outer peripheral surfaces of the compressor 3 and the turbine 4 with a predetermined gap therebetween.

Inside the split casing 6, there is provided a flow path 6c for drawing outside air sucked through the intake port 6b, and the outside air drawn from the flow path 6c is supplied to the regenerative heat exchanger (see FIG. (Not shown) and sent to a combustor (not shown). The flow passage 6c is a passage for the compressed air compressed by the compressor 3, and although not particularly shown, a vane or the like may be provided in consideration of the pressure recovery of the passing compressed air. Although not particularly shown for the purpose of preventing complication, a filter is provided at the intake port 6b to prevent dust from being sucked into the casing 2 together with the outside air. The combustor mixes fuel with the outside air supplied through the flow path 6 c and burns the fuel. The combustion gas from the combustor flows into the flow path 9 a in the inner casing 9. When the gas flows in and passes through the nozzle 9b, it is rectified and discharged from the exhaust port 9c, and is guided to the regenerative heat exchanger. In the present embodiment, the nozzle 9 b is fixed to the inner casing 9 with, for example, a pin.

At this time, the passage 6 c on the intake side in the casing 2 is separated from the passage 9 a on the exhaust side by the spacer 8. Therefore, it is preferable that the spacer 8 be provided with, for example, a labyrinth seal / honeycomb seal, a brush seal, etc., in order to prevent leakage of the working fluid from the flow path.

FIG. 2 is a partial cross-sectional view illustrating a rotor 16 in the gas turbine power generator shown in FIG. As shown in Fig. 2, although details are described later,

The (rotating body) 16 is roughly composed of the compressor 3, the tarpin 4, and the tie bolt 5, and a mouth shaft 11 and a rotor 14, which will be described later.

The compressor 3 is a centrifugal compressor, and is composed of a disk 3a and a plurality of wings 3b provided on the disk 3a. For example, titanium alloy or aluminum is formed by precision manufacturing, forging, machining, or the like. It is formed of an alloy or the like. Further, a shaft hole 3c passing through the tie port 5 is provided at the rotation center of the disk 3a.

The turpin 4 is a radial turbine, and includes a disk 4a, a plurality of blades 4b provided on the disk 4a, a joining boss 4c protruding from the disk 4a, and a grip 4d. It is configured. The joining boss portion 4c is a joining portion with the tie bolt 5, and the outer peripheral portion is formed into an R-shaped shape so that the diameter increases toward the disk portion 4a. Since the turbine 4 is exposed to the high-temperature combustion gas, the turbine 4 is formed by, for example, precision forging, forging, or machining with a nickel-based superalloy or the like. Further, as a joining method of the evening bin 4 and the tie bolt 5, friction welding, electron beam welding, diffusion joining, or the like is preferable. The grip portion 4d has a parallel surface such as a nut, and It has a shape that makes it easy to grasp with tools. The grip portion 4 d is used to connect the turbine 4 to the tie bolt 5, to apply pretension to the tie bolt 5, and to tighten the nut 17 into the screw portion 5 be (described later). It is designed to ensure that it can be fixed securely.

The tie bolt 5 is a rotation center of the mouth 16 and has a large diameter portion 5a and a small diameter portion 5b extending from the other end (the right end in FIG. 2) of the large diameter portion 5a. are doing. One end (the left end in FIG. 2) of the large diameter portion 5 a is joined to the joining boss 4 c of the turbine 4, and the other end (the right side in FIG. 2) is fitted to the shaft hole 3 c of the compressor 3. I'm fitting. At this time, the contact surface between the shaft hole 3c and the large-diameter portion 5a is a tapered surface that increases in diameter toward one side (the left side in FIG. 2).

The small-diameter portion 5b of the tie bolt 5 has a connection portion 5ba with the large-diameter portion 5a on one end (the left end in FIG. 2), a long-axis portion 5bb connected to the connection portion 5ba, and It consists of a screw 5bc provided at the other end (right end in Fig. 2) of the shaft 5bb. The connecting portion 5 ba is located relatively close to the bin 4 in a high-temperature environment, and is formed integrally with the large-diameter portion 5 a using a material having high high-temperature strength, such as a nickel-base superalloy. Have been. The connecting portion 5ba forms a small diameter portion 5b together with the long shaft portion 5bb joined by a method such as friction welding. In the present embodiment, the long shaft portion 5bb is made of an inexpensive iron-based material. As described above, in the present embodiment, the small-diameter portion 5b of the evening bolt 5 is composed of two portions having different materials.

The tie bolt 5 is joined to the turbine 4 as described above. At the time of joining, the grip portion 4d of the turbine 4 is gripped, and the large-diameter portion 5a of the tie bolt 5 is joined to the joining boss portion 4c of the tarpin 4 by, for example, friction welding. Next, the long shaft portion 5bb is friction-welded to the connection portion 5ba of the small diameter portion 5b located at the other end (the right end in FIG. 2) of the large diameter portion 5a. After the pressure welding, heat treatment is performed to remove residual stress, and in some cases, heat treatment for improving the strength of the alloy is performed. Finally, machining will be performed to balance turbine 4 and tie bolts 5.

Further, as shown in FIG. 2, a small-diameter portion 5 b of the turbine 5 is fitted (loosely fitted) with a mouth shaft 11 so as to be in contact with the compressor 3. The contact surface between the rotor shaft 11 and the compressor 3 faces the turbine 4 (to the left in FIG. 2). The tapered surface has a reduced diameter. A bearing collar 12 for supporting loads in the radial and thrust directions is fitted to the outer peripheral portion of the mouth shaft 11.

The rotor 14 of the generator 13 (see Fig. 1) is fitted to the small diameter portion 5b of the tie bolt 5 so as to abut the other end of the shaft 11 (the right end in Fig. 2) (see Fig. 1). (Loose fitting). The rotor 14 includes a generator core 14a, a permanent magnet 14b provided on an outer periphery of the generator core 14a, and a cover 1 provided on an outer periphery of the permanent magnet 14b. 4c and an end cover 14d at one end (the left end in FIG. 2) in the axial direction. The generator core 14a is formed of a magnetic material into a substantially cylindrical shape, has a shaft hole 14e at the center of rotation, and is connected to the shaft hole 14e via an end cover 14d. The small-diameter portion 5b is passed through. The permanent magnet 14b is formed into a substantially cylindrical shape by a plurality of parts (although it may be formed integrally), and is fitted on the outer periphery of the generator core 14a. The cover 14c located at the outermost periphery of the rotor 14 prevents the permanent magnets 14b from scattering or slipping between the generator core 14a and the permanent magnets 14b during rotation. It is. The cover 14c has a fitting structure of interference fit with the permanent magnet 14b, and the permanent magnet 14b is preferably pressed radially inward against the generator core 14a. . Further, as the material of the cover 14c, a high-strength non-magnetic metal such as a nickel-based alloy or FRP is preferable. The end cover 14 d is fitted to the other end of the shaft 11 (the right end in FIG. 2), and the end cover 14 d and the rotor shaft 11 are in contact with each other. The surface is a tapered surface that expands toward turbine 4 (to the left in FIG. 2). The rotor 16 incorporates the mouth shaft 5, the rotor 14, and the holding cover 15 into the evening bolt 5 joined to the vial 4, and the screw section 5 at the tip of the evening bolt 5 is assembled. Tighten nut 17 to bc.

Note that a bearing collar 18 that supports a load in the radial direction is fitted to the holding cover 15. In addition, the contact surfaces of the tie bolts 5 and the compressor 3, the compressor 3, the opening shaft 11, the shaft 11 and the rotor 14 described above are roughened by, for example, sand blasting and wire blasting. Surface processing is applied.

Returning to FIG. 1, struts 19 are provided at the inlet 6b of the split casing 6 described above. The casing 2 and the generator casing 20 are connected via the strut 19. This generator casing 20 is composed of end casings 20a, 20b at both ends in the axial direction, and a coil casing 2 located between these end casings 20a, 20b. 0c, and spacers 20d, 20e interposed between the coil casing 20c and the end casings 20a, 20b, respectively. You. These are passed through bolt holes 21f substantially parallel to the tie bolts 5 at predetermined intervals on the outer peripheral side thereof, through bolts 21a, and fastened by nuts 21b.

Radial bearings 22a and thrust bearings 22b are provided on the inner peripheral side of the end casing 20a of the generator 13 and thrust bearings 22c are provided on the inner peripheral side of the spacer 20d. These bearings 22 a to 22 c constitute the bearing of the opening 16 together with the above-mentioned bearing collars 12. A radial bearing 23 is fitted on the inner peripheral side of the spacer 20 e, and the radial bearing 23 also has the same bearing 16 as the above-mentioned bearing collar 18. Configured. With such a bearing structure, the rotor 16 is rotatably supported in the casing 2 and the generator casing 20. Note that this bearing structure shall be a sliding bearing using a working fluid such as an air bearing, a water bearing, or an oil bearing, a rolling bearing, or a magnetic bearing. At this time, if air or water is used as the working fluid of the bearing, corrosive substances such as oxygen, salt, and chlorine may be mixed in the working fluid. The material of the shaft 11 and the cover 15 is preferably a corrosion-resistant alloy such as 12Cr steel, 15Cr steel, an aluminum alloy, or a titanium alloy.

A cylindrical inner casing 24 was fitted on the inner periphery of the coil casing 20 c, and further formed on the inner periphery of the inner casing 24 by winding with a winding. Coil 25 is fitted. The inner peripheral surface of the coil 25 is opposed to the outer peripheral surface of the rotor 14 via a predetermined gap, and the rotor 14 rotates on the inner peripheral side of the coil 25 to generate power. It is supposed to. Therefore, the material of the end cover 14 d of the rotor 16 and the holding cover 15 is preferably a non-magnetic alloy in order to prevent magnetic flux leakage from the permanent magnet 14 b. Here, although not shown in FIG. 1 for the purpose of preventing complexity, in the present embodiment, as shown in FIG. 3, a washing device 26 and a cooling device 27 of the compressor 3 are provided. I have.

FIG. 3 is a diagram schematically illustrating the structures of the cleaning device 26 and the cooling device 27. In FIG. 3, the cleaning device 26 includes a plurality of spray holes 26a provided in the divided casing 6, a cleaning liquid tank 26b and a water storage tank 26c, a cleaning liquid tank 26b and a water storage tank 26c. It is composed of supply pipes 26 d to 26 f connecting the tank 26 c and the injection holes 26 a, and valves 26 g to 26 i provided respectively for these supply pipes 26 d to 26 p. Have been. The cleaning liquid and water stored in the cleaning liquid tank 26b and the water storage tank 26c, respectively, are discharged to the supply pipes 26e and 26f by, for example, a pump (not shown). It has become so. Therefore, when the valves 26 g and 26 h are opened and the valve 26 i is closed, the cleaning liquid in the cleaning liquid tank 26 b flows into the injection port 26 a through the supply pipes 26 e and 26 d. It is guided and injected into the compressor 3. After the cleaning liquid is injected into the compressor 3, the valve 26g and the valve 26i are opened, and when the valve 26h is closed, water is supplied from the water storage tank 26c to the supply pipe 2.

It is guided to the injection hole 26 a through 6 f and 26 d and is injected into the compressor 3. As a result, dust and cleaning liquid adhering to the compressor 3 are washed out with water and removed. At this time, it is efficient to rotate the compressor 3 at a low speed using the generator 13 as a motor.

Although not particularly shown to prevent complication, a drain pipe is provided at the lower part of the split casing 6 (in this case, the lower part in FIG. 1) to drain the cleaning liquid and water. It has become. In the present embodiment, the cleaning device 26 is for cleaning the compressor 3, but may be used for cleaning the turbine 4 or for cleaning both the compressor 3 and the evening bin 4. It is good also as composition.

As shown in FIG. 3, the cooling device 27 includes the water storage tank 26 c, the supply pipe 26 f, the valve 26 i, and the nozzle 2 located near the intake port 6 b of the casing 2.

7a, a supply pipe 27b connecting the nozzle 27a and the supply pipe 26 #, and a valve 27c provided in the supply pipe 27b. As a result, during operation of the gas evening bin power generator, the valves 26 g and 26 h are closed and the valves 26 i and 27 When c is opened, water in the water storage tank 26c is sprayed from the nozzle 27a through the supply pipes 26f and 27b to the vicinity of the intake port 6b.

Returning to FIG. 1 again, the gas turbine power generating device of the present embodiment is provided with a support member 28 that supports the casing 2 so that the axial direction of the tie port 5 rotates in the horizontal direction. ing. The support member 28 is rotatably supported by a boss 30 provided on the divided casing 7 via a pin 29, and is divided by a plurality of (four in this example) stoppers 31. The casing 2 can be fixed in a state in which the casing 2 is sequentially inclined at a predetermined angle (approximately 90 ° in this example). Therefore, the weight of the gas turbine is supported by the pins 29 and the moment is received by the four stoppers 31. The lower end of the support member 28 (in this case, the lower end in FIG. 1) is fixed to a base frame by bolting or welding. In addition, the gas evening bin power generation device in FIG. 1 has a cantilever support structure using the support member 28 as described above. For example, a support member is separately provided at an appropriate position of the generator casing 20 and a plurality of support members are provided. It is good also as a structure supported by.

Here, the procedure of assembling the gas turbine power generator according to the present embodiment will be described below with reference to FIGS.

When assembling the gas turbine power generator of the present embodiment, first, as shown in FIG. 4, a divided casing 7 incorporating an inner casing 9 and a nozzle 9b in advance is provided on a support member 28. Then, it is fixed by the stopper 31 in a state of being substantially vertically inverted so that the axial direction becomes substantially parallel to the gravity. Next, the evening bin 4 and the tie bolts 5 joined to the bin 4 are assembled into the inner casing 9. At this time, for example, a jig such as a spacer is used to keep a predetermined gap between the evening bin 4 and the inner casing 9 or the turbine nozzle 9b.

Next, as shown in FIG. 5, the spacer 8 is overlapped with the flange 7a of the split casing 7 through the tie bolt 5, and the compressor 3 is fitted to the large diameter portion 5a of the tie bolt 5. .

Thereafter, as shown in FIG. 6, the divided casing 6 is overlapped on the spacer 8 through the tie bolts 5, and the casing 2 is fastened by the bolts 10a and the nuts 10b. At this time, the split casing 6 is pre- The end casing 20a of the generator 13 is connected. In this state, the radial bearing 22a and the thrust bearing 22b are fitted to the end casing 20a.

Next, the rotor shaft 11 into which the bearing collars 12 are fitted in advance is passed through the evening elongate 5 and is brought into contact with the compressor 3. Next, a spacer 20d in which the above-mentioned thrust bearing 22c is previously assembled is superimposed on the end casing 20a. Next, a coil casing 20c in which the coil 25 and the inner casing 24 are assembled is superimposed on a spacer 20d, and the rotor 14 assembled in advance is assembled in a tie bolt 5, and Evening shaft 1 1 Then, the retaining cover 15 is assembled into the tie bolt 5, and the spacer 20e having the radial bearing 23 attached thereto is superimposed on the coil casing 20c. Mounting collar 1 8.

Next, the nut 17 is screwed into the screw portion 5 b c of the tie bolt 5. At this time, a predetermined amount of elongation is applied to the tie bolt 5 so that the tie bolt 5 is loaded with pretension, and the nut 17 is tightened, or the nut 17 is fastened with a predetermined tightening torque. When pretension is applied to the tie port 5, as described above, the grip end 4d (see FIG. 2) of the turbine 4 may be gripped with a jig and the screw portion 5bc of the tie bolt 5 may be pulled. Then, the end casing 20b of the generator 13 is overlapped with the spacer 20e, and the generator casing 20 is fastened by the through bolt 21a and the nut 21b. Finally, the split casing 7 is rotated with respect to the support member 28, and the gas turbine is set in a state substantially parallel to the ground so that the axial direction is substantially horizontal as shown in FIG. In this state, the split casing 7 is fixed to the support member 28 by the stopper 31.

Although not particularly described in this assembling procedure, the cleaning device 26 and the cooling device 27 described with reference to FIG. 3, and other devices such as a combustor and a regenerative heat exchanger (not shown) are separately incorporated. In the case of disassembly, the reverse procedure is sufficient. In this case, it is easy to loosen the nut 17 fastened to the evening bolt 5, for example, by applying heat to the tie bolt 5 with a wrench or the like to extend the tie bolt 5.

The basic operation of the gas turbine power generator constructed and assembled as described above is described below. Explain the work.

In FIG. 1 described above, the outside air sucked in through the intake port 6 b is compressed by the rotating blades 3 b by the rotating compressor 3, and the regenerative heat exchanger (FIG. (Not shown). The compressed air is preheated in a regenerative heat exchanger and burned with fuel in a combustor (not shown). The combustion gas from this combustor flows into the flow passage 9a in the casing 2, is rectified by the nozzle 9b, expands in the wing 4b, rotates the turbine 4, and is drawn out from the exhaust 9c. You. The derived combustion gas is led to the regenerative heat exchanger.

As described above, in the generator 13, the rotor 14 rotates at high speed in the coil 25 by the rotational force given to the turbine 4 to generate power. The AC current induced in the coil 25 is converted into a DC current by a rectifier separately provided, and finally converted into an AC current by an inverter.

Hereinafter, effects obtained by the present embodiment will be sequentially described.

(1) Improved reliability of the rotating shaft

In the present embodiment, the tie bolt 5 serving as the rotating shaft of the rotor 16 has a large diameter portion 5a and a small diameter portion 5b. The compressor 3 is assembled into the large-diameter portion 5a joined to the turbine 4, and the shaft 11 and the rotor 14 of the generator 13 are sequentially assembled into the small-diameter portion 5b of the tie bolt 5. It has a configuration. As a result, the part near the evening bin 4 and the compressor 3 of the tie bolt 5 may be exposed to a high-temperature environment, but by increasing the diameter of this part, it can withstand high-speed rotation even in a high-temperature environment. Strength can be secured. In addition, since the rotor shaft 11 and the rotor 14 in a relatively low temperature environment are incorporated into the small diameter portion 5b of the tie bolt 5, the diameter of the shaft hole through which the small diameter portion 5b is inserted can be reduced. As a result, hoop stress acting near the inner diameter of the shaft hole can be reduced. Therefore, since the tie port 5 can be configured to be sufficiently resistant to high-speed rotation, the reliability of the rotating shaft can be sufficiently ensured.

(2) Improvement of joint strength between turbine and tie bolts

In the present embodiment, the evening bin 4 is not provided with a shaft hole through which the tie bolt 5 is inserted, and one end of the large diameter portion 5 a of the evening bolt 5 is joined to the turbine 4. The problem of hoop stress acting on pin 4 does not arise. Further, in the present embodiment, since the connecting boss portion 4c for the tie bolt 5 is provided in the evening bin 4, the connecting portion between the turbine 4 and the tie bolt 5 has substantially the same cross-sectional area as the peripheral portion. There is no change and stress concentration on the joint can be prevented. Therefore, the joining strength between the turbine 4 and the tie bolt 5 can be improved.

Also, since the outer peripheral portion of the joining boss 4c is formed into an R-shaped surface so as to expand toward the disk 4a of the turbine 4, stress on the boundary between the joining boss 4c and the disk 4a is obtained. Concentration can be reduced.

(3) Improvement of disassembly workability and improvement of centering accuracy

In the present embodiment, a support member 28 that is rotatable with respect to the split casing 7 is provided, and during assembly and disassembly, the split casing 7 is turned with respect to the support member 28 so that the split casing 7 is rotated in the axial direction (that is, the tie bolts). 5 in the longitudinal direction) can be substantially vertical. As a result, the workability of assembling and disassembling the gas turbine power generator can be improved, and the centering accuracy of the mouth 16 can be improved. In other words, since the axial direction is substantially vertical during assembly, when assembling the rotor 16 with the compressor 3, the rotor shaft 11, the rotor 14 and the like sequentially incorporated in the tie bolt 5, the opening 16 There is no influence of gravity in the radial direction, and workability is improved, and the center of the rotor 16 can be prevented from being displaced, and the displacement of each device including the rotor 16 in the radial direction can be prevented. The same applies to disassembly.

In the present embodiment, the rotatable support member 28 is used in order to fix the divided casing 7 in a state where the axial direction is substantially vertical, but as long as the same effect is obtained, It is not necessarily limited to such a configuration. For example, the end surface of the split casing 7 on the exhaust port 9c side may be smoothed, and the split casing 7 may be fixed in such a manner that the end face is seated on a surface plate, for example. Similarly, a stand may be provided separately, and the flange 7a of the divided casing 7 may be horizontally received and fixed by the stand. Furthermore, a method of suspending the divided casing 7 with a crane, a wire, or the like in a posture in which the axial direction is substantially vertical, and fixing the divided casing 7 in this state is also conceivable. However, in any case, it is desirable to provide, for example, an auxiliary support member appropriately so that the device does not fall down during the work. (4) Further improvement of rotor centering accuracy

In the present embodiment, the rotor 16 is assembled from a number of components such as the compressor 3, the turbine 4, the tie bolts 5, the rotor shaft 11, the rotor 14, and the like. It is difficult to completely eliminate the amount of deviation from the rotation center of the rotor 16. However, usually, the mouth (rotator) of the micro gas bottle is operated at a high speed of about 400 to 1300 [rpm], and the misalignment of each component When the wind speed became large, the residual unbalance in the sunset was large, and there was a risk that vibration at dangerous speeds would increase. Therefore, it is particularly important to improve the centering accuracy of the rotor in a micro gas turbine.

Therefore, in the present embodiment, the compressor 4 and the tie bolt 5, the compressor 4, the rotor shaft 11, the rotor shaft 11 and the rotor 14 have their respective contact surfaces as tapered surfaces. In this way, by making the contact surfaces of each other tapered surfaces, the tapered surfaces serve as guide surfaces, and the compressor 3, the tie bolts 5, the mouth shafts 11, and the rotors 14 are aligned. , And the amount of residual unbalance during the production of the Rho-Yu 16 can be reduced. At this time, after joining, the turbine 4 and the tie bolt 5 are finally balanced by machining. Therefore, according to the present embodiment, the centering accuracy of the mouth 16 can be further improved.

Further, in the present embodiment, the contact surfaces of the compressor 3 and the tie bolts 5 are configured as tapered surfaces as a whole. However, it is not always necessary that the entire contact surfaces be tapered, It suffices to have a configuration in which the taper surface makes contact.

In addition, as long as the centering accuracy of the mouth 16 is improved, the configuration is not necessarily limited to the configuration in which the contact surface of each component is a tapered surface. It is also conceivable to employ a configuration in which the contact surfaces of the elements are set as a lavette surface. In this case, the same effect can be obtained. The difference between the mouth 16A shown in Fig. 7 and the rotor 16 in Fig. 2 is that the compressor 4 and tie bolts 5, the compressor 4 and the rotor shaft 11, the rotor shaft 11 and the rotor 1 The other configurations are the same in that the contact surfaces in 4 are each a lavette surface.

In the present embodiment, the contact surfaces of the compressor 4 and the tie port 5, the compressor 4 and the rotor shaft 11, the rotor shaft 11 and the rotor 14 are all tapered. (Or lavet surface), but it is essential that at least one of these three contact surfaces be a tapered surface (or lavet surface) even if all the contact surfaces are not tapered surfaces (or lavet surfaces). Surface), the centering accuracy can be improved accordingly.

(5) Improve friction transfer efficiency between components in the mouth

In the present embodiment, as described above, tie bolt 16 presses tie bolt 5 against turbine 4 and incorporates compressor 3, rotor shaft 11, and rotor 14 into tie port 5 for fastening. It is the structure which did. In this structure, the compressor 3, the rotor shaft 11 and the rotor 14 are in contact with the tie bolt 5 and the compressor 3, the compressor 3 and the mouthshaft 11 and the rotor shaft 11 and the rotor 14 respectively. Rotational force is applied by the frictional force acting on the surface. This frictional force is applied by the pressing force due to the tension of the tie bolt 5.

Therefore, when the tie port 5 is heated and extended during operation, the tension of the tie bolt 5 is reduced, and the friction transfer efficiency at each of the contact surfaces may be reduced. In addition, since the mouth 16 rotates at high speed, the compressor 3, the rotor shaft 11, the rotor 14 and the like are subjected to a tensile stress in the radial direction due to centrifugal force. Force acts. Also according to this, the pressing force on each of the contact surfaces may be reduced, and the friction transfer efficiency may be reduced.

In the present embodiment, the above-described contact surfaces are roughened to suppress a decrease in frictional transfer efficiency between the components of the louver 16 even when the tension of the tie bolts 6 is reduced. can do. It should be noted that, as long as the friction transmission efficiency is prevented from lowering in this way, it is not necessary to limit to such a configuration. The tie bolt 5 and the mouth shaft 11, the compressor 3 and the rotor shaft 11, the mouth shaft The opposing end portions of the rotor 11 and the rotor 14 may be formed in a gear shape such as a spline, for example, and may be configured to be fitted to each other.

(6) Prevention of rotor corrosion

In the present embodiment, the opening shaft 11 and the holding cover 15 into which the bearing collars 12 and 18 are fitted, respectively, are molded using a corrosion-resistant alloy, so that the working fluid of the bearing and Corrosion and corrosion pits due to contact with the surface can be prevented. As a result, the reliability of the rotor 16 can be improved. (7) Improved reliability and cost reduction of tieport

In the present embodiment, since the tie port 5 is joined to the bin 4 at night, this joining surface is under a high temperature environment. Usually, materials having high strength at high temperatures, such as nickel-base superalloys, are used as materials for components exposed to such high temperatures. However, the tie bolt 5 is a relatively long part, and the part far from the evening bin 4 is in a relatively low temperature environment, not in a high temperature environment over the entire length. Therefore, if all parts of Typo 5 were formed from expensive nickel-base superalloys, Typo 5 would be of excessive quality and production costs would increase.

Therefore, in the present embodiment, as described above, the tie bolt 5 is configured such that only the connecting portion 5 ba of the large diameter portion 5 a and the small diameter portion 5 b is made of a nickel-based superalloy, and the other portions are iron-based. It consists of the material of. In this way, by taking into account the temperature environment around each part, the tie bolt 5 is formed by joining a plurality of parts made of different materials, thereby reducing the manufacturing cost while securing the reliability of the evening bolt 5. be able to.

(8) Compressor efficiency reduction and corrosion prevention

When sucking outside air from the intake port 6b, it is difficult to completely remove fine dust contained in the intake air at the above-mentioned filter (not shown). For this reason, dust may enter the casing 2 and adhere to the compressor 3 and the turbine 4 to corrode the compressor 3 and the turbine 4 and reduce the compressor efficiency. As a result, power generation efficiency may be reduced.

In the present embodiment, a cleaning device 26 is provided to appropriately remove dust adhering to the compressor 3. Also, of course, the cleaning device 26 is applicable to cleaning of the vials 4. Thereby, corrosion of the compressor 3 and the turbine 4 can be prevented, and a decrease in compressor efficiency can be prevented. As a result, a decrease in power generation efficiency can be suppressed.

(9) Improving power generation efficiency

Since the gas turbine power generation device of the present embodiment is a simple cycle having one stage of the compressor 3 and the turbine 4, it is difficult to increase the compression ratio and the turbine inlet temperature, and the power generation efficiency cannot be improved. Have difficulty.

Therefore, in the present embodiment, a cooling device 27 is provided. Water is sprayed in the vicinity of the intake port 6b of the casing 2 so as to lower the temperature of the outside air taken into the casing 2. As a result, the outside air to be taken in is made denser, and the heat loss in the compression process can be suppressed, so that the heat efficiency can be improved and the power generation efficiency can be improved.

Also, in the present embodiment, the end cover 14 d and the holding cover 15 located at both ends in the axial direction of the permanent magnet 14 b are made of a non-magnetic alloy, so that the magnetic flux leakage in the generator 13 is reduced. As a result, the power generation efficiency can be improved.

In addition, by spraying water near the intake port 6b with the cooling device 27, the combustion air can be made into high humidity air.

(10) Prevent rotor overheating

Since the turbine 4 is constantly in contact with the combustion gas during operation, if the operation time is long, the temperature of the entire mouth 16 gradually rises, causing damage due to creep deformation, thermal fatigue, etc. In some cases, this may reduce the reliability of Law 16. Also, when the temperature rises in this way, the temperature of the permanent magnet 14b in the rotor 14 may exceed one Curie point, and the power generation efficiency may be reduced. The temperature rise of the permanent magnets 14 also includes Joule heat due to the loss of the generator 13.

In the present embodiment, the water supplied from the cooling device 27 is supplied to, for example, the casing 2, the generator casing 20, the coil 25, or a combustor, a regenerative heat exchanger (not shown), or an inverter. By appropriately using cooling water such as the above, overheating of the rotor 16 can be prevented. As a result, a reduction in the reliability of the rotor 16 can be prevented, and a reduction in the power generation efficiency can be prevented. Industrial applicability

According to the present invention, the rotating shaft serving as the rotation center of the turbine and the compressor has a large diameter portion and a small diameter portion. The portion of the rotating shaft that engages with the turbine and the compressor is a large-diameter portion, and the rotor of the generator is incorporated in the small-diameter portion of the rotating shaft. In other words, the rotating shaft has a large diameter in a portion relatively close to the turbine, and can secure sufficient strength to withstand high-speed rotation in a high-temperature environment. Also, the generator Since the rotor, etc., is incorporated in the small-diameter portion of the rotating shaft, the diameter of the shaft hole through which the rotating shaft is inserted can be reduced, so that the hoop stress described above can be reduced and the lifespan can be prevented. can do. Therefore, the reliability of the rotating shaft can be sufficiently ensured.

Claims

The scope of the claims

1. A compressor and a turbine are contained in a casing, the compressor compresses the outside air taken in from an intake port and sends it to a combustor. The combustion gas discharged from the combustor rotates the turbine to generate power. In the gas evening bin power generator,

A rotating shaft having a large diameter portion, both ends of which are engaged with the turbine and the compressor, and a small diameter portion connected to the large diameter portion. Characteristic gas turbine power generator.

2. Casing includes a compressor and an evening bottle, compresses the outside air taken in from the intake port by the compressor, sends it to the combustor, and uses the combustion gas discharged from the combustor to operate the turbine. In a gas turbine power generator that rotates and generates power,

A rotating shaft having a large-diameter portion, both ends of which are engaged with the turbine and the compressor, and a small-diameter portion connected to the large-diameter portion;

A gas turbine power generator, comprising: a support member that supports the casing so that an axial direction of the rotation shaft rotates in a horizontal direction.

3. The gas turbine power generator according to claim 1 or 2, wherein the turbine includes a joining boss for joining the rotating shaft.

4. The gas bin generator according to any one of claims 1 to 3, wherein the compressor has a shaft hole that fits into a large-diameter portion of the rotating shaft, and the shaft of the compressor. A gas turbine power generator, wherein at least a part of a contact surface between the hole and the large-diameter portion is a tapered surface or a rubbed surface.

5. The gas turbine power generator according to any one of claims 1 to 4, further comprising a rotor shaft fitted to a small-diameter portion of the rotating shaft so as to abut on the compressor, wherein the opening and closing shaft is provided. And a gas or pin pin generator, wherein at least a part of the mutual contact surfaces of the compressors is a taper surface or a lavette surface.

6. The gas turbine power generator according to claim 5, further comprising a generator rotor fitted to a small-diameter portion of the rotary shaft so as to abut on the rotor shaft, wherein the rotor and the rotor shaft are mutually connected. A gas turbine power generator, characterized in that at least a part of the contact surface is a tapered surface or a rubbed surface.

7. The gas turbine power generator according to any one of claims 4 to 6, wherein the contact surface is roughened.

8. The gas turbine power generator according to any one of claims 1 to 7, wherein the small-diameter portion of the rotating shaft comprises a plurality of portions made of different materials.

9. The gas turbine power generator according to any one of claims 1 to 8, wherein the port is formed of a corrosion resistant alloy.

10. The gas turbine bin generator according to any one of claims 1 to 9, further comprising a washing device for washing the compressor or the bin.

11. The gas turbine power generator according to any one of claims 1 to 10, further comprising a cooling device that sprays cooling water near an intake port of the casing. Bin power generator.

12. The gas turbine power generator according to claim 11, wherein the cooling water used for the cooling device is used as a refrigerant.

1 3. Casing contains a compressor and a turbine. The compressor compresses the outside air sucked from the intake port and sends it to the combustor. The combustion gas discharged from the combustor In the method of assembling the gas turbine power generation device for generating electric power by rotating the above turbine,

The casing is fixed so that the axial direction of the evening bin is substantially vertical. Within the casing, the turbine and the large diameter portion are joined to the turbine, and the small diameter portion is attached to the large diameter portion. Incorporate the rotating shafts installed in a substantially vertical direction,

A compressor is assembled from the upper end of the small-diameter portion of the rotary shaft, which is substantially vertically upward, and fitted to the upper end of the large-diameter portion of the rotary shaft,

A method for assembling a gas turbine power generation device, comprising sequentially incorporating a rotor shaft and a rotor of a generator into a small-diameter portion of the rotating shaft so as to be stacked on the compressor.