JP2010242552A - Turbine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbine generator capable of positively preventing inner rings of bearings from shifting in a falling out direction from shafts and capable of being smoothly operated. <P>SOLUTION: A nut 40 for fixing an inner ring of a first bearing 11 is screwed on one shaft 2, and a nut 50 for fixing an inner ring of a second bearing 20 is screwed on the other shaft 3. The turbine generator includes: a rotor having shafts on both sides and a turbine provided to one shaft; a turbine housing surrounding and storing the turbine; a stator housing storing a motor stator surrounding the rotor, including the first bearing between itself and the one shaft, and fixed to the turbine housing; and a bearing flange including the second bearing between itself and the other shaft of the rotor and fixed to the stator housing. The nut for fixing the inner ring of the first bearing is screwed on the one shaft, and the nut for fixing the inner ring of the second bearing is screwed on the other shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a turbine generator.

  In recent years, it has been proposed that a turbine generator that generates power using exhaust heat of an internal combustion engine is mounted on a vehicle or the like to effectively use energy.

  As an example of this type of apparatus, as shown in FIG. 2, in an internal combustion engine in which the coolant which has been cooled by the engine 60 is cooled by the radiator 61 and circulated by the pump 62, the upstream side of the radiator 61 is used. A heat exchanger 31 is provided, and a liquid cooling medium is supplied to the heat exchanger 31 by a pump 32 to exchange heat with the high-temperature coolant, and the working fluid generated by vaporizing the cooling medium is Power is generated by the generator M by supplying the turbine 4 of the turbine generator 100, and the low-pressure working fluid after the turbine 4 is rotationally driven is cooled and condensed by the condenser 33, and then liquefied. Some are supplied to the heat exchanger 31.

  For example, Patent Document 1 shows a general technical level of an apparatus using exhaust heat as shown in FIG.

  On the other hand, FIG. 3 is a side sectional view showing an example of an early turbine generator 100 developed by the present inventors. In FIG. 3, reference numeral 1 denotes a rotor having shafts 2 and 3 on both sides. A turbine 4 is integrally fitted to one shaft 2 of 1. Reference numeral 5 denotes a turbine housing formed to receive the turbine 4. The turbine housing 5 has a scroll passage 6 for guiding a working fluid having pressure to the turbine 4, and It has a discharge passage 6a for exhausting the working fluid that has become low pressure after being rotationally driven.

  Reference numeral 7 denotes a stator housing that is integrally assembled with the turbine housing 5 by fixing bolts 8. The stator housing 7 projects toward the inner peripheral side so as to approach the one shaft 2, and the inner peripheral portion approaches the rotor 1. And the turbine housing 5 of the motor stator 10 formed so as to surround the rotor 1 in the motor stator housing portion 10 a formed by the cylindrical projection 9. One end portion on the side (left end portion in the example of FIG. 3) is accommodated and held. Further, a first bearing 11 is disposed between the inner peripheral portion of the cylindrical protrusion 9 and the one shaft 2 so as to rotatably support the one shaft 2. The motor stator 10 includes a stator 12 formed of an inner coil and an outer stator sleeve 13 having an axial length longer than that of the stator 12.

  A plurality of vanes 15 are arranged on the end surface of the stator housing 7 integrally assembled with the turbine housing 5 in the circumferential direction with respect to the nozzle portion 14 that guides the working fluid in the scroll passage 6 to the turbine 4 from the circumferential direction. And a plate 16 for fixing each vane 15 is disposed in the fitting recess, and the plate 16 is sandwiched between the turbine housing 5 and the stator housing 7 by assembling. Yes.

  Reference numeral 17 denotes a bearing flange that is integrally assembled to the stator housing 7 by a fixing bolt 18, and the bearing flange 17 is the other end of the motor stator 10 on the side opposite to the turbine housing 5 (the right end in the example of FIG. 3). A cylindrical projection 19 that protrudes in the axial direction inside the portion of the motor stator 10 so as to hold the other end of the motor stator 10, and further includes an inner peripheral portion of the cylindrical projection 19 and the rotor. A second bearing 20 is disposed between the other shaft 3 and the other shaft 3 so as to rotatably support the other shaft 3. Reference numeral 21 denotes an opening formed so that the other shaft 3 of the bearing flange 17 penetrates to a corresponding position.

  Reference numeral 22 denotes a lid member that is integrally assembled to the bearing flange 17 by a fixing bolt 23. The lid member 22 projects so as to close the opening 21 provided in the bearing flange 17, and is fitted into the opening 21. It has a convex part 24. In FIG. 3, reference numeral 25 denotes seal rings provided between the turbine housing 5 and the stator housing 7, between the outer periphery of the motor stator 10 and the stator housing 7, and between the bearing flange 17 and the lid member 22. The seal material 25 provided between the outer periphery of the motor stator 10 and the stator housing 7 is a supply / exhaust port (with respect to the cooling water passage 7a for the motor stator 10 formed in the stator housing 7). Sealing of cooling water circulated through (not shown) is performed.

  The rotor 1 and the motor stator 10 form a generator M, and the turbine 4 is provided on the same axis of the generator M to form a turbine generator 100. The turbine generator configured in this way According to 100, it is easy to assemble and a compact shape can be obtained.

JP 2008-8224 A

  By the way, in the turbine generator 100 as shown in FIG. 3, during operation, the temperature of each part of the shafts 2 and 3 is in an equilibrium state at a temperature equal to or higher than normal temperature. Since the volume of the rotor 1 side is large and it is difficult to cool and maintains a high temperature, the tip side of the shafts 2 and 3 (on the side of the rotor 1) is small in volume, so it is easy to cool and the temperature is lowered first. Due to the difference in the amount of contraction, the diameters of the distal ends of the shafts 2 and 3 are relatively smaller than those of the proximal ends, and the inner rings of the first bearing 11 and the second bearing 20 are respectively relative to the shafts 2 and 3. Since it is simply press-fitted, the inner rings of the first bearing 11 and the second bearing 20 are moved to the shaft 2 by repeated thermal expansion and contraction of the shafts 2 and 3 due to the operation / stop of the turbine generator 100. The first bearing 1 When there is a possibility that the second bearing 20 does not function smoothly.

  In view of such circumstances, the present invention is intended to provide a turbine generator that can reliably prevent the inner ring of a bearing from shifting in a direction in which it is removed from the shaft, and that can be smoothly operated.

The present invention includes a rotor having shafts on both sides and a turbine provided on one shaft, a turbine housing that surrounds and accommodates the turbine, a motor stator that surrounds the rotor, and the one shaft. A stator housing fixed to the turbine housing with a first bearing therebetween, and a bearing flange fixed to the stator housing with a second bearing between the other shaft of the rotor A turbine generator,
A turbine for fixing an inner ring of the first bearing to the one shaft and a nut for fixing the inner ring of the second bearing to the other shaft. It depends on the generator.

  According to the above means, the following operation can be obtained.

  During operation, the temperature of each part of the one shaft and the other shaft is in an equilibrium state at a temperature equal to or higher than normal temperature, and when stopped, the base end side (rotor side) of each shaft has a large volume so that it is difficult to cool and maintains a high temperature. On the other hand, the tip side (on the rotor side) of each shaft has a small volume, so it is easy to cool down and the temperature becomes lower first. Due to the difference in thermal shrinkage due to this temperature difference, the diameter on the tip side of each shaft is different from the base side. Although relatively small, in the turbine generator of the present invention, a nut for fixing the inner ring of the first bearing is screwed to one shaft, and the inner ring of the second bearing is fixed to the other shaft. Therefore, even if the thermal expansion / contraction of each shaft repeatedly occurs due to the operation / stop of the turbine generator as described above, the inner rings of the first bearing and the second bearing are connected to each shaft. It is possible to prevent the nut from slipping away from the Becomes ability, said first bearing and the second bearing to function smoothly.

  In addition, it is possible to place a cylindrical collar on the one shaft between the inner ring of the first bearing and the turbine instead of a nut. In this case, a member that contacts the turbine is provided. This means that the dimensional tolerance in the axial direction of the collar affects the mounting of the turbine on one shaft, and the tip clearance of the turbine with respect to the inner peripheral surface of the discharge passage of the turbine housing is accurately adjusted. Although it is not preferable because it causes a hindrance in holding, in the turbine generator, if a clearance is secured between the nut screwed to the one shaft and the turbine, the axis of the nut There is no concern that dimensional tolerance in the direction will affect the mounting of the turbine on one shaft, Turbine tip clearance which is effective at any order to accurately hold.

  According to the turbine generator of the present invention, it is possible to surely prevent the inner ring of the bearing from being displaced in the direction of being removed from the shaft, and it is possible to achieve an excellent effect that the operation can be performed smoothly.

It is a sectional side view which shows the Example of this invention. It is a whole schematic block diagram which shows an example at the time of mounting a turbine generator in an internal combustion engine. It is a sectional side view showing an example of the early turbine generator which the present inventors developed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 2 and 3 denote the same components, and the basic configuration is as shown in FIGS. Although the same, the feature of the present embodiment is that, as shown in FIG. 1, a nut 40 for fixing the inner ring of the first bearing 11 is screwed to one shaft 2 and the other shaft 3 is screwed. The nut 50 for fixing the inner ring of the second bearing 20 is screwed.

  In this embodiment, a clearance c is secured between the nut 40 screwed to the one shaft 2 and the turbine 4.

  Next, the operation of the above embodiment will be described.

  During operation, the temperature of each part of the shafts 2 and 3 is in an equilibrium state at a temperature equal to or higher than room temperature, and when stopped, the base end side (rotor 1 side) of the shafts 2 and 3 is large, so it is difficult to cool and maintains a high temperature The tip side of the shafts 2 and 3 (on the side opposite to the rotor 1) has a small volume, so that it is easy to cool down and the temperature becomes low first. In the turbine generator 100 shown in FIG. 1, the nut 40 that fixes the inner ring of the first bearing 11 is screwed to one shaft 2 and the other shaft 3 is relatively small. In addition, since the nut 50 for fixing the inner ring of the second bearing 20 is screwed, the thermal expansion / contraction of the shafts 2 and 3 due to the operation / stop of the turbine generator 100 as described above may occur. The inner rings of the first bearing 11 and the second bearing 20 are detached from the shafts 2 and 3. Be shifted to the direction it is possible to prevent the nuts 40 and 50, said first bearing 11 and second bearing 20 functions smoothly.

  Further, instead of the nut 40, a cylindrical collar can be interposed between the inner ring of the first bearing 11 and the turbine 4 on the one shaft 2. In this case, the turbine 4 This means that the dimensional tolerance in the axial direction of the collar affects the attachment of the turbine 4 to one of the shafts 2, and the inner circumference of the discharge passage 6a of the turbine housing 5 is increased. This is not preferable because it impedes maintaining the tip clearance of the turbine 4 with respect to the surface with high accuracy.

  However, in this embodiment, since a clearance c is secured between the nut 40 screwed to the one shaft 2 and the turbine 4, a dimensional tolerance in the axial direction of the nut 40. However, there is no fear of affecting the attachment of the turbine 4 to one of the shafts 2, and this is effective in accurately maintaining the tip clearance of the turbine 4 with respect to the inner peripheral surface of the discharge passage 6a of the turbine housing 5.

  In this way, it is possible to reliably prevent the inner rings of the first bearing 11 and the second bearing 20 from being displaced in the direction in which they are removed from the shafts 2 and 3, and the operation can be performed smoothly.

  The turbine generator of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotor 2 One axis | shaft 3 The other axis | shaft 4 Turbine 5 Turbine housing 7 Stator housing 10 Motor stator 10a Motor stator accommodating part 11 First bearing 12 Stator 13 Stator sleeve 17 Bearing flange 20 Second bearing 22 Lid member 31 Heat exchange 32 Pump 33 Condenser 40 Nut 50 Nut 60 Engine 61 Radiator 62 Pump 100 Turbine generator M Generator c Clearance

Claims (2)

A rotor having shafts on both sides and provided with a turbine on one shaft, a turbine housing that encloses and accommodates the turbine, and a motor stator that encloses the rotor, and is disposed between the one shaft. A turbine generator having a stator housing having one bearing and fixed to the turbine housing, and a bearing flange having a second bearing between the other shaft of the rotor and fixed to the stator housing. There,
A turbine for fixing an inner ring of the first bearing to the one shaft and a nut for fixing the inner ring of the second bearing to the other shaft. Generator.   The turbine generator according to claim 1, wherein a clearance is secured between a nut screwed on the one shaft and the turbine.

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