JP2013257021A - Drive device and plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device which can eliminate a lubricating oil supply device for supplying oil to bearings for rotating shafts and a reduction gear and also provide a plant.SOLUTION: A first rotating shaft 1 provided to a gas turbine 98 serving as a prime mover and a second rotating shaft 5 provided to a generator 94 serving as a load device are supported in the state of non-contact with each other by a plurality of magnetic bearing devices 95. A rotating power input from the gas turbine 98 (prime mover) into the first rotating shaft is regulated at a predetermined reduction ratio and transmitted to the second rotating shaft 5 by a magnetic gear device 100 which magnetically connects the first rotating shaft 1 and the second rotating shaft 5 so as to drive the generator 94 (load device).

Description

  The present invention relates to a drive device that drives a load device such as a generator or a compressor with a prime mover such as a turbine or an engine, and a plant facility using the drive device.

  For example, in a power generation facility that is a kind of plant facility, the rotational power of a turbine rotor that is a drive shaft provided in a prime mover such as a gas turbine or a steam turbine is generally transmitted to a rotor of a generator that is a load device to generate power. As this kind of thing, patent document 1 describes what connected the turbine rotor of the gas turbine to the generator rotor via the mechanical reduction gear of predetermined gear ratio, for example. Usually, in such a turbine power generation facility, a turbine rotor, a generator rotor, and the like, which are rotating bodies, are supported by a large number of slide bearings. Lubricating oil for reducing friction is used for such sliding bearings and reduction gears, and the lubricating oil stored in the lubricating oil tank is constantly supplied through piping or the like while the rotor is driven.

JP 2003-106171 A

  However, the above-described conventional technology requires a lubricating oil supply tank consisting of a lubricating oil storage tank, piping connecting the storage tank to the slide bearing and speed reducer, and other supplementary notes. It must be done and the cost of the equipment will increase. In addition, the installation period of the equipment is prolonged due to the installation of the lubricating oil supply equipment and the piping work. Further, even if lubricating oil is used, friction loss at the sliding portion of the sliding bearing and the tooth surface of the speed reducer is not a little, and management and replacement of the lubricating oil itself are required.

  The present invention has been made in view of the above, and an object of the present invention is to provide a driving device capable of omitting a lubricating oil supply facility for supplying oil to a bearing and a reduction gear of each rotary shaft and a plant facility using the same. To do.

  (1) In order to achieve the above object, the present invention includes a first rotating shaft provided in a prime mover, a second rotating shaft provided in a load device, the first rotating shaft, and the second rotating shaft. A plurality of magnetic bearing devices that support each other in a non-contact manner, the first rotating shaft and the second rotating shaft are magnetically connected, and a rotational speed input from the prime mover to the first rotating shaft is determined in advance. And a magnetic gear device that adjusts the ratio and transmits it to the second rotating shaft.

  (2) In the above (1), preferably, the magnetic gear device has a plurality of magnets arranged in a circumferential direction on a magnetic force generating surface provided toward the radially outer side of the iron core provided around the axis of the first rotation shaft. A plurality of magnets are arranged in a circumferential direction on a magnetic force generation surface of an iron core provided coaxially surrounding the first magnetic gear and the first magnetic gear arranged opposite to the magnetic force generation surface of the first magnetic gear. The second magnetic gear and a circumferentially arranged fixedly disposed between the opposing magnetic force generation surfaces of the first magnetic gear and the second magnetic gear so as to be interposed between the magnetic poles of the first magnetic gear and the second magnetic gear. A magnetic path member made of electromagnetic steel, a first nonmagnetic structure portion coaxially provided on the axial center side of the plurality of magnets of the first magnetic gear, and a plurality of magnets of the second magnetic gear And a second non-magnetic structure portion coaxially provided on the radially outer side.

  (3) In the above (1), preferably, the magnetic gear device is configured such that a magnetic force generating surface in which a plurality of magnets are arranged in a circumferential direction on an iron core provided around the axis of the first rotating shaft is arranged radially outward. A magnetic force generating surface of an iron core which is provided so as to be coaxially surrounded by the first magnetic gear and is arranged in a circumferential direction around the axis of the second rotating shaft. A second magnetic gear provided radially inward so as to oppose the magnetic force generation surface of the first magnetic gear; and provided between the opposing magnetic force generation surfaces of the first magnetic gear and the second magnetic gear; A holding member that holds a plurality of magnetic path members made of electromagnetic steel in a circumferential direction so as to be interposed between the magnetic poles of the first magnetic gear and the second magnetic gear is provided.

  (4) Further, in the above (1), preferably, the magnetic gear device is a first magnetic gear in which a magnetic force generating surface in which a plurality of magnets are annularly arranged around the axis of the first rotating shaft is directed in the axial direction. And a second side that is provided on the same axis as the first magnetic gear and that has a plurality of magnets arranged annularly around the axis of the second rotation shaft and that faces the magnetic force generation surface of the first magnetic gear Between the magnetic gear and the magnetic force generation surfaces of the first magnetic gear and the second magnetic gear facing each other, the ring is fixed in an annular shape so as to be interposed between the magnets of the first magnetic gear and the second magnetic gear. A plurality of magnetic path members made of electromagnetic steel; and a fixing portion that is provided on a magnetic force generation surface of each of the first magnetic gear and the second magnetic gear and that restrains the magnet from at least the radial outside of each magnetic gear. Shall be.

  (5) In order to achieve the above object, the present invention provides a prime mover and a load device, a first rotation shaft provided in the prime mover, a second rotation shaft provided in the load device, and the first A plurality of magnetic bearing devices that respectively support the first rotating shaft and the second rotating shaft in a non-contact manner, and the first rotating shaft and the second rotating shaft are magnetically connected to each other from the prime mover to the first rotating shaft. A magnetic gear that adjusts the input rotational power according to a predetermined reduction ratio and transmits the rotational power to the second rotary shaft is provided.

  According to the present invention, it is possible to omit the lubricating oil supply facility for supplying oil to the bearings and the speed reducer of each rotary shaft. Therefore, it is possible to omit the cost, installation space, installation period, maintenance work of the lubricating oil supply system, etc. related to the lubricating oil supply equipment, and further reduce friction loss in the lubricated bearings and reducers, There are various effects of preventing a reduction in operating rate due to trouble.

It is a figure which shows schematically the magnetic gear apparatus which concerns on 1st Embodiment, and is sectional drawing in a surface perpendicular | vertical to a rotating shaft. It is a figure which shows schematically the magnetic gear apparatus which concerns on 1st Embodiment, and is sectional drawing in the surface containing a rotating shaft. It is an expanded sectional view which expands and shows the magnetic path member vicinity in FIG. It is a figure which shows an example of a magnetic bearing apparatus schematically, and is a figure which shows typically a mode that the relationship of each structure in a radial bearing part was seen from radial direction. It is a figure which shows an example of a magnetic bearing apparatus schematically, and is a figure which shows typically a mode that the relationship of each structure in a radial bearing part was seen from the axial direction. It is sectional drawing which shows the relationship of each structure in a thrust bearing part. It is a figure which shows the control part which controls operation | movement of a magnetic bearing apparatus, and is a figure which illustrates a part of function of the part which controls a radial bearing part. It is a figure showing the whole gas turbine power generation equipment composition concerning a 1st embodiment. It is a figure which shows the whole structure of the air compression installation which concerns on the modification of 1st Embodiment. It is sectional drawing in the vertical plane containing the axial center line of the magnetic gear apparatus which concerns on 2nd Embodiment. It is an AA arrow directional view in FIG. It is a BB line arrow directional view in FIG. It is CC sectional view taken on the line in FIG. It is the figure which looked at the magnetic gear apparatus which concerns on 2nd Embodiment from the 1st rotating shaft direction. It is a figure which shows the whole structure of the gas turbine power generation equipment which concerns on 2nd Embodiment.

<First Embodiment>
A first embodiment of the present invention will be described with reference to the drawings.

  In the present embodiment, gas turbine power generation equipment will be described as an example of plant equipment.

  FIG. 8 is a diagram showing an overall configuration of the gas turbine power generation facility according to the present embodiment.

  In FIG. 8, the gas turbine power generation facility includes a gas turbine 98 as a prime mover, a generator 94 as a load device, a first rotating shaft 1 provided in the gas turbine 98, and a second turbine provided in the generator 94. The rotating shaft 5, the plurality of magnetic bearing devices 95 that support the first rotating shaft 1 and the second rotating shaft 5 in a non-contact manner, and the first rotating shaft 1 and the second rotating shaft 5 are magnetically connected to each other, and the prime mover And a magnetic gear device 100 for adjusting the rotational power transmitted from the gas turbine 98 to the first rotary shaft 1 with a predetermined reduction ratio and transmitting it to the second rotary shaft 5.

  The gas turbine 98 is compressed by a compressor 90 that compresses the taken-in air to generate compressed air, a combustor 91 that mixes and burns compressed air and fuel from the compressor 90, and combustion gas from the combustor 91. A turbine 92 to be driven, and an intermediate shaft 93 that couples the turbine 92 and the compressor 90 and transmits the rotation of the turbine 92 to the compressor 90 are provided. Further, the compressor 90 of the gas turbine 98 is provided with a bleed air pipe 96 for extracting a part of the compressed air for use in the gas turbine power generation facility, and an adjustment for adjusting the opening degree of the bleed air pipe 96. A drive motor 96b for driving the valve 96a and the regulating valve 96a is provided.

  The first rotary shaft 1 is configured to rotate integrally with the compressor 90, the turbine 92, the intermediate shaft 93, and the like, so that the rotational power from the gas turbine 98 as a prime mover is transmitted. Further, the second rotating shaft 5 is configured to rotate integrally with the rotational power input portion of the generator 94, whereby the rotational power of the second rotating shaft 5 is input to the generator 94. .

  1 and 2 are diagrams schematically showing a magnetic gear device 100 according to the present embodiment, in which FIG. 1 is a cross-sectional view in a plane perpendicular to the rotation axis, and FIG. 2 is a cross-sectional view in a plane including the rotation axis. It is. FIG. 3 is an enlarged cross-sectional view showing the vicinity of the magnetic path member 4 in FIG.

  1 to 3, a magnetic gear device 100 includes a substantially cylindrical input-side magnetic gear 2, a substantially cylindrical output-side magnetic gear 3 disposed so as to surround the input-side magnetic gear 2 coaxially, A plurality of magnetic path members 4 disposed between the input side magnetic gear 2 and the output side magnetic gear 3 are provided. The magnetic path member 4 is held between the input side magnetic gear 2 and the output side magnetic gear 3 by a magnetic path member holder 41. The input side magnetic gear 2, the output side magnetic gear 3, and the magnetic path member holder 41 that holds the magnetic path member 4 are arranged so as to be separated from each other in the radial direction and are configured not to come into contact with each other by rotational driving. (See FIG. 3).

  The input side magnetic gear 2 has a substantially cylindrical shape, and is connected coaxially with the first rotating shaft (input rotating shaft) 1 at one end thereof. The output-side magnetic gear 3 has a substantially cylindrical shape with one end on the second rotation shaft (output rotation shaft) 5 side, that is, the opposite side to the first rotation shaft 1, closed at its closed end. Are connected to the second rotary shaft 5 on the same axis. The first rotating shaft 1 and the second rotating shaft 5 are arranged coaxially, and therefore the input side magnetic gear 2 and the output side magnetic gear 3 are formed coaxially.

  The input-side magnetic gear 2 includes a shaft center portion 21 provided along the axis of the first rotating shaft 1, an iron core 25 disposed so as to cover the outer periphery of the shaft center portion 21, and a peripheral portion in the iron core 25. It comprises a plurality of magnets 24 that are buried side by side in the direction.

  The magnets 24 are provided so as to extend in the axial direction along the axial center portion 21 and are formed by laminating thin plate-shaped permanent magnets insulated from each other in the axial direction. The plurality of magnets 24 formed in this manner are arranged with the N pole 24a and the S pole 24b facing in the circumferential direction. And the adjacent magnet 24 is arrange | positioned in the direction where the mutually same polarity opposes the circumferential direction.

  The iron core 25 is formed by laminating thin plate members (for example, silicon steel plates) insulated from each other in the axial direction.

  In the input side magnetic gear 2 configured as described above, the magnetic lines of force of the adjacent magnets 24 do not go to the opposite side having the same polarity, and most of the lines of magnetic force act radially outward. Therefore, in the input side magnetic gear 2, the outer peripheral surface (surface on the outer side in the radial direction) is a magnetic force generating surface. Further, since the opposite polarities of the adjacent magnets 24 appear on the magnetic force generation surface, the N-pole and S-pole magnetic poles appear alternately in the circumferential direction, and the polarity pair (N-pole and S-pole pair on the magnetic-force generation surface). ) Is half of the number of magnets 24.

  The output side magnetic gear 3 is formed in a substantially cylindrical shape and is arranged coaxially with the input side magnetic gear 2, an iron core 33 arranged so as to cover the inner periphery of the outer structure part 31, and an iron core 33 and a plurality of magnets 32 embedded side by side in the circumferential direction.

  The magnets 32 are provided so as to extend in the axial direction along the outer structure portion 31 and are formed by laminating thin plate-shaped permanent magnets insulated from each other in the axial direction. The plurality of magnets 32 formed in this way are respectively arranged with the N pole 32a and the S pole 32b facing in the circumferential direction. And the adjacent magnet 32 is arrange | positioned in the direction where the mutually same polarity opposes the circumferential direction.

  The iron core 33 is formed by laminating thin plate members (for example, silicon steel plates) insulated from each other in the axial direction.

  In the output side magnetic gear 3 configured as described above, the magnetic lines of force of the adjacent magnets 32 do not go to the opposite side having the same polarity, and most of the magnetic lines of force act radially inward. Therefore, in the output-side magnetic gear 3, the inner peripheral surface (the radially inner surface) is a magnetic force generating surface. Further, since the opposite polarities of the adjacent magnets 24 appear on the magnetic force generation surface, the N-pole and S-pole magnetic poles appear alternately in the circumferential direction, and the polarity pair (N-pole and S-pole pair on the magnetic-force generation surface). ) Is half of the number of magnets 32.

  In each of the input side magnetic gear 2 and the output side magnetic gear 3, the plurality of magnets 24 and 32 on the magnetic force generating surface are weight-calculated and arranged so that the center of gravity in the plane perpendicular to the axis is on the axis. That is, in the input side magnetic gear 2, the weight of the magnet 24 is measured before the placement, and the center of gravity by the magnet 24 is placed on the axis, that is, the rotation center. The same applies to the output side magnetic gear 3.

  The magnetic path member 4 is a resin-made magnetic path (for example, FRP: Fiber Reinforced Plastics, which is a nonmetallic material) formed coaxially between the opposing magnetic force generation surfaces of the input side magnetic gear 2 and the output side magnetic gear 3. It is held by the member holder 41 and arranged in a plurality in the circumferential direction.

  In the magnetic path member holder 41, a plurality of holes extending in the axial direction are provided at equal intervals in the circumferential direction, and thin plate-like electromagnetic steel members insulated from each other are laminated in the holes in the axial direction. The magnetic path member 4 is formed to extend in the axial direction. The magnetic path holder 41 is fixed to the base of the magnetic gear device 100 or the like via a holding portion 43 connected to one end of the first rotating shaft 1 by a bolt 42, whereby the magnetic path member 41 is fixed. It is installed.

  Further, the magnetic path member holder 41 is provided so as to extend in the axial direction between each of the plurality of magnetic path members 4 arranged and fixed in the circumferential direction, and is provided on at least one of the opposing magnetic force generation surfaces. A refrigerant flow path 45 that guides the refrigerant discharged toward the outside is provided. One refrigerant channel 45 is provided between each of the plurality of magnetic path members 4.

  The input side magnetic gear 2 and the output side magnetic gear 3 are held at the end on the second rotating shaft 5 side so as to be slidable in the circumferential direction via a ball bearing 3a. Further, the output side magnetic gear 3 and the magnetic path holder 41 are held at the end on the second rotating shaft 5 side so as to be slidable in the circumferential direction via the ball bearing 2a. That is, the input-side magnetic gear 2, the output-side magnetic gear 3, and the magnetic path holder 41 are held at the end on the second rotating shaft 5 side so as to be slidable in the circumferential direction via the ball bearings 2a and 3a. Therefore, the shift of the central axis between the members is suppressed (see FIG. 2).

  The magnetic force generation surface of the input side magnetic gear 2 and the magnetic force generation surface of the output side magnetic gear 3 in the magnetic gear 100 are magnetically meshed with each other via the magnetic path member 4. When the input side magnetic gear 2 rotates relative to the magnetic path member 4, the opposing surfaces of the magnetic path members 4 facing the input side magnetic gear 2 and the output side magnetic gear 3 are alternately magnetized to N or S poles, The output side magnetic gear 3 is rotationally driven in the circumferential direction by a magnetic attractive force or repulsive force acting between the magnetized magnetic path member 4 and the magnetic force generating surface of the output side magnetic gear 3.

  The relationship between the rotational speed of the first rotating shaft 1 (input-side magnetic gear 2) and the rotational speed of the second rotating shaft 5 (output-side magnetic gear 3) in the magnetic gear device 100 is that on the magnetic force generation surface of the input-side magnetic gear 2. It is determined by the ratio of the logarithm of polarity and the logarithm of polarity on the magnetic force generating surface of the output side magnetic gear 3. As described above, the polarity logarithm on the magnetic force generation surface of the input side magnetic gear 2 is half of the number of magnets 24. Similarly, the polar logarithm on the magnetic force generation surface of the output side magnetic gear 3 is the number of magnets 32. Is half of this. Therefore, the relationship between the rotation speed of the first rotation shaft 1 and the rotation speed of the second rotation shaft 5 is determined by the ratio of the number of magnets 24 of the input side magnetic gear 2 and the number of magnets 32 of the output side magnetic gear 3. It is.

  Here, the rotation speed (input rotation speed) of the first rotation shaft 1 is Nin, the logarithm of the polarity (1/2 of the number of magnets 24) on the magnetic force generation surface of the input side magnetic gear 2 is Xin, and the second rotation shaft 5 , Where Nout is the rotation speed (output rotation speed) and Xout is the polarity logarithm (1/2 of the number of magnets 32) on the magnetic force generation surface of the output-side magnetic gear 3, and the relationship between the input rotation speed Nin and the output rotation speed Nout. Is represented by the following equation.

Nin: Nout = Xout: Xin (1)
For example, as shown in the present embodiment (see FIG. 1 and the like), the logarithm of polarity of the magnetic force generation surface of the input side magnetic gear 2 is 7 and the logarithm of polarity of the magnetic force generation surface of the output side magnetic gear 3 is 17 (see FIG. That is, the number of magnets 24 is 14 and the number of magnets 32 is 34), and the ratio of the input rotation speed Nin to the output rotation speed Nout is 17: 7.

  Further, the transmittable torque between the input side magnetic gear 2 and the output side magnetic gear 3 is increased as the magnetic force of the magnets 24 and 32 (or the respective volumes when the magnetic force per unit volume of the magnets 24 and 32 is constant) increases. To increase. At that time, the iron cores 25 and 33 and the magnetic path member 4 need to have dimensions that do not cause magnetic saturation.

  Further, when the number of magnetic path members 4 is configured to be the sum of the polar logarithm of the magnetic force generation surface of the input side magnetic gear 2 and the polar logarithm of the magnetic force generation surface of the output side magnetic gear 3, the first rotating shaft 1 The torque that can be transmitted to the second rotary shaft 5 is maximized. This knowledge is obtained by simulation using Fourier analysis or the like. For example, as in this embodiment, the polarity logarithm of the magnetic force generation surface of the input side magnetic gear 2 is 7, the polarity logarithm of the magnetic force generation surface of the output side magnetic gear 3 is 17, and the number of magnetic path members 4 is 24. In this case, the transmittable torque between the input side magnetic gear 2 and the output side magnetic gear 3 is maximized.

  4 to 7 are diagrams schematically showing an example of the magnetic bearing device 95. FIG. 4 shows the relationship of each component in the radial bearing portion as viewed from the radial direction, and FIG. 5 shows the state as viewed from the axial direction. FIG. FIG. 6 is a cross-sectional view showing the relationship of each component in the thrust bearing portion.

  The magnetic bearing device 95 includes a radial bearing portion 95A that receives the force acting in the radial direction of the first and second rotating shafts 1 and 5, and a thrust bearing portion 95B that receives the force acting in the axial direction.

  4 and 5, the radial bearing portion 95A of the magnetic bearing device 95 is opposed to the casing 95a provided so as to surround the outer periphery of the rotary shafts 1 and 5, with the rotary shafts 1 and 5 on the inner periphery of the casing 95a being sandwiched therebetween. A plurality of pairs (two pairs in the present embodiment) of electromagnets 95b provided at positions to be positioned, a plurality of position sensors 95c provided in the vicinity of each electromagnet 95b, and the outer peripheral portions of the rotary shafts 1 and 5 A plurality of auxiliary bearings 95d are provided.

  In the present embodiment, there are two pairs of electromagnets 95b, one pair at positions facing each other with the rotary shafts 1 and 5 sandwiched from above and below, and one pair at positions facing each other sandwiching from the side. explain. By supplying a current to the electromagnet 95b, a magnetic field is generated between the electromagnet 95b and the rotating shafts 1 and 5, and the rotating shafts 1 and 5 are attracted and held in the air by the magnetic field.

  FIG. 7 is a diagram showing a control unit 99 that controls the operation of the magnetic bearing device 95. In FIG. 7, the function of a part of part which controls 95 A of radial bearing parts among the control parts 99 is illustrated.

  As shown in FIG. 7, the control unit 99 detects the radial detection positions of the rotary shafts 1 and 5 based on the detection result (detection signal 99d) from the position sensor 95c and the reference position signal (reference signal 99a). By the signal processing unit 99b so that there is no deviation from the reference position, the current supplied from the power amplifier 99c corresponding to each electromagnet 95b is individually controlled, and the strength of the generated magnetic field is controlled. The shafts 1 and 5 are held in the air (reference position) so as not to contact other members such as the casing 95a and the electromagnet 95b. In FIG. 7, the pair of electromagnets 95b provided at positions facing each other with the rotary shafts 1 and 5 sandwiched from above and below has been described. The pair of provided electromagnets 95b is also held in the air (reference position) so as not to contact the other members such as the casing 95a and the electromagnet 95b by performing the same control.

  Note that at least a portion of the rotary shafts 1 and 5 supported by the radial bearing portion 95A of the magnetic bearing device 95 changes its surface magnetic field as it rotates, and eddy current loss occurs. In order to suppress as much as possible, a sleeve having a lamination structure is press-fitted into the rotary shafts 1 and 5.

  The auxiliary bearing 95d is used when the radial shafts 95 are not sufficiently held in the radial direction by the magnetism of the radial bearing portion 95A, for example, before starting or after stopping the electromagnet 95c, or when a malfunction of the device occurs. The auxiliary shafts prevent contact between the rotary shafts 1 and 5 and other components including the electromagnet 95b. The auxiliary bearing 95d is fixed to the casing 95a side, and the gap between the outer periphery of the rotary shafts 1 and 5 and the magnet 95c is about ½ of the air gap between the rotary shafts 1 and 5 and other components. Arranged to hold in between. That is, the auxiliary bearing 95d is configured not to contact the rotating shafts 1 and 5 when the rotating shafts 1 and 5 are normally held (at the reference position) by the magnetic force of the electromagnet 95c.

  In FIG. 6, a thrust bearing portion 95B of the magnetic bearing device 95 includes a casing 95e provided so as to surround the outer periphery of the rotary shafts 1 and 5, and a thrust fixed to the outer peripheral portion of the rotary shafts 1 and 5 in a flange shape. A collar 95g and a pair of electromagnets 95f extending in the circumferential direction at positions opposed to each other with a thrust collar 95g on the inner periphery of the casing 95a in the axial direction, and provided at the ends of the rotary shafts 1 and 5 The position sensor 95h is generally configured.

  The electromagnet 95f is provided at a position facing the thrust collar 95g across the axial direction. By supplying a current to the electromagnet 95f, a magnetic field is generated between the electromagnet 95f and the thrust collar 95g, and the thrust collar 95g, that is, the rotating shafts 1 and 5 on which the thrust collar 95g is fixed are axially moved by this magnetic field. Aspirate and hold.

  The operation control of the thrust bearing portion 95B is also performed in the same manner as the radial bearing portion 95A. That is, the control unit 99 eliminates the deviation between the detected position in the axial direction of the rotary shafts 1 and 5 and the reference position based on the detection result (detection signal) from the position sensor 95h and the reference position signal (reference signal). In this way, the signal processing unit (not shown) performs computation, the current supplied from the power amplifier (not shown) corresponding to each electromagnet 95f is individually controlled, and the strength of the generated magnetic field is controlled to rotate. The movement of the shafts 1 and 5 in the axial direction is suppressed and held at the reference position.

  In the thrust bearing portion 95B, since the electromagnet 95f is installed on the outer side in the radial direction of the rotary shafts 1 and 5, the magnetic field acting on the thrust collar 95g is almost constant, so that almost no eddy current is generated. Therefore, the same high strength alloy steel as that of the oil bearing can be used for the thrust collar 95g.

  The operation of the present embodiment configured as described above will be described.

  First, the timing bearing device 95 is operated by the control unit 99, and the rotary shafts 1 and 5 are held in the air (reference position).

  In this state, the gas turbine 98 (that is, the compressor 90 and the turbine 92) serving as a prime mover is started and the first rotary shaft 1 is rotationally driven to rotationally drive the input-side magnetic gear 2 of the magnetic gear device 100. . When the input-side magnetic gear 2 is rotationally driven, the output-side magnetic gear 3 that is magnetically engaged with the input-side magnetic gear 2 via the magnetic path member 4 is rotationally driven at a rotational speed corresponding to a predetermined reduction ratio. Is done. When the second rotating shaft 5 is rotationally driven by the rotation of the output-side magnetic gear 3, power is generated according to the rotational speed by the generator 94 as a load device.

  The effect of the present embodiment configured as described above will be described.

  For example, in a power generation facility that is a kind of plant facility, the rotational power of a turbine rotor that is a drive shaft provided in a prime mover such as a gas turbine or a steam turbine is generally transmitted to a rotor of a generator that is a load device to generate power. As this type, for example, there is one in which a turbine rotor of a gas turbine is connected to a generator rotor via a mechanical speed reducer having a predetermined gear ratio. Usually, in such a turbine power generation facility, a turbine rotor, a generator rotor, and the like, which are rotating bodies, are supported by a number of slide bearings. Lubricating oil for reducing friction is used for such sliding bearings and reduction gears, and the lubricating oil stored in the lubricating oil tank is constantly supplied through piping or the like while the rotor is driven. However, the conventional technology as described above requires a lubricating oil supply tank consisting of a lubricating oil storage tank, piping connecting the storage tank to the slide bearings and speed reducer, and other supplementary notes. Must be secured widely, and the cost of the equipment also increases. In addition, the installation period of the equipment is prolonged due to the installation of the lubricating oil supply equipment and the piping work. Further, even if lubricating oil is used, friction loss at the sliding portion of the sliding bearing and the tooth surface of the speed reducer is not a little, and management and replacement of the lubricating oil itself are required.

  In contrast, in the present embodiment, a plurality of magnetic bearing devices include a first rotating shaft 1 provided in a gas turbine 98 as a prime mover and a second rotating shaft 5 provided in a generator 94 as a load device. Rotational power input from the gas turbine 98 (prime mover) to the first rotary shaft by the magnetic gear device 100 that is non-contact supported by 95 and magnetically connects the first rotary shaft 1 and the second rotary shaft 5. Since it is configured to adjust the predetermined reduction ratio and transmit it to the second rotary shaft 5 to drive the generator 94 (load device), the lubricating oil supply equipment for supplying oil to the bearings and reducers of each rotary shaft is provided. Can be omitted.

  Therefore, the cost, installation space, installation work period, maintenance work of the lubricating oil supply system, and the like related to the lubricating oil supply facility can be omitted.

  In addition, there are effects of reducing friction loss in bearings and reduction gears, suppressing a reduction in operating rate due to trouble in the lubricating oil supply system, suppressing noise, or suppressing a decrease in life due to wear of parts and the like.

  In addition, some lubricating oils used for mechanical reducers, etc. have a relatively low flash point temperature, and in particular, there may be a need for a fire prevention device corresponding to the lubricating oil. In the embodiment, since the non-contact magnetic bearing device 95 and the magnetic gear device 100 are used, there is no generation of friction and no lubricating oil is required. Therefore, a fire prevention device that is necessary when the lubricating oil is used can be omitted. .

<Modification of the first embodiment>
A modification of the first embodiment of the present invention will be described with reference to the drawings.

  This modification shows the case where the gas turbine power generation facility shown as an example of the plant facility in the first embodiment is an air compression facility using an air compressor instead of the generator. In the drawings of this modification, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof is omitted.

  FIG. 9 is a diagram illustrating an overall configuration of the air compression facility according to the present modification.

  In FIG. 9, the gas turbine power generation facility includes a gas turbine 98 as a prime mover, an air compressor 194 as a load device, a first rotating shaft 1 provided in the gas turbine 98, and a first provided in a generator 94. Magnetically connecting the two rotating shafts 5, the plurality of magnetic bearing devices 95 that support the first rotating shaft 1 and the second rotating shaft 5 in a non-contact manner, and the first rotating shaft 1 and the second rotating shaft 5, The magnetic gear device 100 is configured to adjust the rotational power transmitted from the gas turbine 98 as a prime mover to the first rotary shaft 1 with a predetermined reduction ratio and transmit it to the second rotary shaft 5.

  The gas turbine 98 is compressed by a compressor 90 that compresses the taken-in air to generate compressed air, a combustor 91 that mixes and burns compressed air and fuel from the compressor 90, and combustion gas from the combustor 91. A turbine 92 to be driven, and an intermediate shaft 93 that couples the turbine 92 and the compressor 90 and transmits the rotation of the turbine 92 to the compressor 90 are provided. Further, the compressor 90 of the gas turbine 98 is provided with a bleed air pipe 96 for extracting a part of the compressed air for use in the gas turbine power generation facility, and an adjustment for adjusting the opening degree of the bleed air pipe 96. A drive motor 96b for driving the valve 96a and the regulating valve 96a is provided.

  The first rotary shaft 1 is configured to rotate integrally with the compressor 90, the turbine 92, the intermediate shaft 93, and the like, so that the rotational power from the gas turbine 98 as a prime mover is transmitted. Further, the second rotary shaft 5 is configured to rotate integrally with the rotational power input portion of the air compressor 194, whereby the rotational power of the second rotary shaft 5 is input to the air compressor 194. Is done.

  Other configurations are the same as those of the first embodiment.

  The operation of the present embodiment configured as described above will be described.

  First, the timing bearing device 95 is operated by the control unit 99, and the rotary shafts 1 and 5 are held in the air (reference position).

  In this state, the gas turbine 98 (that is, the compressor 90 and the turbine 92) serving as a prime mover is started and the first rotary shaft 1 is rotationally driven to rotationally drive the input-side magnetic gear 2 of the magnetic gear device 100. . When the input-side magnetic gear 2 is rotationally driven, the output-side magnetic gear 3 that is magnetically engaged with the input-side magnetic gear 2 via the magnetic path member 4 is rotationally driven at a rotational speed corresponding to a predetermined reduction ratio. Is done. When the second rotating shaft 5 is rotationally driven by the rotation of the output side magnetic gear 3, the air compressor 194 as a load device generates and sends compressed air according to the number of rotations.

  Also in this modified example configured as described above, the same effects as those of the first embodiment can be obtained.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to the drawings.

  This embodiment shows a case where the configuration of the magnetic gear device is changed in the gas turbine power generation facility shown as an example of the plant facility in the first embodiment. In the figure of the present embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof is omitted.

  FIG. 15 is a diagram showing an overall configuration of the gas turbine power generation facility according to the present embodiment.

  In FIG. 15, the gas turbine power generation facility includes a gas turbine 98 as a prime mover, a generator 94 as a load device, a first rotating shaft 1 provided in the gas turbine 98, and a second turbine provided in the generator 94. The rotating shaft 5, the plurality of magnetic bearing devices 95 that support the first rotating shaft 1 and the second rotating shaft 5 in a non-contact manner, and the first rotating shaft 1 and the second rotating shaft 5 are magnetically connected to each other, and the prime mover And a magnetic gear device 200 that adjusts the rotational power transmitted from the gas turbine 98 to the first rotary shaft 1 with a predetermined reduction ratio and transmits it to the second rotary shaft 5.

  The gas turbine 98 is compressed by a compressor 90 that compresses the taken-in air to generate compressed air, a combustor 91 that mixes and burns compressed air and fuel from the compressor 90, and combustion gas from the combustor 91. A turbine 92 to be driven, and an intermediate shaft 93 that couples the turbine 92 and the compressor 90 and transmits the rotation of the turbine 92 to the compressor 90 are provided. Further, the compressor 90 of the gas turbine 98 is provided with a bleed air pipe 96 for extracting a part of the compressed air for use in the gas turbine power generation facility, and an adjustment for adjusting the opening degree of the bleed air pipe 96. A drive motor 96b for driving the valve 96a and the regulating valve 96a is provided.

  The first rotary shaft 1 is configured to rotate integrally with the compressor 90, the turbine 92, the intermediate shaft 93, and the like, so that the rotational power from the gas turbine 98 as a prime mover is transmitted. Further, the second rotating shaft 5 is configured to rotate integrally with the rotational power input portion of the generator 94, whereby the rotational power of the second rotating shaft 5 is input to the generator 94. .

  10 is a cross-sectional view of the magnetic gear device 200 in a vertical plane including the axis of the first and second rotating shafts 1 and 5, and FIGS. 11 and 12 are views taken along line AA in FIG. FIG. 13 is a cross-sectional view taken along line CC in FIG. 10, and FIG. 14 is a view of the magnetic gear device 200 viewed from the direction of the first rotation shaft 1. FIG.

  10 to 14, the magnetic gear device 200 includes a substantially disk-like input side magnetic gear 202 and output side magnetic gear 203 arranged on one side of each other so as to face each other, and the input side magnetic gear 202 and the output side magnetic gear. A plurality of magnetic path members 204 disposed between the gears 203, a support 208 for fixing the plurality of magnetic path members 204, and a plate portion 209 for fixing the support 208 to a foundation (not shown).

  The first rotating shaft 1 is connected to the center of one surface of the input side magnetic gear 202 perpendicularly to the surface. As the first rotating shaft 1 rotates, the input side magnetic gear 202 is rotationally driven in the circumferential direction. A plurality of (for example, ten) magnets 232 (for example, permanent magnets) are provided around the axis of the first rotating shaft 1 on the other surface of the input side magnetic gear 202, that is, the surface facing the output side magnetic gear 203. It is provided in an annular shape (see FIG. 11).

  The output side magnetic gear 203 is configured in the same manner as the input side magnetic gear 202. That is, the second rotating shaft 5 is connected to the center of one surface of the output side magnetic gear 203 perpendicularly to the surface, and the second rotating shaft is rotated by rotating the output side magnetic gear 203 in the circumferential direction. 5 is driven to rotate. On the other surface of the output-side magnetic gear 203, that is, the surface facing the input-side magnetic gear 202, a plurality of (for example, 14) magnets 224 (for example, permanent magnets) are arranged around the axis of the second rotating shaft 5. It is provided in an annular shape (see FIG. 12).

  In the input side magnetic gear 202 and the output side magnetic gear 203, the magnets 224 and 232 are arranged such that the distance (radius) from the axis to the plurality of magnets 224 is the same as the distance (radius) from the axis to the plurality of magnets 232. Has been. Moreover, the 1st rotating shaft 1 and the 2nd rotating shaft 5 are arrange | positioned coaxially. Therefore, the opposed state of the magnet 224 and the magnet 232 is maintained regardless of the circumferential relative positions of the input side magnetic gear 202 and the output side magnetic gear 203.

  The surface of the input side magnetic gear 202 provided with the magnet 224 and the surface of the output side magnetic gear 203 provided with the magnet 232 are referred to as a magnetic force generation surface.

  The magnets 224 and 232 are fixed by being fitted into magnet fixing grooves provided around the axis and in an annular shape around the axis on the magnetic force generation surfaces of the input side magnetic gear 202 and the output side magnetic gear 203. The input side magnetic gear 202 and the output side magnetic gear 203 are configured such that the distance (radius) from the axis to the magnet fixing groove is the same. The magnets 224 and 232 and the magnet fixing groove are formed in a trapezoidal shape in which a cross section cut along a plane including the axis of the first rotating shaft 1 and the second rotating shaft 5 is reduced in diameter toward the magnetic path member 204. The magnets 224 and 232 are fixed to the magnet fixing groove by contacting with a surface corresponding to the lower base and the hypotenuse in the trapezoidal cross section. In particular, the portion of the input side magnetic gear 202 and the output side magnetic gear 203 on the outer side in the radial direction when viewed from the magnet fixing groove constitutes a fixing portion that restrains the magnets 224 and 232 from the outer side in the radial direction. Thereby, for example, the radial movements of the magnets 224 and 232 due to the centrifugal force acting by the rotation of the input side magnetic gear 202 and the output side magnetic gear 203 can be restricted. Further, the magnets 224 and 232 are arranged such that the magnetic poles are directed in the axial direction, and when viewed from the axial direction, the N poles and the S poles are arranged alternately in the circumferential direction. The magnets 224 and 232 may be configured by laminating plate-shaped magnets in the axial direction, the circumferential direction, or the radial direction. Thereby, the eddy current generated in the magnets 224 and 232 can be suppressed.

  The support 208 is formed in a plate shape and is disposed so as to be orthogonal to the axis, and is provided with a circular hole centered on the axis. The support 208 is made of a non-metal (non-magnetic material) such as a resin, and is not easily affected by the magnetic field generated by the magnets 224 and 232. Accordingly, the force acting on the support 208 and the generated eddy current can be suppressed by the magnetic field generated by the magnets 224 and 232.

  The magnetic path member 204 is a rod-shaped member. Although the cross-sectional shape is not limited, For example, it has cross-sectional shapes, such as a rectangle (square) and a circle. One end of the magnetic path member 204 is connected (embedded) inside the hole of the support 208, and the other end is arranged in the radial direction. The plurality of magnetic path members 204 are arranged at equal intervals inside the hole of the support 208. That is, the plurality of magnetic path members 204 are annularly arranged around the axis and are arranged at equal intervals in the circumferential direction.

  The distance (radius) from the axis to each magnetic path member 204 is set to be the same as the distance (radius) from the axis to the magnet 224 or magnet 232, and therefore the magnetic path member 204 is It arrange | positions so that it may be located between the magnet 224 and the magnet 232.

  The magnetic path member 204 is formed by laminating silicon steel plates whose surfaces are insulated in the circumferential direction or the radial direction. Thereby, the eddy current which generate | occur | produces by the change of the magnetic field of the rotating shafts 1 and 5 can be suppressed. When importance is attached to the strength against the circumferential rotational torque load generated by the magnetic field from the magnets 224 and 232, the magnetic path member 204 may be formed by laminating silicon steel plates in the axial direction.

  As shown in FIG. 10, the magnetic force generation surface of the input side magnetic gear 202 and between the magnet 224 and the magnetic path member 204, and the magnetic force generation surface of the output side magnetic gear 203 and between the magnet 232 and the magnetic path member 204. Are provided in a non-contact manner with a gap. The magnetic path member 204 transmits a magnetic field between the magnet 224 and the magnet 232 to each other, and the input side magnetic gear 202 and the output side magnetic gear 203 are magnetically engaged via the magnetic path member 204.

  The relationship between the rotational speed of the input-side magnetic gear 202 and the rotational speed of the output-side magnetic gear 203 of the magnetic gear device 200 is determined by the ratio of the number of magnets 224 and 232. The rotation speed (input rotation speed) of the first rotation shaft 1 (input side magnetic gear 202) is Nin, the number of magnets 224 provided in the input side magnetic gear 202 is Xin, and the second rotation shaft 5 (output side magnetic gear 203). ) Is Nout, and the number of magnets 232 provided on the output-side magnetic gear 203 is Xout, the relationship between the input rotation speed Nin and the output rotation speed Nout is expressed by the following equation.

Nin: Nout = Xout: Xin (2)
For example, as shown in the present embodiment, if the number of magnets 224 is 10 (see FIG. 11) and the number of magnets 232 is 14 (see FIG. 12), the ratio between the input rotation speed Nin and the output rotation shaft Nout is 14:10.

  The transmittable torque between the input side magnetic gear 202 and the output side magnetic gear 203 increases as the number of magnets 224 and 232 increases. Further, the transmittable torque between the input side magnetic gear 202 and the output side magnetic gear 203 is determined by the relationship between the number of polar pairs of the magnets 224 and 232 and the number of magnetic path members 204. The polarity pair is a set of N and S poles arranged adjacent to each other in each of the magnets 224 and 232 arranged in an annular shape on the magnetic force generating surfaces of the input side and output side magnetic gears 202 and 203. The polar logarithm is the number of pairs of N and S poles.

  When the number of magnets 224 and 232 is constant, the number of magnetic path members 204 is configured to be the sum of the polar logarithm of magnet 224 and the polar logarithm of magnet 232. The torque that can be transmitted to the rotating shaft 5 is maximized. This knowledge is obtained by simulation using Fourier analysis or the like. For example, when the number of polar pairs of the magnet 224 is 5 (the number of magnets 224 is 10) and the number of the polar pairs of the magnet 232 is 7 (number of magnets 232 is 14), the number of the magnetic path members 204 is 12. The transmittable torque between the input side magnetic gear 202 and the output side magnetic gear 203 is maximized.

  Other configurations are the same as those of the first embodiment.

  The operation of the present embodiment configured as described above will be described.

  First, the timing bearing device 95 is operated by the control unit 99, and the rotary shafts 1 and 5 are held in the air (reference position).

  In this state, the gas turbine 98 (that is, the compressor 90 and the turbine 92) as a prime mover is started and the first rotary shaft 1 is driven to rotate, thereby driving the input side magnetic gear 202 of the magnetic gear device 200 to rotate. . When the input-side magnetic gear 202 is rotationally driven, the output-side magnetic gear 203 that is magnetically engaged with the input-side magnetic gear 202 via the magnetic path member 204 is rotationally driven at a rotational speed corresponding to a predetermined reduction ratio. Is done. When the second rotating shaft 5 is rotationally driven by the rotation of the output side magnetic gear 203, power is generated according to the rotational speed by the generator 94 as a load device.

  Also in the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 1st rotating shaft 2,202 Input side magnetic gear 3,203 Output side magnetic gear 4,204 Magnetic path member 5 Output rotating shaft 24,32,224,232 Magnet 25,33 Iron core 41 Magnetic path member holder 43 Holding part 90 Compressor 91 Combustor 92 Turbine 93 Intermediate shaft 94 Generator 95 Magnetic bearing 96 Extraction air pipe 100, 200 Magnetic gear device

Claims (5)

A first rotating shaft provided in the prime mover;
A second rotating shaft provided in the load device;
A plurality of magnetic bearing devices for supporting the first rotating shaft and the second rotating shaft in a non-contact manner;
The first rotating shaft and the second rotating shaft are magnetically connected, and the rotational power input from the prime mover to the first rotating shaft is adjusted with a predetermined reduction ratio and transmitted to the second rotating shaft. And a magnetic gear device. The rotary drive device according to claim 1, wherein
The magnetic gear device includes:
A first magnetic gear in which a plurality of magnets are arranged in a circumferential direction on a magnetic force generation surface provided toward the radially outer side of the iron core provided around the axis of the first rotation shaft;
A second magnetic gear provided coaxially surrounding the first magnetic gear and having a plurality of magnets arranged in a circumferential direction on a magnetic force generating surface of an iron core facing the magnetic force generating surface of the first magnetic gear;
Made of electromagnetic steel fixedly arranged in the circumferential direction so as to be interposed between the magnetic poles of the first magnetic gear and the second magnetic gear between the opposing magnetic force generation surfaces of the first magnetic gear and the second magnetic gear. A magnetic path member;
A first non-magnetic structure part coaxially provided on the axial center side of the plurality of magnets of the first magnetic gear;
A rotary drive device comprising: a second non-magnetic structure portion coaxially provided on a radially outer side of the plurality of magnets of the second magnetic gear. The rotary drive device according to claim 1, wherein
The magnetic gear device includes:
A first magnetic gear provided with a plurality of magnets arranged in a circumferential direction on an iron core provided around the axis of the first rotating shaft and having a magnetic force generation surface facing radially outward;
The magnetic force generating surface of the iron core, which is provided coaxially surrounding the first magnetic gear and has a plurality of magnets arranged in the circumferential direction around the axis of the second rotating shaft, faces the magnetic force generating surface of the first magnetic gear. A second magnetic gear provided radially inward as described above,
A plurality of magnetic path members made of electromagnetic steel are provided between the opposing magnetic force generation surfaces of the first magnetic gear and the second magnetic gear and are interposed between the magnetic poles of the first magnetic gear and the second magnetic gear. A rotation drive device comprising: a holding member that is arranged and held in a circumferential direction. The rotary drive device according to claim 1, wherein
The magnetic gear device includes:
A first magnetic gear having a plurality of magnets arranged in a ring around the axis of the first rotation axis and having a magnetic force generation surface directed in the axial direction;
A second-side magnetic gear provided coaxially with the first magnetic gear and having a plurality of magnets arranged annularly around the axis of the second rotation shaft so as to face the magnetic force generation surface of the first magnetic gear When,
Made of electromagnetic steel fixed annularly between the magnets of the first magnetic gear and the second magnetic gear between the opposing magnetic force generation surfaces of the first magnetic gear and the second magnetic gear. A plurality of magnetic path members;
A rotary drive device comprising: a fixing portion that is provided on a magnetic force generation surface of each of the first magnetic gear and the second magnetic gear and that restrains the magnet from at least the radial outer side of each magnetic gear. Prime mover and load equipment,
A first rotating shaft provided in the prime mover;
A second rotating shaft provided in the load device;
A plurality of magnetic bearing devices for supporting the first rotating shaft and the second rotating shaft in a non-contact manner;
The first rotating shaft and the second rotating shaft are magnetically connected, and the rotational power input from the prime mover to the first rotating shaft is adjusted according to a predetermined reduction ratio, and the second rotating shaft A plant equipment comprising a magnetic gear device for transmitting to a plant.

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