CN110966048A - Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle - Google Patents

Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle Download PDF

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Publication number
CN110966048A
CN110966048A CN201911374637.6A CN201911374637A CN110966048A CN 110966048 A CN110966048 A CN 110966048A CN 201911374637 A CN201911374637 A CN 201911374637A CN 110966048 A CN110966048 A CN 110966048A
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China
Prior art keywords
rotor
blade
gear
shaft
hemispherical
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CN201911374637.6A
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Chinese (zh)
Inventor
李超
宾光富
周治港
张亮
姜璟珺
李鸿光
王维民
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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Priority to CN201911374637.6A priority Critical patent/CN110966048A/en
Publication of CN110966048A publication Critical patent/CN110966048A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D7/00—Rotors with blades adjustable in operation; Control thereof
    • F01D7/02—Rotors with blades adjustable in operation; Control thereof having adjustment responsive to speed

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a turbine mechanical rotor system blade group inclination and spin angle accurate adjusting device, which comprises a brake motor, a rotor driving mechanism and a blade shaft, wherein the rotor is arranged on the brake motor; at least one end of the rotor is provided with a brake motor; a rigid cam is arranged on a speed reducing shaft connected with a brake motor, a flexible gear is connected with a motor connecting seat, an outer gear ring is arranged at the end, facing the rigid cam, of the flexible gear, and a flexible bearing is arranged between the outer gear ring and the rigid cam; the blade shaft is supported in the rotor through a bearing; the end part of the speed reduction hemispherical gear on the blade shaft is provided with an inner gear ring which is meshed with an outer gear ring on the flexible gear; the rotor is provided with a plurality of blades, and the inner ends of the blades are provided with adjusting hemispherical gears which are meshed with the speed reducing hemispherical gears respectively. The invention provides methods for designing the inclination of blades, designing a large reduction ratio, driving hemispherical gears and independently driving blade adjusting devices and the like, and can realize the online and accurate adjustment of the self-rotating angle of a blade group in the inclination and high-speed operation processes of the blade group of a rotor system.

Description

Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle
Technical Field
The invention belongs to the field of turbomachinery, and particularly relates to a device for accurately adjusting the inclination and spinning angles of a blade group of a turbomachinery rotor system.
Background
The blade is a core component for realizing energy conversion of a turbine mechanical rotor system such as an aircraft engine, a gas turbine, an air compressor and the like, and the efficient and stable operation of the blade under long period, variable working condition and wide rotating speed has great significance for the safe service of a unit. The problem of strong nonlinear vibration of blades caused under the condition of limiting thermo-fluid-solid coupling in space always restricts the development of turbomachinery to high parameter, high capacity and intellectualization, and can lead to blade fatigue fracture in severe cases to cause self-excited vibration of a unit, thereby causing serious economic loss and even casualties for enterprises.
At present, the domestic and foreign research on the blade angle adjustment of the rotor system of the turbomachine mainly comprises the following four methods, the first method is to manually adjust the blade angle after the shutdown, the method causes the reduction of the operation efficiency of a unit, improves the economic cost of enterprises, cannot research the dynamic continuous influence of the blade angle change on the aerodynamic performance of the rotor system, and has obvious defects. And the second method uses a screw rod nut as a transmission mechanism, combines a guide slide rod, converts the rotary motion of a motor into plane movement, and realizes the angle adjustment of the blade by utilizing an eccentric principle. The third type directly adopts the hydraulic pressure or the pneumatic mode that combines the guide rail structure to generate the output motion, utilizes the eccentric principle to realize the blade angle modulation equally. And fourthly, a bevel gear, a face gear or a worm and gear mechanism is adopted to convert the axial rotary motion of the motor into radial blade rotary motion to realize angle adjustment. Although the second, third and fourth methods can conveniently achieve the purpose of adjusting the blade angle, the method directly adopts a motor as power input, cannot realize accurate adjustment of the blade group spin angle and combined adjustment of the different-stage rotor blade group spin angles, cannot realize axial tilt adjustment of the blade group, cannot effectively diagnose the fault of vibration overrun caused by axial tilt of the blade group, and is limited in application occasions.
Therefore, the invention provides a turbine mechanical rotor system blade group inclination and spin angle accurate adjusting device by combining methods of blade group inclination design, large reduction ratio design, hemispherical gear transmission, independent driving of a blade adjusting device and the like, and can realize blade group axial inclination adjustment, wherein the minimum angle of blade axial inclination is 7 degrees, the minimum angle of spin angle adjustment can reach 3 degrees, the angles of different stages of rotor blade groups can be synchronously adjusted or randomly combined and adjusted according to actual needs, so as to research the internal association between the fatigue damage of the blade groups, the dynamic change of the assembly tiny spin angle and the pneumatic performance of a rotor system, and have engineering significance for blade group fault diagnosis, blade group assembly angle optimization design, improvement of the vibration response of the blade groups under continuous non-steady airflow excitation and improvement of the energy conversion efficiency of a turbine mechanical rotor system.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the adjusting device for the inclination and the spin angle of the blade group of the turbine mechanical rotor system is accurate, synchronous or randomly combined so as to research the internal correlation between the axial inclination fault diagnosis of the blade group, the dynamic change of the micro spin angle of the blade group assembly and the aerodynamic performance of the rotor system.
The technical scheme adopted by the invention is as follows: a turbine mechanical rotor system blade group inclination and spin angle accurate adjusting device comprises a brake motor, a rotor driving mechanism and a blade shaft; the rotor is of a cylindrical structure, and at least one end of the rotor is provided with a brake motor; the output shaft of the brake motor is connected with the speed reducing shaft, the speed reducing shaft is provided with a rigid cam, and the rigid cam is in interference fit with the speed reducing shaft and is axially positioned through a shaft shoulder; the flexible gear is connected with the rotor through a bolt, an outer gear ring is arranged at the end, facing the rigid cam, of the flexible gear, the outer gear ring is positioned on the outer side of the rigid cam, and a flexible bearing is arranged between the outer gear ring and the rigid cam; the blade shaft is supported in the rotor through a bearing, a speed-reducing hemispherical gear is fixedly mounted on the blade shaft, an inner gear ring is arranged at the end part of the speed-reducing hemispherical gear, and the inner gear ring is meshed with an outer gear ring on the flexible gear; the rotor is provided with a plurality of blades through an inclination angle adjusting device, and the blades are positioned in the same section and are uniformly arranged along the circumferential direction; the inner ends of the blades are provided with adjusting hemispherical gears, and the adjusting hemispherical gears of the blades are respectively meshed with the speed reducing hemispherical gears.
In the device for accurately adjusting the inclination and the spinning angle of the blade group of the rotor system of the turbomachinery, the rotor comprises a primary rotor and a secondary rotor, the primary rotor and the secondary rotor are coaxial, and one opposite ends of the primary rotor and the secondary rotor are connected through a bolt; two ends of the rotor are respectively provided with a motor connecting seat, and a brake motor is respectively arranged in the two motor connecting seats; each brake motor is connected with a speed reducing shaft; a group of blades are respectively arranged on the first-stage rotor and the second-stage rotor; a blade shaft is respectively arranged in the first-stage rotor and the second-stage rotor, and a speed-reducing hemispherical gear meshed with the adjusting hemispherical gear of the corresponding blade group on the first-stage rotor or the second-stage rotor is respectively arranged on the two blade shafts; the speed reducing semi-spherical gears on the two blade shafts are respectively and fixedly provided with an inner gear ring, and the inner gear rings on the two speed reducing semi-spherical gears are respectively meshed with the outer gear rings of the flexible gears on the corresponding speed reducing shafts.
In the accurate blade group inclination and spinning angle adjusting device for the rotor system of the turbomachinery, the rotor driving mechanism comprises a driving motor, a driving belt wheel, a driven belt wheel, a synchronous belt and an expansion sleeve; the driving belt wheel is arranged on an output shaft of the driving motor, the driven belt wheel is arranged on the rotor through the expansion sleeve, and the driving belt wheel is connected with the driven belt wheel through the synchronous belt.
In the accurate blade group inclination and spinning angle adjusting device for the rotor system of the turbomachinery, the brake motor is electrically connected with the electrified slip ring; the flexible bearing adopts a thin-wall deep groove ball bearing.
In the accurate adjusting device for the inclination and the spin angle of the blade group of the rotor system of the turbine machine, the inclination angle adjusting device comprises an adjusting tapered roller bearing, an open snap ring, a ball head, a clamping groove and an end cover; the rotor is provided with a circular through hole at the blade mounting position, and the end cover covers the outer end of the circular through hole; the adjusting tapered roller bearing is arranged in the circular through hole, the inner wall of the inner ring is a spherical surface, and the spherical surface is matched with the ball head to form a spherical hinge structure; the ball head is arranged on the blade, a plurality of annular clamping grooves are formed in the ball head, different included angles are formed between the plane where the annular clamping grooves are located and the plane where the adjusting tapered roller bearing is located, an opening clamping ring is arranged on the outer end face of the inner ring of the adjusting tapered roller bearing, and the opening clamping ring is matched with the clamping grooves in the ball head to fix the angle of the blade.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can realize the inclination angle adjustment of the rotor system blade group, the maximum inclination angle can be 39 degrees, the minimum adjustable inclination angle can be 7 degrees, and the axial inclination fault generated by the blade group due to the sudden external excitation can be effectively diagnosed.
2. The invention combines the design of large reduction ratio and the hemispherical gear transmission method, realizes the on-line adjustment mode that the minimum spin angle of the blade group is 3 degrees, and compared with other devices which directly use the rotating speed output of the motor as power to adjust the spin angle, the invention has more accurate adjustment on the spin angle of the blade group of the turbine machine, and is beneficial to researching the internal association between the dynamic change of the tiny spin angle assembled by the blade group and the pneumatic performance of a rotor system.
3. The blade adjusting device is independently driven, can realize synchronous adjustment of the self-rotating angle of the blade group, can also realize random combined adjustment of the self-rotating angles of the blade groups of the primary rotor and the secondary rotor according to actual requirements, widens the application range, and better meets the actual requirements of engineering.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of a blade pitch adjustment apparatus of the present invention.
In fig. 1: the device comprises an electrified slip ring 1, a brake motor 2, a motor connecting seat 3, a coupler 4, a supporting deep groove ball bearing 5, a primary rotor 6, a flexible wheel 7, a rigid cam 8, a flexible bearing 9, an inner gear ring 10, a speed reducing hemispherical gear 11, an adjusting hemispherical gear 12, an inclination angle adjusting device 13, a blade 14, a sleeve 15, a medium deep groove ball bearing 16, a secondary rotor 17, a driven pulley 19, an expansion sleeve 20, a synchronous belt 21, a driving pulley 22, an alternating current variable frequency motor 23, a primary blade shaft 24 and a speed reducing shaft 25.
In fig. 2: 13-1 is an adjusting tapered roller bearing, 13-2 is an open snap ring, 13-3 is a ball head, 13-4 is a clamping groove, and 13-5 is an end cover.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention includes two brake motors, a rotor driving mechanism and a vane shaft; the rotor include one-level rotor 6 and second grade rotor 17, one-level rotor 6 and second grade rotor 17 are coaxial, and relative one end passes through bolted connection, and the rotor is the tubular structure. The two ends of the rotor are respectively provided with a motor connecting seat 3, two brake motors 2 are respectively arranged in the two motor connecting seats 3, the two brake motors 2 are respectively electrically connected with the two electrified sliding rings 1, and the electrified sliding rings 1 supply power. The output shafts of the two brake motors 2 are respectively connected with a speed reducing shaft 25 through a coupler 4. The speed reducing shaft 25 is provided with a rigid cam 8, and the rigid cam 8 is in interference fit with the speed reducing shaft 25 and is axially positioned through a shaft shoulder. The two motor connecting seats 3 are connected with the flexible gear 7 through bolts, the end, facing the rigid cam 8, of the flexible gear 7 is provided with an outer gear ring, the outer gear ring is positioned on the outer side of the rigid cam 8, a flexible bearing 9 is arranged between the outer gear ring and the rigid cam 8, and the flexible bearing 9 adopts a thin-wall deep groove ball bearing. The first-stage rotor 6 and the second-stage rotor 17 are respectively provided with a blade shaft 24, one end of the blade shaft 24 is arranged at one end of a speed reducing shaft 25 through a supporting deep groove ball bearing 5, and the other end of the blade shaft 24 is supported in the rotors through an intermediate deep groove ball bearing 16. A group of blades 14 are respectively arranged on the first-stage rotor 6 and the second-stage rotor 17; the blades of each set 14 are located in the same plane and are mounted on the rotor by pitch adjustment means 13. Each blade is provided with an adjusting hemispherical gear 12, and the blade shaft 24 is respectively provided with a speed-reducing hemispherical gear 11 which is meshed with the adjusting hemispherical gear 12 of the corresponding blade group on the primary rotor 6 or the secondary rotor 17. An inner gear ring 10 is fixedly arranged on the end surface of the speed reduction hemispherical gear 11, and the inner gear ring 10 is meshed with an outer gear ring of the flexible gear 7 on the corresponding motor connecting seat 3.
The rotor driving mechanism comprises an alternating current variable frequency motor 23, a driving belt wheel 22, a driven belt wheel 19, a synchronous belt 21 and an expansion sleeve 20; the driving pulley 22 is installed on the output shaft of the driving motor 23, the driven pulley 19 is installed on the rotor through the expansion sleeve 20, and the driving pulley 22 is connected with the driven pulley 19 through the synchronous belt 21. The alternating current frequency conversion 23 is started, and the rotor can be driven to rotate through the synchronous belt 21.
As shown in fig. 2, the inclination angle adjusting device 13 includes an adjusting tapered roller bearing 13-1, a snap ring 13-2, a ball head 13-3, a slot 13-4 and an end cover 13-5; the rotor is provided with a circular through hole at the installation position of the blade 14, the end cover 13-5 covers the outer end of the circular through hole, and the blade extends out of the central hole of the end cover 13-5. The adjusting tapered roller bearing 13-1 is arranged in the circular through hole, the inner wall of the inner ring of the adjusting tapered roller bearing 13-1 is a spherical surface, and the spherical surface is matched with the ball head 13-3 to form a spherical hinge structure. The ball head 13-3 is mounted on the blade 14, the ball head 13-3 is provided with a plurality of annular clamping grooves 13-4, planes where the plurality of annular clamping grooves 13-4 are located and planes where the adjusting tapered roller bearing 13-1 is located form different included angles, the outer end face of the inner ring of the adjusting tapered roller bearing 13-1 is provided with an open clamping ring 13-2, the open clamping ring 13-2 is matched with one clamping groove in the ball head 13-3 to fix the angle of the blade 14 and match with different clamping grooves 13-4 to adjust the included angle of the blade 14 and the axis of the rotor.
During the specific operation of the invention, firstly, the relative positions of the split snap ring 13-2 and the annular clamping groove 13-4 are changed according to the actual requirement to realize the inclination of the blades, then the alternating current variable frequency motor 23 is started to drive the primary rotor 6 and the secondary rotor 17 to rotate, the brake motor 2 keeps the brake state, and when the self-rotating angle of the blades is adjusted, the rotating time of the brake motor 2 is calculated according to the following formula:
Figure 177334DEST_PATH_IMAGE002
(ii) a In the formula:α isThe angle at which the blades 14 are spun is,nin order to brake the rotational speed of the motor 2,I 34 for reducing the speed of the hemispherical gear 11 and adjusting the transmission ratio of the hemispherical gear 12;I 12 is the transmission ratio of the outer gear ring and the inner gear ring 10 of the flexible gear 7.
After the adjustment is finished, an instruction is sent to the brake motor 2 to keep the brake state again, and the blade 14 is ensured to stably and reliably run at the adjusted angle. If the self-rotating angles of the blades on the primary rotor and the secondary rotor are the same, synchronous adjustment of the self-rotating angles of the blades 14 on the primary rotor and the secondary rotor can be achieved, and if the self-rotating angles of the blades on the primary rotor and the secondary rotor are not the same, any combination adjustment of the self-rotating angles of the blades on the primary rotor and the secondary rotor can be achieved.
The following is illustrated by a specific example: the reduction hemispherical gear 11 has the number of teeth ofZ 3 =30, adjusting the number of teeth of the hemispherical gear 12Z 4 =20, relative position coefficient of the twod=1.667, the gear ratio of the reduction hemispherical gear 11 and the adjustment hemispherical gear 12 is determined as
Figure 94474DEST_PATH_IMAGE004
(ii) a The number of teeth of the outer ring gear of the flexible gear 7 isZ 1 =478 and the number of teeth of the ring gear 10 isZ 2 =480, the transmission ratio of the outer ring gear and the inner ring gear 10 of the flexspline 7 is
Figure 874212DEST_PATH_IMAGE006
The speed of the brake motor 2 isn=100r/min, if the rotation angle of the blade 14 of the first-stage rotor is 3 ° each time, the calculated rotation time t of the brake motor 2 is 3 s.

Claims (5)

1. The utility model provides a turbine machinery rotor system blade group slope and accurate adjusting device of spin angle which characterized in that: comprises a brake motor, a rotor driving mechanism and a blade shaft; the rotor is of a cylindrical structure, and at least one end of the rotor is provided with a brake motor; the output shaft of the brake motor is connected with the speed reducing shaft, the speed reducing shaft is provided with a rigid cam, and the rigid cam is in interference fit with the speed reducing shaft and is axially positioned through a shaft shoulder; the flexible gear is connected with the rotor through a bolt, an outer gear ring is arranged at the end, facing the rigid cam, of the flexible gear, the outer gear ring is positioned on the outer side of the rigid cam, and a flexible bearing is arranged between the outer gear ring and the rigid cam; the blade shaft is supported in the rotor through a bearing, a speed-reducing hemispherical gear is fixedly mounted on the blade shaft, an inner gear ring is arranged at the end part of the speed-reducing hemispherical gear, and the inner gear ring is meshed with an outer gear ring on the flexible gear; the rotor is provided with a plurality of blades through an inclination angle adjusting device, and the blades are positioned in the same section and are uniformly arranged along the circumferential direction; the inner ends of the blades are provided with adjusting hemispherical gears, and the adjusting hemispherical gears of the blades are respectively meshed with the speed reducing hemispherical gears.
2. The turbomachinery rotor system blade set pitch and spin angle fine tuning device of claim 1, wherein: the rotor comprises a primary rotor and a secondary rotor, the primary rotor and the secondary rotor are coaxial, and one opposite ends of the primary rotor and the secondary rotor are connected through bolts; two ends of the rotor are respectively provided with a motor connecting seat, and a brake motor is respectively arranged in the two motor connecting seats; each brake motor is connected with a speed reducing shaft; a group of blades are respectively arranged on the first-stage rotor and the second-stage rotor; a blade shaft is respectively arranged in the first-stage rotor and the second-stage rotor, and a speed-reducing hemispherical gear meshed with the adjusting hemispherical gear of the corresponding blade group on the rotor is respectively arranged on the two blade shafts; the speed reducing semi-spherical gears on the two blade shafts are respectively and fixedly provided with an inner gear ring, and the inner gear rings on the two speed reducing semi-spherical gears are respectively meshed with the outer gear rings of the flexible gears on the corresponding speed reducing shafts.
3. The turbomachinery rotor system blade set inclination and spin angle fine adjustment device of claim 1 or 2, wherein: the rotor driving mechanism comprises a driving motor, a driving belt wheel, a driven belt wheel, a synchronous belt and an expansion sleeve; the driving belt wheel is arranged on an output shaft of the driving motor, the driven belt wheel is arranged on the rotor through the expansion sleeve, and the driving belt wheel is connected with the driven belt wheel through the synchronous belt.
4. The turbomachinery rotor system blade set inclination and spin angle fine adjustment device of claim 1 or 2, wherein: the brake motor is electrically connected with the electrified slip ring; the flexible bearing adopts a thin-wall deep groove ball bearing.
5. The turbomachinery rotor system blade set inclination and spin angle fine adjustment device of claim 1 or 2, wherein: the inclination angle adjusting device comprises an adjusting tapered roller bearing, an opening clamping ring, a ball head, a clamping groove and an end cover; the rotor is provided with a circular through hole at the blade mounting position, and the end cover covers the outer end of the circular through hole; the adjusting tapered roller bearing is arranged in the circular through hole, the inner wall of the inner ring is a spherical surface, and the spherical surface is matched with the ball head to form a spherical hinge structure; the ball head is arranged on the blade, a plurality of annular clamping grooves are formed in the ball head, included angles formed by planes where the annular clamping grooves are located and planes where the adjusting tapered roller bearing is located are different, an opening clamping ring is arranged on the outer end face of the inner ring of the adjusting tapered roller bearing, and the opening clamping ring is matched with the clamping grooves in the ball head to fix the angle of the blade.
CN201911374637.6A 2019-12-27 2019-12-27 Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle Pending CN110966048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911374637.6A CN110966048A (en) 2019-12-27 2019-12-27 Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911374637.6A CN110966048A (en) 2019-12-27 2019-12-27 Accurate adjusting device of turbine machinery rotor system blade group slope and spin angle

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