Dynamic balancing drive for a rotor

Abstract

The application discloses a dynamic balance driving device of a rotor, which comprises a driving shaft and an elastic sleeve. The driving shaft comprises a driving shaft body and a positioning part. The elastic sleeve is sleeved on the positioning part and is used for making the positioning part and the shaft hole have the same shaft center when the positioning part extends into the shaft hole. The outer end surface of the driving shaft body has a limiting part outside the positioning part. The limiting part is used for limiting the driving connection end of the rotor shaft so that the rotor shaft and the driving shaft do not produce relative rotation. The dynamic balance driving device of the application is filled in the shaft hole of the rotor shaft through the elastic sleeve expansion mode, realizes the radial positioning of the rotor shaft and the driving shaft, makes the driving shaft and the rotor shaft keep coaxial, does not need to adopt the hot mounting mode for assembly, and does not need the special puller for disassembly, so that the assembly and disassembly period of the rotor shaft and the dynamic balance driving device is greatly shortened.

Description

Technical Field

[0001] This invention relates to a dynamic balancing drive device for a rotor. Background Technology

[0002] The low-pressure turbine with stator of an aero-engine requires dynamic balancing. In existing technologies, such as... Figure 1-2 As shown, during the dynamic balancing process, the positioning sleeve and flange in front of the shaft are connected to the drive shaft of the dynamic balancing drive device, which drives the rotor to rotate. The positioning sleeve is fixed to the end of the low-pressure turbine shaft by an interference fit. The inside of the positioning sleeve is provided with an internal spline that matches the spline of the low-pressure turbine shaft head to transmit the torque of the balancing machine drive shaft. The indexing method is used to eliminate the balancing error caused by the balancing fixture. The low-pressure turbine rotor is lifted from the front end by a V-shaped support plate, so that the positioning sleeve is separated from the roller (during dynamic balancing, the rotor will rotate with the balancing machine, and the positioning sleeve is supported by the roller to form the front end support). The tool has the following shortcomings: 1) The positioning sleeve uses an interference fit with the low-pressure turbine shaft, requiring a heat-fitting method. This means the positioning sleeve needs to be heated to 150-200 degrees Celsius before installation. Disassembly requires a special puller to remove the positioning sleeve from the low-pressure turbine shaft, making the operation cumbersome. Furthermore, balancing requires waiting for the positioning sleeve to cool naturally, resulting in a long assembly cycle. The heating, installation, disassembly, and waiting period for the positioning sleeve takes 4-6 hours; 2) The positioning sleeve acts as a front-end support during balancing, requiring high machining precision. The radial runout of its mating surfaces needs to be controlled within the micrometer level, and an internal... Torque is transmitted by the spline engaging with the external spline on the low-pressure turbine shaft, and the machining cost of the positioning sleeve is extremely high; 3) During the balancing process, the positioning sleeve contacts the roller, and the positioning sleeve can be regarded as the front end support of the low-pressure turbine shaft. When disassembling, a V-shaped support plate is required to lift the low-pressure turbine shaft from the front end so that the positioning sleeve can be separated from the roller. The axial length of the low-pressure turbine shaft is about 2 meters. In addition, the radial clearance between the low-pressure turbine rotor and the stator is small. If the lifting process is not operated properly, the front end lifting height will be greater than the specified value. After magnification, it is easy to cause radial scraping between the low-pressure turbine rotor and the stator, resulting in damage to parts and safety hazards. Summary of the Invention

[0003] The technical problem to be solved by the present invention is the defects of the existing dynamic balancing drive device, which uses a positioning bushing to connect with the rotor shaft for dynamic balancing, resulting in long assembly and disassembly cycles and high costs. The present invention provides a dynamic balancing drive device for rotors.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] This invention provides a dynamic balancing drive device for connecting and driving a rotor shaft. The drive connection end of the rotor shaft has a shaft hole coaxially disposed with the rotor shaft. The dynamic balancing drive device includes a drive shaft and an elastic sleeve. The drive shaft includes a drive shaft body and a positioning part located on the outer end face of the drive shaft body and coaxially disposed with the drive shaft body. The elastic sleeve is sleeved on the positioning part. The elastic sleeve is used to make the positioning part and the shaft hole have the same axis when the positioning part extends into the shaft hole.

[0006] The outer end face of the drive shaft body is located outside the positioning part and also has a limiting part. The limiting part is used to restrict the drive connection end of the rotor shaft so that the rotor shaft and the drive shaft do not rotate relative to each other.

[0007] In this solution, the dynamic balancing drive device is fitted into the rotor shaft bore using an elastic sleeve tensioning method, achieving radial positioning of the rotor shaft and drive shaft. This ensures that the drive shaft and rotor shaft remain coaxial, eliminating the need for heat-fitting assembly. Furthermore, disassembly of the drive device and rotor shaft can be achieved without a special puller, reducing the assembly and disassembly cycle of the dynamic balancing drive device to within half an hour, significantly shortening the overall assembly and disassembly cycle. Moreover, this dynamic balancing drive device does not require the use of internal splines to engage with external splines on the rotor shaft for torque transmission, thus reducing precision requirements and manufacturing costs.

[0008] Preferably, the dynamic balancing drive device further includes an extrusion member, which is a hollow conical shaft structure. The extrusion member is sleeved on the positioning part and can slide along the axial direction of the drive shaft.

[0009] The elastic sleeve is fitted onto the extruder, with the inner surface of the elastic sleeve fitting against the outer circumferential surface of the extruder, and the outer surface of the elastic sleeve adapting to the inner circumferential surface of the shaft hole.

[0010] In this solution, the elastic sleeve is compressed by the extruder to fill the space between the shaft hole of the rotor shaft and the drive shaft, thereby achieving radial positioning of the drive shaft and the rotor shaft and maintaining coaxiality.

[0011] Preferably, the dynamic balancing drive device further includes a drive assembly for driving the extruder to slide axially along the drive shaft on the positioning portion.

[0012] In this solution, the elastic sleeve is tightened by driving the extruder to move through the drive component.

[0013] Preferably, the positioning part has an inner cavity, and the positioning part is provided with a slotted through hole extending axially along the drive shaft and communicating with the inner cavity. The drive assembly includes a drive member, a slider and a connecting rod. The drive member is used to drive the slider to move axially along the drive shaft in the inner cavity. The connecting rod is connected to the slider and extends out of the slotted through hole to connect with the extruder.

[0014] In this solution, the above structure is adopted, which facilitates the axial movement of the drive extruder on the positioning part along the drive shaft to achieve the tensioning and recovery of the elastic sleeve, and realizes the assembly and disassembly of the drive shaft and the rotor shaft.

[0015] Preferably, there are two slotted through holes, symmetrically arranged on the positioning part, and the two ends of the connecting rod extend out of the two slotted through holes respectively to connect with the extrusion member.

[0016] In this design, the extruder is driven to move by the two ends of the connecting rod, thus avoiding the extruder being affected by force on one side.

[0017] Preferably, the driving component is a screw, which extends from one end of the drive shaft body away from the positioning part into the inner cavity and connects to the sliding component. The screw is threadedly connected to the drive shaft body.

[0018] In this design, a screw is used as the driving component. The rotation of the screw drives the axial movement of the sliding component, resulting in a simple structure and convenient operation.

[0019] Preferably, the screw is fixedly connected to the sliding member by a retaining ring.

[0020] In this solution, the above structure is adopted, which is simple to assemble and easy to disassemble.

[0021] Preferably, the drive connection end of the rotor shaft also has a locking slot, and the limiting part is a drive tooth adapted to the locking slot.

[0022] In this solution, the torque of the dynamic balancing drive device is transmitted by the engagement of the drive teeth with the locking slot at the shaft head of the rotor shaft, thereby driving the rotor to rotate. This avoids the traditional method of using the internal spline of the positioning sleeve to engage with the external spline on the rotor shaft to transmit torque, and avoids the machining of internal splines and high-precision positioning bushings, thus saving a lot of process costs.

[0023] Preferably, there are multiple locking slots, and the multiple locking slots are evenly spaced along the circumference of the rotor shaft.

[0024] In this scheme, by setting multiple locking slots, the rotor bearing is ensured to be subjected to a relatively balanced force by the dynamic balancing drive device.

[0025] Preferably, the elastic sleeve has a plurality of axially extending strip-shaped through holes in its circumference, and two adjacent strip-shaped through holes extend to different end faces of the elastic sleeve.

[0026] In this solution, the elastic sleeve adopts the above structure, which makes the elastic sleeve have a certain elasticity and can be deformed by compression, so as to eliminate the radial gap between the positioning part of the drive shaft and the rotor shaft.

[0027] Preferably, the dynamic balancing drive device further includes a positioning element, which is located at the end of the positioning part away from the drive shaft body, and the positioning element and the drive shaft body respectively restrict the axial movement of the elastic sleeve.

[0028] In this solution, the positioning element is used to initially position the positioning part of the drive shaft, and can ensure that the elastic sleeve can only undergo radial deformation under the restriction of the positioning element and the drive shaft body, without axial movement. This enables the radial positioning of the rotor shaft and the positioning part of the drive shaft, so that the drive shaft and the rotor shaft remain coaxial.

[0029] Preferably, the positioning element and the positioning part are detachable.

[0030] In this solution, the above structure is adopted, which facilitates the installation of the elastic sleeve and ensures good assembly repeatability.

[0031] Preferably, the outer peripheral surface of the drive connection end of the rotor shaft has an external thread, and the dynamic balancing drive device further includes a positioning ring. The positioning part has a first connecting part and a second connecting part along the axial direction. The positioning ring is adapted to the outer peripheral surface of the drive shaft on the inner peripheral surface of the first connecting part. The positioning ring has an internal thread on the inner peripheral surface of the second connecting part. The internal thread is used for threaded connection with the external thread of the rotor shaft.

[0032] The outer circumferential surface of the drive shaft body is provided with a first limiting hole, and the first connecting part has a second limiting hole corresponding to the first limiting hole. The positioning ring and the drive shaft body are angularly limited and fixed through the first limiting hole and the second limiting hole.

[0033] In this scheme, the drive shaft of the drive unit is threadedly connected to the rotor shaft through a positioning ring, which is used to achieve self-locking fixation of the drive shaft on the rotor shaft and increase the stability of the drive connection between the drive shaft and the rotor shaft.

[0034] Preferably, there are at least two first limiting holes; and / or

[0035] The first limiting hole is a threaded hole; and / or

[0036] The second limiting hole is a threaded hole.

[0037] In this solution, the above structure is used to facilitate fixing the positioning ring to the drive shaft.

[0038] Preferably, the end face of the drive shaft body away from the positioning part is provided with a drive shaft mounting hole, which is used to connect the drive shaft to the drive part of the dynamic balancing drive device.

[0039] The significant advantages of this invention are as follows: The dynamic balancing drive device of this invention fills the shaft hole of the rotor shaft with an elastic sleeve through a tightening method, achieving radial positioning of the rotor shaft and the drive shaft. This ensures that the drive shaft and rotor shaft remain coaxial, eliminating the need for heat-fitting assembly. Furthermore, disassembly of the drive device and rotor shaft can be achieved without the need for a special puller. The assembly and disassembly cycle of the dynamic balancing drive device can be shortened to within half an hour, significantly reducing the assembly and disassembly cycle of the rotor shaft and the dynamic balancing drive device. Moreover, this dynamic balancing drive device does not require the use of an internal spline to engage with an external spline on the rotor shaft for torque transmission, thus reducing precision requirements and manufacturing costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a partial structure of a turbine shaft in the prior art.

[0041] Figure 2 This is a schematic diagram of a low-pressure turbine with a stator balancing drive device in the prior art.

[0042] Figure 3 This is an exploded view of the rotor dynamic balancing drive device in an embodiment of the present invention.

[0043] Figure 4 This is a cross-sectional view of the rotor dynamic balancing drive device in an embodiment of the present invention.

[0044] Figure 5 This is a cross-sectional view of the rotor dynamic balancing drive device in another direction according to an embodiment of the present invention.

[0045] Figure 6 This is a schematic diagram of the assembly of the rotor dynamic balancing drive device and the turbine shaft in an embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] Turbine Shaft 10

[0048] Shaft hole 11

[0049] Lock slot 12

[0050] Thread section 13

[0051] external spline 14

[0052] Positioning surface 15

[0053] Positioning sleeve 20

[0054] Interference fit section 21

[0055] Flange 30

[0056] Threaded connection section 31

[0057] Bolt 40

[0058] 50 rollers

[0059] V-shaped support plate 60

[0060] Drive shaft 100

[0061] Drive shaft body 110

[0062] Drive gear 111

[0063] First limiting hole 112

[0064] Drive shaft mounting hole 113

[0065] Positioning Unit 120

[0066] 121 slotted through hole

[0067] Inner cavity 122

[0068] Elastic sleeve 200

[0069] 201 strip-shaped through hole

[0070] Extrusion part 300

[0071] Slider 400

[0072] Connecting rod mounting hole 401

[0073] Connecting rod 500

[0074] Drive component 600

[0075] Positioning component 700

[0076] Threaded connector 710

[0077] Positioning ring 800

[0078] First connecting part 810

[0079] Second connecting part 820

[0080] Second limiting hole 801

[0081] Limiting component 900 Detailed Implementation

[0082] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments thereon.

[0083] like Figure 3-6 As shown, this embodiment of the invention provides a dynamic balancing drive device for a rotor, used to connect to and drive a rotor shaft. The technical solution of this invention will be described in detail below using the dynamic balancing of a low-pressure turbine as an example.

[0084] like Figure 1 As shown, the drive connection end of the rotor shaft of the low-pressure turbine (hereinafter referred to as "turbine shaft 10") has a shaft hole 11 coaxially disposed with the turbine shaft 10. Figure 3 As shown, the dynamic balancing drive device includes a drive shaft 100 and an elastic sleeve 200. The drive shaft 100 includes a drive shaft body 110 and a positioning part 120 located on the outer end face of the drive shaft body 110 and coaxially disposed with the drive shaft body 110. The elastic sleeve 200 is sleeved on the positioning part 120. The elastic sleeve 200 is used to make the positioning part 120 and the shaft hole 11 have the same axis when the positioning part 120 extends into the shaft hole 11. The outer end face of the drive shaft body 110 located outside the positioning part 120 also has a limiting part, which is used to limit the drive connection end of the turbine shaft 10 so that the turbine shaft 10 and the drive shaft 100 do not rotate relative to each other. In this embodiment, both the drive shaft body 110 and the positioning part 120 are cylindrical structures, and the drive shaft body 110 and the positioning part 120 are integrally formed.

[0085] The dynamic balancing drive device is fitted into the shaft hole 11 of the turbine shaft 10 by means of an elastic sleeve 200, achieving radial positioning of the turbine shaft 10 and the drive shaft 100. This ensures that the drive shaft 100 and the turbine shaft 10 remain coaxial, eliminating the need for heat-fitting assembly. Furthermore, disassembly of the drive device and turbine shaft 10 can be achieved without the need for a special puller. The assembly and disassembly cycle of the dynamic balancing drive device can be shortened to less than half an hour, significantly reducing the assembly and disassembly cycle of the turbine shaft 10 and the dynamic balancing drive device. Moreover, this dynamic balancing drive device does not require the use of an internal spline to engage with the external spline on the turbine shaft 10 for torque transmission, thus requiring lower precision and resulting in lower processing costs.

[0086] like Figure 3-5As shown, in this embodiment, the dynamic balancing drive device further includes an extrusion member 300, which is a hollow conical shaft structure. The extrusion member 300 is sleeved on the positioning part 120 and can slide along the axial direction of the drive shaft 100. An elastic sleeve 200 is sleeved on the extrusion member 300, with its inner surface fitting against the outer peripheral surface of the extrusion member 300, and its outer surface adapting to the inner peripheral surface of the shaft hole 11. By extruding the elastic sleeve 200 through the extrusion member 300, the elastic sleeve 200 fills the space between the shaft hole 11 of the turbine shaft 10 and the drive shaft 100, achieving radial positioning of the drive shaft 100 and the turbine shaft 10 and maintaining coaxiality. The extrusion member 300 uses a conical surface that mates with the conical hole of the elastic sleeve 200, and the elastic sleeve 200 is deformed under the extrusion of the conical surface.

[0087] The dynamic balancing drive device also includes a drive assembly for driving the extruder 300 to slide axially along the drive shaft 100 on the positioning part 120. The movement of the extruder 300 driven by the drive assembly causes the elastic sleeve 200 to tighten.

[0088] like Figure 3-5 As shown, the positioning part 120 has an inner cavity 122. The positioning part 120 has a slotted through hole 121 extending axially along the drive shaft 100 and communicating with the inner cavity 122. The drive assembly includes a drive member 600, a sliding member 400, and a connecting rod 500. The drive member 600 drives the sliding member 400 to move axially along the drive shaft 100 within the inner cavity 122. The connecting rod 500 is connected to the sliding member 400 and extends out of the slotted through hole 121 to connect with the extruder 300. This structure facilitates the driving of the extruder 300 to move axially along the drive shaft 100 on the positioning part 120, thereby deforming and restoring the elastic sleeve 200, and thus enabling the assembly and disassembly of the drive shaft 100 and the turbine shaft 10. The sliding member 400 has a connecting rod mounting hole 401, through which the connecting rod 500 is mounted on the sliding member 400.

[0089] There are two slotted through holes 121, symmetrically arranged on the positioning part 120. The two ends of the connecting rod 500 extend out of the two slotted through holes 121 respectively and connect to the extruder 300. The extruder 300 is driven to move by the two ends of the connecting rod 500, so as to avoid the extruder 300 being affected by force on one side.

[0090] In this embodiment, the driving component 600 is a screw. The screw extends from the end of the drive shaft body 110 away from the positioning part 120 into the inner cavity 122 and connects to the sliding component 400. The screw is threadedly connected to the drive shaft body 110. The driving component 600 uses a screw, and the rotation of the screw drives the axial movement of the sliding component 400. The structure is simple and the operation is convenient.

[0091] The positioning part 120 of the drive shaft 100 is provided with a slotted through hole 121. The connecting rod 500 passes through the slotted through hole 121 and connects with the outer extrusion member 300 to achieve communication from the inside to the outside. The sliding member 400 and the connecting rod 500 in the positioning part 120 can be driven to move axially by the screw installed in the drive shaft body 110, thereby pushing the extrusion member 300 to move axially to extrude the elastic sleeve 200. The elastic sleeve 200 is deformed by the gradually increasing conical surface of the extrusion member 300, so that the elastic sleeve 200 is tightened in the shaft hole 11 of the turbine shaft 10, eliminating the radial clearance between the drive shaft 100 and the turbine shaft 10, ensuring that the axis of the drive shaft 100 and the turbine shaft 10 of the drive balancing device are aligned, the assembly repeatability is good, and the balance error caused by the tooling is small.

[0092] In this embodiment, the screw is fixedly connected to the slider 400 via a retaining ring, which simplifies assembly and facilitates disassembly. The screw can also be fixedly connected to the slider 400 via other connection methods, which will not be elaborated upon here.

[0093] like Figure 1 and Figure 3 As shown, in this embodiment, since the drive connection end of the turbine shaft 10 has a locking groove 12, the limiting part on the drive shaft body 110 is a drive tooth 111 that matches the locking groove 12. The torque of the dynamic balancing drive device is transmitted by the engagement of the drive tooth 111 with the locking groove 12 at the shaft head of the turbine shaft 10, thereby driving the turbine shaft 10 to rotate. This avoids the traditional method of using the internal spline of the positioning sleeve to engage with the external spline on the turbine shaft 10 to transmit torque, thus avoiding the machining of internal splines and high-precision positioning bushings, saving a lot of process costs.

[0094] There are multiple locking slots 12 on the turbine shaft 10, and the multiple locking slots 12 are evenly spaced along the circumference of the turbine shaft 10. By setting multiple locking slots 12, it is ensured that the turbine shaft 10 bears a relatively balanced force from the dynamic balancing drive device.

[0095] In other embodiments, the limiting part may also be a groove recessed along the axial direction on the outer end face of the self-drive shaft body 110, and the locking plate structure between two adjacent locking plate grooves 12 can extend into the groove to realize the angular limiting of the turbine shaft 10 and the drive shaft 100.

[0096] like Figure 3 As shown, the elastic sleeve 200 has multiple axially extending strip-shaped through holes 201 in its circumferential direction, with adjacent two strip-shaped through holes 201 extending to different end faces of the elastic sleeve 200. This structure gives the elastic sleeve 200 a certain elasticity, allowing it to deform under pressure, thus facilitating the elimination of radial clearance between the positioning portion 120 of the drive shaft 100 and the turbine shaft 10. It also facilitates the fitting of the elastic sleeve 200 onto the positioning portion 120.

[0097] like Figure 3-6 As shown, the dynamic balancing drive device also includes a positioning member 700, which is located at the end of the positioning portion 120 away from the drive shaft body 110. The positioning member 700 and the drive shaft body 110 respectively restrict the axial movement of the elastic sleeve 200. The positioning member 700 is used to initially position the positioning portion 120 of the drive shaft 100, and can ensure that the elastic sleeve 200 can only undergo radial deformation under the restriction of the positioning member 700 and the drive shaft body 110, without axial movement. This enables the turbine shaft 10 to be radially positioned with the positioning portion 120 of the drive shaft 100, so that the drive shaft 100 and the turbine shaft 10 remain coaxial.

[0098] The elastic sleeve 200 is clamped between the drive shaft 100 and the positioning member 700. The positioning member 700 and the shaft hole 11 of the turbine shaft 10 are fitted with a small clearance to achieve initial coaxial positioning of the turbine shaft 10 and the drive shaft 100. After the elastic sleeve 200 is opened, the radial clearance between the drive shaft 100 and the low-pressure shaft is eliminated to achieve precise coaxial positioning. The elastic sleeve 200 is blocked by the positioning member 700 and the double flange of the drive shaft 100, so it can only undergo radial deformation and will not move with the extrusion member 300. The assembly repeatability is good and the balance error caused by the balancing tooling is reduced.

[0099] The positioning element 700 and the positioning part 120 are detachable. The detachable installation structure facilitates the installation of the elastic sleeve 200 and ensures good assembly repeatability. In this embodiment, the positioning element 700 is a hollow cylindrical structure, and the positioning element 700 and the positioning part 120 are connected by a threaded connector 710 (bolt or screw). After installation, the threaded connector 710 is located inside the positioning element 700.

[0100] like Figure 1 As shown, the outer circumferential surface of the drive connection end of the turbine shaft 10 has an external thread. In this embodiment, the dynamic balancing drive device further includes a positioning ring 800. The positioning part 120 has a first connecting part 810 and a second connecting part 820 along the axial direction. The positioning ring 800 is adapted to the outer circumferential surface of the drive shaft 100 on the inner circumferential surface of the first connecting part 810. The positioning ring 800 has an internal thread on the inner circumferential surface of the second connecting part 820. The internal thread is used for threaded connection with the external thread of the turbine shaft 10. A first limiting hole 112 is provided on the outer circumferential surface of the drive shaft body 110. The first connecting part 810 has a second limiting hole 801 corresponding to the first limiting hole 112. The positioning ring 800 and the drive shaft body 110 are angularly limited and fixed through the first limiting hole 112 and the second limiting hole 801. The drive shaft 100 of the drive unit is threadedly connected to the turbine shaft 10 via a positioning ring 800, which is used to achieve self-locking fixation of the drive shaft 100 on the turbine shaft 10 and increase the stability of the drive connection between the drive shaft 100 and the turbine shaft 10.

[0101] In this embodiment, there are at least two first limiting holes 112, both of which are threaded holes. The positioning ring 800 is connected to the turbine shaft 10 via threads. The limiting member 900 is threadedly installed in the second limiting hole 801 of the positioning ring 800 and inserted into the first limiting hole 112 on the drive shaft 100. The drive shaft 100 and the positioning ring 800 form an interlocking structure through the limiting member 900, realizing the axial and angular limiting of the drive device on the turbine shaft 10, and achieving a stable connection of the drive device on the turbine shaft 10. In this embodiment, the limiting member 900 is a screw.

[0102] In other embodiments, only one of the first limiting hole 112 or the second limiting hole 801 may be a threaded hole, as long as the positioning ring 800 can be fixed on the drive shaft 100.

[0103] The positioning ring 800 is also equipped with an annular limiting groove, which can lock the relative position of the rotor and the stator. During balancing, the relative position of the rotor and the stator can be confirmed through the annular limiting groove to prevent the rotor and the stator from scraping each other axially.

[0104] The end face of the drive shaft body 110 away from the positioning part 120 is provided with a drive shaft mounting hole 113, which is used to connect the drive shaft 100 to the drive part of the dynamic balancing drive device.

[0105] like Figure 3-6 As shown below, the assembly and disassembly of the dynamic balancing drive device are described.

[0106] During assembly, the assembled dynamic balancing drive device is installed into the shaft hole 11 of the turbine shaft 10, the screw is tightened, the drive sliding member 400 moves to the right, the connecting rod 500 pushes the extrusion member 300 to the right, the conical surface of the extrusion member 300 extrudes the conical hole of the elastic sleeve 200, causing the elastic sleeve 200 to expand, eliminating the radial clearance between the positioning part 120 of the drive shaft 100 and the shaft hole 11 of the turbine shaft 10, and realizing the precise coaxiality of the drive shaft 100 and the turbine shaft 10; then the positioning ring 800 is screwed onto the turbine shaft 10, aligning the first limiting hole 112 and the second limiting hole 801 on the drive shaft 100 and the positioning ring 800, and the threaded limiting member 900 is screwed into the first limiting hole 112 and the second limiting hole 801, realizing the interlocking between the positioning ring 800 and the drive shaft 100, ensuring the axial and angular limiting of the drive device on the turbine shaft 10.

[0107] During disassembly, after removing the limiting part 900, unscrew the positioning ring 8005, loosen the screw 8, drive the sliding part 400 to move to the left, the connecting rod 500 pushes the extrusion part 300 to move to the left, the elastic sleeve 2003 deforms and disappears, and the dynamic balance drive device can be completely extracted from the turbine shaft 10.

[0108] The dynamic balancing drive device of the present invention can change the support of the low-pressure turbine from the interference-connected limiting sleeve to the positioning surface 15 of the turbine shaft 10 itself, thereby eliminating the need for the high-precision interference-connected limiting sleeve, significantly reducing manufacturing costs. Under the new process, the manufacturing cost of the dynamic balancing drive device is 1 / 100 of that of the original limiting sleeve.

[0109] The radial positioning of the dynamic balancing drive unit and the low-pressure turbine has been changed from the original interference fit to the extrusion of the 300 extrusion elastic sleeve 200 deformation. This not only avoids the hot fitting process, but also avoids the disassembly of the interference fit parts by special extraction tools. It also eliminates the need for natural cooling. Under the new process, the assembly cycle of the dynamic balancing drive unit has been reduced from the original 4-6 hours to within 30 minutes.

[0110] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A dynamic balancing drive device for a rotor, used to connect to and drive the rotor shaft of a low-pressure turbine, wherein the drive connection end of the rotor shaft has a shaft hole coaxially disposed with the rotor shaft, characterized in that, The dynamic balancing drive device includes a drive shaft and an elastic sleeve. The drive shaft includes a drive shaft body and a positioning part located on the outer end face of the drive shaft body and coaxially disposed with the drive shaft body. The elastic sleeve is sleeved on the positioning part. The elastic sleeve is used to make the positioning part and the shaft hole have the same axis when the positioning part extends into the shaft hole. The dynamic balancing drive device also includes an extrusion component, which is a hollow conical shaft structure. The extrusion component is sleeved on the positioning part and can slide along the axial direction of the drive shaft. The elastic sleeve is fitted onto the extrusion member, the inner surface of the elastic sleeve is in contact with the outer peripheral surface of the extrusion member, and the outer surface of the elastic sleeve is adapted to the inner peripheral surface of the shaft hole. The elastic sleeve has a plurality of axially extending strip-shaped through holes in its circumference, and two adjacent strip-shaped through holes extend to different end faces of the elastic sleeve. The outer end face of the drive shaft body is located outside the positioning part and also has a limiting part. The limiting part is used to restrict the drive connection end of the rotor shaft so that the rotor shaft and the drive shaft do not rotate relative to each other.

2. The rotor dynamic balancing drive device as described in claim 1, characterized in that, The dynamic balancing drive device further includes a drive assembly for driving the extruder to slide axially along the drive shaft on the positioning part.

3. The rotor dynamic balancing drive device as described in claim 2, characterized in that, The positioning part has an inner cavity, and the positioning part is provided with a slotted through hole extending axially along the drive shaft and communicating with the inner cavity. The drive assembly includes a drive member, a sliding member and a connecting rod. The drive member is used to drive the sliding member to move axially along the drive shaft within the inner cavity. The connecting rod is connected to the sliding member and extends out of the slotted through hole to connect with the extruder.

4. The rotor dynamic balancing drive device as described in claim 3, characterized in that, There are two slotted through holes, symmetrically arranged on the positioning part, and the two ends of the connecting rod extend out of the two slotted through holes respectively to connect with the extrusion part.

5. The rotor dynamic balancing drive device as described in claim 3, characterized in that, The driving component is a screw, which extends from one end of the drive shaft body away from the positioning part into the inner cavity and connects to the sliding component. The screw is threadedly connected to the drive shaft body.

6. The rotor dynamic balancing drive device as described in claim 5, characterized in that, The screw is fixedly connected to the sliding member by a retaining ring.

7. The rotor dynamic balancing drive device as described in claim 1, characterized in that, The drive connection end of the rotor shaft also has a locking slot, and the limiting part is a drive tooth that is adapted to the locking slot.

8. The rotor dynamic balancing drive device as described in claim 7, characterized in that, There are multiple locking slots, and the multiple locking slots are evenly spaced along the circumference of the rotor shaft.

9. The rotor dynamic balancing drive device as described in claim 1, characterized in that, The dynamic balancing drive device further includes a positioning element, which is located at the end of the positioning part away from the drive shaft body. The positioning element and the drive shaft body respectively restrict the axial movement of the elastic sleeve.

10. The rotor dynamic balancing drive device as described in claim 9, characterized in that, The positioning element and the positioning part are detachable and installable.

Images