Rotor and stator assembly balance verification device and balance verification method
By coaxially arranging the support frame and bearing assembly, and combining the expansion drive assembly with the rotor interference fit, the problems of long manufacturing cycle of rotor-stator assembly and difficult installation of drive wheel are solved, achieving efficient and accurate dynamic balance verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-03-27
AI Technical Summary
The existing rotor-stator assembly manufacturing process requires the rotor to be disassembled and assembled twice, which extends the manufacturing cycle. The drive wheel is difficult to install, the coaxiality of the front and rear support points is difficult to check, and the resulting imbalance cannot be compensated.
The coaxial arrangement of the rotor and stator assemblies is achieved by using a support frame and bearing assembly. The radial and axial clearance adjustment is simplified by using an expansion drive assembly with an interference fit with the rotor, ensuring the coaxial positioning of the drive assembly and avoiding the introduction of imbalance.
Shorten the manufacturing cycle, simplify the assembly process, improve efficiency, ensure the accuracy of dynamic balancing, reduce labor intensity, and avoid the impact of drive wheel imbalance.
Smart Images
Figure CN121740332A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of assembling aero-engine parts, in particular, to a rotor-stator assembly balance checking device. In addition, the present application also relates to a rotor-stator assembly balance checking method using the above rotor-stator assembly balance checking device. BACKGROUND
[0002] The information provided in this section is for the purpose of generally presenting the context of the application. To the extent that the descriptions in this section describe the work of the inventors, and to the extent that the descriptions are not considered prior art by themselves or in combination with other prior art, they are not an admission that the field of the application was at the time the inventors made their contributions either in this particular, or any other, form.
[0003] Aero-engines often need to be assembled in stages by assembling stators and rotors. There are two existing balance processes for rotor-stator assemblies. Please refer to the attached drawings of the specification Figure 4 and 5 The first process does not assemble stators first, but only checks the initial unbalance of the rotors. If the initial unbalance is unqualified, the rotors are disassembled and reassembled for balance. If the initial unbalance meets the requirements, the rotors are disassembled, assembled with stators in stages, and then balanced. The second process only balances the rotors, and then disassembles and reassembles the rotor-stator assembly. The rotor-stator assembly is not checked for balance in the state of having stators.
[0004] Both of the existing rotor-stator assembly manufacturing processes need to disassemble and reassemble the rotors twice, which prolongs the manufacturing cycle. As shown in the attached drawings of the specification Figure 2 Process one is convenient to install, and the rotors are supported by bearings on the balancing machine and driven by a belt between the discs. After the rotors are installed on the balancing machine, due to the different shafts of the front and rear supports, there is a large gap between the bearing bush and the bearing, which is difficult to adjust, and the disc rotors are prone to insufficient rotation.
[0005] Please refer to the attached drawings of the specification Figure 3, the rotor-stator assembly utilizes a driving wheel to transmit torque to the rotor, and the driving wheel comprises a spline shaft, a core rod, a nut, a belt pulley and an extension rod, etc. When in use, the following problems may occur: the rotor state and the stator state of the assembly support mode are different, the driving position is different, which causes the difference of the initial unbalance of the assembly and the rotor; the front and rear support points of the rotor state are difficult to check; the axial and radial clearances of the rotor and the stator state are difficult to adjust, at least four feeler gauges are needed to measure the radial clearances of the rotor and the stator along the circumferential direction, and the axial distance between the front and rear ends of the rotor and the stator should meet the requirements, at least four points are measured, and if any radial or axial clearance is unqualified, the position of the casing support needs to be adjusted; the driving wheel needs to be assembled from the rear end with the spline shaft, then the core rod is placed in the spline shaft from the front end with the extension rod, and finally the core rod is tightened at the rear end with the nut, which is difficult to assemble and at least two people are needed to complete the assembly stably; in order to facilitate disassembly, the spline shaft and the rotor stop are gap-fitted, the value is greater than 0.2, which causes the unbalance of the driving wheel when balancing the rotor and the stator, and the unbalance cannot be compensated.
[0006] Therefore, in order to shorten the overall manufacturing cycle of the rotor-stator assembly, unify the driving position of the rotor and the rotor and the stator state, ensure the coaxiality of the front and rear support points, simplify the axial and radial clearance adjustment process, simplify the installation of the driving wheel, and reduce the unbalance of the driving wheel, the application provides a rotor-stator assembly balancing and checking device and a balancing and checking method. SUMMARY
[0007] In view of at least one of the above technical problems, the application provides a rotor-stator assembly balancing and checking device, which can ensure the radial and axial clearances of the rotor-stator assembly through the support frame, realize accurate positioning, and does not need to perform separate assembly, balancing and disassembly of the rotor, thereby shortening the manufacturing cycle and improving the efficiency.
[0008] Meanwhile, the application also provides a rotor-stator assembly balancing and checking method using the above rotor-stator assembly balancing and checking device.
[0009] According to an aspect of the application, a rotor-stator assembly balancing and checking device is provided for balancing and checking a rotor-stator assembly of an aero-engine, the rotor-stator assembly comprising a rotor and a stator, and the rotor-stator assembly balancing and checking device comprising a support frame, a bearing assembly and a driving assembly: The support frame is used to support the rotor-stator assembly, the bearing assembly is arranged on the support frame and connected with the support frame as a whole, and the bearing assembly is used to support the front and rear support points of the rotor-stator assembly to make the front and rear support points of the rotor-stator assembly coaxial; The driving assembly comprises a connecting shaft, a pin shaft, a driving shaft and a locking piece, the first end of the connecting shaft is provided as an expandable structure and is used to extend into the shaft journal of the rotor, the driving shaft is arranged at the second end of the connecting shaft, the driving shaft is used to be connected with the balancing machine and is used for the driving belt of the balancing machine to be overlapped, the end of the driving shaft away from the connecting shaft is provided with an empty slot, the first end of the pin shaft is provided as a tapered structure and is arranged in the hollow channel prearranged in the connecting shaft, the second end of the pin shaft enters the empty slot after passing through the prearranged through hole in the sidewall of the empty slot, the locking piece is sleeved on the second end of the pin shaft and is threadedly connected with the pin shaft, the locking piece is used to be rotated and driven to move along the axial direction to extrude the connecting shaft to make the connecting shaft expand, and then the interference fit between the connecting shaft and the shaft journal of the rotor is realized.
[0010] In some embodiments of the present application, the hollow channel of the connecting shaft is a tapered hole structure, and the diameter of the hollow channel gradually decreases from the first end to the second end of the connecting shaft, and the outer wall of the pin shaft is a tapered surface structure to cooperate with the hollow channel.
[0011] In some embodiments of the present application, the outer wall of the connecting shaft is provided with a deformation slot.
[0012] In some embodiments of the present application, the driving assembly further comprises a positioning piece, the second end of the connecting shaft is provided with a positioning slot, the positioning piece is arranged at the end of the driving shaft close to the connecting shaft, and the positioning piece is used to cooperate with the positioning slot to realize the circumferential limiting of the driving shaft and the connecting shaft.
[0013] In some embodiments of the present application, the first end and the second end of the support frame are provided with a first supporting step and a second supporting step one by one, the bearing assembly comprises a first bearing arranged on the first supporting step and a second bearing arranged on the second supporting step, and the first bearing and the second bearing are coaxially arranged.
[0014] In some embodiments of the present application, a limiting cavity is arranged in the support frame, the limiting cavity is used to limit the rotor-stator assembly, the bottom of the limiting cavity is provided with a stator front positioning table and a stator rear supporting step, the stator front positioning table is used to support and limit the stator, and the stator rear supporting step is used to support the rear end of the stator; the rotor-stator assembly balance checking device further comprises a stator limiting pin, the stator limiting pin is used to abut against and tightly press the front end of the stator after passing through the limiting hole prearranged in the sidewall of the limiting cavity, so that the stator is tightly pressed on the stator rear supporting step.
[0015] In some embodiments of the present application, the support frame comprises a connecting assembly and first and second supporting plates arranged at intervals, the stator rear supporting step is arranged on the first supporting plate, the connecting assembly is used to connect and limit the first supporting plate and the second supporting plate, and the connecting assembly is further used to drive the plurality of stator limiting pieces to move synchronously to abut against the sidewall of the stator at the same time.
[0016] In some embodiments of the present application, the connecting assembly comprises a connecting rod, a limiting plate, a first locking member and a second locking member. The connecting rod is used to pass through the connecting holes pre-set on the first support plate and the second support plate to connect the two plates. The first locking member is sleeved on the connecting rod and located on the inner side of the first support plate or the second support plate. The limiting plate is sleeved on the connecting rod and located on the outer side of the second support plate. The limiting plate is used to be connected with the plurality of stator limiting members. The compression spring is arranged between the limiting plate and the second support plate. The second locking member is sleeved on the connecting rod and located on the outer side of the first support plate and the second support plate. The first locking member and the second locking member are both threadedly connected with the connecting rod. The second locking member is used to be screwed to push the limiting plate to drive the plurality of stator limiting members to move and abut against the side wall of the stator. The second locking member is also used to limit the first support plate and the second support plate in cooperation with the limiting plate and the first locking member.
[0017] According to another aspect of the present application, a rotor-stator assembly balance checking method is also provided, which adopts the above-mentioned rotor-stator assembly balance checking device. The rotor-stator assembly balance checking method comprises the following steps: S100: mounting the rotor-stator assembly on the support frame and connecting with the bearing assembly; S200: connecting the rotor with the balancing machine through the driving assembly; S300: checking the initial unbalance of the rotor-stator assembly; S400: rotating the rotor relative to the driving assembly by a preset angle to compensate the unbalance; S500: starting the balancing machine to perform dynamic balancing.
[0018] In some embodiments of the present application, in step S400, the rotor is rotated by 180° relative to the driving assembly to compensate the unbalance.
[0019] The present application has the following beneficial effects: The rotor-stator assembly balance checking device supports the rotor-stator assembly through the support frame, sets the bearing assembly on the support frame, connects the front and rear fulcrums of the rotor-stator assembly with the bearing assembly, and connects the bearing assembly with the support frame into an integral structure instead of a split structure to reduce the deflection of the fulcrums. The bearing assembly is used to realize the coaxial arrangement of the front and rear fulcrums of the rotor-stator assembly, and the support frame and the bearing assembly are used to ensure the coaxial arrangement of the front and rear fulcrums of the rotor-stator assembly, effectively simplify the radial and axial gap adjustment process of the rotor-stator assembly, and ensure the positioning of the rotor-stator assembly. The driving assembly is used to connect the rotor with the balancing machine. The first end of the connecting shaft of the driving assembly can be inserted into the shaft neck of the rotor and be in interference fit with the shaft neck. The driving shaft provided at the second end of the connecting shaft can be connected with the balancing machine and be used to lap the driving belt of the balancing machine. The first end of the pin shaft is arranged in the hollow channel of the connecting shaft. The second end of the pin shaft is arranged in the air-avoiding groove through the through hole of the sidewall of the air-avoiding groove. The locking member is sleeved on the second end of the pin shaft and is in threaded connection with the pin shaft. Thus, the pin shaft can be moved by rotating the locking member to press the connecting shaft to expand the connecting shaft, and the interference fit between the connecting shaft and the shaft neck of the rotor is realized. The driving assembly is of the expansion type, and the structure is more compact. In the case of meeting the rigidity, the mass is smaller, the centering effect is better, the coaxial positioning of the connecting shaft and the rotor is ensured, the large driving unbalance is avoided, the installation is more convenient, and the assembly problem of the driving wheel is effectively solved. The driving wheel needs to be first assembled into the spline shaft from the rear end, then the core rod is placed in the spline shaft from the front end by using the lengthened rod, and finally the core rod is tightened by using the nut at the rear end. More than two persons are not needed for assembly, the radial and axial jumping of the rotor and the tool is avoided, the rotor is not needed to be placed in the rotor gravity center on the balancing machine, the rotor is not needed to be installed from the front end into the inner cavity, and the assembly labor intensity and amount are greatly reduced.
[0020] The rotor-stator assembly balance checking method also has the beneficial effects described above. The rotor does not need to be separately assembled, balanced and disassembled, the manufacturing cycle is shortened, and the efficiency is improved. The radial and axial gap adjustment process of the rotor-stator assembly is simplified, the positioning is more accurate, the driving position of the rotor state and the rotor-stator assembly state is unified by the bearing assembly, the coaxial arrangement of the front and rear fulcrums of the rotor-stator assembly is ensured, the problem of difficult inspection of the front and rear fulcrums of the rotor state is solved, and the unbalance caused by the driving assembly is effectively solved to ensure the accuracy of dynamic balance.
[0021] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are intended to explain the aspects of the present application and are not limiting of the present application. In the drawings: Figure 1 is an operation flow diagram of a dynamic balance checking method in the prior art; Figure 2 is a schematic diagram of a rotor state in a dynamic balance process of the dynamic balance checking method shown in Figure 1 Figure 3 is an operation flow diagram of another dynamic balance checking method in the prior art; Figure 4 is a schematic diagram of a rotor state in a dynamic balance process of the dynamic balance checking method shown in Figure 3 Figure 5 is a schematic diagram of the overall structure of a support frame of a preferred embodiment of the present application; Figure 6 is a schematic diagram of the internal structure of a support frame of a preferred embodiment of the present application; Figure 7 is a schematic diagram of a side view of a support frame of a preferred embodiment of the present application; Figure 8 is a schematic diagram of a support plate connected by a connecting assembly of a preferred embodiment of the present application; Figure 9 is a schematic diagram of the position of an avoidance groove of a preferred embodiment of the present application; Figure 10 is a schematic diagram of the structure of a driving assembly of a preferred embodiment of the present application; Figure 11 is a schematic diagram of the principle of balance compensation of a preferred embodiment of the present application; Figure 12 is a schematic diagram of the structure of a connecting assembly of a preferred embodiment of the present application.
[0023] Legend: 1, support frame; 11, front fulcrum step; 12, rear fulcrum step; 13, first bearing step; 14, second bearing step; 15, stator front positioning platform; 16, stator rear bearing step; 17, support platform; 18, avoidance groove; 19, connecting assembly; 191, connecting rod; 192, limiting plate; 193, first locking member; 194, second locking member; 195, compression spring; 2, first bearing; 3, second bearing; 4, bearing fixing member; 5, stator limiting member; 6, lifting ring; 7, driving assembly; 71, connecting shaft; 711, deformation groove; 72, pin shaft; 73, driving shaft; 731, avoidance groove; 74, locking member; 75, positioning member. DETAILED DESCRIPTION
[0024] The following description provides specific applications and requirements of the present specification, in order to enable a person skilled in the art to manufacture and use the contents of the present specification. Various local modifications of the disclosed embodiments are obvious to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present specification. Therefore, the present specification is not limited to the embodiments shown, but is consistent with the widest scope of the claims.
[0025] Figure 1 is the overall structure schematic diagram of the support frame of the preferred embodiment of the present application; Figure 2 is the schematic diagram of the rotor state of the dynamic balancing process of process one; Figure 3 is the schematic diagram of the rotor-stator assembly state of the dynamic balancing process of process two; Figure 4 is the schematic diagram of the operation process of process one; Figure 5 is the schematic diagram of the operation process of process two; Figure 6 is the internal structure schematic diagram of the support frame of the preferred embodiment of the present application; Figure 7 is the side view schematic diagram of the support frame of the preferred embodiment of the present application; Figure 8 is the position schematic diagram of the avoidance groove of the preferred embodiment of the present application; Figure 9 is the schematic diagram of the connection of the support plate of the preferred embodiment of the present application through the connecting assembly; Figure 10 is the principle schematic diagram of the balance compensation of the preferred embodiment of the present application.
[0026] A rotor-stator assembly balance checking device is used for balance checking of a rotor-stator assembly of an aero-engine, the rotor-stator assembly comprising a rotor and a stator, the rotor-stator assembly balance checking device comprising a support frame 1, a bearing assembly and a driving assembly 7: The support frame 1 is used for supporting the rotor-stator assembly, the bearing assembly is arranged on the support frame 1 and connected with the support frame 1 as a whole, and the bearing assembly is used for supporting front and rear fulcrums of the rotor-stator assembly so as to coaxially arrange the front and rear fulcrums of the rotor-stator assembly; The driving assembly 7 comprises a connecting shaft 71, a pin shaft 72, a driving shaft 73 and a locking piece 74, a first end of the connecting shaft 71 is provided as an expandable structure and is used for extending into a shaft neck of the rotor, the driving shaft 73 is arranged at a second end of the connecting shaft 71, the driving shaft 73 is used for being connected with a balancing machine and providing a driving belt of the balancing machine with lap joint, an avoidance groove 731 is arranged at an end of the driving shaft 73 away from the connecting shaft 71, a first end of the pin shaft 72 is provided as a tapered structure and is arranged in a pre-set hollow channel in the connecting shaft 71, a second end of the pin shaft 72 enters the avoidance groove 731 after passing through a pre-set through hole in a side wall of the avoidance groove 731, the locking piece 74 is sleeved on the second end of the pin shaft 72 and is threadedly connected with the pin shaft 72, the locking piece 74 is used for being rotated and driven to move along the axial direction to extrude the connecting shaft 71 so as to expand the connecting shaft 71, and then the interference fit between the connecting shaft 71 and the shaft neck of the rotor is realized.
[0027] Herein, the "locking member 74" refers to a structure that is sleeved on the second end of the pin shaft 72 and is threadedly connected with the pin shaft 72. In some embodiments, the locking member 74 is a locking nut, which is convenient to disassemble and assemble by using a conventional tool, and is conducive to improving the convenience of adjusting the driving assembly 7.
[0028] The rotor-stator assembly balance checking device of the application supports the rotor-stator assembly through the support frame 1, and sets a bearing assembly on the support frame 1, connects the front and rear fulcrums of the rotor-stator assembly with the bearing assembly, and connects the bearing assembly with the support frame into an integral structure instead of a split structure to reduce the deflection of the fulcrums. The coaxial arrangement of the front and rear fulcrums of the rotor-stator assembly is realized through the bearing assembly, and the coaxial arrangement of the front and rear fulcrums of the rotor-stator assembly is ensured through the support frame 1 and the bearing assembly, and the process of adjusting the radial and axial clearances of the rotor-stator assembly is effectively simplified, which is directly ensured by the support frame and is more accurate in positioning. The rotor is connected with the balancing machine through the driving assembly 7. The first end of the connecting shaft 71 of the driving assembly 7 can be inserted into the shaft neck of the rotor and is in interference fit with the shaft neck. The driving shaft 73 provided at the second end of the connecting shaft 71 can be externally connected with the balancing machine and is overlapped by the driving belt of the balancing machine. The first end of the pin shaft 72 is arranged in the pre-set hollow channel in the connecting shaft 71. The second end of the pin shaft 72 passes through the pre-set through hole in the sidewall of the air-avoiding groove 731 and enters the air-avoiding groove 731. Meanwhile, the locking member 74 is sleeved on the second end of the pin shaft 72 and is threadedly connected with the pin shaft 72. Thus, the pin shaft 72 can be moved by screwing the locking member 74 to press the connecting shaft 71 and make the connecting shaft 71 expand, thereby realizing the interference fit between the connecting shaft 71 and the shaft neck of the rotor. The driving assembly 7 of the application is of an expansion type, which has a more simplified structure, smaller mass under the condition of meeting the rigidity, better centering effect, and ensures the coaxial positioning of the connecting shaft 71 and the rotor, avoids the introduction of large driving unbalance, and is more convenient to install, which can effectively solve the assembly problem that the driving wheel needs to be first assembled into the spline shaft from the rear end, then the core rod is placed in the spline shaft from the front end by using an elongated rod, and finally the core rod is tightened by using a nut at the rear end, and more than two persons are not needed for assembly, which avoids the radial and axial jumping of the rotor and the tool from affecting the installation of the rotor, avoids the installation from the front end into the inner cavity, and greatly reduces the assembly labor intensity and amount.
[0029] Preferably, as shown in Figure 9 The hollow channel of the connecting shaft 71 is a taper hole structure, and the diameter of the hollow channel gradually decreases from the first end to the second end of the connecting shaft 71. The outer wall of the pin shaft 72 is a taper surface structure to cooperate with the hollow channel.
[0030] It can be understood that, due to the tapered structure of the outer wall of the pin shaft 72, the hollow channel matched with the tapered hole structure can realize the expansion of the connecting shaft 71 during the pulling movement of the pin shaft 72, and the interference fit between the connecting shaft 71 and the positioning surface of the rotor shaft neck is realized.
[0031] Preferably, referring to Figure 9 , the outer wall of the connecting shaft 71 is provided with a deformation groove 711.
[0032] It can be understood that, in order to realize the smooth expansion of the connecting shaft 71 and improve the expansion deformation range of the connecting shaft 71, the thickness of the connecting shaft 71 at the deformation groove 711 is smaller, so that the deformation is easier to occur; and the existence of the deformation groove 711 can also improve the friction between the connecting shaft 711 and the rotor joint surface, further improving the connection stability of the connecting shaft 71 and the rotor.
[0033] Preferably, referring to Figure 9 , the driving assembly 7 further comprises a positioning piece 75, and the second end of the connecting shaft 71 is provided with a positioning groove, and the positioning piece 75 is arranged at one end of the driving shaft 73 close to the connecting shaft 71, and the positioning piece 75 is used for cooperating with the positioning groove to realize the circumferential limiting of the driving shaft 73 and the connecting shaft 71.
[0034] It can be understood that, the driving shaft 73 is connected with the connecting shaft 71 through the positioning piece 75 and is circumferentially limited, which can realize the simple and convenient installation and cooperation of the driving shaft 73 and the connecting shaft 71, and realize stable limiting. The positioning piece 75 can be arranged in a ring array, and a plurality of positioning pieces 75 can be arranged to improve the stability of the connection and limiting.
[0035] Optionally, the positioning piece 75 is a positioning pin, which is conducive to reducing the manufacturing and maintenance and replacement cost.
[0036] It should be noted that, referring to Figure 3 , the flow chart two shows the state diagram of the stator assembly, the driving wheel needs to be first installed into the spline shaft from the rear end, then the core rod is placed in the spline shaft from the front end by using the extension rod, and finally the core rod is tightened by using the nut at the rear end. The driving wheel is installed conveniently and cooperates with the shaft neck with a gap of 0.1, and can only be assembled according to the steps of “first installing into the spline shaft from the rear end, then placing the core rod in the spline shaft from the front end by using the extension rod, and finally tightening the core rod by using the nut at the rear end”. The core rod is a T-shaped stepped shaft, and one person needs to first install the core rod on the extension rod and assemble it into the rotor inner cavity from the front end, while the large end of the core rod completely blocks the hole of the spline shaft and the small end of the core rod, and the second person needs to check at the rear end of the rotor to help the small end of the core rod into the hole of the spline shaft; moreover, the extension rod of the core rod is long and heavy, and is easy to touch the inner cavity of the part during installation.
[0037] In this application, the drive assembly 7 first installs the pin 72 inside the connecting shaft 71, then installs the rotor journal, aligns the positioning part 75, installs the drive shaft 73 and the locking part 74. The whole process only requires one person and is completely within the field of vision, which is more convenient and can also effectively avoid the problem of the inner cavity of the rotor-stator assembly parts being easily touched during the installation of the drive assembly 7.
[0038] Preferably, please refer to Figure 1 As shown, the first end and the second end of the support frame 1 are respectively provided with a first support step 13 and a second support step 14. The bearing assembly includes a first bearing 2 provided on the first support step 13 and a second bearing 3 provided on the second support step 14. The first bearing 2 and the second bearing 3 are coaxially arranged.
[0039] It is understandable that the support frame 1 supports the first bearing 2 and the second bearing 3 respectively through the first support step 13 and the second support step 14, and makes the first bearing 2 and the second bearing 3 coaxial, thereby realizing the coaxiality of the front and rear support points of the rotor-stator assembly and effectively ensuring the accuracy of dynamic balance.
[0040] Optionally, both the first bearing 2 and the second bearing 3 are saddle bearings. The bearing assembly also includes a bearing fixing member 4. Specifically, the bearing fixing member 4 is a fixing bolt. The bearing fixing member 4 is used to pass through the preset mounting holes on the first bearing 2 and the second bearing 3 and then cooperate with the preset mounting screw holes on the support frame 1 to achieve a tight connection between the first bearing 2 and the second bearing 3, and to prevent the rotor from falling off the support frame 1 due to centrifugal force.
[0041] Preferably, please refer to Figure 1 As shown, a limiting cavity is provided inside the support frame 1. The limiting cavity is used to limit the movement of the stator assembly. The bottom of the limiting cavity is provided with a stator front positioning platform 15 and a stator rear support step 16. The stator front positioning platform 15 is used to support and limit the stator, and the stator rear support step 16 is used to support the rear end of the stator. The stator assembly balance verification device also includes a stator limiting pin 5. The stator limiting pin 5 is used to pass through the limiting hole preset in the side wall of the limiting cavity and abut against the front end of the stator, thereby pressing the stator against the stator rear support step 16.
[0042] Understandably, the support frame 1 supports both the rotor and stator simultaneously through the limiting cavity. The first bearing 2 and the second bearing 3 at the front and rear of the support frame 1 are saddle bearings, which ensure that the rotor's front and rear journals, bearings, or bearings are coaxial with the bearing housing, reducing the impact on balance caused by misalignment of the bearing housing when mounted on the swing frame. The width of the stator rear support step 16 is greater than the actual width of the stator support area, thus allowing the stator limiting member 5 to pass through the pre-set limiting hole in the side wall of the limiting cavity and abut against the side wall of the stator, ensuring that the axial position of the rotor and stator remains constant and does not shift.
[0043] Optionally, a clearance groove 18 is provided on the stator front positioning platform 15 of the support frame 1, which is used to avoid the belt overlapping the drive shaft 73. A planar support platform 17 is provided at the bottom of the support frame 1 to facilitate cooperation with other platforms such as balancing machines. In addition, a lifting ring 6 is provided at the top of the support frame 1 to facilitate the hoisting of the support frame 1 and the rotating stator assembly. The runout of other mating surfaces of the support frame 1 outside the support platform 17 is no greater than 0.01, to reduce the impact on the dynamic balancing process.
[0044] Preferably, please refer to Figure 8 As shown, the support frame 1 includes a connecting component 19 and a first support plate and a second support plate spaced apart. The first support plate has a stator rear support step 16. The connecting component 19 is used to connect and limit the first support plate and the second support plate. The connecting component 19 is also used to drive multiple stator limiting members 5 to move synchronously so as to simultaneously abut against the side wall of the stator.
[0045] Understandably, by connecting and limiting the two support plates through the connecting component 19 to form the overall frame of the support frame 1, the support of the counter-rotating stator assembly can be achieved. This also significantly reduces the overall mass of the support frame 1 while maintaining rigidity during low-speed balancing. Simultaneously, the connecting component 19 can drive multiple stator limiting members 5 to move synchronously and simultaneously abut against the sidewalls of the stator, eliminating the need to adjust the position of each stator limiting member 5 individually, thus greatly improving the efficiency of adjusting multiple stator limiting members 5.
[0046] In this preferred embodiment, the connecting assembly 19 includes a connecting rod 191, a limiting plate 192, a first locking member 193, and a second locking member 194. The connecting rod 191 passes through a pre-set connecting hole on the first support plate and the second support plate to connect them. The first locking member 193 is sleeved on the connecting rod 191 and located inside the first support plate or the second support plate. The limiting plate 192 is sleeved on the connecting rod 191 and located outside the second support plate. The limiting plate 192 is used to connect with a plurality of stator limiting members 5. A compression spring 195 is provided between the first support plate and the second support plate. The second locking member 194 is sleeved on the connecting rod 191 and located outside the first support plate and the second support plate. The first locking member 193 and the second locking member 194 are both threadedly connected to the connecting rod 191. The second locking member 194 is used to be turned to push the limiting plate 192 to drive multiple stator limiting members 5 to move and abut against the side wall of the stator. The second locking member 194 is also used to cooperate with the limiting plate 192 and the first locking member 193 to limit the first support plate and the second support plate.
[0047] Understandably, the connecting rod connects two spaced support plates, and the limiting plate, fitted onto the connecting rod, can slide. Connecting the limiting plate to multiple stator limiting components 5 allows for synchronous movement and position adjustment of these components. A compression spring buffers and limits the limiting plate, reducing damage from impacts to the parts caused by the stator limiting components 5. Finally, the first and second locking components lock the limiting plate, support plate, and connecting rod. The connecting assembly 19 connects the support plate and adjusts the multiple stator limiting components 5, significantly improving the assembly and adjustment efficiency of the support frame 1 and the rotating stator assembly, reducing labor. Furthermore, the linkage between the support plate, limiting plate, and stator limiting components 5 effectively ensures the installation stability and axial and radial clearances of the rotating stator assembly. Nuts can be used for the first and second locking components, facilitating adjustment with conventional tools.
[0048] According to another aspect of this application, a method for balancing a rotor-to-stator assembly is also provided. Employing the aforementioned rotor-to-stator assembly balancing verification device, the method includes the following steps: S100: Install the rotor-stator assembly onto the support frame 1 and connect it to the bearing assembly; S200: The rotor is connected to the balancing machine via drive assembly 7; S300: Check the initial imbalance of the moving and stationary components; S400: Rotate the rotor relative to the drive assembly 7 by a preset angle to compensate for the imbalance. S500: Start the balancing machine to perform dynamic balancing.
[0049] In some embodiments, after the rotor and stator are assembled to form a rotor-stator assembly, they are installed on the support frame 1. During the assembly process of the rotor and stator, the rotor is first measured individually to measure the runout of the stop surfaces of each stage of the rotor discs, ensuring that the runout difference between the front and rear discs is less than 0.03 mm. The second stage disc of the multi-stage rotor discs is heated to 300°C to 320°C, and the first and third stage discs are heated to 100°C to 120°C. At the same time, the first and third stage discs are assembled onto the second stage disc. Then, the multi-stage discs are rapidly cooled synchronously to allow the stop surfaces to shrink synchronously and form an interference fit, reducing the phenomenon of the first and third stage discs separating. Subsequently, the connecting bolts are tightened gradually in the order of the five-pointed star to achieve rotor preload balance.
[0050] The rotor-stator assembly balancing verification method of this application also has the aforementioned beneficial effects. It also eliminates the need for separate rotor assembly, balancing checks, and disassembly, shortening the manufacturing cycle and improving efficiency; simplifies the rotor-stator radial and axial clearance adjustment process, directly guaranteed by the support frame 1, resulting in more precise positioning; and, in conjunction with the bearing assembly, unifies the drive positions of the rotor and rotor-stator assembly states, ensuring the coaxiality of the front and rear support points of the rotor-stator assembly and solving the problem of difficult inspection of the front and rear support points of the rotor state; it can also effectively solve the imbalance caused by the introduction of the drive assembly 7, ensuring the accuracy of dynamic balancing.
[0051] Preferably, in step S400, the rotor is rotated 180° relative to the drive assembly 7 to compensate for the imbalance.
[0052] It should be noted that the initial imbalance of the rotor and stator assembly is checked using a balancing machine. The initial imbalance of the rotor is the imbalance in its original state before any mass is added or removed for adjustment. The balancing machine measures the imbalance primarily by sensing centrifugal force. Please refer to [link / reference needed]. Figure 10 Assuming the rotor imbalance is measured as vector N1 on the balancing machine and N2 on the drive assembly 7, the balancing machine is used for compensation. The balancing machine resets the current imbalance to 0, which is equivalent to adding two opposite forces to the rotor. At this time, the rotor imbalance and phase are both considered to be 0. Then, the rotor is rotated 180° relative to the drive assembly 7, and the centrifugal force of the rotor is measured. This completes the compensation of the imbalance and makes the dynamic balance verification more accurate.
[0053] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0054] It should be understood that in the foregoing description of the embodiments in this specification, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the description and aiding in the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this specification. That is, the embodiments in this specification can also be understood as an integration of multiple secondary embodiments. It is also valid when each secondary embodiment contains fewer than all the features of a single foregoing disclosed embodiment.
[0055] Each patent, patent application, publication of the patent application, and other materials such as articles, books, specifications, publications, documents, articles, etc., cited herein may be incorporated by reference. The entire contents used for all purposes, except for any history of prosecution documents associated with it, that may be inconsistent with or conflict with this document, or that may have a limiting effect on the widest extent of the claims, are now or hereafter associated with this document. For example, in the event of any inconsistency or conflict between the description, definition, and / or use of terms associated with any of the included materials and the terms, description, definition, and / or used in connection with this document, the terms used herein shall prevail.
[0056] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments described in this specification. Other modified embodiments are also within the scope of this specification. Therefore, the embodiments disclosed in this specification are merely examples and not limitations. Those skilled in the art can implement the applications described in this specification by adopting alternative configurations based on the embodiments in this specification. Therefore, the embodiments in this specification are not limited to the embodiments precisely described in the application. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this application, and the above technical features can also be combined in an appropriate manner; these improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other occasions without modification, should all be considered as protection of this application.
Claims
1. A rotor-stator assembly balancing verification device, used for balancing the rotor-stator assembly of an aero-engine, the rotor-stator assembly comprising a rotor and a stator, characterized in that, The rotor-stator assembly balancing verification device includes a support frame (1), a bearing assembly, and a drive assembly (7): The support frame (1) is used to support the rotor-stator assembly. The bearing assembly is mounted on the support frame (1) and connected to the support frame (1) as a whole. The bearing assembly is used to support the front and rear support points of the rotor-stator assembly so that the front and rear support points of the rotor-stator assembly are coaxially set. The drive assembly (7) includes a connecting shaft (71), a pin (72), a drive shaft (73), and a locking member (74). The first end of the connecting shaft (71) is configured as an expandable structure for inserting into the journal of the rotor. The drive shaft (73) is located at the second end of the connecting shaft (71). The drive shaft (73) is used to connect to an external balancing machine and to allow the drive belt of the balancing machine to overlap. A clearance groove (731) is provided at the end of the drive shaft (73) away from the connecting shaft (71). The first end of the pin (72) is configured as a tapered structure. The pin (72) is set in a hollow channel within the connecting shaft (71). The second end of the pin (72) passes through a pre-set perforation on the side wall of the clearance groove (731) and enters the clearance groove (731). The locking member (74) is sleeved on the second end of the pin (72) and threadedly connected to the pin (72). The locking member (74) is used to be twisted and rotated to drive the pin (72) to move axially to squeeze the connecting shaft (71) and cause the connecting shaft (71) to expand, thereby achieving an interference fit between the journal of the connecting shaft (71) and the rotor.
2. The balancing verification device for a rotor-stator assembly according to claim 1, characterized in that, The hollow channel of the connecting shaft (71) is a conical hole structure, and the diameter of the hollow channel gradually decreases from the first end of the connecting shaft (71) to the second end. The outer wall of the pin (72) is a conical surface structure to fit with the hollow channel.
3. The balancing verification device for a rotor-stator assembly according to claim 1, characterized in that, The outer wall of the connecting shaft (71) is provided with a deformation groove (711).
4. The balancing verification device for a rotor-stator assembly according to claim 1, characterized in that, The drive assembly (7) also includes a positioning element (75). A positioning groove is provided at the second end of the connecting shaft (71). The positioning element (75) is located at the end of the drive shaft (73) near the connecting shaft (71). The positioning element (75) is used to cooperate with the positioning groove to achieve circumferential positioning of the drive shaft (73) and the connecting shaft (71).
5. The balancing verification device for a rotor-stator assembly according to claim 1, characterized in that, The first end and the second end of the support frame (1) are provided with a first support step (13) and a second support step (14) respectively. The bearing assembly includes a first bearing (2) on the first support step (13) and a second bearing (3) on the second support step (14). The first bearing (2) and the second bearing (3) are coaxially arranged.
6. The balancing verification device for a rotor-stator assembly according to claim 1, characterized in that, A limiting cavity is provided inside the support frame (1). The limiting cavity is used to limit the rotation of the stator assembly. The bottom of the limiting cavity is provided with a stator front positioning platform (15) and a stator rear support step (16). The stator front positioning platform (15) is used to support and limit the stator, and the stator rear support step (16) is used to support the rear end of the stator. The rotation of the stator assembly balance verification device also includes a stator limiting pin (5). The stator limiting pin (5) is used to pass through the limiting hole preset on the side wall of the limiting cavity and abut against the front end of the stator, thereby pressing the stator against the stator rear support step (16).
7. The balancing verification device for a rotor-stator assembly according to claim 6, characterized in that, The support frame (1) includes a connecting component (19) and a first support plate and a second support plate spaced apart. The first support plate has a stator rear support step (16). The connecting component (19) is used to connect and limit the first support plate and the second support plate. The connecting component (19) is also used to drive multiple stator limiting members (5) to move synchronously to simultaneously abut against the side wall of the stator.
8. The balancing verification device for a rotor-stator assembly according to claim 7, characterized in that, The connecting assembly (19) includes a connecting rod (191), a limiting plate (192), a first locking member (193), and a second locking member (194). The connecting rod (191) passes through a pre-set connecting hole on the first support plate and the second support plate to connect the two. The first locking member (193) is sleeved on the connecting rod (191) and located inside the first support plate or the second support plate. The limiting plate (192) is sleeved on the connecting rod (191) and located outside the second support plate. The limiting plate (192) is used to connect with multiple stator limiting members (5). The limiting plate (192) and the second... A compression spring (195) is provided between the support plates. The second locking member (194) is sleeved on the connecting rod (191) and located outside the first support plate and the second support plate. The first locking member (193) and the second locking member (194) are both threadedly connected to the connecting rod (191). The second locking member (194) is used to be screwed to push the limiting plate (192) to drive multiple stator limiting members (5) to move and abut against the side wall of the stator. The second locking member (194) is also used to cooperate with the limiting plate (192) and the first locking member (193) to limit the first support plate and the second support plate.
9. A method for balancing a stator assembly, characterized in that, Using the rotor-stator assembly balance verification device as described in any one of claims 1-8, the rotor-stator assembly balance verification method includes the following steps: S100: Install the rotor-stator assembly onto the support frame (1) and connect it to the bearing assembly; S200: The rotor is connected to the balancing machine via the drive assembly (7); S300: Check the initial imbalance of the moving and stationary components; S400: Rotate the rotor relative to the drive assembly (7) by a preset angle to compensate for the imbalance; S500: Start the balancing machine to perform dynamic balancing.
10. A method for balancing a rotor-stator assembly according to claim 8, characterized in that, In step S400, the rotor is rotated 180° relative to the drive assembly (7) to compensate for the imbalance.