Motor rotor mounting tool

Abstract

The utility model discloses to the technical problem in the installation of micro gas turbine rotor, provide an installation frock and method. The frock sets up the drawing component containing drawing handle etc. in the rotor groove, forms radial tight structure, ensures the stable of rotor, and the rotation drive equipment realizes the rotor uniform -speed rotation and axial movement control, and the cooperation air bearing reduces the friction wear, and the stator subassembly forms the high -efficient electromagnetic conversion structure with permanent magnet, and the cooperation segmented control of rotation drive equipment avoids the installation out of control. In addition, heating equipment precision control coupling heating temperature, satisfy interference fit requirement. The method realizes the rotor high accuracy, no -loss, fast installation through the standardization process. The frock structure is compact, and the operation is convenient, and the installation stability and precision are high, satisfy high -speed motor G1 -level dynamic balance requirement, significantly improve the installation efficiency and reliability, reduce the installation cost and time.

Description

Technical Field

[0001] This utility model relates to the field of micro gas turbine installation technology, and in particular to motor rotor installation fixtures. Background Technology

[0002] Micro gas turbines are a new type of thermal engine with a power range of 25 to 500 kW. They typically employ a regenerative cycle and mainly consist of a centrifugal compressor, a radial turbine, a combustion chamber, a regenerator, and air bearings. They use natural gas, diesel, or other fuels.

[0003] With technological advancements and the emergence of high-speed permanent magnet generators, the connection between the generator and compressor no longer requires a reduction gear mechanism. This significantly reduces the weight and size of the entire unit, resulting in substantial cost reduction. Furthermore, the use of air bearings instead of rolling bearings eliminates the need for a lubrication system, leading to a substantial reduction in the number of parts in the unit and further lower manufacturing costs.

[0004] Meanwhile, the high speed of the high-speed motor, approximately 100,000 revolutions per minute at full load, places high demands on the tolerances of motor manufacturing and assembly. The rotor, which contains strong permanent magnets, generates a large attraction when installed into the coil magnet sheets of the housing. At the same time, during the installation process, the rotor needs to pass through two air bearings. The surfaces of the air bearings are coated with high-temperature resistant and wear-resistant coatings, which requires protection against the rotor during installation.

[0005] To ensure the mechanical stability of the high-speed motor and meet the coaxial alignment requirements, the rotor needs to spiral through the air bearing from top to bottom, and the heated coupling needs to be engaged with the upper assembly surface of the compressor before the temperature drops from 500 degrees Celsius to 350 degrees Celsius. The dynamic balance level after installation needs to reach or approach the G1 level, which places high demands on manufacturing and assembly precision.

[0006] The installation method used in related technologies involves first connecting the rotor coupling to the upper mounting surface of the compressor, and then fitting the motor housing assembly onto the rotor to facilitate the mating of the rotor coupling with the compressor mounting surface. However, this method also presents the following problems: 1. The outer casing of a typical gas turbine is made of aluminum, which is inconvenient to clamp and fix, and cannot apply too much force, as it will damage the surface of the casing; 2. During installation, the contact between the outer casing and the rotor can cause the rotor to swing horizontally due to the magnetic attraction, affecting the installation. 3. During the installation process, friction between the rotor and the air bearing will also occur, damaging the surface coating of the air bearing.

[0007] To improve the installation effect, we propose a motor rotor mounting fixture. Utility Model Content

[0008] Therefore, it is necessary to provide a motor rotor installation fixture and method to address the technical problems in the installation process of high-speed motor rotors for micro gas turbines, such as high tolerance requirements, difficult assembly, easily damaged parts (such as air bearing surface coating and rotor outer surface plating), and difficulty in achieving high precision requirements (such as G1 level) in dynamic balancing. This would make the rotor installation process more stable and accurate, reduce component damage, improve installation efficiency and reliability, and meet the high requirements of high-speed motors for mechanical stability and coaxial alignment.

[0009] The first aspect of this utility model provides a motor rotor installation fixture, including a rotor, a pulling component, a housing, and other core components. A coupling is axially connected to one end of the rotor, and a groove is formed at the other end, containing a permanent magnet. The pulling component, disposed within the rotor groove, includes a pulling handle, a tensioning bolt, and a mating block, which are connected to form a cylindrical structure. A preload is applied radially to the groove at the connection point to ensure the rotor's stability during installation. The housing contains a chamber to accommodate the rotor, and air bearings are installed at both the upper and lower axial ends of the chamber, effectively reducing friction and wear between the rotor and the bearings. This fixture, through the radial tensioning structure of the pulling component and the cooperation of the air bearings, achieves stable rotor installation, avoiding horizontal swaying and component damage during installation, and improving installation accuracy and efficiency.

[0010] In other embodiments, a rotary drive device is also included, which is connected to the drawing component via a chuck to control the uniform rotation and uniform axial movement of the drawing component. The rotary drive device can provide precise speed and position control, ensuring the stability and accuracy of the rotor during installation and avoiding installation failure or component damage due to unstable speed or position deviation.

[0011] In other embodiments, an intake bracket, a compressor, and a fixing clamp are also included. The intake bracket is fixedly connected to the housing, and the compressor is disposed inside the intake bracket, with a mounting surface for mating with the coupling on the side near the rotor; the fixing clamp is press-fitted onto the intake bracket to secure it. This structure ensures the stability and sealing of the intake system, while providing a stable clamping force, preventing loosening and shaking of the housing during installation, and improving the success rate and efficiency of installation.

[0012] In other embodiments, both the pull handle and the mating block have threaded grooves on their shafts to facilitate the passage of the tension bolt, with a nut connected to one end of the tension bolt extending beyond the pull handle. This facilitates subsequent disassembly and, through the nut, increases the preload between the pull handle and the mating block, thereby providing a greater tension force to the rotor and ensuring its stability during installation.

[0013] In other embodiments, a stator assembly corresponding to the permanent magnet is disposed within the housing. The stator assembly includes a stator and coils wound around each other, with the stator ring disposed on the inner wall of the housing. It is made of high-performance magnetic steel sheet material, which improves electromagnetic conversion efficiency and reduces energy loss. The cooperation between the permanent magnet and the stator assembly forms a highly efficient electromagnetic conversion structure, improving the performance of the motor.

[0014] In other embodiments, a heating device is also included for heating the coupling. The heating device employs an electromagnetic heating coil, enabling rapid and uniform heating of the coupling and ensuring precise temperature control. This design satisfies the interference fit requirements between the coupling and the compressor mounting surface, improving the stability and reliability of the installation.

[0015] In other embodiments, the rotary drive device controls the pulling component in segments. The rotary drive device includes interconnected rotating and axial drive devices. The rotating device includes a motor or rotary cylinder, and the axial drive device includes a telescopic cylinder, an electronic push rod, or a hydraulic cylinder. This segmented control method can adjust the rotational speed and axial movement speed in real time according to the rotor's installation progress, ensuring that the rotor can move and rotate axially at a uniform speed during installation, avoiding installation failure or component damage due to unstable speed or positional deviation.

[0016] In other embodiments, air bearings are provided at both the upper and lower axial ends of the housing chamber. The surfaces of the air bearings are coated with high-temperature resistant and wear-resistant coatings, which can effectively reduce friction and wear between the rotor and the bearings, extending the service life of the bearings. At the same time, the use of air bearings also avoids the problems of increased unit parts and manufacturing costs caused by lubrication systems, further reducing the weight and size of the unit. Attached Figure Description

[0017] Figure 1 This is an exploded view of the present invention.

[0018] Figure 2 for Figure 1 The sectional view in the image.

[0019] Figure 3 This is a cross-sectional view of the present invention in its assembled state.

[0020] in: 1. Tightening bolt; 2. Pulling handle; 3. Connecting block; 4. Rotor; 5. Permanent magnet; 6. Coupling; 7. Upper air bearing; 8. Housing; 9. Lower air bearing; 10. Inlet bracket; 101. Fixed section; 11. Compressor; 12. Fixing clamp; 13. Chuck. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] Example 1 like Figures 1-3 As shown, this embodiment discloses a motor rotor mounting fixture, characterized by comprising a rotor 4, a pulling component, a rotary drive device, a housing 8, an air intake bracket 10, and an air compressor. It enables the fixture to be supported from inside the rotor 4 without affecting the plating of the rotor 4 and the air bearing, or the roundness of the rotor 4. Simultaneously, it provides sufficient installation space and clamping positions, resulting in minimal deformation of the rotor 4, preventing damage to the plating on the outer surface of the high-speed motor rotor 4, and without affecting installation, assembly, and dynamic balance, facilitating repeated disassembly and adjustment during the installation process.

[0023] Specifically, such as Figure 1 As shown, in this embodiment, the rotor 4 has a coupling 6 connected to one axial end and a groove opened at the other axial end. A permanent magnet 5 is provided inside the rotor 4.

[0024] Specifically, such as Figure 1 As shown, the pulling component in this embodiment is disposed in the groove of the rotor 4. The groove in this embodiment is pre-set in the rotor 4 and is used to connect the rotor 4 to the fan. During installation, it is used to connect the pulling component to achieve installation. The pulling component includes a pulling handle 2, a tensioning bolt 1, and a connecting block 3 connected to each other. The pulling handle 2 and the connecting block 3 form a cylindrical structure under the connection of the tensioning bolt 1. As the pulling handle 2 and the connecting block 3 approach each other, a pre-tightening force is formed on the radial direction of the groove at the connection between the pulling handle 2 and the connecting block 3. The pulling handle 2 and the connecting block 3 are made of high-strength alloy steel to ensure that they will not deform or break when subjected to large pulling forces.

[0025] In this embodiment, the rotary drive device is connected to the pulling component via a chuck 13, controlling the pulling component to rotate and move axially at a uniform speed. The rotary drive device includes a motor or a rotary cylinder, which can provide precise speed and position control to ensure the stability and accuracy of the rotor 4 during installation.

[0026] Specifically, such as Figure 1 As shown, the housing 8 in this embodiment has a cavity inside that accommodates the rotor 4, and air bearings (upper air bearing 7 and lower air bearing 9) are provided at both the upper and lower ends of the cavity along the axial direction, which can effectively reduce the friction and wear between the rotor 4 and the bearings.

[0027] In this embodiment, the air intake bracket 10 is fixedly connected to the housing 8. The housing 8 and the air intake bracket 10 are fixed together by multiple bolts (not shown in the figure as they are not technically important) to ensure a stable connection with the housing 8 and to ensure the stability and sealing of the air intake system.

[0028] The intake bracket 10 includes a fixed section 101, which is pressed against the fixing clamp 12 to prevent the housing 8 from loosening and affecting the subsequent installation. Loosening of the housing 8 mainly originates from the magnetic force generated by the permanent magnet 5 and the stator assembly, causing the housing 8 to wobble horizontally and affecting the installation. The compressor is housed within the intake bracket 10. The side of the compressor closest to the rotor 4 has a mounting surface for mating with the coupling 6. The mounting surface of the compressor is precision-machined to ensure accurate mating with the coupling 6.

[0029] In this embodiment, the fixing clamp 12 is press-fitted onto the air intake bracket 10 to fix the air intake bracket 10. The fixing clamp 12 adopts a hydraulic drive method, which can provide a stable clamping force to ensure the stability of the air intake bracket 10 during the installation process. The hydraulic drive method has the characteristics of large clamping force and good stability, which can maintain the fixed position of the air intake bracket 10 during the installation process, avoid installation failure due to vibration or displacement, and improve the success rate and efficiency of installation.

[0030] In this embodiment, after the pulling component and rotor 4 are installed, the connecting surface of the pulling handle 2 and the docking block 3 is located in the groove, which can provide a larger preload to the rotor 4, making it less likely for the rotor 4 to wobble when it contacts the stator assembly. The connecting surface of the pulling handle 2 and the docking block 3 forms an acute angle with the radial plane of the pulling handle 2. This acute angle design can increase the contact area of ​​the connecting surface, improve the uniformity of the preload distribution, and enable the pulling handle 2 and the docking block 3 to form a larger contact area when connected, thereby improving the uniformity of the preload distribution, avoiding loosening or damage to the connection due to local stress concentration, and improving the connection stability and reliability between the pulling component and the rotor 4.

[0031] At the same time, such as Figures 1-3 As shown in this embodiment, in order to increase the tensioning force, the longitudinal section of the docking block 3 is triangular, so that the pull handle 2 and the docking block 3 can provide a greater radial preload under a certain tensioning force.

[0032] In this embodiment, the shafts of both the pull handle 2 and the docking block 3 are provided with threaded grooves to facilitate the passage of the tension bolt 1. The end of the tension bolt 1 extending out of the pull handle 2 is connected to a nut. By providing an outwardly extending nut, subsequent disassembly can be facilitated, and the preload between the pull handle 2 and the docking block 3 can be increased by the nut, thereby providing a greater tension force to the rotor 4.

[0033] In this embodiment, a stator assembly corresponding to the permanent magnet 5 is provided inside the housing 8; the stator assembly includes a stator and a coil wound around each other, the stator is ringed on the inner wall of the housing 8, the stator is made of high-performance magnetic steel sheet material, which can improve electromagnetic conversion efficiency and reduce energy loss. In order to further improve rotation efficiency, the axial height of the permanent magnet 5 is the same as the axial height of the stator assembly.

[0034] In this embodiment, a heating device is also included for heating the coupling 6; the heating device adopts an electromagnetic heating coil, which can quickly and evenly heat the coupling 6 and ensure precise control of the heating temperature.

[0035] In this embodiment, the rotary drive device controls the pulling component in segments. The rotary drive device includes a rotary device and an axial drive device connected to each other. The rotary device includes a motor or a rotary cylinder, and the axial drive device includes a telescopic cylinder, an electronic push rod, or a hydraulic cylinder. The segmented control method can adjust the rotation speed and axial movement speed in real time according to the installation progress of the rotor 4, ensuring that the rotor 4 can move and rotate axially at a uniform speed during the installation process.

[0036] Example 2 This embodiment discloses a method for installing a micro gas turbine rotor. Addressing the issues of easy scratching of the air bearing surface and the significant attraction between the permanent magnet 5 and the magnetic steel sheets in the stator assembly, a rotor fixing fixture is used to heat the coupling 6 at the bottom of the rotor 4 without damaging the outer surface plating or deforming the rotor 4 structure. The coupling 6 is then evenly spiraled downwards and passed through the two air bearings within 30 seconds, ultimately securing it into the compressor assembly surface. Specifically, the installation method in this embodiment uses the micro gas turbine rotor installation fixture from Embodiment 1 and includes the following steps: Tooling installation steps: Combine the pull handle 2 with the docking block 3, install the combined pull component in the groove of the rotor 4 by tightening bolt 1, and fix the pull component to the rotary drive equipment by chuck 13; the chuck 13 adopts a high-precision three-jaw chuck, which can provide stable clamping force and accurate positioning to ensure a solid connection between the pull component and the rotary drive equipment.

[0037] Housing fixing steps: Use fixing clamp 12 to clamp and fix the air intake bracket 10; the fixing clamp 12 adopts hydraulic drive, which can provide stable clamping force, maintain the fixed position of the air intake bracket 10 during installation, avoid installation failure due to vibration or displacement, and ensure a stable connection between the air intake bracket 10 and the housing 8.

[0038] Rotary drive equipment setting steps: Based on the measured height distance, control the axial movement speed and rotation speed of rotor 4; the rotary drive equipment adopts a segmented control method, which can adjust the rotation speed and axial movement speed in real time according to the installation progress of rotor 4, ensuring the stability and accuracy of the installation process (the segmented control method can adjust the output torque and speed of the rotary drive equipment in real time according to the change of magnetic attraction between rotor 4 and stator assembly, realize the uniform movement and rotation of rotor 4, thereby avoiding excessive friction between rotor 4 and air bearing, as well as the inability to control the installation time of coupling 6 and compressor, the inability to accurately control the time, and the inability to control the temperature).

[0039] Coupling heating step: The coupling 6 is heated to a predetermined temperature using a heater. In this embodiment, the predetermined temperature is the theoretical installation temperature plus an additional temperature value to compensate for heat decay over time. In this embodiment, the heating temperature is 500℃±10℃, while the actual installation temperature required is 350℃. The excess is the temperature decaying over time. The heater uses an electromagnetic heating coil, which can quickly and evenly heat the coupling 6, ensuring precise control of the heating temperature.

[0040] Rotor installation steps: Start the rotary drive equipment to rotate the rotor 4 downwards along the central axis, so that the rotor 4 passes through the upper air bearing 7, the housing 8, and the lower air bearing 9, until the bottom plane of the compressor end of the coupling 6 is tightly fitted with the corresponding interference surface on the compressor. The rotor 4 is installed in a spiral downwards manner during the installation process, which can ensure uniform contact between the rotor 4 and the air bearing, avoid bearing damage caused by local stress concentration, and allow the rotor 4 to gradually contact the air bearing during the installation process, reducing the impact force caused by sudden contact, protecting the surface coating of the air bearing, extending the service life of the bearing, and ensuring a stable connection between the rotor 4 and the compressor, thereby improving the overall performance and reliability of the gas turbine.

[0041] Specifically, in the tooling installation steps: after assembling the pull handle 2 and the mating block 3, place washers, connect using the tension bolt 1, insert the pull handle 2 into the groove of the rotor 4, and finally tighten the tension bolt 1 using a 6mm Allen wrench to a torque of 12N±1N. Since the pull component is connected to the rotary drive device via the chuck 13, and the rotor 4 is tensioned with the pull component, achieving a tension torque of 12N±1N ensures that the tensioning force is greater than the magnetic attraction force, preventing radial movement of the rotor 4 and potential collision with the air bearing. Precise control of the tension torque ensures a stable connection between the pull component and the rotor 4, preventing installation failure or component damage due to loose connections, improving installation success rate and efficiency, reducing operational instability and component wear caused by vibration or noise, and extending the tooling's service life.

[0042] In the setting step of the rotary drive device, it is necessary to control the axial movement driving force and rotational speed of the rotary drive device in segments, including: First segment: Before the lower end of the permanent magnet 5 approaches the stator assembly of the housing 8, the rotary drive device drives the rotor 4 to move axially and rotate at a constant speed. In this segment, since it is only subject to the gravity of the rotor 4 and the pulling component, it is only necessary to apply a reaction force to overcome the gravity to ensure that the rotor 4 moves forward at a constant speed, which makes it easy to adjust.

[0043] The second stage: The lower end of permanent magnet 5 approaches the stator assembly - the lower end of permanent magnet 5 approaches half the height of the stator assembly. In this stage, an upward nonlinear reaction force needs to be applied to the rotary drive device to overcome the magnetic attraction between permanent magnet 5 and stator assembly, and the applied force gradually increases. The second stage control can gradually overcome the magnetic attraction between permanent magnet 5 and stator assembly, ensuring that rotor 4 maintains a stable motion state when entering the magnetic field of stator assembly. In the second stage control, the rotary drive device gradually applies an upward reaction force according to the change of magnetic attraction between permanent magnet 5 and stator assembly, ensuring that rotor 4 can overcome the influence of magnetic attraction when entering the magnetic field of stator assembly, maintain a stable motion state, avoid rapid displacement or collision of components due to excessive magnetic attraction, and improve the stability and accuracy of installation. At the same time, since the magnetic force between permanent magnet 5 and stator assembly is determined by the size of the connection surface, a specific magnetic force value can be obtained based on the magnetic force formula. As the contact surface increases, the magnetic force will also increase. When the rotary drive device moves axially, an additional reaction force is needed to overcome the influence of this magnetic force. In addition, since the permanent magnet 5 is in contact with the stator assembly along the axial direction, it will also be affected by the rotational force. Therefore, it is necessary to add a reaction force on the rotation drive device to prevent the rotor 4 from rotating too fast.

[0044] The third segment: The lower end of permanent magnet 5 is close to half the height of the stator assembly. In this segment, an upward nonlinear reaction force needs to be applied to the rotary drive device to overcome the magnetic attraction between permanent magnet 5 and the stator assembly. The applied force gradually decreases. As the magnetic force between permanent magnet 5 and the stator also slowly decreases, the applied force also needs to be reduced slowly.

[0045] Fourth stage: The lower end of permanent magnet 5 is close to the lower end of the stator assembly - the lower end of permanent magnet 5 is parallel to the lower end of the stator assembly, and a stable force is applied downwards to make coupling 6 and compressor mounting surface interference fit; the fourth stage control can ensure that coupling 6 and compressor mounting surface are tightly fitted to form a solid connection, improve the overall performance and reliability of gas turbine. In the fourth stage control, the rotary drive equipment applies a stable force downwards to ensure that coupling 6 and compressor mounting surface are interference fit, forming a solid connection.

[0046] In the coupling heating process: The coupling 6 is heated using an electromagnetic heating coil, and its temperature is monitored in real time using a temperature gun to ensure it reaches 500℃±10℃. By combining the measured height of the coupling 6 and the axial movement speed of the rotor 4, the connection time between the coupling 6 and the compressor mounting surface can be determined. Based on the natural decay of the heated coupling 6 within this time, the connection temperature between the coupling 6 and the mounting surface can be obtained. The electromagnetic heating coil features rapid and uniform heating, enabling the coupling 6 to reach the preset temperature quickly while avoiding material deformation or damage due to localized overheating. This improves heating stability and reliability, ensures smooth installation, extends the service life of the coupling 6, and reduces maintenance costs.

[0047] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A motor rotor mounting fixture, characterized in that, include: The rotor has a coupling connected to one axial end and a groove opened at the other axial end. A permanent magnet is installed inside the rotor. A pulling component is disposed in a groove of the rotor. The pulling component includes a pulling handle, a tensioning bolt, and a mating block that are connected to each other. The pulling handle and the mating block form a cylindrical structure under the connection of the tensioning bolt. As the pulling handle and the mating block approach each other, a preload force is formed on the radial direction of the groove at the connection between the pulling handle and the mating block. The housing has an internal chamber for accommodating the rotor; After the pulling component and the rotor are installed, the connecting surface of the pulling handle and the docking block is located in the groove, and the connecting surface of the pulling handle and the docking block forms an acute angle with the radial plane of the pulling handle.

2. The motor rotor mounting fixture according to claim 1, characterized in that, Also includes: A rotary drive device, which is connected to the drawing component via a chuck, controls the uniform rotation and uniform axial movement of the drawing component.

3. The motor rotor mounting fixture according to claim 1, characterized in that, Also includes: The air intake bracket is fixedly connected to the housing. The compressor is installed inside the air intake bracket, and the side of the compressor near the rotor is provided with a mounting surface that mates with the coupling; A fixing clamp is press-fitted onto the intake bracket to secure it.

4. The motor rotor mounting fixture according to claim 1, characterized in that, Both the pull handle and the connecting block have threaded grooves on their shafts to facilitate the passage of the tension bolt, and the end of the tension bolt extending out of the pull handle is connected to a nut.

5. The motor rotor mounting fixture according to claim 1, characterized in that, The housing contains a stator assembly corresponding to the permanent magnet.

6. The motor rotor mounting fixture according to claim 1, characterized in that, It also includes heating equipment for heating the coupling.

7. The motor rotor mounting fixture according to claim 2, characterized in that, The rotary drive device controls the pulling component in segments. The rotary drive device includes a rotary device and an axial drive device that are connected to each other. The rotary device includes a motor or a rotary cylinder, and the axial drive device includes a telescopic cylinder, an electronic push rod, or a hydraulic cylinder.

8. The motor rotor mounting fixture according to claim 1, characterized in that, Air bearings are provided at both the upper and lower ends of the housing cavity along the axial direction.

Images