Testing device and method for researching thermally-induced synchronous vibration instability characteristic of cantilever rotor

Abstract

The invention discloses a test device and method for studying the thermally induced synchronous vibration instability characteristic of a cantilever rotor, the test device comprises a cantilever rotor bearing system, a driving system, an oil supply temperature adjusting system and a characteristic parameter measuring system, a main shaft is supported by a driving end bearing and a non-driving end bearing, a rolling bearing is embedded in the driving end bearing, and the non-driving end bearing is embedded in the rolling bearing. A sliding elliptical bearing upper bush and a sliding elliptical bearing lower bush are embedded in a non-driving end bearing, a gear oil pump is adopted for supplying oil, a journal temperature sensor is embedded in the position, 2 mm away from the surface, of the center of a journal, and real-time data of the circumferential temperature difference of the journal can be obtained on the premise that the dynamic characteristics of a rotor are not affected; the test device supports continuous adjustment of parameters such as the position of a cantilever wheel disc, the rotating speed of the rotor, the unbalance amount of the rotor, oil supply pressure and oil supply temperature so as to comprehensively research the influence of related parameters on the thermally-induced synchronous vibration instability characteristic of the cantilever rotor.

Description

Technical Field

[0001] The invention belongs to the field of rotor bearing system characteristic test equipment, and in particular relates to a test equipment and method for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor. Background Art

[0002] In high-speed rotor-bearing systems, thermally induced synchronous rotor instability, also known as the Morton effect, often occurs. This phenomenon is most common in flexible cantilever rotors with large cantilever mass and supported by oil film bearings, which seriously restricts the development of rotating machinery to higher speeds. Although some rotor-bearing systems meet the design standards, there have been several cases of excessive rotor vibration caused by thermally induced synchronous rotor instability. The vibration characteristics of the rotor-bearing system directly affect the safety and reliability of the entire unit operation.

[0003] Due to the uneven viscous shear stress of the oil film between the bearing and the journal, the temperature difference in the circumferential direction of the journal causes thermal deformation, and the cantilever rotor is prone to thermally induced synchronous vibration instability. If the Morton effect is taken into account from the design stage of the cantilever rotor, and the key structural parameters of the cantilever rotor are optimized in combination with the later operating parameters, it will be more conducive to suppressing the Morton effect and further improving the operating stability of the rotating machinery.

[0004] The linear velocity and vortex state of the journal directly determine the size and distribution of the viscous shear stress of the oil film, which in turn affects the circumferential temperature distribution of the journal. The linear velocity of the journal of some previous rotor test benches was too low, and the circumferential temperature distribution in the middle position of the journal could not be effectively observed. In order to better suppress the thermally induced synchronous vibration instability of the cantilever rotor and combine it with the theory, it is urgent to explore the occurrence mechanism of thermally induced synchronous vibration instability of the cantilever rotor in the experiment. For this purpose, a test bench is designed according to the thermally induced synchronous vibration instability characteristics of the cantilever rotor. Summary of the invention

[0005] In view of the above problems, the present invention provides a test device and method for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor. The position of the center of gravity of the cantilever rotor extension section can be changed by continuously adjusting the position of the cantilever pulley, and the rotor speed, rotor imbalance, oil supply pressure and oil supply temperature parameters can be changed. Test data is acquired through a series of temperature sensors and eddy current displacement sensors. The speed increase and decrease curves of the main shaft, the vortex trajectory of the journal and the circumferential temperature distribution of the journal are obtained through data processing, so as to realize the study of the thermally induced synchronous vibration instability characteristics of the cantilever rotor.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor, including a cantilever rotor bearing system, a drive system, an oil supply temperature regulation system and a characteristic parameter measurement system; The cantilever rotor bearing system includes a main shaft, an inner span wheel disc, a cantilever wheel disc, a drive end bearing and a non-drive end bearing. The main shaft is supported by the drive end bearing and the non-drive end bearing. The inner span wheel disc is welded to the main shaft. The cantilever wheel disc is located at the non-drive end and is connected by a tightening sleeve. The drive system includes a servo drive motor, a motor bracket and a servo driver. The servo drive motor is arranged on the motor bracket. The computer sends a control signal, and the servo drive controls the speed of the servo drive motor. The oil supply temperature adjustment system includes a temperature control oil tank, a gear oil pump, a pressure gauge and an oil supply temperature sensor. The pressure gauge and the oil supply temperature sensor are used to monitor the oil supply pressure and oil supply temperature in real time. The characteristic parameter measurement system includes a driving end eddy current displacement sensor, a non-driving end eddy current displacement sensor, an eddy current displacement sensor bracket, a journal temperature sensor, a bearing temperature sensor, a wireless telemetry temperature acquisition module, a wireless telemetry temperature battery module and a data acquisition card. The driving end eddy current displacement sensor, the non-driving end eddy current displacement sensor, the bearing temperature sensor and the oil supply temperature sensor are connected to the data acquisition card through wires, and then sent to a computer via wires by the data acquisition card. The journal temperature sensor is connected to the wireless telemetry temperature acquisition module through wires and sent to the computer via wireless transmission. The wireless telemetry temperature battery module supplies power to the wireless telemetry temperature acquisition module.

[0007] A further improvement of the present invention is that, in the cantilever rotor bearing system, a connecting shaft is provided at the driving end of the main shaft and a keyway is provided, which is connected to the servo drive motor through an elastic coupling, a groove is provided at the driving end of the main shaft, and a driving end eddy current displacement sensor is arranged vertically above the groove for real-time measurement of the rotor speed, the driving end eddy current displacement sensor is arranged on the eddy current displacement sensor bracket, and a stepped shaft is provided at the driving end of the main shaft to limit the rolling bearing.

[0008] A further improvement of the present invention is that, in the cantilever rotor bearing system, the cantilever section of the main shaft to the right side of the inner wheel disc of the span is a hollow rotor, 6 journal temperature measuring holes are evenly opened in the circumferential direction at the center position of the journal supported by the non-drive end bearing, two wire through holes are opened at the main shaft on the right side of the inner wheel disc of the span, and two rectangular grooves are opened on the inner wheel disc of the span for placing a wireless telemetry temperature acquisition module and a wireless telemetry temperature battery module.

[0009] A further improvement of the present invention is that the outer diameter of the main shaft is between 200 and 300 mm, the length of the main shaft is between 2200 and 2500 mm, the rotor mass between the drive end bearing and the non-drive end bearing is the inner-span mass, and the rest is the outer-span mass, and the mass ratio of the outer-span to the inner-span is between 1 and 1.3.

[0010] A further improvement of the present invention is that, in the characteristic parameter measurement system, the journal temperature sensor is pre-buried in the journal temperature measuring hole 2 mm away from the journal surface, fixed by gluing, and the journal surface is polished to be smooth, the temperature sensor wire is led out through the hollow main shaft and the wire through hole, and connected to the wireless telemetry temperature acquisition module; the wireless telemetry temperature acquisition module communicates with the computer via WiFi signals.

[0011] A further improvement of the present invention is that, in the cantilever rotor bearing system, the drive end bearing includes a drive end bearing seat, a drive end bearing cover, a rolling bearing, a drive end bearing left baffle and a drive end bearing right baffle, a drive end bearing lifting hole is arranged on the drive end bearing cover, the drive end bearing seat and the drive end bearing cover are connected by bolts, and the rolling bearing is fixed to the drive end bearing seat by the drive end bearing left baffle.

[0012] A further improvement of the present invention is that in the cantilever rotor bearing system, the non-drive end bearing comprises a non-drive end bearing seat, a non-drive end bearing cover, a sliding elliptical bearing upper bushing, a sliding elliptical bearing lower bushing, an oil supply flange interface, an oil outlet flange interface, an oil retaining ring and an oil box; A non-drive end bearing hoisting hole is arranged on the non-drive end bearing cover, the non-drive end bearing cover and the non-drive end bearing seat are connected by bolts, the non-drive end bearing seat is provided with an oil supply channel, and the oil supply channel is connected to the oil supply flange interface; The non-drive end bearing seat and the lower bushing of the sliding elliptical bearing are provided with a bushing temperature measuring hole, and the bushing temperature sensor is placed 4 mm away from the lower bushing of the sliding elliptical bearing; The non-driving end bearing seat and the lower bush of the sliding elliptical bearing are positioned by means of positioning pins. The non-driving end bearing seat is provided with an oil outlet channel, which is connected to the oil outlet flange interface. The upper bushing of the sliding elliptical bearing and the lower bushing of the sliding elliptical bearing are positioned by means of positioning pins and connected by means of hexagon socket bolts; The outer ring of the oil retaining ring is provided with an annular groove for collecting oil droplets thrown off the main shaft. The oil box is used to collect the lubricating oil overflowing from the oil retaining ring. The lower part of the oil box is provided with an oil outlet hole connected to a hose to discharge the lubricating oil to the temperature control oil tank.

[0013] A further improvement of the present invention is that, in the characteristic parameter measurement system, the non-driving end eddy current displacement sensor is distributed on both sides of the non-driving end bearing, respectively arranged in the vertical and horizontal directions, and the non-driving end eddy current displacement sensor is fixed on the eddy current displacement sensor bracket.

[0014] A further improvement of the present invention is that, in the oil supply temperature adjustment system, the temperature of the lubricating oil is adjusted by a temperature control oil tank, the gear oil pump pumps the lubricating oil from the temperature control oil tank to the oil supply flange interface, and flows into the temperature control oil tank through the oil outlet flange interface, a pressure gauge is arranged near the oil supply flange interface, and an oil supply temperature sensor is pasted on the outer side of the oil supply flange interface pipe wall.

[0015] The test method for studying the characteristics of thermally induced synchronous vibration instability of a cantilever rotor comprises the following steps: Step 1: First, dynamically balance the cantilever rotor bearing system to ensure safe and stable operation of the test bench; Step 2: Start the oil supply temperature adjustment system and the characteristic parameter measurement system, and supply oil to the non-drive end bearing through the gear oil pump; Step 3, start the drive system, the main shaft in the cantilever rotor bearing system starts to work under the drive of the servo drive motor, the computer sends a control signal, the servo drive controls the speed of the servo drive motor, and gradually increases the speed of the servo drive motor; Step 4: Signal transmission is performed through a data acquisition card and a wireless telemetry temperature acquisition module to obtain the spindle speed-time curve, the displacement-time curve of each measuring point, and the temperature-time curve test data of each measuring point; Step 5, adjusting relevant test parameters, including continuously adjusting the cantilever wheel disc position to change the center of gravity position of the cantilever rotor extension section, changing the rotor speed, rotor unbalance, oil supply pressure and oil supply temperature parameters, and testing and recording and saving relevant test data; Step 6: Process the test data to obtain the speed increase / deceleration curve of the spindle, the vortex trajectory of the journal, and the circumferential temperature distribution of the journal.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The test device and method for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor provided by the present invention include a cantilever rotor bearing system, a drive system, an oil supply temperature adjustment system and a characteristic parameter measurement system. The outer diameter of the main shaft is between 200 and 300 mm. When the rotation speed is 5000 r / min, the journal linear speed can easily reach 50 m / s, thereby forming a higher viscous shear stress of the oil film. The operating speed of the rotor can be monitored in real time by an eddy current displacement sensor at the driving end, the vortex state and dynamic response of the rotor can be monitored in real time by an eddy current displacement sensor at the non-driving end, the circumferential temperature distribution of the journal can be monitored in real time by a temperature sensor arranged circumferentially at the middle position of the journal, and the position of the cantilever wheel can be changed to change the position of the center of gravity of the cantilever section, and the oil supply pressure and oil supply temperature of the lubricating oil can be changed to adjust the operating parameters of the rotor bearing system, so as to study the instability characteristics of the thermally induced synchronous vibration of the cantilever rotor.

[0017] Furthermore, the present invention adopts a tightening sleeve to connect the cantilever wheel disc and the rotor, thereby ensuring a stable connection and convenient disassembly of the cantilever wheel disc and the rotor.

[0018] Furthermore, the present invention installs a wireless telemetry temperature acquisition module and a wireless telemetry temperature battery module on the inner wheel disc of the span, which are sent to the computer via WiFi signals, which can effectively avoid the problem of rotating mechanical wire winding and will not affect the dynamic characteristics of the cantilever rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 Schematic diagram of a rotor bearing test system in an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the T-block structure embedded in the guide rail base in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the main shaft structure in an embodiment of the present invention, wherein Figure 3 (a) is the main view, Figure 3 (b) is a side view. Figure 3 (c) Figure 3 (a) AA view, Figure 3 (d) Figure 3 (a) BB view, Figure 3 (e) Figure 3 (a) CC view, Figure 3 (f) Figure 3 (a) DD view.

[0023] Figure 4 This is a schematic diagram of the structure of the inner wheel disc in the embodiment of the present invention. Figure 4 (a) Figure 3 (b) EE view, Figure 4 (b) Figure 3 (b) FF view.

[0024] Figure 5 It is a schematic diagram of the cantilever wheel structure in an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the drive end bearing structure in an embodiment of the present invention. Figure 6 (a) is a schematic diagram of the structure. Figure 6 (b) is a cross-sectional view.

[0026] Figure 7This is a schematic diagram of the non-drive end bearing structure in an embodiment of the present invention. Figure 7 (a) is a schematic diagram of the structure. Figure 7 (b) is a cross-sectional view.

[0027] Figure 8 Schematic diagram of the internal structure of the non-drive end bearing in an embodiment of the present invention.

[0028] Fig. 9 It is a schematic diagram of the structure of the sliding elliptical bearing pad in an embodiment of the present invention.

[0029] Fig.10 Schematic diagram of the structure of the oil deflector ring in an embodiment of the present invention.

[0030] Fig.11 Schematic diagram of the oil box structure in an embodiment of the present invention.

[0031] Fig.12 Schematic diagram of the oil supply temperature adjustment system in an embodiment of the present invention.

[0032] Fig.13 Schematic diagram of a characteristic parameter measurement system in an embodiment of the present invention.

[0033] Description of reference numerals: 1-servo drive motor; 2-motor bracket; 3-elastic coupling; 4-eddy current displacement sensor bracket; 5-drive end eddy current displacement sensor; 6-drive end bearing; 601-drive end bearing seat; 602-drive end bearing cover; 603-drive end bearing left baffle; 604-drive end bearing right baffle; 605-rolling bearing; 606-drive end bearing lifting hole; 7-spindle; 701-connecting shaft; 702-groove; 703-wire through hole; 704-journal temperature sensor; 705-journal temperature measuring hole; 706-step shaft; 8-span inner wheel disc; 801-wire telemetry temperature acquisition module; 802-wire telemetry temperature battery module; 803-bolt hole; 804-balance screw hole; 9-non-drive end bearing; 901-non-drive end bearing seat; 902-non-drive end bearing cover; 903 -Non-drive end bearing lifting hole; 904-oil retaining ring; 905-oil supply flange interface; 906-oil outlet flange interface; 907-oil box; 908-sliding elliptical bearing upper shell; 909-sliding elliptical bearing lower shell; 910-locating pin; 911-bearing shell temperature measuring hole; 912-bearing shell temperature sensor; 913-oil supply channel; 914-oil outlet channel; 915-hexagon socket bolt; 916-locating pin; 917-annular groove; 918-oil outlet hole; 919-pressure gauge; 920-oil supply temperature sensor; 921-temperature control oil tank; 922-gear oil pump; 10-cantilever pulley; 101-balance screw hole; 102-lifting hole; 11-expansion sleeve; 12-guide rail base; 13-T-block; 131-No. 1 threaded hole; 132-No. 2 threaded hole; 14-non-drive end eddy current displacement sensor. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0042] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Example 1 like Figure 1 As shown, the present invention provides a test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor, comprising a cantilever rotor bearing system, a drive system, an oil supply temperature adjustment system and a characteristic parameter measurement system.

[0044] The cantilever rotor bearing system includes a main shaft 7, an inner span wheel disc 8, a cantilever wheel disc 10, a drive end bearing 6 and a non-drive end bearing 9. The main shaft 7 is supported by the drive end bearing 6 and the non-drive end bearing 9. The drive end bearing 6 is embedded with a rolling bearing 605. The non-drive end bearing 9 is embedded with a sliding elliptical bearing upper bush 908 and a sliding elliptical bearing lower bush 909. The inner span wheel disc 8 is welded to the main shaft 7. The cantilever wheel disc 10 is located at the non-drive end and is connected by a tightening sleeve 11. The position of the cantilever wheel disc can be adjusted by disassembling and assembling the tightening sleeve to study the influence of the center of gravity position of the cantilever section on the thermally induced synchronous vibration instability characteristics of the cantilever rotor.

[0045] The drive system includes a servo drive motor 1, a motor bracket 2 and a servo driver. The computer sends a control signal, and the servo driver controls the speed of the servo drive motor 1 to study the influence of the rotor speed on the thermally induced synchronous vibration instability characteristics of the cantilever rotor. The speed range is 0~8000r / min.

[0046] like Fig.12 As shown, the oil supply temperature regulation system includes a temperature control oil tank 921, a gear oil pump 922, a pressure gauge 919 and an oil supply temperature sensor 920. The pressure gauge 919 and the oil supply temperature sensor 920 can monitor the oil supply pressure and the oil supply temperature in real time. The temperature of the lubricating oil is regulated by the temperature control oil tank 921, and the speed of the gear oil pump 922 is controlled to regulate the oil supply pressure, so as to study the influence of the oil supply temperature and the oil supply pressure on the thermally induced synchronous vibration instability characteristics of the cantilever rotor.

[0047] like Fig.13As shown, the characteristic parameter measurement system includes a driving end eddy current displacement sensor 5, a non-driving end eddy current displacement sensor 14, an eddy current displacement sensor bracket 4, a journal temperature sensor 704, a bearing temperature sensor 912, a wireless telemetry temperature acquisition module 801, a wireless telemetry temperature battery module 802 and a data acquisition card.

[0048] The non-drive end eddy current displacement sensor 14 is distributed on both sides of the non-drive end bearing 9 , respectively arranged in the vertical and horizontal directions, and the non-drive end eddy current displacement sensor 14 is fixed on the eddy current displacement sensor bracket 4 .

[0049] like Figure 1 , Figure 2 As shown, a T-block 13 is embedded inside the guide rail base 12, and a No. 1 threaded hole 131 of M12 specification and a No. 2 threaded hole 132 of M16 specification are opened in the T-block 13 to adapt to connecting bolts of different specifications. The motor bracket 2, the drive end bearing seat 601, the non-drive end bearing seat 901 and the eddy current displacement sensor bracket 4 are all fixed on the guide rail base 12 and connected to the T-block 13 by bolts.

[0050] like Figure 3 As shown, the driving end of the main shaft 7 is provided with a connecting shaft 701 and a keyway, as shown in the cross-sectional view AA. It is connected to the servo drive motor 1 through the elastic coupling 3. A groove 702 is provided at the driving end of the main shaft 7, as shown in the cross-sectional view BB. A driving end eddy current displacement sensor 5 is arranged vertically above the groove 702 for real-time measurement of the rotor speed. The driving end eddy current displacement sensor 5 is arranged on the eddy current displacement sensor bracket 4. A step shaft 706 is provided at the driving end of the main shaft 7 to limit the rolling bearing 605.

[0051] In addition, the cantilever section of the main shaft 7 to the right side of the inner wheel disc 8 is a hollow rotor, and 6 journal temperature measuring holes 705 are evenly opened in the circumferential direction at the center position of the journal supported by the non-drive end bearing 9, as shown in the cross-sectional view DD. Two wire through holes 703 are opened on the main shaft 7 on the right side of the inner wheel disc 8, as shown in the cross-sectional view CC. Two rectangular grooves are opened on the inner wheel disc 8 for placing the wireless telemetry temperature acquisition module 801 and the wireless telemetry temperature battery module 802.

[0052] Specifically, the outer diameter of the main shaft 7 is 200 mm, the length of the main shaft 7 is 2210 mm, the rotor mass between the drive end bearing 6 and the non-drive end bearing 9 is the inner span mass, and the rest is the outer span mass. The mass ratio between the outer span and the inner span is 1.2. The journal temperature sensor 704 is embedded in the journal temperature measuring hole 705 at a distance of 2 mm from the journal surface, fixed by gluing, and the journal surface is polished to be smooth. The temperature sensor wire is led out through the hollow main shaft 7 and the wire through hole 703, and connected to the wireless telemetry temperature acquisition module 801.

[0053] like Figure 4 , Figure 5 As shown, bolt holes 803 are provided inside the rectangular groove on the inner span wheel disc 8 for fixing the wireless telemetry temperature acquisition module 801 and the wireless telemetry temperature battery module 802, and balancing screw holes 804 are provided on both sides of the inner span wheel disc 8, balancing screw holes 101 are provided on both sides of the cantilever wheel disc 10, and two lifting holes 102 with an interval of 180° are provided in the axial middle position of the cantilever wheel disc 10. By installing balancing screws in the balancing screw holes 101, the influence of the unbalance amount on the thermally induced synchronous vibration instability characteristics of the cantilever rotor is studied.

[0054] like Figure 6 As shown, the drive end bearing 6 includes a drive end bearing seat 601, a drive end bearing cover 602, a rolling bearing 605, a drive end bearing left baffle 603 and a drive end bearing right baffle 604. A drive end bearing hanging hole 606 is arranged on the drive end bearing cover 602. The drive end bearing seat 601 and the drive end bearing cover 602 are connected by bolts. The rolling bearing 605 is fixed to the drive end bearing seat 601 by the drive end bearing left baffle 603. The drive end bearing left baffle 603 and the drive end bearing right baffle 604 also act as oil seals to prevent the grease in the drive end bearing 6 from overflowing.

[0055] like Figure 7 As shown, the non-drive end bearing 9 includes a non-drive end bearing seat 901, a non-drive end bearing cover 902, a sliding elliptical bearing upper bushing 908, a sliding elliptical bearing lower bushing 909, an oil supply flange interface 905, an oil outlet flange interface 906, an oil retaining ring 904 and an oil box 907. A non-drive end bearing hanging hole 903 is arranged on the non-drive end bearing cover 902. The non-drive end bearing cover 902 and the non-drive end bearing seat 901 are connected by bolts. The non-drive end bearing seat 901 is provided with an oil supply channel 913, which is connected to the oil supply flange interface 905. The oil supply channel 913 adopts a circular cross-section converted to a rectangular cross-section.

[0056] In addition, a bearing temperature measuring hole 911 is provided on the non-drive end bearing seat 901 and the sliding elliptical bearing lower shell 909, and the bearing temperature sensor 912 is placed 4 mm away from the surface of the sliding elliptical bearing lower shell 909. The non-drive end bearing seat 901 and the sliding elliptical bearing lower shell 909 are positioned by a positioning pin 910, and the non-drive end bearing seat 901 is provided with an oil outlet channel 914, which is connected to the oil outlet flange interface 906. The sliding elliptical bearing upper shell 908 and the sliding elliptical bearing lower shell 909 are positioned by a positioning pin 916 and connected by a hexagon socket bolt 915, and the bearing clearance is 2‰ of the shaft neck diameter.

[0057] like Fig.10 , Fig.11As shown, the outer ring of the oil retaining ring 904 is provided with an annular groove 917 for collecting oil drops thrown off the main shaft 7. The oil box 907 is used to collect the lubricating oil overflowing from the oil retaining ring 904. The lower part of the oil box 907 is provided with an oil outlet 918 connected to a hose to discharge the lubricating oil to the temperature control oil tank 921. The oil outlet 918 and the hose can be fixed with a metal lock.

[0058] Example 2 The specific steps for studying the thermally induced synchronous vibration instability characteristics of cantilever rotors are described in detail below: Step 1: First, the cantilever rotor bearing system is dynamically balanced and debugged by installing balancing screws in the inner span wheel disc 8 and the cantilever wheel disc 10 to ensure the safe and stable operation of the test bench. Step 2 and subsequent steps are test steps; Step 2, start the oil supply temperature adjustment system and the characteristic parameter measurement system, supply oil to the non-drive end bearing 9 through the gear oil pump 922, adjust the lubricating oil temperature through the temperature control oil tank 921, the gear oil pump 922 pumps lubricating oil from the temperature control oil tank 921 to the oil supply flange interface 905, controls the speed of the gear oil pump 922 to adjust the oil supply pressure, and flows into the temperature control oil tank 921 through the oil outlet flange interface 906, a pressure gauge 919 is provided near the oil supply flange interface 905, and an oil supply temperature sensor 920 is attached to the outer side of the pipe wall of the oil supply flange interface 905; Step 3, start the drive system, the main shaft 7 in the cantilever rotor bearing system starts to work under the drive of the servo drive motor 1, the computer sends a control signal, the servo drive controls the speed of the servo drive motor 1, and gradually increases the speed of the servo drive motor 1, and the maximum speed is 8000r / min; Step 4: According to the signals transmitted by the data acquisition card and the wireless telemetry temperature acquisition module 801, the speed-time curve of the main shaft 7, the displacement-time curve of each measuring point and the temperature-time curve test data of each measuring point are obtained; the driving end eddy current displacement sensor 5, the non-driving end eddy current displacement sensor 14, the bearing temperature sensor 912 and the oil supply temperature sensor 920 are connected to the data acquisition card through wires, and then sent to the computer by the data acquisition card through wires; the journal temperature sensor 704 is connected to the wireless telemetry temperature acquisition module 801 through wires, and sent to the computer through WiFi signals; the wireless telemetry temperature battery module 802 supplies power to the wireless telemetry temperature acquisition module 801; Step 5, adjusting relevant test parameters, including continuously adjusting the position of the cantilever wheel disc 10 to change the center of gravity position of the cantilever rotor extension section, changing the rotor speed, rotor unbalance, oil supply pressure and oil supply temperature parameters, and testing and recording and saving relevant test data; Step 6: Process the test data to obtain the speed increase and decrease curve of the main shaft 7, the vortex trajectory of the journal, and the circumferential temperature distribution of the journal, so as to study the influence of relevant parameters on the thermally induced synchronous vibration instability characteristics of the cantilever rotor.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0060] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor, characterized in that: It includes cantilever rotor bearing system, drive system, oil supply temperature regulation system and characteristic parameter measurement system; The cantilever rotor bearing system comprises a main shaft (7), an inner span wheel disc (8), a cantilever wheel disc (10), a drive end bearing (6) and a non-drive end bearing (9), wherein the main shaft (7) is supported by the drive end bearing (6) and the non-drive end bearing (9), the inner span wheel disc (8) is welded to the main shaft (7), and the cantilever wheel disc (10) is located at the non-drive end and is connected by expansion sleeves (11); The drive system comprises a servo drive motor (1), a motor bracket (2) and a servo driver. The servo drive motor (1) is arranged on the motor bracket (2). A control signal is sent by a computer, and the rotation speed of the servo drive motor (1) is controlled via the servo driver. The oil supply temperature adjustment system comprises a temperature control oil tank (921), a gear oil pump (922), a pressure gauge (919) and an oil supply temperature sensor (920), wherein the pressure gauge (919) and the oil supply temperature sensor (920) are used to monitor the oil supply pressure and oil supply temperature in real time; The characteristic parameter measurement system comprises a driving end eddy current displacement sensor (5), a non-driving end eddy current displacement sensor (14), an eddy current displacement sensor bracket (4), a journal temperature sensor (704), a bearing temperature sensor (912), a wireless remote sensing temperature acquisition module (801), a wireless remote sensing temperature battery module (802) and a data acquisition card. The driving end eddy current displacement sensor (5), the non-driving end eddy current displacement sensor (14), the bearing temperature sensor (912) and the oil supply temperature sensor (920) are connected to the data acquisition card via wires, and then sent to a computer via the wires by the data acquisition card. The journal temperature sensor (704) is connected to the wireless remote sensing temperature acquisition module (801) via wires, and sent to the computer via wireless transmission. The wireless remote sensing temperature battery module (802) supplies power to the wireless remote sensing temperature acquisition module (801).

2. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In a cantilever rotor bearing system, a connecting shaft (701) is provided at the driving end of a main shaft (7) and is provided with a keyway, and is connected to a servo drive motor (1) via an elastic coupling (3); a groove (702) is provided at the driving end of the main shaft (7); a driving end eddy current displacement sensor (5) is arranged vertically above the groove (702) for real-time measurement of the rotor speed; the driving end eddy current displacement sensor (5) is arranged on an eddy current displacement sensor bracket (4); and a stepped shaft (706) is provided at the driving end of the main shaft (7) for limiting the rolling bearing (605).

3. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 2, characterized in that: In a cantilever rotor bearing system, a cantilever section of a main shaft (7) to the right side of an inner wheel disc (8) is a hollow rotor, six shaft neck temperature measuring holes (705) are evenly opened in a circumferential direction at the center position of a shaft neck supported by a non-drive end bearing (9), two wire through holes (703) are opened at the main shaft (7) on the right side of the inner wheel disc (8), and two rectangular grooves are opened on the inner wheel disc (8) for accommodating a wireless telemetry temperature acquisition module (801) and a wireless telemetry temperature battery module (802).

4. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 2, characterized in that: The outer diameter of the main shaft (7) is between 200 and 300 mm, the length of the main shaft (7) is between 2200 and 2500 mm, the mass of the rotor between the drive end bearing (6) and the non-drive end bearing (9) is the inner span mass, and the rest is the outer span mass, and the ratio of the outer span mass to the inner span mass is between 1 and 1.

3.

5. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In the characteristic parameter measurement system, a journal temperature sensor (704) is pre-buried in a journal temperature measuring hole (705) at a distance of 2 mm from the journal surface, fixed by gluing, and the journal surface is ground to be smooth; a temperature sensor wire is led out through a hollow spindle (7) and a wire through hole (703) and connected to a wireless remote sensing temperature acquisition module (801); the wireless remote sensing temperature acquisition module (801) communicates with a computer via a WiFi signal.

6. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In the cantilever rotor bearing system, the drive end bearing (6) comprises a drive end bearing seat (601), a drive end bearing cover (602), a rolling bearing (605), a drive end bearing left baffle (603) and a drive end bearing right baffle (604); the drive end bearing seat (601) and the drive end bearing cover (602) are connected by bolts, and the rolling bearing (605) is fixed on the drive end bearing seat (601) by the drive end bearing left baffle (603).

7. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In the cantilever rotor bearing system, the non-drive end bearing (9) comprises a non-drive end bearing seat (901), a non-drive end bearing cover (902), a sliding elliptical bearing upper bushing (908), a sliding elliptical bearing lower bushing (909), an oil supply flange interface (905), an oil outlet flange interface (906), an oil retaining ring (904) and an oil box (907); The non-drive end bearing cover (902) and the non-drive end bearing seat (901) are connected by bolts, and the non-drive end bearing seat (901) is provided with an oil supply passage (913), and the oil supply passage (913) is connected to the oil supply flange interface (905); A bearing shell temperature measuring hole (911) is provided on the non-drive end bearing seat (901) and the lower shell of the sliding elliptical bearing (909), and a bearing shell temperature sensor (912) is placed 4 mm away from the lower shell of the sliding elliptical bearing (909); The non-drive end bearing seat (901) and the lower shell of the sliding elliptical bearing (909) are positioned by means of a positioning pin (910); the non-drive end bearing seat (901) is provided with an oil outlet passage (914), and the oil outlet passage (914) is connected to the oil outlet flange interface (906); The upper bearing (908) of the sliding elliptical bearing and the lower bearing (909) of the sliding elliptical bearing are positioned by means of a positioning pin (916) and connected by means of a hexagon socket bolt (915); The outer ring of the oil deflector (904) is provided with an annular groove (917) for collecting oil drops thrown off the main shaft (7). The oil box (907) is used to collect lubricating oil overflowing from the oil deflector (904). The lower part of the oil box (907) is provided with an oil outlet hole (918) connected to a hose to discharge the lubricating oil to the temperature control oil tank (921).

8. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In the characteristic parameter measurement system, the non-driving end eddy current displacement sensors (14) are distributed on both sides of the non-driving end bearing (9), respectively arranged in the vertical and horizontal directions, and the non-driving end eddy current displacement sensors (14) are fixed on the eddy current displacement sensor bracket (4).

9. The test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to claim 1, characterized in that: In the oil supply temperature regulation system, the temperature of the lubricating oil is regulated by a temperature control oil tank (921), a gear oil pump (922) pumps the lubricating oil from the temperature control oil tank (921) to an oil supply flange interface (905), and the lubricating oil flows into the temperature control oil tank (921) through an oil outlet flange interface (906), a pressure gauge (919) is provided near the oil supply flange interface (905), and an oil supply temperature sensor (920) is attached to the outer side of the pipe wall of the oil supply flange interface (905).

10. A test method for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor, characterized in that: The method is based on the test device for studying the thermally induced synchronous vibration instability characteristics of a cantilever rotor according to any one of claims 1 to 9, and comprises the following steps: Step 1: First, dynamically balance the cantilever rotor bearing system to ensure safe and stable operation of the test bench; Step 2: Start the oil supply temperature adjustment system and the characteristic parameter measurement system, and supply oil to the non-drive end bearing through the gear oil pump; Step 3, start the drive system, the main shaft in the cantilever rotor bearing system starts to work under the drive of the servo drive motor, the computer sends a control signal, the servo drive controls the speed of the servo drive motor, and gradually increases the speed of the servo drive motor; Step 4: Signal transmission is performed through a data acquisition card and a wireless telemetry temperature acquisition module to obtain the spindle speed-time curve, the displacement-time curve of each measuring point, and the temperature-time curve test data of each measuring point; Step 5, adjusting relevant test parameters, including continuously adjusting the cantilever wheel disc position to change the center of gravity position of the cantilever rotor extension section, changing the rotor speed, rotor unbalance, oil supply pressure and oil supply temperature parameters, and testing and recording and saving relevant test data; Step 6: Process the test data to obtain the speed increase / deceleration curve of the spindle, the vortex trajectory of the journal, and the circumferential temperature distribution of the journal.

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