CN114674558A - Device and method for testing dynamic characteristics of radial aerodynamic bearing - Google Patents
Device and method for testing dynamic characteristics of radial aerodynamic bearing Download PDFInfo
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- CN114674558A CN114674558A CN202210300208.XA CN202210300208A CN114674558A CN 114674558 A CN114674558 A CN 114674558A CN 202210300208 A CN202210300208 A CN 202210300208A CN 114674558 A CN114674558 A CN 114674558A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of testing, in particular to a device and a method for testing the dynamic characteristics of a radial aerodynamic bearing, wherein the device for testing the dynamic characteristics of the radial aerodynamic bearing comprises a mechanical system, an air system, an oil lubricating system and a test and control system; the mechanical system comprises a machine shell, a volute shell, a turbine, a nozzle ring, a bearing shell, two radial bearings, an axial bearing, a rotor, a sensor module and an excitation device; through air system drive turbine and rotor rotation, exciting arrangement exerts the pulling force to the bearing that awaits measuring, reach the critical value when exerting the pulling force, the sensor module can detect the bearing temperature that awaits measuring and moment of torsion and rise greatly suddenly, the pulling force of observing and controlling the system under the critical point record is the biggest bearing capacity of the bearing that awaits measuring under this rotational speed promptly, the bearing capacity of the bearing that awaits measuring under the rotor maximum rotational speed can be surveyed to the rotational speed of air input regulation rotor that changes air system, adopt the rotatory mode of turbine drive rotor, make the highest rotational speed of rotor can reach 220000rpm, make test data more comprehensive.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a device and a method for testing dynamic characteristics of a radial aerodynamic bearing.
Background
The gas dynamic pressure bearing has the advantages of no need of lubrication, high efficiency, high temperature resistance and the like, is an important support technology for the development of rotary machinery to high-end equipment, and is an important support technology for realizing new-generation energy power such as supercritical carbon dioxide cycle power generation, micro gas turbines, ultralow temperature refrigeration, deep space nuclear power generation and the like. However, because gas has extremely low viscosity and strong compressibility, and a double-medium lubrication system consisting of an elastic bearing and a gas film shows strong nonlinear coupling characteristics, the mathematical model is difficult to build and low in accuracy, and key technical indexes such as bearing capacity, high-temperature performance, stability, start-stop service life and the like of a gas dynamic pressure bearing mechanism need a large number of tests to verify.
Disclosure of Invention
The invention aims to provide a device and a method for testing dynamic characteristics of a radial aerodynamic bearing, and aims to solve the problem that the conventional testing device cannot exceed 100000rpm to cause incomplete test data when testing the aerodynamic bearing.
In order to achieve the above object, in a first aspect, the present invention provides a device for testing dynamic characteristics of a radial aerodynamic bearing, including a mechanical system, an air system, an oil system, and a measurement and control system;
the mechanical system comprises a machine shell, a volute, a turbine, a nozzle ring, a bearing shell, two radial bearings, an axial bearing, a rotor, a sensor module and an excitation device; the housing has a loading chamber; the volute is fixedly connected with the shell and is positioned on the inner side of the shell; the turbine is rotationally connected with the volute and is positioned on the inner side of the volute; the nozzle ring is fixedly connected with the volute and is positioned in the volute; the bearing shell is fixedly connected with the shell and is positioned on the inner side of the shell; the two radial bearings are respectively and fixedly connected with the bearing shell and are respectively positioned on the inner side of the bearing shell; the axial bearing is fixedly connected with the bearing shell and is positioned on the inner side of the bearing shell; the rotor is fixedly connected with the turbine and penetrates through the two radial bearings and the axial bearing; the sensor module is fixedly connected with the shell and is positioned on the side edge of the shell; the excitation device is fixedly connected with the shell and is positioned on one side of the shell; the air system is communicated with the volute, the loading cavity and one side of the shell; the lubricating oil system is communicated with the bearing shell and is positioned on one side of the bearing shell; the measurement and control system is electrically connected with the sensor module and the excitation device respectively and is positioned on one side of the sensor module.
The sensor module comprises a torque sensor, a temperature sensor, a rotating speed sensor and an axis track sensor; the torque sensor is fixedly connected with the shell, is electrically connected with the measurement and control system and is positioned on the side edge of the shell; the temperature sensor is fixedly connected with the shell, electrically connected with the measurement and control system and positioned on the side edge of the shell; the rotating speed sensor is fixedly connected with the shell, is electrically connected with the measurement and control system and is positioned on the side edge of the shell; the axle center track sensor is fixedly connected with the casing, is electrically connected with the measurement and control system and is positioned on the side edge of the casing.
The air system comprises an air source, a main air pipe, a throttling regulating valve, a vacuum pump, a first air pipe, a positive pressure regulating valve, a second air pipe, a negative pressure regulating valve and a first air pressure sensor; the main air pipe is respectively communicated with the air source and the volute and is positioned between the air source and the volute; the throttling regulating valve is fixedly connected with the main air pipe and is positioned on one side of the main air pipe; the vacuum pump is positioned on one side of the gas source; the first air pipe is respectively communicated with the vacuum pump and the loading cavity and is positioned between the vacuum pump and the loading cavity; the positive pressure regulating valve is fixedly connected with the first air pipe and is positioned on one side of the first air pipe; the second air pipe is respectively communicated with the main air pipe and the loading cavity and is positioned between the main air pipe and the loading cavity; the negative pressure regulating valve is fixedly connected with the second air pipe and is positioned on the side edge of the second air pipe; the first air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
Wherein the air system further comprises a second air pressure sensor; the second air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
Wherein the air system further comprises a third air pressure sensor; the third air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
In a second aspect, the present invention further provides a method for testing dynamic characteristics of a radial aerodynamic bearing, including:
fixedly connecting a measured main shaft to the rotor, sleeving a bearing to be measured on the measured main shaft, and connecting the sensor module with the bearing to be measured;
starting a lubricating oil system, and conveying lubricating oil to the two radial bearings and the axial bearing;
starting an air system to drive the turbine and the rotor to rotate, so that the rotor reaches the rotating speed required to be measured, and the air pressure in the loading cavity reaches the required test pressure;
starting an excitation device to apply tension to a bearing to be tested, gradually increasing the tension and recording the temperature, torque and axis locus of the bearing under different tensions, when the tension is increased to the extent that the bearing to be tested cannot bear the tension, the bearing to be tested is in contact friction with a main shaft to be tested, at the moment, a sensor module can detect that the temperature and the torque of the bearing to be tested are suddenly increased in proportion increased along with the increase of the tension when the bearing to be tested does not normally run, and the tension recorded by a measurement and control system at a critical point is the maximum bearing capacity of the bearing to be tested under the rotating speed and the environmental pressure;
and changing the air inflow of the air system to adjust the rotating speed of the rotor, and then testing until the bearing capacity of the bearing to be tested at the maximum rotating speed of the rotor to be tested under the environmental pressure is measured.
The invention relates to a device and a method for testing dynamic characteristics of a radial air dynamic pressure bearing, wherein a lubricating oil system consists of an oil tank, an oil supply pump, an overflow valve, a pressure regulating valve, an oil return pump, a heater and a cooler, the oil supply pump pumps lubricating oil in the oil tank to two radial bearings and axial bearings for lubrication, the oil return pump pumps the lubricating oil back to the oil tank to realize circulation, and the heater and the cooler are used for regulating the oil temperature; when a bearing to be measured is tested, a main shaft to be measured is fixedly connected to the rotor, the bearing to be measured is sleeved on the main shaft to be measured, the sensor module is connected with the bearing to be measured, the lubricating oil system is started, lubricating oil is conveyed to the two radial bearings and the axial bearing to lubricate the two radial bearings and the axial bearing, and then the air system is started, and the air system provides air meeting the power requirement of the turbine for driving the turbine to rotate so that the turbine and the rotor can reach the rotating speed required to be measured; the excitation device is a device capable of exciting the bearing to be tested, a tension cylinder or a vibration exciter and the like can be adopted, selection is carried out according to test requirements, the excitation device is started to apply tension to the bearing to be tested, the bearing to be tested is in contact friction with a main shaft to be tested when the bearing to be tested cannot bear the tension, the temperature and the torque of the bearing to be tested can suddenly rise at the moment, the sensor module comprises a plurality of sensors, and when the sensor module detects that the temperature and the torque of the bearing to be tested suddenly jump and rise according to the proportion increased along with the increase of the tension when the sensor module normally operates, the tension recorded by the measurement and control system at a critical point is the maximum bearing capacity of the bearing to be tested at the rotating speed; adjusting the rotating speed of the rotor by changing the air inflow of the air system, and then testing until the bearing capacity of the bearing to be tested at the maximum rotating speed of the rotor to be tested is measured; the turbine is adopted to drive the rotor to rotate, the turbine is directly connected with the tested spindle, the coupling and the speed change device are omitted, the specifications of the two radial bearings, the axial bearing and the turbine can be replaced according to the size of the tested bearing, the maximum rotating speed of the rotor can reach 220000rpm, the takeoff rotating speed test under each working condition within the rotating speed of 220000rpm and the bearing capacity test under each rotating speed are realized, and the test data are more comprehensive.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a radial aerodynamic bearing dynamic characteristic testing device according to the present invention.
Fig. 2 is a top view of the mechanical system of the present invention.
Fig. 3 is a cross-sectional view of the mechanical system of the present invention.
Fig. 4 is a schematic of the mechanical and air systems of the present invention.
Fig. 5 is a schematic view of the configuration of the lubricating oil system of the present invention.
FIG. 6 is a flow chart of a method for testing the dynamic characteristics of a radial aerodynamic bearing according to the present invention.
1-mechanical system, 2-air system, 3-lubricating oil system, 4-measurement and control system, 5-main shaft to be measured, 6-bearing to be measured, 11-machine shell, 12-volute, 13-turbine, 14-nozzle ring, 15-bearing shell, 16-radial bearing, 17-axial bearing, 18-rotor, 19-sensor module, 21-air source, 22-main air pipe, 23-throttling regulating valve, 24-vacuum pump, 25-first air pipe, 26-positive pressure regulating valve, 27-second air pipe, 28-negative pressure regulating valve, 211-first air pressure sensor, 31-oil tank, 32-oil supply pump, 33-overflow valve, 34-pressure regulating valve, 35-oil return pump, 36-heater, 37-cooler, 110-excitation device, 111-loading cavity, 191-torque sensor, 192-temperature sensor, 193-rotating speed sensor, 194-axial locus sensor, 210-second air pressure sensor, 29-third air pressure sensor, 213-first air filter and 214-second air filter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are mainly directed to a bearing capacity test of a test bearing, are exemplary, are intended to explain the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 6, the present invention provides a radial aerodynamic bearing dynamic characteristic testing apparatus: the system comprises a mechanical system 1, an air system 2, an oil system 3 and a measurement and control system 4;
the mechanical system 1 comprises a machine shell 11, a volute 12, a turbine 13, a nozzle ring 14, a bearing shell 15, two radial bearings 16, an axial bearing 17, a rotor 18, a sensor module 19 and an excitation device 110; the housing 11 has a loading chamber 111; the volute 12 is fixedly connected with the casing 11 and is positioned on the inner side of the casing 11; the turbine 13 is rotatably connected with the volute 12 and is positioned inside the volute 12; the nozzle ring 14 is fixedly connected with the scroll casing 12 and is positioned inside the scroll casing 12; the bearing shell 15 is fixedly connected with the machine shell 11 and is positioned on the inner side of the machine shell 11; the two radial bearings 16 are respectively and fixedly connected with the bearing shell 15 and are respectively positioned on the inner side of the bearing shell 15; the axial bearing 17 is fixedly connected with the bearing shell 15 and is positioned on the inner side of the bearing shell 15; the rotor 18 and the turbine 13 are fixedly connected and penetrate through the two radial bearings 16 and the axial bearing 17; the sensor module 19 is fixedly connected with the casing 11 and is positioned on the side of the casing 11; the excitation device 110 is fixedly connected with the casing 11 and is positioned at one side of the casing 11; the air system 2 is communicated with the volute 12, communicated with the loading cavity 111 and positioned at one side of the machine shell 11; the lubricating oil system 3 is communicated with the bearing shell 15 and is positioned on one side of the bearing shell 15; the measurement and control system 4 is electrically connected with the sensor module 19 and the excitation device 110 respectively, and is located on one side of the sensor module 19.
In this embodiment, the lubricating oil system 3 is composed of an oil tank 31, an oil supply pump 32, an overflow valve 33, a pressure regulating valve 34, an oil return pump 35, a heater 36 and a cooler 37, the oil supply pump 32 pumps the lubricating oil in the oil tank 31 to the two radial bearings 16 and the axial bearing 17 for lubrication, the oil return pump 35 pumps the lubricating oil back to the oil tank 31 for circulation, and the heater 36 and the cooler 37 are used for regulating the oil temperature; when the bearing 6 to be tested is tested, the main shaft to be tested is fixedly connected to the rotor 18, the bearing 6 to be tested is sleeved on the main shaft to be tested, the sensor module 19 is connected with the bearing 6 to be tested, the lubricating oil system 3 is started, lubricating oil is conveyed to the two radial bearings 16 and the axial bearing 17 to lubricate the two radial bearings 16 and the axial bearing 17, the air system 2 is started, the air system 2 provides air meeting the power requirement of the turbine 13 for driving the turbine 13, so that the turbine 13 and the rotor 18 rotate, the rotor 18 reaches the rotating speed required to be measured, and the air system 2 can also adjust the atmospheric pressure in the loading cavity 111 to enable the bearing 6 to be tested to be in the working environment pressure required by the test; the excitation device 110 is a device capable of exciting the bearing 6 to be tested, a tension cylinder or a vibration exciter can be adopted, the selection is carried out according to the test requirement, the excitation device 110 is started to apply tension to the bearing 6 to be tested, the bearing 6 to be tested is in contact friction with the main shaft 5 to be tested when the bearing 6 to be tested cannot bear the tension, the temperature and the torque of the bearing 6 to be tested can suddenly rise at the moment, the sensor module 19 is composed of a plurality of sensors, when the sensor module 19 detects that the temperature and the torque of the bearing 6 to be tested suddenly rise greatly (namely, the sudden jump rise is not carried out according to the proportion increased along with the increase of the tension during normal operation), the tension recorded by the measurement and control system 4 at the critical point is the maximum bearing capacity of the bearing 6 to be tested at the rotating speed; adjusting the rotating speed of the rotor 18 by changing the air inflow of the air system 2, and then testing until the bearing capacity of the bearing 6 to be tested at the maximum rotating speed of the rotor 18 to be tested is measured; the mode that the turbine 13 drives the rotor 18 to rotate is adopted, the rotor 18 is directly connected with a tested spindle, the two radial bearings 16, the axial bearing 17 and the turbine 13 are replaced according to the size of the tested bearing without a coupling and a speed change device, so that the maximum rotating speed of the rotor 18 can reach 220000rpm, the takeoff rotating speed test under each working condition within the rotating speed of 220000rpm and the bearing capacity test under each rotating speed are realized, and the test data are more comprehensive.
Further, the sensor module 19 includes a torque sensor 191, a temperature sensor 192, a rotation speed sensor 193, and an axial trace sensor 194; the torque sensor 191 is fixedly connected with the casing 11, electrically connected with the measurement and control system 4, and positioned on the side of the casing 11; the temperature sensor 192 is fixedly connected with the casing 11, electrically connected with the measurement and control system 4, and positioned on the side of the casing 11; the rotating speed sensor 193 is fixedly connected with the casing 11, electrically connected with the measurement and control system 4, and located on the side of the casing 11; the axle center trace sensor 194 is fixedly connected with the housing 11, electrically connected with the measurement and control system 4, and located on the side of the housing 11.
In this embodiment, the torque sensor 191 is used for detecting the torque of the bearing to be detected 6, the temperature sensor 192 is used for detecting the temperature of the bearing to be detected 6, the rotation speed sensor 193 is used for detecting the rotation speed of the bearing to be detected 6, and the axle center track sensor 194 is used for detecting the axle center track of the bearing to be detected 6.
Further, the air system 2 includes an air source 21, a main air pipe 22, a throttle valve 23, a vacuum pump 24, a first air pipe 25, a positive pressure regulating valve 26, a second air pipe 27, a negative pressure regulating valve 28, and a first air pressure sensor 211; the main air pipe 22 is respectively communicated with the air source 21 and the volute 12 and is positioned between the air source 21 and the volute 12; the throttle regulating valve 23 is fixedly connected with the main air pipe 22 and is positioned on one side of the main air pipe 22; the vacuum pump 24 is positioned at one side of the gas source 21; the first gas pipe 25 is respectively communicated with the vacuum pump 24 and the loading cavity 111 and is positioned between the vacuum pump 24 and the loading cavity 111; the positive pressure regulating valve 26 is fixedly connected with the first air pipe 25 and is positioned on one side of the first air pipe 25; the second air pipe 27 is respectively communicated with the main air pipe 22 and the loading cavity 111 and is positioned between the main air pipe 22 and the loading cavity 111; the negative pressure regulating valve 28 is fixedly connected with the second air pipe 27 and is positioned on the side edge of the second air pipe 27; the first air pressure sensor 211 is fixedly connected with the casing 11 and is located at the side of the casing 11; the air system 2 further comprises a second air pressure sensor 210; the second air pressure sensor 210 is fixedly connected with the housing 11 and is located at a side of the housing 11; the air system 2 further comprises a third air pressure sensor 29; the third air pressure sensor 29 is fixedly connected with the housing 11 and is located at a side of the housing 11.
In this embodiment, the air source 21 provides air to the turbine 13 to meet the power requirement of the turbine 13, so that the turbine 13 and the rotor 18 rotate, the throttle valve 23 is used for adjusting the air intake amount and controlling the rotation speed of the rotor 18, and the vacuum pump 24, the first air pipe 25, the positive pressure regulating valve 26, the second air pipe 27 and the negative pressure regulating valve 28 cooperate with each other to adjust the air pressure in the loading cavity 111 and test the bearing capacity of the bearing 6 to be tested in different air pressure environments; the first air pressure sensor 211 is used for detecting the air pressure in the loading cavity 111; the second air pressure sensor 210 is used for detecting the air pressure at the inlet of the turbine 13; the third air pressure sensor 29 is used for detecting the air pressure at the outlet of the turbine 13.
Further, the air system 2 further comprises a first air filter 213; the first air filter 213 is fixedly connected to the main air pipe 22 and is located at one side of the main air pipe 22.
In the present embodiment, the first air filter 213 is used for filtering air entering the turbine 13.
Further, the air system 2 further comprises a second air filter 214; the second air filter 214 is fixedly connected with the second air pipe 27 and is positioned at one side of the second air pipe 27.
In the present embodiment, the second air filter 214 is used for filtering air entering into the loading chamber 111.
In a second aspect, the present invention further provides a method for testing dynamic characteristics of a radial aerodynamic bearing, including:
s1, fixedly connecting the measured main shaft to the rotor 18, sleeving the bearing 6 to be measured on the measured main shaft, and connecting the sensor module 19 with the bearing 6 to be measured;
selecting the specifications of the rotor 18, the radial bearing 16 and the axial bearing 17 according to the parameters of the bearing 6 to be tested such as the inner diameter, the width, the designed rotating speed, the designed highest rotating speed bearing capacity and the like, wherein the maximum rotating speed and the bearing capacity of a driving rotor system consisting of the rotor 18, the radial bearing 16 and the axial bearing 17 are 130% higher than the index of the bearing 6 to be tested in principle; when the bearing 6 to be tested is tested, the main shaft to be tested is fixedly connected to the rotor 18, the bearing 6 to be tested is sleeved on the main shaft to be tested, and then the sensor module 19 is connected with the bearing 6 to be tested.
S2, starting the lubricating oil system 3, and conveying the lubricating oil to the two radial bearings 16 and the axial bearing 17;
and starting the lubricating oil system 3, delivering lubricating oil to the two radial bearings 16 and the axial bearing 17, and lubricating the two radial bearings 16 and the axial bearing 17.
S3, starting the air system 2 to drive the turbine 13 and the rotor 18 to rotate, so that the rotor 18 reaches the rotation speed required to be measured, and the air pressure in the loading cavity reaches the required test pressure;
and starting the air system 2, wherein the air system 2 provides air meeting the power requirement of the turbine 13 for driving the turbine 13, so that the turbine 13 and the rotor 18 rotate to enable the rotor 18 to reach the required measured rotating speed, and the air system 2 can also adjust the atmospheric pressure in the loading cavity 111 to enable the measured bearing 6 to be under the required working environment pressure.
S4, starting the exciting device 110 to apply tension to the bearing 6 to be measured, gradually increasing the tension and recording the temperature, torque and axis locus of the bearing 6 to be measured when different tensions are applied, when the tension is increased to the extent that the bearing 6 to be measured cannot bear, the bearing 6 to be measured is in contact friction with the main shaft 5 to be measured, at the moment, the sensor module 19 detects that the temperature and torque of the bearing 6 to be measured suddenly jump and rise according to the proportion increased along with the increase of the tension when the bearing 6 to be measured does not normally run, and the tension recorded by the measurement and control system 4 at a critical point is the maximum bearing capacity of the bearing 6 to be measured at the rotating speed and under the environmental pressure;
the excitation device 110 is a device capable of exciting the bearing 6 to be tested, a tension cylinder or a vibration exciter can be adopted, the excitation device 110 is started to apply tension to the bearing 6 to be tested according to test requirements, the bearing temperature-loading tension and the bearing torque-loading tension are in a linear relation when the bearing normally operates, the bearing temperature-loading tension and the bearing torque-loading tension are gradually increased according to a fixed proportion along with the increase of the loading tension, the bearing 6 to be tested is in contact friction with the main shaft 5 to be tested when the bearing 6 to be tested cannot bear the tension, the temperature and the torque of the bearing 6 to be tested can be suddenly increased at the moment, the sensor module 19 is composed of a plurality of sensors, and when the sensor module 19 detects the increase of the temperature and the torque of the bearing 6 to be tested, the tension recorded by the measurement and control system 4 at a critical point is the maximum bearing capacity of the bearing 6 to be tested at the rotating speed.
S5, changing the air inflow of the air system 2 to adjust the rotating speed of the rotor 18, and then testing until the bearing capacity of the bearing 6 to be tested at the maximum rotating speed of the rotor 18 to be tested is measured;
and adjusting the rotating speed of the rotor 18 by changing the air inflow of the air system 2, and then testing until the bearing capacity of the bearing 6 to be tested at the maximum rotating speed of the rotor 18 to be tested under the environmental pressure is measured.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. A radial aerodynamic bearing dynamic characteristic testing device is characterized in that,
the system comprises a mechanical system, an air system, an oil system and a measurement and control system;
the mechanical system comprises a machine shell, a volute, a turbine, a nozzle ring, a bearing shell, two radial bearings, an axial bearing, a rotor, a sensor module and an excitation device; the housing has a loading chamber; the volute is fixedly connected with the shell and is positioned on the inner side of the shell; the turbine is rotationally connected with the volute and is positioned on the inner side of the volute; the nozzle ring is fixedly connected with the volute and is positioned in the volute; the bearing shell is fixedly connected with the shell and is positioned on the inner side of the shell; the two radial bearings are respectively and fixedly connected with the bearing shell and are respectively positioned on the inner side of the bearing shell; the axial bearing is fixedly connected with the bearing shell and is positioned on the inner side of the bearing shell; the rotor is fixedly connected with the turbine and penetrates through the two radial bearings and the axial bearing; the sensor module is fixedly connected with the shell and is positioned on the side edge of the shell; the excitation device is fixedly connected with the shell and is positioned on one side of the shell; the air system is communicated with the volute, the loading cavity and one side of the shell; the lubricating oil system is communicated with the bearing shell and is positioned on one side of the bearing shell; the measurement and control system is electrically connected with the sensor module and the excitation device respectively and is positioned on one side of the sensor module.
2. The device for testing the dynamic characteristics of a radial aerodynamic bearing according to claim 1, wherein,
the sensor module comprises a torque sensor, a temperature sensor, a rotating speed sensor and an axis track sensor; the torque sensor is fixedly connected with the shell, is electrically connected with the measurement and control system and is positioned on the side edge of the shell; the temperature sensor is fixedly connected with the shell, electrically connected with the measurement and control system and positioned on the side edge of the shell; the rotating speed sensor is fixedly connected with the shell, is electrically connected with the measurement and control system and is positioned on the side edge of the shell; the axle center track sensor is fixedly connected with the shell, is electrically connected with the measurement and control system and is positioned on the side edge of the shell.
3. The device for testing the dynamic characteristics of a radial aerodynamic bearing according to claim 1, wherein,
the air system comprises an air source, a main air pipe, a throttling regulating valve, a vacuum pump, a first air pipe, a positive pressure regulating valve, a second air pipe, a negative pressure regulating valve and a first air pressure sensor; the main air pipe is respectively communicated with the air source and the volute and is positioned between the air source and the volute; the throttling regulating valve is fixedly connected with the main air pipe and is positioned on one side of the main air pipe; the vacuum pump is positioned on one side of the gas source; the first air pipe is respectively communicated with the vacuum pump and the loading cavity and is positioned between the vacuum pump and the loading cavity; the positive pressure regulating valve is fixedly connected with the first air pipe and is positioned on one side of the first air pipe; the second air pipe is respectively communicated with the main air pipe and the loading cavity and is positioned between the main air pipe and the loading cavity; the negative pressure regulating valve is fixedly connected with the second air pipe and is positioned on the side edge of the second air pipe; the first air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
4. A radial aerodynamic bearing dynamic property testing apparatus according to claim 3,
the air system further comprises a second air pressure sensor; the second air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
5. A radial aerodynamic bearing dynamic property testing apparatus according to claim 3,
the air system further comprises a third air pressure sensor; the third air pressure sensor is fixedly connected with the shell and is positioned on the side edge of the shell.
6. A method for testing dynamic characteristics of a radial aerodynamic bearing, which is applied to the device for testing dynamic characteristics of a radial aerodynamic bearing according to claims 1 to 5, and which comprises:
fixedly connecting a measured main shaft to the rotor, sleeving a bearing to be measured on the measured main shaft, and connecting the sensor module with the bearing to be measured;
starting a lubricating oil system, and conveying lubricating oil to the two radial bearings and the axial bearing;
starting an air system to drive the turbine and the rotor to rotate, so that the rotor reaches the rotating speed required to be measured, and the air pressure in the loading cavity reaches the required test pressure;
starting an excitation device to apply tension to a bearing to be tested, gradually increasing the tension and recording the temperature, torque and axis locus of the bearing to be tested when different tensions are applied, when the tension is increased to the extent that the bearing to be tested cannot bear the tension, the bearing to be tested is in contact friction with a main shaft to be tested, at the moment, a sensor module can detect that the temperature and the torque of the bearing to be tested are suddenly increased in proportion increased along with the increase of the tension when the bearing to be tested does not normally run, and the tension recorded by a measurement and control system at a critical point is the maximum bearing capacity of the bearing to be tested under the rotating speed and the environmental pressure;
and changing the air inflow of the air system to adjust the rotating speed of the rotor, and then testing until the bearing capacity of the bearing to be tested at the maximum rotating speed of the rotor to be tested under the environmental pressure is tested.
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| CN202210300208.XA CN114674558A (en) | 2022-03-24 | 2022-03-24 | Device and method for testing dynamic characteristics of radial aerodynamic bearing |
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| CN202210300208.XA CN114674558A (en) | 2022-03-24 | 2022-03-24 | Device and method for testing dynamic characteristics of radial aerodynamic bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118168801A (en) * | 2024-05-15 | 2024-06-11 | 成都工业职业技术学院 | Bearing testing device for electric automobile driving motor |
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2022
- 2022-03-24 CN CN202210300208.XA patent/CN114674558A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118168801A (en) * | 2024-05-15 | 2024-06-11 | 成都工业职业技术学院 | Bearing testing device for electric automobile driving motor |
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