A test system and method for simulating the wear of bearings of high-speed rotating equipment

Abstract

The present invention discloses a test system and method for simulating bearing wear of a high-speed rotating device. The system includes: a workbench frame, a vacuum system, a console, a cooling water system, a monitoring system, and a power supply system; the workbench frame is used to place the high-speed rotating device; the vacuum system is used to evacuate the test environment of the system; the console is used to record and monitor the operation of the experiment and remotely control the device; the cooling water system is used to reduce the temperature of the high-speed rotating device during the speed-up process; the monitoring system is used to complete the monitoring of the vibration amplitude, rotational speed, abnormal sound, axial clearance, system pressure, water temperature, back electromotive force, and electrical parameters of the high-speed rotating device; the power supply system is used to provide an intermediate-frequency power supply of 50 to 2000 Hz for the system and output the power required for the operation of the system; based on the vibration amplitude, axial clearance change, back electromotive force change, and friction power consumption, the bearing wear condition of the high-speed rotating device can be determined.

Description

Technical Field

[0001] The present invention relates to the technical field of fault simulation tests, and particularly to a test system and method for simulating bearing wear of high-speed rotating equipment. Background Art

[0002] The bearing wear test of high-speed rotating equipment is a test method for inspecting bearing wear. By monitoring parameters such as the vibration amplitude, axial clearance change, back electromotive force change, friction power consumption, and pull-in synchronization power during the test process and at the rated speed, it is possible to judge the impact of abnormal bearing wear of high-speed rotating equipment on the operating machine.

[0003] The bearing of high-speed rotating equipment has two functions: 1) a supporting function. The bearing system supports the rotating components of the special equipment, enabling it to rotate at high speed and bearing a part of the rotor weight and the axial magnetic pull of the motor. 2) Transmitting vibration. The rotor is connected to the support through the bearing system, and the vibration is transmitted to the support through the bearing system, enabling the support to attenuate the vibration of the rotor. Since high-speed rotating equipment requires high-speed and long-life operation and cannot be repaired during factory operation, the requirements for the bearings of high-speed rotating equipment are very high. Therefore, monitoring the bearing wear of the machine through a simulated bearing wear test plays an important role in assessing the machine life.

[0004] There are many existing technologies for monitoring bearing wear. Among them, measuring the wear of gas bearings is a method of measuring the vibration of the rotor by measuring the gas film existing between the bearing and the rotor and using the gas film support effect. It is difficult to effectively judge the wear of the bearing itself and can only judge the rotor stability. Summary of the Invention

[0005] The purpose of the present invention is to provide a test system and method for simulating bearing wear of high-speed rotating equipment to address the technical deficiencies in the existing technology.

[0006] The technical solution adopted to achieve the purpose of the present invention is as follows:

[0007] A test system for simulating bearing wear of high-speed rotating equipment, the system includes: a workbench frame, a vacuum system, a console, a cooling water system, a monitoring system, and a power supply system, wherein:

[0008] The workbench frame is used to place high-speed rotating equipment;

[0009] The vacuum system includes a vacuum pump unit and a cold trap. The vacuum pump unit is used to evacuate the test environment of the system, and the cold trap is used to condense the water vapor and impurities extracted from it to prevent the oil vapor of the vacuum pump unit from diffusing back into the workbench frame;

[0010] The console is used to record and monitor the operation of the experiment and remotely control the equipment;

[0011] The cooling water system is used to reduce the temperature of the high-speed rotating equipment during the speed-up process;

[0012] The monitoring system consists of sensors required for measuring parameters, a field control cabinet and a computer, and is used to monitor the vibration amplitude, rotational speed, abnormal sound, axial clearance, system pressure, water temperature, back electromotive force and electrical parameters of the high-speed rotating equipment;

[0013] The power supply system is used to provide an intermediate frequency power supply of 50 - 2000 Hz for the system and output the power required for the system operation.

[0014] In the above technical solution, the power supply system is also used to absorb resistance to prevent the power supply voltage from being unstable caused by the back electromotive force.

[0015] In the above technical solution, the ultimate vacuum pumping pressure of the vacuum pump unit is not less than 0.01 Pa.

[0016] In the above technical solution, the cooling water inlet temperature of the cooling water system is controlled between 11°C and 15°C, and under the condition of ensuring that the high-speed rotating equipment does not condense, the cooling water inlet temperature of the cooling water system is controlled between 8°C and 11°C.

[0017] In the above technical solution, the pressure at the cooling water inlet is not higher than 0.49 MPa.

[0018] In the above technical solution, the total flow rate of each cooling water inlet is not less than 200 L / h.

[0019] A test method for simulating bearing wear of high-speed rotating equipment, the method includes:

[0020] Step 1: Place multiple high-speed rotating equipment of different models to be tested on the workbench frame, conduct trial runs on the high-speed rotating equipment to be tested, exclude the high-speed rotating equipment with abnormal conditions, and make the pressure of the test system less than 2 Pa through the vacuum system;

[0021] Step 2: Turn on the power supply switch of the power supply system, adjust the intermediate frequency power supply to 50 Hz and the voltage to 36 V, and start the high-speed rotating equipment on the workbench frame;

[0022] Step 3: When the rotational speeds of all the high-speed rotating equipment have risen to 50 s -1 later, introduce cooling water and adjust the intermediate frequency power supply to 517 Hz and the voltage to (190 ± 10) V;

[0023] Step 4: When the rotational speed of the high-speed rotating equipment with the slowest speed-up has risen to 400 s-1 Afterwards, the power supply system adjusts the rotational speed of the high-speed rotating equipment to the rated speed and the voltage to (380±10)V.

[0024] Step 5, when the number of high-speed rotating equipment with a rotational speed rising above 700s -1 is greater than half of the total number of high-speed rotating equipment, reduce the vacuum degree of the high-speed rotating equipment.

[0025] Step 6, analyze and process the signals of the speed measurement coil set at the upper end of the high-speed rotating equipment through the console and the monitoring system, and monitor the vibration amplitude, axial clearance, and back electromotive force of the equipment during the speed increase process.

[0026] Step 7, when the rotational speed of all high-speed rotating equipment rises to the rated speed, absorb resistance through the power supply system.

[0027] Step 8, when the voltage of the equipment reaches 380V, press the "Demagnetization" button on the power supply system and measure the friction power consumption of the equipment.

[0028] Step 9, turn off the power supply switch on the console. When the rotational speed of the high-speed rotating equipment with the slowest speed reduction drops to 1545s -1 , lift the "Demagnetization" key of the power supply system and turn on the power supply switch on the console to supply power to the equipment, and measure the speed increase power.

[0029] Step 10, adjust the voltage to 361V, and measure the friction power consumption and speed increase power of the equipment at this voltage according to Steps 8 - 9.

[0030] Step 11, when the rotational speed of all the equipment rises to the rated speed, adjust the equipment to the overspeed operation state through the power supply system, and all high-speed rotating equipment operates stably at the overspeed operation state for 2h.

[0031] Step 12, after the overspeed operation of the equipment ends, its rotational speed drops to the rated speed. Measure the vibration amplitude, axial clearance, back electromotive force, friction power consumption, and speed increase power of the high-speed rotating equipment at this rotational speed.

[0032] Step 13, turn off the high-speed rotating equipment on the workbench.

[0033] Step 14, based on the vibration amplitude change, axial clearance change, and back electromotive force obtained in Steps 1 - 13, infer the upper clearance value and lower clearance change situation of the high-speed rotating equipment, and determine the performance indicators of the bearings of each high-speed rotating equipment according to the friction power consumption measured at the rated speed.

[0034] In the above technical solution, the rotational speed for the trial rotation of the high-speed rotating equipment to be tested in Step 1 is 20s -1 .

[0035] In the above technical solution, in step 8, when the "demagnetization" button on the power supply system is pressed, the voltage on the power supply gradually returns to zero.

[0036] In the above technical solution, in step 11, during the constant speed operation in the overspeed operation state, the amplitude increase within 2 hours is less than 10 μm.

[0037] In the above technical solution, in step 13, turning off the high-speed rotating equipment on the workbench includes: forcing the high-speed rotating equipment to decelerate by turning off the power supply switch of the power supply system.

[0038] In the above technical solution, forcing the high-speed rotating equipment to decelerate by turning off the power supply switch of the power supply system includes: adjusting the intermediate frequency power supply to 50 Hz, the rotational speed to "-5 s" -1 ", and automatically adjusting the voltage according to the built-in voltage-frequency curve to force the high-speed rotating equipment to decelerate.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] Based on the test system and method for simulating the bearing wear of a high-speed rotating equipment of the present invention, it is possible to monitor the vibration amplitude, axial clearance change, back electromotive force change, and friction power consumption of the high-speed rotating equipment during the test process and at the rated rotational speed. According to the axial clearance change and back electromotive force change, it is possible to infer the upper clearance value and lower clearance change of the high-speed rotating equipment; according to the friction power consumption measured at the rated rotational speed, it is possible to determine the performance index of the bearing of the high-speed rotating equipment, and thus determine the wear condition of the bearing of the high-speed rotating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The structure schematic diagram of the test system for simulating the bearing wear of the high-speed rotating equipment of the present invention is shown.

[0042] In the figure: 1 workbench, 2 vacuum system, 3 console, 4 cooling water system, 5 monitoring system, 6 power supply system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following further describes the present invention in detail with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] Embodiment 1

[0045] A test system for simulating the bearing wear of a high-speed rotating equipment, the system includes: a workbench 1, a vacuum system 2, a console 3, a cooling water system 4, a monitoring system 5, and a power supply system 6, wherein:

[0046] The workbench 1 is used to place high-speed rotating equipment;

[0047] The vacuum system 2 includes a vacuum pump unit and a cold trap. The ultimate vacuum pumping pressure of the vacuum pump unit is not lower than 0.01 Pa. The cold trap is used to condense the water vapor and impurities extracted from it to prevent the oil vapor of the vacuum pump unit from diffusing back into the workbench 1.

[0048] The control console 3 is used to record and monitor the operation of the experiment and remotely control the equipment.

[0049] The cooling water system 4 is used to reduce the temperature of the high-speed rotating equipment during the speed-up process; among them, the inlet temperature of the cooling water of the cooling water system 4 is controlled between 11°C and 15°C; under the condition of ensuring that the high-speed rotating equipment does not dew, the inlet temperature of the cooling water of the cooling water system is controlled between 8°C and 11°C; the pressure at the cooling water inlet is not higher than 0.49 MPa, and the total flow rate of each cooling water inlet is not less than 200 L / h.

[0050] The monitoring system 5 is composed of sensors required for measuring parameters, a field control cabinet and a computer, and is used to complete the monitoring of the vibration amplitude, rotation speed, abnormal sound, axial clearance, system pressure, water temperature, back electromotive force and electrical parameters of the high-speed rotating equipment.

[0051] The power supply system 6 is used to provide an intermediate frequency power supply of 50 - 2000 Hz for the system and output the power required for the system operation; the power supply system 6 is also used to absorb resistance to prevent the power supply voltage from being unstable caused by the back electromotive force.

[0052] Embodiment 2

[0053] On the basis of Embodiment 1, a test method for simulating the bearing wear of high-speed rotating equipment, the method includes:

[0054] Step 1, place multiple high-speed rotating equipment of different models to be tested on the workbench 1, perform trial rotation on the high-speed rotating equipment to be tested, exclude the high-speed rotating equipment with abnormal conditions, and make the pressure of the test system less than 2 Pa through the vacuum system 2;

[0055] Step 2, turn on the power supply switch of the power supply system 6, adjust the intermediate frequency power supply to 50 Hz and the voltage to 36 V, and start the high-speed rotating equipment on the workbench 1;

[0056] Step 3, when the rotation speeds of all the high-speed rotating equipment have risen to 50 s -1 later, introduce cooling water and adjust the intermediate frequency power supply to 517 Hz and the voltage to (190 ± 10) V;

[0057] Step 4, when the rotational speed of the high-speed rotating device with the slowest speed increase rises to 400 s -1 after that, adjust the rotational speed of the high-speed rotating device to the rated speed and the voltage to (380 ± 10) V through the power supply system 6;

[0058] Step 5, when the number of high-speed rotating devices with a rotational speed rising to 700 s -1 and above is greater than half of the total number of high-speed rotating devices, reduce the vacuum degree of the high-speed rotating devices;

[0059] Step 6, analyze and process the signals of the speed measuring coils arranged at the upper end of the high-speed rotating device through the console 3 and the monitoring system 5, and monitor the vibration amplitude, axial clearance, and back electromotive force of the device during the speed increase process;

[0060] Step 7, when the rotational speeds of all high-speed rotating devices rise to the rated speed, absorb the resistance through the power supply system 6;

[0061] Step 8, after the voltage of the device reaches 380 V, press the "demagnetization" button on the power supply system 6 and measure the friction power consumption of the device;

[0062] Step 9, turn off the power supply switch on the console 3. When the rotational speed of the high-speed rotating device with the slowest speed decrease drops to 1545 s -1 at that time, lift the "demagnetization" key of the power supply system 6 and turn on the power supply switch on the console to supply power to the device and measure the speed increase power;

[0063] Step 10, adjust the voltage to 361 V, and measure the friction power consumption and speed increase power of the device at this voltage according to Steps 8 - 9;

[0064] Step 11, when the rotational speeds of all the devices rise to the rated speed, adjust the devices to the overspeed operation state through the power supply system 6, and all high-speed rotating devices operate stably at the overspeed operation state for 2 h;

[0065] Step 12, after the overspeed operation of the device ends, its rotational speed drops to the rated speed. Measure the vibration amplitude, axial clearance, back electromotive force, friction power consumption, and speed increase power of the high-speed rotating device at this rotational speed;

[0066] Step 13, turn off the high-speed rotating device on the workbench 1;

[0067] Step 14, based on the vibration amplitude change, axial clearance change, and back electromotive force obtained in Steps 1 - 13, infer the upper clearance value and lower clearance change situation of the high-speed rotating device, and determine the performance indicators of the bearings of each high-speed rotating device according to the friction power consumption measured at the rated speed.

[0068] Further, the rotation speed for the trial rotation of the high-speed rotating device to be tested in Step 1 is 20 s -1 .

[0069] Further, in Step 8, press the "Demagnetization" button on the power supply system 6, and the voltage on the power supply gradually returns to zero.

[0070] Further, in Step 11, during the constant-speed operation in the overspeed operation state, the amplitude increase within 2 h is less than 10 μm.

[0071] Further, turning off the high-speed rotating device on the workbench 1 in Step 13 includes: forcing the high-speed rotating device to decelerate by turning off the power supply switch of the power supply system 6.

[0072] Further, forcing the high-speed rotating device to decelerate by turning off the power supply switch of the power supply system 6 includes: adjusting the intermediate-frequency power supply to 50 Hz and the rotation speed to "-5 s -1 ", and automatically adjusting the voltage according to the built-in voltage-frequency curve to force the high-speed rotating device to decelerate.

[0073] Among them, when the bearing of the high-speed rotating device is worn short, its size will change, resulting in a change in the bearing stiffness; at the same time, the shortening of the bearing makes the lower clearance under the rotor smaller and the upper clearance larger, causing a change in the axial bearing capacity. Therefore, the wear condition of the bearing of the high-speed rotating device can be determined by the upper clearance value and the change of the lower clearance.

[0074] The above is an exemplary description of the present invention. It should be noted that without departing from the core of the present invention, any simple deformation, modification, or equivalent replacement that can be made by those skilled in the art without creative labor falls within the protection scope of the present invention.

Claims

1. A testing method for a testing system that simulates the bearing wear of a high-speed rotating device, the system comprising: A workbench, a vacuum system, a console, a cooling water system, a monitoring system and a power supply system, where: The workbench is used to place high-speed rotating equipment; The vacuum system includes a vacuum pump unit and a cold trap. The vacuum pump unit is used to evacuate the test environment of the system, and the cold trap is used to condense the water vapor and impurities extracted from the system to prevent the oil vapor of the vacuum pump unit from diffusing back into the workbench; The console is used to record and monitor the operation of the experiment and remotely control the equipment; The cooling water system is used to reduce the temperature of the high-speed rotating equipment during the speed-up process; The monitoring system consists of sensors required for measuring parameters, a field control cabinet and a computer, and is used to complete the monitoring of the vibration amplitude, rotational speed, abnormal sound, axial clearance, system pressure, water temperature, back electromotive force and electrical parameters of the high-speed rotating equipment; The power supply system is used to provide an intermediate-frequency power supply of 50~2000Hz for the system and output the power required for the system operation; A test method, including the following steps: Step 1, Place multiple high-speed rotating equipment of different models to be tested on the workbench, perform a trial rotation on the high-speed rotating equipment to be tested, exclude the high-speed rotating equipment with abnormal conditions, and make the pressure of the test system less than 2 Pa through the vacuum system; Step 2, Turn on the power supply switch of the power supply system, adjust the intermediate-frequency power supply to 50Hz and the voltage to 36V, and start the high-speed rotating equipment on the workbench; Step 3, when the rotational speeds of all high-speed rotating devices have all increased to 50 s -1 after that, cool water is introduced, and the intermediate frequency power supply is adjusted to 517 Hz and the voltage is adjusted to (190 ± 10) V; Step 4, when the rotational speed of the high-speed rotating device with the slowest speed increase rises to 400 s -1 After that, adjust the rotational speed of the high-speed rotating device to the rated speed and the voltage to (380 ± 10) V through the power supply system; Step 5, when the number of high-speed rotating devices with a rotational speed rising to 700 s -1 and above is greater than half of the total number of high-speed rotating devices, reduce the vacuum degree of the high-speed rotating devices; Step 6, Analyze and process the signals of the speed measurement coil arranged at the upper end of the high-speed rotating equipment through the console and the monitoring system, and monitor the vibration amplitude, axial clearance and back electromotive force of the equipment during the speed-up process; Step 7, When the rotational speeds of all the high-speed rotating equipment rise to the rated rotational speed, absorb the resistance through the power supply system; Step 8, After the voltage of the equipment reaches 380V, press the "demagnetization" button on the power supply system and measure the friction power consumption of the equipment; Step 9, turn off the power switch on the console. When the rotational speed of the high-speed rotating device with the slowest speed reduction drops to 1545 s -1 , lift the "demagnetization" button of the power system and turn on the power switch on the console to supply power to the device, and measure the speed-up power; Step 10, Adjust the voltage to 361V, and measure the friction power consumption and speed-up power of the equipment at this voltage according to steps 8-9; Step 11, When the rotational speeds of all the equipment rise to the rated rotational speed, adjust the equipment to the overspeed operation state through the power supply system, and all the high-speed rotating equipment runs stably at the overspeed operation state for 2h; Step 12, After the overspeed operation of the equipment ends, its rotational speed drops to the rated rotational speed, and at this rotational speed, measure the vibration amplitude, axial clearance, back electromotive force, friction power consumption and speed-up power of the high-speed rotating equipment; Step 13, Turn off the high-speed rotating equipment on the workbench; Step 14, Based on the vibration amplitude change, axial clearance change and back electromotive force obtained in steps 1-13, infer the upper clearance value and lower clearance change of the high-speed rotating equipment, and determine the performance index of the bearing of each high-speed rotating equipment according to the friction power consumption measured at the rated rotational speed.

2. The test method according to claim 1, characterized in that, The power supply system is also used to absorb the resistance to prevent the power supply voltage from being unstable caused by the back electromotive force.

3. The test method according to claim 1, wherein The ultimate vacuum pressure of the vacuum pump unit is not less than 0.01 Pa.

4. The test method according to claim 1, wherein The cooling water inlet temperature of the said cooling water system is controlled between 11°C and 15°C. Under the condition of ensuring that the high-speed rotating equipment does not dew, the cooling water inlet temperature of the said cooling water system is controlled between 8°C and 11°C.

5. The test method according to claim 1, characterized in that, The pressure at the cooling water inlet of the said cooling water system is not higher than 0.49 MPa.

6. The test method according to claim 1, characterized in that The total flow rate of each cooling water inlet is not less than 200 L / h.

7. The test method according to claim 1, wherein The rotational speed for the trial rotation of the high-speed rotating device to be tested in the said step 1 is 20 s -1 .

8. The test method according to claim 1, wherein In the said step 8, when the "demagnetization" button on the power supply system is pressed, the voltage on the power supply gradually returns to zero.

9. The test method according to claim 1, wherein In the said step 11, during the steady-speed operation in the overspeed operation state, the amplitude increase within 2 h is less than 10 μm.

10. The test method according to claim 1, characterized in that, In the said step 13, shutting down the high-speed rotating equipment on the workbench includes: forcing the high-speed rotating equipment to decelerate by shutting off the power supply switch of the power supply system.

11. The test method according to claim 10, characterized in that, Forcing the high-speed rotating device to decelerate by turning off the power supply switch of the power system includes: adjusting the intermediate frequency power supply to 50 Hz and the rotational speed to "-5 s -1 ", automatically adjusting the voltage according to the built-in voltage-frequency curve, and forcing the high-speed rotating device to decelerate.

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