CN213148308U - Aeroengine bearing detector - Google Patents
Aeroengine bearing detector Download PDFInfo
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- CN213148308U CN213148308U CN202021659498.XU CN202021659498U CN213148308U CN 213148308 U CN213148308 U CN 213148308U CN 202021659498 U CN202021659498 U CN 202021659498U CN 213148308 U CN213148308 U CN 213148308U
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Abstract
The utility model provides an aeroengine bearing detector, wherein a microammeter dial plate for displaying current is arranged on a hand-held box, and a detection circuit module is arranged in the hand-held box; the detection circuit module comprises a power supply module, the power supply module is connected with a power supply conversion module, the power supply conversion module has two paths of output, one path of output is connected with a constant current source module, and the other path of output is connected with an active band-pass filter module; the constant current source module is connected with an accelerator sensor, and the accelerator sensor collects vibration signals and inputs the vibration signals to a low-noise preamplifier module, an active band-pass filter module, an output amplification conversion module and an earphone amplifier module of the host. When the bearing is damaged and corroded to cause faults or poor lubrication occurs, the effective value of the vibration signal is obviously increased, and the indication of the microampere meter correspondingly swings to a large extent after being amplified by the electronic amplification circuit.
Description
Technical Field
The utility model relates to an aeroengine bearing detects technical field, especially relates to aeroengine bearing detector.
Background
The existing detector can be used for detecting the gap of a part of main shaft bearings of the aircraft engine, but cannot be applied to the detection of the gap between shafts of bearings of the first-30K II, the second-30K Y-154 and modified bearings thereof of the aircraft engine.
SUMMERY OF THE UTILITY MODEL
For solving above technical problem, the utility model provides an aeroengine bearing detector, this detector adopts the low frequency method to vibrate sound fault diagnosis, through gathering the inside vibration intensity of low pressure turbine shaft, through the inside charge amplifier of acceleration sensor, transform into the alternating voltage signal along with the vibration intensity change, export the low noise preamplifier of handheld box, band pass filter, by the output enlarge transform circuit through microampere table instruction, the change of its instruction value change size depends on vibration sensor's vibration intensity's change, and then the current change through handheld box judges whether the bearing breaks down.
In order to realize the technical characteristics, the purpose of the utility model is realized as follows: the aeroengine bearing detector comprises a handheld box, wherein a microampere meter dial plate for displaying current is arranged on the handheld box, and a detection circuit module is arranged in the handheld box; the detection circuit module comprises a power supply module, the power supply module is connected with a power supply conversion module, the power supply conversion module has two paths of output, one path of output is connected with a constant current source module, and the other path of output is connected with an active band-pass filter module; the constant current source module is connected with an accelerator sensor, the accelerator sensor collects vibration signals and inputs the vibration signals to a low-noise preamplifier module, an active band-pass filter module, an output amplification conversion module and an earphone amplifier module of the host, and the earphone amplifier module is connected with an earphone interface; and the other two output ends of the output amplification conversion module are respectively connected with the LED overrun alarm module and the microammeter.
The power module adopts a DC5V lithium battery to provide power for the equipment.
One path of the power supply conversion module is converted by a DC/DC power supply module to obtain DC +/-9V for supplying power to the source band-pass filter module; and the other path is converted by a DC/DC power supply module to obtain DC24V which is transmitted to a constant current source module and then supplies power to an accelerator sensor with a built-in IC.
And the output end of the LED overrun alarm module is connected with the microammeter.
The power supply conversion module is connected with the power supply self-checking module, the power supply self-checking module is connected with the microampere meter, and the microampere meter is connected with the microampere meter dial.
The accelerator sensor adopts a single-shaft piezoelectric acceleration sensor, and the frequency range of the acceleration sensor is as follows: 0.7-10000 Hz; and when in detection, the accelerator sensor is closely attached to the surface of the engine bearing.
The upper surface of the handheld box is provided with a detector switch for controlling the power supply module, a self-checking switch for controlling the power supply self-checking module, an earphone interface for connecting an earphone, a sensor interface for connecting an acceleration sensor signal line, a volume adjusting knob for adjusting the volume of the earphone and an LED lamp for displaying an alarm signal of the LED overrun alarm module.
The utility model discloses there is following beneficial effect:
the vibration intensity in the low-pressure turbine shaft is acquired by the acceleration sensor of the detector, the vibration intensity is converted into an alternating voltage signal changing along with the vibration intensity through the charge amplifier in the acceleration sensor, the alternating voltage signal is output to the low-noise preamplifier module and the active band-pass filter module of the detector, the output amplification conversion module indicates the alternating voltage signal through the microampere meter, and the change of the indicating value depends on the change of the vibration intensity of the vibration sensor.
When the bearing is damaged and corroded, or poor lubrication occurs, the effective value of the vibration signal is obviously increased, and the indication of the microampere meter correspondingly swings to a large extent after being amplified by the electronic amplification circuit; meanwhile, the audio signal related to the fault can be obtained after the signal is processed.
Due to the fact that background noise is low, impact signals such as click sound caused by bearing or bearing seat local surface peeling, scratching, indentation or local corrosion are clear and audible, frequency is selected through a band-pass filter, a section of proper frequency range is selected, and the change of sound is monitored directly through a high-quality earphone, so that the fault can be accurately judged by the device.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a front view of the detector of the present invention.
Fig. 2 is a schematic diagram of the system of the present invention.
Fig. 3 is a schematic circuit diagram of the present invention.
Fig. 4 is a schematic diagram of the working process of the present invention.
In the figure: the device comprises a power supply module 1, a power supply conversion module 2, a power supply self-checking module 3, a constant current source module 4, an accelerator sensor 5, a low-noise preamplifier module 6, an active band-pass filter module 7, an output amplification conversion module 8, an earphone amplifier module 9, an earphone interface 10, a microammeter 11, an LED overrun alarm module 12, a handheld box 13, a microammeter dial 14, a volume adjusting knob 15, a detector switch 16, a self-checking switch 17, an LED lamp 18 and a sensor interface 19.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1-4, the aeroengine bearing detector comprises a handheld box 13, wherein a microampere meter dial 14 for displaying current is arranged on the handheld box 13, and a detection circuit module is arranged inside the handheld box 13; the detection circuit module comprises a power supply module 1, the power supply module 1 is connected with a power supply conversion module 2, the power supply conversion module 2 has two paths of output, one path is connected with a constant current source module 4, and the other path is connected with an active band-pass filter module 7; the constant current source module 4 is connected with an accelerator sensor 5, the accelerator sensor 5 collects vibration signals and inputs the vibration signals to a low-noise preamplifier module 6, an active band-pass filter module 7, an output amplification conversion module 8 and an earphone amplifier module 9 of the host, and the earphone amplifier module 9 is connected with an earphone interface 10; and the other two output ends of the output amplification conversion module 8 are respectively connected with the LED overrun alarm module 12 and the microammeter 11. Through adopting the detector of above-mentioned structure, it can be used for detecting whether aircraft engine main shaft bearing clearance is just producing, through turning into the current signal with vibration signal, and then realizes its fault diagnosis. The detection efficiency is improved, and the detection quality is ensured.
Further, the power module 1 supplies power to the device by using a DC5V lithium battery. The power module 1 can provide electric energy for the whole detector.
Furthermore, one path of the power conversion module 2 is converted by a DC/DC power module to obtain DC +/-9V for supplying power to the source band-pass filter module 7; the other path is converted by a DC/DC power supply module to obtain DC24V which is transmitted to a constant current source module 4 and then supplies power to an accelerator sensor 5 with a built-in IC. The power conversion module 2 can provide various different power supplies for the detector at the same time.
Further, the output end of the LED over-limit alarm module 12 is connected to the microammeter 11. The purpose of alarming can be achieved through the LED overrun alarming module 12. And then whether the fault exists can be rapidly judged.
Further, the power conversion module 2 is connected with the power self-checking module 3, the power self-checking module 3 is connected with the microampere meter 11, and the microampere meter 11 is connected with the microampere meter dial 14. The power self-checking module 3 is used for checking whether the microammeter 11 is normal or not.
Further, the accelerator sensor 5 is a single-axis piezoelectric acceleration sensor, and the frequency range thereof is as follows: 0.7-10000 Hz; during detection, the accelerator sensor 5 is brought into close contact with the engine bearing surface.
Further, the upper surface of the handheld box 13 is provided with a detector switch 16 for controlling the power module 1, a self-checking switch 17 for controlling the power self-checking module 3, an earphone interface 10 for connecting an earphone, a sensor interface 19 for connecting an acceleration sensor signal line, a volume adjusting knob 15 for adjusting the volume of the earphone, and an LED lamp 18 for displaying an alarm signal of the LED over-limit alarm module 12.
The design principle of the utility model is as follows:
the working principle of the detector is that a low-frequency method is adopted for vibration sound fault diagnosis. I.e. the frequency chosen depends on the engine shaft rotation frequency and the number of rolling bearings, mainly in the frequency range of tens of Hz to hundreds of Hz. The main advantages of utilizing the frequency band to carry out fault diagnosis are that the fault information is rich and the diagnosis scheme is easy to realize. The acceleration vibration sensor fixed at the front end of the detection rod acquires the vibration intensity in the low-pressure turbine shaft, the vibration intensity is converted into an alternating voltage signal changing along with the vibration intensity through a charge amplifier in the acceleration sensor, the alternating voltage signal is output to a low-noise preamplifier and a band-pass filter of the handheld box, the output amplification conversion circuit indicates the alternating voltage signal through a microampere meter, and the change of the indication value depends on the change of the vibration intensity of the vibration sensor. When the bearing is damaged and corroded, or poor lubrication occurs, the effective value of the vibration signal is obviously increased, and the indication of the microampere meter correspondingly swings to a large extent after being amplified by the electronic amplification circuit; meanwhile, the audio signal related to the fault can be obtained after the signal is processed. Due to the fact that background noise is low, impact signals such as click sound caused by bearing or bearing seat local surface peeling, scratching, indentation or local corrosion are clear and audible, frequency is selected through a band-pass filter, a section of proper frequency range is selected, and the change of sound is monitored directly through a high-quality earphone, so that the fault can be accurately judged by the device.
When the bearing clearance of the engine is detected, a detection rod with a sensor is sent into the turbine from a conical opening of the fairing, the sensor is enabled to be tightly attached to the surface of the bearing, the engine is shaken by a special tool ratchet wrench configured with the airplane, when the rotating speed reaches a certain value, the current of the detector is more than or equal to 40 microamperes, the engine is stopped being shaken, the ratchet wrench is rapidly withdrawn to naturally decelerate, and the microampere value is read at the moment. The current value of the normal engine is less than 20 microamperes, the current value of the fault engine is greater than 30 microamperes, the current value of 20 microamperes-30 microamperes is used as an engine monitoring item, namely, the engine needs to be detected every 25 hours of operation. Thus, the whole detection process is carried out when the engine runs at low speed, and the noise interference can be greatly reduced. Secondly, the installation position of the detection sensor is fixed, the sensor is sent to the front end of the turbine shaft close to the roller bearing between the shafts by a special rod-shaped device through a fairing cone, and the engine is manually rotated to detect. Thus, the influence of the change of the engine speed on the detection result can be effectively inhibited.
The utility model discloses a use as follows:
and connecting the tail signal wire of the assembled metal detection rod with a sensor interface 19 of the detector.
The 'on-off' of the detector is set at 'on' position, and the microampere ammeter of the detector tends to zero position after having a current indication swing, which should be less than 2 uA.
When the 'working-self-checking' switch is set to 'self-checking', the equipment indication is within the range of 90 uA-100 uA, which indicates that the detector is in a normal power supply state. If the indicated value becomes small or not, the equipment is required to be charged in time.
The detection rod with the acceleration sensor 5 is sent to the turbine from the conical opening of the fairing, the acceleration sensor 5 is enabled to be tightly attached to the surface of the bearing, the engine is rotated by utilizing a special tool ratchet wrench configured with the airplane, when the rotating speed reaches a certain value, the current of the detector is more than or equal to 40 microamperes, the engine is stopped to be rotated, the ratchet wrench is rapidly withdrawn to enable the engine to naturally decelerate, and at the moment, the microampere value is read. The current value of the normal engine is less than 20 microamperes, the current value of the fault engine is greater than 30 microamperes, the current value is 20 microamperes-30 microamperes and is used as an engine monitoring item, namely, the detection is carried out every 25 hours when the engine works.
The engine was tested at three points in the same manner. One detection point every 120 °.
Before measurement, the cooling time of the engine is not less than 6 hours, the cooling time is 2-4 hours under the subzero temperature condition, the engine is parked for more than 4 hours under the subzero temperature condition, and the state of the engine is changed into slow running within 3 minutes before measurement.
In order to effectively identify faults, the designed detector comprehensively utilizes the following diagnosis parameters:
1 effective value of frequency-selective vibration signal
When wear and corrosion failures occur in the bearing, or poor lubrication occurs, the effective value of the vibration signal may increase significantly in certain frequency bands. Therefore, an active band-pass filter in a proper frequency range is designed, and the root mean square value of the filtered signal is obtained, which is an effective method for obtaining the characteristic parameter of the bearing wear or corrosion fault. However, how to select the proper characteristic frequency is crucial to ensure high diagnostic sensitivity and high reliability of the diagnostic result, which is ultimately solved by the test. In addition, the limit values of the effective value of the frequency-selective vibration signal, including the allowable limit value and the final limit value, are also solved by experiments.
2-acoustic signal monitoring
The signal is processed to obtain audio signal related to fault, and an external earphone is used to help identify fault information. Because the background noise is low, impact signals caused by the peeling, scratching, indentation or local corrosion of the local surface of the bearing or the bearing seat are clear and audible, a proper frequency range is selected, and the high-fidelity binaural earphone is directly used for monitoring the change of sound, so that the high resolution of the instrument on faults can be ensured.
3 LED overrun alarm display circuit
Faults are identified based on how evenly the bearing is running during rocking and natural deceleration. When the surface of the bearing has faults of scratch, local surface peeling and the like, because a large pulse signal is generated in the uniform deceleration process, the voltage output to two ends of the light-emitting diode is increased after the processing of the amplifying circuit, so that the light-emitting diode LED is lightened, and the alarm display is realized; on the contrary, when the surface condition of the bearing is good, the voltage across the LED is small and the light emitting diode LED does not emit light. Accordingly, the presence or absence of the failure can be determined.
The schematic diagram of the detector circuit is shown in the figure. The DC5V lithium battery supplies power for equipment, one path of the lithium battery is converted by the DC/DC power supply module to obtain DC +/-9V for supplying power for the operational amplifier chip, and the other path of the lithium battery is converted by the DC/DC power supply module to obtain DC24V which is transmitted to the constant current source module and then supplies power for the single-shaft piezoelectric acceleration sensor with the built-in IC. The acceleration sensor collects the vibration intensity in the low-pressure turbine shaft of the engine and outputs an alternating voltage signal which changes along with the vibration intensity, the alternating voltage signal is output to a low-noise preamplifier and a band-pass filter in the host, the alternating voltage signal is indicated by an output amplification conversion circuit through a microampere meter, and the change of the indication value depends on the change of the vibration intensity of the vibration sensor. When the bearing has abrasion and corrosion failure or poor lubrication, the effective value of the vibration signal is obviously increased, and the indication of the microampere meter correspondingly swings to a large extent.
Claims (7)
1. Aeroengine bearing detector, its characterized in that: the current display device comprises a handheld box (13), wherein a microammeter dial (14) for displaying current is arranged on the handheld box (13), and a detection circuit module is arranged in the handheld box (13); the detection circuit module comprises a power supply module (1), the power supply module (1) is connected with a power supply conversion module (2), the power supply conversion module (2) has two paths of output, one path is connected with a constant current source module (4), and the other path is connected with an active band-pass filter module (7); the constant current source module (4) is connected with an accelerator sensor (5), the accelerator sensor (5) collects vibration signals and inputs the vibration signals to a low-noise preamplifier module (6), an active band-pass filter module (7), an output amplification conversion module (8) and an earphone amplifier module (9) of the host, and the earphone amplifier module (9) is connected with an earphone interface (10); the other two output ends of the output amplification conversion module (8) are respectively connected with the LED overrun alarm module (12) and the microammeter (11).
2. The aircraft engine bearing detector of claim 1, wherein: the power module (1) adopts a DC5V lithium battery to provide power for equipment.
3. The aircraft engine bearing detector of claim 1, wherein: one path of the power supply conversion module (2) is converted by a DC/DC power supply module to obtain DC +/-9V which is used for supplying power to the source band-pass filter module (7); and the other path is converted by a DC/DC power supply module to obtain DC24V which is transmitted to a constant current source module (4) and then supplies power to an accelerator sensor (5) of the built-in IC.
4. The aircraft engine bearing detector of claim 1, wherein: the output end of the LED overrun alarm module (12) is connected with the microammeter (11).
5. The aircraft engine bearing detector of claim 1, wherein: the power supply conversion module (2) is connected with the power supply self-checking module (3), the power supply self-checking module (3) is connected with the microampere meter (11), and the microampere meter (11) is connected with a microampere meter dial (14).
6. The aircraft engine bearing detector of claim 1 or 3, wherein: the accelerator sensor (5) adopts a single-shaft piezoelectric acceleration sensor, and the frequency range is as follows: 0.7-10000 Hz; when detecting, the accelerator sensor (5) is closely attached to the engine bearing surface.
7. The aircraft engine bearing detector of claim 1, wherein: the upper surface of handheld box (13) is provided with detector switch (16) that is used for controlling power module (1), self-checking switch (17) that is used for controlling power self-checking module (3), earphone interface (10) that are used for connecting the earphone, sensor interface (19) that are used for connecting the acceleration sensor signal line, volume adjust knob (15) that are used for adjusting the earphone volume and LED lamp (18) that are used for showing LED alarm module (12) alarm signal that transfinites.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021659498.XU CN213148308U (en) | 2020-08-11 | 2020-08-11 | Aeroengine bearing detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021659498.XU CN213148308U (en) | 2020-08-11 | 2020-08-11 | Aeroengine bearing detector |
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| CN213148308U true CN213148308U (en) | 2021-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234820A (en) * | 2022-09-21 | 2022-10-25 | 浙江百能科技有限公司 | Method for filling lubricating grease of rolling bearing under sound wave auxiliary control |
-
2020
- 2020-08-11 CN CN202021659498.XU patent/CN213148308U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234820A (en) * | 2022-09-21 | 2022-10-25 | 浙江百能科技有限公司 | Method for filling lubricating grease of rolling bearing under sound wave auxiliary control |
| CN115234820B (en) * | 2022-09-21 | 2022-12-13 | 浙江百能科技有限公司 | Method for filling lubricating grease of rolling bearing under auxiliary control of sound waves |
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