CN102967462A - Dynamic monitoring system for operating condition of thrust bearing of hydro-generator - Google Patents

Abstract

The invention discloses a dynamic monitoring system for an operating condition of a thrust bearing of a hydro-generator. The system comprises a temperature sensor, a pressure sensor, an oil film thickness sensor, a host machine and a remote computer, wherein the sensor is arranged on a mirror plate of the thrust bearing for outputting lubricating parameter data such as oil film thickness, oil film pressure, oil film temperature and the like with the rotation of the mirror plate; and the data can be used for reflecting the operating condition of the thrust bearing. Data is exchanged between the remote computer and the system host machine by using wi-fi wireless communication; the host machine is used for carrying out high-speed acquisition under the control of programs; the acquired data is uploaded to the computer by the wi-fi network for displaying, storing and analyzing in the remote computer; if the thickness of the oil film of a thrust pad is excessively small or the temperature increase is excessively quick, alarm prompting is carried out to avoid a pad burning accident, thereby ensuring the safe operation of the thrust bearing of the hydro-generator. The data can be used for optimizing the design of the thrust bearing of the hydro-generator, and can be used as the original data of the expert thrust bearing analysis system.

Description

Hydraulic generator thrust bearing running status dynamic monitoring system

Technical field

The present invention relates to a kind ofly dynamically supervise system for the hydraulic generator thrust bearing running status.

Background technology

The thrust bearing hydrogenerator " heart " of being known as, it is bearing electric generating set rotor weight and axial hydraulic thrust, and whether its serviceability and running status are directly connected to the operation of unit safe and reliable.Continuous increase along with the hydraulic generator unit capacity, requirement to large-scale unit operational reliability is also more and more higher, requirement to the thrust bearing safe and reliable operation is also more and more higher, and therefore the running status of monitoring thrust bearing just seems very important in the hydrogenerator operational process.

At present, the monitoring method of hydraulic generator set thrust bearing running status is mounting temperature sensor on thrust bearing shoe valve, temperature by the monitoring thrust bearing shoe valve determines whether the running status of thrust bearing is good, but this method existent defect, the first, the method can only reflect thrust bearing oil film state indirectly; The second, there is hysteresis phenomenon in temperature monitoring, the damage of bearing may occur when finding temperature anomaly, and can't make in advance caution.

Summary of the invention

The objective of the invention is to disclose a kind of dynamic monitoring system that is applied to the hydraulic generator thrust bearing running status, this system can be when the hydraulic generator unit moves carries out kinetic measurement to data such as the oil film thickness of every thrust bearing shoe, oil film pressure, oil film temperature, monitors the running status of thrust bearing by the lubrication parameter of monitoring thrust bearing.Technical scheme of the present invention is: a kind of hydraulic generator thrust bearing running status dynamic monitoring system, comprise temperature sensor, pressure transducer, the oil film thickness sensor, main frame, remote computer, main frame comprises PCM-3363CPU module U1, PCM-3910 power module U2, PCM-3835 memory module U3, the multi-functional acquisition module U4 of PCM-3718H, signal condition module U5, wi-fi wireless routing module U6, U1 wherein, U2, U3, U4 adopts the PC104 bus module, band is useful on contact pin and the jack that bus connects on the module, U1, U2, U3, U4 stacks gradually with jack by these contact pins and connects together, form nesting structural embedded control, U5 links to each other with signaling interface on the U4 by signal connecting line, U6 is connected to the network port of U1 by netting twine, oil film thickness sensor S11, S12, S13, S14, pressure transducer S21, S22, S23, the output signal of S24 enters data collecting card U4, temperature sensor S31, S32, S33, form signal D31 behind the output signal process signal condition module U5 of S34, D32, D33, D34 also enters data acquisition capture card U4, system host is lubricated the supplemental characteristic collection, when hydraulic generator thrust bearing running status dynamic monitoring system main frame begins data acquisition, at first record current time T1, remote computer is obtained speed revolution value n and this numerical value is sent to system host from the unit speed probe simultaneously, system host during according to the sampling interval of rotating speed computational data capture card between ⊿ T, set the every rotation one circle system host of unit and can collect 600 groups of measurement data, then

$\mathrm{\ΔT}=\frac{1}{\frac{n}{60}\×600}=\frac{1}{10n}$

$\left(1\right)$

Setting the triggered time that next time gathers according to formula (1) is T1+ ⊿ T, this time is carried out data acquisition after arriving again, go round and begin again according to this and carry out, each data acquisition uploads to remote computer with measurement data by wireless communication module U6 after finishing, remote computer receive the laggard line number of data according to one's analysis, show, preserve.

All sensors of the present invention all is installed on the runner plate, and every kind of sensor is respectively along different radial distribution, and the arrangenent diagram of sensor on runner plate as shown in Figure 2.Runner plate rotates a week, and three kinds of sensors can be distinguished inswept every thrust bearing shoe valve, and the device main frame gathers the measurement data of every sensor simultaneously under the control of working procedure, thereby obtains the lubrication parameter data on the every thrust bearing shoe valve.Because the main frame of hydraulic generator thrust bearing running status dynamic monitoring system carries out high-speed data acquisition under the control of working procedure, so runner plate whenever rotates a circle, each sensor can both collect tens groups of data at every thrust bearing shoe valve, can accurately show the thrust bearing running status.

Hydraulic generator thrust bearing running status dynamic monitoring system main frame, employing is ground the embedded board computer of PC104 bus of magnificent company as the basis, U1 among the present invention, U2, U3, U4 all adopt the PC104 bus module, being useful on bus on each module connects and contact pin and the jack expanded, 4 modules form nesting structural embedded control, have the advantages such as volume is little, resistance to shock is good, guaranteed the reliability service of system host under the state of running up.

The principle of signal condition module U5 use nonequilibrium bridge converts temperature signal S31, S32, S33, the S34 of three-wire system platinum resistance to satisfy the U4 acquisition range voltage signal D31, D32, D33, D34, these signals and oil film thickness signal S11, S12, S13, S14, oil film pressure signal S21, S22, S23, S24 receive on the 25 pin D type sockets of U4 together, and are bolted fixing.

Remote computer is common technical grade computing machine, adopts windows operating system, and the Lubricating Parameter of Thrust Bearing for Hydrogenerator data analysis software is installed, and is equipped with the wireless network card with wi-fi function.Use the LAN (Local Area Network) of 802.11 standard agreements to be called wi-fi(wireless-fidelity, the meaning is " Wireless Fidelity "), along with the development of wi-fi technology, WLAN (wireless local area network) more and more is used to industrial measurement and control.DATA REASONING on rotary part all will be used slip ring transmission measurement signal in the past, the system host random groups is rotated and is carried out dynamic acquisition among the present invention, carry out data transmission by the wi-fi WLAN (wireless local area network), save slip ring, solved slip ring transmission measurement signal and brought the problem of interference.Data processor in the remote computer is with data analysis, demonstration and the preservation of receiving; in case the phenomenon such as occur that the thrust bearing shoe valve oil film thickness is excessively thin, oil film pressure is unusual or the temperature raising speed is too fast; the remote computation chance provides alerting signal; remind operating personnel to process, guarantee the security of operation of thrust bearing.

What adopt among the present invention is directly three kinds of parameters of oil film thickness, oil film pressure, oil film temperature of thrust bearing to be monitored simultaneously, and random groups is rotated and is carried out data acquisition at a high speed, the running status of dynamic monitoring hydraulic generator thrust bearing, in case abnormal occurrence occurs, system can provide alerting signal, remind operating personnel to process, prevent trouble before it happens.In fact form safe oil film between the safe and reliable operation of thrust bearing dependence thrust bearing shoe valve and runner plate and realize that oil film thickness and oil film pressure can directly reflect the running status of thrust bearing.

The present invention be exactly by dynamically directly the lubrication parameters such as oil film thickness, oil film pressure and oil film temperature during every thrust bearing shoe valve operation of monitoring monitor the running status of thrust bearing.Calculate the time interval of sampling according to the velocity gauge of unit, guarantee that the every rotation one all monitoring systems of unit can collect 600 groups of data, when the thrust bearing operation is broken down, what at first change is exactly oil film pressure and oil film thickness, therefore these data ratio monitoring thrust bearing shoe valve temperature of dynamic monitoring more can directly be reacted the running status of thrust bearing, the more fault of the discovery thrust bearing of morning.

Description of drawings

Fig. 1 is invention main frame theory diagram

Fig. 2 is oil film thickness sensor, pressure transducer, the arrangenent diagram of temperature sensor on runner plate in the invention

Fig. 3 is that invention application work connects block diagram

Embodiment

Hydraulic generator thrust bearing running status dynamic monitoring system as shown in Figure 1, comprise temperature sensor, pressure transducer, the oil film thickness sensor, main frame, remote computer, main frame comprises PCM-3363CPU module U1, PCM-3910 power module U2, PCM-3835 memory module U3, the multi-functional acquisition module U4 of PCM-3718H, signal condition module U5, wi-fi wireless routing module U6, U1 wherein, U2, U3, the U4 module adopts the PC104 bus, be useful on contact pin and jack that bus connects on the module, U1, U2, U3, U4 stacks gradually with jack by these contact pins and connects together, form nesting structural embedded control, U5 links to each other with signaling interface on the U4 by signal connecting line, and U6 is connected to the network port of U1 by netting twine.Oil film thickness sensor S11, S12, S13, S14, pressure transducer S21, S22, S23, the output signal of S24 enters data collecting card U4, temperature sensor S31, S32, S33, form signal D31 behind the output signal process signal condition module U5 of S34, D32, D33, D34 also enters data acquisition capture card U4, system host is lubricated the supplemental characteristic collection, when hydraulic generator thrust bearing running status dynamic monitoring system main frame begins data acquisition, at first record current time T1, remote computer is obtained speed revolution value n and this numerical value is sent to system host from the unit speed probe simultaneously, system host during according to the sampling interval of rotating speed computational data capture card between ⊿ T, set the every rotation one circle system host of unit and can collect 600 groups of measurement data, then

$\mathrm{\ΔT}=\frac{1}{\frac{n}{60}\×600}=\frac{1}{10n}$

$\left(1\right)$

Setting the triggered time that next time gathers according to formula (1) is T1+ ⊿ T, this time is carried out data acquisition after arriving again, go round and begin again according to this and carry out, each data acquisition uploads to remote computer with measurement data by wireless communication module U6 after finishing, remote computer receive the laggard line number of data according to one's analysis, show, preserve.

All sensors of the present invention all is installed on the runner plate, and every kind of sensor is respectively along different radial distribution, and the arrangenent diagram of sensor on runner plate as shown in Figure 2.

Hydraulic generator thrust bearing running status dynamic monitoring system comprises temperature sensor, pressure transducer, oil film thickness sensor, main frame, remote computer.The installation of system is used as shown in Figure 3, and wherein: 1 is hydraulic generator rotor; 2 is hydraulic generator thrust bearing running status dynamic detection system main frame; 3 is the sensor line; 4 is thrust collar; 5 is runner plate; 6 is temperature, pressure, oil film thickness sensor; 7 is high-gain aerial; 8 is lower bearing bracket; 9 is remote computer.

System host 2 is installed on the rotor field spider of rotor 1, the oil film thickness, pressure, the temperature sensor 6 that are used for measurement thrust bearing lubrication parameter are installed in runner plate 5, guarantee that in thrust collar 4 borings sensor line 3 can be drawn out on the main frame 2, at remote computer 9 the wi-fi wireless network card is installed, the high-gain aerial 7 that is connected on the wireless network card is installed on the lower bearing bracket 8, carries out data communication with the wireless data transfer module composition WLAN (wireless local area network) of hydraulic generator thrust bearing running status dynamic monitoring system main frame.

After system starts working, carry out work according to following steps: 1. hydraulic generator thrust bearing running status dynamic monitoring system main frame carries out data acquisition, and the record acquisition time; 2. main frame upload the data to remote computer; 3. remote computer is obtained rotary speed data from the unit speed probe; 4. remote computer passes to main frame with tachometer value; 5. main frame calculates the time interval of twice collection according to rotating speed; 5. 1. repeating step arrive step when arrive interval time, the operation that goes round and begins again.

Then this monitoring system power supply supplies with the PCM-3910 power panel through the DC/DC module converts to the 12V direct current from the power taking of rotor-exciting system.

During unit operation, all be transferred to remote computer by the wi-fi wireless communication module after every collection one secondary data of the data collecting card of this monitoring system, remote computer is in-built wireless data communication program and thrust bearing lubrication parameter DAP, the lubrication parameter data that collect can be depicted as figure in order to show intuitively the running status of thrust bearing, simultaneously data be saved on the hard disc of computer.When finding that the thrust bearing oil film thickness is excessively thin, oil film pressure unusual or the temperature raising speed will the trigger alarm prompting when too fast, remind operating personnel to take further step, avoid occurring the accidents such as tile kilning, guarantee the security of operation of thrust bearing.

Claims (1)

1. hydraulic generator thrust bearing running status dynamic monitoring system, it is characterized in that: comprise temperature sensor, pressure transducer, the oil film thickness sensor, main frame, remote computer, main frame comprises PCM-3363CPU module U1, PCM-3910 power module U2, PCM-3835 memory module U3, the multi-functional acquisition module U4 of PCM-3718H, signal condition module U5, wi-fi wireless routing module U6, U1 wherein, U2, U3, U4 adopts the PC104 bus module, band is useful on contact pin and the jack that bus connects on the module, U1, U2, U3, U4 stacks gradually with jack by these contact pins and connects together, form nesting structural embedded control, U5 links to each other with signaling interface on the U4 by signal connecting line, U6 is connected to the network port of U1 by netting twine, oil film thickness sensor S11, S12, S13, S14, pressure transducer S21, S22, S23, the output signal of S24 enters data collecting card U4, temperature sensor S31, S32, S33, form signal D31 behind the output signal process signal condition module U5 of S34, D32, D33, D34 also enters data acquisition capture card U4, system host is lubricated the supplemental characteristic collection, when hydraulic generator thrust bearing running status dynamic monitoring system main frame begins data acquisition, at first record current time T1, remote computer is obtained speed revolution value n and this numerical value is sent to system host from the unit speed probe simultaneously, system host during according to the sampling interval of rotating speed computational data capture card between ⊿ T, set the every rotation one circle system host of unit and can collect 600 groups of measurement data, then

$\mathrm{\ΔT}=\frac{1}{\frac{n}{60}\×600}=\frac{1}{10n}$

$\left(1\right)$

Setting the triggered time that next time gathers according to formula (1) is T1+ ⊿ T, this time is carried out data acquisition after arriving again, go round and begin again according to this and carry out, each data acquisition uploads to remote computer with measurement data by wireless communication module U6 after finishing, remote computer receive the laggard line number of data according to one's analysis, show, preserve.

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