CN202560532U - Remote monitoring system for monitoring and fault diagnosis of running states of variable-frequency cooling tower fan - Google Patents
Remote monitoring system for monitoring and fault diagnosis of running states of variable-frequency cooling tower fan Download PDFInfo
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- CN202560532U CN202560532U CN201220005541XU CN201220005541U CN202560532U CN 202560532 U CN202560532 U CN 202560532U CN 201220005541X U CN201220005541X U CN 201220005541XU CN 201220005541 U CN201220005541 U CN 201220005541U CN 202560532 U CN202560532 U CN 202560532U
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Abstract
The utility model relates to a remote monitoring system for monitoring and fault diagnosis of running states of a variable-frequency cooling tower fan. The system is composed of a personal computer (PC), a cooling tower fan monitor terminal, an RS232/RS485 converter and an RS485 bus, wherein the cooling tower fan monitor terminal is connected with the RS232/RS485 converter through the RS485 bus, the RS232/RS485 converter is connected with the PC, the cooling tower fan monitor terminal is composed of a microprogrammed control unit (MCU), a blade fault monitoring circuit, a transmission shaft fault monitoring circuit, a vibration monitoring module, a motor current monitoring circuit, a gearbox oil level monitoring circuit, a gearbox oil temperature monitoring circuit, a motor speed monitoring circuit, a liquid crystal display (LCD) circuit, an alarm circuit, an on/off circuit, a watchdog circuit, a power circuit, a clock circuit, a reset circuit and an RS-485 switching circuit, and the blade fault monitoring circuit, the transmission shaft fault monitoring circuit, the vibration monitoring module, the motor current monitoring circuit, the gearbox oil level monitoring circuit, the gearbox oil temperature monitoring circuit, the motor speed monitoring circuit, the LCD circuit, the alarm circuit, the on/off circuit, the watchdog circuit, the power circuit, the clock circuit, the reset circuit and the RS-485 switching circuit are connected with the MCU. By the aid of the monitoring system, the reliability of fan fault monitoring is greatly improved, major accidents of the fan can be effectively reduced, and the system has good popularization and application values.
Description
Technical field
The utility model relates to blower fan of cooling tower monitoring running state and fault diagnosis field, the long distance control system of particularly a kind of frequency conversion blower fan of cooling tower monitoring running state and fault diagnosis.
Background technique
Blower fan of cooling tower is widely used in the industrial cycle water system of industries such as oil, chemical industry, electric power, metallurgy, and it mainly acts on is that industrial water with heat forces cooling, reaches the purpose that water cycle is used.Blower fan of cooling tower must long-time safe and continuous move as the key equipment in the circulation, and it is the visual plant of control circle cooling water temperature.The kind of drive of general blower fan of cooling tower be with motor arrangement outside tower, link through elongated transmission shaft and blower fan gear-box, gear-box adopts a pair of cone gear and a pair of column gear transmission, level is imported, VO vertical output.The blower fan of cooling tower structure is as shown in Figure 1.
Blower fan of cooling tower in use owing to reasons such as uneven inertia, loosening, corrosion, causes that equipment attrition aggravation, vibration increase, if can not in time find to handle, will cause that bearing burns, parts damage, even leaf destruction, transmission shaft such as throw away at serious accident.Therefore, for guaranteeing the reliable operation of blower fan, parameters such as fan blade, transmission shaft, gear case oil temperature, oil level are effectively monitored just very necessary.
Transmission shaft is the critical component of blower fan of cooling tower; Because it is big to make and install elongated transmission shaft difficulty, inevitably exist and make and alignment error, elongated transmission shaft is produced than large unbalance inertia; The vibration of elongated transmission shaft is the serious hidden danger that threatens blower fan operation steady in a long-term; Be no lack of in the engineering reality because drive shafts fracture throws away, smash whole typhoon machine and related facility, the case of the major accident that causes stopping production.
The volume of large cooling column fan blade and quality all big (the single blade quality reaches tens of kilograms); And rotating diameter and rotary inertia are big; Present homemade blower fan can only be in the whole static balancing of previous crops impeller of dispatching from the factory; Dispatching from the factory can't accurately return to the static balancing state before dispatching from the factory when the back is on-the-spot installs, and there is uneven inertia in work when rotating.The material of blower fan of cooling tower blade is generally composite material, and the workmanship of composite material blade is influenced by many technological factors such as glue, glass cloth, condition of cure, causes the conformity of blade and stability not high.So the leaf longevity discreteness is bigger, the situation that individual blade at first lost efficacy and fractures often takes place.See that from the situation of accident repeatedly individual blade not was moment to break off disengaging fully after losing efficacy and fractureing, but the blade that does not break off fully continues with the impeller rotation, and constantly hit other intact blade and relevant device, throw away until in strike, fractureing fully.Other intact blade is hit major injuries such as causing cracking, ruptures and scrap by brute force in this process, and breaks Other related equipment, and the destruction of causing is serious, loses greatly, recovers difficulty.During blower fan is resumed work at the scene,, be difficult to determine whether to exist invisible injury, whether can continue to use for visual intact component such as blade.In this case for guaranteeing safety, can only scrap in a large number and renew, cause than large economy loss and influence and produce.
At present domestic and imported exhausting formula blower fan of cooling tower generally is employed in the gear-box sidewall and the mode of vibration acceleration alarm is installed carries out malfunction monitoring and report to the police, and this alarm is mainly by the supply that forms a complete production network of blower fan manufacturer.Because the blower fan of cooling tower work under bad environment is complicated, it is serious that the vibration acceleration alarm is failed to report the wrong report problem at work, do not reach the purpose of minimizing accident and loss, and therefore most of user removes the vibration acceleration alarm, gives it up.
Use the enterprise of blower fan of cooling tower to adopt artificial generation of per hour patrolling and examining method minimizing accident once at present, mainly the means of patrolling and examining are the sound when listening fan operation, see the demonstration of ammeter and thermometer more.The factors such as experience and mood of patrolling and examining the workman play conclusive effect to patrolling and examining the result, cause to patrol and examine as a result that accuracy is not high, fault-free occurred and have shut down and the undiscovered phenomenon of fault arranged.Temperature is high on the cooling tower, the toxic and harmful that is corrosive, and difficult the observation, and this method makes that patrolling and examining labor strength strengthens, the skill security is protected and is required height, and very easily causes personal injury accidents.
In view of existing most of high-power blower fan of cooling tower have the variable-frequency speed-adjusting energy-saving function,, need the palm to understand the influence of frequency control of motor speed to the blower fan of cooling tower operating state monitoring system in order to study the malfunction monitoring of blower fan under the frequency control of motor speed state:
(1) load of blower fan is unstable; Be in the variation continually; With the method monitoring fan operation state of measuring ess-strain whether normally and whether fault is arranged, monitoring parameter is come and go, make that status parameter picks up, the setting of analysis and threshold value is complicated; Increase the design difficulty of monitoring equipment software and hardware, even be difficult to realize.
(2) during fan operation, the motion speed of each rotating component is in real-time change, and the vibration frequency of each part is also in variation.For the vibration analysis method that generally adopts is now carried out status monitoring and fault diagnosis has increased difficulty.This is because in the continuous variation of running speed; The vibratory response parameter that each fault takes place can constantly change; It is complicated that the CF vibration parameters is judged, the frequency domain that the vibration measuring monitoring system is difficult in time to change monitoring parameter picks up and failure judgment, is prone to cause failing to report or reporting by mistake of fault.
(3) pick up the monitoring equipment that related parameter was arranged with the periodicity time for employing, the time correlation threshold value needs real-time change.If threshold value value less (sensitivity) is prone to cause wrong report; If the threshold value value is bigger, can avoid wrong report, fail to report but be prone to cause.
At present, also do not have to realize long distance control system to frequency conversion blower fan of cooling tower monitoring running state and fault diagnosis.
Summary of the invention
The purpose of the utility model is to overcome the deficiency of existing technology; A kind of the realize omnibearing status monitoring of frequency conversion blower fan of cooling tower and fault diagnosis monitoring and multi-point remote monitoring are provided; Effectively improve the reliability of fan trouble monitoring, reduce the blower fan of cooling tower long distance control system of the generation of blower fan major accident.
It is to adopt following technological scheme to realize that the utility model solves its technical problem:
A kind of frequency conversion blower fan of cooling tower monitoring running state and fault diagnosis long distance control system; It is characterized in that: by PC, blower fan of cooling tower monitor terminal; RS232/RS485 transducer and RS485 bus constitute; The blower fan of cooling tower monitor terminal is connected to the RS232/RS485 transducer through the RS485 bus; The RS232/RS485 transducer connects PC, the blower fan of cooling tower monitor terminal by MCU and the blade fault observation circuit, transmission shaft fault monitoring circuit, vibration monitoring module, current of electric observation circuit, gear-box oil level observation circuit, gear case oil temperature observation circuit, motor speed observation circuit, LCD display circuit, the warning circuit that are connected with MCU, stop machine circuit, watchdog circuit, power circuit, clock circuit, reset circuit and RS-485 change-over circuit and constitute.
And described blower fan of cooling tower monitor terminal is one group of blower fan of cooling tower monitor terminal, and this group of blower fan of cooling tower monitor terminal all is connected to the RS232/RS485 transducer through the RS485 bus.
And; Described blade fault observation circuit comprises monitoring sensor; This monitoring sensor is made up of a Hall transducer and one group of magnet; Its concrete mounting structure is: install a magnet at each fan blade tip, at an air duct inwall fixed installation Hall transducer radially corresponding with magnet of blower fan.
And the monitoring sensor of described blade fault observation circuit is a photoelectric sensor, and this photoelectric sensor vertically is installed on the top near blade tip, is fixed in the air duct inwall through support.
And the monitoring sensor of described blade fault observation circuit installs a metal stick by constituting near switch and metal stick at each fan blade tip, the fixed installation of the air duct inwall of blower fan and magnet radially corresponding near switch.
And; Described transmission shaft fault monitoring circuit comprises monitoring sensor; Monitoring sensor adopts two electromagnetic sensors and two powerful magnet, and concrete mounting structure does, on the flange outer peripheral surface of two half-couplings of blower fan gear-box end transmission shaft coupling, respectively installs a strong magnets; The circumferential position of two magnet is at a distance of S, and two electromagnetic sensors are fixed at outside corresponding two magnet places at the flange outer peripheral surface of two half-couplings.
And described vibration monitoring module is made up of overflow alarm and vibration acceleration sensor of vibration, and vibration acceleration sensor is fixed in the gear-box sidewall, and the overflow signal output part of alarm of vibration links to each other with MCU, and the output signal is a digital signal.
And; Described current of electric observation circuit is made up of current transformer, three phase circuit transmitter, A/D conversion chip; Physical circuit is: every current transformer of installing mutually of the three-phase circuit between the circuit breaker of motor and frequency variator; Current transformer output is linked to each other with the input of three phase circuit transmitter, and the analogue signal of three phase circuit transmitter output converts digital signal input MCU into through the A/D conversion chip and carries out signal processing.
And described gear-box oil level observation circuit is made up of the float-ball type liquid-level switch that is installed in the outer oil ga(u)ge of tower, and the digital signal of float-ball type liquid-level switch output is directly imported MCU and carried out signal processing.
And; Described gear case oil temperature observation circuit is made up of PT100 integrative temperature transmitter and A/D conversion chip; The PT100 integrative temperature transmitter is through the oil temperature in the plug cock hole monitoring gear-box that is installed in gear-box, and the analogue signal of PT100 integrative temperature transmitter output converts digital signal input MCU into through the A/D conversion chip and carries out signal processing.
And; Described motor speed observation circuit comprises monitoring sensor; Monitoring sensor adopts a Hall transducer and a strong magnets; Concrete mounting structure does, on the flange outer peripheral surface of a half-coupling of fan motor end transmission shaft coupling, installs a strong magnets, the fixing Hall transducer at the outside corresponding magnet of the flange outer peripheral surface place of this half-coupling.
Advantage of the utility model and beneficial effect are:
1. main application of RS 485 buses of the blower fan of cooling tower long distance control system of the utility model realize the point-to-multipoint communication of PC and a plurality of monitor terminals, thereby have realized the Centralized Monitoring and the management function of blower fan of cooling tower.Monitor the running state of blower fan of cooling tower blade, transmission shaft, fan vibration situation, gear-box oil level and oily gentle current of electric in real time through PC; When running state occurs unusual or breaks down; Supervisory system is sent acoustooptic alarm, and the control blower fan of cooling tower is shut down; Blower fan of cooling tower monitor terminal major function has: blade fault monitoring and warning are shut down, transmission shaft failure monitoring and the shutdown of reporting to the police, the shutdown of current of electric overload alarm, gear-box liquid level and the detection of oil temperature, blade rotational speed detection, can also control the machine of the stopping state of blower fan of cooling tower in addition.And when this blower fan of cooling tower long distance control system can realize when rotating speed behind the motor frequency conversion takes place, changing, the function of corresponding change also took place in the monitoring threshold of blade and transmission shaft thereupon, reaches the purpose to frequency conversion blower fan of cooling tower malfunction monitoring.
2. the blower fan of cooling tower long distance control system of the utility model mainly is to causing the transmission shaft of serious accident and leaf destruction to throw away this two kinds of faults easily; Proposed safe and reliable, cost is lower, be applicable to the monitoring method of practical applications; Simultaneously parameters such as gear case oil temperature, oil level, vibration acceleration are monitored in real time; So that in time understand and grasp the working state of equipment in running, diagnosis is out of order and is reported to the police shutdown when accident is about to take place.Can improve the reliability and the effective time of equipment operation so greatly, reasonably arrange the time, further improve the utilization rate of equipment, thereby guarantee that enterprise production safety carries out smoothly, avoid enterprise to cause heavy losses for the conventional maintenance of equipment and maintenance.
3. the blower fan of cooling tower long distance control system reasonable in design of the utility model, production practices prove that this monitoring system has obviously improved the reliability of fan trouble monitoring, can reduce the generation of blower fan major accident effectively, has good application value.
Description of drawings
Fig. 1 is the blower fan of cooling tower structural representation;
Fig. 2 is a blower fan of cooling tower long distance control system schematic diagram;
Fig. 3 is a blower fan of cooling tower monitor terminal circuit diagram;
Fig. 4 is a blower fan of cooling tower monitor terminal monitor program flow chart.
Description of reference numerals in the utility model accompanying drawing.
1-blade 2-wheel hub 3-blast cap 4-gear-box
5-transmission shaft 6-lubricant pipe 7-motor 8-motor base (frame)
9-supports main I-steel 10-speed reducer bearing 11-air duct
Embodiment
Below in conjunction with accompanying drawing the utility model frequency conversion blower fan of cooling tower monitoring running state and fault diagnosis long distance control system are done further explain.
As shown in Figure 1; Frequency conversion blower fan of cooling tower and mounting structure are: be made up of blade, wheel hub, blast cap, gear-box, transmission shaft, lubricant pipe, motor, motor base (frame), the main I-steel of support, speed reducer bearing, blade, wheel hub, blast cap, gearbox drive axle are installed in the air duct.Motor, motor base (frame) are installed in the air duct outside.
As shown in Figure 2; Frequency conversion blower fan of cooling tower monitoring running state of the utility model and fault diagnosis long distance control system; By PC, blower fan of cooling tower monitor terminal; RS232/RS485 transducer and RS485 bus constitute, and the blower fan of cooling tower supervisory system is connected to the RS232/RS485 transducer through the RS485 bus, and the RS232/RS485 transducer connects PC.The blower fan of cooling tower monitor terminal is one group of blower fan of cooling tower monitor terminal, and this group of blower fan of cooling tower monitor terminal all is connected to the RS232/RS485 transducer through the RS485 bus.
PC is used to monitor all blower fan of cooling tower monitor terminal situation as upper-position unit, and the detected various data of blower fan of cooling tower monitor terminal send PC to through the RS485 bus, accomplishes the system monitoring function.Monitor terminal adopts RS485 transponder chip 75LBC184 to accomplish by the conversion of single-chip microcomputer to the RS485 serial data interface.PC has adopted 485HE externally-arranged type RS232/RS485 transducer, directly inserts the serial ports of PC, utilizes the power supply of PC serial ports, has to receive to send conversion automatically, need not RTS control, and softwarecompatible is extensive.Each lower-position unit is provided with only address, and can not communication between the lower-position unit, and all communications receive PC control.When system moved, all lower-position units waited for that upper-position units send instruction.When upper-position unit sends when instruction, all lower-position units all receive and address frame that will be wherein and own address relatively, if identical then continue the instruction or the data of reception back.Advantages such as native system adopts the RS485 bus to reach the purpose of remote monitoring, mainly is because the RS485 bus has communication distance (can reach 1219m) far away at hardware aspect, can realize point-to-multipoint communication, and bus circuit is simple, and is easy for installation.
Main application of RS 485 buses of this blower fan of cooling tower long distance control system realize the point-to-multipoint communication of PC and a plurality of monitor terminals, thereby have realized the Centralized Monitoring and the management function of blower fan of cooling tower.Monitor the running state of blower fan of cooling tower blade, transmission shaft, fan vibration situation, gear-box oil level and oily gentle current of electric in real time through PC; When running state occurs unusual or breaks down; Supervisory system is sent acoustooptic alarm, and the control blower fan of cooling tower is shut down; Blower fan of cooling tower monitor terminal major function has: blade fault monitoring and warning are shut down, transmission shaft failure monitoring and the shutdown of reporting to the police, the shutdown of current of electric overload alarm, gear-box liquid level and the detection of oil temperature, blade rotational speed detection, can also control the machine of the stopping state of blower fan of cooling tower in addition.
Blower fan of cooling tower monitor terminal in the utility model blower fan of cooling tower long distance control system is reached the blade fault observation circuit that is connected with MCU by MCU (model is AT89C52); The transmission shaft fault monitoring circuit; The vibration monitoring module; The current of electric observation circuit; Gear-box oil level observation circuit; Gear case oil temperature observation circuit; The motor speed observation circuit; The LCD display circuit; Warning circuit; Stop machine circuit; Watchdog circuit; Power circuit; Clock circuit; Reset circuit and RS-485 change-over circuit constitute.
Adopt the relay output alarm and shut down, when fault takes place, cut off the power supply of blower fan of cooling tower, concurrently speak, the light warning through relay.In order to prevent that single-chip microcomputer from receiving extraneous interference when working, cause program running interruption, system to stagnate, native system has designed watchdog circuit, can make single-chip microcomputer under the unmanned state, realize continuous operation effectively.
The blade fault observation circuit comprises monitoring sensor; This monitoring sensor is made up of a Hall transducer and one group of magnet; Its concrete mounting structure is: install a magnet at each fan blade tip, at an air duct inwall fixed installation Hall transducer radially corresponding with magnet of blower fan.Specifically ask for an interview Chinese utility model patent: a kind of early warning and alarming system (patent No.: 201020288838.2) that is used for the blower fan of cooling tower blade fault.
The monitoring sensor of blade fault observation circuit is a photoelectric sensor, and this photoelectric sensor vertically is installed on the top near blade tip, is fixed in the air duct inwall through support.
The monitoring sensor of blade fault observation circuit installs a metal stick by constituting near switch and metal stick at each fan blade tip, the fixed installation of the air duct inwall of blower fan and magnet radially corresponding near switch.
The transmission shaft fault monitoring circuit comprises that monitoring sensor constitutes; Monitoring sensor adopts two electromagnetic sensors and two powerful magnet; Concrete mounting structure does; On the flange outer peripheral surface of two half-couplings of blower fan transmission shaft coupling, respectively install a strong magnets, the circumferential position of two magnet is at a distance of S, fixing two electromagnetic sensors at the outside corresponding two magnet places of the flange outer peripheral surface of two half-couplings; Said controller is a single-chip microcomputer.The circumferential position of two magnet is π R/120 apart from S, and R is the coupling flange diameter.The circle center line connecting of two electromagnetic sensors is parallel to drive shaft axis.Specifically ask for an interview Chinese utility model patent: a kind of early warning and alarming system (patent No.: 201020288840.X) that is used for blower fan of cooling tower transmission shaft fault.
The blade fault observation circuit comprises monitoring sensor; This monitoring sensor is made up of a Hall transducer and one group of magnet; Its concrete mounting structure is: install a magnet at each fan blade tip, at an air duct inwall fixed installation Hall transducer radially corresponding with magnet of blower fan.MCU receives and handles the pulse signal of Hall transducer output in real time, realizes the blade fault monitoring.This monitoring sensor can replace Hall transducer and magnet by photoelectric sensor; Also can replace magnet by the metal stick by replacing Hall transducer near switch.
The transmission shaft fault monitoring circuit comprises monitoring sensor; Monitoring sensor adopts two electromagnetic sensors and two powerful magnet; Concrete mounting structure does; On the flange outer peripheral surface of two half-couplings of blower fan gear-box end transmission shaft coupling, respectively install a strong magnets, the circumferential position of two magnet is at a distance of S, fixing two electromagnetic sensors at the outside corresponding two magnet places of the flange outer peripheral surface of two half-couplings.MCU receives and handles the pulse signal of two electromagnetic sensors output in real time, realizes the transmission shaft malfunction monitoring.
The vibration monitoring module is made up of overflow alarm and vibration acceleration sensor of vibration, and vibration acceleration sensor is fixed in the gear-box sidewall.Vibration monitoring module by signal output terminal links to each other with MCU, and the output signal is a digital signal.When work; The vibration monitoring module is monitored the vibration acceleration situation of blower fan in real time, can be through the overflow preset vibrational state alarm threshold value of adjustment panel of alarm of vibration, when blower fan work is undesired; When vibratory output surpasses alarm threshold value; The vibration alarm that overflows can be exported a digital signal, and MCU receives and handle this digital signal in real time, realizes vibration monitoring.The overflow signal output part of alarm of vibration links to each other with MCU.
The current of electric observation circuit is made up of current transformer, three phase circuit transmitter, A/D conversion chip; Its working principle is: every current transformer of installing mutually of the three-phase circuit between circuit breaker and frequency variator; Current transformer output is linked to each other with the input of three phase circuit transmitter; The analogue signal of three phase circuit transmitter output converts digital signal into through the A/D conversion chip, and MCU receives and handle this digital signal in real time, realizes the current of electric monitoring.
Gear-box oil level observation circuit is made up of the float-ball type liquid-level switch that is installed in the outer oil ga(u)ge of tower, and MCU receives and handle the digital signal of float-ball type liquid-level switch output in real time, realizes the monitoring of gear-box oil level.
Gear case oil temperature observation circuit is made up of PT100 integrative temperature transmitter and A/D conversion chip; The PT100 integrative temperature transmitter is through the oil temperature in the plug cock hole monitoring gear-box that is installed in gear-box; The analogue signal of PT100 integrative temperature transmitter output converts digital signal into through the A/D conversion chip; MCU receives and handles this digital signal in real time, realizes the monitoring of gear case oil temperature.
The motor speed observation circuit is by comprising monitoring sensor; Monitoring sensor adopts a Hall transducer and a strong magnets; Concrete mounting structure does; On the flange outer peripheral surface of a half-coupling of fan motor end transmission shaft coupling, install a strong magnets, a fixing Hall transducer at the outside corresponding magnet of the flange outer peripheral surface place of this half-coupling.MCU receives and handles the pulse signal of Hall transducer output in real time, realizes the motor speed monitoring.
The main purpose of the utility model is to causing the transmission shaft of serious accident and leaf destruction to throw away this two kinds of faults easily; Propose a kind of safe and reliable, cost is lower, be applicable to the monitoring method of practical applications; Simultaneously parameters such as gear case oil temperature, oil level are monitored in real time; So that in time understand and grasp the working state of equipment in running, diagnosis is out of order and is reported to the police shutdown when accident is about to take place.Can improve the reliability and the effective time of equipment operation so greatly, reasonably arrange the time, further improve the utilization rate of equipment, thereby guarantee that enterprise production safety carries out smoothly, avoid enterprise to cause heavy losses for the conventional maintenance of equipment and maintenance.Therefore, research blower fan of cooling tower monitoring running state and method for diagnosing faults are of great immediate significance.
The monitor program flow chart of blower fan of cooling tower monitor terminal (lower-position unit) is as shown in Figure 3; Start blower fan after the supervisory system initialization; When programming, set the monitoring delay time; To guarantee implementing monitoring function in the stable back of fan operation, promptly behind fan starting in the certain hour supervisory system blower fan of cooling tower is not monitored in real time so that blower fan of cooling tower reaches the oepration at full load state; When surpassing the monitoring delay time that sets; Be that supervisory system began each monitoring point is monitored after fan operation was stablized, these monitoring points mainly comprise: blade fault monitoring, transmission shaft malfunction monitoring, vibration monitoring, the monitoring of gear case oil temperature, the monitoring of gear-box oil level, current of electric monitoring, motor speed monitoring.When frequency conversion blower fan of cooling tower rotating speed changed, the motor speed monitoring facilities is adjustment blade and transmission shaft malfunction monitoring threshold value in time, to reach the purpose that the frequency conversion blower fan of cooling tower is monitored in real time.When blade or transmission shaft break down or be out of shape, surpass when setting threshold value, blade or transmission shaft malfunction monitoring program can be sent blower fan and shut down and the acousto-optic alarm command, and the wait staff carries out handled.When the fan vibration amount surpassed alarm threshold value, the vibration monitoring program can be shut down and the acousto-optic alarm command by blower fan, waited for that the staff carries out handled.When gear case oil temperature or oil level, current of electric exceed when setting threshold value; When gear case oil temperature monitoring facilities, gear-box oil level monitoring facilities or current of electric monitoring facilities can at first send the acoustooptic alarm order; If in set time, there is not the staff that warning is handled; These monitoring facilitieses can continue to send the blower fan halt command, take place to prevent security incident; If the staff handles corresponding failure in set time, can stop acoustooptic alarm according to the fault order of severity, continue to keep fan operation or control blower fan to shut down, handle accordingly.
The ipc monitor interface
The upper-position unit management system is based on the MSCOMM serial ports control of VC6.0; Receive the power-up state order of control unit with interrupt mode when serial ports after, adopt regularly the inquiry mode wheel to sweep each lower-position unit monitoring cell, PC uses timed events; Each slave station of timing taking turn; The slave station of being examined uploads to PC with one group of latest data, and each takes turns to patrol and examine approximately needs about 1s, and the concrete time can be decided with timing and relevant time-delay by baud rate.Adopt interrupt mode to receive Monitoring Data after sending upload command, and accomplish the data management functions such as arrangement, storage, demonstration, printing of data.
The ipc monitor interface of blower fan of cooling tower remote supervision system mainly comprises illustraton of model and blade running state, transmission shaft running state, vibrational state, each alternate current status of main circuit, motor start and stop state, gear case oil temperature state, the gear-box oil level state of blower fan of cooling tower.This supervisory system has mainly comprised process interface, warning interface, trend interface, filing interface.Master control interface has mainly comprised supervisory system title, current time, current display interface and running state process.In main menu, if system's operation is normal, blade, transmission shaft, oil level warning etc. locate to show green " normally " two words, in case appearance is unusual, with shown in red " fault " two words, supervisory system is sent acoustooptic alarm simultaneously.
Claims (11)
1. frequency conversion blower fan of cooling tower monitoring running state and fault diagnosis long distance control system; It is characterized in that: by PC, blower fan of cooling tower monitor terminal; RS232/RS485 transducer and RS485 bus constitute; The blower fan of cooling tower monitor terminal is connected to the RS232/RS485 transducer through the RS485 bus; The RS232/RS485 transducer connects PC, the blower fan of cooling tower monitor terminal by MCU and the blade fault observation circuit, transmission shaft fault monitoring circuit, vibration monitoring module, current of electric observation circuit, gear-box oil level observation circuit, gear case oil temperature observation circuit, motor speed observation circuit, LCD display circuit, the warning circuit that are connected with MCU, stop machine circuit, watchdog circuit, power circuit, clock circuit, reset circuit and RS-485 change-over circuit and constitute.
2. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described blower fan of cooling tower monitor terminal is one group of blower fan of cooling tower monitor terminal, and this group of blower fan of cooling tower monitor terminal all is connected to the RS232/RS485 transducer through the RS485 bus.
3. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described blade fault observation circuit comprises monitoring sensor; This monitoring sensor is made up of a Hall transducer and one group of magnet; Its concrete mounting structure is: at the most advanced and sophisticated fixed installation of each fan blade one magnet, at an air duct inwall fixed installation Hall transducer radially corresponding with magnet of blower fan.
4. frequency conversion blower fan of cooling tower monitoring running state according to claim 3 and fault diagnosis long distance control system; It is characterized in that: the monitoring sensor of described blade fault observation circuit is a photoelectric sensor; This photoelectric sensor vertically is installed on the top near blade tip, is fixed in the air duct inwall through support.
5. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described blade fault observation circuit comprises monitoring sensor; The monitoring sensor of said blade fault observation circuit is by constituting near switch and metal stick; Install a metal stick at each fan blade tip, the fixed installation of the air duct inwall of blower fan and magnet radially corresponding near switch.
6. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described transmission shaft fault monitoring circuit comprises monitoring sensor; Monitoring sensor adopts two electromagnetic sensors and two powerful magnet; Concrete mounting structure does; On the flange outer peripheral surface of two half-couplings of blower fan gear-box end transmission shaft coupling, respectively install a strong magnets, the circumferential position of two magnet is at a distance of S, fixing two electromagnetic sensors at the outside corresponding two magnet places of the flange outer peripheral surface of two half-couplings.
7. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described vibration monitoring module is made up of overflow alarm and vibration acceleration sensor of vibration; Vibration acceleration sensor is fixed in the gear-box sidewall; The overflow signal output part of alarm of vibration links to each other with MCU, and the output signal is a digital signal.
8. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described current of electric observation circuit is made up of current transformer, three phase circuit transmitter, A/D conversion chip; Physical circuit is: every current transformer of installing mutually of the three-phase circuit between the circuit breaker of motor and frequency variator; Current transformer output is linked to each other with the input of three phase circuit transmitter, and the analogue signal of three phase circuit transmitter output converts digital signal input MCU into through the A/D conversion chip and carries out signal processing.
9. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described gear-box oil level observation circuit is made up of the float-ball type liquid-level switch that is installed in the outer oil ga(u)ge of tower, and the digital signal of float-ball type liquid-level switch output is directly imported MCU and carried out signal processing.
10. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described gear case oil temperature observation circuit is made up of PT100 integrative temperature transmitter and A/D conversion chip; The PT100 integrative temperature transmitter is through the oil temperature in the plug cock hole monitoring gear-box that is installed in gear-box, and the analogue signal of PT100 integrative temperature transmitter output converts digital signal input MCU into through the A/D conversion chip and carries out signal processing.
11. frequency conversion blower fan of cooling tower monitoring running state according to claim 1 and fault diagnosis long distance control system; It is characterized in that: described motor speed observation circuit comprises monitoring sensor; Monitoring sensor adopts a Hall transducer and a strong magnets; Concrete mounting structure does; On the flange outer peripheral surface of a half-coupling of fan motor end transmission shaft coupling, install a strong magnets, a fixing Hall transducer at the outside corresponding magnet of the flange outer peripheral surface place of this half-coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220005541XU CN202560532U (en) | 2012-01-09 | 2012-01-09 | Remote monitoring system for monitoring and fault diagnosis of running states of variable-frequency cooling tower fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220005541XU CN202560532U (en) | 2012-01-09 | 2012-01-09 | Remote monitoring system for monitoring and fault diagnosis of running states of variable-frequency cooling tower fan |
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| CN202560532U true CN202560532U (en) | 2012-11-28 |
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| CN201220005541XU Expired - Lifetime CN202560532U (en) | 2012-01-09 | 2012-01-09 | Remote monitoring system for monitoring and fault diagnosis of running states of variable-frequency cooling tower fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454589A (en) * | 2012-01-09 | 2012-05-16 | 天津科技大学 | Frequency conversion cooling tower fan running state monitoring and fault diagnosis remote monitor system |
| CN108548432A (en) * | 2018-04-25 | 2018-09-18 | 国网上海市电力公司 | A kind of cooling tower air inlet fan system |
-
2012
- 2012-01-09 CN CN201220005541XU patent/CN202560532U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454589A (en) * | 2012-01-09 | 2012-05-16 | 天津科技大学 | Frequency conversion cooling tower fan running state monitoring and fault diagnosis remote monitor system |
| CN108548432A (en) * | 2018-04-25 | 2018-09-18 | 国网上海市电力公司 | A kind of cooling tower air inlet fan system |
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