CN101738134B - Automatic deicing control system of cooling tower fan - Google Patents
Automatic deicing control system of cooling tower fan Download PDFInfo
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- CN101738134B CN101738134B CN2009102618760A CN200910261876A CN101738134B CN 101738134 B CN101738134 B CN 101738134B CN 2009102618760 A CN2009102618760 A CN 2009102618760A CN 200910261876 A CN200910261876 A CN 200910261876A CN 101738134 B CN101738134 B CN 101738134B
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Abstract
The invention provides an automatic deicing control system of a cooling tower fan, which comprises a double-speed motor M, an MCC control cabinet and a PLC. A three-phase power sources is connected to the double-speed motor M, a power circuit of the double-speed motor M is also connected with the MCC control cabinet through a current inductor, the MCC control cabinet is connected with a spot operation box, and the whole control system is also connected with the PLC. Through the system, the cooling tower can be automatically deiced under a cold climate with low operation cost and maintenance cost.
Description
Technical field
The present invention relates to cold district blower fan of cooling tower automated de-icing system.
Background technology
In iron and steel metallurgical industry, cooling tower is a requisite heat-exchange apparatus in the circular water treating system.Yet at cold district, particularly in the winter time, the icing phenomenon of its blower fan is serious before the cooling tower operation, all brings many difficulties for safety in production and Operation and Maintenance.At China's cold district, can reach 5 wheat harvesting periods local annual ice period, and minimum temperature reaches subzero 40 ℃.Get into winter, it is serious on cooling tower air inlet shutter, to freeze, and makes whole shutter form the ice curtain; Almost sealed inlet and outlet; Cause passing in and out the wind incoming air area and reduce, the turnover air quantity reduces, and influences the cooling effect of tower; Ice curtain in addition and possibly throw away in that motor is in service, also have serious potential safety hazard.In order to guarantee the normal operation and the cooling effect of cooling tower, common way is to let the operator make a hole in the ice, but in the process of making a hole in the ice, might damage together with shutter, has caused the significant wastage of human and material resources.In the coldest, even filler is frozen, after filler freezes, influence the efficient of filler, also influence the cooling effect of tower.What is more, and the loading of the ice that is increased after freezing may cause distortion on the cooling tower structure, cave in.The anti-icing method of common in the market cooling tower has methods such as anti-frozen pipe, shower are installed, but this all need increase construction, operation and the maintenance cost of cooling tower.
Summary of the invention
Technical problem to be solved by this invention is: a kind of automatic deicing control system of cooling tower fan is provided, and can be the cooling tower automatic de-icing under cold climate through native system, and operation and maintenance cost are low.
The technical scheme that the present invention adopted is: comprise double-speed motor M, MCC switch board and PLC; The three-phase electrical source of power is connected to double-speed motor M, also is connected to the MCC switch board through current transformer on the powered wire between three-phase electrical source of power and the double-speed motor M, is connected to execute-in-place case and PLC on the MCC switch board;
Three phase line L1 of said three-phase electrical source of power, L2, L3 are divided into two-way after through circuit breaker Q 01; The contactor K01 of leading up to often opens main contact and is connected to double-speed motor M; Another road is often opened main contact through contactor K02 and is connected to double-speed motor M, also is connected to current transformer T on this two-way powered wire respectively
a, T
cAnd T
A1, T
C1, the two ends of contactor K01 are connected to the reverse contactor K04 of three-phase and often open main contact, and contactor K01 often leaves and also is connected to the contactor K03 that three-phase is connected together between main contact and the double-speed motor M and often opens main contact;
Said current transformer T
a, T
cBe connected to MCC switch board, T through electrothermal relay F01 thermal element, ammeter PA
A1, T
C1Be connected to the MCC switch board through electrothermal relay F02 thermal element, ammeter PA1;
Said two line traffic control power supplys are connected to the MCC switch board through circuit breaker Q 11, comprise low cruise control loop, low speed and reverse operation control loop, high-speed cruising control loop, winding switching controls loop, low speed SBR control loop, high speed SBR control loop, Fault Control loop, indicating fault control loop in the MCC switch board, stop to indicate control loop, low cruise to indicate control loop, low speed and reverse operation indication control loop and high-speed cruising indication control loop;
Be connected between two lines of said two line traffic control power supplys:
Drawing a branch road between the button S3 of the band normally closed interlock in the low cruise control loop and the contact 5 of universal seclector S6 is connected to contactor K04 and often opens auxiliary contact; Draw the button S2 that a branch road is connected to the band normally open contact between the button S1 of the contact 2 of universal seclector S6 and band normally open contact; Draw a branch road between the contact 6 of universal seclector S6 and relay K 20 normally open contacts and be connected to relay K 21 normally open contacts; Again successively through the normally closed auxiliary contact of contactor K01, contactor K04 coil, control loop was moved as low speed and reverse in this loop after these three branch roads converged;
Draw a branch road between relay K 10 normally closed interlocks, the normally closed auxiliary contact of contactor K03; Be divided into three the tunnel behind the button S5 through relay K 12 normally open contacts, K24 normally closed interlock, band normally closed interlock successively again; One the tunnel is connected to contactor K02 often opens auxiliary contact; Another road is connected to the contact 7,8 of universal seclector S6 and the button S4 of band normally open contact successively; Third Road is connected to contact 11,12 and relay K 23 normally open contacts of universal seclector S6 successively, this three the tunnel converge after more successively through the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of contactor K04, contactor K02 coil, this loop is as the high-speed cruising control loop;
Button S5, the universal seclector S6 of the button S4 of the button S3 of the button S2 of the button S1 of band normally open contact, band normally open contact, band normally closed interlock, band normally open contact, band normally closed interlock are positioned at the execute-in-place case;
Draw a branch road between the normally closed auxiliary contact of contactor K04 of high-speed cruising control loop and the contactor K02 coil and be connected to contactor K03 coil, this loop is as winding switching controls loop;
Circuit breaker Q 01 auxiliary contact OF, electrothermal relay F01 normally closed interlock, relay K 11 coils of connecting successively, this loop is as the lower-speed state control loop;
Draw a branch road between the circuit breaker Q 01 auxiliary contact OF of lower-speed state control loop and the electrothermal relay F01 normally closed interlock, this branch road is connected to electrothermal relay F02 normally closed interlock, relay K 12 coils successively, and this loop is as high speed SBR control loop;
Circuit breaker Q 01 Alarm contactor SD, electrothermal relay F01 normally open contact, the electrothermal relay F02 normally open contact of parallel connection are connected to relay K 10 coils after these three branch roads converge again, and this loop is as the Fault Control loop;
The normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of K02, the normally closed auxiliary contact of K04 of series connection are connected to parallelly connected indicator lamp H1 and H2 then, and this loop is as stopping to indicate control loop;
Contactor K01 often leaves indicator lamp H2 and the H3 that auxiliary contact is connected to parallel connection, and control loop is indicated as low cruise in this loop;
Contactor K04 often leaves indicator lamp H3 and the H4 that auxiliary contact is connected to parallel connection, and this loop is as low speed and reverse operation indication control loop;
The contactor K02 of series connection often leaves auxiliary contact, K03 and often opens auxiliary contact, is connected to the indicator lamp H4 and the H5 of parallel connection again, and control loop is indicated as high-speed cruising in this loop;
Indicator lamp H1, H2, H3 and H4 are positioned at the execute-in-place case.
Said PLC comprises PLC input/output module ASI1 and ASI2;
The pin 14 and 15 of modules A SI1 is connected to relay K 20 coils; Pin 17 and 18 is connected to relay K 21 coils; Pin 19 and 20 is connected to relay K 22 coils, is connected to relay K 10 normally open contacts between the pin 2 and 8, is connected to contactor K01 between the pin 3 and 9 and often opens auxiliary contact; Be connected to contactor K04 between the pin 5 and 11 and often open auxiliary contact, the contactor K02 that is connected to series connection between the pin 6 and 12 often opens auxiliary contact, K03 and often opens auxiliary contact;
The pin 8 and 9 of modules A SI2 is connected to relay K 23 coils, and pin 10 and 11 is connected to relay K 24 coils, is connected to relay K 11 normally open contacts between the pin 5 and 2, is connected to relay K 12 normally open contacts between the pin 6 and 3.
Advantage of the present invention: after using this control system, only need selected automatic de-icing mode of operation on HMI (actual effect can be come on-the-spot adjustment through setting the blower fan reversing time), the freezing various influences that cause just can be eliminated by system.It is the damage of making a hole in the ice and possibly cause equipment that the people had both been avoided in the application of this cover system, has saved manpower and materials, can also prevent freezing equipment to be caused a series of influences.Compare with other technologies on the market, this programme is simple, and the deicing effect is comparatively obvious, efficiently solves the situation that winter, exclusive cooling tower seriously froze, and has improved the reliability of cooling tower self-operating.
Description of drawings
Fig. 1 is the power loop circuit diagram.
Fig. 2 is running control circuit figure.
Fig. 3 is state and indicating circuit figure.
Fig. 4 is the I/O of PLC system (input and output) some allocation plan.When at the enterprising line operate of HMI (man-machine interface), accomplish supervision and and start and stop control to motor status through the input and output point of PLC.
Native system has been realized high-speed cruising, low cruise, three kinds of methods of operation of low speed and reverse operation of double-speed motor, and carries out start stop operation on control box and the HMI (man-machine interface) at the scene.Among the figure, M: double-speed motor; Q: breaker; K: contactor and auxiliary reclay; F: electrothermal relay; T: current transformer; S: selector switch and button; H: indicator lamp; PA: ammeter.
Fig. 5 is the operation principle flow chart.Through timing program, no matter which kind of duty blower fan was in originally, can regularly let blower fan of cooling tower automatically switch to the low speed and reverse operation, deicing is back to former running status after accomplishing voluntarily.
The specific embodiment
The purpose of using cooling tower is to reduce the temperature of water in the tower.Pass through blower fan when using at ordinary times and just changeing the higher air of temperature in the extraction tower, through transmission of heat by contact and evaporative heat loss, airborne heat is pulled away, and water temperature also decreases.And the also source of our deicing system institute calorific requirement just of these heats; When blower fan reversed, the air of high temperature was not directly taken away in the tower, but was depressed to diffusion all around by wind-force; Hot blast can pass through shutter and be discharged to outside the tower; Similar employing hair dryer purges icicle in the tower, thereby reaches good deicing effect, can remove the ice curtain that generates in the cooling tower.This automatic deicing control system adopts double-speed motor to cooperate the electric control loop of band double speed and reverse function, through corresponding control programs, makes blower fan of cooling tower can accomplish the task of automatic de-icing.
Machine system double-speed motor power loop and control loop circuit diagram are not advanced for machine is other in Fig. 1～4, can satisfy 3 kinds of methods of operation of blower fan of cooling tower: the operation of a. high-speed cruising b. low cruise c. low speed and reverse.High-speed cruising reduces water temperature with the air quantity that low cruise can produce different sizes, and low speed and reverse then is that deicing is special-purpose.
The cooling tower automatic deicing control system, mainly form by electric control loop and automatic control program two parts:
(1) electric control loop: the hardware environment that is whole system.Shown in accompanying drawing, according to the requirement of heat exchange, blower fan of cooling tower generally adopts double-speed motor, divides at a high speed and low speed.At this motor is on the basis of double-speed motor, and we design the electric control loop that has high-speed cruising, low cruise, low speed and reverse operation function, can satisfy simultaneously by the machine, the function of centralized operation switches.
It comprises double-speed motor, MCC (Motor Control Center, Electric Machine Control center) switch board, PLC (programmable logic controller (PLC)) cabinet, HMI (man-machine interface), execute-in-place case.
The annexation of each parts is: all electrical controls and protecting component have been installed in the MCC switch board, and K01～04 is the operation contactor, and function is following separately for it: when K01 is closed, and low cruise; When K02 and K03 are closed, high-speed cruising; When K04 was closed, the low speed and reverse operation had the electrical interlocks function between each running status, had avoided a plurality of contactors while closures and damage equipment.On-the-spot selector switch, button, indicator lamp etc. are installed in the execute-in-place case, are convenient at the scene double-speed motor operated.Selector switch can to by the machine, centralized operation switches, and when maintenance or on-the-spot emergency, selector switch is threaded to the other operation of machine, this moment, blower fan of cooling tower was in the other manual state of a control of machine fully, not influenced by any of PLC equipment and program.When selector switch is threaded to centralized operation, blower fan of cooling tower can carry out operations such as manual start and stop, automatic de-icing on HMI.
(2) automatic control program: general whenever just need carry out a deicing at a distance from 24 hours and operate in season of cold.Do not need human intervention for the purpose that reaches automatic de-icing, use the logic control program of PLC to accomplish automatic control task.When after selecting the automatic de-icing pattern on the HMI, program flow diagram is as shown in Figure 5.
Generally, double-speed motor the state of counter-rotating before the deicing nothing more than in high-speed cruising, low cruise, stop three kinds of states.For avoiding that double-speed motor is caused damage, we switch and directly switch can not be at motor rotation the time carrying out rotating, and must shut down earlier and could change the direction startup through the motors such as delay of certain hour again after static fully.When preparation beginning deicing is accomplished in the program timing; Can detect earlier present motor is in which kind of duty (low speed or stop) at a high speed, and notes this duty; It is (at a high speed different with the time of repose of low speed then to shut down and leave standstill the back that remains static fully like motor in operation; Can set according to actual conditions), open motor to low speed and reverse, the beginning deicing.Program autostop after deicing in about 30 minutes is accomplished, and on request motor is switched to former duty.This program is the Automatic Control program, need not think intervention fully.After using this control system, only need selected automatic de-icing mode of operation on HMI (actual effect can be come on-the-spot adjustment through setting the blower fan reversing time), the freezing various influences that cause just can be eliminated by system.It is the damage of making a hole in the ice and possibly cause equipment that the people had both been avoided in the application of this cover system, has saved manpower and materials, can also prevent freezing equipment to be caused a series of influences.Compare with other technologies on the market, this programme is simple, and the deicing effect is comparatively obvious, efficiently solves the situation that winter, exclusive blower fan of cooling tower blade seriously froze, and has improved the effect and the reliability of cooling tower self-operating.
Below in conjunction with embodiment the present invention is detailed further.
As shown in Figure 1, automatic deicing control system of cooling tower fan comprises double-speed motor M, MCC switch board and PLC; Three-phase electrical source of power (alternating current 380V, phase line L1, L2, L3) is connected to double-speed motor M, and its power loop is equipped with current transformer Ta, Tc and Ta1, Tc1, and the corresponding cashier's office in a shop ammeter that is equipped with of MCC can show running current cashier's office in a shop at MCC.Electric Machine Control can be divided into the other and concentrated two kinds of control modes of machine, and the other control box of machine is installed in device context, moves through the button control motor on the control box; HMI is placed on the control room, through the operation of PLC control motor.
Three phase line L1 of three-phase electrical source of power, L2, L3 are divided into three the tunnel after through circuit breaker Q 01, and the first via is that contactor K01 often leaves main contact and is connected to double-speed motor M (earth connection PE, three- phase 1U, 1V, 1W), the control low cruise; The second the tunnel is that contactor K04 often leaves main contact and is connected to double-speed motor M (earth connection PE, three- phase 1U, 1V, 1W), the operation of control low speed and reverse; Third Road is controlled through K02 and two contactors of K03 and is realized; Contactor K02 often leaves main contact and is connected to double-speed motor M (earth connection PE; Three- phase 2U, 2V, 2W); The K03 contactor is closed simultaneously realizes that the motor internal wiring becomes Y-Y connection by delta connection, thereby realizes the high-speed cruising control of motor.
Be installed in current transformer Ta, Tc and Ta1 on the power loop, the Tc1 electric current after with conversion and send into electrothermal relay F01 thermal element, ammeter PA and electrothermal relay F02 thermal element, ammeter PA1 respectively, reach the purpose that overload protection and electric current show.
As shown in Figures 2 and 3; Two line traffic control power supply (alternating current 220V; Phase line L; Zero line N) is connected to the MCC switch board through circuit breaker Q 11, comprises low cruise control loop, low speed and reverse operation control loop, high-speed cruising control loop, winding switching controls loop, low speed SBR control loop, high speed SBR control loop, Fault Control loop, indicating fault control loop in the MCC switch board, stop to indicate control loop, low cruise to indicate control loop, low speed and reverse operation indication control loop and high-speed cruising indication control loop.
Be connected between two lines of two line traffic control power supplys:
Drawing a branch road between the button S3 of the band normally closed interlock in the low cruise control loop and the contact 5 of universal seclector S6 is connected to contactor K04 and often opens auxiliary contact; Draw the button S2 that a branch road is connected to the band normally open contact between the button S1 of the contact 2 of universal seclector S6 and band normally open contact; Draw a branch road between the contact 6 of universal seclector S6 and relay K 20 normally open contacts and be connected to relay K 21 normally open contacts; Again successively through the normally closed auxiliary contact of contactor K01, contactor K04 coil, control loop was moved as low speed and reverse in this loop after these three branch roads converged;
Draw a branch road between relay K 10 normally closed interlocks, the normally closed auxiliary contact of contactor K03; Be divided into three the tunnel behind the button S5 through relay K 12 normally open contacts, K24 normally closed interlock, band normally closed interlock successively again; One the tunnel is connected to contactor K02 often opens auxiliary contact; Another road is connected to the contact 7,8 of universal seclector S6 and the button S4 of band normally open contact successively; Third Road is connected to contact 11,12 and relay K 23 normally open contacts of universal seclector S6 successively, this three the tunnel converge after more successively through the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of contactor K04, contactor K02 coil, this loop is as the high-speed cruising control loop;
Button S5, the universal seclector S6 of the button S4 of the button S3 of the button S2 of the button S1 of band normally open contact, band normally open contact, band normally closed interlock, band normally open contact, band normally closed interlock are positioned at the execute-in-place case;
Draw a branch road between the normally closed auxiliary contact of contactor K04 of high-speed cruising control loop and the contactor K02 coil and be connected to contactor K03 coil, this loop is as winding switching controls loop;
Circuit breaker Q 01 auxiliary contact OF, electrothermal relay F01 normally closed interlock, relay K 11 coils of connecting successively, this loop is as the lower-speed state control loop;
Draw a branch road between the circuit breaker Q 01 auxiliary contact OF of lower-speed state control loop and the electrothermal relay F01 normally closed interlock, this branch road is connected to electrothermal relay F02 normally closed interlock, relay K 12 coils successively, and this loop is as the fast state control loop;
Circuit breaker Q 01 Alarm contactor SD, electrothermal relay F01 normally open contact, the electrothermal relay F02 normally open contact of parallel connection are connected to relay K 10 coils after these three branch roads converge again, and this loop is as the Fault Control loop;
The normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of K02, the normally closed auxiliary contact of K04 of series connection are connected to parallelly connected indicator lamp H1 and H2 then, and this loop is as stopping to indicate control loop;
Contactor K01 often leaves indicator lamp H2 and the H3 that auxiliary contact is connected to parallel connection, and control loop is indicated as low cruise in this loop;
Contactor K04 often leaves indicator lamp H3 and the H4 that auxiliary contact is connected to parallel connection, and this loop is as low speed and reverse operation indication control loop;
The contactor K02 of series connection often leaves auxiliary contact, K03 and often opens auxiliary contact, is connected to the indicator lamp H4 and the H5 of parallel connection again, and control loop is indicated as high-speed cruising in this loop;
Indicator lamp H1, H2, H3 and H4 are positioned at the execute-in-place case.
As shown in Figure 4, PLC comprises two modules (Siemens PLC C input/output module-ASI module) ASI1 and ASI2.NC1 among the figure～normally closed pin of 3 expressions, C1～3 expression common pin, pin, IN1～4 expression signal input pins are often opened in NO1～3 expressions.
The pin 14 and 15 of modules A SI1 is connected to relay K 20 coils; Pin 17 and 18 is connected to relay K 21 coils; Pin 19 and 20 is connected to relay K 22 coils, is connected to relay relay K 10 normally open contacts between the pin 2 and 8, is connected to contactor K01 between the pin 3 and 9 and often opens auxiliary contact; Be connected to contactor K04 between the pin 5 and 11 and often open auxiliary contact, the contactor K02 that is connected to series connection between the pin 6 and 12 often opens auxiliary contact, K03 and often opens auxiliary contact;
The pin 8 and 9 of modules A SI2 is connected to relay K 23 coils, and pin 10 and 11 is connected to relay K 24 coils, is connected to relay K 11 normally open contacts between the pin 5 and 2, is connected to relay K 12 normally open contacts between the pin 6 and 3.
As shown in Figure 5, the method for using of automatic deicing control system of cooling tower fan may further comprise the steps:
1) after the timer of PLC is accomplished the preparation of deicing, begins to detect the blower fan duty, be divided into high-speed cruising, low cruise and stop three kinds of states;
2) if high-speed cruising is then shut down and delayed time a period of time, get into next step then; If low cruise is then shut down and delayed time a period of time, get into next step then; If halted state then directly gets into next step;
3) said control system carries out the low speed and reverse deicing, continues to get into next step after a period of time;
4) said control system-down gets into next step after time-delay a period of time;
5) said control system is switched to former duty, begin next step then;
6) timer of PLC is waited for deicing next time, returns step 1).
Below its method for using further is detailed.
At first with circuit breaker Q 01, Q11 main contact closure, system's energising; Get into step 1) then;
The method of step 1) system high-speed operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact of universal seclector S6 11,12 is connected, with relay K 23 coil electricities of PLC modules A SI2, if must stop then relay K 24 coil electricities with PLC modules A SI2; The other method of operating of machine is: the contact 7,8 of universal seclector S6 connected, then will be closed with the button S4 of normally open contact, and if must stop then button S4 to be broken off, the shutdown delay time of high-speed cruising is 600s.
The method of system's low cruise is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact of universal seclector S6 5,6 is connected, with relay K 20 coil electricities of PLC modules A SI1, if must stop then relay K 22 coil electricities with PLC modules A SI1; The other method of operating of machine is: earlier the contact 1,3 of universal seclector S6 connected, again will be closed with the button S1 of normally open contact, and if must stop then button S1 to be broken off, the shutdown delay time of low cruise is 300s.
Step 2) method of low speed and reverse operation is divided into centralized operation and the other operation of machine; The method of centralized operation is: the contact of universal seclector S6 5,6 is connected, with relay K 21 energisings of PLC modules A SI1, if must stop then relay K 22 coil electricities with PLC modules A SI1; The other method of operating of machine is: the contact 1,2 of universal seclector S6 connected, and again that button S2 is closed, if must stop then button S2 to be broken off.
The duration of step 3) low speed and reverse deicing is 1800s.
It is 300s that step 4) is shut down delay time.
Claims (2)
1. automatic deicing control system of cooling tower fan, it is characterized in that: it comprises double-speed motor M, MCC switch board and PLC; The three-phase electrical source of power is connected to double-speed motor M, also is connected to the MCC switch board through current transformer on the powered wire between three-phase electrical source of power and the double-speed motor M, is connected to execute-in-place case and PLC on the MCC switch board;
Three phase line L1 of said three-phase electrical source of power, L2, L3 are divided into two-way after through circuit breaker Q 01; The contactor K01 of leading up to often opens main contact and is connected to double-speed motor M; Another road is often opened main contact through contactor K02 and is connected to double-speed motor M, also is connected to current transformer T on this two-way powered wire respectively
a, T
cAnd T
A1, T
C1, the two ends of contactor K01 are connected to the reverse contactor K04 of three-phase and often open main contact, and contactor K01 often leaves and also is connected to the contactor K03 that three-phase is connected together between main contact and the double-speed motor M and often opens main contact;
Said current transformer T
a, T
cBe connected to MCC switch board, T through electrothermal relay F01 thermal element, ammeter PA
A1, T
C1Be connected to the MCC switch board through electrothermal relay F02 thermal element, ammeter PA1;
Said two line traffic control power supplys are connected to the MCC switch board through circuit breaker Q 11, comprise low cruise control loop, low speed and reverse operation control loop, high-speed cruising control loop, winding switching controls loop, low speed SBR control loop, high speed SBR control loop, Fault Control loop, indicating fault control loop in the MCC switch board, stop to indicate control loop, low cruise to indicate control loop, low speed and reverse operation indication control loop and high-speed cruising indication control loop;
Be connected between two lines of said two line traffic control power supplys:
Relay K 10 normally closed interlocks, the normally closed auxiliary contact of contactor K03, relay K 11 normally open contacts, the K22 normally closed interlock of contacting successively; Be connected to the execute-in-place case then; At first be button S3, be divided into three the tunnel, the one tunnel then and be connected to contactor K01 and often open auxiliary contact through the band normally closed interlock; Another road is connected to the contact 1,2 of universal seclector S6 and the button S1 of band normally open contact; Third Road is connected to contact 5,6 and relay K 20 normally open contacts of universal seclector S6, this three the tunnel converge after more successively through the normally closed auxiliary contact of contactor K04, contactor K01 coil, this loop is as the low cruise control loop;
Drawing a branch road between the button S3 of the band normally closed interlock in the low cruise control loop and the contact 5 of universal seclector S6 is connected to contactor K04 and often opens auxiliary contact; Draw the button S2 that a branch road is connected to the band normally open contact between the button S1 of the contact 2 of universal seclector S6 and band normally open contact; Draw a branch road between the contact 6 of universal seclector S6 and relay K 20 normally open contacts and be connected to relay K 21 normally open contacts; Again successively through the normally closed auxiliary contact of contactor K01, contactor K04 coil, control loop was moved as low speed and reverse in this loop after these three branch roads converged;
Draw a branch road between relay K 10 normally closed interlocks, the normally closed auxiliary contact of contactor K03; Be divided into three the tunnel behind the button S5 through relay K 12 normally open contacts, K24 normally closed interlock, band normally closed interlock successively again; One the tunnel is connected to contactor K02 often opens auxiliary contact; Another road is connected to the contact 7,8 of universal seclector S6 and the button S4 of band normally open contact successively; Third Road is connected to contact 11,12 and relay K 23 normally open contacts of universal seclector S6 successively, this three the tunnel converge after more successively through the normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of contactor K04, contactor K02 coil, this loop is as the high-speed cruising control loop;
Button S5, the universal seclector S6 of the button S4 of the button S3 of the button S2 of the button S1 of band normally open contact, band normally open contact, band normally closed interlock, band normally open contact, band normally closed interlock are positioned at the execute-in-place case;
Draw a branch road between the normally closed auxiliary contact of contactor K04 of high-speed cruising control loop and the contactor K02 coil and be connected to contactor K03 coil, this loop is as winding switching controls loop;
Circuit breaker Q 01 auxiliary contact OF, electrothermal relay F01 normally closed interlock, relay K 11 coils of connecting successively, this loop is as the lower-speed state control loop;
Draw a branch road between the circuit breaker Q 01 auxiliary contact 0F of lower-speed state control loop and the electrothermal relay F01 normally closed interlock, this branch road is connected to electrothermal relay F02 normally closed interlock, relay K 12 coils successively, and this loop is as high speed SBR control loop;
Circuit breaker Q 01 Alarm contactor SD, electrothermal relay F01 normally open contact, the electrothermal relay F02 normally open contact of parallel connection are connected to relay K 10 coils after these three branch roads converge again, and this loop is as the Fault Control loop;
Relay K 10 normally open contacts, the indicator lamp H1 of series connection, this loop is as the indicating fault control loop;
The normally closed auxiliary contact of contactor K01, the normally closed auxiliary contact of K02, the normally closed auxiliary contact of K04 of series connection are connected to parallelly connected indicator lamp H1 and H2 then, and this loop is as stopping to indicate control loop;
Contactor K01 often leaves indicator lamp H2 and the H3 that auxiliary contact is connected to parallel connection, and control loop is indicated as low cruise in this loop;
Contactor K04 often leaves indicator lamp H3 and the H4 that auxiliary contact is connected to parallel connection, and this loop is as low speed and reverse operation indication control loop;
The contactor K02 of series connection often leaves auxiliary contact, K03 and often opens auxiliary contact, is connected to the indicator lamp H4 and the H5 of parallel connection again, and control loop is indicated as high-speed cruising in this loop;
Indicator lamp H1, H2, H3 and H4 are positioned at the execute-in-place case.
2. control according to claim 1 system, it is characterized in that: PLC comprises PLC input/output module ASI1 and ASI2;
The pin 14 and 15 of modules A SI1 is connected to relay K 20 coils; Pin 17 and 18 is connected to relay K 21 coils; Pin 19 and 20 is connected to relay K 22 coils, is connected to relay K 10 normally open contacts between the pin 2 and 8, is connected to contactor K01 between the pin 3 and 9 and often opens auxiliary contact; Be connected to contactor K04 between the pin 5 and 11 and often open auxiliary contact, the contactor K02 that is connected to series connection between the pin 6 and 12 often opens auxiliary contact, K03 and often opens auxiliary contact;
The pin 8 and 9 of modules A SI2 is connected to relay K 23 coils, and pin 10 and 11 is connected to relay K 24 coils, is connected to relay K 11 normally open contacts between the pin 5 and 2, is connected to relay K 12 normally open contacts between the pin 6 and 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102618760A CN101738134B (en) | 2009-12-31 | 2009-12-31 | Automatic deicing control system of cooling tower fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102618760A CN101738134B (en) | 2009-12-31 | 2009-12-31 | Automatic deicing control system of cooling tower fan |
Publications (2)
| Publication Number | Publication Date |
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| CN101738134A CN101738134A (en) | 2010-06-16 |
| CN101738134B true CN101738134B (en) | 2012-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102618760A Expired - Fee Related CN101738134B (en) | 2009-12-31 | 2009-12-31 | Automatic deicing control system of cooling tower fan |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608182B (en) * | 2020-12-03 | 2023-09-15 | 福建佰时德能源科技有限公司 | Cooling tower control method and control system |
Citations (6)
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|---|---|---|---|---|
| US4085594A (en) * | 1977-02-14 | 1978-04-25 | Suntech, Inc. | Control system for cooling tower fans |
| JP3194395B2 (en) * | 1992-05-18 | 2001-07-30 | 日本電信電話株式会社 | Path function sequential generation method |
| SG126678A1 (en) * | 2001-07-09 | 2006-11-29 | Chi-Yi Wang | A cooling tower for automatically adjusting flow rates of cooling water and cooling air with variations of a load |
| CN101403582A (en) * | 2008-11-14 | 2009-04-08 | 沪东重机有限公司 | Automatic temperature control apparatus of large cooling column group |
| CN201318765Y (en) * | 2008-09-18 | 2009-09-30 | 日滔贸易（上海）有限公司 | Modeling apparatus for working conditions of cooling tower of refrigeration system of central air conditioner |
| CN201348464Y (en) * | 2008-12-31 | 2009-11-18 | 冠城大通股份有限公司 | Temperature control device of cooling water |
-
2009
- 2009-12-31 CN CN2009102618760A patent/CN101738134B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085594A (en) * | 1977-02-14 | 1978-04-25 | Suntech, Inc. | Control system for cooling tower fans |
| JP3194395B2 (en) * | 1992-05-18 | 2001-07-30 | 日本電信電話株式会社 | Path function sequential generation method |
| SG126678A1 (en) * | 2001-07-09 | 2006-11-29 | Chi-Yi Wang | A cooling tower for automatically adjusting flow rates of cooling water and cooling air with variations of a load |
| CN201318765Y (en) * | 2008-09-18 | 2009-09-30 | 日滔贸易（上海）有限公司 | Modeling apparatus for working conditions of cooling tower of refrigeration system of central air conditioner |
| CN101403582A (en) * | 2008-11-14 | 2009-04-08 | 沪东重机有限公司 | Automatic temperature control apparatus of large cooling column group |
| CN201348464Y (en) * | 2008-12-31 | 2009-11-18 | 冠城大通股份有限公司 | Temperature control device of cooling water |
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| CN101738134A (en) | 2010-06-16 |
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