Ventilation and air conditioning system, fan before the general will set a normally open electric fire-proof valve, when the fire valve fuse when closed, linkage to turn off the fan, avoid fan continue to run in the air after the closure, to protect the blower function. Subway ventilation and air conditioning system is more complex, the linkage function normally open fire valve electric fan and different system each are not identical.
Metro Engineering normally open electric fire-proof valve
Subway engineering often open electric fire-proof valve has two kinds: one kind uses the FF1 number, is a normal open electric smoke fire damper, the normal state of normally open, electric operation, electric or manual reset, 70 ° C fuse closing fire valve, used to send, the exhaust pipe; another by FP1 number, is normally open electric smoke fire damper, the normal state of normally open, electric operation, electric or manual reset, 280 ° C fuse closing fire valve, used for exhaust pipe or exhaust air and exhaust pipe. Differences between two kinds of fireproof valve is fusing temperature fuse different.
Principles of subway engineering normally open electric fire-proof valve
Normally open state of the output terminal electric fire-proof valve has 3: open state signal (A), off state signal (C) and a common terminal (B). Fireproof valve operation principle of the device is shown in figure 1.
Normal circumstances, fire valve remains open, public end (B) and open state signal output end (A) between the conduction, control system determine the fire valve in the open position; when the fire occurs, smoke (temperature) are fire probe signal, control system output DC24V power supply to the fire valve electromagnet, the solenoid is energized, the connecting piece of the operating mechanism on the hook and the pawl pawl disengaged, and the blade shaft are fixed together, the blade in the valve spring force effect under closed quickly; when fusing temperature of air temperature in pipeline to fuse, fusible film fuse, fuse rod under the action of the pressure spring quickly opened, this spring I lose tension, in the spring under the action of a Ⅱ hook and disengaged, blade quickly shut down. At the same time, fireproof valve electric or blown off, the spindle is rotated 90 degrees the tablet, micro switch release, cut off the A-B DT power circuit, electromagnet, the micro switch B-C is turned on, the valve closed signal output. Because the power off signal and fuse valve closed signal through the same set of terminal of the output, the control system must by logic programming to distinguish the fire valve closed signal fuse.
Realization of normally open fire valve electric fan and the linkage function
Small ventilation system
Figure 2 is the T1 small ventilation system in a station of the schematic diagram and operation control table. Process XPF-I1 fan and often open electric smoke fire damper T1/FP1-1 in normal ventilation and fire operation are open, also asked the fire mode, when the T1/FP1-1 fuse is closed, shut down the wind turbine XPF-I1 linkage.
Figure 3 is the linkage control flow ventilation and smoke exhaust fan and damper. When performing fire mode, by loading program, judge whether T1/FP1-1 continued close, when receiving the fire valve position signal, the control system sends out the air command, in order to realize the fire damper fuse close linkage function of fans.
The normally open fire valve electric fan and the linkage function is relatively simple, because the fire valve and the blower one one corresponding, thus realize the function may be appropriate to optimize. When the fire valve fuse is closed, the linkage function realization process through the following procedures: control cables fuse will fire valve closed signal is sent to the remote control system of I/O module box, a module box will master PLC the signals sent to the control room is located in the central control over a communication network, PLC program after the judgment output off fan signal, signal through the Ethernet interface to the loop control linkage PLC within the cabinet, linkage PLC close fan command; as to the hardwired interlocks, only through the following process: control cables fuse will fire valve closed signal is sent to the loop control electric control linkage PLC cabinet, linkage PLC Executive to turn off the fan command. Through the above analysis, the intermediate links hardwired interlocking less, accordingly, the fault point can also be reduced, which can improve the reliability of the linkage function.
Air conditioning and ventilation system
Figure 4 is the K1 air conditioning and ventilation system of a station of the schematic diagram and operation control table. The new wind air-conditioning technology requirements, XXF-I1 and K1/FF1-1 linkage, linkage between XK-I1 and K1/FF1-3, valve open fan, fan valve closed; the rest condition, XHPF-I1 and K1/DT-1 linkage, linkage between XK-I1 and K1/FF1-2, valve open fan, fan valve closed. The linkage function is complex, there are many operating under normal circumstances (ventilation operation, small air conditioning operation, new wind air-conditioning), a fan (XK-I1) in different conditions and different fire valve (K1/FF1-2, K1/FF1-3) linkage, must realize through the procedure.
This system can also be optimized. See the figure 1 normally open fire valve electric operating device schematic, operating device with opening and closing action of 2 springs in the fire valve. The system is in normal working condition also need to often open fire valve electric operating, metal fatigue, frequent operation will cause the spring day in and day out the damage, greatly reduce the life of the fire valve, can appear even when the fire fire valve is damaged, not against, the exhaust function. Therefore, suggestions of ventilation system to increase 220V electric control valve in the design of each fire valve, to achieve functional linkage with the fan by the electric control valve.
The station system
Figure 5 is a station system diagram and table control operation excerpt. Technological requirements when TK/FP1-I1, TK/FP1-I2 any smoke fire damper in fire conditions fuse is closed, close HPF-I1, HPF-I2, KT-I1, KT-I2.
The station system, the normally open fire valve electric fuse linkage closed fan of logic programming with the small ventilation system is similar, just because the fan and the fire valve is not one one corresponding, and a variety of fire mode, operation and judgment of the fire valve slightly different. The station public area of fire, close the damper TK/FP1-I2, and load the program continues to judge whether the TK/FP1-I1 is closed; station public area of fire, close the damper TK/FP1-I1, and load the program continues to judge whether the TK/FP1-I2 is closed; when receiving the need to fire valve procedures to determine the position signal, the control system sends out HPF-I1, HPF-I2, KT-I1, the KT-I2 command to realize the fire damper fuse linkage closed fan function.
Because the station system existence of normally open type electric fire valve through the program closed fire mode, and fireproof valve through the program closes with a fuse closed off in place by the same group of output terminals, hard line and therefore cannot refer to small ventilation system of interlocking optimization scheme, to improve the reliability of the functional linkage. Of course, if the manufacturer can improve the manufacturing process of the fire valve fire valve, so that it can provide a set of independent fuse closed signal output terminal, can control loop of the signal access linkage fan interlock function of hard line.
Conclusion
Aiming at 3 typical system of subway ventilation and air conditioning engineering specialty, this paper describes in detail the design and optimization of the normally open fire valve electric fan and the linkage function. When the fire valve linkage with the fan uses a pair of manner, the control system can achieve the function of easy; when the fire valve and fan linkage with one to many or many of the complex mode, control system to realize the function will also become more complex, even may be affected by fire valve products limited or programming language restrictions, linkage machine can not judge the control requirements. At the same time, should avoid the frequent operation of normally open electric fire-proof valve.
Through the analysis, the hope can make the ventilation process designers know more, the control system of the development train of thought, combined with the ventilation process itself, or a better linkage control scheme, make contribution to the optimization of the subway system.
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