ABSTRACT
ABSTRACT
Building the conservation-oriented society, the reasonable development, saves and the
effective protecting water resources is an arduous task. Be centralized according to the university
water used time, the water consumption change major characteristic, analyzed the campus
original water supply system existence cost to be high, the reliability was low, the water
resources waste, the pipe network system treated the consummation the question. Proposed that
draws water the way which using the running water hydraulic pressure water supply and the
water pump unifies, and matches by the inverter, the soft starter, PLC, Micro reveals the
compensator, the pressure transmitter, the fluid position sensor and so on. according to the
network management pressure, controls water pump's rotational speed through the inverter,
causes in water pipe's pressure maintains at throughout the appropriate scope, thus may solve the
problem which the floor high pressure is too insufficient when small current capacity the energy
consumption is big.
Moreover the water pump consumes the electric power and the electrical machinery rotational
speed is proportional three cubed the relations, therefore the water pump velocity modulation
movement's energy conservation effect is obvious, the average power consumption usual water
supply way saves 40%.The union uses the programmable controller, may realize the main pump
frequency conversion, the auxiliary pump soft start, has the short circuit protection, the overflow
protection function stably, the work reliable, lengthened electrical machinery's service life
greatly.
Key words: Constant pressure frequency conversion water supply, PLC, differential
pressure water supply, automatic control
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