A kind of microcomputer controlled variable-frequency speed-regulating water supply system
The present invention is a kind of by micro-processor controlled variable-frequency speed-regulating water supply system.
Variable-frequency speed-regulating water supply system is advanced method in the local water supply in present city, mainly can be divided into two classes; The one main device is by water pump assembly, pressure sensor, and microcomputerized controller and variable-frequency governor are formed.Microcomputerized controller is equipped with single-chip microcomputer or single board computer, and its effect is that the pressure signal that the signal of pressure sensor is set together by the program of prior layout is compared, and exports the output frequency of certain signal controlling variable-frequency governor then, with control adjustable speed water pump revolution.Its two water supply installation is by water pump assembly, pressure sensor, and water pump start or stop controller and variable-frequency governor are formed.Be provided with the PID signal conditioner in the water pump start or stop controller in this class device, its effect is a frequency of the certain signal of signal conversion output of pressure sensor being controlled frequency converter, to regulate the water pump revolution.This class device is compared with last class control device, because of control system does not have microcomputer device, thereby the normal pressure that can't realize and set relatively, the approach of its pressure signal control frequency converter is by the normal pressure of setting is exported to the signal value of frequency converter when the water pump maximum supplies water by pressure sensor, make the output signal of frequency converter reach the frequency maximum value, when incorporating constant speed parallel connection of pumps operation into, opening and closing by relay of water pump controlled.The characteristics of above-mentioned this two classes variable-frequency speed-regulating water supply system all are to make its change discharge of pump reach the variable constant pressure water supply by changing the water pump revolution.But it is this according to exit of pump changes in flow rate speed governing constant pressure water supply system, owing to its outlet pressure designs during high water usage amount when supplying water, therefore in the overwhelming majority times, supplying water, it is rich a lot of to export out the flowing water head, the adjustable range of frequency modulator makes power consumption higher only at 20～25HZ.This two classes water system is not considered the influence of storage of water situation to supplying water in the pond in addition, makes water deficiency in the storage cistern (the water level face is low excessively) sometimes, and water pump still moves, and causes last shutdown.
The purpose of this invention is to provide a kind of by micro-processor controlled variable-frequency speed-regulating water supply system, he can overcome the deficiency of existing frequency modulation water supply device, make water supply flow pressure and water flow pressure be tending towards identical substantially, and water pump is moved in efficient district scope to greatest extent, reach the reduction power consumption.In addition, this cover system is followed the tracks of control to the water level of storage cistern, can effectively avoid accident.
For realizing that the present invention not only considers the operation condition of water pump but also considered the operating working conditions change of pipeline in system's design, change present method according to exit of pump changes in flow rate speed governing constant pressure water supply, adopt the outlet of supplying water to be transformation, and water supply least favorable point (far) is a constant voltage, make water supply flow pressure curve and water flow-pressure diagram basic identical, near the operation of system under the energy-conservation perfect condition, the schematic diagram of this system such as Fig. 1.Among the figure: 1, microcomputer; 2, variable-frequency governor; 3, reduced-voltage starting device; 4, adjustable speed water pump; 5, constant speed water pump; 6, pressure sensor; 7, flow transmitter; 8, level sensor; 9, storage cistern; 10,11,12, valve (or one way valve).A connects urban water supply network or other water source; B connects the subscriber's outlet pipeline.In water system of the present invention shown in Figure 1, microcomputer 1 is a control centre; Variable-frequency governor and reduced-voltage starting device are the control actuating unit, the instruction after the MICROCOMPUTER PROCESSING changed into carry out signal output, and microcomputer 1, variable-frequency governor 2 and reduced-voltage starting device 3 are the instrument control portion in the system of the present invention; Pressure sensor 6, flow transmitter 7 and level sensor 8 are the checkout gear that is installed on the exit of pump pipeline and storage cistern is interior, these three sensors are with the pipeline water delivery flow, pressure and storage cistern water storage water level signal are sent in the microcomputer 1 to be handled, last adjustable speed water pump 4 and constant speed water pump 5 are water pump assembly, adjustable speed water pump is subjected to Frequency Converter Control, and the constant speed water pump is by the control of reduced-voltage starting device, and the water pump assembly operation is controlled automatically by electric control cabinet.Be of the present inventionly a kind ofly to comprise instrument control portion, checkout gear and water pump assembly by micro-processor controlled variable-frequency speed-regulating water supply system, it is characterized in that in the said checkout gear except that pressure sensor 6, still comprise flow transmitter 7 and level sensor 8, flow transmitter 7 is connected on the exit of pump pipeline and connects in user's the output channel, and flow transmitter 7 is that a universal measurement fluid flow is taken into account and will be recorded the sensor that changes in flow rate is transformed into the signal of telecommunication; Level sensor 8 is installed in the storage cistern 9, also is the sensor of general detection pondage.In the water system of the present invention owing to designed such three sensors, can detect the water storage situation that goes out streamflow and pressure and storage cistern in the water system, and signal is input to microcomputer handles, judge pipeline water delivery and water pump operation operating mode, according to giving the working procedure of importing earlier in the microcomputer 1, the instruction frequency converter is adjusted frequency, and changes starting or stoping of pump operating condition or instruction reduced-voltage starting device 3 control constant speed pumps 5, reaches whole water supply Automatic Optimal control.
Fig. 1 is an example of microcomputer controlled variable-frequency speed-regulating water supply system of the present invention.With regard to the device in its system, on former microcomputer controlled variable-frequency speed-regulating water supply system basis, on the exit of pump pipeline, be in series with flow transmitter 7, and in storage cistern, be placed with level sensor 8, promptly constitute the device part of system of the present invention.Owing to have pressure sensor 6 and flow transmitter 7 in this system, thereby the flow and the pressure that can detect the outlet of supplying water simultaneously utilize these two parameters to go control, it is basic identical that water supply flow pressure and water flow pressure are changed, the outlet of supplying water is transformation, therefore makes the adjustable range of frequency modulator increase and can reach about 40HZ.In addition, level sensor 8 is arranged in the storage cistern, can detect the water storage situation at any time and avoid accident, reduce power consumption effectively.