CN210005914U - double-frequency-conversion automatic control system of non-negative-pressure water supply equipment - Google Patents

Abstract

The utility model discloses a two frequency conversion automatic control systems of no negative pressure water supply equipment, including PLC, PLC is connected with the control circuit of interlocking, the PID regulator of converter, pressure transmitter and stationary flow jar, and the PID regulator of control circuit of interlocking and converter is connected with the contactor group, is equipped with a plurality of manometers between pressure transmitter and the stationary flow jar, and the contactor group connects the water pump, automatic control system, including three-phase power L1, L2, L3, three-phase power L1, L2, L3 are connected with circuit breaker QF1 end, circuit breaker QF1 other end is connected with circuit breaker QF2 and circuit breaker QF3, is equipped with the voltmeter between circuit breaker QF1 and the circuit breaker QF3, have following advantage that the water pump group can directly be in higher efficiency intervals operation, open and stop when equipment and realize soft stop completely, compare single frequency conversion control can better energy-conservation, reduce the impact of the undulant of pressure and pipe network to equipment.

Description

double-frequency-conversion automatic control system of non-negative-pressure water supply equipment

Technical Field

The utility model discloses a kind do not have negative pressure water supply equipment's two frequency conversion automatic control system belongs to electronic control technical field.

Background

The secondary water supply facility is mainly set up for making up for the insufficient pressure of a municipal water supply pipeline and ensuring that people living in high-rise people use water, compared with raw water supply, the safety and reliability of secondary water supply are directly concerned by of citizens, the traditional secondary water supply equipment adopts a single system for supplying water, a water outlet pressure detection meter of a water supply network collects the pressure of a water outlet of the water supply network and sends the pressure to a controller, the controller compares the received water outlet pressure value of the water supply network with a preset user water pressure value, the frequency of a variable frequency speed regulator is adjusted according to the difference value of the two values, so that the rotating speed of a pressurized water pump is adjusted, the automatic constant pressure of the water supply system is stabilized at a set pressure value, namely when the water outlet pressure value of the water supply network is smaller than the set user water pressure value, the controller controls the variable frequency speed regulator to increase the frequency and accelerate the rotating speed of the water pump, so that the whole user pipe network has sufficient water pressure at any time and is equal to the pressure value set by the user, when the water outlet pressure value of the water supply network is larger than the set user water pressure value, the set pressure value, the controller controls the variable frequency speed regulator to stop.

The existing water supply system has the following defects:

1. the automatic energy optimization function is not available;

2. the whole unit can not be operated at a high-efficiency point, and the energy consumption is high;

3. the water pump needs to be started and stopped frequently, so that the service life of the pump is shortened, and electric energy is wasted;

4. the automatic sleep and wake-up functions are not provided;

5. the automatic cutting function of the fault water pump is not provided.

And as shown in fig. 1, when water pumps of the original single-frequency-conversion non-negative-pressure control system run at full frequency still not enough to meet the water demand of a user, the equipment needs to start a second water pump, and at this time, problems occur, namely, the th water pump runs at the right end of an efficiency curve and has low efficiency, and the second water pump runs at the left end of the efficiency curve and has lower efficiency, so that the energy-saving effect of the whole set of unit is not good enough.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to above not enough, kinds of no negative pressure water supply equipment's two frequency conversion automatic control system is provided, the water pump package can directly be in higher efficiency interval operations, the equipment opens and stops to have realized soft stopping completely when opening, compare the energy-conservation that single frequency conversion control can be better, reduce the fluctuation of pressure and the impact of pipe network to equipment, converters are all configured to every water pump, and the automatic energy optimization function of configuration, adopt real-time parameter curve tracking system.

For solving the technical problem, the utility model discloses a following technical scheme:

kinds of double-frequency conversion automatic control system without negative pressure water supply equipment, including PLC, PLC is connected with the control circuit of interlocking, the PID regulator of converter, pressure transmitter and stationary flow jar, and the PID regulator of control circuit of interlocking and converter is connected with the contactor group, is equipped with a plurality of manometers between pressure transmitter and the stationary flow jar, and the contactor group connects the water pump.

The automatic control system comprises three-phase power L1, L2 and L3, wherein the three-phase power L1, L2 and L3 are connected with a breaker QF1 end, the other end of the breaker QF1 is connected with a breaker QF2 and a breaker QF3, and a voltmeter is arranged between the breaker QF1 and the breaker QF 3.

, the other end of the circuit breaker QF2 and the other end of the circuit breaker QF3 are both connected with ends of frequency converters, the other ends of the two frequency converters are respectively connected with an RJ1 end and an RJ2 end of a thermal protector, an ammeter PA1 is arranged between the circuit breaker QF2 and the thermal protector RJ1, an ammeter PA2 is arranged between the circuit breaker QF3 and the thermal protector RJ2, the other end of the thermal protector RJ1 is connected with a motor M1, and the other end of the thermal protector RJ2 is connected with a motor M2.

And step , the PLC comprises a RELAY OUTPUTS module, a MAC ADDRESS ELAN module, a 24VDCINPUTS module, a 120-loop 240VAC module, an ANALOG INPUTES module, an ANALOG OUTPUTS module and an RS 485X 20 module, a pin 2L of the RELAY OUTPUTS module is connected with a 24V + power supply, a pin DOa.4 of the RELAY OUTPUTS module is connected with a coil end of a RELAY FX-6, a coil other of the RELAY FX-6 is connected with a 24V-power supply, a pin DOa.5 of the RELAY OUTPUTS module is connected with a coil end of a RELAY HZ-4, a pin of the RELAY HZ-4 is connected with a 24V-power supply, a pin DOa.6 of the RELAY OUTPUTS module is connected with a coil end of a RELAY FA-5, a pin of the RELAY-5 is connected with a 24V-power supply, a pin DOA.7 of the RELAY OUTPUTS module is connected with a pin 2, a pin 2 of the DOLAY OUTPUTS module is used for controlling a frequency converter coil 462, a pin of the frequency converter OUTPUTS module is connected with a frequency converter, a frequency converter OUTPUTS module is connected with a frequency converter OUTPUTS 2# 2, a frequency converter # 2 is connected with a frequency converter, a frequency converter # 2# 462 # inverter # 2# inverter module for controlling a frequency converter module, a frequency converter # 2# 1, a frequency converter for controlling a frequency converter # 2.

, connecting the pin 0M of the ANALOG output module with the pin AGND1 of the frequency converter, and connecting the pin 0 of the ANALOG output module with the pin AI1 of the frequency converter for controlling the frequency setting of the frequency converter;

the L + foot of the ANALOG INPUTES module is connected with a 24V + power supply, the M foot of the ANALOG INPUTES module is connected with a 24V-power supply, the 0+ foot of the ANALOG INPUTES module is used for inputting inlet pressure, the 0-foot of the ANALOG INPUTES module is connected with a 24V-power supply, the 1+ foot of the ANALOG INPUTES module is used for inputting outlet pressure, the 1-foot of the ANALOG INPUTES module is used for inputting 24V-power supply, the 2+ foot of the ANALOG INPUTES module is used for inputting flow, the 2-foot of the ANALOG INPUTES module is connected with AI-L-, the 3+ foot of the ANALOG INPUTES module is connected with an AI-WD power supply, the inlet pressure at the municipal pressure equipment is used as the inlet pressure of the municipal pressure equipment, and the outlet pressure is used as the pressure of the municipal pressure equipment, the flow rate is the water supply to the municipal inflow facility.

, the 1M pin of the MAC ADDRESS ELAN module is connected to a 24V-power supply, the DIa.0 pin of the MAC ADDRESS ELAN module is used for 1# current control, the DIa.1 pin of the MAC ADDRESS ELAN module is used for 2# current control, the DIa.3 pin of the MACADDRESS ELAN module is used for voltage control, the DIa.4 pin of the MAC ADDRESS ELAN module is connected to a resistor R7 end, the other pin of the resistor R7 is connected to a 24V + power supply, and the DIa.5 pin of the MAC ADDRESS ELAN module is used for frequency conversion fault control.

In , a dib.0 pin of the 24VDC input module is connected with a knob terminal, another terminal of the knob is connected with a 24V + power supply, a dib.1 pin of the 24VDC input module is connected with a thermal protector RJ1 terminal, another terminal of the thermal protector RJ1 is connected with the 24V + power supply, a thermal protector RJ1 is used for performing overheat protection of the 1# motor, a dib.2 pin of the 24VDC input module is connected with a thermal protector RJ2 terminal, another terminal of the thermal protector RJ2 is connected with the 24V + power supply, a thermal protector RJ2 is used for performing overheat protection of the 2# motor, a dib.6 pin of the 24VDC input module is connected with a YW-HING, a dib.7 pin of the 24VDC input module is connected with a terminal of a normally open contact of a STOP-1, another terminal of the normally open contact of the relay STOP-1 is connected with the 24V + power supply for emergency control, a DIc.0 pin of the 24VDC input module is connected with a high relay contact of a water tank relay, a high relay is connected with a water level control relay 369624V + relay, and a fault control relay is connected with a high relay 369634 terminal of a water level relay.

The automatic control system further comprises a fuse FU, the end of the fuse FU is connected with a phase L-A of a power supply A, the other 0 end of the fuse FU is connected with a1 end of a normally closed relay KA contact, a2 end of a normally open relay KA contact and a 3 end of a knob, the other 4 end of the knob is connected with a 5 end of a relay KA coil, the 6 end of the relay KA coil is connected with a power zero line, the other 7 end of the normally closed relay KA contact is connected with an 8 end of a normally closed relay KM contact, the 9 end of a relay 1# VF-3 contact, the VO-4 contact end of the relay 2# KM normally closed contact, the 0 end of a relay KM normally closed contact, the other 1 end of the normally closed relay KM normally closed contact is connected with a2 end of a relay 1# VO-2 contact, the other 3 end of the relay 1# VO-2 contact is connected with a 4 end of a relay KM coil, the other 5 end of the relay KM coil is connected with a thermal protector RJ-6 end, the other 7 end of the thermal protector KA end is connected with a normally closed relay KM coil, the normally closed relay KM coil is connected with a normally closed contact, the normally closed relay KM coil, the KM coil is connected with a relay KM coil, the normally closed contact of the relay KM coil of the relay KM normally closed contact of the relay KM coil of the relay 4 normally closed contact of the relay 4 coil of the relay 4 normally closed contact of the relay 4 coil of the relay KM;

the automatic control system further comprises a fuse FU2, the end of the fuse FU2 is connected with a power supply phase L1-A, the other end of the fuse FU2 is connected with a switch SB4 0 end, a 1 end of the temperature controller 1 and a socket end, the other end of the switch SB4 is connected with a lamp end, the other end of the lamp is connected with the power supply neutral line 1, the other end of the temperature controller 1 is connected with a fan end, the other end of the fan is connected with the power supply neutral line 1, and the other end of the socket is connected with the power supply neutral line.

, the automatic control system further includes a 24V power module, an L pin of the 24V power module is connected to an L1 pin of a 120-plus 240VAC module in the PLC, an N pin of the 24V power module is connected to an N pin of the 120-plus 240VAC module in the PLC, the L pin and the N pin of the 24V power module are connected to a filter end, another end of the filter is connected to an L1-a line and an N line, another end of the filter is connected to a microbreak end, another end of the microbreak is connected to a phase L1-a of the power supply a and to a microbreak 2 end, another end of the microbreak is connected to an L-DB line, a + V pin of the 24V power module is connected to a 24V + pin, and an FU3 end, another end of the fuse FU3 is connected to a 24V + pin of the GPRS, the 24V pin of the 24V power module is connected to a 24V-pin, and the 2 pin of the GPRS and the RS 485.

, the automatic control system further includes a touch screen SMART, a 24V + pin of the touch screen SMART is connected to a 24V + power supply, a 24V-pin of the touch screen SMART is connected to a 24V-power supply, the automatic control system further includes a voltage sensing input PV, a 9 pin of the voltage sensing input PV is connected to a resistor R3 terminal and a dia.3 pin of a MAC ADDRESS ELAN module in the PLC, another terminal of the resistor R3 is connected to the 24V + power supply, an 8 pin and a 6 pin of the voltage sensing input PV are connected to the 24-power supply, a 5 pin of the voltage sensing input PV is connected to the 24+ power supply, a 3 pin of the voltage sensing input PV is connected to a power supply B phase L2-B, a1 pin of the voltage sensing input PV is connected to a power supply C phase L3-C, the automatic control system further includes PI1 and PI2, a 9 pin of the PI1 is connected to a resistor R1 terminal and a 630 pin of a resistor R2 terminal, a 9 pin of the PLC and a resistor MAC ADDRESS ELAN, another resistor R24 a 24V + 23 terminal of the PLC module.

, the automatic control system further comprises a relay FY and a relay CY, wherein the end of the coil of the relay FY is connected with a 24V-power supply, the other end of the coil of the relay FY is connected with a negative voltage fault input FY-IN, the end of the coil of the relay CY is connected with the 24V-power supply, and the other end of the coil of the relay CY is connected with an overvoltage fault input CY-IN;

the automatic control system further comprises a relay KA1, the end of a normally open contact of the relay KA1 is connected with a variable-frequency 24V power supply 24V-MA, the other end of the normally open contact of the relay KA1 is connected with a 24V power supply 24V-DB without a terminal, the end of a normally closed contact of the relay KA1 is connected with 24V +, the other end of the normally closed contact of the relay KA1 is connected with the 24V power supply 24V-DB without a terminal, the end of the normally closed contact of the relay KA1 is connected with an outlet pressure input AI-OUT1, the end of the normally open contact of the relay is connected with an emergency analog quantity AI-MA, the end of the normally open contact of the relay is connected with the outlet pressure.

The utility model adopts the above technical scheme, compare with prior art, have following technological effect:

1. at present, double-frequency-conversion control is adopted, after the right side of the highest point of the efficiency of the water pump is reached, the second water pump is started, so that the pump set is directly operated in higher efficiency intervals, soft start and soft stop are completely realized when the equipment is started and stopped, and pressure fluctuation and impact of a pipe network on the equipment are reduced.

2. The system disclosed by the patent allocates frequency converters for each water pump of the equipment, and allocates an automatic energy optimization function;

when the equipment is started, the frequency converter controls the water pump to start the th variable frequency pump from the set lowest frequency, the equipment calculates the required pressure, adjusts the frequency output, and compensates the difference, if the water consumption of the user is increased, the output frequency is increased, when the water pump frequency reaches the switching frequency (the switching frequency is not 50HZ, and the switching frequency needs to be calculated according to the specific water pump parameters in detail), the real-time parameter curve tracking system sends a control signal to the PLC, the PLC starts the next variable frequency pumps after obtaining an instruction, when the second water pump is put into operation formally, the th water pump starts to reduce the frequency, then the two water pumps run at the same frequency, the efficiency of the whole water pump unit is ensured to be the highest, the water consumption of the user is continuously increased, and the third water pump is started in the same mode.

3. A real-time parameter curve tracking system is adopted, and the original pressure of tap water is fully utilized to save energy;

the equipment utilizes the characteristics that the water pump can superpose the pressure of intaking, adopts real-time parameter curve tracking system adjustment technique, according to user's pressure setting value automatic judgement pressure difference value, how much the difference is compensated, make full use of municipal pipe network's original 2 ~ 3 kilograms of pressure, so the model selection of pump will be less than ordinary frequency conversion equipment power partially, can effectual energy saving.

4. A small-flow shutdown pressure maintaining function;

when the water consumption of a user is less or no water is used by the user (such as at night), the equipment automatically enters a low-flow shutdown pressure-maintaining energy-saving state, the normal water supply during low flow is met by utilizing the water quantity and energy stored in the air pressure tank, and the water pump does not need to be frequently started and stopped, so that the service life of the pump is prolonged, and the electric energy is saved.

5. Automatic 'sleep' and 'wake-up' functions;

when the water stored in the municipal water supply cut-off and stability regulator is used up, the equipment enters a shutdown protection state and gives an alarm for prompt; when the water quantity meets the starting condition, the equipment is automatically started and operated in a variable frequency mode; when the water consumption of a user pipe network is very small or zero, the equipment automatically starts a small-flow pressure maintaining state, the water pump is dormant, and the equipment achieves the purpose of energy conservation through the functions.

6. Multivariate fuzzy control technology;

the equipment constantly detects the running state of the equipment, dynamically and automatically adapts to automatic adjustment according to the simulation curve of the water consumption change of each water point, the optimized running efficiency is kept, the energy-saving effect is greatly improved, the running cost of the equipment is obviously reduced, and the energy is saved by more than 15 percent compared with the traditional variable frequency control technology;

7. the automatic cutting function of the fault water pump is realized;

when a water pump in the water pump unit fails, the micro-control system can automatically discriminate, automatically remove the failed water pump, start other standby water pumps, and alarm to inform related personnel, so that the energy consumption is prevented from being increased due to the operation of the failed water pump.

The present invention will be described in detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a comparison graph of the operating efficiency curves of the water pump in the double frequency conversion control and the single frequency conversion control of the present invention;

fig. 2 is a schematic block diagram of a dual-frequency-conversion automatic control system in an embodiment of the present invention;

fig. 3 to 5 are schematic diagrams of a dual-frequency-conversion automatic control system according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the communication function of the dual-frequency conversion automatic control system in the embodiment of the present invention;

fig. 7 is a schematic diagram of an implementation method of the dual-frequency conversion automatic control system in the embodiment of the present invention.

Detailed Description

Embodiment 1, as shown in fig. 2 to 5, kinds of double-frequency-conversion automatic control systems without negative pressure water supply equipment comprise a PLC, the PLC is connected with an interlocking control circuit, a PID regulator of a frequency converter, a pressure transmitter and a current stabilization tank, the interlocking control circuit and the PID regulator of the frequency converter are connected with a contact set, a plurality of pressure gauges are arranged between the pressure transmitter and the current stabilization tank, and the contact set is connected with a water pump.

The automatic control system comprises three-phase power L1, L1 and L1, the three-phase power L1, the L1 and the L1 are connected with a circuit breaker QF1 end, the other 1 end of the circuit breaker QF1 is connected with a circuit breaker QF1 end and a circuit breaker QF1 end, a voltmeter is arranged between the circuit breaker QF1 and the circuit breaker QF1, the other 1 end of the circuit breaker QF1 and the other 1 end of the circuit breaker QF1 are both connected with 1 ends of frequency converters, the other 1 ends of the two frequency converters are respectively connected with an RJ1 end of a thermal protector and an RJ1 end, an ammeter PA1 is arranged between the circuit breaker QF1 and the RJ1, the other 1 end of the thermal protector is connected with a motor M1, and the other 1 end of the thermal protector is connected with a motor M.

The double-frequency-conversion automatic control system further comprises a PLC, the PLC adopts west sub S7-200, the PLC comprises a RELAYOUTPUTS module, a MAC ADDRESS ELAN module, a 24VDC INPUTS module, a 120-VAC 240VAC module, an ANALOGINPUTS module, an ANALOG OUTPUTS module and an RS 485X 20 module, a 2L pin of the RELAY OUTPUTS module is connected with a 24V + power supply, a DOa.4 pin of the RELAY OUTPUTS module is connected with a coil end of a RELAY FX-6, a coil of the RELAY FX-6 is connected with a 24V-power supply, a DOa.5 pin of the RELAY OUTPUTS module is connected with a coil end of a RELAY HZ-4, a coil of the RELAY HZ-4 is connected with a 24V-power supply, a DOa.6 pin of the RELAY OUTPUTS module is connected with a coil end of a RELAY-5, a coil 6324V-power supply, a coil 7372 pin of the RELAY HZ-4 is connected with a coil 632V-5, a pin of the RELAY OUTPUTS module is connected with a reset module, a pin of the frequency converter OUTPUTS module is connected with a frequency converter OUTPUTS module, a pin of a frequency converter OUTPUTS 1, a frequency converter is connected with a frequency converter OUTPUTS 18B, a frequency converter coil 462, a frequency converter control module is connected with a frequency converter control module, a frequency converter control module is connected with a frequency converter control module, a frequency converter frequency.

A pin 0M of the ANALOG OUTPUTS module is connected with a pin AGND1 of the 1# frequency converter, a pin 0 of the ANALOG OUTPUTS module is connected with a pin AI1 of the 1# frequency converter and used for controlling the set frequency of the 1# frequency converter, a pin 1M of the ANALOG OUTPUTS module is connected with a pin AGND1 of the 2# frequency converter, and a pin 0 of the ANALOG OUTPUTS module is connected with a pin AI1 of the 2# frequency converter and used for controlling the set frequency of the 2# frequency converter.

The L + foot of the ANALOG INPUTES module is connected with a 24V + power supply, the M foot of the ANALOG INPUTES module is connected with a 24V-power supply, the 0+ foot of the ANALOG INPUTES module is used for inputting inlet pressure, the 0-foot of the ANALOG INPUTES module is connected with a 24V-power supply, the 1+ foot of the ANALOG INPUTES module is used for inputting outlet pressure, the 1-foot of the ANALOG INPUTES module is used for inputting 24V-power supply, the 2+ foot of the ANALOG INPUTES module is used for inputting flow, the 1+ foot of the ANALOG INPUTES module is used for inputting outlet pressure, the inlet pressure is the municipal pressure at the inlet of the device, the outlet pressure is the outlet pressure after the device is pressurized, and the flow is the water supply flowing into the device.

The 1M pin of the MAC ADDRESS ELAN module is connected with a 24V-power supply, the DIa.3 pin of the MAC ADDRESS ELAN module is used for voltage control, the DIa.4 pin of the MAC ADDRESS ELAN module is connected with a resistor R7 end, the resistor R7 is connected with a end to be connected with a 24V + power supply, and the DIa.5 pin and the DIa.6 pin of the MAC ADDRESS ELAN module are used for frequency conversion fault control.

A dib.0 pin of the 24VDC INPUTS module is connected with a knob end, another end of the knob is connected with a 24V + power supply, a dib.1 pin of the 24VDC INPUTS module is connected with a thermal protector RJ1 end and an emergency 1# knob end, another end of the thermal protector RJ1 and another end of the emergency 1# knob are connected with a 24V + power supply, a thermal protector RJ1 is used for carrying out thermal protection on the 1# frequency converter, a dib.2 pin of the 24VDCINPUTS module is connected with a thermal protector RJ2 end and an emergency 2# knob end, another end of the thermal protector RJ 59629 and another end of the emergency 2# knob are connected with a 24V + power supply, a thermal protector RJ2 is used for carrying out thermal protection on the 2# frequency converter, a dib.7 pin of the 24VDC INPUTS module is connected with a end of a normally open contact of a relay STOP-1, another 8 end of the normally open contact of the relay is connected with a 24V + power supply, a DIB.0 pin for emergency STOP control, a DIV contact of the 24VDC contact, a DIV contact is connected with a high-voltage control relay end of a DIV contact control water tank, a DIV contact of a DIV contact control relay 356 contact, and a DIV contact of a DIV contact, wherein a DIV contact.

The automatic control system further comprises a relay KA, the coil of the relay KA is connected with a power supply zero line, the other end of the coil of the relay KA is connected with a knob 0 end, the other end 1 of the knob is connected with an L-DC power line, the other end 2 of the contact of the relay KA is connected with an L-DC power line, the other end 3 of the contact of the relay KA is connected with an emergency 1# knob 4 end and an emergency 2# knob 5 end, the other end 6 of the emergency 1# knob is connected with a 7 end of a coil of a relay 1# VF-2, the other end 8 of the coil of the relay 1# VF-2 is connected with an RJ 9 end of a thermal protector, the other end of the thermal protector RJ is connected with a 0 end of a normally closed contact of the relay STOP-1, the other end 1 of the normally closed contact of the relay STOP-1 is connected with a power supply, the other end 2 end of the coil of the emergency 2# VF-3 is connected with a 3 end of a relay 2# VF-3 coil protector, the other end 4 of the relay 2# VF-3 coil protector is connected with a hot RJ 5 end, the other end of the RJ 6 end of the normally closed contact of the STOP-1 end of the relay STOP-1 is connected with a 7 end of the normally closed contact of the relay STOP-1, the power supply zero line is connected with a power supply zero line of the relay, the L end.

The automatic control system further comprises a fuse FU2, the end of the fuse FU2 is connected with an L1-A power line, the other end of the fuse FU2 is connected with a switch SB4 0 end, a 1 end of a relay FX-6 contact and a socket end, the other end of the switch SB4 is connected with a lamp end, the other end of the lamp is connected with a power supply neutral line 1, the other end of the relay FX-6 contact is connected with a fan end, the other end of the fan is connected with the power supply neutral line 1, and the other end of the socket is connected with the power.

The automatic control system further comprises a power module PS207, an L pin of the power module PS207 is connected with an L1 pin of a 120-plus-240 VAC module in the PLC, an N pin of the power module PS207 is connected with an N pin of the 120-plus-240 VAC module in the PLC, the L pin and the N pin of the power module PS207 are connected with a filter end, another end of the filter is connected with an L-DC line and an N line, another end of the filter is connected with a micro-break end, another end of the micro-break is connected with a power supply A phase L1-A and is connected with a micro-break 2 end, another end of the micro-break 2 end is connected with an L-DB line, a + V pin of the power module PS207 is connected with a 24V + pin and is connected with a FU3 end, another end of the fuse FU3 is connected with a 24V + pin of the GPRS, the + V pin of the power module PS207 is connected with a 24V-.

The automatic control system further comprises a touch screen SMART, a 24V + pin of the touch screen SMART is connected with a 24V + power supply, a 24V-pin of the touch screen SMART is connected with a 24V-power supply, the automatic control system further comprises a voltage sensing input PV, a 9 pin of the voltage sensing input PV is connected with a resistor R3 end, the other end of the resistor R3 is connected with the 24V + power supply, an 8 pin and a 6 pin of the voltage sensing input PV are connected with the 24-power supply, a 5 pin of the voltage sensing input PV is connected with the 24V + power supply, a 3 pin of the voltage sensing input PV is connected with a power supply B phase L2-B, a1 pin of the voltage sensing input PV is connected with a power supply C phase L3-C, an end of a relay FY coil is connected with the 24V-power supply, the other end of the relay FY coil is connected with a negative voltage fault input FY-IN, an end of the relay CY coil is connected with the 24V-power.

The normally open contact end of the relay KA1 is connected with 24V-MA, the other end of the normally open contact of the relay KA1 is connected with 24V-DB, the normally closed contact end of the relay KA1 is connected with 24V +, the other end of the normally closed contact of the relay KA1 is connected with 24V-DB, the normally closed contact end of the relay KA1 is connected with an outlet pressure input AI-OUT1, the normally open contact end of the relay is connected with an emergency analog quantity AI-MA, the normally open contact end of the relay is connected with an outlet pressure input AI-OUT, and a 24V power supply is connected with a resistor R5 end.

of the normally OPEN contact of the relay FA-5 is connected with the CLOSE-1, of the normally closed contact of the relay FA-5 is connected with the OPEN-1, the other of the normally OPEN contact of the relay FA-5 and the other of the normally closed contact of the relay FA-5 are connected with the L-DB, the CLOSE-1 represents the closing of the electric valve, the OPEN-1 represents the opening of the electric valve, and the L-DB represents the terminal power supply.

The method includes the steps of firstly, interlocking power frequency and frequency conversion operation contactors of main pump motors, strictly prohibiting the output ends of frequency converters from being connected to a power frequency power supply, secondly, configuring the frequency converters according to the capacity of a single motor, interlocking the frequency conversion operation modes of the motors, thirdly, realizing the isolation between strong current and weak current between a PLC output terminal and an alternating current contactor coil through an intermediate relay, adopting photoelectric isolation in a communication loop, and arranging a thermal relay, an air switch and the like in a main circuit for motor protection.

The system is mainly used for maintenance, debugging and PLC fault operation, the remote manual control is that the remote control of the water pump operation is realized through the communication of a computer and a PLC, the system switches the water supply state of the water pump according to the principle of 'starting and stopping firstly', the water pumps are ensured to run in a balanced mode and are mutually standby in a fixed time period, the water delivery pumps have independent control functions and are mutually standby in the functional design of the control system, and the standby pump can be automatically put into operation when the working pump fails, and can realize arbitrary combination interlocking control in the automatic control mode and also can be independently controlled in the manual control mode.

1. PID control loop

When the water supply equipment starts to work, the frequency conversion pump is started first, when the water pressure of a pipe network reaches a set value, the output frequency of the frequency conversion pump is stabilized on a value specified by , and when the water consumption is increased and the water pressure is reduced, a sensor sends signals to the PID loop regulator, the PID loop regulator sends signals which are increased compared with the water consumption, so that the output frequency of the frequency conversion pump is increased, the rotating speed of the water pump is increased, the water pressure is increased, variable or double-constant-pressure water supply can be realized according to actual needs, when the equipment is started, the frequency conversion controller controls the water pump to start a third frequency conversion pump from the set lowest frequency, the equipment calculates the required pressure, adjusts the frequency output, the difference is compensated, the output frequency of the frequency conversion pump reaches the maximum power frequency, when the power frequency of the frequency conversion pump reaches the power frequency, the power frequency of the frequency conversion pump reaches the power frequency of a set frequency of a PLC, and the PLC calculates 3550 frequency of the water pump, and when the frequency of the water pump reaches the frequency of the frequency conversion pump reaches the set value, the frequency of a frequency conversion pump, the PLC controller starts to switch-frequency of the water pump, and the PLC starts to switch the water pump, and the water pump to the water pump starts to the water pump, and the water pump starts to start the PLC, and then starts to start the water pump, and the PLC, and the water pump, and the PLC starts to start the PLC, and the water pump, and the PLC starts the water pump, and the PLC starts to start the water pump, and the water.

2. Sleep function

When the system is operated, the situation that the water consumption of a user is small or the water is not used (such as at night) is often met, in order to save energy, the system is provided with a sleep function which can enable the water pump to pause to work, when the equipment detects that the water consumption is very small, the equipment can pressurize to fixed pressure set values according to instructions, then the frequency converter stops working, the water pump stops (is in a sleep state), when the water pressure of the user is reduced, the system restarts, and if the starting times of the pump exceed the set values within period of time, the system quits the sleep.

3. Communication function

The system has the communication function with the computer, the PLC is provided with 485 interfaces, the monitoring computer can communicate with or more systems, the computer can be used for monitoring all the running states of the equipment, including specific parameters such as current, voltage, running frequency of each water pump, rotating speed, municipal pressure of tap water, actual water supply pressure of the equipment and the like, and also can control and adjust various parameters of the system.

The system is mainly completed through a GPRS DTU and a GPRS network of a mobile company. The DTU mainly completes the tasks of transmitting and forwarding the data of the PLC or RTU and a scheduling center, and is also a working interface with a mobile GPRS network. The whole water supply remote monitoring system is composed of three parts as shown in figure 6: the system comprises a field control part, a GPRS data transmission part and a scheduling room data center. And finishing data interaction with a GPRS DTU (short for DTU) through a control module. The DTU collects data to the controller at regular time, and meanwhile, the controller receives the data sent by the DTU in real time to complete corresponding control functions. The DTU immediately forwards the data sent by the controller to the data center.

(1) The field water supply equipment controller can adopt various controllers including S7-200 and the like, and the DTU collects various process parameters in real time and sends the data to the DTU communication module through the RS-232 serial port communication module; meanwhile, the command of the dispatching center can be received through the communication module.

(2) The data transmission part inputs the fixed IP address of the data center, the data acquisition command, the acquisition time interval and other necessary parameters in advance when the DTU communication module is configured, and simultaneously, related parameters can also be set remotely, after the DTU communication module receives the data sent by the controller, the data is sent to the IP address network server arranged in front and is forwarded to the data center server through port mapping, the DTU sends the data in the process that the data is sent to the China Mobile GPRS network, then passes through the Internet, and finally is received by the server accessed to a special line or a broadband dial network in the data center, and the receiving server completes series work such as data processing, library writing, forwarding and the like.

(3) The dispatching room data center is connected with the Internet, and the receiving server receives data from each water supply device through the Internet and analyzes and controls the data.

4. Automatic setting of water outlet pressure

The pressure loss of the water distribution pipe network is different along with the change of the water supply amount, the larger the water supply amount is, the larger the pressure loss is, in order to achieve the purposes of meeting the requirements of users on the stability of water pressure and realizing energy conservation and consumption reduction, the fuzzy control method is adopted to automatically set the water outlet pressure according to the water outlet amount and the water outlet pressure value, on the basis of constant pressure, if the system is not provided with a flowmeter, the approximate flow can be estimated in the system according to the running condition of a pump, the water outlet pressure is automatically adjusted according to the flow, and complete variable pressure transformation is realized.

The fuzzy control method is that the equipment detects the self running state at any time, and the dynamic change of the equipment automatically adapts to automatic adjustment according to the simulation curve of the water consumption change of each water point, so that the optimized running efficiency is kept, the energy-saving effect is greatly improved, the running cost of the equipment is obviously reduced, and the energy is saved by more than 15 percent compared with the traditional variable frequency control technology.

5. Remote alarm function

The design of the equipment is based on the principle of unattended operation, the equipment with failure of can automatically dial the preset telephone to inform the maintenance personnel, reduce the processing time of the failure and ensure the continuity of water supply, the equipment can set 3 groups of alarm telephone numbers, if the equipment can not be led into the telephone line, a mobile or connected GSM network can be adopted, and the function can be realized only in the place with the signal.

As shown in fig. 7, the implementation method of double-frequency-conversion automatic control systems of non-negative-pressure water supply equipment includes the following steps:

step S101, starting work, and entering step S102 after the work is finished;

step S102, initializing the system, and entering step S103 after the system is initialized;

step S103, monitoring whether remote control is needed, if so, starting a remote control module, and continuously monitoring whether remote control is needed, and if not, entering step S104;

step S104, monitoring whether the water level is insufficient, if so, starting the water level insufficient processing module, returning to the step S103, and if not, entering the step S105;

step S105, monitoring whether the frequency converter fails, starting the automatic power frequency operation module if the frequency converter fails, returning to execute the step S103, and entering step S106 if the frequency converter does not fail;

step S106, whether the motor fails or not is monitored, if the motor fails, auxiliary pump two-main-pump running modules are started, the step S103 is executed in a returning mode, and if the motor does not fail, the step S107 is executed;

step S107, automatically adjusting the frequency under the current running state, and entering step S108 after the frequency is adjusted;

step S108, whether the switching condition is met or not is judged, if the switching condition is not met, the step S103 is executed, otherwise, the step S109 is executed;

step S109, determining overpressure or underpressure, if overpressure or underpressure is present, increasing the state transition model of the main pump, and returning to step S103, and if overpressure is present, decreasing the state transition model of the main pump, and returning to step S103.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. The dual-frequency-conversion automatic control system of the kinds of non-negative-pressure water supply equipment is characterized by comprising a PLC (programmable logic controller), wherein the PLC is connected with an interlocking control circuit, a PID (proportion integration differentiation) regulator of a frequency converter, a pressure transmitter and a steady flow tank, the interlocking control circuit and the PID regulator of the frequency converter are connected with a contactor group, a plurality of pressure gauges are arranged between the pressure transmitter and the steady flow tank, and the contactor group is connected with a water pump;

   the automatic control system comprises three-phase power L1, L2 and L3, wherein the three-phase power L1, L2 and L3 are connected with a breaker QF1 end, the other end of the breaker QF1 is connected with a breaker QF2 and a breaker QF3, and a voltmeter is arranged between the breaker QF1 and the breaker QF 3.
2. 2. The kind of automatic control system of double-frequency conversion without negative pressure water supply equipment as claimed in claim 1, wherein the other terminal of the breaker QF2 and the other terminal of the breaker QF3 are both connected with terminal of the frequency converter, the other terminals of the two frequency converters are respectively connected with RJ1 terminal of the thermal protector and RJ2 terminal of the thermal protector, a current meter PA1 is arranged between the breaker QF2 and the RJ1 terminal of the thermal protector, a current meter PA2 is arranged between the breaker QF3 and the RJ2 terminal of the thermal protector, the other terminal of the thermal protector RJ1 is connected with the motor M1, and the other terminal of the thermal protector RJ2 is connected with the motor M2.
3. 3. The double-frequency-conversion automatic control system of kinds of non-negative-pressure water supply equipment as claimed in claim 1, characterized in that the PLC comprises a RELAY OUTPUTS module, a MAC ADDRESS ELAN module, a 24VDC INPUTS module, a 120-5 VAC module, an ANALOG INPUTS module, an ANALOG OUTPUTS module and an RS 485X 20 module, wherein a 24V + power supply is connected to a 2L pin of the RELAY OUTPUTS module, a coil end of a RELAY FX-6 is connected to a DOa 4 pin of the RELAY OUTPUTS module, a coil end of a RELAY HZ-4 is connected to a DOa.5 pin of the RELAY OUTPUTS module, a 24V-power supply is connected to the coil pin of the RELAY HZ-4, a coil end of the RELAY HFA-5 is connected to the DOA.6 pin of the RELAY OUTPUTS module, a coil 4624V-24 pin of the RELAY HZ-4 is connected to a power supply, a coil 6 pin of the RELAY OUTPUTS module is connected to a coil end of the RELAY, a coil 5392-5 is connected to a coil 462 pin of the RELAY, a frequency converter coil 13 is connected to a frequency converter module, a frequency converter module 2 pin of the frequency converter module, a frequency converter is connected to a frequency converter module, a frequency converter module is connected to a frequency converter module 2 and a frequency converter module, a module is connected to a frequency converter module.
4. 4. The dual-frequency-conversion automatic control system of kinds of non-negative-pressure water supply equipment according to claim 3, wherein the foot 0M of the ANALOG output module is connected with the foot AGND1 of the frequency converter, and the foot 0 of the ANALOG output module is connected with the foot AI1 of the frequency converter for controlling the frequency setting of the frequency converter;

   the L + foot of the ANALOG INPUTES module is connected with 24V + power supply, the M foot of the ANALOG INPUTES module is connected with 24V-power supply, the 0+ foot of the ANALOG INPUTES module is used for inputting inlet pressure, the 0-foot of the ANALOG INPUTES module is connected with 24V-power supply, the 1+ foot of the ANALOG INPUTES module is used for inputting outlet pressure, the 1-foot of the ANALOG INPUTES module is connected with 24V-power supply, the 2+ foot of the ANALOG INPUTES module is used for inputting flow, the 2-foot of the ANALOG INPUTES module is connected with AI-L-, the 3+ foot of the ANALOG INPUTES module is connected with AI-WD, the 3-foot of the ANALOG INPUTES module is connected with 24V-power supply, wherein the inlet pressure at the municipal pressure and the outlet pressure is the pressure after the pressurization of the municipal pressure, the flow rate is the water supply to the municipal inflow facility.
5. 5. The dual-frequency-conversion automatic control system of kinds of non-negative-pressure water supply equipment, as claimed in claim 3, wherein the 1M pin of MAC ADDRESS ELAN module is connected to 24V-power, the DIa.0 pin of MAC ADDRESS ELAN module is used for 1# current control, the DIa.1 pin of MAC ADDRESS ELAN module is used for 2# current control, the DIa.3 pin of MAC ADDRESS ELAN module is used for voltage control, the DIa.4 pin of MAC ADDRESS ELAN module is connected to R7 terminal, the R7 terminal is connected to 24V + power in addition to terminal, and the DIa.5 pin of MAC ADDRESS ELAN module is used for frequency-conversion fault control.
6. 6. The dual-frequency-conversion automatic control system of kinds of non-negative-pressure water supply equipment as claimed in claim 3, wherein a DIb.0 pin of the 24VDC INPUTS module is connected with a knob terminal, another terminal of the knob is connected with a 24V + power supply, a DIb.1 pin of the 24VDC INPUTS module is connected with a RJ1 terminal of a thermal protector, another terminal of the RJ1 thermal protector is connected with a 24V + power supply, an RJ1 thermal protector is used for overheat protection of a 1# motor, a DIb.2 pin of the 24VDC INPUTS module is connected with a RJ2 terminal, another terminal of the thermal protector is connected with a 24V + power supply, a RJ2 thermal protector is used for overheat protection of the 2# motor, a DIb.6 pin of the 24VDC INPUTS module is connected with a YW-HING, a DIb.7 pin of the 24VDC INPUTS module is connected with an terminal of a normally open contact of a relay STOP-1, a terminal of the normally open contact terminal of the normally open relay is connected with a 24V + power supply, another terminal of the 24V power supply is connected with a 24V power supply, a 24V contact, a high-voltage control relay is connected with a DIB.6 terminal of a DIV contact, a DIB.8V contact terminal of a DIV contact, a DIV contact point of a VDC control tank is connected with a DIF relay, a high-control relay, a DI.
7. 7. The double-frequency-conversion automatic control system of the non-negative-pressure water supply equipment as claimed in claim 3, wherein the automatic control system further comprises a fuse FU1, a fuse FU1 end is connected with a power supply a phase L1-a, another 0 end of the fuse FU1 is connected with a 1 end of a normally closed contact of a relay KA1, a 2 end of a normally open contact of a relay KA1 and a knob 3 end, another 4 end of the knob is connected with a coil 5 end of a relay KA1, a 6 end of a coil KA1 of the relay KA1 is connected with a power zero line, another 1 end of a normally closed contact of the relay KA1 is connected with a normally closed contact of a relay KM1, a1 end of a normally closed contact of a normally closed relay 1# 1, a normally closed contact of a relay 1# VF-3 VF-1, another contactor KM1 is connected with a normally closed contact of a normally closed relay KM1, another constant closed contact of a normally closed relay 1# 1, a normally closed relay KM1, a normally closed relay # 1, a normally closed contact of a normally closed relay # 1, a normally closed relay # 363 # 1 is connected with a normally closed contact of a normally closed relay # 1, a normally closed contact of a normally closed relay # 1, a normally closed relay # 363 # 1, a normally closed relay # 1, a normally closed contact of a normally closed relay # 363 # 1 and a normally closed relay # 1, a normally closed relay # 363 # 1 is connected with a normally closed relay # 1, a normally closed contact of a normally closed relay # 1, a normally closed relay # 36 # 1, a normally closed relay # 363 # 1, a normally closed relay # 1 and a normally closed relay # 1, a normally closed contact of a normally closed relay # 1, a1 and a normally closed relay # 363 # 1, a normally closed relay #;

   the fuse FU1 is further connected with a knob SB1 end, the other end of the knob SB1 is connected with the end of a relay STOP-1 coil, the other end of the relay STOP-1 coil is connected with a power supply zero line, the power supply zero line is connected with the end of an indicator light L1, the other end of the indicator light L1 is connected with the end of a relay FAU contact, and the other end of the relay FAU contact is connected with the fuse FU 1;

   the automatic control system further comprises a fuse FU2, the end of the fuse FU2 is connected with a power supply phase L1-A, the other end of the fuse FU2 is connected with a switch SB4 0 end, a 1 end of the temperature controller 1 and a socket end, the other end of the switch SB4 is connected with a lamp end, the other end of the lamp is connected with the power supply neutral line 1, the other end of the temperature controller 1 is connected with a fan end, the other end of the fan is connected with the power supply neutral line 1, and the other end of the socket is connected with the power supply neutral.
8. 8. The double-frequency-conversion automatic control system of kinds of non-negative-pressure water supply equipment as claimed in claim 1, characterized in that the automatic control system further comprises a 24V power module, the L pin of the 24V power module is connected with the L1 pin of the 120-plus 240VAC module in the PLC, the N pin of the 24V power module is connected with the N pin of the 120-plus 240VAC module in the PLC, the L pin and the N pin of the 24V power module are connected with a filter end, the other end of the filter is connected with the L1-A line and the N line, the other end of the filter is connected with a micro-break end, the other end of the micro-break is connected with the power A phase L1-A and is connected with a micro-break 2 end, the other end of the micro-break is connected with the L-DB line, the + V pin of the 24V power module is connected with 24V +, and is connected with the FU3 end, the FU3 end end is connected with the 24V + pin of the GPRS, the + V pin of the 24V power module is connected with the GPRS 463.
9. 9. The double-frequency-conversion automatic control system for non-negative-pressure water supply equipment according to claim 1, wherein the automatic control system further comprises a touch screen SMART, a 24V + pin of the touch screen SMART is connected with a 24V + power supply, a 24V-pin of the touch screen SMART is connected with a 24V-power supply, the automatic control system further comprises a voltage sensing input PV, a 9 pin of the voltage sensing input PV is connected with a resistor R3 end and a DIa.3 pin of a PLC MAC ADDRESS ELAN module, another end of the resistor R3 is connected with a 24V + power supply, an 8 pin and a 6 pin of the voltage sensing input PV are connected with the 24-power supply, a 5 pin of the voltage sensing input PV is connected with the 24+ power supply, a 3 pin of the voltage sensing input PV is connected with a power supply B phase L2-B, a1 pin of the voltage sensing input PV is connected with a power supply C phase L3-C, the automatic control system further comprises PI1 and PI2, a 9 pin of PI1 is connected with a1 end and a pin of a PLC MAC ADDRESS ELAN a pin of a PLC module, a pin of a PI 638R, a pin 5823 and another resistor R638 pin of a PLC module.
10. 10. The double-frequency-conversion automatic control system of non-negative-pressure water supply equipment as claimed IN claim 1, further comprising a relay FY and a relay CY, wherein the end of the coil of the relay FY is connected with a 24V-power supply, the other end of the coil of the relay FY is connected with a negative-pressure fault input FY-IN, the end of the coil of the relay CY is connected with a 24V-power supply, and the other end of the coil of the relay CY is connected with an overvoltage fault input CY-IN;

    the automatic control system further comprises a relay KA1, the end of a normally open contact of the relay KA1 is connected with a variable-frequency 24V power supply 24V-MA, the other end of the normally open contact of the relay KA1 is connected with a 24V power supply 24V-DB without a terminal, the end of a normally closed contact of the relay KA1 is connected with 24V +, the other end of the normally closed contact of the relay KA1 is connected with the 24V power supply 24V-DB without a terminal, the end of the normally closed contact of the relay KA1 is connected with an outlet pressure input AI-OUT1, the end of the normally open contact of the relay is connected with an emergency analog quantity AI-MA, the end of the normally open contact of the relay is connected with the outlet pressure.

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