CN114922254A

CN114922254A - Automatic switching non-negative pressure water supply system and implementation method thereof

Info

Publication number: CN114922254A
Application number: CN202210650699.0A
Authority: CN
Inventors: 陈倩倩; 宋长广; 刘晴
Original assignee: Shandong Huali Water Supply Equipment Co ltd
Current assignee: Shandong Huali Water Supply Equipment Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-08-19
Anticipated expiration: 2042-06-09
Also published as: CN114922254B

Abstract

The application discloses automatic no negative pressure water supply system who switches, including main power source module, auxiliary relay module, PLC module and motor drive module, main power source module provides power for this system, and the auxiliary relay module provides the control circuit of this system, and the PLC module is the control core of this system, is the place of sending out of output and input instruction, also is the center of network conversion, and motor drive module is the drive information acquisition mechanism of this system. Has the following advantages: the system adopts a Siemens PLC control system, is also provided with a serial port network switching port module and a central control computer, can be connected with an external internet and a mobile phone communication network, can realize the operation of monitoring and controlling equipment out of an equipment site, and can realize quick response and treatment when the equipment operates abnormally.

Description

Automatic switching non-negative pressure water supply system and implementation method thereof

Technical Field

The invention discloses an automatic switching non-negative pressure water supply system and an implementation method thereof, belonging to the technical field of automatic control.

Background

At present, a current non-negative pressure water supply system is generally provided with a steady flow tank or a water tank which is arranged between a pressurizing pump set and a tap water pipe network so as to prevent the phenomenon of water inlet and water cut-off caused by direct pumping from the tap water pipe network by a pressurizing pump, which is a novel secondary water supply technology generated in recent years and a secondary water supply mode of directly pressurizing on the basis of the pressure of a water supply pipe network.

For example, in 07/01/2022, a non-negative pressure water supply device with publication number CN215442167 is disclosed, which comprises a base, a surge tank, a constant pressure tank and a pump set, wherein the surge tank is arranged on a support on the base, and a water outlet pipe is arranged at the bottom of the surge tank; the constant pressure tank is positioned above the pressure stabilizing tank and is communicated with the pressure stabilizing tank; including a plurality of water pumps in the pump package, the water pump is installed on the base and distribute the both sides of surge tank, just the water inlet of water pump with go out water piping connection, effectively reduced no negative pressure water supply equipment's area, thereby can effectively reduce the utility model discloses no negative pressure water supply equipment's use cost, this utility model though solved no negative pressure water supply and practice thrift the purpose of cost, still have certain defect.

1. The problem that the equipment can not realize water supply without negative pressure when the municipal water supply pressure is low or temporarily no water exists cannot be solved.

2. Remote networking and monitoring cannot be realized, timely monitoring and processing cannot be realized when equipment fails or is abnormal, and the method is not suitable for social requirements at the high-degree networking today.

Disclosure of Invention

The system is provided with a water storage tank, can realize automatic switching between municipal water supply and the water storage tank, ensures uninterrupted water supply of equipment, adopts a Siemens PLC control system, is also provided with a serial port switching port module and a central control computer, can be connected with an external internet and a mobile phone communication network, can realize that the operation of the equipment can be monitored and controlled when the equipment is not in an equipment site, and can realize quick response and treatment when the equipment is in abnormal operation.

In order to solve the technical problems, the invention adopts the following technical scheme:

an automatically-switched non-negative-pressure water supply system comprises a main power supply module, an intermediate relay module, a PLC module and a motor driving module, wherein the main power supply module provides a power supply for the system, the intermediate relay module provides a control loop of the system, the PLC module is a control core of the system, is a place for sending output and input instructions and is also a center of network conversion, and the motor driving module is a driving information acquisition mechanism of the system;

the PLC module comprises a CPU unit U1, a 232 serial port of the CPU unit U1 is connected with a touch screen serial port, the part is used for communication between the CPU unit U1 and the touch screen and can transmit data and instructions of the system to the touch screen, a 485 serial port of the CPU unit U1 is connected with a serial port-to-network port module, the serial port-to-network port module is connected with a central control computer, the part is used for communication between the CPU unit U1 and the central control computer and can transmit the data and the instructions of the system to the central control computer;

the L + pin and the M pin of the CPU unit U1 are connected with a +24V wire and a 0V wire, the part is used for a power supply of the CPU unit U1, the M pin, the 1M pin and the 2M pin of the CPU unit U1 are connected with a 0V wire, the L pin, the 1L pin and the 2L pin of the CPU unit U1 are connected with a +24V wire, the part is used for common connection of all control pins of the CPU unit U1, one end of a Q0.0 pin of an output end of the CPU unit U1 is connected with one end of an intermediate relay KA1 coil, the other end of the intermediate relay KA1 coil is connected with a 0V wire, the part is used for controlling the operation of a 1# water pump motor, one end of a Q0.1 pin of an output end of the CPU unit U1 is connected with one end of an intermediate relay KA2 coil, the other end of the intermediate relay KA2 coil is connected with a 0V wire, the part is used for controlling the operation of a 2# water pump motor, one end of a Q0.2 pin 3 coil of an output end of the CPU unit U1, the other end of the coil of the intermediate relay KA3 is connected with a 0V wire, the part is used for controlling the operation of a No. 3 water pump motor, one end of a Q0.3 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA4, the other end of the coil of the intermediate relay KA4 is connected with a 0V wire, the part is used for controlling the opening of a No. 1 pneumatic valve, one end of a Q0.4 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA5, the other end of a coil of the intermediate relay KA5 is connected with a 0V wire, the part is used for controlling the opening of a No. 2 pneumatic valve, one end of a Q0.5 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA6, the other end of a coil of the intermediate relay KA6 is connected with a 0V wire, the part is used for controlling the opening of a No. 3 pneumatic valve, one end of a Q0.6 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA7, and the other end of the coil of the intermediate relay 7 is connected with a 0V wire, the part is used for controlling the opening of a 4# pneumatic valve, one end of a Q0.7 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA8, the other end of the coil of the intermediate relay KA8 is connected with a 0V wire, the part is used for controlling the opening of a 5# pneumatic valve, one end of a Q1.0 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA9, the other end of the coil of an intermediate relay KA9 is connected with a 0V wire, and the part is used for controlling the opening of a 6# pneumatic valve.

Further, the main power module comprises a three-phase power supply R line, an S line, a T line and an N line, wherein the three-phase power supply R line, the S line, the T line and the N line are connected with one end of a breaker QF1, the other end of the breaker QF1 is connected with a three-phase power supply L1 line, an L2 line, an L3 line and an N line, the three-phase power supply L1 line, the L2 line and the L3 line are connected with one end of a breaker QF2, the other end of the breaker QF2 is connected with one end of a 1# water pump motor frequency converter T1, the other end of the 1# water pump motor frequency converter T1 is connected with one end of a thermal relay RJ1, and the other end of the thermal relay RJ1 is connected with a 1# water pump motor M1, and the three ends are used for driving the 1# water pump motor M1 to operate and thermally protect;

the three-phase power supply line L1, the line L2 and the line L3 are connected with one end of a breaker QF3, the other end of the breaker QF3 is connected with one end of a 2# water pump motor frequency converter T2, the other end of the 2# water pump motor frequency converter T2 is connected with one end of a thermal relay RJ2, the other end of the thermal relay RJ2 is connected with a 2# water pump motor M2, and the three-phase power supply line L1, the line L2 and the line L3 are used for driving the 2# water pump motor M1 to operate and thermally protect;

the three-phase power supply comprises a three-phase power supply line L1, a three-phase power supply line L2 and a three-phase power supply line L3, wherein one end of a breaker QF4 is connected with the other end of the breaker QF4, one end of a 3# water pump motor frequency converter T3 is connected with the other end of the 3# water pump motor frequency converter T3, one end of a thermal relay RJ3 is connected with the other end of the thermal relay RJ3, and the other end of the thermal relay RJ3 is connected with a 3# water pump motor M3 which is used for driving a 3# water pump motor M3 to operate and perform thermal protection;

the three-phase power supply L1 line and the N line are connected with one end of a breaker QF5, the other end of the breaker QF5 is connected with one end of a switch power supply, the other end of the switch power supply is connected with a +24V line and a 0V line, the +24V line and the 0V line are connected with one end of a touch screen and one end of a serial port-to-network port, and the part is used for supplying power to one end of the touch screen and the serial port-to-network port and also supplying power to other electrical appliances by direct current 24V.

Further, the intermediate relay module comprises an intermediate relay KA4 normally open contact, one end of the normally open contact of the intermediate relay KA4 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA4 is connected with one end of a solenoid valve YV1, the other end of the solenoid valve YV1 is connected with a 0V line, the intermediate relay module is used for controlling the No. 1 pneumatic valve, the normally open contact of the intermediate relay KA5 is further comprised, one end of the normally open contact of the intermediate relay KA5 is connected with the +24V line, the other end of the normally open contact of the intermediate relay KA5 is connected with one end of a solenoid valve YV2, the other end of the solenoid valve YV2 is connected with a 0V line, the part is used for controlling the No. 2 pneumatic valve, the intermediate relay module comprises an intermediate relay KA6 normally open contact, one end of the normally open contact of the intermediate relay KA6 is connected with the +24V line, the other end of the normally open contact of the intermediate relay KA6 is connected with one end of a solenoid valve YV3, the other end of the solenoid valve YV3 is connected with a 0V line, the part is used for controlling a 3# pneumatic valve, the intermediate relay module comprises an intermediate relay KA7 normally open contact, one end of the intermediate relay KA7 normally open contact is connected with a +24V line, the other end of the intermediate relay KA7 normally open contact is connected with one end of a solenoid valve YV4, the other end of the solenoid valve YV4 is connected with a 0V line, the part is used for controlling a 4# pneumatic valve, the intermediate relay module comprises an intermediate relay KA8 normally open contact, one end of the intermediate relay KA8 normally open contact is connected with a +24V line, the other end of the intermediate relay KA8 normally open contact is connected with one end of a solenoid valve YV5, the other end of the solenoid valve YV5 is connected with a 0V line, the part is used for controlling a 5# pneumatic valve, the intermediate relay module comprises an intermediate relay KA9 normally open contact, one end of the intermediate relay KA9 normally open contact is connected with a +24V line, the other end of the intermediate relay KA9 normally open contact is connected with one end of a solenoid valve YV6, the other end of the electromagnetic valve YV6 is connected with a 0V line, and the part is used for controlling a No. 6 pneumatic valve.

Further, the intermediate relay module further comprises an intermediate relay KA10 normally open contact, one end of the intermediate relay KA10 normally open contact is connected with a +24V line, the other end of the intermediate relay KA10 normally open contact is connected with one end of an indicator light red, the other end of the indicator light red is connected with a 0V line, the part is used for controlling the indicator light red, the intermediate relay module further comprises an intermediate relay KA11 normally open contact, one end of the intermediate relay KA11 normally open contact is connected with a +24V line, the other end of the intermediate relay KA11 normally open contact is connected with one end of an indicator light green, the other end of the indicator light green is connected with a 0V line, the part is used for controlling the indicator light green, the intermediate relay module further comprises an intermediate relay KA12 normally open contact, one end of the intermediate relay KA12 normally open contact is connected with a +24V line, the other end of the intermediate relay KA12 contact is connected with one end of the indicator light yellow, the yellow other end of pilot lamp connects 0V line, and this part is used for the yellow control of pilot lamp, the auxiliary relay module still includes auxiliary relay KA13 normally open contact, and auxiliary relay KA13 normally open contact one end is connected with +24V line, and the auxiliary relay KA13 normally open contact other end is connected with the one end of pilot lamp buzzer, and 0V line is connected to the other end of pilot lamp buzzer, and this part is used for the control of pilot lamp buzzer.

Further, one end of a pin Q1.1 at the output end of the CPU unit U1 is connected with one end of an intermediate relay KA10 coil, the other end of the intermediate relay KA10 coil is connected with a 0V line, the part is used for controlling the red opening of the indicator light, one end of a pin Q1.2 at the output end of the CPU unit U1 is connected with one end of the intermediate relay KA11 coil, the other end of the intermediate relay KA11 coil is connected with the 0V line, the part is used for controlling the green opening of the indicator light, one end of a pin Q1.3 at the output end of the CPU unit U1 is connected with one end of the intermediate relay KA12 coil, the other end of the intermediate relay KA12 coil is connected with the 0V line, the part is used for controlling the yellow opening of the indicator light, one end of a pin Q1.4 at the output end of the CPU unit U1 is connected with one end of the intermediate relay KA13 coil, the other end of the intermediate relay KA13 coil is connected with the 0V line, and the part is used for controlling the opening of the buzzer of the indicator light.

Furthermore, the pin I0.0 at the input end of the CPU unit U1 is connected with one end of a contact switch K1, the other end of the contact switch K1 is connected with a +24V line, the part is used for detecting the fault of the inverter of the No. 1 water pump motor, the pin I0.1 at the input end of the CPU unit U1 is connected with one end of a contact switch K2, the other end of the contact switch K2 is connected with a +24V line, the part is used for detecting the fault of the inverter of the No. 2 water pump motor, the pin I0.2 at the input end of the CPU unit U1 is connected with one end of a contact switch K3, the other end of the contact switch K3 is connected with a +24V line, the part is used for detecting the fault of the inverter of the No. 3 water pump motor, the pin I0.3 at the input end of the CPU unit U1 is connected with one end of a contact switch K4, the other end of a contact switch K4 is connected with a +24V line, the part is used for detecting the alarm of a thermal relay 1, the pin I0.4 at the input end of the CPU unit U1 is connected with one end of a contact switch K5, the other end of the contact switch K5 is connected to a +24V line, the part is used for alarm detection of a thermal relay RJ2, an I0.5 pin at the input end of the CPU unit U1 is connected with one end of the contact switch K6, the other end of the contact switch K6 is connected to a +24V line, the part is used for alarm detection of a thermal relay RJ3, an I0.6 pin at the input end of the CPU unit U1 is connected with one end of a knob switch S1, the other end of the knob switch S1 is connected to a +24V line, the part is used for manual/automatic control knob detection of equipment, an I0.7 pin at the input end of the CPU unit U1 is connected with one end of a knob switch S2, and the other end of the knob switch S2 is connected to a +24V line, and the part is used for emergency stop button detection of the equipment.

Furthermore, the L + pin and the M pin of the PLC analog unit U2 are connected with a +24V line and a 0V line, the part is used for a power supply of the PLC analog unit U2, the RA pin and the A + pin of the PLC analog unit U2 are connected with AI0+ signals, the RA-pin of the PLC analog unit U2 is connected with AI 0-signals, the part is used for collecting frequency feedback signals of a 1# water pump motor, the RB pin and the B + pin of the PLC analog unit U2 are connected with AI2+ signals, the RC-pin of the analog unit U2 is connected with AI 2-signals, the part is used for collecting frequency feedback signals of a 2# water pump motor, the RC pin and the C + pin of the PLC analog unit U2 are connected with AI4+ signals, the RB-pin of the PLC analog unit U2 is connected with AI 4-signals, the part is used for collecting frequency feedback signals of a 3# water pump motor, and the RD pin of the PLC analog unit U2 is connected with AI 4-signals, The D + pin is connected with an AI6+ signal, the RD-pin of the PLC analog quantity unit U2 is connected with an AI 6-signal, the part is used for collecting a liquid level signal of a water storage tank, the M0 pin of the PLC analog quantity unit U2 is connected with an AQ 0-signal, the I0 pin of the PLC analog quantity unit U2 is connected with an AQ0+ signal, and the part is used for outputting a 1# water pump motor frequency signal.

Further, an L + pin and an M + pin of the PLC analog unit U3 are connected with a +24V line and a 0V line, the part is used for a power supply of the PLC analog unit U3, an RA pin and an A + pin of the PLC analog unit U3 are connected with AI8+ signals, an RA-pin of the PLC analog unit U3 is connected with AI 8-signals, the part is used for collecting pressure signals of a pressure stabilizing tank, an RB pin and a B + pin of the PLC analog unit U3 are connected with AI10+ signals, an RB-pin of the PLC analog unit U3 is connected with AI 10-signals, the part is used for collecting pressure signals of tap water, an RC pin and a C + pin of the PLC analog unit U3 are connected with AI12+ signals, and an RC-pin of the PLC analog unit U3 is connected with AI 12-signals, and the part is used for collecting water supply signals;

the L + pin and the M pin of the PLC analog unit U4 are connected with a +24V line and a 0V line, the part is used for a power supply of the PLC analog unit U4, the M0 pin of the PLC analog unit U4 is connected with an AQ 4-signal, the I0 pin of the PLC analog unit U4 is connected with an AQ4+ signal, the part is used for outputting a 2# water pump motor frequency signal, the M1 pin of the PLC analog unit U4 is connected with an AQ 6-signal, the I0 pin is connected with an AQ6+ signal, and the part is used for outputting a # water pump motor frequency signal.

Further, the motor driving module comprises a 1# water pump motor frequency converter T1, a 2# water pump motor frequency converter T2 and a 3# water pump motor frequency converter T3, wherein an R pin, an S pin and a T pin of the 1# water pump motor frequency converter T1 are connected with an L1 line, an L2 line and an L3 line which are used for supplying power to a 1# water pump motor frequency converter T1, a U pin, a V pin and a W pin of the 1# water pump motor frequency converter T1 are connected with a 1# water pump motor M1, a DI1 pin of the 1# water pump motor frequency converter T1 is connected with one end of an intermediate relay KA1, the other end of the intermediate relay KA1 is connected with a COM pin of a 1# water pump motor frequency converter T1, an AI1 pin of the 1# water pump motor frequency converter T1 is connected with an AQ0+ signal of a PLC analog quantity unit U2, a 1# water pump motor frequency converter T36 1 pin of the PLC motor frequency converter T36 1 is connected with an AQ signal of an analog quantity unit AI0+ 0 of the PLC AI0, and the PLC 3 signal of the analog quantity unit AI0+ 0 of the PLC 3 water pump motor 0, a 2# GND pin of the 1# water pump motor frequency converter T1 is connected with an AI 0-signal of a PLC analog unit U2, and the part is used for driving the 1# water pump motor M1 to operate and controlling the speed and the direction of the operation of the 1# water pump motor M1;

the R pin, the S pin and the T pin of the 2# water pump motor frequency converter T2 are connected with an L1 wire, an L2 wire and an L3 wire which are used for providing power for a 2# water pump motor frequency converter T2, the U pin, the V pin and the W pin of the 2# water pump motor frequency converter T2 are connected with a 2# water pump motor M2, the DI1 pin of the 2# water pump motor frequency converter T2 is connected with one end of an intermediate relay KA2, the other end of the intermediate relay KA2 is connected with the COM pin of a 2# water pump motor frequency converter T2, the AI1 pin of the 2# water pump motor frequency converter T2 is connected with an AQ4+ signal of a PLC analog quantity unit U4, the 1# pin of the 2# water pump motor frequency converter T2 is connected with an AQ 4-signal of the PLC analog quantity unit U4, the AO1 pin of the 2# water pump motor frequency converter T2 is connected with an AI2+ signal of the PLC analog quantity unit U2, and the AI-GND signal of the PLC analog quantity unit U2 is connected with the GND signal of the 2# water pump motor T2, the part is used for driving the 2# water pump motor M2 to operate and controlling the speed and the direction of the 2# water pump motor M2 to operate;

the 3# water pump motor frequency converter T3 is characterized in that an R pin, an S pin and a T pin of a 3# water pump motor frequency converter T3 are connected with an L1 line, an L2 line and an L3 line, the part is used for a power supply of a 3# water pump motor frequency converter T3, a U pin, a V pin and a W pin of the 3# water pump motor frequency converter T3 are connected with a 3# water pump motor M3, a DI1 pin of the 3# water pump motor frequency converter T3 is connected with one end of an intermediate relay KA3, the other end of the intermediate relay KA3 is connected with a COM pin of a 3# water pump motor frequency converter T3, an AI1 pin of the 3# water pump motor frequency converter T3 is connected with an AQ6+ signal of a PLC analog quantity unit U4, a GND # pin of the 3# water pump motor frequency converter T3 is connected with an AQ 4-signal of the PLC analog quantity unit U4, a GND # water pump motor frequency converter T4 pin of the 3# water pump motor frequency converter T4 is connected with an AQ signal of the PLC analog quantity unit U8672, and a GND analog quantity unit AI4 of the PLC # water pump motor AI4 pin of the 3# water pump motor T4 is connected with the GND analog quantity unit AI 72 of the GND analog quantity unit AI 72, this section is used to drive the 3# water pump motor M3 to operate and to control the speed and direction of operation of the 3# water pump motor M3.

An implementation method of an automatic switching non-negative pressure water supply system comprises the following steps:

the working procedure starts in step S100, and the procedure starts, and step S101 is executed;

step S101, judging whether the tap water pressure meets a device starting signal or not by the control system, if so, executing step S102; if not, go to step S103;

step S102, starting a 2# pneumatic valve, and closing the 1# pneumatic valve and a 3# pneumatic valve; executing the step S104;

step S103, starting the 1# pneumatic valve and the 3# pneumatic valve, closing the 2# pneumatic valve and the 4# pneumatic valve, and closing the 1# water pump motor; executing step S104;

step S104, starting a No. 2 water pump motor; executing step S105;

step S105, the control system judges whether the water supply pressure meets the water supply requirement; if yes, the process jumps to the process start S101, otherwise, step S106 is executed;

step S106, starting a 3# water pump motor; jump to the program start S101, and so on.

The water replenishing and circulating program of the water storage tank starts to step S200, and the program starts to execute step S201;

step S201, judging whether the liquid level of the water storage tank reaches a set liquid level by a control system, if so, executing step S202; if not, go to step S203;

step S202, starting a No. 1 water pump motor, closing a No. 1 pneumatic valve and a No. 3 pneumatic valve, and opening a No. 4 pneumatic valve; the program jumps to program start S201;

step S203, turning off a 1# water pump motor, turning off a 3# pneumatic valve and a 4# pneumatic valve, and turning on the 1# pneumatic valve; executing the step S204;

step S204, the control system judges whether the tap water pressure meets the equipment starting signal; if yes, the process jumps to the process start S201; if not, go to step S205;

step S205, closing the 1# pneumatic valve and waiting for the pressure of tap water to rise; the program jumps to program start S204; this is repeated.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

1. this system is provided with the storage water tank, and the storage water tank communicates with each other with municipal water supply pipe and equipment surge tank, and when municipal water supply pressure was normal, inside hydrologic cycle can be done to the storage water tank, prevents to be unnecessary for a long time, leads to storage water tank quality of water to deteriorate, and when municipal water supply pressure crossed low or when anhydrous, can automatic switch into storage water tank water supply mode, ensures the incessant water supply of equipment.

2. This system adopts siemens PLC control system, still be provided with serial ports commentaries on classics net mouth module and well control computer simultaneously, serial ports commentaries on classics net mouth module one end and PLC control system's serial ports connection, the other end is connected with well control computer again, PLC control system is in controlgear normal operating, through serial ports commentaries on classics net mouth module with control command and operation data, transmit for well control computer, well control computer is internet and cell-phone communication network again can be connected, can realize not at the equipment scene, just can monitor with controlgear's operation, when equipment operation is abnormal, can accomplish quick response and processing.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale or oriented in the actual sense.

FIG. 1 is an electrical schematic diagram of a main power module of the present invention;

FIG. 2 is an electrical schematic of the inventive intermediate relay module;

FIG. 3 is an electrical schematic of the CPU unit of the PLC module of the present invention;

fig. 4 is an electrical schematic diagram of a PLC analog input unit U2 of the PLC module of the present invention;

fig. 5 is an electrical schematic diagram of a PLC analog input unit U3 of the PLC module of the present invention;

fig. 6 is an electrical schematic diagram of a PLC analog input unit U4 of the PLC module of the present invention;

FIG. 7 is an electrical schematic of the motor drive module of the present invention;

fig. 8 and 9 are flowcharts of methods implemented in the present invention.

Detailed Description

Embodiment 1, an automatic switching's no negative pressure water supply system, includes main power source module, auxiliary relay module, PLC module and motor drive module, and main power source module provides the power supply for this system, and the auxiliary relay module provides this system's control circuit, and the PLC module is this system's control core, is the place of sending out of output and input instruction, also is the center of network conversion, and motor drive module is this system's drive information acquisition mechanism.

The main power module comprises a circuit breaker, the circuit breaker is connected with a water pump motor frequency converter, the water pump motor frequency converter is connected with a thermal relay and a water pump motor, the thermal relay and the water pump motor are used for providing a power supply for the water pump motor, and the circuit breaker is further connected with a direct-current 24-volt switching power supply and is used for providing 24V power supply for the touch screen, the serial port network switching port module and other electrical appliances.

As shown in fig. 1, the main power module includes a three-phase power source R line, an S line, a T line and an N line, the three-phase power source R line, the S line, the T line and the N line are connected with one end of a breaker QF1, the other end of the breaker QF1 is connected with a three-phase power source L1 line, an L2 line, an L3 line and the N line, the three-phase power source L1 line, the L2 line and the L3 line are connected with one end of a breaker QF2, the other end of the breaker QF2 is connected with one end of a 1# water pump motor inverter T1, the other end of the 1# water pump motor inverter T1 is connected with one end of a thermal relay RJ1, and the other end of the thermal relay RJ1 is connected with a 1# water pump motor M1, which is used for driving the 1# water pump motor M1 to operate and thermally protect.

Three phase current source L1 line, L2 line, L3 line are connected with circuit breaker QF3 one end, the circuit breaker QF3 other end is connected with 2# water pump motor converter T2 one end, 2# water pump motor converter T2 other end is connected with the one end of electrothermal relay RJ2, the other end of electrothermal relay RJ2 is connected with 2# water pump motor M2, this part is used for driving 2# water pump motor M1 operation and thermal protection.

Three phase current source L1 line, L2 line, L3 line are connected with circuit breaker QF4 one end, the circuit breaker QF4 other end is connected with 3# water pump motor converter T3 one end, 3# water pump motor converter T3 other end is connected with the one end of electrothermal relay RJ3, the other end of electrothermal relay RJ3 is connected with 3# water pump motor M3, this part is used for driving the operation of 3# water pump motor M3 and thermal protection.

The intermediate relay module comprises an intermediate relay normally open contact, the intermediate relay normally open contact is connected with an electromagnetic valve, the intermediate relay normally open contact is used for controlling the pneumatic valve to start and stop a loop, the intermediate relay normally open contact is further connected with an indicator lamp, and the intermediate relay normally open contact is used for controlling the indicator lamp to start and stop.

As shown in fig. 2, the intermediate relay module comprises an intermediate relay KA4 normally open contact, one end of the normally open contact of the intermediate relay KA4 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA4 is connected with one end of a solenoid valve YV1, the other end of the solenoid valve YV1 is connected with a 0V line, the intermediate relay module is used for controlling a # 1 pneumatic valve, the normally open contact of the intermediate relay KA5 is further comprised, one end of the normally open contact of the intermediate relay KA5 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA5 is connected with one end of a solenoid valve YV2, the other end of the solenoid valve YV2 is connected with a 0V line, the part is used for controlling a # 2 pneumatic valve, the intermediate relay module comprises a normally open contact of the intermediate relay KA6, one end of the normally open contact of the intermediate relay KA6 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA6 is connected with one end of a solenoid valve YV3, the other end of the solenoid valve YV3 is connected with a 0V line, the part is used for controlling a 3# pneumatic valve, the intermediate relay module comprises an intermediate relay KA7 normally open contact, one end of the intermediate relay KA7 normally open contact is connected with a +24V line, the other end of the intermediate relay KA7 normally open contact is connected with one end of a solenoid valve YV4, the other end of the solenoid valve YV4 is connected with a 0V line, the part is used for controlling a 4# pneumatic valve, the intermediate relay module comprises an intermediate relay KA8 normally open contact, one end of the intermediate relay KA8 normally open contact is connected with a +24V line, the other end of the intermediate relay KA8 normally open contact is connected with one end of a solenoid valve YV5, the other end of the solenoid valve YV5 is connected with a 0V line, the part is used for controlling a 5# pneumatic valve, the intermediate relay module comprises an intermediate relay KA9 normally open contact, one end of the intermediate relay KA9 normally open contact is connected with a +24V line, the other end of the intermediate relay KA9 normally open contact is connected with one end of a solenoid valve YV6, the other end of the electromagnetic valve YV6 is connected with a 0V line, and the part is used for controlling a No. 6 pneumatic valve.

The intermediate relay module also comprises an intermediate relay KA10 normally open contact, one end of the normally open contact of the intermediate relay KA10 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA10 is connected with one end of an indicator light red, the other end of the indicator light red is connected with a 0V line, the normally open contact of the intermediate relay KA11 is used for controlling the indicator light red, one end of the normally open contact of the intermediate relay KA11 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA11 is connected with one end of an indicator light green, the other end of the indicator light green is connected with a 0V line, the normally open contact of the intermediate relay KA12 is used for controlling the indicator light green, one end of the normally open contact of the intermediate relay KA12 is connected with a +24V line, the other end of the normally open contact of the intermediate relay KA12 is connected with one end of the indicator light yellow, and the other end of the indicator light yellow is connected with a 0V line, this part is used for the yellow control of pilot lamp, the intermediate relay module still includes intermediate relay KA13 normally open contact, and intermediate relay KA13 normally open contact one end is connected with +24V line, and the intermediate relay KA13 normally open contact other end is connected with the one end of pilot lamp buzzer, and 0V line is connected to the other end of pilot lamp buzzer, and this part is used for the control of pilot lamp buzzer.

As shown in fig. 3, the PLC module includes a CPU unit U1, a 232 serial port of the CPU unit U1 is connected to a serial port of the touch screen, this part is used for communication between the CPU unit U1 and the touch screen, and can transmit data and instructions of this system to the touch screen, a 485 serial port of the CPU unit U1 is connected to a serial port-to-network port module, the serial port-to-network port module is connected to a central control computer, this part is used for communication between the CPU unit U1 and the central control computer, and can transmit data and instructions of this system to the central control computer.

The output end of the CPU unit U1 is connected with an intermediate relay coil, and the output end of the CPU unit U1 controls the relay coil to realize the starting of a water pump motor, a pneumatic valve and an indicator light.

The L + pin and the M pin of the CPU unit U1 are connected with a +24V wire and a 0V wire, the part is used for a power supply of the CPU unit U1, the M pin, the 1M pin and the 2M pin of the CPU unit U1 are connected with a 0V wire, the L pin, the 1L pin and the 2L pin of the CPU unit U1 are connected with a +24V wire, the part is used for common connection of all control pins of the CPU unit U1, one end of a Q0.0 pin of an output end of the CPU unit U1 is connected with one end of an intermediate relay KA1 coil, the other end of the intermediate relay KA1 coil is connected with a 0V wire, the part is used for controlling the operation of a 1# water pump motor, one end of a Q0.1 pin of an output end of the CPU unit U1 is connected with one end of an intermediate relay KA2 coil, the other end of the intermediate relay KA2 coil is connected with a 0V wire, the part is used for controlling the operation of a 2# water pump motor, one end of a Q0.2 pin 3 coil of an output end of the CPU unit U1, the other end of the coil of the intermediate relay KA3 is connected with a 0V wire, the part is used for controlling the operation of a No. 3 water pump motor, one end of a Q0.3 pin of the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA4, the other end of the coil of the intermediate relay KA4 is connected with a 0V wire, the part is used for controlling the opening of a No. 1 pneumatic valve, one end of a Q0.4 pin of the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA5, the other end of the coil of the intermediate relay KA5 is connected with a 0V wire, the part is used for controlling the opening of a No. 2 pneumatic valve, one end of a Q0.5 pin of the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA6, the other end of the coil of the intermediate relay KA6 is connected with a 0V wire, the part is used for controlling the opening of a No. 3 pneumatic valve, one end of a Q0.6 pin of the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA7, and the other end of the coil of the intermediate relay 7 is connected with a 0V wire, the part is used for controlling the opening of a 4# pneumatic valve, one end of a Q0.7 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA8, the other end of the coil of the intermediate relay KA8 is connected with a 0V wire, the part is used for controlling the opening of a 5# pneumatic valve, one end of a Q1.0 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA9, the other end of the coil of an intermediate relay KA9 is connected with a 0V wire, and the part is used for controlling the opening of a 6# pneumatic valve.

The one end of the Q1.1 foot of CPU unit U1 output is connected with the one end of auxiliary relay KA10 coil, and the 0V line is connected to the other end of auxiliary relay KA10 coil, and this part is used for the red control of opening of pilot lamp, the Q1.2 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA11 coil, and the 0V line is connected to the other end of auxiliary relay KA11 coil, and this part is used for the green control of opening of pilot lamp, the Q1.3 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA12 coil, and the other end of auxiliary relay KA12 coil is connected 0V line, and this part is used for the control that pilot lamp buzzer opened, the Q1.4 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA13 coil, and the other end of auxiliary relay KA13 coil is connected 0V line, and this part is used for the control that pilot lamp buzzer opened.

The input end of the CPU unit U1 is connected with a contact switch, and the input end of the CPU unit U1 detects the states of a water pump motor frequency converter, a water pump motor thermal relay and an equipment knob through the contact switch.

The I0.0 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K1, the other end of the contact switch K1 is connected with a +24V line, the part is used for detecting the fault of a 1# water pump motor frequency converter, the I0.1 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K2, the other end of the contact switch K2 is connected with a +24V line, the part is used for detecting the fault of a 2# water pump motor frequency converter, the I0.2 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K3, the other end of the contact switch K3 is connected with a +24V line, the part is used for detecting the fault of a 3# water pump motor frequency converter, the I0.3 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K4, the other end of a contact switch K4 is connected with the +24V line, the part is used for detecting the alarm of a thermal relay RJ1, the I0.4 pin of the input end of the CPU unit U1 is connected with a contact K5, the other end of the contact switch K5 is connected to a +24V line, the part is used for alarm detection of a thermal relay RJ2, an I0.5 pin of an input end of a CPU unit U1 is connected with one end of the contact switch K6, the other end of the contact switch K6 is connected to a +24V line, the part is used for alarm detection of the thermal relay RJ3, an I0.6 pin of an input end of a CPU unit U1 is connected with one end of a knob switch S1, the other end of the knob switch S1 is connected to the +24V line, the part is used for manual/automatic control knob detection of equipment, an I0.7 pin of an input end of a CPU unit U1 is connected with one end of a knob switch S2, the other end of a knob switch S2 is connected to the +24V line, and the part is used for emergency stop button detection of the equipment.

As shown in fig. 4, the PLC module further includes a PLC analog unit U2, an input end of the PLC analog unit U2 is used for collecting signals of the frequency of the water pump motor and the liquid level of the water storage tank, and an output end of the PLC analog unit U2 is used for outputting a frequency signal of the 1# water pump motor, and transmitting the processed signal data to the CPU unit U1, so as to provide a signal basis for the control of the system.

The L + pin and the M pin of the PLC analog unit U2 are connected with a +24V line and a 0V line, the part is used for a power supply of a PLC analog unit U2, the RA pin and the A + pin of the PLC analog unit U2 are connected with AI0+ signals, the RA-pin of the PLC analog unit U2 is connected with AI 0-signals, the part is used for collecting frequency feedback signals of a 1# water pump motor, the RB pin and the B + pin of the PLC analog unit U2 are connected with AI2+ signals, the RC-pin of the analog unit U2 is connected with AI 2-signals, the part is used for collecting frequency feedback signals of a 2# water pump motor, the RC pin and the C + pin of the PLC analog unit U2 are connected with AI4+ signals, the RB-pin of the PLC analog unit U2 is connected with AI 4-signals, the part is used for collecting frequency feedback signals of a 3# water pump motor, the RD pin of the PLC analog unit U2 is connected with AI 4-signals, and the RD pin of the PLC analog unit U2 is connected with AI 4-signals, The D + pin is connected with an AI6+ signal, the RD-pin of the PLC analog quantity unit U2 is connected with an AI 6-signal, the part is used for collecting a liquid level signal of a water storage tank, the M0 pin of the PLC analog quantity unit U2 is connected with an AQ 0-signal, the I0 pin of the PLC analog quantity unit U2 is connected with an AQ0+ signal, and the part is used for outputting a 1# water pump motor frequency signal.

As shown in fig. 5, the PLC module further includes a PLC analog unit U3, and the PLC analog unit U3 is configured to collect signals of the surge tank pressure, the tap water pressure, and the water supply pressure, and transmit processed signal data to the CPU unit U1, so as to provide a signal basis for the control of the system.

The PLC analog unit U3 is characterized in that an L + pin and an M pin are connected with a +24V line and a 0V line, the part is used for a power supply of a PLC analog unit U3, an RA pin and an A + pin of the PLC analog unit U3 are connected with AI8+ signals, an RA-pin of the PLC analog unit U3 is connected with AI 8-signals, the part is used for collecting pressure signals of a surge tank, an RB pin and a B + pin of the PLC analog unit U3 are connected with AI10+ signals, an RB-pin of the PLC analog unit U3 is connected with AI 10-signals, the part is used for collecting pressure signals of tap water, an RC pin and a C + pin of the PLC analog unit U3 are connected with AI12+ signals, and an RC-pin of the PLC analog unit U3 is connected with AI 12-signals, and the part is used for collecting water supply signals.

As shown in fig. 6, the PLC module further includes a PLC analog unit U4, and an output end of the PLC analog unit U4 is configured to output frequency signals of the 2# water pump motor and the 3# water pump motor, and transmit processed signal data to the CPU unit U1, so as to provide a signal basis for system control.

The motor driving module comprises a 1# water pump motor frequency converter T1, a 2# water pump motor frequency converter T2 and a 3# water pump motor frequency converter T3, the 1# water pump motor frequency converter T1, the 2# water pump motor frequency converter T2 and the 3# water pump motor frequency converter T3, the 1# water pump motor frequency converter T1 is connected with a 1# water pump motor M1, the 2# water pump motor frequency converter T2 is connected with a 2# water pump motor M2, the 3# water pump motor frequency converter T3 is connected with a 3# water pump motor M3, and the part is used for controlling the speed and the direction of the operation of the corresponding water pump motor and feeding back the operation state of the motor to the PLC module part.

As shown in fig. 7, the R, S, T pins of the 1# water pump motor inverter T1 are connected with L1, L2, L3 lines, which are used to provide power to the 1# water pump motor inverter T1, the U, V, W pins of the 1# water pump motor inverter T1 are connected with the 1# water pump motor M1, the DI1 pin of the 1# water pump motor inverter T1 is connected with one end of an intermediate relay KA1, the other end of the intermediate relay KA1 is connected with the COM pin of the 1# water pump motor inverter T1, the AI1 pin of the 1# water pump motor inverter T1 is connected with the AQ0+ signal of a PLC analog quantity unit U2, the 1# GND 0-signal of a PLC analog quantity unit U2 is connected with the 1# GND 1 pin of the 1# water pump motor inverter T1 is connected with the PLC analog quantity unit U2 + signal of the PLC analog quantity unit U2, and the AI signal 2-2 of the 1# water pump motor inverter T2 is connected with the GND signal of the PLC analog quantity unit al 2, this section is used to drive the 1# water pump motor M1 to operate and control the speed and direction of operation of the 1# water pump motor M1.

As shown in fig. 7, the R, S, T pins of the 2# water pump motor inverter T2 are connected with L1, L2, L3 lines, which are used to provide power to the 2# water pump motor inverter T2, the U, V, W pins of the 2# water pump motor inverter T2 are connected with the 2# water pump motor M2, the DI1 pin of the 2# water pump motor inverter T2 is connected with one end of an intermediate relay KA2, the other end of the intermediate relay KA2 is connected with the COM pin of the 2# water pump motor inverter T2, the AI1 pin of the 2# water pump motor inverter T2 is connected with the AQ4+ signal of the PLC analog unit U4, the 1# GND 4-signal of the PLC analog unit U4 is connected with the AI pin of the AI4+ signal of the PLC analog unit U4, the AI 8672 pin of the 2# water pump motor inverter T2 is connected with the AQ 4-signal of the PLC analog unit U2, the AI analog unit 2 signal of the PLC analog unit 2 is connected with the AI pin 2-2 of the 2# water pump motor inverter T36 2, this part is used to drive the 2# water pump motor M2 to operate and control the speed and direction of the 2# water pump motor M2.

As shown in fig. 7, the 3# water pump motor inverter T3, wherein the R pin, S pin and T pin of the 3# water pump motor inverter T3 are connected with the L1 line, L2 line and L3 line, and this part is used for the power supply of the 3# water pump motor inverter T3, the U pin, V pin and W pin of the 3# water pump motor inverter T3 are connected with the 3# water pump motor M3, the DI1 pin of the 3# water pump motor inverter T3 is connected with one end of the intermediate relay KA3, the other end of the intermediate relay KA3 is connected with the COM pin of the 3# water pump motor inverter T3, the AI1 pin of the 3# water pump motor inverter T53 is connected with the AQ6+ signal of the PLC analog quantity unit U4, the 1# pin of the 3# water pump motor inverter T3 is connected with the AQ 4-signal of the PLC analog quantity unit U4, the AO signal of the 3# water pump motor inverter T4 is connected with the GND analog quantity signal 4 of the PLC analog quantity unit al 4, and the GND signal of the PLC analog quantity 4 of the al pin of the PLC analog quantity unit al 4, this part is used to drive the 3# water pump motor M3 to operate and control the speed and direction of the 3# water pump motor M3.

To further illustrate the non-negative pressure water supply system capable of networking and automatically switching and the implementation method thereof, as shown in fig. 8, the steps of the implementation method will be described as follows.

step S102, starting a 2# pneumatic valve, and closing the 1# pneumatic valve and a 3# pneumatic valve; executing step S104;

step S104, starting a No. 2 water pump motor; executing step S105;

As shown in fig. 9, the procedure of water replenishing and circulating of the water storage tank starts at step S200, and the procedure starts and proceeds to step S201;

step S203, turning off a 1# water pump motor, turning off a 3# pneumatic valve and a 4# pneumatic valve, and turning on the 1# pneumatic valve; executing step S204;

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

1. The utility model provides an automatic no negative pressure water supply system who switches which characterized in that: the system comprises a main power supply module, an intermediate relay module, a PLC module and a motor driving module, wherein the main power supply module provides a power supply for the system, the intermediate relay module provides a control loop of the system, the PLC module is a control core of the system, is a place for sending output and input instructions and is also a center for network conversion, and the motor driving module is a driving information acquisition mechanism of the system;

the L + pin and the M pin of the CPU unit U1 are connected with a +24V line and a 0V line, the part is used for a power supply of the CPU unit U1, the M pin, the 1M pin and the 2M pin of the CPU unit U1 are connected with a 0V line, the L pin, the 1L pin and the 2L pin of the CPU unit U1 are connected with a +24V line, the part is used for common connection of all control pins of the CPU unit U1, one end of a Q0.0 pin at the output end of the CPU unit U1 is connected with one end of a KA1 coil of an intermediate relay, the other end of a KA1 coil of the intermediate relay is connected with a 0V line, the part is used for controlling the operation of a No. 1 water pump motor, one end of a Q0.1 pin at the output end of the CPU unit U1 is connected with one end of a KA2 coil of the intermediate relay, the other end of a KA2 coil of the intermediate relay is connected with a 0V line, the part is used for controlling the operation of a No. 2 water pump motor, one end of a Q0.2 pin 3 coil of an output end of the CPU unit U1, the other end of the coil of the intermediate relay KA3 is connected with a 0V wire, the part is used for controlling the operation of a No. 3 water pump motor, one end of a Q0.3 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA4, the other end of the coil of the intermediate relay KA4 is connected with a 0V wire, the part is used for controlling the opening of a No. 1 pneumatic valve, one end of a Q0.4 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA5, the other end of a coil of the intermediate relay KA5 is connected with a 0V wire, the part is used for controlling the opening of a No. 2 pneumatic valve, one end of a Q0.5 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA6, the other end of a coil of the intermediate relay KA6 is connected with a 0V wire, the part is used for controlling the opening of a No. 3 pneumatic valve, one end of a Q0.6 pin at the output end of the CPU unit U1 is connected with one end of a coil of the intermediate relay KA7, and the other end of the coil of the intermediate relay 7 is connected with a 0V wire, the part is used for controlling the opening of a 4# pneumatic valve, one end of a Q0.7 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA8, the other end of the coil of the intermediate relay KA8 is connected with a 0V wire, the part is used for controlling the opening of a 5# pneumatic valve, one end of a Q1.0 pin at the output end of the CPU unit U1 is connected with one end of a coil of an intermediate relay KA9, the other end of the coil of an intermediate relay KA9 is connected with a 0V wire, and the part is used for controlling the opening of a 6# pneumatic valve.

2. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the main power module comprises a three-phase power supply R line, an S line, a T line and an N line, wherein the three-phase power supply R line, the S line, the T line and the N line are connected with one end of a breaker QF1, the other end of the breaker QF1 is connected with a three-phase power supply L1 line, an L2 line, an L3 line and an N line, the three-phase power supply L1 line, the L2 line and the L3 line are connected with one end of a breaker QF2, the other end of the breaker QF2 is connected with one end of a 1# water pump motor frequency converter T1, the other end of the 1# water pump motor frequency converter T1 is connected with one end of a thermal relay RJ1, the other end of the thermal relay RJ1 is connected with a 1# water pump motor M1, and the three-phase power supply R line, the S line, the T line and the N line are used for driving the 1# water pump motor M1 to operate and thermally protect;

the three-phase power supply line L1, the line L2 and the line L3 are connected with one end of a breaker QF4, the other end of the breaker QF4 is connected with one end of a 3# water pump motor frequency converter T3, the other end of a 3# water pump motor frequency converter T3 is connected with one end of a thermal relay RJ3, the other end of the thermal relay RJ3 is connected with a 3# water pump motor M3, and the three-phase power supply line L1, the line L2 and the line L3 are used for driving the 3# water pump motor M3 to operate and thermally protect;

the three-phase power supply L1 line, N line are connected with circuit breaker QF5 one end, and circuit breaker QF5 other end is connected with switching power supply's one end, and switching power supply's the other end is connected with +24V line, 0V line, +24V line, 0V line are connected with touch-sensitive screen one end and the one end of serial ports commentaries on classics net mouth, and this part is used for turning to the net mouth power supply for touch-sensitive screen one end and serial ports, also is used for providing the direct current 24V power supply for other electrical apparatus.

3. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the intermediate relay module comprises an intermediate relay KA4 normally open contact, one end of the intermediate relay KA4 normally open contact is connected with a +24V line, the other end of the intermediate relay KA4 normally open contact is connected with one end of a solenoid valve YV1, the other end of the solenoid valve YV1 is connected with a 0V line, the part is used for controlling a # 1 pneumatic valve, the intermediate relay module further comprises an intermediate relay KA5 normally open contact, one end of the intermediate relay KA5 normally open contact is connected with a +24V line, the other end of the intermediate relay KA5 normally open contact is connected with one end of a solenoid valve YV2, the other end of the solenoid valve YV2 is connected with a 0V line, the part is used for controlling a # 2 pneumatic valve, the intermediate relay module comprises an intermediate relay KA6 normally open contact, one end of the intermediate relay KA 25 normally open contact is connected with a +24V line, the other end of the intermediate relay 73KA 6 normally open contact is connected with one end of a solenoid valve YV3, the other end of the solenoid valve YV3 is connected with a 0V line, the part is used for controlling a 3# pneumatic valve, the intermediate relay module comprises an intermediate relay KA7 normally open contact, one end of the intermediate relay KA7 normally open contact is connected with a +24V line, the other end of the intermediate relay KA7 normally open contact is connected with one end of a solenoid valve YV4, the other end of the solenoid valve YV4 is connected with a 0V line, the part is used for controlling a 4# pneumatic valve, the intermediate relay module comprises an intermediate relay KA8 normally open contact, one end of the intermediate relay KA8 normally open contact is connected with a +24V line, the other end of the intermediate relay KA8 normally open contact is connected with one end of a solenoid valve YV5, the other end of the solenoid valve YV5 is connected with a 0V line, the part is used for controlling a 5# pneumatic valve, the intermediate relay module comprises an intermediate relay KA9 normally open contact, one end of the intermediate relay KA9 normally open contact is connected with a +24V line, the other end of the intermediate relay KA9 normally open contact is connected with one end of a solenoid valve YV6, the other end of the electromagnetic valve YV6 is connected with a 0V line, and the part is used for controlling a No. 6 pneumatic valve.

4. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the intermediate relay module also comprises an intermediate relay KA10 normally open contact, one end of the intermediate relay KA10 normally open contact is connected with a +24V wire, the other end of the intermediate relay KA10 normally open contact is connected with one end of an indicator light red, the other end of the indicator light red is connected with a 0V wire, the normally open contact is used for controlling the indicator light red, the intermediate relay module also comprises an intermediate relay KA11 normally open contact, one end of the intermediate relay KA11 normally open contact is connected with a +24V wire, the other end of the intermediate relay KA11 normally open contact is connected with one end of an indicator light green, the other end of the indicator light green is connected with a 0V wire, the normally open contact is used for controlling the indicator light green, the intermediate relay module also comprises an intermediate relay KA12 normally open contact, one end of the intermediate relay KA12 normally open contact is connected with a +24V wire, the other end of the intermediate relay KA12 normally open contact is connected with one end of the indicator light yellow, and the other end of the indicator light yellow is connected with a 0V wire, this part is used for the yellow control of pilot lamp, the intermediate relay module still includes intermediate relay KA13 normally open contact, and intermediate relay KA13 normally open contact one end is connected with +24V line, and the intermediate relay KA13 normally open contact other end is connected with the one end of pilot lamp buzzer, and 0V line is connected to the other end of pilot lamp buzzer, and this part is used for the control of pilot lamp buzzer.

5. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the one end of the Q1.1 foot of CPU unit U1 output is connected with the one end of auxiliary relay KA10 coil, and the 0V line is connected to the other end of auxiliary relay KA10 coil, and this part is used for the red control of opening of pilot lamp, the Q1.2 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA11 coil, and the 0V line is connected to the other end of auxiliary relay KA11 coil, and this part is used for the green control of opening of pilot lamp, the Q1.3 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA12 coil, and the other end of auxiliary relay KA12 coil is connected 0V line, and this part is used for the control that pilot lamp buzzer opened, the Q1.4 foot one end of CPU unit U1 output is connected with the one end of auxiliary relay KA13 coil, and the other end of auxiliary relay KA13 coil is connected 0V line, and this part is used for the control that pilot lamp buzzer opened.

6. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the I0.0 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K1, the other end of the contact switch K1 is connected with a +24V line, the part is used for detecting the fault of a 1# water pump motor frequency converter, the I0.1 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K2, the other end of the contact switch K2 is connected with a +24V line, the part is used for detecting the fault of a 2# water pump motor frequency converter, the I0.2 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K3, the other end of the contact switch K3 is connected with a +24V line, the part is used for detecting the fault of a 3# water pump motor frequency converter, the I0.3 pin of the input end of the CPU unit U1 is connected with one end of a contact switch K4, the other end of a contact switch K4 is connected with a +24V line, the part is used for detecting the alarm of a thermal relay RJ1, the I0.4 pin of the input end of the CPU unit U1 is connected with a contact switch K5, the other end of the contact switch K5 is connected to a +24V line, the part is used for alarm detection of a thermal relay RJ2, an I0.5 pin at the input end of the CPU unit U1 is connected with one end of the contact switch K6, the other end of the contact switch K6 is connected to a +24V line, the part is used for alarm detection of a thermal relay RJ3, an I0.6 pin at the input end of the CPU unit U1 is connected with one end of a knob switch S1, the other end of the knob switch S1 is connected to a +24V line, the part is used for manual/automatic control knob detection of equipment, an I0.7 pin at the input end of the CPU unit U1 is connected with one end of a knob switch S2, and the other end of the knob switch S2 is connected to a +24V line, and the part is used for emergency stop button detection of the equipment.

7. The automatically switching non-negative pressure water supply system according to claim 1, wherein: the L + pin and the M pin of the PLC analog unit U2 are connected with a +24V line and a 0V line, the part is used for a power supply of a PLC analog unit U2, the RA pin and the A + pin of the PLC analog unit U2 are connected with AI0+ signals, the RA-pin of the PLC analog unit U2 is connected with AI 0-signals, the part is used for collecting frequency feedback signals of a 1# water pump motor, the RB pin and the B + pin of the PLC analog unit U2 are connected with AI2+ signals, the RC-pin of the analog unit U2 is connected with AI 2-signals, the part is used for collecting frequency feedback signals of a 2# water pump motor, the RC pin and the C + pin of the PLC analog unit U2 are connected with AI4+ signals, the RB-pin of the PLC analog unit U2 is connected with AI 4-signals, the part is used for collecting frequency feedback signals of a 3# water pump motor, the RD pin of the PLC analog unit U2 is connected with AI 4-signals, and the RD pin of the PLC analog unit U2 is connected with AI 4-signals, The D + pin is connected with an AI6+ signal, the RD-pin of the PLC analog quantity unit U2 is connected with an AI 6-signal, the part is used for collecting a liquid level signal of a water storage tank, the M0 pin of the PLC analog quantity unit U2 is connected with an AQ 0-signal, the I0 pin of the PLC analog quantity unit U2 is connected with an AQ0+ signal, and the part is used for outputting a 1# water pump motor frequency signal.

8. An automatically switching non-negative pressure water supply system according to claim 1, wherein: l + pin and M pin of the PLC analog unit U3 are connected with a +24V line and a 0V line, the part is used for a power supply of the PLC analog unit U3, RA pin and A + pin of the PLC analog unit U3 are connected with AI8+ signals, RA-pin of the PLC analog unit U3 is connected with AI 8-signals, the part is used for collecting pressure signals of a pressure stabilizing tank, RB pin and B + pin of the PLC analog unit U3 are connected with AI10+ signals, RB-pin of the PLC analog unit U3 is connected with AI 10-signals, the part is used for collecting pressure signals of tap water, RC pin and C + pin of the PLC analog unit U3 are connected with AI12+ signals, RC-pin of the PLC analog unit U3 is connected with AI 12-signals, and the part is used for collecting water supply signals;

9. An automatically switching non-negative pressure water supply system according to claim 1, wherein: the motor driving module comprises a 1# water pump motor frequency converter T1, a 2# water pump motor frequency converter T2 and a 3# water pump motor frequency converter T3, wherein an R pin, an S pin and a T pin of a 1# water pump motor frequency converter T1 are connected with an L1 wire, an L2 wire and an L3 wire, the R pin, the S pin and the T pin of the 1# water pump motor frequency converter T1 are used for providing power for a 1# water pump motor frequency converter T1, a U pin, a V pin and a W pin of a 1# water pump motor frequency converter T1 are connected with a 1# water pump motor M1, a DI1 pin of the 1# water pump motor frequency converter T1 is connected with one end of an intermediate relay KA1, the other end of the intermediate relay 686KA 9 is connected with a COM pin of a 1# water pump motor frequency converter T1, an AI1 pin of the 1# water pump motor frequency converter T1 is connected with an AQ0+ signal of a PLC analog quantity unit U2, a 1# water pump motor frequency converter T0 pin of a 1# water pump motor frequency converter T1 is connected with an AQ signal of a PLC analog quantity unit U0, and an AI0+ signal of a GND water pump motor AI0, a 2# GND pin of the 1# water pump motor frequency converter T1 is connected with an AI 0-signal of a PLC analog unit U2, and the part is used for driving the 1# water pump motor M1 to operate and controlling the speed and the direction of the operation of the 1# water pump motor M1;

10. An implementation method of an automatic switching non-negative pressure water supply system is characterized in that: the implementation method is applied to the automatically-switched non-negative-pressure water supply system as claimed in any one of claims 1 to 9, and comprises the following steps:

step S102, starting the 2# pneumatic valve, and closing the 1# pneumatic valve and the 3# pneumatic valve; executing step S104;

step S104, starting a No. 2 water pump motor; executing step S105;

step S105, the control system judges whether the water supply pressure meets the water supply requirement; if yes, the process jumps to the process start S101, otherwise, go to step S106;

step S106, starting a 3# water pump motor; jumping to the program starting S101, and repeating the steps;

step S202, starting a 1# water pump motor, closing a 1# pneumatic valve and a 3# pneumatic valve, and opening a 4# pneumatic valve; the program jumps to program start S201;