Vacuum drinking water equipment control system for water plant

Abstract

The utility model relates to waterworks water supply automation control technical field especially, a kind of vacuum drinking water equipment control system equipment for waterworks is provided.The utility model discloses a vacuum pump control unit, including vacuum pump, for providing vacuum power for vacuum drinking water process;Electric valve control unit, including the electric valve connected with vacuum system pipeline, for controlling the on-off of pipeline;The PLC control unit includes main controller and at least one extension module, the extension module is used to extend digital quantity input output channel, the main controller is connected with the extension module, to gather the input signal of man-machine interaction unit, and output control signal to electric valve relay, alternating current contactor.Realize the timing automatic control of vacuum pump and electric valve, support multi-mode switching, and have the control system of real-time state monitoring, improve the operation efficiency and stability of waterworks vacuum drinking water equipment.

Description

Technical Field

[0001] This utility model relates to the field of water plant water supply automation control technology, and in particular to a control system for a vacuum drinking water equipment used in water plants. Background Technology

[0002] During the operation of vacuum drinking water equipment in water plants, the start-up and shutdown of the vacuum pump and the opening and closing of the electric valve must strictly follow the preset timing sequence to ensure vacuum formation efficiency and water supply stability. Traditional vacuum drinking water equipment control systems mostly rely on manual operation, which has the following key technical problems: First, the degree of automation is low. The start-up and shutdown of the vacuum pump and the opening and closing of the electric valve require manual operation one by one, which cannot achieve time-sequential automatic control. This is not only cumbersome to operate, but also prone to timing errors due to human operation, which can affect the vacuum formation effect. Second, the control mode is singular, lacking the ability to flexibly switch between manual, semi-automatic, and fully automatic modes, making it difficult to adapt to the operating needs of different scenarios. Third, equipment status monitoring and fault response are lagging behind. Abnormal states such as vacuum pump overload need to be detected by manual inspection, which cannot provide timely feedback and trigger protection actions, posing a risk of equipment damage.

[0003] Therefore, a control system is needed that can realize sequential automatic control of vacuum pumps and electric valves, support multi-mode switching, and have real-time status monitoring, in order to solve the drawbacks of traditional control methods and improve the operating efficiency and stability of vacuum drinking water equipment in water plants. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a control system for a vacuum drinking water equipment used in water plants.

[0005] This utility model provides a control system for a vacuum drinking water equipment used in water plants, comprising: A vacuum pump control unit, including a vacuum pump, is used to provide vacuum power for the vacuum drinking process; An electric valve control unit, including an electric valve connected to a vacuum system pipeline, for controlling the opening and closing of the pipeline; The human-machine interface unit is used to input control commands and provide feedback on the equipment's operating status signals. The PLC control unit is connected to the vacuum pump, electric valve, and human-machine interface unit respectively. The PLC control unit includes a main controller and at least one expansion module. The expansion module is used to expand the digital input / output channels. The main controller is connected to the expansion module to collect the input signals of the human-machine interface unit and output control signals to the electric valve relay and AC contactor. The power supply unit is electrically connected to the vacuum pump control unit, electric valve control unit, PLC control unit, and human-machine interface unit to provide power.

[0006] Furthermore, the electric valve relay is connected to the electric valve, and the expansion module outputs a control signal to the electric valve relay to control the opening and closing of the electric valve. The AC contactor is connected to the vacuum pump, and the expansion module of the PLC control unit outputs a control signal to the AC contactor to control the start and stop of the vacuum pump. The expansion module of the PLC control unit outputs a control signal to an indicator light, which is used to display the operating status of the vacuum pump and the electric valve.

[0007] Furthermore, the vacuum pump control unit includes a vacuum pump main circuit and a vacuum pump control circuit. The vacuum pump control circuit includes a button, a selector switch, and a vacuum pump relay connected in sequence. The contacts of the vacuum pump relay are used to control the on / off state of the AC contactor coil to realize the manual start and stop of the vacuum pump. The vacuum pump relay is connected to the PLC control unit and receives the control signal output by the PLC to realize the automatic start and stop of the vacuum pump.

[0008] Furthermore, the main circuit of the vacuum pump includes a main power circuit breaker, a branch circuit breaker, an AC contactor, a thermal relay, and a vacuum pump motor connected in sequence. The thermal relay is connected to the PLC control unit and is used to detect the overload signal of the vacuum pump motor and feed the overload signal back to the PLC control unit. The PLC control unit outputs a cut-off signal to cut off the vacuum pump control circuit and drives the overload indicator light to activate.

[0009] Furthermore, the electric valve control unit includes at least one electric valve and an electric valve control circuit. The electric valve control circuit includes an electric valve relay, which is connected to the PLC control unit. The PLC control unit outputs a control signal to the electric valve relay, and the contacts of the electric valve relay are connected to the electric valve to control the opening and closing of the electric valve.

[0010] Furthermore, the electric valve includes a pump inlet valve, a pump drain valve, and a vacuum tank sealing fluid electric valve. The PLC control unit outputs a control signal to the pump inlet valve relay corresponding to the pump inlet valve to control the opening and closing of the pump inlet valve, thereby achieving air intake control during the vacuuming process. The PLC control unit outputs a control signal to the pump drain valve relay corresponding to the pump drain valve to control the opening and closing of the pump drain valve, thereby achieving drainage control during the vacuuming process. The PLC control unit outputs a control signal to the sealing fluid electric valve relay corresponding to the vacuum tank sealing fluid electric valve to control the opening and closing of the vacuum tank sealing fluid electric valve, thereby achieving on / off control of the vacuum tank sealing fluid.

[0011] Furthermore, the human-machine interface unit includes a touch screen and operating elements. The touch screen is connected to the PLC control unit and is used to output control mode commands, including manual mode commands, semi-automatic mode commands, and fully automatic mode commands. The touch screen is used to display the operating status of the vacuum pump and the electric valve.

[0012] Furthermore, the operating element includes a knob and a button. The operating element is connected to the expansion module of the PLC control unit. In manual mode, the vacuum pump start / stop command and electric valve open / close command sent by the operating element are transmitted to the main controller via the expansion module. The main controller outputs corresponding control signals to the AC contactor or electric valve relay to realize manual control of the vacuum pump and electric valve.

[0013] Furthermore, the power supply unit includes an AC-DC power module, which is connected to the PLC control unit, the electric valve relay, and the indicator light. It is used to convert AC220V power to DC24V power for power supply. The AC220V output terminal of the power supply unit is connected to the vacuum pump main circuit and the electric valve control circuit to supply power to the AC components.

[0014] Furthermore, the PLC control unit is also connected to an indicator light control unit, which receives signals from the PLC control unit and displays the pump vacuuming, pump drainage, electric valve opening and closing, and equipment overload status.

[0015] In summary, this utility model has the following beneficial technical effects: 1. This utility model realizes the time-sequential automatic control of vacuum pumps and electric valves, improving control accuracy and operating efficiency. The main controller and expansion modules of the PLC control unit collect command signals and output control signals to the electric valve relays and AC contactors, respectively controlling the opening and closing sequence of the electric valves and the start and stop of the vacuum pump. Specifically, the electric valves are subdivided into the vacuum pump inlet valve, the vacuum pump drain valve, and the vacuum tank sealing fluid electric valve, with corresponding relays achieving targeted time-sequential control. This solves the problems of cumbersome operation and incorrect timing caused by traditional manual control.

[0016] 2. This utility model supports flexible switching between multiple control modes, adapting to different operating scenarios. The touchscreen of the human-machine interface unit can output manual, semi-automatic, and fully automatic control mode commands. The operating element connects to the PLC expansion module to achieve equipment control in manual mode. In semi-automatic mode, the vacuuming sequence is automatically executed with a one-button command. In fully automatic mode, the PLC automatically completes the control process according to preset logic, without manual intervention. This design solves the drawback of the single control mode of traditional control systems, allowing flexible switching according to different scenarios such as equipment debugging, daily operation, and emergency handling, thus improving the system's applicability.

[0017] 3. This utility model displays the real-time operating status of the pump vacuuming and electric valve opening and closing, and the touch screen synchronously feeds back the equipment operating information, making it easy for operators to keep track of the system status in real time; after the thermal relay of the vacuum pump main circuit detects the motor overload signal, it feeds back to the PLC control unit. The PLC outputs a cut-off signal in time to disconnect the control circuit and drives the overload indicator light to activate, realizing rapid response and protection against faults. This solves the risk of equipment damage caused by the lag in status monitoring and untimely fault handling in traditional systems. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the vacuum pump electric valve control circuit and terminal block according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the indicator light control principle according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the electric valve control circuit according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the main circuit of the vacuum pump according to an embodiment of the present invention.

[0022] Figure 5 This is a wiring diagram of the PLC digital input module according to an embodiment of this utility model. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Example 1 Reference Figure 1 and Figure 5 The control system for a vacuum drinking water equipment used in a water plant according to this embodiment includes: A vacuum pump control unit, including a vacuum pump, is used to provide vacuum power for the vacuum drinking process; An electric valve control unit, including an electric valve connected to a vacuum system pipeline, for controlling the opening and closing of the pipeline; The human-machine interface unit is used to input control commands and provide feedback on the equipment's operating status signals. The PLC control unit is connected to the vacuum pump, electric valve, and human-machine interface unit respectively. The PLC control unit includes a main controller and at least one expansion module. The expansion module is used to expand the digital input / output channels. The main controller is connected to the expansion module to collect the input signals of the human-machine interface unit and output control signals to the electric valve relay and AC contactor. It is electrically connected to the vacuum pump control unit, electric valve control unit, PLC control unit, and human-machine interface unit to provide power.

[0025] The main circuit of the vacuum pump is sequentially connected to the main power circuit breaker QF1, branch circuit breakers QF2 and QF3, AC contactors KM1 and KM2, thermal relays KH1 and KH2, and vacuum pump motors (vacuum pump #1 and vacuum pump #2). Thermal relays KH1 and KH2 are connected to the PLC control unit to detect overload signals from the vacuum pump motors and feed these signals back to the PLC control unit. The PLC control unit outputs a cut-off signal to disconnect the vacuum pump control circuit and activates the overload indicator light. The vacuum pump control circuit is sequentially connected to buttons (SF1 and SF2), a selector switch SA1, and vacuum pump relays (KA25 and KA26). The contacts of the vacuum pump relays control the on / off state of the coils of AC contactors KM1 and KM2 to achieve manual start and stop of the vacuum pump. The vacuum pump relays are also connected to the PLC control unit to receive control signals from the PLC to achieve automatic start and stop of the vacuum pump.

[0026] The electric valve control unit includes at least one electric valve and an electric valve control circuit. The electric valve control circuit is equipped with electric valve relays (KA13, KA14, KA15, KA16, KA29). The electric valve relays are connected to the PLC control unit. The PLC control unit outputs control signals to the electric valve relays. The contacts of the electric valve relays are connected to the electric valves to control the opening and closing of the electric valves. The electric valves include M1 (inlet valve of pump #1), M2 (outlet valve of pump #1), M3 (inlet valve of pump #2), M4 (outlet valve of pump #2), M5 (inlet valve of pump #3), M6 (outlet valve of pump #3), M7 (inlet valve of pump #4), M8 (outlet valve of pump #4), and M21 (electric valve for vacuum tank sealing fluid). The PLC control unit outputs control signals to the pump inlet valve relay KA13 corresponding to M1 to control the opening and closing of the pump inlet valve, realizing air intake control during the vacuuming process; outputs control signals to the pump outlet valve relay KA14 corresponding to M2 to control the opening and closing of the pump outlet valve, realizing drainage control during the vacuuming process; and outputs control signals to the sealing fluid electric valve relay KA29 corresponding to M21 to control the opening and closing of the vacuum tank sealing fluid electric valve, realizing on / off control of the vacuum tank sealing fluid.

[0027] The human-machine interface unit includes a touchscreen and operating elements. The touchscreen is an industrial-grade touchscreen with existing programming logic, used to achieve functions such as control mode switching, equipment status display, and control command input. It is connected to the PLC control unit to output control mode commands, including manual mode commands, semi-automatic mode commands, and fully automatic mode commands, and to display the operating status of the vacuum pump and electric valve. The operating elements include knobs and buttons, and are connected to the expansion module of the PLC control unit. In manual mode, the vacuum pump start / stop commands and electric valve open / close commands sent by the operating elements are transmitted to the main controller via the expansion module. The main controller outputs corresponding control signals to the AC contactor or electric valve relay to achieve manual control of the vacuum pump and electric valve.

[0028] The PLC control unit includes a main controller, model S7-200SMARTCPUSR20, and at least one expansion module, model 6ES7223-1PL22-0XA0 or 6ES7221-1PL21-0XA0. The expansion module is used to expand digital input / output channels. The main controller is connected to the expansion module to collect input signals from the human-machine interface unit, such as buttons, knobs, pressure signals, etc., and output control signals to electric valve relays and AC contactors.

[0029] The power supply unit includes an AC-DC power module, which has L, N, and PE input terminals and DC24V output terminals (V+, V-). The AC-DC power module is connected to the PLC control unit, electric valve relay, and indicator lights to convert AC220V power to DC24V power for supply. The AC220V output terminal of the power supply unit is connected to AC components such as the circuit breaker and AC contactor of the vacuum pump main circuit and the AC relay of the electric valve control circuit to supply power to the AC components.

[0030] The electric valve relay is connected to the electric valve, and the expansion module outputs control signals to the electric valve relay to control the opening and closing of the electric valve. The AC contactor is connected to the vacuum pump, and the expansion module of the PLC control unit outputs control signals to the AC contactor to control the start and stop of the vacuum pump. The expansion module of the PLC control unit outputs control signals to indicator lights, which are used to display the operating status of the vacuum pump and the electric valve. The indicator light control unit includes multiple status indicator lights (SA1-SA16), such as SA1 for vacuuming pump #1, SA3 for draining pump #1, SA14 for the vacuum tank inlet valve being open, and SA13 for overload of pump #1. Each indicator light is connected to the power supply circuit through intermediate relay contacts, such as KA1-1-35, KA2-1-37, KA19-35, and KA27-39. Signals output from the PLC control unit or manual control circuit drive the intermediate relays to activate, thereby illuminating the corresponding indicator light and visually displaying the equipment's operating status.

[0031] Reference Figure 3 The electric valve relay is connected to the electric valve, and the expansion module outputs control signals to the electric valve relay to control the opening and closing of the electric valve. The AC contactor is connected to the vacuum pump, and the expansion module of the PLC control unit outputs control signals to the AC contactor to control the start and stop of the vacuum pump. The expansion module of the PLC control unit outputs control signals to the indicator light, which is used to display the operating status of the vacuum pump and the electric valve.

[0032] The vacuum pump control unit includes a vacuum pump main circuit and a vacuum pump control circuit. The vacuum pump control circuit includes a button, a selector switch, and a vacuum pump relay connected in sequence. The contacts of the vacuum pump relay are used to control the on / off state of the AC contactor coil to realize the manual start and stop of the vacuum pump. The vacuum pump relay is connected to the PLC control unit and receives the control signal output by the PLC to realize the automatic start and stop of the vacuum pump.

[0033] Reference Figure 4 The main circuit of the vacuum pump includes a main power circuit breaker, a branch circuit breaker, an AC contactor, a thermal relay, and a vacuum pump motor connected in sequence. The thermal relay is connected to the PLC control unit and is used to detect the overload signal of the vacuum pump motor and feed the overload signal back to the PLC control unit. The PLC control unit outputs a cut-off signal to cut off the vacuum pump control circuit and drives the overload indicator light to activate.

[0034] The electric valve control unit includes at least one electric valve and an electric valve control circuit. The electric valve control circuit includes an electric valve relay, which is connected to the PLC control unit. The PLC control unit outputs a control signal to the electric valve relay, and the contacts of the electric valve relay are connected to the electric valve to control the opening and closing of the electric valve.

[0035] Reference Figure 3 The electric valve includes a pump inlet valve, a pump drain valve, and a vacuum tank sealing fluid electric valve. The PLC control unit outputs a control signal to the pump inlet valve relay corresponding to the pump inlet valve to control the opening and closing of the pump inlet valve, thereby achieving air intake control during the vacuuming process. The PLC control unit outputs a control signal to the pump drain valve relay corresponding to the pump drain valve to control the opening and closing of the pump drain valve, thereby achieving drainage control during the vacuuming process. The PLC control unit outputs a control signal to the sealing fluid electric valve relay corresponding to the vacuum tank sealing fluid electric valve to control the opening and closing of the vacuum tank sealing fluid electric valve, thereby achieving on / off control of the vacuum tank sealing fluid.

[0036] The human-machine interface unit includes a touch screen and operating elements. The touch screen is connected to the PLC control unit and is used to output control mode commands, including manual mode commands, semi-automatic mode commands, and fully automatic mode commands. The touch screen is used to display the operating status of the vacuum pump and electric valve.

[0037] The operating element includes a knob and a button. The operating element is connected to the expansion module of the PLC control unit. In manual mode, the vacuum pump start / stop command and electric valve open / close command sent by the operating element are transmitted to the main controller via the expansion module. The main controller outputs the corresponding control signal to the AC contactor or electric valve relay to realize the manual control of the vacuum pump and electric valve.

[0038] Reference Figure 3 The power supply unit includes an AC-DC power module, which is connected to the PLC control unit, electric valve relay, and indicator lights. It is used to convert AC220V power to DC24V power for power supply. The AC220V output terminal of the power supply unit is connected to the vacuum pump main circuit and the electric valve control circuit to supply power to the AC components.

[0039] Reference Figure 2 The PLC control unit is also connected to an indicator light control unit, which is used to receive signals from the PLC control unit and display the pump vacuuming, pump drainage, electric valve opening and closing, and equipment overload status.

[0040] Workflow: Power-on initialization process: Close the AC220V main power supply of the power unit and each branch circuit breaker. The power module outputs DC24V to power the PLC control unit, DC intermediate relay, indicator lights, etc. The PLC control unit completes self-test, the power indicator light and PLC running indicator light are lit, the touch screen initialization is completed and the main interface is displayed.

[0041] Control mode selection process: Maintenance personnel select manual, semi-automatic or fully automatic control modes through the touch screen or operating elements of the human-machine interface unit. The mode selection signal is transmitted to the PLC control unit.

[0042] Command execution and equipment control process: In manual mode, the commands sent by the operating elements are acquired by the PLC expansion module, and the main controller outputs control signals to drive the AC contactor and electric valve relay to start and stop the vacuum pump and open and close the electric valve. At the same time, the indicator light control unit displays the equipment status in real time.

[0043] In semi-automatic mode, the one-click vacuuming command sent by the touch screen is transmitted to the PLC via the communication interface. The PLC outputs control signals according to the preset timing sequence, which sequentially controls the electric valve and vacuum pump to operate. After completing the vacuuming, the status is fed back to the touch screen.

[0044] In fully automatic mode, the PLC automatically outputs control signals based on the vacuum system pressure signal or the water pump start-up requirements, driving the electric valve and vacuum pump to operate according to preset logic, thus achieving a vacuuming process without human intervention.

[0045] Status monitoring and fault handling process: The indicator light control unit displays the equipment operating status in real time; if the vacuum pump is overloaded, the thermal relay will activate and send a signal to the PLC. The PLC will output a signal to cut off the vacuum pump control circuit and simultaneously drive the overload indicator light to illuminate, prompting maintenance personnel to troubleshoot and handle the fault.

[0046] Operating steps: I. Manual mode operation steps (taking pump #1 for vacuuming as an example) Close the main power circuit breaker QF1 of the power supply unit, as well as the vacuum pump branch circuit breaker QF2 and the electric valve control circuit breaker.

[0047] Observe the power indicator light (green) on the PLC control unit and the touch screen display to confirm that the system power supply and initialization are normal.

[0048] Set the manual / automatic switching knob of the human-computer interaction unit to "manual" mode.

[0049] When the "1# Pump Vacuum Knob" is turned to the "On" position, the PLC will collect the instruction and output a control signal to the electric valve relay (such as KA13) corresponding to the 1# Pump intake valve, driving the 1# Pump intake valve M1 to open, and the indicator light SA1 will light up at the same time.

[0050] Operate the "vacuum tank inlet valve knob" to the "open" position. The PLC outputs a signal to the corresponding relay, driving the vacuum tank inlet valve to open, and the indicator light SA14 lights up.

[0051] Press the "1# Vacuum Pump Start Button" to send a signal from the PLC to the coil of the AC contactor KM1. The main contacts of KM1 will close, the 1# vacuum pump motor will start, and the running indicator light HR1 will illuminate. If the vacuuming speed is insufficient, press the "2# Vacuum Pump Start Button" to energize the coil of KM2 and start the 2# vacuum pump.

[0052] When the touch screen displays "Vacuum formed for pump #1" (pressure switch signal feedback to PLC), operate the "vacuum knob for pump #1" to the "off" position. After a 15-second delay, operate the "vacuum tank inlet valve knob" to the "off" position, and then press the "vacuum pump stop button". The KM1 and KM2 coils will be de-energized, and the vacuum pump will stop running.

[0053] II. Semi-automatic mode operation steps (taking one-button vacuuming of pump #1 as an example) After powering on and initializing, switch the manual / automatic mode switch to "semi-automatic" mode.

[0054] Click the "One-click vacuuming of pump #1" button on the touch screen, and the touch screen sends a command to the PLC (the command transmission logic is existing technology).

[0055] After receiving the instruction, the PLC outputs control signals according to the preset timing sequence: The relay controlling the intake valve of pump #1 is activated, and M1 opens; The relay controlling the vacuum tank's air inlet valve activates, opening the air inlet valve. When the KM1 coil is energized, vacuum pump #1 starts; if a vacuum is not formed within 6 minutes, the PLC outputs a signal to energize the KM2 coil, and vacuum pump #2 starts.

[0056] When the pressure switch detects the vacuum formation signal and feeds it back to the PLC, the PLC outputs a signal after a 30-second delay to close the air inlet valve of pump #1 and the air inlet valve of the vacuum tank. After another 25-second delay, it outputs a signal to de-energize coils KM1 and KM2, stopping the vacuum pump, completing the vacuuming process, and the touch screen displays the completion status.

[0057] III. Fully Automatic Mode Operation Steps After powering on and initializing, switch the manual / automatic mode switch to "fully automatic" mode.

[0058] When the water plant needs to start the No. 1 water supply pump, the pump start signal (input from the pump control circuit or touch screen) is transmitted to the PLC.

[0059] The PLC automatically triggers the vacuuming sequence: the electric valve and vacuum pump operate in the same sequence as in the semi-automatic mode. After the vacuuming is completed, the No. 1 water supply pump is automatically allowed to start, and the status is fed back to the touch screen.

[0060] After the water pump starts, the PLC receives the water pump operation signal and automatically controls the No. 1 pump vacuum tank drain valve to open, drain for 25 seconds and then close, completing the drainage process.

[0061] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A control system for a vacuum drinking water equipment used in a water plant, characterized in that, include: A vacuum pump control unit, including a vacuum pump, is used to provide vacuum power for the vacuum drinking process; An electric valve control unit, including an electric valve connected to a vacuum system pipeline, for controlling the opening and closing of the pipeline; The human-machine interface unit is used to input control commands and provide feedback on the equipment's operating status signals. The PLC control unit is connected to the vacuum pump, electric valve, and human-machine interface unit respectively. The PLC control unit includes a main controller and at least one expansion module. The expansion module is used to expand the digital input / output channels. The main controller is connected to the expansion module to collect the input signals of the human-machine interface unit and output control signals to the electric valve relay and AC contactor. The power supply unit is electrically connected to the vacuum pump control unit, electric valve control unit, PLC control unit, and human-machine interface unit to provide power.

2. The control system for vacuum drinking water equipment in water plants according to claim 1, characterized in that, The electric valve relay is connected to the electric valve, and the expansion module outputs control signals to the electric valve relay to control the opening and closing of the electric valve. The AC contactor is connected to the vacuum pump, and the expansion module of the PLC control unit outputs control signals to the AC contactor to control the start and stop of the vacuum pump. The expansion module of the PLC control unit outputs control signals to the indicator light, which is used to display the operating status of the vacuum pump and the electric valve.

3. The control system for vacuum drinking water equipment in water plants according to claim 2, characterized in that, The vacuum pump control unit includes a vacuum pump main circuit and a vacuum pump control circuit. The vacuum pump control circuit includes a button, a selector switch, and a vacuum pump relay connected in sequence. The contacts of the vacuum pump relay are used to control the on / off state of the AC contactor coil to realize the manual start and stop of the vacuum pump. The vacuum pump relay is connected to the PLC control unit and receives the control signal output by the PLC to realize the automatic start and stop of the vacuum pump.

4. The control system for vacuum drinking water equipment in water plants according to claim 3, characterized in that, The main circuit of the vacuum pump includes a main power circuit breaker, a branch circuit breaker, an AC contactor, a thermal relay, and a vacuum pump motor connected in sequence. The thermal relay is connected to the PLC control unit and is used to detect the overload signal of the vacuum pump motor and feed the overload signal back to the PLC control unit. The PLC control unit outputs a cut-off signal to cut off the vacuum pump control circuit and drives the overload indicator light to activate.

5. The control system for vacuum drinking water equipment in water plants according to claim 4, characterized in that, The electric valve control unit includes at least one electric valve and an electric valve control circuit. The electric valve control circuit includes an electric valve relay, which is connected to the PLC control unit. The PLC control unit outputs a control signal to the electric valve relay, and the contacts of the electric valve relay are connected to the electric valve to control the opening and closing of the electric valve.

6. The control system for vacuum drinking water equipment in water plants according to claim 5, characterized in that, The electric valves include a pump inlet valve, a pump drain valve, and a vacuum tank sealing fluid electric valve. The PLC control unit outputs control signals to the pump inlet valve relay corresponding to the pump inlet valve to control the opening and closing of the pump inlet valve, thereby achieving air intake control during the vacuuming process. The PLC control unit outputs control signals to the pump drain valve relay corresponding to the pump drain valve to control the opening and closing of the pump drain valve, thereby achieving drainage control during the vacuuming process. The PLC control unit outputs control signals to the sealing fluid electric valve relay corresponding to the vacuum tank sealing fluid electric valve to control the opening and closing of the vacuum tank sealing fluid electric valve, thereby achieving on / off control of the vacuum tank sealing fluid.

7. The control system for vacuum drinking water equipment in water plants according to claim 6, characterized in that, The human-machine interface unit includes a touch screen and operating elements. The touch screen is connected to the PLC control unit and is used to output control mode commands, including manual mode commands, semi-automatic mode commands, and fully automatic mode commands. The touch screen is used to display the operating status of the vacuum pump and electric valve.

8. The control system for vacuum drinking water equipment in water plants according to claim 7, characterized in that, The operating element includes a knob and a button. The operating element is connected to the expansion module of the PLC control unit. In manual mode, the vacuum pump start / stop command and electric valve open / close command sent by the operating element are transmitted to the main controller via the expansion module. The main controller outputs the corresponding control signal to the AC contactor or electric valve relay to realize the manual control of the vacuum pump and electric valve.

9. The control system for vacuum drinking water equipment in water plants according to claim 8, characterized in that, The power supply unit includes an AC-DC power module, which is connected to the PLC control unit, electric valve relay, and indicator lights. It is used to convert AC220V power to DC24V power for power supply. The AC220V output terminal of the power supply unit is connected to the vacuum pump main circuit and the electric valve control circuit to supply power to the AC components.

10. The control system for vacuum drinking water equipment in water plants according to claim 9, characterized in that, The PLC control unit is also connected to an indicator light control unit, which receives signals from the PLC control unit and displays the pump vacuuming, pump drainage, electric valve opening and closing, and equipment overload status.

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