Automatic chlorination control system

Abstract

The utility model relates to the technical field of water plant control equipment, in particular to an automatic chlorination control system. Comprising a control unit, a matched low-voltage component and a control unit operation panel, the control unit comprises a control unit controller and an upper computer, the control unit controller is connected with a communication module, the upper computer, a relay and a frequency converter circuit, and the frequency converter circuit is electrically connected with the output terminal; and the output terminal is electrically connected with the chlorination metering pump. The system has two operation modes of an operation panel and upper computer operation, the unit feeding amount, the feeding concentration, the raw water flow, the frequency calibration upper and lower limits, the flow relative to the frequency upper and lower limits, the K coefficient and other related parameters can be set through an upper computer picture, and the control system controls the chlorination pump to automatically feed according to the set parameters. Corresponding manual operation can be carried out on the corresponding chlorine adding metering pump through the operation panel. The control system can realize automatic control and accurate dosing of water plant chlorination dosing, saves chemicals, and is low in failure rate and easy to maintain, so that the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water plant control equipment technical field, especially a kind of automatic chlorination control system. BACKGROUND

[0002] In water plant, it is divided into before adding chlorine, after adding chlorine, wherein before adding chlorine is in raw water inlet, mainly according to raw water flow proportion to add, sodium hypochlorite dosage and water flow are directly proportional. Traditional before adding chlorine is sent to PLC by installing raw water flowmeter, and 4-20mA flow signal is formed signal, before adding chlorine is controlled by flow proportion. Actual sodium hypochlorite reagent dosage is related to raw water flow, raw water turbidity, frequency converter frequency, frequency flow ratio, dosage concentration and other complex water quality parameters, and the control mode in front cannot satisfy accurate chlorination. UTILITY MODEL CONTENT

[0003] In order to solve the problems in the above background art, the utility model provides an automatic chlorination control system. The control system can realize automatic control of water plant chlorination, accurate dosage, save reagent, low failure rate and easy maintenance, thereby reducing operating cost.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0005] An automatic chlorination control system, comprising a control unit, a matched low-voltage component, a control unit operation panel, a load circuit and a metering pump. The control unit comprises a control unit controller and an upper computer, and the control unit controller is connected with a communication module, an upper computer, a relay and a frequency converter. The frequency converter is electrically connected to an output terminal, and the output terminal is electrically connected to a metering pump motor.

[0006] The control unit controller is a programmable controller.

[0007] The frequency converter circuit comprises a plurality of load circuits with the same structure.

[0008] The load circuit comprises a running feedback relay K1, a fault feedback relay K2, a local start-stop frequency converter relay K3, a remote control start-stop relay K4, a liquid level protection relay K5, a frequency converter frequency feedback and a frequency converter frequency given value. The K1-K2 relays are the running state output of the frequency converter, which are used as the frequency converter state input signal of the control unit controller. The K3 is a local start-stop button control. The K4 controls the remote start-stop frequency converter of the control unit controller, and controls the input command of the frequency converter. The frequency feedback is sent by the frequency converter, which is used as the analog input signal of the control unit controller. The frequency given value is sent by the control unit controller, which is used as the frequency given value of the frequency converter, and controls the frequency of the frequency converter.

[0009] The operation feedback and the fault feedback signal of the frequency converter are electrically connected with the operation relay K1 and the fault relay K2 respectively, the operation relay K1 and the fault relay K2 are electrically connected with two switch quantity input channels of the controller of the control unit at a normally open point, and are electrically connected with an indicator lamp on an operation panel of the control unit at a normally open point, and are used for displaying the operation state of the frequency converter.

[0010] The controller of the control unit is in communication connection with the upper computer through an Ethernet interface.

[0011] Compared with the prior art, the automatic chlorine adding control system has the advantages that:

[0012] The automatic chlorine adding control system provided by the utility model adopts PLC (programmable controller) distributed control, greatly simplifies the circuit of the control cabinet, has simple structure, and is convenient and fast to assemble and inspect; the failure rate is low, and the system is easy to maintain; the system can realize accurate automatic control of the water plant, saves reagents, and reduces cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the structural diagram of the utility model;

[0014] Figure 2 is the principle diagram of the utility model, and a single adding pump circuit is taken as an example. DETAILED DESCRIPTION

[0015] In order to enable the personnel in the technical field to better understand the purposes and technical schemes of the present application, the technical schemes in the present application will be clearly described in combination with the drawings and embodiments. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Therefore, all the other embodiments obtained by the personnel in the field without creative labor based on the embodiments of the present application belong to the protection scope of the present application.

[0016] As shown in Figure 1 , the control unit comprises a control unit controller and an upper computer, and the control unit controller is in communication connection with the upper computer through an Ethernet interface. The control unit controller is electrically connected with a control unit communication module, the upper computer, a relay, a frequency converter and an output terminal. The frequency converter and the relay circuit are electrically connected with the input and output terminals of the control unit, and the output terminal of the frequency converter is electrically connected with a chlorine adding metering pump. In the embodiment, the load is the chlorine adding metering pump.

[0017] As shown in Figure 1 , the control unit communication module is in Ethernet communication connection with the upper computer, so that the communication connection between the control unit and the upper computer is realized.

[0018] As shown in Figure 1As shown, the control unit communication module is connected to the water plant main system communication module via Ethernet, thereby realizing the communication connection between the control unit and the water plant main system.

[0019] like Figure 1 As shown, in this embodiment, the control unit controller is preferably a programmable logic controller (PLC). The host computer has configuration software installed that can communicate with the controller, thereby enabling centralized monitoring and control of the chlorination metering pump on the host computer.

[0020] like Figure 1 As shown, the control unit's operation panel includes a "local / remote" control switch, control buttons, and indicator lights. The "local / remote" control switch is used to switch between local and remote control. Local control involves using the control buttons on the operation panel to turn each inverter on or off, while remote control involves the host computer controlling the inverters on or off. The indicator lights indicate the inverter's operating status. The "local / remote" control switch and control buttons on the operation panel are electrically connected to the control unit's relay circuit. The control buttons in the host computer configuration software are soft buttons and do not require hardware wiring.

[0021] like Figure 2 As shown, the control unit relay circuit includes multiple load circuits with the same structure. Each load circuit corresponds to one frequency converter. Since the structure of each load circuit is the same, only the schematic diagram of one load circuit is shown in the attached figure. The schematic diagrams of other load circuits are omitted here.

[0022] like Figure 2 As shown, the load circuit includes a running feedback relay K1, a fault feedback relay K2, a local start / stop inverter relay K3, a remote control start / stop relay K4, a level protection relay K5, inverter frequency feedback, and inverter frequency setpoint. Relays K1-K2 output the inverter's operating status, serving as the inverter status input signal to the control unit controller. K3 controls the on-board start / stop button, and K4 controls the remote start / stop of the inverter via the control unit controller, providing input commands to the inverter. The frequency feedback is issued by the inverter and serves as the analog input signal to the control unit controller. The frequency setpoint is issued by the control unit controller and serves as the frequency setpoint for the inverter, controlling its frequency. The inverter's running feedback and fault feedback signals are electrically connected to running relay K1 and fault relay K2, respectively. One normally open contact of running relay K1 and fault relay K2 is electrically connected to two digital input channels of the control unit controller, and another normally open contact is connected to an indicator light on the control unit's operation panel to display the inverter's operating status.

[0023] Start: when the start-stop button on the host computer or operation board is turned on, the output channel of the controller for controlling the frequency converter outputs a signal, the coil of the start-stop relay K3 is electrified, the normally open contact of the start-stop relay K3 is closed, the frequency converter receives the start command, the metering pump starts, when the frequency converter receives the 4-20mA frequency given signal sent by the controller unit, the frequency converter runs at a uniform speed according to the given frequency, until the given frequency of the frequency converter is consistent with the frequency feedback signal, the start process of the chlorination metering pump is completed.

[0024] Stop: when the stop button on the host computer or operation board is turned on, the output channel of the controller for controlling the frequency converter outputs a signal, the coil of the start-stop relay K3 is de-energized, the normally open contact of the start-stop relay K3 is opened, the frequency converter receives the stop command, the frequency converter starts to run at a reduced frequency, when the feedback frequency is reduced to 0HZ, the frequency converter stops working, and the chlorination metering pump stops.

[0025] The automatic chlorination control system has the advantages of simple structure, convenient and fast assembly and quality inspection, low failure rate in use, easy maintenance, and automatic control of chlorination addition in a water plant.

[0026] Although the embodiments of the application have been shown and described, the above embodiments are preferred embodiments of the application, and the embodiments of the application are not limited to the above embodiments. Changes, modifications, substitutions, combinations and simplifications made by those of ordinary skill in the art without departing from the principles and spirit of the application should be equivalent replacement methods, and are all included in the protection scope of the application.

Claims

1. An automatic chlorination control system characterized by, The control unit comprises a control unit controller and an upper computer, the control unit controller is connected with a communication module, the upper computer, a relay and a frequency converter, the frequency converter is electrically connected with an output terminal, and the output terminal is electrically connected with a metering pump motor.

2. An automatic chlorination control system according to claim 1, wherein The control unit controller is a programmable controller.

3. An automatic chlorination control system according to claim 1, wherein The relay circuit comprises a plurality of load circuits with the same structure.

4. An automatic chlorination control system according to claim 1, wherein The load circuit comprises a running feedback relay K1, a fault feedback relay K2, a local start-stop frequency converter relay K3, a remote control start-stop relay K4, a liquid level protection relay K5, a frequency feedback of the frequency converter and a frequency given of the frequency converter, the K1-K2 relays are the running state outputs of the frequency converter and are used as the frequency converter state input signals of the control unit controller, the K3 is a local start-stop button control, the K4 is a remote start-stop frequency converter control unit controller, and the frequency feedback is sent by the frequency converter and is used as the analog input signal of the control unit controller, the frequency given is sent by the control unit controller and is used as the frequency given of the frequency converter, and the frequency of the frequency converter is controlled.

5. An automatic chlorination control system according to claim 1, wherein The running feedback and the fault feedback signals of the frequency converter are electrically connected with the running feedback relay K1 and the fault feedback relay K2 respectively, one-way normally open points of the running feedback relay K1 and the fault feedback relay K2 are electrically connected with two-way on-off quantity input channels of the control unit controller and are electrically connected with indicator lamps on the control unit operation panel, and the indicator lamps are used for displaying the running state of the frequency converter.

6. An automatic chlorination control system according to claim 1, wherein The control unit controller and the upper computer are connected through an Ethernet interface.

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