Automatic water replenishing system and method for clean water tank

Abstract

The invention discloses an automatic water replenishing system and method for a clean water tank, relates to the technical field of water level control, and aims to solve the problem that the water replenishing of the clean water tank needs manual operation and valve control and water supply pressure control, the automatic water replenishing system comprises the clean water tank and a water supply pipeline, and further comprises a collection module arranged in the clean water tank and the water supply pipeline, detecting the liquid level of a clean water tank and pipe network pressure; the control module is electrically connected with the regulating valve at the front end of the clean water tank and controls the opening degree of the regulating valve according to the liquid level of the clean water tank and the pipe network pressure; the detection module detects whether the detection acquisition module fails or not and detects the liquid level state of the clean water tank and the pressure state of a pipe network; the interaction module interacts with the control module, sets system working parameters and displays information acquired by the acquisition module and the detection module; according to the automatic water supplementing system for the clean water tank of the water plant, the opening degree of the valve is controlled through differential pressure change PID adjustment, accurate pressure and liquid level control and monitoring can be achieved, when water used by a user changes, the valve can be automatically adjusted to guarantee the pressure of a pipe network, automatic water supplementing of the clean water tank is achieved, manual adjustment is not needed, and the labor cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of water level control, and in particular to an automatic water replenishment system and method for a clean water tank. Background Art

[0002] The clear water tank is a water tank for storing purified water in the water plant to adjust the difference between the water production and water supply of the water plant, and to meet the chlorination contact time. It has the function of peak water supply and low-peak water storage. It is set in the water supply system to adjust the uniform water supply of the water plant and meet the uneven water use of users. In the prior art, when the clear water tank of the water plant is used for water supply peak regulation, water is directly replenished from the urban water supply pipeline. The municipal supervisor divides a first-level pipeline to the water plant, and the first-level pipeline divides two diode channels to the clear water tank. Electric valves are respectively installed on the two diode channels to control the on and off of the diode channels. However, since the electric valves of the two diode channels are controlled and fed back by switch quantity signals, the process opening cannot be controlled and fed back. At the peak of water use, the full opening of the electric valve will cause the main water supply pipeline to release pressure, affecting the water supply pressure of the front-end users; and the two clear water tanks cannot be fully filled when the water is fully replenished during the low-peak period at night, affecting the stability of the water supply system. Therefore, the two diode channels need to be controlled by manual operation on site by staff 24 hours a day.

[0003] The existing automatic water replenishment system is generally set to automatically control according to the water level, which cannot take into account the user's water pressure and is difficult to adapt to the water supply needs of the water plant. For example, there is a Chinese patent with a publication number of CN102966143A, which provides an automatic water replenishment system for a water pool, including an electric control valve arranged on the water supply pipeline of the tap water; a water pump arranged in the water source; a water level sensor for collecting the water level signal in the water pool, the water level sensor is arranged in the water pool; and a water level controller for controlling the operation of the electric control valve and the water pump according to the water level signal; the water level controller is electrically connected to the water level sensor, the water pump and the electric control valve. This patent controls the operation of the electric control valve and the water pump through the water level controller to automatically replenish the water pool, and can automatically control the amount of water in the water pool to prevent the amount of water in the water pool from being too large or too small. However, this patent does not take into account the control problem of the pipe network pressure and cannot guarantee the water pressure at the user end. Summary of the invention

[0004] In order to solve the problem that water replenishment in a clear water tank requires manual supervision and water supply pressure control, the present invention proposes an automatic water replenishment system and method for a clear water tank, which adopts pressure difference change PID regulation to control the valve opening, and can achieve precise pressure and liquid level control and monitoring. The regulating valve automatically adjusts the opening according to the change of user water use to achieve automatic water replenishment of the clear water tank, which does not affect the water pressure of the user's water use, and can ensure the stability of the water supply system, and does not require manual adjustment, saving labor costs.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: an automatic water replenishment system for a clean water tank, comprising a clean water tank and a water supply pipeline, and also comprising: A collection module is arranged in the clean water tank and the water supply pipeline to detect the liquid level of the clean water tank and the pressure of the pipe network; A control module is electrically connected to the regulating valve at the front end of the clean water tank, and controls the opening of the regulating valve according to the liquid level of the clean water tank and the pressure of the pipe network; Detection module, detects whether the acquisition module is faulty, detects the liquid level status of the clean water tank and the pressure status of the pipe network; The interactive module interacts with the control module, sets system operating parameters, and displays the information obtained by the acquisition module and the detection module.

[0006] In the present technical solution, the automatic water replenishment system for the clear water tank includes a control module and a regulating valve electrically connected to the control module. The regulating valve is arranged at the front end of the clear water tank. The control module can control the opening of the regulating valve. The control module is connected to a collection module. The collection module is provided with a pressure sensor and a liquid level sensor, which can detect the liquid level of the clear water tank and the pressure of the pipe network. The opening of the regulating valve is automatically adjusted by using a controller and a sensor, and the water replenishment of the clear water tank is completed at the fastest speed while ensuring the water pressure of the user.

[0007] The present invention is further configured as follows: the acquisition module includes: The proximal pressure sensor is installed at one end of the water supply pipeline close to the clean water tank to detect the pipe network pressure; A liquid level sensor is arranged in the clean water tank to detect the change of the liquid level in the clean water tank; The position sensor is arranged in the regulating valve to detect the opening of the regulating valve and feed back to the control module.

[0008] In this technical solution, a proximal pressure sensor and a distal pressure sensor are respectively arranged at the proximal and distal ends of the water supply network. The proximal pressure sensor detects the real-time water pressure of the network, and the distal pressure sensor detects the water pressure of the front-end users. A liquid level sensor is arranged in the clear water tank, and the liquid level sensor also detects the liquid level in the clear water tank. A position sensor is provided in the regulating valve, which can detect the valve opening and feed back the valve opening signal to the PLC controller.

[0009] The present invention is further configured as follows: the control module comprises: A controller, controlling the opening of the regulating valve; A data processing unit processes the data collected by the acquisition module and transmits the data to the controller; An alarm unit, which gives an alarm according to the signal of the detection module; The HMI unit is connected to the interactive module via a network cable to interact with the interactive module.

[0010] In this technical solution, the control module includes a controller, a data processing unit, an alarm unit and an HMI unit. The controller is the core unit of the control module and adopts a PLC controller. The controller is provided with a control program with a PID function, which can control the opening of the regulating valve.

[0011] The data processing unit can process the data collected by the collection module and transmit it to the controller.

[0012] The alarm unit can give an alarm based on the signal from the detection module.

[0013] The HMI unit is connected to the interactive module via a network cable and can interact with the interactive module. In this embodiment, the interactive module includes a touch screen, which supports the user to set the system's operating parameters on the touch screen. The information fed back by the system based on the parameters set by the user can also be displayed on the touch screen.

[0014] The present invention is further configured as follows: the detection module comprises: The liquid level detection unit obtains the liquid level status signal of the clean water tank and transmits it to the control module to control the liquid level status indicator light of the interactive module to turn on and off; The sensing detection unit is connected to the control module to detect whether the acquisition module is faulty. If the acquisition module is faulty, a signal is transmitted to the control module, and the control module controls the interactive module to display a text prompt; The pressure detection unit is connected to a pressure transmitter to detect the pressure status of the pipeline network and transmit it to the control module.

[0015] In the present technical solution, the detection module includes a liquid level detection unit, in which a liquid level transmitter is provided, which can feed back actual liquid level data and determine whether the liquid level state is appropriate.

[0016] The detection module also includes a pressure detection module and a sensor detection module. The pressure detection module detects whether the pressure is appropriate. If the actual pressure is higher than the lower pressure limit set in the controller, the controller controls the regulating valve to close. The sensor detection module detects whether the sensor is working normally. If there is a fault, a text prompt will be displayed on the display screen.

[0017] The present invention is further configured as follows: the controller obtains a lower pressure limit value from the interaction module through the HMI unit, and the lower pressure limit value is transmitted to the detection module; the controller obtains an upper liquid level limit value and a lower liquid level limit value from the interaction module through the HMI unit, and the upper liquid level limit value and the lower liquid level limit value are transmitted to the detection module.

[0018] In this technical solution, the interactive module includes a touch screen, which is connected to the control module via a network cable. The touch screen can display the current working status and set operating parameters, where the parameters include the lower limit of pressure, the upper limit of liquid level and the lower limit of liquid level. The controller obtains the parameters from the interactive module through the HMI unit and then transmits the parameters to the detection module.

[0019] The present invention is further configured to include: a remote transmission module that transmits a remote pressure signal to the control module; the acquisition module also includes a remote pressure sensor that is installed at an unfavorable point in the municipal pipe network to collect remote pressure; the detection module also includes a remote transmission detection unit that is connected to the control module to detect whether the remote transmission module is faulty and transmit a signal to the control module to control the remote transmission indicator light of the interactive module to turn on and off.

[0020] In this technical solution, the remote transmission module is connected between the control module and the sensor module, and can transmit the remote pressure signal detected by the remote pressure sensor to the control module. The remote transmission detection unit can detect whether the remote transmission module is normal and transmit the detected information to the controller, and the controller transmits the signal to the display screen, which is indicated by the indicator light on the display screen.

[0021] The present invention is further configured such that: the liquid level sensor is connected to a liquid level transmitter, and the liquid level transmitter processes the liquid level information collected by the liquid level sensor and transmits the processed information to the detection module.

[0022] In this technical solution, the liquid level transmitter processes the liquid level information collected by the liquid level sensor and transmits it to the detection module.

[0023] The present invention is further configured such that: the remote pressure sensor is connected to a pressure transmitter, and the pressure transmitter processes the pressure information collected by the remote pressure sensor and transmits the pressure information to the detection module.

[0024] In this technical solution, the pressure transmitter processes the pressure information collected by the remote pressure sensor and transmits it to the detection module.

[0025] The present invention also adopts the following technical solution: a method for automatically replenishing water in a clean water tank, using the above-mentioned automatic water replenishing system for a clean water tank, comprising the following steps: S1, inputting parameters in the interactive module, wherein the parameters include a lower pressure limit, an upper liquid level limit, and a lower liquid level limit; S2, obtain the pipe network pressure and the clear water tank level; S3, check whether the acquisition module is faulty, and if so, alarm; otherwise, go to step S4; S4, judge whether the liquid level state is appropriate according to the first-level preset rules. If the liquid level state is not appropriate, output the regulating valve opening according to the first-level preset rules; if the liquid level state is appropriate, the liquid level indicator light of the interactive module is on, and output the regulating valve opening according to the second-level preset rules.

[0026] In this technical solution, the user first sets parameters on the touch screen of the interactive module, including the lower limit of pressure, the upper limit of liquid level and the lower limit of liquid level. Then the system obtains the pipe network pressure and the liquid level of the clear water tank through the acquisition module and transmits them to the control module.

[0027] Before outputting the valve opening, the system must first perform a status check, including the sensor detection unit of the detection module detecting whether several sensors of the acquisition module are faulty. If so, the fault information is transmitted to the alarm unit for warning, and a text prompt pops up through the touch screen of the interactive module; it also includes the remote transmission detection unit of the detection module detecting whether the remote transmission module is faulty. If so, the remote transmission indicator light on the touch screen of the interactive module goes out.

[0028] After the detection is completed, the control valve opening is output according to the preset rules.

[0029] The present invention is further configured as follows: the first-level preset rules include: when the liquid level in the clear water tank is higher than the lower limit value of the liquid level and lower than the upper limit value of the liquid level, the liquid level state is appropriate; otherwise, the liquid level state is inappropriate, when the liquid level in the clear water tank is not higher than the lower limit value of the liquid level, the output regulating valve opening is 100%, and when the liquid level in the clear water tank is not lower than the upper limit value of the liquid level, the output regulating valve opening is 0%; the second-level preset rules include: when the pipeline network pressure is lower than the lower limit value of the pressure, the output regulating valve opening is 0%; when the pipeline network pressure is not lower than the lower limit value of the pressure, the controller calculates the regulating valve opening value as the output according to the difference between the pipeline network pressure and the lower limit value of the pressure.

[0030] In the present technical solution, for step S4, the first-level preset rules include: when the liquid level in the clear water tank is higher than the lower limit value of the liquid level and lower than the upper limit value of the liquid level, the liquid level state is appropriate; otherwise, the liquid level state is inappropriate, when the liquid level in the clear water tank is not higher than the lower limit value of the liquid level, the opening of the output regulating valve is 100%, and when the liquid level in the clear water tank is not lower than the upper limit value of the liquid level, the opening of the output regulating valve is 0%.

[0031] The secondary preset rules include: when the pipeline pressure is lower than the lower pressure limit, the output regulating valve opening is 0%; when the pipeline pressure is not lower than the lower pressure limit, the controller calculates the regulating valve opening value as the output based on the difference between the pipeline pressure and the lower pressure limit, and the output regulating valve opening increases with the increase of the pipeline pressure.

[0032] The beneficial effects of the present invention are: (1) Using differential pressure change PID regulation to control the valve opening can achieve precise pressure control and liquid level control; (2) The remote pressure sensor collects the remote pressure and predicts the user's water pressure, making the pressure control more accurate; (3) When the user's water usage changes, the valve will automatically adjust to ensure the pressure of the pipe network, so that the clean water tank can be automatically replenished without manual adjustment, saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The invention discloses a structural schematic diagram of an automatic water replenishing system for a clean water tank.

[0034] Figure 2 The present invention is a system block diagram of an automatic water replenishment system for a clean water tank.

[0035] Figure 3 The invention discloses a working flow chart of an automatic water replenishing system for a clean water tank.

[0036] Figure numerals: clean water tank 1; water supply pipe 2; regulating valve 3; proximal pressure sensor 4; distal pressure sensor 5; liquid level sensor 6; position sensor 7; control module 8; remote transmission module 9. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example 1 This embodiment provides an automatic water replenishment system for a clean water tank. Figure 1 and Figure 2 It can automatically adjust the water inlet flow of the clear water tank according to the pressure of the pipe network, realize automatic water replenishment of the clear water tank, and solve the problem that the water replenishment of the clear water tank needs manual adjustment.

[0039] The automatic water replenishment system for the clean water tank comprises a clean water tank 1 and a water supply pipeline 2. Collection modules are arranged in the clean water tank and the water supply pipeline to detect the liquid level of the clean water tank and the pressure of the pipe network.

[0040] The acquisition module includes a proximal pressure sensor 4 , a liquid level sensor 6 and a position sensor 7 .

[0041] The proximal pressure sensor is installed at one end of the water supply pipe close to the clean water tank, which can detect the pipe network pressure in real time and transmit it to the control module.

[0042] The liquid level sensor is arranged in the clean water tank and can detect the liquid level change of the clean water tank in real time.

[0043] The liquid level sensor is connected to a liquid level transmitter, which processes the liquid level information collected by the liquid level sensor and transmits it to the detection module.

[0044] A regulating valve 3 is arranged at the front end of the clear water tank, and a position sensor is arranged inside the regulating valve, which can detect the opening of the regulating valve and feed back to the control module.

[0045] The automatic water replenishment system for the clean water tank also includes a control module 8, which is electrically connected to the regulating valve. The control module can control the opening of the regulating valve according to the liquid level of the clean water tank and the pressure of the pipe network.

[0046] The control module is connected to an interactive module, which can interact with the control module, set system operating parameters, and display information obtained by the acquisition module and the detection module.

[0047] The control module includes a controller, a data processing unit, an alarm unit and an HMI unit.

[0048] The controller is the core unit of the control module. In this embodiment, the controller is a PLC controller. The PLC controller is provided with a control program with a PID function, which can control the opening of the regulating valve.

[0049] The data processing unit can process the data collected by the collection module and transmit it to the controller.

[0050] The alarm unit can give an alarm based on the signal from the detection module.

[0051] The HMI unit is connected to the interactive module via a network cable and can interact with the interactive module. In this embodiment, the interactive module includes a touch screen, which supports the user to set the system's operating parameters on the touch screen. The information fed back by the system based on the parameters set by the user can also be displayed on the touch screen.

[0052] The automatic water replenishment system for the clear water tank also includes a detection module, which can detect whether the collection module is faulty and can also detect the liquid level status of the clear water tank and the pressure status of the pipe network.

[0053] The detection module includes a liquid level detection unit, a sensor detection unit and a pressure detection unit.

[0054] The liquid level detection unit can obtain the liquid level status signal of the clean water tank and transmit it to the control module to control the liquid level status indicator light of the interactive module to turn on and off.

[0055] The sensing detection unit is connected to the control module and can detect whether the acquisition module is faulty. If the acquisition module is faulty, a signal is transmitted to the control module, and the control module controls the interactive module to display a text prompt.

[0056] The pressure detection unit is connected to a pressure transmitter, which can detect the pressure status of the pipeline network and transmit it to the control module.

[0057] The system operating parameters include a lower pressure limit value. The controller obtains the lower pressure limit value from the interaction module through the HMI unit, and the lower pressure limit value is transmitted to the detection module.

[0058] The system operating parameters also include an upper limit value and a lower limit value of the liquid level. The controller obtains the upper limit value and the lower limit value of the liquid level from the interaction module through the HMI unit, and the upper limit value and the lower limit value of the liquid level are transmitted to the detection module.

[0059] The automatic water replenishment system of the clear water tank includes a controller and a regulating valve. The controller can control the opening of the regulating valve, and the size of the water replenishment flow is controlled by the opening of the regulating valve. The automatic adjustment of the water replenishment flow is achieved through the cooperation of the controller and the regulating valve.

[0060] In this embodiment, the water supply pipeline includes a primary water supply pipeline and two secondary water supply pipelines. The primary water supply pipeline adopts a DN400 pipe, and the secondary water supply pipeline adopts a DN300 pipe.

[0061] The secondary water supply pipeline is respectively provided with an electric valve, and the regulating valve is arranged on the primary water supply pipeline, and its opening is controlled by a controller. When the automatic water replenishment system of the clear water tank is started, the two electric valves arranged on the secondary water supply pipeline remain fully open.

[0062] A proximal pressure sensor is installed at the proximal end of the pipe network, that is, at the end of the water supply pipe close to the clear water tank to detect the pipe network pressure in real time. The pipe network pressure can reflect the water pressure supplied by the water plant to users. The pipe network pressure signal collected by the proximal pressure sensor is synchronized to the pressure detection unit of the detection module in real time.

[0063] In order to give priority to ensuring the water pressure of front-end users, it is necessary to ensure the minimum pressure of the pipeline network. A parameter called the lower limit of pressure is stored in the control module, which can be set by the user of the clear water tank self-water replenishment system.

[0064] The user inputs the minimum pressure to be set as the lower pressure limit on the touch screen of the interactive module. The HMI unit of the control module receives and processes this signal and transmits the lower pressure limit to the controller. The controller synchronizes the lower pressure limit to the pressure detection unit of the detection module.

[0065] The pressure detection unit compares the acquired pipe network pressure with the lower pressure limit in real time, and sends the comparison result to the data processing unit of the control module for processing, and then passes it to the controller to output the regulating valve opening.

[0066] The system can be set to work in automatic mode or manual mode, and the manual mode and automatic mode can be switched on the touch screen.

[0067] The touch screen is provided with a "manually set valve opening" input item, where the user can manually enter the valve opening percentage value.

[0068] The touch screen is also provided with "manual valve start opening" and "valve closing" buttons. When the system works in manual mode, the user manually enters the valve opening percentage value at "manual setting of valve opening", presses the "manual valve start opening" button to open the regulating valve to the set opening, and presses the "valve closing" button to completely close the valve.

[0069] Setting the manual mode can make the system control more flexible and easier to deal with emergencies.

[0070] When the system works in automatic mode, the system automatically adjusts the opening of the regulating valve according to the pipe network pressure and the liquid level of the clean water tank.

[0071] Among them, the clear water tank level has a higher priority than the pipe network pressure.

[0072] When the liquid level in the clear water tank is not higher than the lower limit of the liquid level, the opening of the output regulating valve is 100%; when the liquid level in the clear water tank is not lower than the upper limit of the liquid level, the opening of the output regulating valve is 0%.

[0073] When the liquid level in the clear water tank is higher than the lower limit value and lower than the upper limit value, the liquid level state is appropriate, and the valve opening is adjusted according to the network pressure output.

[0074] When the network pressure is lower than the set lower pressure limit, the opening of the controller output regulating valve is 0%, that is, the valve is completely closed and the system automatically stops replenishing water.

[0075] When the network pressure is not lower than the set lower pressure limit, the controller calculates the opening value of the regulating valve as output according to the difference between the network pressure and the lower pressure limit.

[0076] At this time, the regulating valve slowly opens to a certain degree from the closed state, and the pipeline pressure slowly decreases.

[0077] The valve continues to open at an increasing angle. When the network pressure approaches the set lower pressure limit, the valve maintains a certain opening.

[0078] When the user's water consumption increases, the remote pressure decreases and the valve opening decreases accordingly.

[0079] When the liquid level is higher than the upper limit value, it means that the water in the pool is full and the valve is forced to close.

[0080] The system includes two valve limit modes. The user can set the valve opening limit according to the time period on the touch screen and select the valve limit mode.

[0081] There are two types of valve restriction modes:

[0082] Limitation mode 1: When the output control valve opening is greater than the automatic mode valve opening limit, the actual valve opening is based on the automatic mode valve opening limit.

[0083] Limitation mode 2: The valve opening obtained by linearly converting the actual valve opening "0%-100%" and "0%-valve opening limit" in equal proportion is used as the actual valve opening.

[0084] Example 2 This embodiment provides an automatic water replenishment system for a clean water tank. Figure 1 and Figure 2 , can automatically adjust the water flow rate of the clean water tank according to the remote pressure, realize automatic water replenishment of the clean water tank, and solve the problem that the water replenishment of the clean water tank needs manual adjustment. Different from the embodiment 1, the automatic water replenishment system of the clean water tank of this embodiment is also provided with a remote pressure sensor 5 and a remote transmission module 9.

[0085] The automatic water replenishment system of the clear water tank includes a clear water tank and a water supply pipeline. Collection modules are arranged in the clear water tank and the water supply pipeline to detect the liquid level of the clear water tank and the pressure of the pipe network.

[0086] The acquisition module includes a proximal pressure sensor, a liquid level sensor and a position sensor.

[0087] The proximal pressure sensor is installed at one end of the water supply pipe close to the clean water tank, which can detect the pipe network pressure in real time and transmit it to the control module.

[0088] The liquid level sensor is arranged in the clean water tank and can detect the liquid level change of the clean water tank in real time.

[0089] The liquid level sensor is connected to a liquid level transmitter, which processes the liquid level information collected by the liquid level sensor and transmits it to the detection module.

[0090] A regulating valve is arranged at the front end of the clear water tank, and a position sensor is arranged inside the regulating valve, which can detect the opening of the regulating valve and feed back to the control module.

[0091] In this embodiment, the acquisition module also includes a remote pressure sensor installed at an unfavorable point in the municipal pipe network to collect remote pressure signals.

[0092] Due to the long distance of the water supply network, the pressure near the water plant and the pressure far away are not synchronized. In order to achieve more precise control and to be able to predict the water usage of front-end users in advance, a remote pressure sensor is installed at an unfavorable point in the municipal water supply network, and then the remote pressure signal obtained at the remote end is transmitted to the controller through the remote transmission module.

[0093] An automatic water replenishment system for a clean water tank in this embodiment also includes a remote transmission module, which is responsible for transmitting the remote pressure signal to the control module. The remote transmission module includes a data acquisition unit, a wireless communication unit and a data sending unit, wherein the data acquisition unit can receive and store the remote pressure signal collected by the remote pressure sensor, the wireless communication unit modulates and demodulates the remote pressure signal collected by the data acquisition unit, and the data sending unit can convert the remote pressure signal into a high-frequency signal for transmission.

[0094] The remote pressure sensor is installed at an unfavorable point in the municipal water supply network and can detect the water pressure of the front-end users. When the user's water consumption is large during the peak water consumption period, the pressure detected by the remote pressure sensor is high. When the user's water consumption is small during the off-peak water consumption period, the pressure detected by the remote pressure sensor is low.

[0095] The remote pressure sensor is connected to a pressure transmitter, which processes the remote pressure received from the remote transmission module and transmits it to the detection module.

[0096] In this embodiment, the control module uses the remote pressure as the pipe network pressure.

[0097] The automatic water replenishment system for the clean water tank also includes a control module, which is electrically connected to the regulating valve. The control module can control the opening of the regulating valve according to the liquid level of the clean water tank and the remote pressure.

[0098] The control module is connected to an interactive module, which can interact with the control module, set system operating parameters, display information obtained by the acquisition module and the detection module, and display the current working status.

[0099] The control module includes a controller, a data processing unit, an alarm unit and an HMI unit.

[0100] The controller is the core unit of the control module. In this embodiment, the controller is a PLC controller. The PLC controller is provided with a control program with a PID function, which can control the opening of the regulating valve.

[0101] The data processing unit can process the data collected by the collection module and transmit it to the controller.

[0102] The alarm unit can give an alarm based on the signal from the detection module.

[0103] The HMI unit is connected to the interactive module via a network cable and can interact with the interactive module. In this embodiment, the interactive module includes a touch screen, which supports the user to set the system's operating parameters on the touch screen. The information fed back by the system based on the parameters set by the user can also be displayed on the touch screen.

[0104] In this embodiment, the information displayed on the touch screen includes three types: feedback value, setting value and control button, which are distinguished by different colors. The feedback value is displayed in purple, the setting value is displayed in light blue, and the control button is displayed in green.

[0105] The feedback value includes the following parameters.

[0106] Actual pressure, indicating the actual pressure data fed back by the remote module.

[0107] Actual liquid level means that the feedback from the level transmitter is the actual liquid level data.

[0108] Actual valve opening, indicating the actual valve opening value.

[0109] Automatic valve opening limit: indicates the opening of the regulating valve calculated by the system PLC controller based on PID.

[0110] Automatically set the pressure according to the pressure feedback setting value during the period set by the user.

[0111] Automatically set the minimum pressure according to the pressure feedback setting value during the period set by the user.

[0112] The automatic limit valve opening is based on the set value of the pressure feedback during the period set by the user.

[0113] The setting value includes the following parameters.

[0114] Automatic liquid level lower limit value: when the actual liquid level value is not higher than the automatic liquid level lower limit value, the liquid level indicator light turns green.

[0115] Automatic liquid level upper limit value: when the actual liquid level value is not lower than the automatic liquid level upper limit value, the liquid level indicator light goes out.

[0116] Manually set the valve opening. The valve opening can be manually set in manual mode.

[0117] Automatically reaches the high liquid level and delays closing the valve. When the actual liquid level is higher than the automatically set start high liquid level, the delay setting actually closes the valve.

[0118] There are several types of buttons:

[0119] Manual / automatic mode switch, click the button to switch between manual mode and automatic mode.

[0120] Valve restriction mode switch, click the button to switch the valve restriction mode.

[0121] Valve manual start opening: In manual mode, according to the manual setting of the valve opening, click the valve manual start opening to manually open the valve.

[0122] The valve is manually closed. In manual mode, click the valve manually closed and the valve will be closed directly.

[0123] The automatic water replenishment system for the clear water tank also includes a detection module, which can detect whether the collection module is faulty and can also detect the liquid level status of the clear water tank and the pressure status of the pipe network.

[0124] The detection module includes a liquid level detection unit, a sensor detection unit and a pressure detection unit.

[0125] The liquid level detection unit can obtain the liquid level status signal of the clean water tank and transmit it to the control module to control the liquid level status indicator light of the interactive module to turn on and off.

[0126] The sensing detection unit is connected to the control module and can detect whether the acquisition module is faulty. If the acquisition module is faulty, a signal is transmitted to the control module, and the control module controls the interactive module to display a text prompt.

[0127] The pressure detection unit is connected to a pressure transmitter, which can detect the pressure status of the pipeline network and transmit it to the control module.

[0128] In this embodiment, the detection module also includes a remote detection unit, which is connected to the control module and can detect whether the remote module is faulty and transmit a signal to the control module to control the remote indicator light of the interactive module to turn on and off.

[0129] The system operating parameters include a lower pressure limit value. The controller obtains the lower pressure limit value from the interaction module through the HMI unit, and the lower pressure limit value is transmitted to the detection module.

[0130] The system operating parameters also include an upper limit value and a lower limit value of the liquid level. The controller obtains the upper limit value and the lower limit value of the liquid level from the interaction module through the HMI unit, and the upper limit value and the lower limit value of the liquid level are transmitted to the detection module.

[0131] The automatic water replenishment system of the clear water tank includes a controller and a regulating valve. The controller can control the opening of the regulating valve, and the size of the water replenishment flow is controlled by the opening of the regulating valve. The automatic adjustment of the water replenishment flow is achieved through the cooperation of the controller and the regulating valve.

[0132] In this embodiment, the water supply pipeline includes a primary water supply pipeline and two secondary water supply pipelines. The primary water supply pipeline adopts a DN400 pipe, and the secondary water supply pipeline adopts a DN300 pipe.

[0133] The secondary water supply pipeline is respectively provided with an electric valve, and the regulating valve is arranged on the primary water supply pipeline, and its opening is controlled by a controller. When the automatic water replenishment system of the clear water tank is started, the two electric valves arranged on the secondary water supply pipeline remain fully open.

[0134] A remote pressure sensor is installed at the far end of the pipe network, that is, at the end of the water supply pipe close to the municipal pipe network to detect in real time the water pressure supplied by the water plant to users. The remote pressure signal collected by the remote pressure sensor, i.e., the remote pressure, is synchronized in real time to the pressure detection unit of the detection module through the remote transmission module.

[0135] In order to give priority to ensuring the water pressure of front-end users, it is necessary to ensure the minimum pressure of the pipeline network. A parameter called the lower limit of pressure is stored in the control module, which can be set by the user of the clear water tank self-water replenishment system.

[0136] The user inputs the minimum pressure to be set as the lower pressure limit on the touch screen of the interactive module. The HMI unit of the control module receives and processes this signal and transmits the lower pressure limit to the controller. The controller synchronizes the lower pressure limit to the pressure detection unit of the detection module.

[0137] The pressure detection unit compares the acquired remote pressure with the lower limit of pressure in real time, and sends the comparison result to the data processing unit of the control module for processing, and then transmits it to the controller to output the regulating valve opening.

[0138] The system can be set to work in automatic mode or manual mode, and the manual mode and automatic mode can be switched on the touch screen.

[0139] The touch screen is provided with a "manually set valve opening" input item, where the user can manually enter the valve opening percentage value.

[0140] The touch screen is also provided with "manual valve start opening" and "valve closing" buttons. When the system works in manual mode, the user manually enters the valve opening percentage value at "manual setting of valve opening", presses the "manual valve start opening" button to open the regulating valve to the set opening, and presses the "valve closing" button to completely close the valve.

[0141] Setting the manual mode can make the system control more flexible and easier to deal with emergencies.

[0142] When the system works in automatic mode, the system automatically adjusts the opening of the regulating valve according to the remote pressure and the liquid level of the clean water tank.

[0143] Among them, the clear water tank level has a higher priority than the remote pressure.

[0144] When the liquid level in the clear water tank is not higher than the lower limit of the liquid level, the opening of the output regulating valve is 100%; when the liquid level in the clear water tank is not lower than the upper limit of the liquid level, the opening of the output regulating valve is 0%.

[0145] When the liquid level in the clear water tank is higher than the lower limit value and lower than the upper limit value, the liquid level state is appropriate, and the valve opening is adjusted according to the remote pressure output.

[0146] When the remote pressure is lower than the set lower pressure limit, the opening of the controller output regulating valve is 0%, that is, the valve is completely closed, and the system automatically stops replenishing water.

[0147] When the remote pressure is not lower than the set lower pressure limit, the system can automatically adjust. The controller calculates the opening value of the regulating valve as the output based on the difference between the remote pressure and the lower pressure limit, and maximizes the water replenishment flow while ensuring the pressure at the front end of the pipeline network, so as to fill the clean water tank in the shortest time.

[0148] At this time, the regulating valve slowly opens to a certain degree from the closed state, and the remote pressure slowly decreases.

[0149] The valve continues to open at an increasing angle. When the remote pressure approaches the set lower pressure limit, the valve maintains a certain opening.

[0150] When the user's water consumption increases, the remote pressure decreases and the valve opening decreases accordingly.

[0151] When the liquid level is higher than the upper limit value, it means that the water in the pool is full and the valve is forced to close.

[0152] The system includes two valve limit modes. The user can set the valve opening limit according to the time period on the touch screen and select the valve limit mode.

[0153] There are two types of valve restriction modes:

[0154] Limitation mode 1: When the output control valve opening is greater than the automatic mode valve opening limit, the actual valve opening is based on the automatic mode valve opening limit.

[0155] Limitation mode 2: The valve opening obtained by linearly converting the actual valve opening "0%-100%" and "0%-valve opening limit" in equal proportion is used as the actual valve opening.

[0156] The following describes in detail the working process of the automatic water replenishment system for the clean water tank of this embodiment in the automatic mode, referring to Figure 3 .

[0157] First, determine whether the liquid level in the clean water tank is lower than the upper limit of the liquid level. If the liquid level in the clean water tank is not lower than the upper limit of the liquid level, the liquid level status indicator light on the display screen goes out, and the controller controls the regulating valve opening to be fully closed.

[0158] If the liquid level in the clean water tank is lower than the upper limit value, then continue to determine whether the liquid level in the clean water tank is higher than the lower limit value. If the liquid level in the clean water tank is not higher than the upper limit value, the liquid level status indicator light on the display goes out, and the controller controls the regulating valve opening to be fully open.

[0159] If the liquid level in the clean water tank is higher than the lower limit of the liquid level, the pressure status is detected to determine whether the remote pressure is higher than the lower limit of the pressure. If the remote pressure is not higher than the lower limit of the pressure, the pressure status indicator on the display goes out and the controller controls the regulating valve opening to be fully closed.

[0160] If the remote pressure is higher than the lower pressure limit, the pressure status indicator on the display screen lights up, and the controller controls the regulating valve to gradually increase the opening until the remote pressure reaches the lower pressure limit and stops.

[0161] According to the actual situation on site, the working status of the automatic water replenishment system at each time period every day is as follows.

[0162] From 6:00 a.m. to 1:00 p.m., due to the peak water usage, the valve opening angle is 30% to 40%, and a small amount of water is replenished to the clear water tank.

[0163] From 13:00 to 17:00, due to the corresponding reduction in water consumption by users, the valve will open 40% to 50% to replenish the clear water tank.

[0164] From 17:00 to 23:00, users' water consumption increases, the valve is completely closed or the valve opening angle is 30% to 40%, and a small amount of water is replenished to the clear water tank.

[0165] From 23:00 to 6:00, users use very little water, the valve opening angle is greater than 60%, and a large amount of water is replenished to the clear water tank.

[0166] According to the working status of the automatic water replenishment system at different time periods every day, it can be seen that when the user's water usage changes, the clear water tank will be replenished with water, and the valve will be automatically adjusted without affecting the pipe network pressure. Under the premise of ensuring the pipe network pressure, the clear water tank will be automatically replenished with water without manual adjustment, saving labor costs.

[0167] Example 3 This embodiment provides a method for automatically replenishing a clean water tank, using the above-mentioned automatic water replenishing system for a clean water tank, and mainly includes the following steps: Step S1, input parameters in the interactive module, the parameters including the lower limit value of pressure, the upper limit value of liquid level and the lower limit value of liquid level.

[0168] In this embodiment, the user first sets parameters on the touch screen of the interactive module, the parameters including the lower limit of pressure, the upper limit of liquid level and the lower limit of liquid level, sets the system to work in automatic mode, and sets the valve opening limit according to the time period.

[0169] Step S2, obtaining the pipe network pressure and the clear water tank liquid level.

[0170] In this embodiment, the system obtains the pipe network pressure and the clear water tank liquid level through the acquisition module and transmits them to the control module.

[0171] Step S3, detect whether the acquisition module is faulty, and if so, alarm; otherwise, proceed to step S4.

[0172] In this embodiment, the system must first perform a status detection before outputting the valve opening, including the sensor detection unit of the detection module detecting whether several sensors of the acquisition module are faulty. If so, the fault information is transmitted to the alarm unit for warning, and a text prompt pops up through the touch screen of the interactive module; it also includes the remote transmission detection unit of the detection module detecting whether the remote transmission module is faulty. If so, the remote transmission indicator light on the touch screen of the interactive module goes out.

[0173] Step S4, determine whether the liquid level state is appropriate according to the first-level preset rules. If the liquid level state is not appropriate, output the regulating valve opening according to the first-level preset rules; if the liquid level state is appropriate, the liquid level indicator light of the interactive module is on, and the regulating valve opening is output according to the second-level preset rules.

[0174] For step S4, the first-level preset rules include: when the liquid level in the clear water tank is higher than the lower limit value and lower than the upper limit value, the liquid level state is appropriate; otherwise, the liquid level state is inappropriate, when the liquid level in the clear water tank is not higher than the lower limit value, the output regulating valve opening is 100%, and when the liquid level in the clear water tank is not lower than the upper limit value, the output regulating valve opening is 0%.

[0175] The secondary preset rules include: when the pipeline pressure is lower than the lower pressure limit, the output regulating valve opening is 0%; when the pipeline pressure is not lower than the lower pressure limit, the output regulating valve opening increases with the increase of the pipeline pressure.

Claims

1. A clean water tank automatic water replenishment system, comprising a clean water tank and a water supply pipeline, characterized in that: include: A collection module is arranged in the clean water tank and the water supply pipeline to detect the liquid level of the clean water tank and the pressure of the pipe network; A control module is electrically connected to the regulating valve at the front end of the clean water tank, and controls the opening of the regulating valve according to the liquid level of the clean water tank and the pressure of the pipe network; Detection module, detects whether the acquisition module is faulty, detects the liquid level status of the clean water tank and the pressure status of the pipe network; The interactive module interacts with the control module, sets system operating parameters, and displays the information obtained by the acquisition module and the detection module.

2. The automatic water replenishment system for a clean water tank according to claim 1, characterized in that: The acquisition module comprises: The proximal pressure sensor is installed at one end of the water supply pipeline close to the clean water tank to detect the pipe network pressure; A liquid level sensor is arranged in the clean water tank to detect the change of the liquid level in the clean water tank; The position sensor is arranged in the regulating valve to detect the opening of the regulating valve and feed back to the control module.

3. The automatic water replenishment system for a clean water tank according to claim 1, characterized in that: The control module comprises: A controller, controlling the opening of the regulating valve; A data processing unit processes the data collected by the acquisition module and transmits the data to the controller; An alarm unit, which gives an alarm according to the signal of the detection module; The HMI unit is connected to the interactive module via a network cable to interact with the interactive module.

4. The automatic water replenishment system for a clean water tank according to claim 1, characterized in that: The detection module comprises: The liquid level detection unit obtains the liquid level status signal of the clean water tank and transmits it to the control module to control the liquid level status indicator light of the interactive module to turn on and off; The sensing detection unit is connected to the control module to detect whether the acquisition module is faulty. If the acquisition module is faulty, a signal is transmitted to the control module, and the control module controls the interactive module to display a text prompt; The pressure detection unit is connected to a pressure transmitter to detect the pressure status of the pipeline network and transmit it to the control module.

5. The automatic water replenishment system for a clean water tank according to claim 3, characterized in that: The controller obtains the lower pressure limit value from the interaction module through the HMI unit, and the lower pressure limit value is transmitted to the detection module; the controller obtains the upper and lower liquid level limits from the interaction module through the HMI unit, and the upper and lower liquid level limits are transmitted to the detection module.

6. An automatic water replenishment system for a clean water tank according to any one of claims 1 to 5, characterized in that: It also includes a remote transmission module, which transmits a remote pressure signal to the control module; the acquisition module also includes a remote pressure sensor, which is installed at an unfavorable point in the municipal pipe network to collect remote pressure; the detection module also includes a remote transmission detection unit, which is connected to the control module, detects whether the remote transmission module is faulty and transmits a signal to the control module, and controls the remote transmission indicator light of the interactive module to turn on and off.

7. The automatic water replenishment system for a clean water tank according to claim 2, characterized in that: The liquid level sensor is connected to a liquid level transmitter, and the liquid level transmitter processes the liquid level information collected by the liquid level sensor and transmits it to the detection module.

8. The automatic water replenishment system for a clean water tank according to claim 6, characterized in that: The remote pressure sensor is connected to a pressure transmitter, and the pressure transmitter processes the pressure information collected by the remote pressure sensor and transmits the pressure information to the detection module.

9. A method for automatically replenishing a clean water tank, using the automatic water replenishing system for a clean water tank according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, inputting parameters in the interactive module, wherein the parameters include a lower limit value of pressure, an upper limit value of liquid level and a lower limit value of liquid level; S2, obtain the pipe network pressure and the clear water tank level; S3, check whether the acquisition module is faulty, and if so, alarm; otherwise, go to step S4; S4, judging whether the liquid level state is appropriate according to the first-level preset rule, and if the liquid level state is not appropriate, outputting the opening of the regulating valve according to the first-level preset rule; If the liquid level status is appropriate, the interactive module liquid level indicator light will light up, and the regulating valve opening will be output according to the secondary preset rules.

10. The automatic water replenishment method for a clean water tank according to claim 9, characterized in that: The first-level preset rules include: when the liquid level in the clear water tank is higher than the lower limit value of the liquid level and lower than the upper limit value of the liquid level, the liquid level state is appropriate; otherwise, the liquid level state is inappropriate. When the liquid level in the clear water tank is not higher than the lower limit value of the liquid level, the output regulating valve opening is 100%; when the liquid level in the clear water tank is not lower than the upper limit value of the liquid level, the output regulating valve opening is 0%; the second-level preset rules include: when the pipeline pressure is lower than the lower limit value of the pressure, the output regulating valve opening is 0%; when the pipeline pressure is not lower than the lower limit value of the pressure, the controller calculates the regulating valve opening value as the output according to the difference between the pipeline pressure and the lower limit value of the pressure.

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