Microfilter control system and control method

Abstract

The invention discloses a microstrainer control system and a control method, relates to the technical field of microstrainer adjustment, and solves the technical problems of monitoring the change condition of the liquid level height of inlet and outlet water, adjusting the rotating speed of a motor and the flushing pressure, keeping effective flux of a filter screen and controlling the energy consumption of equipment at the same time. The rotating speed of the filter cartridge motor and the pressure of the backwashing pump are adjusted in real time according to the change condition of the height difference of the liquid levels of inlet and outlet water, so that the effective flux of the filter screen is kept, the quality of outlet water is ensured, and meanwhile, the energy consumption of equipment is controlled; the microstrainer control system can automatically control the operation of the microstrainer, full automation is realized, manual operation is not needed, manpower and material resources are saved, and the sewage treatment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of microfilter regulation, and specifically to a microfilter control system and a control method therefor. Background Art

[0002] A microfilter, also known as a precision filter, is used in the water treatment field with relatively high environmental requirements and high filtration precision. It filters suspended solids, microparticles and other impurities in the liquid through filter elements in the form of filter cloth, filter screen, filter disc, etc. on a rotating filter cylinder to achieve the purpose of purifying water quality. Filtration efficiency and energy consumption are important performance indicators of the microfilter. How to reduce energy consumption on the premise of ensuring high-efficiency filtration, an automatic control method is particularly important.

[0003] According to the patent application with the application number CN218221393U, a microfilter control system and a microfilter are disclosed. The microfilter control system includes a water inlet pump, a water level sensing device, a first relay and a control device. The water inlet pump is connected to the water inlet shaft core of the microfilter through a water inlet pipeline. The water level sensing device is arranged on the microfilter and is electrically connected to the control device. The water inlet pump is electrically connected to the first relay, and the first relay is electrically connected to the control device. The control device can control the opening and closing of the water inlet pump through the first relay; the microfilter includes the microfilter control system.

[0004] However, when some existing microfilter control systems are in use, the microfilter controls the filter cylinder at a constant speed. If the speed is too high, the energy consumption is high; if the speed is too low, the residence time of the filter screen is long, it is easy to be blocked, and the filtration effect decreases. Or after the filter screen is severely blocked and the system head loss is too large, the driving motor speed is adjusted, and at the same time, the filter screen is cleaned while the machine is stopped, which affects the normal continuous operation of the equipment. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a microfilter control system and a control method therefor, which solve the problems of monitoring the change of the liquid level height of the inlet and outlet water, adjusting the motor speed and the flushing pressure, so that the filter screen maintains an effective flux, and at the same time controlling the energy consumption of the equipment.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A microfilter control system includes:

[0007] A filter cylinder control unit, configured to obtain the inlet and outlet water level values and the flushing pressure, judge the two values, generate a normal monitoring signal and a speed adjustment signal, and at the same time transmit the speed adjustment signal to the spray control unit;

[0008] A spray control unit, configured to analyze the obtained speed adjustment signal, generate a frequency adjustment signal and a secondary analysis signal based on the current frequency, and at the same time transmit the secondary analysis signal to the sludge pump control unit;

[0009] The sludge pump control unit is used to analyze the generated frequency adjustment signal to generate control adjustment information. At the same time, it comprehensively analyzes the adjusted liquid level difference to generate an abnormal alarm signal and a pressure adjustment signal for the secondary analysis signal, and analyzes and generates pressure adjustment information according to the spray pressure, and transmits it to the alarm control unit.

[0010] As a further solution of the present invention, the filter cartridge control unit includes a liquid level controller, and the liquid level controller further includes an inlet and an outlet liquid level sensor, which are respectively arranged at the inlet and outlet of the microfilter to obtain the inlet and outlet liquid levels.

[0011] As a further solution of the present invention, the spray control unit is connected to the backwash pump to control the start / stop and pressure of the backwash pump. The spray control unit further includes a pressure sensor arranged on the outer spray pipeline to feedback the outer spray washing pressure.

[0012] As a further solution of the present invention, the specific way for the filter cartridge control unit to generate a normal monitoring signal and a speed adjustment signal is as follows:

[0013] Record the inlet liquid level as H1, record the outlet liquid level as H2, and calculate the liquid level difference H according to the formula liquid level difference H = outlet liquid level value H2 - inlet liquid level value H1. At the same time, compare the liquid level difference H with the normal difference Hy. If the liquid level difference H is greater than the normal difference Hy, it means that the filter screen is blocked, and a speed adjustment signal is generated, and the speed adjustment signal is processed at the same time. On the contrary, if the liquid level difference H is less than the normal difference Hy, it means that the filter screen is normal, and a normal monitoring signal is generated, and the specific value of the normal difference Hy is set by the operator.

[0014] As a further solution of the present invention, the specific way for the spray control unit to analyze the speed adjustment signal is as follows:

[0015] Obtain the current frequency of the filter cartridge motor, and at the same time judge the current frequency. If the current frequency is the upper limit of the optimal working frequency, adjust the spray pressure and generate a frequency adjustment signal. On the contrary, if the current frequency does not reach the upper limit of the optimal working frequency, adjust the current frequency and generate frequency adjustment information, and at the same time transmit the frequency adjustment information to the alarm control unit, and analyze the frequency adjustment signal to generate a secondary analysis signal.

[0016] As a further solution of the present invention, the specific way for the sludge pump control unit to analyze the frequency adjustment signal to generate a secondary analysis signal is as follows:

[0017] Obtain the current frequency, and obtain all the frequencies corresponding to the filter cartridge machine. Then, obtain the high-frequency gear corresponding to the current frequency, and adjust it based on the high-frequency gear to generate control adjustment information. At the same time, analyze the generated pressure adjustment signal, adjust the current spray pressure to the maximum value, and obtain the corresponding liquid level difference Ho after adjustment. Then, compare the liquid level difference Ho with the preset difference Hp. If the liquid level difference Ho is greater than the preset difference Hp, it indicates that the filter screen is severely blocked, and an abnormal alarm signal is generated and transmitted to the alarm control unit. On the contrary, if the liquid level difference Ho is less than the preset difference Hp, then compare the liquid level difference Ho with the preset difference H3. If the liquid level difference Ho is less than the preset difference H3, it indicates that the filter screen has a large throughput, and a pressure adjustment signal is generated.

[0018] As a further solution of the present invention, the specific method for the sludge pump control unit to analyze the pressure adjustment signal is as follows:

[0019] Obtain the current spray pressure, and compare the spray pressure with the lower limit of the spray working pressure. If the current spray pressure is lower than the lower limit of the spray working pressure, a deceleration analysis signal is generated, and pressure adjustment information is generated based on the current spray pressure.

[0020] As a further solution of the present invention, it further includes an alarm control unit for displaying the obtained normal monitoring signal, abnormal alarm signal, control adjustment information, and pressure adjustment information to the corresponding operator.

[0021] A microfilter control method, which specifically includes the following steps:

[0022] Step S1: Obtain the inlet and outlet water level values and the flushing pressure through the liquid level controller, and judge the two values.

[0023] Step S2: Generate a speed adjustment signal and a normal monitoring signal based on the judgment of the inlet and outlet water level values. At the same time, analyze the speed adjustment signal to generate a frequency adjustment signal and a pressure adjustment signal.

[0024] Step S3: Analyze the generated frequency adjustment signal to generate control adjustment information, analyze the pressure adjustment signal, and at the same time analyze the adjusted liquid level difference to generate pressure adjustment information.

[0025] Step S4: Display the generated control adjustment information and pressure adjustment information to the corresponding operator.

[0026] The present invention provides a microfilter control system and a control method. Compared with the prior art, it has the following beneficial effects:

[0027] The present invention adjusts the rotational speed of the filter cartridge motor and the pressure of the backwash pump in real time according to the change of the height difference between the inlet and outlet liquid levels, so that the filter screen maintains an effective flux, ensures the water quality of the outlet, and controls the energy consumption of the equipment. By setting an upper limit on the cumulative working hours of the filter cartridge motor, detecting the working state of the motor, and performing maintenance on the motor in a timely manner, the equipment is kept in good working condition, the operating reliability of the equipment is improved. The microfiltration machine control system can automatically control the operation of the microfiltration machine, realizing full automation, without manual operation, saving manpower and material resources, and reducing the cost of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic block diagram of the system of the present invention;

[0029] Figure 2 It is a schematic diagram of the connection of the control system components of the present invention;

[0030] Figure 3 It is a process judgment diagram of the present invention;

[0031] Figure 4 It is a flow chart of the present invention.

[0032] In the figure, 1 - chassis, 2 - filter cartridge, 3 - external spray pipe, 4 - backwash pump, 5 - filter cartridge motor, 6 - liquid level controller, 7 - sludge pump, 8 - internal spray pipe, 91 - filter cartridge control unit, 92 - spray control unit, 91 - sludge pump control unit, 91 - alarm control unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1, please refer to Figures 1 to 4 , the present application provides a microfiltration machine control system, including a filter cartridge control unit, a spray control unit, a sludge pump control unit, and an alarm control unit, and it can be known from Figure 1 that the above functional units are connected in a one-way electrical connection.

[0035] The filter cartridge control unit is connected to the filter cartridge motor, and the filter cartridge control unit is used to control the start and stop of the filter cartridge motor and adjust the rotational speed;

[0036] The filter cartridge control unit includes a liquid level controller, which controls the operation of the filter cartridge motor in the liquid level control mode;

[0037] The liquid level controller further includes an inlet liquid level sensor and an outlet liquid level sensor, which are respectively arranged at the inlet and outlet of the microfilter; when the liquid level controller monitors that the inlet and outlet liquid levels rise beyond the overflow water level, it outputs a signal to the alarm control unit, and the alarm control unit starts the alarm to send an alarm signal to remind the operator to adjust the water intake. The filter cartridge control unit monitors that the cumulative working duration of the filter cartridge motor exceeds the set value, outputs a signal to the alarm control unit, and the alarm control unit starts the alarm to send an alarm signal.

[0038] The spray control unit is connected to the backwash pump to control the start / stop and pressure of the backwash pump; after the backwash pump automatically starts and runs for the set time, if the water pressure is too low and does not reach the normal value, it outputs a signal to the alarm control unit, and the alarm control unit starts the alarm to send an alarm signal; similarly, if the water pressure is too high, an alarm signal will also be sent.

[0039] The spray control unit further includes a pressure sensor arranged on the outer spray pipeline to feedback the outer spray washing pressure;

[0040] The sludge pump control unit is connected to the sludge pump and is used to control the sludge pump that filters the microfilter to pump out the microfilter;

[0041] The alarm control unit is respectively connected to the filter cartridge control unit and the backwash control unit, and is used to detect abnormal operation, send an alarm signal, and display and record the detailed alarm content;

[0042] The microfilter control system further includes: a manual mode and an automatic mode. The manual mode is for manual control of the equipment operation and is not affected by the liquid level control; the automatic mode controls the system operation according to the liquid level height.

[0043] The microfilter control system further includes: a touch display screen, which is connected to the filter cartridge control unit, the backwash control unit, the sludge pump control unit, and the alarm control unit;

[0044] The touch display screen includes: a working mode selection key for selecting the working mode of the microfilter control system;

[0045] The touch display screen further includes: a display of the working duration of the filter cartridge motor for displaying the cumulative working duration of the filter cartridge motor.

[0046] Specifically, the control method for starting and stopping the microfilter is as follows:

[0047] The startup sequence of the microfilter is as follows: the control unit of the filter cartridge starts the control system, and water is introduced from the outside into the filter cartridge. Then, the spray control unit controls the opening of the external spray pump. At the same time, after n1 seconds, the spray control unit controls the opening of the internal spray pump. And after n2 seconds, the control unit of the filter cartridge controls the start of the filter cartridge motor. Based on the above startup process, through sequential delayed startup, the spray is first turned on to wash away the impurities remaining on the filter screen and avoid current overload caused by starting up simultaneously. The sludge filtered by the filter cartridge is flushed into the sludge collection pipeline by the backwash water and flows by gravity to the sludge tank. After the sludge and other impurities accumulate to a certain extent, the sludge pump control unit controls the sludge pump to pump the sludge.

[0048] The shutdown sequence of the microfilter is as follows: the control unit of the filter cartridge stops the water inlet of the control system. At the same time, after n3 seconds, the spray control unit controls the closing of the internal spray pump. And after n4 seconds, the control unit of the filter cartridge controls the closing of the filter cartridge motor. Based on the above shutdown sequence, after the system stops the water inlet, the spray and the drum should continue to operate for n3 seconds (usually 5 minutes) to ensure that the filter screen is washed clean. Sequential shutdown avoids current overload caused by shutting down simultaneously.

[0049] Specifically, the specific values of the above n1, n2, n3, and n4 are set by the operator, and the value of n3 is generally set to 5 minutes.

[0050] The liquid level controller in the control unit of the filter cartridge obtains the values of the inlet and outlet liquid level gauges and the flushing pressure, and simultaneously judges the magnitude relationship between the liquid level difference, the spray pressure and the normal value, and generates different judgment results. The specific judgment method is as follows:

[0051] Denote the inlet water level as H1 and the outlet water level as H2. Calculate the liquid level difference H according to the formula liquid level difference H = outlet water level value H2 - inlet water level value H1. At the same time, compare the liquid level difference H with the normal difference Hy. If the liquid level difference H is greater than the normal difference Hy, it indicates that the filter screen is blocked. Specifically, level gauges are installed at the front and rear ends of the equipment, and the liquid level difference between the two level gauges is used to judge whether there is a blockage. A large liquid level difference indicates serious blockage, and a small liquid level difference indicates less serious blockage. Then, a rotational speed adjustment signal is generated and processed. On the contrary, if the liquid level difference H is less than the normal difference Hy, it indicates that the filter screen is normal, and a normal monitoring signal is generated. The specific value of the normal difference Hy is set by the operator;

[0052] For the generated rotational speed adjustment signal, obtain the current frequency of the cartridge motor, and at the same time judge the current frequency. If the current frequency is the upper limit of the optimal operating frequency, then adjust the spray pressure, generate a frequency adjustment signal, and the maximum operating spray here means that the cartridge motor operates at full frequency. The working frequency adjustment range of the drum motor of the microfilter: 35 Hz - 50 Hz, and the working pressure adjustment range of the backwash pump: 0.5 MPa - 0.75 MPa. When (effluent liquid level value - influent liquid level value) H is in the range of 110 mm to 150 mm, the drum motor has a constant rotational speed and the backwash has a constant pressure. Conversely, if the current frequency does not reach the upper limit of the optimal operating frequency, then adjust the current frequency, generate a secondary analysis signal, and analyze the secondary analysis signal at the same time; when H > 150 mm, adjust the rotational speed of the drum motor, increasing by 3 Hz every 1 min.

[0053] When the motor rotational speed reaches 50 Hz, increase the flushing pressure to 0.75 MPa, and maintain the operating parameters of 50 Hz and 0.75 MPa.

[0054] Analyze the generated frequency adjustment signal, obtain the current frequency, and obtain all the frequencies corresponding to the cartridge machine. Then obtain the high-frequency gear corresponding to the current frequency, and adjust it based on the high-frequency gear to generate control adjustment information. At the same time, analyze the generated secondary analysis signal, adjust the current spray pressure to the maximum value, and the maximum spray pressure here means the maximum pressure borne by the filter screen. Obtain the corresponding liquid level difference Ho after adjustment and record it. At the same time, compare the liquid level difference Ho with the preset difference Hp, and the specific value of the preset difference Hp is set by the operator. If the liquid level difference Ho is greater than the preset difference Hp, it means that the filter screen is severely blocked, and an abnormal alarm signal is generated. When Ho reaches 250 mm, an abnormal alarm is issued and transmitted to the alarm control unit. Conversely, if the liquid level difference Ho is less than the preset difference Hp, then compare the liquid level difference Ho with the preset difference H3, and the specific values of the preset differences Ho and Hp are set by the operator. If the liquid level difference Ho is less than the preset difference H3, it means that the filter screen has a large throughput, and a pressure adjustment signal is generated; when Ho < 110 mm, reduce the spray pressure, decreasing by 0.05 MPa every 1 min until 0.5 MPa.

[0055] At the same time, analyze the generated pressure adjustment signal, obtain the current spray pressure, and compare the spray pressure with the lower limit of the spray working pressure. If the current spray pressure is lower than the lower limit of the spray working pressure, generate a speed reduction analysis signal, and generate pressure adjustment information based on the current spray pressure. For example, adjust the rotational speed of the drum motor, decreasing by 1 Hz every 1 min. After the motor rotational speed drops to 35 Hz, maintain the current rotational speed and working pressure operation, and then transmit it to the alarm control unit.

[0056] An alarm control unit, which is used to display the acquired alarm signals, control adjustment information, and pressure adjustment information to the corresponding operators.

[0057] Embodiment 2. The present application provides a microfilter control method, which specifically includes the following steps:

[0058] Step S1: Obtain the inlet and outlet water level values and the flushing pressure through a liquid level controller, and judge the two values.

[0059] Step S2: Generate a speed adjustment signal and a normal monitoring signal based on the judgment of the inlet and outlet water level values. At the same time, analyze the speed adjustment signal to generate a frequency adjustment signal and a pressure adjustment signal.

[0060] Step S3: Analyze the generated frequency adjustment signal to generate control adjustment information, analyze the pressure adjustment signal, and at the same time analyze the adjusted liquid level difference to generate pressure adjustment information.

[0061] Step S4: Display the generated control adjustment information and pressure adjustment information to the corresponding operators.

[0062] Some of the data in the above formula are numerically calculated after removing their dimensions. At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0063] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A microfiltration machine control system, characterized in that: include: The filter cartridge control unit is used to obtain the inlet and outlet water level values ​​and flushing pressure, and judge the values ​​of the two to generate a normal monitoring signal and a speed adjustment signal, and transmit the speed adjustment signal to the spray control unit; A spray control unit is used to analyze the acquired speed regulation signal, generate a frequency regulation signal and a secondary analysis signal based on the current frequency, and transmit the secondary analysis signal to the sludge pump control unit; The sludge pump control unit is used to analyze the generated frequency adjustment signal to generate control adjustment information, and at the same time analyze the secondary analysis signal based on the adjusted liquid level difference to generate abnormal alarm signal and pressure adjustment signal, and analyze the spray pressure to generate pressure adjustment information, and transmit it to the alarm control unit.

2. A microfiltration machine control system according to claim 1, characterized in that: The filter cartridge control unit includes a liquid level controller, and the liquid level controller also includes water inlet and water outlet liquid level sensors, which are respectively arranged at the water inlet and water outlet of the microfiltration machine to obtain the water inlet and water outlet liquid levels.

3. A microfiltration machine control system according to claim 1, characterized in that: The spray control unit is connected to the backwash pump to control the start and stop and pressure of the backwash pump. The spray control unit also includes a pressure sensor arranged on the external spray pipeline to feed back the external spray flushing pressure.

4. A microfiltration machine control system according to claim 1, characterized in that: The specific method for the filter cartridge control unit to generate the normal monitoring signal and the speed adjustment signal is as follows: The inlet liquid level is recorded as H1, the outlet liquid level is recorded as H2, and the liquid level difference H is calculated according to the formula: liquid level difference H = outlet liquid level value H2 - inlet liquid level value H1. At the same time, the liquid level difference H is compared with the normal difference Hy. If the liquid level difference H is greater than the normal difference Hy, it means that the filter is blocked, and a speed adjustment signal is generated and the speed adjustment signal is processed. Conversely, if the liquid level difference H is less than the normal difference Hy, it means that the filter is normal, and a normal monitoring signal is generated. The specific value of the normal difference Hy is set by the operator.

5. A microfiltration machine control system according to claim 1, characterized in that: The specific method in which the spray control unit analyzes the speed regulation signal is as follows: The current frequency of the filter cartridge motor is obtained and judged. If the current frequency is the upper limit of the optimal working frequency, the spray pressure is adjusted and a frequency adjustment signal is generated. Otherwise, if the current frequency does not reach the upper limit of the optimal working frequency, the current frequency is adjusted and frequency adjustment information is generated. The frequency adjustment information is transmitted to the alarm control unit, and the frequency adjustment signal is analyzed to generate a secondary analysis signal.

6. A microfiltration machine control system according to claim 1, characterized in that: The specific method in which the sludge pump control unit analyzes the frequency adjustment signal to generate the secondary analysis signal is: Get the current frequency and all the frequencies corresponding to the filter cartridge machine, then get the high-frequency gear corresponding to the current frequency, and adjust it based on the high-frequency gear to generate control adjustment information. At the same time, analyze the generated pressure adjustment signal, adjust the current spray pressure to the maximum value, and get the corresponding liquid level difference after adjustment, record it as Ho, and compare the liquid level difference Ho with the preset difference Hp. If the liquid level difference Ho is greater than the preset difference Hp, it means that the filter is seriously clogged, and an abnormal alarm signal is generated and transmitted to the alarm control unit. Otherwise, if the liquid level difference Ho is less than the preset difference Hp, the liquid level difference Ho is compared with the preset difference H3. If the liquid level difference Ho is less than the preset difference H3, it means that the filter flux is large, and a pressure adjustment signal is generated.

7. A microfiltration machine control system according to claim 1, characterized in that: The specific method in which the sludge pump control unit analyzes the pressure regulation signal is as follows: The current spray pressure is obtained and compared with the lower limit of the spray working pressure. If the current spray pressure is lower than the lower limit of the spray working pressure, a speed reduction analysis signal is generated, and pressure adjustment information is generated based on the current spray pressure.

8. A microfiltration machine control system according to claim 1, characterized in that: It also includes an alarm control unit for displaying the acquired normal monitoring signals, abnormal alarm signals, control adjustment information and pressure adjustment information to the corresponding operators.

9. A microfiltration machine control method, executed by a microfiltration machine control system according to any one of claims 1 to 8, characterized in that: The method specifically comprises the following steps: Step S1, obtaining the inlet and outlet water level values ​​and flushing pressure through the liquid level controller, and judging the values ​​of the two; Step S2, generating a speed adjustment signal and a normal monitoring signal based on the determination of the number of inlet and outlet water levels, and analyzing the speed adjustment signal to generate a frequency adjustment signal and a pressure adjustment signal; Step S3, analyzing the generated frequency adjustment signal to generate control adjustment information, analyzing the pressure adjustment signal, and analyzing the liquid level difference after comprehensive adjustment to generate pressure adjustment information; Step S4: display the generated control adjustment information and pressure adjustment information to the corresponding operator.

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