Submerged ultrafiltration membrane detection device

Abstract

The application provides an immersed ultrafiltration membrane detection device, which comprises a control unit, an air source unit, a pressure sensor and an air inlet pipeline; the air source unit is used for being connected with an air inlet end of the immersed ultrafiltration membrane; the pressure sensor is arranged on the air inlet pipeline; the air source unit and the pressure sensor are electrically connected with the control unit; the control unit is used for controlling the air source unit to be opened or closed; the pressure sensor is used for measuring a first pressure value and a second pressure value after a set time; the control unit is used for receiving the first pressure value and the second pressure value, calculating a difference value between the first pressure value and the second pressure value, and judging that the immersed ultrafiltration membrane is damaged when the difference value between the first pressure value and the second pressure value is greater than a set pressure difference value. The immersed ultrafiltration membrane detection device provided by the application has high measurement precision.

Description

Technical Field

[0001] This application relates to the field of immersion ultrafiltration membrane integrity testing technology, and more particularly to an immersion ultrafiltration membrane testing device. Background Technology

[0002] Submerged ultrafiltration membranes are widely used in water purification due to their high flux and strong resistance to fouling.

[0003] During the operation of submerged ultrafiltration membranes, their integrity needs to be monitored to ensure that the effluent quality consistently meets standards. One related technology uses a photoelectric conversion detection device to detect the integrity of the submerged ultrafiltration membrane. This device utilizes the difference in refractive index of light between gases and liquids. Specifically, the device includes a photoelectric converter and a fixed resistor electrically connected to the converter. When gas enters the submerged ultrafiltration membrane due to damage, the light intensity received by the photoelectric converter changes, causing a change in the voltage across the fixed resistor. This change allows the system to determine whether the submerged ultrafiltration membrane has been damaged.

[0004] When using a photoelectric conversion detection device to detect the integrity of an immersed ultrafiltration membrane, the detection error is relatively large. Summary of the Invention

[0005] This application provides an immersion ultrafiltration membrane detection device with high measurement accuracy.

[0006] This application provides an immersion ultrafiltration membrane detection device, including a control unit, a gas source unit, a pressure sensor, and an air inlet pipeline;

[0007] The gas source unit is used to connect to the air inlet of the submerged ultrafiltration membrane through the air inlet pipe. The pressure sensor is installed on the air inlet pipe. Both the gas source unit and the pressure sensor are electrically connected to the control unit.

[0008] The gas supply unit is used to pump air into the submerged ultrafiltration membrane; the control unit is used to control the gas supply unit to open and to control the gas supply unit to close when the pressure inside the submerged ultrafiltration membrane reaches a first pressure value; the pressure sensor is used to measure the first pressure value and to measure the second pressure value after a set time.

[0009] The control unit is used to receive a first pressure value and a second pressure value, calculate the difference between the first pressure value and the second pressure value, and determine that the submerged ultrafiltration membrane is damaged when the difference between the first pressure value and the second pressure value is greater than a set differential pressure value.

[0010] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application includes a control unit comprising a PLC controller and an edge computing terminal electrically connected to the PLC controller, wherein the PLC controller is electrically connected to a pressure sensor.

[0011] The PLC controller receives the first pressure value and the second pressure value, and transmits the first pressure value and the second pressure value to the edge computing terminal. The edge computing terminal calculates the difference between the first pressure value and the second pressure value, and determines that the submerged ultrafiltration membrane is damaged when the difference between the first pressure value and the second pressure value is greater than the set pressure difference value.

[0012] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application has a gas source unit electrically connected to a PLC controller, which is used to control the opening or closing of the gas source unit.

[0013] In one possible implementation, the immersion ultrafiltration membrane detection device provided in this application further includes a switch in the control unit, the switch being electrically connected to an edge computing terminal.

[0014] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application includes an air source unit comprising an air compressor and an intake electric valve. Both the air compressor and the intake electric valve are installed on the intake pipeline and are electrically connected to a PLC controller.

[0015] Air compressors are used to generate gas;

[0016] The air intake electric valve is used to open when it is necessary to pump air into the submerged ultrafiltration membrane, and to close when the gas pressure in the submerged ultrafiltration membrane reaches a first pressure value.

[0017] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application further includes a gas filter in the gas source unit. The gas filter is disposed in the air inlet pipeline and is located between the air compressor and the air inlet electric valve.

[0018] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application further includes a check valve in the gas source unit. The check valve is installed on the air inlet pipeline and is located between the gas filter and the air inlet electric valve.

[0019] In one possible implementation, the submersible ultrafiltration membrane detection device provided in this application further includes a pressure reducing valve in the gas source unit, which is located between the air inlet electric valve and the pressure sensor.

[0020] In one possible implementation, the submerged ultrafiltration membrane detection device provided in this application further includes a manual valve in the air source unit. The manual valve is installed on the air inlet pipe and is located between the pressure sensor and the air inlet end of the submerged ultrafiltration membrane.

[0021] In one possible implementation, the submerged ultrafiltration membrane detection device provided in this application further includes an exhaust unit and an exhaust pipeline. The exhaust unit is used to connect to the exhaust end of the submerged ultrafiltration membrane through the exhaust pipeline, and the exhaust unit is electrically connected to the control unit.

[0022] After the test is completed, the control unit controls the exhaust unit to open and discharge the gas from the submerged ultrafiltration membrane.

[0023] This application provides an immersion ultrafiltration membrane detection device, comprising a control unit, a gas source unit, a pressure sensor, and an air inlet pipe. The gas source unit is connected to the immersion ultrafiltration membrane, and the pressure sensor is located on the air inlet pipe. Both the gas source unit and the pressure sensor are electrically connected to the control unit. The gas source unit is used to pump air into the immersion ultrafiltration membrane. The control unit is used to control the opening and closing of the gas source unit. The pressure sensor is used to measure a first pressure value and a second pressure value. The control unit is used to calculate the difference between the first pressure value and the second pressure value, and if the difference between the first pressure value and the second pressure value is greater than a set pressure difference value, it is determined that the immersion ultrafiltration membrane is damaged. The measurement medium of the immersion ultrafiltration membrane detection device is only the gas generated by the gas source unit. The composition of the gas medium is uniform, making the measurement results more accurate. At the same time, whether the immersion ultrafiltration membrane is damaged can be directly reflected by the change in gas pressure. The detection error of the immersion ultrafiltration membrane detection device is small, and the detection accuracy is high. The entire process of integrity testing of submerged ultrafiltration membranes is carried out under the control of the control unit, which can avoid human error or time error in human operation, thereby further improving the detection accuracy of the submerged ultrafiltration membrane testing device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a diagram illustrating the usage status of photoelectric conversion detection devices in related technologies;

[0026] Figure 2 This is a schematic diagram of the structure of the immersion ultrafiltration membrane detection device provided in the embodiments of this application;

[0027] Figure 3 The usage status of the submersible ultrafiltration membrane detection device provided in the embodiments of this application. Figure 1 ;

[0028] Figure 4The usage status of the submersible ultrafiltration membrane detection device provided in the embodiments of this application. Figure 2 .

[0029] Explanation of reference numerals in the attached figures:

[0030] 10-Photoelectric conversion unit; 11-Laser emitter; 12-Optical measuring instrument; 13-Photoelectric converter; 14-Fixed resistor; 15-Power supply; 16-Data acquisition card;

[0031] 20 - Water circuit unit; 21 - Water pump; 22 - Water pipe;

[0032] 30 - Air circuit unit; 31 - Air pipe; 32 - Aeration pump; 33 - Gas flow meter; 34 - Aeration head;

[0033] 40 - Reactor;

[0034] 50 - Computer;

[0035] 100-Immersion ultrafiltration membrane;

[0036] 200-Immersion Ultrafiltration Membrane Detection Device;

[0037] 210 - Control unit; 211 - PLC controller; 2111 - First pin; 2112 - Second pin; 2113 - Third pin; 2114 - Fourth pin; 212 - Edge computing terminal; 213 - Switch;

[0038] 220 - Air source unit; 221 - Air compressor; 222 - Inlet electric valve; 223 - Gas filter; 224 - Check valve; 225 - Pressure reducing valve; 226 - Manual valve;

[0039] 230 - Pressure sensor;

[0040] 240 - Intake pipe;

[0041] 250-exhaust unit;

[0042] 260 - Exhaust pipe. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0047] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0048] Submerged ultrafiltration membranes are widely used in water purification due to their high flux and strong resistance to fouling.

[0049] The process of water purification using submerged ultrafiltration membranes is as follows: Under certain pressure, when the raw liquid flows through the surface of the submerged ultrafiltration membrane, the numerous tiny micropores densely distributed on the membrane surface allow only water and small molecules to pass through, becoming the permeate. Substances in the raw liquid with a volume larger than the micropore size of the submerged ultrafiltration membrane are retained on the feed side of the membrane, becoming the concentrate. This achieves the purification, separation, and concentration of the raw liquid. Each meter of ultrafiltration membrane fiber wall has multiple micron-sized micropores, whose pore size only allows water molecules, beneficial minerals, and trace elements to pass through. Bacteria, as well as larger colloids, rust, suspended solids, silt, and large organic molecules, are retained by the ultrafiltration membrane, thus achieving the purification process.

[0050] Therefore, during the operation of submerged ultrafiltration membranes, it is necessary to test their integrity to ensure that the quality of the effluent can meet the standards stably in the long term.

[0051] In related technologies, the integrity of submerged ultrafiltration membranes is detected using a photoelectric conversion detection device. This device utilizes the difference in refractive index of light between gases and liquids for detection.

[0052] Figure 1 This is a diagram showing the usage status of photoelectric conversion detection devices in related technologies.

[0053] First refer to Figure 1 The structure of the photoelectric conversion detection device is described below. The photoelectric conversion detection device includes a photoelectric conversion unit 10, a water circuit unit 20, a gas circuit unit 30, a reactor 40, and a computer 50.

[0054] The photoelectric conversion unit 10 includes a laser emitter 11, an optical measuring device 12, a photoelectric converter 13, a fixed resistor 14, a power supply 15, and a data acquisition card 16. The photoelectric converter 13, the fixed resistor 14, and the power supply 15 form a circuit. The power supply 15 supplies power to the photoelectric converter 13 and the fixed resistor 14. The data acquisition card 16 is connected in parallel across the fixed resistor 14 and is electrically connected to the computer 50. The laser emitter 11 and the photoelectric converter 13 are located on opposite sides of the optical measuring device 12.

[0055] The water circuit unit 20 includes a water pump 21 and a water pipe 22. One end of the water pipe 22 is connected to the optical measuring device 12, and the other end of the water pipe 22 extends into the reactor 40. The water pump 21 is mounted on the water pipe 22.

[0056] The gas path unit 30 includes an air pipe 31, an aeration pump 32, a gas flow meter 33, and an aeration head 34. The aeration pump 32 is mounted on the air pipe 31, with the end of the air pipe 31 extending into the reactor 40. The aeration head 34 is located at the end of the air pipe 31 and is mounted on the bottom wall of the reactor 40. The gas flow meter 33 is located on the air pipe 31.

[0057] The submerged ultrafiltration membrane 100 is located in reactor 40, which contains the test liquid. Figure 1 In the test liquid, the test liquid is represented by a dotted filling pattern. The submerged ultrafiltration membrane 100 is also located in the reactor 40 and is connected to the optical measuring instrument 12.

[0058] The process of detecting the integrity of the submerged ultrafiltration membrane 100 using a photoelectric conversion detection device will be described below.

[0059] When the water pump 21 is started, the test liquid in the reactor 40 flows sequentially through the micropores in the submerged ultrafiltration membrane 100, the optical measuring device 12, and the water pipe 22 under the action of the water pump 21, and flows back to the reactor 40 from the other end of the water pipe 22; at the same time, the aeration pump 32 is started, and the bubbles generated by the aeration pump 32 enter the reactor 40 sequentially through the gas flow meter 33 and the aeration head 34.

[0060] The laser emitted by laser emitter 11 passes through optical measuring device 12 and is received by photoelectric converter 13. Photoelectric converter 13 converts the received optical signal into an electrical signal and generates a voltage across fixed resistor 14. Data acquisition card 16 acquires the voltage signal across fixed resistor 14 and transmits the acquired voltage signal to computer 50. Computer 50 displays the changes in voltage signal in real time and determines whether the submerged ultrafiltration membrane 100 is damaged based on the changes in voltage signal.

[0061] Specifically, if the submerged ultrafiltration membrane 100 is damaged, bubbles generated by the aeration head 34 will enter the submerged ultrafiltration membrane 100 through the damaged area and flow through the optical measuring device 12. When the bubbles flow through the optical measuring device 12, the laser emitted by the laser emitter 11 changes from liquid to gas as it passes through the optical measuring device 12, causing the laser to be scattered and its intensity to decrease. The light intensity received by the photoelectric converter 13 decreases, resulting in a decrease in the voltage across the fixed resistor 14. The computer 50 will display a voltage decrease, and the user can determine that the submerged ultrafiltration membrane 100 is damaged based on the display result of the computer 50. When the submerged ultrafiltration membrane 100 is not damaged, bubbles will not enter the submerged ultrafiltration membrane 100 and flow through the optical measuring device 12. The laser light intensity received by the photoelectric converter 13 is constant, thus the voltage across the fixed resistor 14 is stable, and the voltage signal displayed by the computer 50 remains unchanged.

[0062] However, under actual operating conditions, the liquid being measured in reactor 40 is the same liquid to be purified. Therefore, the water quality in reactor 40 is often unevenly distributed. Even if the submerged ultrafiltration membrane 100 is not damaged, and air bubbles do not enter the submerged ultrafiltration membrane 100 and flow through the optical measuring device 12, laser light still scatters in the uneven water quality. The light intensity received by the photoelectric converter 13 still varies, causing the voltage across the fixed resistor 14 to change. It is difficult for the user to determine whether the submerged ultrafiltration membrane 100 is damaged based on the display results on the computer 50. Therefore, when detecting the integrity of the submerged ultrafiltration membrane 100 using a photoelectric conversion detection device, the detection error is large and the detection accuracy is low.

[0063] Based on this, this application provides an immersion ultrafiltration membrane detection device with high measurement accuracy.

[0064] Figure 2 This is a schematic diagram of the structure of the immersion ultrafiltration membrane detection device provided in the embodiments of this application; Figure 3 The usage status of the submersible ultrafiltration membrane detection device provided in the embodiments of this application. Figure 1 See also Figure 2 and Figure 3 As shown, the submerged ultrafiltration membrane detection device 200 provided in this application includes a control unit 210, a gas source unit 220, a pressure sensor 230, and an air inlet pipe 240. The gas source unit 220 is connected to the air inlet end of the submerged ultrafiltration membrane 100 through the air inlet pipe 240. The pressure sensor 230 is installed on the air inlet pipe 240. Both the gas source unit 220 and the pressure sensor 230 are electrically connected to the control unit 210. The gas source unit 220 is used to pump air into the submerged ultrafiltration membrane 100. The control unit 210 is used to control the gas source unit 220 to open and to control the gas source unit 220 to close when the pressure inside the submerged ultrafiltration membrane 100 reaches a first pressure value. The pressure sensor 230 is used to measure the first pressure value and to measure a second pressure value after a set time. The control unit 210 is used to receive the first pressure value and the second pressure value, calculate the difference between the first pressure value and the second pressure value, and determine that the submerged ultrafiltration membrane 100 is damaged when the difference between the first pressure value and the second pressure value is greater than a set pressure difference value.

[0065] First, the structure of the immersion ultrafiltration membrane detection device 200 will be explained.

[0066] Please continue reading Figure 2 and Figure 3 As shown, one end of the air inlet pipe 240 is connected to the air source unit 220, and the other end is connected to the submerged ultrafiltration membrane 100. The gas generated by the air source unit 220 can be delivered to the submerged ultrafiltration membrane 100 through the air inlet pipe 240. The air source unit 220 can be a gas generator or an air compressor. Throughout the detection process, the composition of the gas medium generated by the air source unit 220 is uniform.

[0067] A pressure sensor 230 is also installed on the air inlet pipe 240. The pressure sensor 230 is used to measure the pressure change in the submerged ultrafiltration membrane 100. The pressure sensor 230 can be a high-precision pressure sensor, so that even small pressure changes in the submerged ultrafiltration membrane 100 can be measured.

[0068] The control unit 210 is electrically connected to the gas source unit 220, and the control unit 210 can control the opening or closing of the gas source unit 220. Specifically, when it is necessary to pump air into the submerged ultrafiltration membrane 100, the control unit 210 controls the gas source unit 220 to open; when it is not necessary to pump air into the submerged ultrafiltration membrane 100, the control unit 210 controls the gas source unit 220 to close.

[0069] The control unit 210 is also electrically connected to the pressure sensor 230, and the pressure value measured by the pressure sensor 230 can be transmitted to the control unit 210.

[0070] The process of detecting the integrity of the submerged ultrafiltration membrane 100 by the submerged ultrafiltration membrane detection device 200 is described below.

[0071] Control unit 210 controls the gas supply unit 220 to open. The gas supply unit 220 pumps air into the submerged ultrafiltration membrane 100 through the air inlet pipe 240. The gas is sealed inside the submerged ultrafiltration membrane 100. Pressure sensor 230 measures the pressure in the submerged ultrafiltration membrane 100 and transmits the measured pressure value to control unit 210. As the gas supply unit 220 continues to pump air into the submerged ultrafiltration membrane 100, the pressure in the submerged ultrafiltration membrane 100 gradually increases. Control unit 210 has a preset first pressure value. When the pressure of the gas in the submerged ultrafiltration membrane 100 reaches the first pressure value, control unit 210 controls the gas supply unit 220 to close.

[0072] The submerged ultrafiltration membrane 100 enters a pressure-holding state. The pressure-holding time can be set according to the specific membrane material of the submerged ultrafiltration membrane 100. If the pressure-holding time is too short, it is not possible to effectively measure whether the submerged ultrafiltration membrane 100 has been damaged. If the pressure-holding time is too long, the submerged ultrafiltration membrane 100 is at risk of being damaged by pressurized gas. The pressure-holding time is called the set time. In this embodiment, the set time is 1-2 minutes. It should be noted that the set time is also preset in the control unit 210.

[0073] After the set time expires, the pressure sensor 230 measures the pressure in the submerged ultrafiltration membrane 100 again and transmits the measured pressure value to the control unit 210. This pressure value is called the second pressure value.

[0074] After receiving the second pressure value, the control unit 210 calculates the difference between the first pressure value and the second pressure value. The control unit 210 has a preset differential pressure value. It should be noted that the preset differential pressure value also needs to be set according to the specific membrane material of the submerged ultrafiltration membrane 100. In this embodiment, the preset differential pressure value is 0.2 bar.

[0075] The control unit 210 compares the difference between the first and second pressure values ​​with a set differential pressure value. If the difference is greater than the set differential pressure value (0.2 bar), it indicates that a significant amount of gas is leaking from the submerged ultrafiltration membrane 100, meaning there is damage to the membrane. If the difference is less than the set differential pressure value, it indicates that a small amount of gas is leaking from the submerged ultrafiltration membrane 100, meaning there is no damage. In other words, the entire integrity detection process of the submerged ultrafiltration membrane 100 is performed under the control of the control unit 210. This avoids human error or time-related errors, resulting in higher detection accuracy for the submerged ultrafiltration membrane detection device 200.

[0076] The submerged ultrafiltration membrane testing device 200 uses only gas as its measuring medium. Compared to related technologies that use non-uniform liquids as the measuring medium, the gas medium generated by the gas source unit 220 has a uniform composition, resulting in more accurate measurement results. Furthermore, the presence of damage to the submerged ultrafiltration membrane 100 can be directly reflected by changes in gas pressure. Compared to related technologies that indirectly reflect the presence of damage through voltage changes, the submerged ultrafiltration membrane testing device 200 has a smaller detection error and higher detection accuracy.

[0077] The submerged ultrafiltration membrane detection device 200 provided in this application comprises a control unit 210, a gas source unit 220, a pressure sensor 230, and an air inlet pipe 240. The gas source unit 220 is connected to the submerged ultrafiltration membrane 100, and the pressure sensor 230 is mounted on the air inlet pipe 240. Both the gas source unit 220 and the pressure sensor 230 are electrically connected to the control unit 210. The gas source unit 220 is used to pump air into the submerged ultrafiltration membrane 100. The control unit 210 is used to control the opening and closing of the gas source unit 220. The pressure sensor 230 is used to measure a first pressure value and a second pressure value. The control unit 210 is used to calculate the difference between the first pressure value and the second pressure value, and determines that the submerged ultrafiltration membrane 100 is damaged when the difference between the first pressure value and the second pressure value is greater than a set pressure difference value. The measuring medium of the submerged ultrafiltration membrane detection device 200 is only the gas generated by the gas source unit 220, and the composition of the gas medium is uniform, making the measurement results more accurate. Meanwhile, the presence of damage to the submerged ultrafiltration membrane 100 can be directly reflected by changes in gas pressure. The submerged ultrafiltration membrane detection device 200 has a small detection error and high detection accuracy. The entire process of integrity detection of the submerged ultrafiltration membrane 100 is carried out under the control of the control unit 210, which can avoid human error or time errors caused by human operation, thereby further improving the detection accuracy of the submerged ultrafiltration membrane detection device 200.

[0078] The specific components of the control unit 210 will now be described.

[0079] Please continue reading Figure 2 and Figure 3 As shown, the control unit 210 includes a PLC controller 211 and an edge computing terminal 212 electrically connected to the PLC controller 211. The PLC controller 211 is electrically connected to a pressure sensor. The PLC controller 211 is used to receive a first pressure value and a second pressure value, and transmit the first pressure value and the second pressure value to the edge computing terminal 212. The edge computing terminal 212 is used to calculate the difference between the first pressure value and the second pressure value, and when the difference between the first pressure value and the second pressure value is greater than a set pressure difference value, it determines that the submerged ultrafiltration membrane 100 has been damaged.

[0080] The PLC controller 211 has a first pin 2111. The pressure sensor 230 is electrically connected to the PLC controller 211 through the first pin 2111 to transmit the first pressure value and the second pressure value collected by the pressure sensor 230 to the PLC controller 211.

[0081] After receiving the first pressure value and the second pressure value from the PLC controller 211, the edge computing terminal 212 calculates the difference between the first pressure value and the second pressure value. The edge computing terminal 212 has a preset pressure difference value. It compares the difference between the first pressure value and the second pressure value with the preset pressure difference value. If the difference between the first pressure value and the second pressure value is greater than the preset pressure difference value, it indicates that a significant amount of gas is leaking from the submerged ultrafiltration membrane 100, meaning that the submerged ultrafiltration membrane 100 is damaged. If the difference between the first pressure value and the second pressure value is less than the preset pressure difference value, it indicates that a small amount of gas is leaking from the submerged ultrafiltration membrane 100, meaning that the submerged ultrafiltration membrane 100 is not damaged.

[0082] The first and second pressure values ​​are transmitted to the edge computing terminal 212 via the PLC controller 211, where calculations are performed. This eliminates the need for manual recording of the first and second pressure values, thus avoiding time errors associated with manual recording. The edge computing terminal 212 provides the nearest-end service directly near the data source, thereby reducing the data transfer process over the network and improving data processing speed.

[0083] Please continue reading Figure 2 and Figure 3 As shown, the gas source unit 220 is electrically connected to the PLC controller 211, which is used to control the opening or closing of the gas source unit 220.

[0084] The controller 211 controls the opening or closing of the gas source unit 220 according to the opening and closing instructions in the edge computing terminal 212, thereby avoiding human error.

[0085] Please continue reading Figure 2 and Figure 3 As shown, the control unit 210 also includes a switch 213, which is electrically connected to the edge computing terminal 212.

[0086] Switch 213 can transmit data from edge computing terminal 212 to the cloud, thereby enabling remote detection.

[0087] The specific structure of the gas source unit 220 will be described below.

[0088] The air source unit 220 includes an air compressor 221 and an intake electric valve 222. Both the air compressor 221 and the intake electric valve 222 are installed on the intake pipeline 240. Both the air compressor 221 and the intake electric valve 222 are electrically connected to the PLC controller 211. The air compressor 221 is used to generate gas. The intake electric valve 222 is used to open when it is necessary to pump air into the submerged ultrafiltration membrane 100, and to close when the pressure of the gas in the submerged ultrafiltration membrane 100 reaches a first pressure value.

[0089] Specifically, the PLC controller 211 has a second pin 2112, through which the air compressor 221 is electrically connected to the PLC controller 211. The PLC controller 211 also has a third pin 2113, through which the intake electric valve 222 is electrically connected to the PLC controller 211.

[0090] PLC controller 211 controls the air compressor 221 to turn on, and simultaneously controls the intake electric valve 222 to open, allowing gas to enter the submerged ultrafiltration membrane 100 via the intake electric valve 222. When the gas pressure in the submerged ultrafiltration membrane 100 reaches a first pressure value, PLC controller 211 controls the air compressor 221 and the intake electric valve 222 to close.

[0091] In this embodiment, the detection gas is generated by the air compressor 221, thereby enabling the gas pressure in the submerged ultrafiltration membrane 100 to quickly reach the first set value.

[0092] In this embodiment, the air source unit 220 further includes a gas filter 223, which is disposed in the air intake pipe 240 and located between the air compressor 221 and the air intake electric valve 222.

[0093] Gas filter 223 is used to filter impurities and water vapor in the gas produced by air compressor 221, thereby preventing impurities and water vapor in the gas from entering the interior of submerged ultrafiltration membrane 100 and damaging the submerged ultrafiltration membrane 100.

[0094] To prevent gas from flowing in the reverse direction toward the air compressor 221, the air source unit 220 also includes a check valve 224, which is installed on the air inlet pipe 240 and is located between the gas filter 223 and the air inlet electric valve 222.

[0095] Please continue reading Figure 2 and Figure 3 As shown, the air source unit 220 also includes a pressure reducing valve 225, which is located between the intake electric valve 222 and the pressure sensor 230.

[0096] The pressure reducing valve 225 is used to reduce the pressure of the gas generated by the air compressor 221, thereby ensuring the pressure of the air source unit 220 is stable and preventing the gas generated by the air source unit 220 from being over-pressurized and thus damaging the submerged ultrafiltration membrane 100.

[0097] Please continue reading Figure 2 and Figure 3 As shown, in some embodiments, the gas source unit 220 further includes a manual valve 226, which is disposed on the air inlet pipe 240 and located between the pressure sensor 230 and the air inlet end of the submerged ultrafiltration membrane 100.

[0098] When maintenance is required on the gas source unit 220, the manual valve 226 can be closed to disconnect the connection between the submerged ultrafiltration membrane 100 and the gas source unit 220. Therefore, the gas source unit 220 can be maintained without removing it from the submerged ultrafiltration membrane 100.

[0099] Figure 4 The usage status of the submersible ultrafiltration membrane detection device provided in the embodiments of this application. Figure 2 .

[0100] See Figure 4 As shown, the submerged ultrafiltration membrane testing device 200 also includes an exhaust unit 250 and an exhaust pipe 260. The exhaust unit 250 is used to connect to the exhaust end of the submerged ultrafiltration membrane 100 through the exhaust pipe 260. The exhaust unit 250 is electrically connected to the control unit 210. After the test is completed, the control unit 210 controls the exhaust unit 250 to open and discharge the gas in the submerged ultrafiltration membrane 100.

[0101] The exhaust unit 250 is the exhaust electric valve. The PLC controller 211 has a fourth pin 2114, and the exhaust electric valve is electrically connected to the PLC controller 211 in the control unit 210 through the fourth pin 2114. After the pressure holding state ends, the PLC controller 211 controls the exhaust electric valve to open, and the gas in the submerged ultrafiltration membrane 100 is discharged through the exhaust pipe 260 and the exhaust electric valve, thereby completing the integrity detection of the submerged ultrafiltration membrane 100.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An immersion ultrafiltration membrane detection device, characterized in that, Includes a control unit, an air supply unit, a pressure sensor, and an intake pipe; The gas source unit is used to connect to the air inlet end of the submerged ultrafiltration membrane through the air inlet pipe. The pressure sensor is installed on the air inlet pipe. Both the gas source unit and the pressure sensor are electrically connected to the control unit. The gas source unit is used to pump air into the submerged ultrafiltration membrane; the control unit is used to control the gas source unit to open, and to control the gas source unit to close when the pressure inside the submerged ultrafiltration membrane reaches a first pressure value; the pressure sensor is used to measure the first pressure value and to measure a second pressure value after a set time. The control unit is used to receive the first pressure value and the second pressure value, calculate the difference between the first pressure value and the second pressure value, and determine that the submerged ultrafiltration membrane is damaged when the difference between the first pressure value and the second pressure value is greater than a set pressure difference value. The control unit includes a PLC controller and an edge computing terminal electrically connected to the PLC controller, wherein the PLC controller is electrically connected to the pressure sensor. The PLC controller is used to receive the first pressure value and the second pressure value, and transmit the first pressure value and the second pressure value to the edge computing terminal. The edge computing terminal is used to calculate the difference between the first pressure value and the second pressure value, and when the difference between the first pressure value and the second pressure value is greater than a set pressure difference value, it is determined that the submerged ultrafiltration membrane is damaged. The set time is 1-2 minutes, and the set pressure difference is 0.2 bar. The gas source unit also includes a manual valve, which is installed on the air inlet pipe and located between the pressure sensor and the air inlet end of the submerged ultrafiltration membrane.

2. The immersion ultrafiltration membrane detection device according to claim 1, characterized in that, The gas source unit is electrically connected to the PLC controller, which is used to control the opening or closing of the gas source unit.

3. The immersion ultrafiltration membrane detection device according to claim 2, characterized in that, The control unit also includes a switch, which is electrically connected to the edge computing terminal.

4. The immersion ultrafiltration membrane detection device according to any one of claims 1 to 3, characterized in that, The air source unit includes an air compressor and an intake electric valve. Both the air compressor and the intake electric valve are installed on the intake pipeline, and both the air compressor and the intake electric valve are electrically connected to the PLC controller. The air compressor is used to generate gas; The air intake electric valve is used to open when it is necessary to inject air into the submerged ultrafiltration membrane, and to close when the pressure of the gas in the submerged ultrafiltration membrane reaches a first pressure value.

5. The immersion ultrafiltration membrane detection device according to claim 4, characterized in that, The gas source unit also includes a gas filter, which is disposed in the air intake pipeline and located between the air compressor and the air intake electric valve.

6. The immersion ultrafiltration membrane detection device according to claim 5, characterized in that, The gas source unit also includes a check valve, which is installed on the air inlet pipe and located between the gas filter and the air inlet electric valve.

7. The immersion ultrafiltration membrane detection device according to claim 6, characterized in that, The gas source unit also includes a pressure reducing valve, which is located between the intake electric valve and the pressure sensor.

8. The immersion ultrafiltration membrane detection device according to any one of claims 1 to 3, characterized in that, The submerged ultrafiltration membrane detection device further includes an exhaust unit and an exhaust pipeline. The exhaust unit is used to connect to the exhaust end of the submerged ultrafiltration membrane through the exhaust pipeline, and the exhaust unit is electrically connected to the control unit. After the detection is completed, the control unit controls the exhaust unit to open and discharge the gas from the submerged ultrafiltration membrane.

Images