Concentrated water separation net inspection device and inspection method

Abstract

The invention discloses a concentrated water separation net inspection device and an inspection method. The concentrated water separation net inspection device comprises a test unit, a water tank, a circulation assembly, an injection unit and an image acquisition device. The testing unit is used for accommodating the concentrated water separation net, the water inlet end of the testing unit is connected with a water inlet pipe, the water outlet end of the testing unit is connected with a water outlet pipe, and a water pump is arranged in the water inlet pipe. The water outlet end of the water tank is connected with the water inlet end of the water inlet pipe; the circulating assembly comprises a circulating pipeline and a circulating valve, the water outlet end of the circulating pipeline is connected with the water inlet end of the water inlet pipe, the water inlet end of the circulating pipeline is connected with the water outlet end of the water outlet pipe, and the circulating valve is arranged on the circulating pipeline; the liquid outlet end of the injection unit is connected with the water inlet end of the test unit, and the injection unit is used for injecting a tracer into the test unit; and the image acquisition device is used for shooting the diffusion condition of the tracer agent in the test unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reverse osmosis filtration, and in particular to a concentrated water screen inspection device and method. BACKGROUND

[0002] Reverse osmosis technology is one of the core technologies in the field of water treatment, and is widely used in seawater desalination, industrial wastewater reuse, and drinking water purification. In reverse osmosis membrane elements, the concentrated water screen is a key structural component, and its main function is to provide a flow channel for raw water and promote water flow to form turbulence through its mesh structure. Good turbulence effect can effectively destroy the concentration polarization boundary layer on the membrane surface, inhibit solute deposition and scaling, thereby significantly improving the desalination efficiency of the membrane element and prolonging its service life.

[0003] Traditional methods for inspecting the quality of concentrated water screens mainly focus on detecting physical and geometric parameters such as screen thickness, grid density, and included angle. These parameters have weak relevance to actual fluid dynamics performance and cannot directly reflect the turbulence promotion ability of the screen under actual working conditions. If accurate evaluation is required, the screen usually needs to be wound into a complete membrane element for long-term operation test. This method has a long cycle and high cost, and is difficult to meet the batch and rapid quality inspection requirements on the production line. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, the present application provides a concentrated water screen inspection device and method.

[0005] In a first aspect, the present application provides a concentrated water screen inspection device, comprising: a test unit for accommodating a concentrated water screen, the test unit having a transparent window of a visible inner cavity, a water inlet end of the test unit being connected with a water inlet pipe, a water outlet end of the test unit being connected with a water outlet pipe, and a water pump being arranged in the water inlet pipe; a water tank, a water outlet end of the water tank being connected with a water inlet end of the water inlet pipe, and a water inlet end of the water tank being connected with a water outlet end of the water outlet pipe; a circulation assembly, comprising a circulation pipeline and a circulation valve, a water outlet end of the circulation pipeline being connected with a water inlet end of the water inlet pipe, a water inlet end of the circulation pipeline being connected with a water outlet end of the water outlet pipe, and the circulation valve being arranged in the circulation pipeline; an injection unit, a liquid outlet end of the injection unit being connected with a water inlet end of the test unit, the injection unit being used for injecting a tracer into the test unit; an image acquisition device for capturing the diffusion of the tracer in the test unit through the transparent window.

[0006] The test unit comprises a shell and a transparent cover plate, the transparent cover plate constitutes the transparent window, the shell has an inner cavity and an opening facing upward, the transparent cover plate is used for sealing the opening of the shell, a water inlet end of the shell is connected with the water inlet pipe, and a water outlet end of the shell is connected with the water outlet pipe.

[0007] According to some embodiments of the present application, the water inlet end of the shell is provided with a mixing stabilizer, a water outlet end of the water inlet pipe is connected with the mixing stabilizer, and a liquid outlet end of the injection unit is connected with the mixing stabilizer.

[0008] According to some embodiments of the present application, the concentrated water screen inspection device further comprises a first pipe and a first valve, a water outlet end of the water tank is connected with a water inlet end of the first pipe, a water outlet end of the first pipe is connected with a water inlet end of the water inlet pipe, and the first valve is arranged in the first pipe.

[0009] According to some embodiments of the present application, the concentrated water screen inspection device further comprises a second pipe and a second valve, a water inlet end of the water tank is connected with a water outlet end of the second pipe, a water inlet end of the second pipe is connected with a water outlet end of the water outlet pipe, and the second valve is arranged in the second pipe.

[0010] According to some embodiments of the present application, the water inlet pipe is provided with a flow rate control unit, the flow rate control unit is located between the water pump and the water inlet end of the test unit.

[0011] According to some embodiments of the present application, the concentrated water screen inspection device further comprises a third pipe and a third valve, a liquid outlet end of the injection unit is connected with a water inlet end of the third pipe, a water outlet end of the third pipe is connected with a water inlet end of the test unit, and the third valve is arranged in the third pipe.

[0012] According to some embodiments of the present application, the water pump is a constant flow pump.

[0013] According to some embodiments of the present application, the image acquisition device is located above the shell and photographs downward.

[0014] The concentrated water screen inspection device according to the embodiments of the present application has at least the following technical effects: 1, the test unit is placed in the water to be tested, close the circulating valve, open the water inlet and outlet of the water tank, start the water pump, make the water flow between the inlet pipe, test unit, outlet pipe and water tank for a certain time, so as to remove the gas in the pipe, make the gas enter the water tank; Then, open the circulating valve, close the water inlet and outlet of the water tank, start the water pump, make the water flow between the circulating pipeline, inlet pipe, test unit and outlet pipe for a certain time, so that the water flow is stable; Then, control the injection unit, make the injection unit inject tracer into the test unit, start the image acquisition device, take pictures of the diffusion of tracer in the test unit every certain time, finally, fit the diffusion area of tracer with diffusion time into a curve, and obtain the turbulent diffusion efficiency.

[0015] 2, after the system exhaust is completed, the circulating assembly is isolated from the water tank by the switching valve to form an independent and constant volume circulating system, so that the flow field can continue to run in a closed environment until it reaches a completely stable state, avoiding the disturbance of external factors such as water level change of the water tank; And, the tracer injected subsequently can be effectively prevented from being diluted by a large amount of clean water in the water tank, so as to ensure that the tracer has sufficient concentration and duration in the test circuit to enable the image acquisition device to clearly capture its diffusion process.

[0016] In the second aspect, the embodiment of the present application also provides a test method, which comprises the concentrated water screen test device according to the first aspect of the present application, and the test method comprises the following steps: S100: placing the water screen to be tested in the test unit; S200: closing the circulating valve, opening the water inlet and outlet of the water tank, and starting the water pump to make the water flow between the inlet pipe, test unit, outlet pipe and water tank for a certain time; S300: open the circulating valve, close the water inlet and outlet of the water tank, start the water pump, make the water flow between the circulating pipeline, inlet pipe, test unit and outlet pipe for a certain time; S400: control the injection unit, make the injection unit inject tracer into the test unit, start the image acquisition device, take pictures of the diffusion of tracer in the test unit every certain time; S500: fit the diffusion area of tracer with diffusion time into a curve, and obtain the turbulent diffusion efficiency.

[0017] According to the test method of the embodiment of the present application, the test method is realized by the concentrated water screen test device, and the turbulent diffusion efficiency of the concentrated water screen can be conveniently obtained.

[0018] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein: Figure 1 is a structural schematic diagram of a concentrated water screen inspection device of some embodiments of the present application; Figure 2 is a structural schematic diagram of a test unit of some embodiments of the present application; Figure 3 is a test value diagram of different specifications of concentrated water screens of some embodiments of the present application.

[0020] Reference Signs: Test unit 100; water inlet pipe 110; water outlet pipe 120; water pump 130; shell 141; transparent cover plate 142; mixing stabilizer 143; flow rate control unit 150; Water tank 200; first pipe 210; first valve 211; second pipe 220; second valve 221; Circulation assembly 300; circulation pipe 310; circulation valve 311; Injection unit 400; third pipe 410; third valve 411. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein the same or similar components are denoted by the same or similar reference numerals, and examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are for the purpose of explaining the present application only, and should not be understood as limiting the present application.

[0022] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore should not be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0023] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, within, etc. is understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0024] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0025] The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0026] According to some embodiments of the present application, with reference to Figure 1 and Figure 2 , the concentrated water screen inspection device includes a test unit 100, a water tank 200, a circulating assembly 300, an injection unit 400 and an image acquisition device. The test unit 100 is used to accommodate the concentrated water screen, the test unit 100 has a transparent window through which the inner cavity can be seen, the water inlet end of the test unit 100 is connected with a water inlet pipe 110, the water outlet end of the test unit 100 is connected with a water outlet pipe 120, and a water pump 130 is arranged in the water inlet pipe 110. The water outlet end of the water tank 200 is connected with the water inlet end of the water inlet pipe 110, and the water inlet end of the water tank 200 is connected with the water outlet end of the water outlet pipe 120. The circulating assembly 300 includes a circulating pipeline 310 and a circulating valve 311, the water outlet end of the circulating pipeline 310 is connected with the water inlet end of the water inlet pipe 110, the water inlet end of the circulating pipeline 310 is connected with the water outlet end of the water outlet pipe 120, and the circulating valve 311 is arranged in the circulating pipeline 310. The liquid outlet end of the injection unit 400 is connected with the water inlet end of the test unit 100, and the injection unit 400 is used to inject a tracer into the test unit 100. The image acquisition device is used to shoot the diffusion of the tracer in the test unit 100 through the transparent window.

[0027] When it is necessary to inspect the concentrated water screen, the concentrated water screen to be tested is placed in the test unit 100, the circulating valve 311 is closed, the water inlet and outlet of the water tank 200 are opened, and the water pump 130 is started, the water in the water tank 200 enters the water inlet pipe 110, and the water circulates between the water inlet pipe 110, the test unit 100, the water outlet pipe 120 and the water tank 200 for a certain period of time, so as to remove the gas in the pipe, when the gas enters the water tank 200, it will float to the water tank 200 and be discharged upward to the atmosphere, avoiding the gas re-entering the pipe, so as to avoid the gas forming air resistance and causing uneven water flow distribution, and interfering with the ink diffusion trajectory.

[0028] Subsequently, the circulation valve 311 is opened, the water inlet and outlet of the water tank 200 are closed, the water pump 130 is kept on, and the water is circulated between the circulation pipeline 310, the water inlet pipeline 110, the test unit 100 and the water outlet pipeline 120 for a certain time, so that the water flows stably and the water in the water tank 200 is prevented from diluting the tracer introduced subsequently. Then, the injection unit 400 is controlled to inject the tracer into the test unit 100, the image acquisition device is turned on, and the diffusion of the tracer in the test unit 100 is photographed every certain time. Finally, the diffusion area of the tracer is fitted with the diffusion time to obtain a curve, and the turbulent diffusion efficiency is obtained.

[0029] It can be understood that the circulation assembly 300 is isolated from the water tank 200 by the switching valve after the system exhaust is completed, forming an independent and constant-volume circulation system, so that the flow field can continuously run in a closed environment until a completely stable state is reached, avoiding the disturbance of external factors such as the change of the water level in the water tank 200; and the subsequent injected tracer can be effectively prevented from being diluted by a large amount of water in the water tank 200, thereby ensuring that the tracer has sufficient concentration and duration in the test circuit to allow the image acquisition device to clearly capture the diffusion process thereof.

[0030] It should be noted that based on the law that "turbulent intensity is positively correlated with material diffusion rate" in fluid mechanics, and in combination with the flow field characteristics of the concentrated water side of the reverse osmosis membrane element, a corresponding relationship between "ink diffusion behavior and turbulent effect" is established, and the judgment basis is as follows: ① Scheme basis: the core function of the concentrated water screen is to destroy the water flow boundary layer and generate vortex (turbulence). The higher the turbulent intensity, the more intense the momentum exchange between fluid molecules, and the faster the mixing rate of ink (tracer) and water flow and the more uniform the spatial distribution. On the contrary, if the screen turbulent effect is poor, the water flow is prone to be in a laminar state, the ink diffusion is dominated by molecular diffusion, the rate is slow, and the range is limited.

[0031] ② Quantitative judgment: the relationship between the ink diffusion area and the time is observed at regular time intervals, and a "diffusion area-time curve" is constructed. The rising slope of the curve (the early diffusion rate) reflects the "dynamic mixing ability" of the turbulence, and the final stable area reflects the "spatial coverage ability" of the turbulence. The combination of the two can objectively quantify the turbulent effect of the screen and avoid the subjectivity of traditional naked eye observation.

[0032] ③ System matching: the turbulent effect of the concentrated water screen is affected by the water inlet flow rate, the degree of membrane compression and the size specification in the actual operation of the reverse osmosis membrane element. In order to objectively reflect the influence of the turbulent effect of the concentrated water screen on the performance of the membrane element, the actual use environment of the concentrated water screen needs to be simulated, so that the turbulent effect of the screen can be reproduced by the test system, and the test result is consistent with the actual working scene of the membrane element.

[0033] According to some embodiments of the present application, the test unit 100 comprises a housing 141 and a transparent cover plate 142, the transparent cover plate 142 constitutes a transparent window, the housing 141 has an inner cavity and is open upward, the transparent cover plate 142 is used to block the opening of the housing 141, the water inlet end of the housing 141 is connected with the water inlet pipe 110, and the water outlet end of the housing 141 is connected with the water outlet pipe 120. The image acquisition device adopts, for example, an industrial camera or a high-definition camera, and records the dynamic process of tracer diffusion through the transparent cover plate 142. The material of the transparent cover plate 142 is preferably a material with high light transmittance, high hardness and good chemical resistance, such as acrylic (PMMA) or tempered glass, which provides an undistorted observation window for the image acquisition device. The rigidity of the transparent cover plate 142 can also exert a certain compression force on the concentrated water screen, simulating the compression state of the membrane on the screen in the actual roll-type membrane element, and ensuring the authenticity of the test conditions.

[0034] According to some embodiments of the present application, referring to Figure 2 , the water inlet end of the housing 141 is provided with a mixing stabilizer 143, the water outlet end of the water inlet pipe 110 is connected with the mixing stabilizer 143, and the liquid outlet end of the injection unit 400 is connected with the mixing stabilizer 143. The inner cavity of the mixing stabilizer 143 usually contains a honeycomb or perforated plate structure, which is used to eliminate the vortex and uneven flow velocity caused by the upstream pipe and elbow, and form a uniform, approximately laminar inlet velocity profile. It is ensured that any diffusion and mixing pattern observed in the test unit 100 subsequently is determined to be caused by the test screen, rather than interference from the upstream or injection process, greatly improving the anti-interference ability and accuracy of the test.

[0035] According to some embodiments of the present application, referring to Figure 1 , the concentrated water screen inspection device further comprises a first pipe 210 and a first valve 211, the water outlet end of the water tank 200 is connected with the water inlet end of the first pipe 210, the water outlet end of the first pipe 210 is connected with the water inlet end of the water inlet pipe 110, and the first valve 211 is arranged in the first pipe 210. The concentrated water screen inspection device further comprises a second pipe 220 and a second valve 221, the water inlet end of the water tank 200 is connected with the water outlet end of the second pipe 220, the water inlet end of the second pipe 220 is connected with the water outlet end of the water outlet pipe 120, and the second valve 221 is arranged in the second pipe 220. The water inlet and outlet of the water tank 200 are directly communicated with the first pipe 210 and the second pipe 220, respectively, and the water flow in the water tank 200 is controlled by controlling the opening or closing of the first valve 211 and the second valve 221.

[0036] It can be understood that when the concentrated water screen needs to be tested, the to-be-tested concentrated water screen is placed in the test unit 100, the circulating valve 311 is closed, the first valve 211 and the second valve 221 are opened, the water pump 130 is started, the water in the water tank 200 enters the water inlet pipe 110, and the water circulates between the water inlet pipe 110, the test unit 100, the water outlet pipe 120 and the water tank 200 for a certain period of time, so as to remove the gas in the pipe. Then, the first valve 211 and the second valve 221 are closed again, the circulating valve 311 is opened, so that the water flows stably, and the water in the water tank 200 is prevented from diluting the subsequent tracer, and then the injection unit 400 is controlled to inject the tracer into the test unit 100.

[0037] Preferably, referring to Figure 1 , the water inlet pipe 110 is provided with a flow rate control unit 150 located between the water pump 130 and the water inlet end of the test unit 100. The flow rate control unit 150 can be a precision regulating valve, a mass flow controller or a pump control system linked with a frequency converter. Through the flow rate control unit 150, the user can accurately set and maintain the flow rate through the screen, so that the test conditions can be flexibly matched with various actual applications, thereby evaluating the performance of the screen under specific working conditions.

[0038] Preferably, referring to Figure 1 , the concentrated water screen testing device further comprises a third pipeline 410 and a third valve 411. The liquid outlet end of the injection unit 400 is connected with the water inlet end of the third pipeline 410, the water outlet end of the third pipeline 410 is connected with the water inlet end of the test unit 100, and the third valve 411 is arranged in the third pipeline 410. When the tracer needs to be injected, the third valve 411 is opened, and the tracer in the injection unit 400 enters the test unit 100 through the third pipeline 410.

[0039] According to some embodiments of the present application, the water pump 130 is a constant flow pump. The image acquisition device is located above the housing 141 and photographs downward. The constant flow pump can maintain constant outlet flow when the system resistance (for example, the change of water viscosity caused by the difference of the screen or the change of temperature) changes slightly, which directly ensures the stability of the flow rate as the core variable. The vertical shooting layout directly above the image acquisition device can minimize the geometric distortion caused by the perspective effect, so that the pixel area in the image can be simply and accurately linearly corresponding to the actual physical area, simplifying the calibration and calculation process of the image analysis software and improving the accuracy of the area measurement.

[0040] The test method of the embodiment comprises the following steps: S100: placing the to-be-tested concentrated water screen in the test unit 100; S200: Close the circulating valve 311, open the water inlet and outlet of the water tank 200, start the water pump 130, and make the water circulate between the water inlet pipe 110, the test unit 100, the water outlet pipe 120 and the water tank 200 for a certain time; S300: Open the circulating valve 311, close the water inlet and outlet of the water tank 200, start the water pump 130, and make the water circulate between the circulating pipe 310, the water inlet pipe 110, the test unit 100 and the water outlet pipe 120 for a certain time; S400: Control the injection unit 400 to inject the tracer into the test unit 100, start the image acquisition device, and take pictures of the diffusion of the tracer in the test unit 100 every certain time. S500: Fit the diffusion area of the tracer with the diffusion time into a curve to obtain the turbulent diffusion efficiency.

[0041] In one embodiment: 1. Preparation stage: ①Cut the thick water screen into a size of 500mm*200mm. The thick water screen can be made of PP or PET, with a thickness of 0.2-0.7mm, a grid angle of 50-95°, and an SPI wire number of 15-35. Clean the screen with pure water and dry it for use. Refer to Figure 3 , respectively, use thick water screens with a thickness of 0.2mm and an SPI wire number of 32, thick water screens with a thickness of 0.43mm and an SPI wire number of 25, and thick water screens with a thickness of 0.7mm and an SPI wire number of 16 for testing.

[0042] ②Test unit 100 structure installation: Place the cleaned thick water screen flat in the shell 141, avoiding wrinkles and deviation, align the edges of the screen with the inner wall edges of the shell 141, and control the error to be ≤1mm. Cover the transparent cover plate 142 on the shell 141 to seal the upper opening of the shell 141, and the transparent cover plate 142 is preferably an acrylic plate to ensure airtightness.

[0043] 2. Exhaust stage: ①Open the first valve 211 and the second valve 221, and keep the circulating valve 311 and the third valve 411 closed.

[0044] ②Start the water pump 130, which is a constant flow pump. Control the flow rate to be 1.5-2L / min through the flow rate control unit 150, and run continuously for about 10min.

[0045] ③Observe the water inlet of the water tank 200. When there is no flow interruption and no bubbles, and there are no visible bubbles in the test unit 100, it is determined that the air in the test system has been exhausted.

[0046] 3. Full circulation test stage: ① Open the circulation valve 311, close the first valve 211 and the second valve 221, control the flow rate control unit 150 to the required water flow rate of the simulation test, run for 15 min, and make the flow field reach a steady state. Observe the front mixing stabilizer 143 at the inlet of the test unit 100. If there is no vortex in the water flow and the flow rate is uniform, it is judged that the flow process has stabilized.

[0047] ② Open the third valve 411, and inject the ink into the mixing stabilizer 143 by the injection unit 400. A micro-injection pump is required, and pure water is configured as 0.5% rhodamine-B test color ink. The injection amount can be adjusted to 0.5-1ml / time, and the injection speed is 0.2ml / s. Slow injection is required to prevent disturbing the flow field. ③ After the ink is injected, keep the water circulating flow running for 5 min, then use the image acquisition device, i.e. the camera, to take a photo of the ink dispersion effect through the transparent cover plate 142. The photo interval is 5-10s, and then the image analysis software is used to calculate the ink area in the photo to obtain the ink dispersion area data. Then take the shooting time as the X axis and the ink dispersion area as the Y axis to draw a scatter plot and fit a curve to analyze the turbulent diffusion efficiency of the concentrated water screen. The test is determined to be good in turbulent effect when the ink dispersion area is >70-80% of the total area of the screen within 1 min.

[0048] From Figure 3 It can be seen that among the three different specifications of the concentrated water screen, the turbulent effect of the concentrated water screen with a thickness of 0.2mm and a SPI wire number of 32 is the best.

[0049] The working process of the embodiment includes: First, system preparation. The measured concentrated water screen (material can be PP or PET) is cut according to the standard size (for example, 500mm long*200mm wide) and cleaned, placed flat in the shell 141 of the test unit 100, and the edges are aligned with the inner wall of the shell 141 without wrinkles, and then the transparent cover plate 142 is used to seal the shell 141. The cover plate provides an optical path while simulating the actual compression of the membrane on the screen.

[0050] Next, the exhaust phase is entered. The first valve 211 and the second valve 221 are opened by the control system while the circulation valve 311 and the third valve 411 remain closed. The water pump 130 is started as a constant flow pump, and a low flow rate (e.g. 1.5-2 L / min) is set by the flow rate control unit 150 to make water flow through the water tank 200, the first pipe 210, the water inlet pipe 110, the test unit 100, the water outlet pipe 120, the second pipe 220, and finally return to the water tank 200, forming an open loop. This process lasts about 10 minutes, and the liquid level of the water tank 200 is used to completely exhaust the air in the pipeline system until no bubbles are observed in the return pipeline, ensuring the purity of the test medium.

[0051] Then, the flow field stabilization phase is switched to. The control system closes the first valve 211 and the second valve 221 while opening the circulation valve 311, switching the flow path to a closed loop consisting of the circulation pipe 310, the water inlet pipe 110, the test unit 100, and the water outlet pipe 120. The flow rate is precisely adjusted to the target simulation working condition value by the flow rate control unit 150, and the system is allowed to run stably in this state for about 15 minutes. This is done to eliminate the transient effects caused by valve switching, to make the flow field in the test unit 100 reach a complete steady state, and to avoid dilution of the tracer injected subsequently by the water tank 200.

[0052] Subsequently, the data acquisition phase is performed. After the flow field is stabilized, the control system opens the third valve 411 to drive the micro-injection pump connected to the injection unit 400 to inject a precisely metered amount of tracer (e.g. 0.5% Rhodamine-B solution) into the flow stabilizer located at the inlet of the test unit 100 at a very slow rate (e.g. 0.2 ml / s) through the third pipe 410. After the tracer is injected, the image acquisition device located above the test unit 100 is immediately started to continuously take pictures of the tracer diffusion in the test unit 100 at fixed time intervals (e.g. every 5-10 seconds) for several minutes.

[0053] Finally, the data analysis and evaluation stage is entered. The series of images collected are imported into image analysis software, which automatically identifies the area covered by the tracer in each image and calculates its area. With the shooting time as the horizontal coordinate and the corresponding diffusion area as the vertical coordinate, a "diffusion area-time" scatter plot is drawn, and mathematical fitting is performed on it to obtain a smooth curve. By analyzing the initial slope of the curve (representing the dynamic mixing ability) and the final platform area (representing the spatial coverage ability), the comprehensive "turbulent diffusion efficiency" is calculated. Finally, this efficiency value is compared with the preset quality standard (for example, whether the diffusion area exceeds 70-80% of the total area within 1 minute), so as to make an objective judgment on the quality of the concentrated water barrier, "good" or "poor". The whole process works together to realize a fast, accurate, and highly relevant performance characterization of the core function of the concentrated water barrier.

[0054] In the description of the present specification, the description referring to the term "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A concentrated water separator testing device, characterized in that, include: Test unit (100), the test unit (100) is used to contain concentrated water screen, the test unit (100) has a transparent window for viewing the inner cavity, the water inlet end of the test unit (100) is connected to a water inlet pipe (110), the water outlet end of the test unit (100) is connected to a water outlet pipe (120), and a water pump (130) is provided inside the water inlet pipe (110). Water tank (200), the water outlet of the water tank (200) is connected to the water inlet of the water inlet pipe (110), and the water inlet of the water tank (200) is connected to the water outlet of the water outlet pipe (120); The circulation assembly (300) includes a circulation pipe (310) and a circulation valve (311). The outlet end of the circulation pipe (310) is connected to the inlet end of the inlet pipe (110), and the inlet end of the circulation pipe (310) is connected to the outlet end of the outlet pipe (120). The circulation valve (311) is located on the circulation pipe (310). An injection unit (400) is provided, wherein the liquid outlet of the injection unit (400) is connected to the water inlet of the test unit (100), and the injection unit (400) is used to inject tracer into the test unit (100). An image acquisition device is used to capture images of the diffusion of the tracer within the test unit (100) through the transparent window.

2. The concentrated water separator testing device according to claim 1, characterized in that, The test unit (100) includes a housing (141) and a transparent cover plate (142). The transparent cover plate (142) forms the transparent window. The housing (141) has an inner cavity with the opening facing upward. The transparent cover plate (142) is used to block the opening of the housing (141). The water inlet end of the housing (141) is connected to the water inlet pipe (110), and the water outlet end of the housing (141) is connected to the water outlet pipe (120).

3. The concentrated water separator testing device according to claim 2, characterized in that, The housing (141) has a mixing stabilizer (143) at the water inlet end, the water outlet end of the water inlet pipe (110) is connected to the mixing stabilizer (143), and the liquid outlet end of the injection unit (400) is connected to the mixing stabilizer (143).

4. The concentrated water separator testing device according to claim 1, characterized in that, The concentrated water screen inspection device also includes a first pipe (210) and a first valve (211). The outlet of the water tank (200) is connected to the inlet of the first pipe (210), the outlet of the first pipe (210) is connected to the inlet of the inlet pipe (110), and the first valve (211) is located on the first pipe (210).

5. The concentrated water separator testing device according to claim 1, characterized in that, The concentrated water screen inspection device also includes a second pipe (220) and a second valve (221). The inlet end of the water tank (200) is connected to the outlet end of the second pipe (220), the inlet end of the second pipe (220) is connected to the outlet end of the outlet pipe (120), and the second valve (221) is located on the second pipe (220).

6. The concentrated water separator testing device according to claim 1, characterized in that, The inlet pipe (110) is equipped with a flow rate control unit (150), which is located between the water pump (130) and the inlet end of the test unit (100).

7. The concentrated water separator testing device according to claim 1, characterized in that, The concentrated water screen testing device also includes a third pipe (410) and a third valve (411). The liquid outlet of the injection unit (400) is connected to the water inlet of the third pipe (410), the water outlet of the third pipe (410) is connected to the water inlet of the test unit (100), and the third valve (411) is located on the third pipe (410).

8. The concentrated water separator testing device according to claim 1, characterized in that, The water pump (130) is a constant flow pump.

9. The concentrated water separator testing device according to claim 2, characterized in that, The image acquisition device is located above the housing (141) and faces downwards to take pictures.

10. A testing method, employing the concentrated water screen testing device as described in any one of claims 1 to 9, characterized in that, The testing method includes the following steps: S100: Place the concentrated water filter to be tested into the test unit (100); S200: Close the circulation valve (311), open the inlet and outlet of the water tank (200), and turn on the water pump (130) to make the water circulate between the inlet pipe (110), the test unit (100), the outlet pipe (120) and the water tank (200) for a certain period of time; S300: Open the circulation valve (311), close the inlet and outlet of the water tank (200), and turn on the water pump (130) to make the water circulate between the circulation pipe (310), the inlet pipe (110), the test unit (100) and the outlet pipe (120) for a certain period of time. S400: Control the injection unit (400) to inject tracer into the test unit (100), turn on the image acquisition device, and take pictures of the diffusion of tracer in the test unit (100) at regular intervals; S500: The diffusion area of ​​the tracer is fitted to a curve with the diffusion time to obtain the turbulent diffusion efficiency.

Images