Filter material working condition testing device and method

Abstract

The application relates to the technical field of filter material testing, in particular to a filter material applicable working condition testing device and method. The testing device comprises a storage tank and a testing assembly, the testing assembly is connected with the storage tank through a main pipeline, a first valve, a flow sensor and a power pump are arranged on the main pipeline, the testing assembly comprises a plurality of parallel branch pipelines and a clamping assembly arranged on all the branch pipelines, the clamping assembly is used for clamping filter material to be tested, each branch pipeline is communicated with the main pipeline, an injection port, a front reserved port and a rear reserved port are arranged on each branch pipeline, the injection port is used for injecting testing particles with a preset concentration and a preset particle size into the branch pipeline, and the front reserved port and the rear reserved port are both used for connecting a detector for detecting the number or concentration of the testing particles. The scheme can simply judge the applicable working condition of the filter material.

Description

Technical Field

[0001] This invention relates to the technical field of filter media testing, and in particular to a testing device and method for filter media applicable operating conditions. Background Technology

[0002] With social development, the demand for high-efficiency liquid filtration cartridges is gradually increasing. While existing testing methods and devices for cartridge filtration performance are relatively mature, there are few methods specifically designed to test the filtration performance of the core filter media. In actual production, people often infer the liquid filtration efficiency and applicable precision based on experience by testing the air filtration efficiency or pore size of the filter media, but the reliability of the results obtained is weak. Furthermore, with the development of scientific research, many filter media that fail to meet research and development precision targets are discarded. Existing testing methods should not be limited to evaluating filter media under specific operating conditions, but should be further developed to determine the most suitable operating conditions for the filter media. Therefore, designing a simple testing device and method to determine the applicable operating conditions of filter media has become an urgent problem to be solved. Summary of the Invention

[0003] This invention provides a testing device and method for the applicable working conditions of filter media, which can easily determine the applicable working conditions of filter media.

[0004] In a first aspect, embodiments of the present invention provide a testing device for the applicable working conditions of filter media, comprising:

[0005] Storage tanks are used to store test media;

[0006] The test assembly is connected to the storage tank via a main pipeline. The main pipeline is equipped with a first valve, a flow sensor, and a power pump. The first valve is used to regulate the flow rate of the test medium flowing through the main pipeline. The flow sensor is used to detect the flow rate of the test medium flowing through the main pipeline. The power pump is used to pump the test medium from the storage tank to the test assembly.

[0007] The test assembly includes multiple parallel branch pipes and clamping components disposed on all of the branch pipes. The clamping components are used to clamp the filter material to be tested. Each branch pipe is connected to the main pipe. Each branch pipe is provided with an injection port, a pre-reserved port, and a post-reserved port. The test medium flows sequentially through the injection port, the pre-reserved port, the clamping components, and the post-reserved port. The injection port is used to inject test particles of a preset concentration and preset particle size into the branch pipe. The pre-reserved port and the post-reserved port are both used to connect to detectors for detecting the number or concentration of particles.

[0008] By changing the concentration and particle size of the test particles flowing through different branch pipes, the most suitable target concentration and target particle size of the filter material to be tested are determined; and based on the application conditions of the filter material to be tested and the filtration capacity of the filter material to be tested per unit time and per unit area, the target area of ​​the filter material to be tested required for each finished filter element is determined.

[0009] In one possible design, the clamping assembly includes two first clamps for clamping the filter material to be tested, each first clamp having a plurality of first openings, the first openings of the two first clamps corresponding to each other, the first openings being used to receive the test medium delivered from the branch line.

[0010] In one possible design, the clamping assembly further includes two second clamping plates for clamping the two first clamping plates. Each second clamping plate is provided with a plurality of second openings. The first openings of the two second clamping plates correspond to each other. The second openings are connected to the branch pipe. A gasket with a reduced diameter can be installed in the first opening.

[0011] In one possible design, the second opening is configured as a row, and the first opening is configured as at least two rows, wherein the number and spacing of the first opening in each row correspond to the number and spacing of the second opening, respectively.

[0012] In one possible design, a flow stabilizing structure is provided in each second opening of the second clamping plate located on the outlet side of the clamping assembly, the flow stabilizing structure being used to ensure a stable outflow of the test medium from the clamping assembly.

[0013] In one possible design, the current stabilizing structure includes a through-hole structure with a concentric circular or helical cross-section.

[0014] In one possible design, each branch pipe located on the inlet side of the clamping assembly is equipped with a second valve, the opening degree of which includes 0 and 100%.

[0015] In one possible design, both first clamps and both second clamps are made of a transparent material.

[0016] In one possible design, a purifier is also included, which is connected to the storage tank and the test assembly respectively via the main pipeline.

[0017] Secondly, embodiments of the present invention provide a method for testing the applicable operating conditions of filter media, employing the testing apparatus for the applicable operating conditions of filter media as described in any of the above claims, comprising:

[0018] The filter material to be tested is held in place by the clamping assembly;

[0019] The test medium is injected into the storage tank, the flow rate of the test medium flowing through the main pipeline is set, and the power pump is turned on.

[0020] Test particles of the same concentration but different particle sizes are injected into the injection ports of some of the branch pipes to determine the most suitable target particle size for the filter material to be tested.

[0021] Test particles of the target particle size and different concentrations are injected into the injection ports of the remaining branch pipes to determine the most suitable target concentration of the filter material to be tested.

[0022] Based on the application conditions of the filter material to be tested and the filtration capacity of the filter material to be tested per unit time and per unit area, the target area of ​​the filter material to be tested required for each finished filter element is determined.

[0023] This invention provides a testing device and method for determining the applicable operating conditions of filter media. By changing the concentration and particle size of test particles flowing through different branch pipes, the most suitable target concentration and target particle size of the filter media under test are determined. Furthermore, based on the application conditions of the filter media under test and the filtration capacity per unit time and unit area, the target area of ​​the filter media required for each finished filter element is determined. Therefore, the above method can easily determine the applicable operating conditions of filter media, that is, determine the most suitable target concentration and target particle size of the filter media, as well as the target area of ​​the filter media required for each finished filter element. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a test device for the applicable working conditions of filter media provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a test component provided in an embodiment of the present invention;

[0027] Figure 3 This is an exploded view of a clamping assembly provided in an embodiment of the present invention.

[0028] Figure label:

[0029] 10 - Filter media to be tested;

[0030] 1-Storage tank;

[0031] 2-Test components;

[0032] 21-Branch pipe;

[0033] 211 - Injection port;

[0034] 212 - Pre-installed reserved port;

[0035] 213 - Rear-mounted reserved port;

[0036] 214 - Second valve;

[0037] 22-Clamping assembly;

[0038] 221 - First clamping plate;

[0039] 221a - First opening;

[0040] 221b - Gasket;

[0041] 222 - Second clamping plate;

[0042] 222a - Second opening;

[0043] 222b - Current-stabilized structure;

[0044] 3-Main road;

[0045] 31-First valve;

[0046] 32 - Flow sensor;

[0047] 33-Power pump;

[0048] 4-Air purifier. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] Figure 1 This is a schematic diagram of the structure of a test device for the applicable working conditions of filter media provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a test component provided in an embodiment of the present invention. Figure 1 and Figure 2 As shown, this embodiment of the invention provides a testing device for the applicable working conditions of filter media. The testing device includes a storage tank 1 and a testing component 2, wherein:

[0051] Storage tank 1 is used to store the test medium;

[0052] Test component 2 is connected to storage tank 1 via main pipeline 3. The main pipeline 3 is equipped with a first valve 31, a flow sensor 32 and a power pump 33. The first valve 31 is used to regulate the flow rate of the test medium flowing through the main pipeline 3, the flow sensor 32 is used to detect the flow rate of the test medium flowing through the main pipeline 3, and the power pump 33 is used to pump the test medium from storage tank 1 to test component 2.

[0053] The test assembly 2 includes multiple parallel branch pipes 21 and clamping assemblies 22 on all branch pipes 21. The clamping assemblies 22 are used to clamp the filter material 10 to be tested. Each branch pipe 21 is connected to the main pipe 3. Each branch pipe 21 is provided with an injection port 211, a pre-reserved port 212 and a post-reserved port 213. The test medium flows through the injection port 211, the pre-reserved port 212, the clamping assembly 22 and the post-reserved port 213 in sequence. The injection port 211 is used to inject test particles of preset concentration and preset particle size into the branch pipe 21. The pre-reserved port 212 and the post-reserved port 213 are both used to connect to detectors that detect the number of particles or the particle concentration.

[0054] By changing the concentration and particle size of the test particles flowing through different branch pipes 21, the most suitable target concentration and target particle size of the filter material 10 to be tested are determined; and based on the application conditions of the filter material 10 to be tested and the filtration capacity of the filter material 10 to be tested per unit time and per unit area, the target area of ​​the filter material 10 to be tested required for each finished filter element is determined.

[0055] In this embodiment, by changing the concentration and particle size of the test particles flowing through different branch pipes 21, the most suitable target concentration and target particle size of the filter material 10 to be tested are determined; and based on the application conditions of the filter material 10 to be tested and the filtration capacity of the filter material 10 per unit time and per unit area, the target area of ​​the filter material 10 required for each finished filter element is determined. Therefore, the above scheme can easily determine the applicable conditions of the filter material, that is, determine the most suitable target concentration and target particle size of the filter material and the target area of ​​the filter material required for each finished filter element.

[0056] The operating conditions to be applied may include the flow rate and contaminant concentration of each finished filter element. The filtration capacity is calculated as: particle concentration * flow rate / area of ​​the filter material in contact with the branch pipe (i.e., the opening area of ​​the first opening 221a below).

[0057] In some embodiments, the test medium may be water, such as microfiltered or ultrafiltered water; the test medium may also be other liquid media, which are not specifically limited herein.

[0058] In some embodiments, the testing device may also be equipped with a pressure gauge (not shown in the figure), with its two ends connected to the inlet and outlet sides of each branch pipe 21 that connects to the clamping assembly 22, respectively, to monitor pressure changes during the test. Thus, when the pressure gauge reading exceeds a threshold, the current test needs to be terminated.

[0059] It should be noted that, in this embodiment of the invention, the diameter of each branch pipe 21 is the same. Thus, by using the flow sensor 32 to detect the flow rate of the test medium flowing through the main pipe 3, the flow rate of the test medium flowing through each branch pipe 21 can be determined (i.e., the flow rate of the test medium flowing through the main pipe 3 divided by the number of branch pipes 21 in operation). In other words, in this embodiment, it is assumed that the flow rate of the test medium flowing through each branch pipe 21 is the same.

[0060] In some embodiments, the detector may be a particle counter or an ultraviolet spectrophotometer, wherein the particle counter is used to detect the number of particles and the ultraviolet spectrophotometer is used to detect the particle concentration. In this embodiment of the invention, the specific type of detector is not limited.

[0061] In one embodiment of the present invention, the above-mentioned testing device further includes a purifier 4, which is connected to the storage tank 1 and the testing component 2 respectively via the main pipeline 3.

[0062] In this embodiment, by setting up a purifier 4, the test medium carrying test particles flowing out of the test component 2 can be purified to obtain a pure test medium, thus enabling the test medium to be recycled.

[0063] Please see Figure 3 In one embodiment of the present invention, the clamping assembly 22 includes two first clamping plates 221 for clamping the filter material 10 to be tested. Each first clamping plate 221 is provided with a plurality of first openings 221a. The first openings 221a of the two first clamping plates 221 correspond to each other. The first openings 221a are used to receive the test medium delivered from the branch pipe 21.

[0064] In this embodiment, by providing multiple first openings 221a in each first clamping plate 221, it is beneficial to conduct multiple tests on a filter material 10 to be tested, thereby improving the efficiency of the filter material 10 to be tested and saving testing time.

[0065] Of course, the clamping assembly 22 may not include the two first clamping plates 221 for clamping the filter material 10 to be tested (i.e., it may not be a separate assembly structure). For example, the clamping assembly 22 may be set as an integral structure, and the filter material 10 to be tested is placed in the integral structure to complete the clamping and fixing of the filter material. In this embodiment of the invention, the specific structure of the clamping assembly 22 is not limited.

[0066] In one embodiment of the present invention, the clamping assembly 22 further includes two second clamping plates 222 for clamping the two first clamping plates 221. Each second clamping plate 222 is provided with a plurality of second openings 222a. The first openings 221a of the two second clamping plates 222 correspond to each other. The second openings 222a are connected to the branch pipe 21. A gasket 221b with a reduced diameter can be installed in the first opening 221a.

[0067] In this embodiment, in order to facilitate changing the opening area of ​​the filter material 10 to be tested, it is necessary to consider adding a second clamping plate 222 outside the first clamping plate 221. In this way, the opening area of ​​the filter material 10 to be tested can be changed by installing a gasket 221b with a smaller diameter inside the first opening 221a. This allows the test area to be adjusted according to the actual size of the filter material, thus improving the applicability of the test.

[0068] In one embodiment of the present invention, the second opening 222a is arranged in one row, and the first opening 221a is arranged in at least two rows, wherein the number and spacing of the first openings 221a in each row correspond to the number and spacing of the second openings 222a. This arrangement allows the filter material 10 to be selectively shifted in the longitudinal, transverse, and diagonal directions during testing, greatly improving the efficiency of the filter material 10 and saving testing time.

[0069] In one embodiment of the present invention, a flow stabilizing structure 222b is provided in each second opening 222a of the second clamping plate 222 located on the outlet side of the clamping assembly 22. The flow stabilizing structure 222b is used to ensure that the test medium in the clamping assembly 22 flows out stably.

[0070] In this embodiment, by providing a flow stabilizing structure 222b in each second opening 222a of the second clamping plate 222 located on the outlet side of the clamping assembly 22, the test medium in the clamping assembly 22 can flow out stably, thereby avoiding downstream data fluctuations and improving the test accuracy.

[0071] In one embodiment of the present invention, the flow stabilizing structure 222b includes a through-hole structure with a concentric circular or helical cross-section. When the flow stabilizing structure 222b is a through-hole structure with a concentric circular cross-section, different annular cylinders are connected by a connecting structure (e.g., connecting ribs).

[0072] In one embodiment of the present invention, each branch pipe 21 located on the inlet side of the clamping assembly 22 is provided with a second valve 214, the opening degree of the second valve 214 including 0 and 100%.

[0073] In this embodiment, by providing a second valve 214 on each branch pipe 21 located on the inlet side of the clamping assembly 22, the second valve 214 and the power pump 33 can be closed after each test is completed. The second valve 214 and the power pump 33 can then be opened after the first clamping plate 221 is moved. That is, the opening degree of the second valve 214 includes 0% and 100%. In other words, the second valve 214 has only two states: fully closed and fully open; while the first valve 31 can be adjusted between 0% and 100%.

[0074] In one embodiment of the present invention, both first clamping plates 221 and both second clamping plates 222 are made of transparent material. This arrangement allows for easy removal of the clamping assembly 22 from the testing device after testing, enabling observation of the filter material's filtration performance using an electron microscope or the naked eye.

[0075] Furthermore, embodiments of the present invention also provide a test method for the applicable working conditions of filter media, employing the test apparatus for the applicable working conditions of filter media mentioned in any of the above embodiments. The test method includes:

[0076] The filter material 10 to be tested is held by clamping assembly 22;

[0077] Inject the test medium into the storage tank 1, set the flow rate of the test medium flowing through the main pipeline 3, and turn on the power pump 33;

[0078] Test particles of the same concentration but different particle sizes are injected into the injection port 211 of a portion of the branch pipe 21 to determine the most suitable target particle size for the filter material 10 to be tested.

[0079] Test particles of the target particle size and different concentrations are injected into the injection port 211 of the remaining branch pipe 21 to determine the most suitable target concentration of the filter material 10 to be tested.

[0080] Based on the application conditions of the filter material 10 to be tested and the filtration capacity of the filter material 10 per unit time and per unit area, the target area of ​​the filter material 10 to be tested required for each finished filter element is determined.

[0081] It is understood that the test method for the applicable working conditions of filter media provided in this embodiment and the test device for the applicable working conditions of filter media provided in the above embodiments are based on the same inventive concept, and therefore have the same beneficial effects. The beneficial effects of the test method for the applicable working conditions of filter media will not be elaborated here.

[0082] The following two examples illustrate the specific process of testing methods for filter media under applicable working conditions.

[0083] Example 1

[0084] (1) Adjust the opening area of ​​the first opening 221a to 10 cm² according to the size of the filter material 10 to be tested.2 After adjustment, the filter material 10 to be tested is clamped and pressed by two first clamping plates 221 and two second clamping plates 222, and the clamping assembly 22 that has completed the clamping work is connected to the testing device.

[0085] (2) Inject the microfiltration water into storage tank 1, set the flow rate to 30L / h, and turn on power pump 33;

[0086] (3) Test particles with a concentration of 10 mg / L and particle sizes of 0.1 μm, 0.5 μm and 1 μm are injected into the injection ports 211 of the three branch pipelines 21 through a particle injection pump. The particle counter is connected to the pre-reserved port 212 and the post-reserved port 213 respectively to record the number of upstream particles and the number of downstream particles (see Table 1). After the data stabilizes, the power pump 33 is turned off. It can be calculated that the highest filtration accuracy of the filter material 10 to be tested is 1 μm (i.e. the target particle size).

[0087] Table 1

[0088]

[0089]

[0090] Note: According to EN 13443-2, when the filtration efficiency of a filter material for a certain particle reaches 99.8% or more, it can be claimed to have the filtration accuracy for particles of that size.

[0091] (4) Adjust other untested areas of the filter material 10 to be tested and conduct the test;

[0092] (5) Inject 1μm test particles into the injection ports 211 of the three branch lines 21 at concentrations of 1mg / L, 5mg / L and 10mg / L respectively through the particle injection pump. Monitor the number of downstream particles and the filtration pressure difference. Record the time when the filtration pressure difference of the three branch lines 21 reaches 100kPa successively (see Table 2, this pressure difference can be set independently according to the tester's requirements). Then turn off the power pump 33.

[0093] Table 2

[0094] Concentration under investigation / mg / L Time to reach specified differential pressure / min 1 41 5 8 10 2

[0095] Table 2 shows that the time to reach the set pressure difference using the 5 mg / L and 1 mg / L concentration lines generally conforms to the concentration ratio relationship. However, the time for the 10 mg / L line is significantly shorter, leading to rapid clogging of the filter media. In actual operating conditions, this can easily result in a rapid increase in pressure difference and even mechanical damage. Therefore, the optimal working concentration for the filter media is considered to be 5 mg / L. Based on this concentration, flow rate, and the opening area of ​​the first opening 221a, the filtration capacity per unit area of ​​filter media per unit time is calculated as 5 mg / L * 30 L / h / 10 cm.2 =15mg / cm 2 ·h.

[0096] Assuming the filter media is used at a rate of 6000 L / h and the contaminant concentration is approximately 1 mg / L, it can be deduced that the target area of ​​the filter media required for each finished filter element is at least 6000 L / h * 1 mg / L / 15 mg / cm². 2 h = 400cm 2 .

[0097] Example 2

[0098] (1) Adjust the opening area of ​​the first opening 221a to 60 cm² according to the size of the filter material 10 to be tested. 2 After adjustment, the filter material 10 to be tested is clamped and pressed by two first clamping plates 221 and two second clamping plates 222, and the clamping assembly 22 that has completed the clamping work is connected to the testing device.

[0099] (2) Inject ultrafiltration water into storage tank 1, set the flow rate to 60L / h, set the storage tank temperature to 70℃, and turn on power pump 33;

[0100] (3) Test particles with a concentration of 10 mg / L and particle sizes of 0.5 μm, 1 μm, 5 μm and 10 μm are injected into the injection ports 211 of the three branch lines 21 through a syringe. The ultraviolet spectrophotometer is connected to the pre-reserved port 212 and the post-reserved port 213 respectively to record the upstream particle concentration and the downstream particle concentration (see Table 3). After the data stabilizes, the power pump 33 is turned off. It can be calculated that the highest filtration accuracy of the filter material 10 to be tested is 10 μm (i.e. the target particle size).

[0101] Table 3

[0102]

[0103]

[0104] (4) Adjust other untested areas of the filter material 10 to be tested and conduct the test;

[0105] (5) Inject 10μm test particles into the injection ports 211 of the three branch lines 21 at concentrations of 1mg / L, 2mg / L, 5mg / L and 10mg / L respectively through a particle injector. Monitor the downstream turbidity and filtration pressure difference, and record the time when the filtration pressure difference of the three branch lines 21 reaches 300kPa successively (see Table 4, this pressure difference can be set independently according to the tester's requirements). Then turn off the power pump 33.

[0106] Table 4

[0107] Concentration under investigation / mg / L Time to reach specified differential pressure / min 1 27 2 14 5 3 10 1

[0108] As shown in Table 4, the optimal working concentration of the filter media is 2 mg / L. Based on the particle concentration, flow rate, and opening area of ​​the first opening 221a, the filtration capacity per unit area of ​​filter media per unit time is calculated to be 2 mg / L * 60 L / h / 60 cm². 2 =2mg / cm 2 ·h.

[0109] Assuming the filter media is used at a flow rate of 12000 L / h and the contaminant concentration is approximately 5 mg / L, we can deduce that the target area of ​​the filter media required for each finished filter element is at least the application area that achieves the optimal filtration capacity of the filter element, and the flow rate is 12000 L / h * 5 mg / L / 2 mg / cm². 2 ·h=3m 2 .

[0110] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A testing device for the applicable working conditions of filter media, characterized in that, include: Storage tanks are used to store test media; The test assembly is connected to the storage tank via a main pipeline. The main pipeline is equipped with a first valve, a flow sensor, and a power pump. The first valve is used to regulate the flow rate of the test medium flowing through the main pipeline. The flow sensor is used to detect the flow rate of the test medium flowing through the main pipeline. The power pump is used to pump the test medium from the storage tank to the test assembly. The test assembly includes multiple parallel branch pipes and clamping components disposed on all of the branch pipes. The clamping components are used to clamp the filter material to be tested. Each branch pipe is connected to the main pipe. Each branch pipe is provided with an injection port, a pre-reserved port, and a post-reserved port. The test medium flows sequentially through the injection port, the pre-reserved port, the clamping components, and the post-reserved port. The injection port is used to inject test particles of a preset concentration and preset particle size into the branch pipe. The pre-reserved port and the post-reserved port are both used to connect to detectors for detecting the number or concentration of particles. By changing the concentration and particle size of the test particles flowing through different branch pipes, the most suitable target concentration and target particle size of the filter material to be tested are determined. And based on the application conditions of the filter material to be tested and the filtration capacity of the filter material to be tested per unit time and per unit area, determine the target area of ​​the filter material to be tested required for each finished filter element; The clamping assembly includes two first clamping plates for clamping the filter material to be tested. Each first clamping plate is provided with multiple first openings. The first openings of the two first clamping plates correspond to each other. The first openings are used to receive the test medium delivered from the branch pipeline. The clamping assembly further includes two second clamping plates for clamping the two first clamping plates. Each second clamping plate is provided with multiple second openings. The first openings of the two second clamping plates correspond to each other. The second openings are connected to the branch pipe. A gasket with a reduced diameter can be installed in the first opening. Each second opening of the second clamping plate located on the outlet side of the clamping assembly is provided with a flow stabilizing structure, which is used to ensure the stable outflow of the test medium in the clamping assembly. The current stabilizing structure includes a through-hole structure with a concentric circular or spiral cross-section.

2. The testing device for the applicable working conditions of filter media according to claim 1, characterized in that, The second opening is configured as a row, and the first opening is configured as at least two rows, wherein the number and spacing of the first opening in each row correspond to the number and spacing of the second opening, respectively.

3. The testing device for the applicable working conditions of filter media according to claim 1, characterized in that, Each branch pipe located on the inlet side of the clamping assembly is equipped with a second valve, the opening degree of which includes 0 and 100%.

4. The testing device for the applicable working conditions of filter media according to claim 1, characterized in that, Both of the first clamps and both of the second clamps are made of transparent material.

5. The testing apparatus for the applicable working conditions of filter media according to any one of claims 1-4, characterized in that, It also includes a purifier, which is connected to the storage tank and the test assembly respectively via the main pipeline.

6. A test method for the applicable working conditions of filter media, characterized in that, The testing apparatus for the applicable working conditions of filter media as described in any one of claims 1-5 includes: The filter material to be tested is held in place by the clamping assembly; The test medium is injected into the storage tank, the flow rate of the test medium flowing through the main pipeline is set, and the power pump is turned on. Test particles of the same concentration but different particle sizes are injected into the injection ports of some of the branch pipes to determine the most suitable target particle size for the filter material to be tested. Test particles of the target particle size and different concentrations are injected into the injection ports of the remaining branch pipes to determine the most suitable target concentration of the filter material to be tested. Based on the application conditions of the filter material to be tested and the filtration capacity of the filter material to be tested per unit time and per unit area, the target area of ​​the filter material to be tested required for each finished filter element is determined.

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