Pre-filter detection tool

Abstract

The utility model discloses a pre-filter detection tool which comprises a first water storage device, a heater, a first test tube, a first booster pump, a first manual valve, a first stop valve, a pre-filter to be detected, a differential pressure gauge, a second test tube, a flow meter, a second water storage device, a third test tube and a second stop valve. A heater is arranged in the first water storage device; the first water storage device, the first test tube, the pre-filter to be tested, the second test tube and the second water storage device are connected in sequence; the first booster pump, the first manual valve and the first stop valve are sequentially arranged on the first test tube from upstream to downstream; the flow meter is arranged on the second test tube; the differential pressure gauge is connected to pipelines at two ends of the pre-filter to be tested; the third test tube is connected in parallel with the test tube between the first manual valve and the flow meter; and the second stop valve is arranged on the third test tube. The tool can be used for completing detection of all items such as purified water flow, pressure drop and rejection rate of the pre-filter, and is simple in structure and easy to control.

Description

Technical Field

[0001] This utility model relates to a pre-filter testing fixture, belonging to the field of pre-filter testing technology. Background Technology

[0002] A pre-filter is the first coarse filtration device for whole-house water purification. It's typically installed on the water pipe after the water meter and filters out large particles such as sediment, rust, insect eggs, and red worms from tap water. This prevents these impurities from entering other water purification devices or water points, thus protecting household water safety and extending the lifespan of subsequent equipment. Pre-filters generally have a "T" shaped structure. The top horizontal section has inlet and outlet ports on either side, while the bottom vertical section houses the main body and internal cylindrical filter screen. The bottom is the drain outlet, controlled by a valve. The filtration accuracy of pre-filters varies from 5 to 300 microns depending on the brand and model.

[0003] According to the existing industry standard QB / T 4695-2014 "Household and Similar Purpose Pre-filters", under the rated operating flow rate, the purified water flow rate should not be lower than the nominal value, the operating pressure drop of a brand-new pre-filter should not exceed 50 kPa, and the rejection rate should not be lower than 90%. Therefore, this utility model provides a pre-filter testing fixture that can assist in testing various aspects of a pre-filter, such as purified water flow rate, pressure drop, and rejection rate. Utility Model Content

[0004] This utility model provides a pre-filter testing fixture for testing various items such as pre-filter water flow rate, pressure drop, and rejection rate. It has a simple structure and is easy to control.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A pre-filter testing fixture includes a first water reservoir, a heater, a first test tube, a first booster pump, a first manual valve, a first shut-off valve, a pre-filter to be tested, a differential pressure gauge, a second test tube, a flow meter, a second water reservoir, a third test tube, and a second shut-off valve.

[0007] The first water reservoir is equipped with a heater; the first water reservoir has an inlet at the top and an outlet at the bottom; the second water reservoir has an inlet at the top;

[0008] One end of the first test tube is connected to the outlet of the first water reservoir and the other end is connected to the inlet of the pre-filter to be tested. One end of the second test tube is connected to the outlet of the pre-filter to be tested and the other end is connected to the inlet of the second water reservoir.

[0009] The first booster pump, the first manual valve, and the first shut-off valve are sequentially installed on the first test tube from upstream to downstream; the flow meter is installed on the second test tube.

[0010] The high-pressure end of the differential pressure gauge is connected to the first test tube between the first shut-off valve and the pre-filter under test, and the low-pressure end of the differential pressure gauge is connected to the second test tube between the pre-filter under test and the flow meter.

[0011] One end of the third test tube is connected to the first test tube between the first manual valve and the first shut-off valve, and the other end is connected to the second test tube between the low-pressure end of the differential pressure gauge and the flow meter; the second shut-off valve is located on the third test tube.

[0012] The direction from upstream to downstream in this application is consistent with the direction of water flow.

[0013] During operation, when testing the flow rate, fill the first water tank with tap water, heat the water to 25°C using a heater, close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the first manual valve to bring the inlet pressure of the pre-filter to the working pressure of the pre-filter under test. Water then enters the second water tank, and the flow rate of the purified water from the pre-filter is measured using a flow meter. The pressure drop value is obtained by reading the differential pressure gauge readings at the inlet and outlet of the pre-filter during the test flow rate operation.

[0014] When testing the rejection rate, the water in the first and second water tanks needs to be drained first. Then test according to the following steps: 1) Fill the first water tank with pure water, heat the water to 25°C using a heater, select the standard particles according to the claimed rejection particle size of the pre-filter, weigh the standard particles and put them into the first water tank, stir evenly to make the standard particle solution fully mixed, and obtain the spiked water. 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged directly into the second water tank without passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and collect the particulate matter in the spiking water in the second water tank through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m1; 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged into the second water tank after being filtered by the pre-filter. When the spiking solution in the second water tank reaches the specified volume (the same as the volume in step 2), close the first booster pump and collect the particulate matter in the spiking water in the second water tank through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m2. Then the retention rate = (m1-m2) / m1.

[0015] To conserve water and simplify operation, the aforementioned pre-filter testing fixture also includes a three-way valve and a fourth test tube. The flow meter and the three-way valve are sequentially installed on the second test tube from upstream to downstream. One end of the fourth test tube is connected to the three-way valve, and the other end leads into the top of the first water storage tank. Thus, when testing the flow rate, the first water storage tank is filled with tap water, and the water temperature is raised to 25°C using a heater. The second shut-off valve is closed, the first shut-off valve is opened, the first booster pump is started, and the first manual valve is adjusted to bring the pressure at the pre-filter inlet to the working pressure of the pre-filter under test. The three-way valve is then adjusted to allow the water from the pre-filter under test to flow back into the first water storage tank, and the flow rate of the purified water from the pre-filter is measured by the flow meter. In this way, the tap water used for testing is recycled back to the first water storage tank, eliminating the need to add water to the first water storage tank or drain water that entered the second water storage tank during the flow test.

[0016] To further facilitate operation and improve water reuse rate, the aforementioned pre-filter testing fixture also includes a fifth test tube, a second booster pump, a second manual valve, a filter, and a third water reservoir; the second water reservoir has an outlet at its bottom; one end of the fifth test tube is connected to the outlet of the second water reservoir, and the other end extends into the top of the third water reservoir; the second booster pump, the second manual valve, and the filter are sequentially arranged on the fifth test tube from upstream to downstream. The method for testing the retention rate using the aforementioned structure includes the following steps: 1) Fill the first water reservoir with pure water, heat the water to 25°C using a heater, select standard particles according to the claimed retention particle size of the pre-filter, weigh the standard particles and put them into the first water reservoir, turn on the stirrer to fully mix the standard particle solution; at this time, the second water reservoir is empty. 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve to allow the spiking water to be discharged directly into the second water tank without passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and open the second booster pump. Collect particulate matter in the spiking water through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter collected by the filter as m1; 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the three-way valve to allow the spiking water to be discharged into the second water tank after passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume (the same as in step 2), close the first booster pump and open the second booster pump. Collect particulate matter through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter collected by the filter as m2; then the retention rate = (m1-m2) / m1. This is simpler and more convenient, and the water collected in the third water tank can be reused.

[0017] To improve the temperature uniformity within the first water reservoir and facilitate the preparation of the standard solution, a stirring device is installed inside the first water reservoir.

[0018] When switching between flow rate and retention rate tests, because the test water is different, both the first and second water storage tanks need to be emptied. To facilitate the emptying of the first and second water storage tanks, drain ports are provided at the bottom of both tanks, and each drain port is equipped with a drain control valve. To improve testing efficiency, the flow rate and pressure drop of multiple pre-filters in the same batch can be tested first, and then the retention rate can be measured.

[0019] To save energy and enhance operational stability, both the first and second booster pumps are variable frequency booster pumps.

[0020] For ease of control, both the first and second shut-off valves are electrically controlled shut-off valves.

[0021] To improve the uniformity of heating, the heater is arranged along the inner perimeter of the first water reservoir.

[0022] To facilitate quick assembly and disassembly, the inlet and outlet of the pre-filter under test are movably connected to the first test tube and the second test tube, respectively.

[0023] To facilitate accurate control of the volume of the liquid in the second water reservoir, the second water reservoir is made of transparent material and has volume scale values ​​set along the height direction.

[0024] The method for testing the pre-filter's purified water flow rate using the above-mentioned fixture is as follows:

[0025] A normal pre-filter operates at a pressure of around 0.4 MPa, while the pressure of municipal tap water is typically only around 0.24 MPa. Therefore, when testing the flow rate of the pre-filter, the inlet pressure needs to be increased to 0.4 MPa. This requires a booster pump to increase the inlet pressure. During flow testing, the inlet and outlet of the pre-filter are movably connected to the first and second test tubes, respectively. The first water reservoir is filled with tap water, and the water temperature is raised to 25°C using a heater. The second shut-off valve is closed, the first shut-off valve is opened, the first booster pump is started, and the first manual valve is adjusted to bring the inlet pressure of the pre-filter to the operating pressure of the pre-filter under test. The three-way valve is adjusted to allow the water from the pre-filter under test to flow back to the first water reservoir. The flow rate of the purified water from the pre-filter is then measured using a flow meter.

[0026] The method for testing the pressure drop of the pre-filter using the above-mentioned tooling is as follows:

[0027] The pressure drop is measured by reading the differential pressure gauge values ​​at the inlet and outlet of the pre-filter during the water flow test.

[0028] The method for testing the rejection rate of the pre-filter using the above-mentioned tooling includes the following steps:

[0029] 1) Fill the first water tank with pure water and heat the water to 25°C using a heater. Select the standard particles according to the claimed particle size of the pre-filter, weigh the standard particles and put them into the first water tank. Turn on the stirrer to make the standard particle solution fully mixed. At this time, the second water tank is empty.

[0030] 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged directly into the second water tank without passing through the pre-filter. When the second water tank reaches the designated scale line a1, close the first booster pump, open the second booster pump, and use the filter to trap and collect the particulate matter in the spiking water until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m1.

[0031] 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, adjust the three-way valve to allow the spiking water to pass through the pre-filter and be discharged into the second water tank. When the second water tank reaches the designated scale line a1, close the first booster pump, open the second booster pump, and filter out particulate matter until all the water in the second water tank flows out. Record the mass of the particulate matter filtered out by the filter as m2; then the rejection rate = (m1-m2) / m1.

[0032] Any technologies not mentioned in this utility model are based on existing technologies.

[0033] This utility model pre-filter testing fixture can be used to test various items of the pre-filter, such as water flow rate, pressure drop, and rejection rate. Multiple tests can be performed on the same device; it has a simple structure and is easy to control. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the pre-filter detection fixture in Embodiment 1 of the utility model;

[0035] Figure 2 This is a schematic diagram of the pre-filter detection fixture in Embodiment 2 of the utility model;

[0036] Figure 3 This is a schematic diagram of the pre-filter detection fixture in Embodiment 3 of the utility model;

[0037] In the diagram, 1 is the first water storage tank, 2 is the heater, 3 is the first test tube, 4 is the first booster pump, 5 is the first manual valve, 6 is the first shut-off valve, 7 is the pre-filter to be tested, 8 is the differential pressure gauge, 9 is the second test tube, 10 is the flow meter, 11 is the second water storage tank, 12 is the third test tube, 13 is the second shut-off valve, 14 is the three-way valve, 15 is the fourth test tube, 16 is the fifth test tube, 17 is the second booster pump, 18 is the second manual valve, 19 is the filter, 20 is the third water storage tank, and 21 is the stirring device. Detailed Implementation

[0038] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0039] The directional terms used in this application, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” are based on the orientation or positional relationship shown in the accompanying drawings or in the usage state, and are used only for the convenience of describing this application. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0040] Example 1

[0041] like Figure 1 As shown, a pre-filter testing fixture includes a first water reservoir, a heater, a first test tube, a first booster pump, a first manual valve, a first shut-off valve, the pre-filter to be tested, a differential pressure gauge, a second test tube, a flow meter, a second water reservoir, a third test tube, and a second shut-off valve.

[0042] The first water reservoir is equipped with a heater; the first water reservoir has an inlet at the top and an outlet at the bottom; the second water reservoir has an inlet at the top;

[0043] One end of the first test tube is connected to the outlet of the first water reservoir and the other end is connected to the inlet of the pre-filter to be tested. One end of the second test tube is connected to the outlet of the pre-filter to be tested and the other end is connected to the inlet of the second water reservoir.

[0044] The first booster pump, the first manual valve, and the first shut-off valve are sequentially installed on the first test tube from upstream to downstream; the flow meter is installed on the second test tube.

[0045] The high-pressure end of the differential pressure gauge is connected to the first test tube between the first shut-off valve and the pre-filter under test, and the low-pressure end of the differential pressure gauge is connected to the second test tube between the pre-filter under test and the flow meter.

[0046] One end of the third test tube is connected to the first test tube between the first manual valve and the first shut-off valve, and the other end is connected to the second test tube between the low-pressure end of the differential pressure gauge and the flow meter; the second shut-off valve is located on the third test tube.

[0047] During operation, when testing the flow rate, fill the first water tank with tap water, heat the water to 25°C using a heater, close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the first manual valve to bring the pressure at the inlet of the pre-filter to the working pressure of the pre-filter under test. Water then enters the second water tank, and the flow rate of the purified water from the pre-filter is measured using a flow meter. The pressure drop value is obtained by reading the differential pressure gauge readings at the inlet and outlet of the pre-filter during the test flow rate operation.

[0048] When testing the rejection rate, the water in the first and second water tanks needs to be drained first. Then test according to the following steps: 1) Fill the first water tank with pure water, heat the water to 25°C using a heater, select the standard particles according to the claimed rejection particle size of the pre-filter, weigh the standard particles and put them into the first water tank, turn on the stirrer to make the standard particle solution fully mixed, and obtain the spiked water. 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged directly into the second water tank without passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and collect the particulate matter in the spiking water in the second water tank through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m1; 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged into the second water tank after being filtered by the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and collect the particulate matter in the spiking water in the second water tank through the filter until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m2. Then the retention rate = (m1-m2) / m1.

[0049] Example 2

[0050] Based on Example 1, the following improvements were made: Figure 2 As shown, to conserve water and simplify operation, the aforementioned pre-filter testing fixture also includes a three-way valve and a fourth test tube. The flow meter and the three-way valve are sequentially installed on the second test tube from upstream to downstream. One end of the fourth test tube is connected to the three-way valve, and the other end leads into the top of the first water storage tank. Thus, when testing the flow rate, the first water storage tank is filled with tap water, the water temperature is raised to 25°C using a heater, the second shut-off valve is closed, the first shut-off valve is opened, the first booster pump is started, and the first manual valve is adjusted to bring the pressure at the pre-filter inlet to the working pressure of the pre-filter under test. The three-way valve is then adjusted to allow the water from the pre-filter under test to flow back into the first water storage tank, and the flow rate of the pre-filter is measured using the flow meter. In this way, the tap water used for testing is recycled back to the first water storage tank, eliminating the need to add water to the first water storage tank or drain water that entered the second water storage tank during the flow test.

[0051] Example 3

[0052] Based on Example 2, the following improvements were made: Figure 3 As shown, to further facilitate operation and improve water reuse rate, the above-mentioned pre-filter testing fixture also includes a fifth test tube, a second booster pump, a second manual valve, a filter, and a third water storage tank; the second water storage tank has an outlet at the bottom; one end of the fifth test tube is connected to the outlet of the second water storage tank, and the other end leads into the top of the third water storage tank; the second booster pump, the second manual valve, and the filter are sequentially arranged on the fifth test tube from upstream to downstream. The method for testing the retention rate using the aforementioned structure includes the following steps: 1) Fill the first water storage tank with pure water, heat the water to 25°C using a heater, select standard particles according to the claimed retention particle size of the pre-filter, weigh the standard particles and put them into the first water storage tank, turn on the stirrer to fully mix the standard particle solution; at this time, the second water storage tank is empty. 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve to allow the spiking water to flow directly into the second water tank without passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and open the second booster pump. Collect particulate matter in the spiking water through the filter until all the water in the second water tank has flowed out. Record the mass of the particulate matter collected by the filter as m1; 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, and adjust the three-way valve to allow the spiking water to flow into the second water tank after passing through the pre-filter. When the spiking solution in the second water tank reaches the specified volume, close the first booster pump and open the second booster pump. Collect particulate matter through the filter until all the water in the second water tank has flowed out. Record the mass of the particulate matter collected by the filter as m2; then the retention rate = (m1-m2) / m1. This method is simpler and more convenient, and the water collected in the third water tank can be reused.

[0053] Example 4

[0054] Based on Example 3, the following improvements were made: To improve the temperature uniformity within the first water reservoir and facilitate the preparation of the standard solution, a stirring device was installed inside the first water reservoir, and a heater was installed along the periphery of the first water reservoir. When switching between flow rate and retention rate tests, both the first and second water reservoirs need to be emptied. To facilitate this emptying, drain ports are provided at the bottom of both the first and second water reservoirs, and each drain port is equipped with a drain control valve. To improve testing efficiency, the flow rate and pressure drop of multiple pre-filters in the same batch can be tested before measuring the retention rate.

[0055] Example 5

[0056] Based on Example 4, the following improvements were made: To save energy and enhance operational stability, both the first and second booster pumps are variable frequency booster pumps. For ease of control, both the first and second shut-off valves are electrically controlled shut-off valves. For easy and quick assembly and disassembly, the inlet and outlet of the pre-filter under test are movably connected to the first and second test tubes, respectively. To facilitate accurate control of the volume of the test liquid in the second water reservoir, the second water reservoir is made of transparent material, and a volume scale is provided on the second water reservoir along its height.

[0057] The method for testing the pre-filter's purified water flow rate using the above-mentioned fixture is as follows:

[0058] A normal pre-filter operates at a pressure of around 0.4 MPa, while the pressure of municipal tap water is typically only around 0.24 MPa. Therefore, when testing the flow rate of the pre-filter, the inlet pressure needs to be increased to 0.4 MPa. This requires a booster pump to increase the inlet pressure. During flow testing, the inlet and outlet of the pre-filter are movably connected to the first and second test tubes, respectively. The first water reservoir is filled with tap water, and the water temperature is raised to 25°C using a heater. The second shut-off valve is closed, the first shut-off valve is opened, the first booster pump is started, and the first manual valve is adjusted to bring the inlet pressure of the pre-filter to the operating pressure of the pre-filter under test. The three-way valve is adjusted to allow the water from the pre-filter under test to flow back to the first water reservoir. The flow rate of the purified water from the pre-filter is then measured using a flow meter.

[0059] The method for testing the pressure drop of the pre-filter using the above-mentioned tooling is as follows:

[0060] The pressure drop is measured by reading the differential pressure gauge values ​​at the inlet and outlet of the pre-filter during the water flow test.

[0061] The method for testing the rejection rate of the pre-filter using the above-mentioned tooling includes the following steps:

[0062] 1) Fill the first water tank with pure water and heat the water to 25°C using a heater. Select the standard particles according to the claimed particle size of the pre-filter, weigh the standard particles and put them into the first water tank. Turn on the stirrer to make the standard particle solution fully mixed. At this time, the second water tank is empty.

[0063] 2) Close the first shut-off valve, open the second shut-off valve, start the first booster pump, and adjust the three-way valve so that the spiking water is discharged directly into the second water tank without passing through the pre-filter. When the second water tank reaches the designated scale line a1, close the first booster pump, open the second booster pump, and use the filter to trap and collect the particulate matter in the spiking water until all the water in the second water tank flows out. Record the mass of the particulate matter trapped by the filter as m1.

[0064] 3) Close the second shut-off valve, open the first shut-off valve, start the first booster pump, adjust the three-way valve to allow the spiking water to pass through the pre-filter and be discharged into the second water tank. When the second water tank reaches the designated scale line a1, close the first booster pump, open the second booster pump, and filter out particulate matter until all the water in the second water tank flows out. Record the mass of the particulate matter filtered out by the filter as m2; then the rejection rate = (m1-m2) / m1.

[0065] The pre-filter testing fixtures described above can be used to test various parameters of the pre-filter, such as water flow rate, pressure drop, and rejection rate. Multiple tests can be performed on the same device; the structure is simple and easy to control.

Claims

1. A pre-filter testing fixture, characterized in that: It includes a first water storage tank (1), a heater (2), a first test tube (3), a first booster pump (4), a first manual valve (5), a first shut-off valve (6), a pre-filter to be tested (7), a differential pressure gauge (8), a second test tube (9), a flow meter (10), a second water storage tank (11), a third test tube (12), and a second shut-off valve (13); The first water reservoir (1) is equipped with a heater (2); the first water reservoir (1) has an inlet at the top and an outlet at the bottom; the second water reservoir (11) has an inlet at the top; one end of the first test tube (3) is connected to the outlet of the first water reservoir (1) and the other end is connected to the inlet of the pre-filter (7) to be tested; one end of the second test tube (9) is connected to the outlet of the pre-filter (7) to be tested and the other end is connected to the inlet of the second water reservoir (11); The first booster pump (4), the first manual valve (5), and the first shut-off valve (6) are sequentially installed on the first test tube (3) in the direction from upstream to downstream; the flow meter (10) is installed on the second test tube (9); the high-pressure end of the differential pressure gauge (8) is connected to the first test tube (3) between the first shut-off valve (6) and the pre-filter (7) to be tested, and the low-pressure end of the differential pressure gauge (8) is connected to the second test tube (9) between the pre-filter (7) to be tested and the flow meter (10); One end of the third test tube (12) is connected to the first test tube (3) between the first manual valve (5) and the first shut-off valve (6), and the other end is connected to the second test tube (9) between the low-pressure end of the differential pressure gauge (8) and the flow meter (10); the second shut-off valve (13) is located on the third test tube (12).

2. The pre-filter testing fixture according to claim 1, characterized in that: It also includes a three-way valve (14) and a fourth test tube (15). The flow meter (10) and the three-way valve (14) are arranged sequentially on the second test tube (9) in the direction from upstream to downstream. One end of the fourth test tube (15) is connected to the three-way valve (14), and the other end is connected to the top of the first water storage tank (1).

3. The pre-filter testing fixture according to claim 1 or 2, characterized in that: It also includes a fifth test tube (16), a second booster pump (17), a second manual valve (18), a filter (19), and a third water reservoir (20); the second water reservoir (11) has an outlet at the bottom; one end of the fifth test tube (16) is connected to the outlet of the second water reservoir (11), and the other end is connected to the top of the third water reservoir (20); the second booster pump (17), the second manual valve (18), and the filter (19) are arranged sequentially on the fifth test tube (16) from upstream to downstream.

4. The pre-filter testing fixture according to claim 1 or 2, characterized in that: The first water storage tank (1) is equipped with a stirring device (21).

5. The pre-filter testing fixture according to claim 1 or 2, characterized in that: Both the first water reservoir (1) and the second water reservoir (11) are equipped with drain outlets at their bottoms, and each drain outlet is equipped with a drain control valve.

6. The pre-filter testing fixture according to claim 1 or 2, characterized in that: Both the first booster pump (4) and the second booster pump (17) are variable frequency booster pumps.

7. The pre-filter testing fixture according to claim 1 or 2, characterized in that: Both the first shut-off valve (6) and the second shut-off valve (13) are electrically controlled shut-off valves.

8. The pre-filter testing fixture according to claim 1 or 2, characterized in that: The heater (2) is arranged around the inside periphery of the first water reservoir (1).

9. The pre-filter testing fixture according to claim 1 or 2, characterized in that: The inlet and outlet of the pre-filter (7) to be tested are movably connected to the first test tube (3) and the second test tube (9), respectively.

10. The pre-filter testing fixture according to claim 1 or 2, characterized in that: The second water reservoir (11) is made of transparent material and has volume scale values ​​set along the height direction.

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