Test equipment for high-efficiency filter

Abstract

The utility model relates to test equipment for a high-efficiency filter, which comprises a filter unit comprising a shell, a frame, a pre-filter and a fan, an air flow channel is enclosed by the shell, the air flow channel is provided with an opening part, the opening part is provided with a door body capable of being opened and closed, the frame is connected in the air flow channel and is used for being detachably connected with the high-efficiency filter to be tested, and the pre-filter is arranged in the air flow channel. The prefilter is mounted in the airflow channel and used for capturing large particles in air, and the fan is mounted in the airflow channel and used for driving the air to flow; the detection unit comprises a particle counter, the particle counter is arranged outside the shell and communicated with the air outlet side space of the detected efficient filter, and the particle counter is used for detecting particles in the air; the control unit is connected with the filtering unit and the detection unit. According to the utility model, the high-efficiency filter can be tested, and the damage probability of the high-efficiency filter in the testing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of filter testing technology, and in particular to a testing device for high-efficiency filters. Background Technology

[0002] In environments requiring high cleanliness, such as hospital cleanrooms, laboratories, and dust-free workshops, high-efficiency particulate air (HEPA) filters are essential. HEPA filters are primarily used to capture particulate dust and various suspended solids larger than 0.15µm, serving as the final stage of filtration in various systems. The performance of air filters is a crucial component in ensuring environmental hygiene. Traditional filter testing equipment, due to its bulky size, complex operation, and high cost, limits its on-site applicability.

[0003] To address the aforementioned issues, Chinese utility model patent CN113324891A discloses a filter testing device, comprising a first housing, a second housing, and a third housing that are sequentially connected and detachably linked. The first housing houses a fan and a first diffuser plate, the second housing houses an installation assembly, and the third housing houses a recovery assembly and a second diffuser plate. In use, the filter to be tested is installed in the second housing, and then the first, second, and third housings are sequentially connected. Detection particles for the filter are drawn into the filter under the action of the fan, and the filter's efficiency can be measured by observing the filtration of these particles. Remaining detection particles are recovered by the recovery assembly. However, this filter testing device is prone to damaging the filter during testing. Reducing the probability of damage to high-efficiency filters during testing is a pressing technical problem in this field. Utility Model Content

[0004] Therefore, this utility model provides a testing device for high-efficiency filters, which can test high-efficiency filters and reduce the probability of damage to the high-efficiency filters during the testing process.

[0005] To solve the above-mentioned technical problems, this utility model provides a testing device for high-efficiency filters, comprising:

[0006] The filtration unit includes a housing, a frame, a pre-filter, and a fan. The housing encloses an airflow channel for guiding airflow. The airflow channel has an opening for the HEPA filter under test to enter and exit the airflow channel. The opening is equipped with an openable and closable door. The frame is connected within the airflow channel and is used for detachable connection of the HEPA filter under test. The pre-filter is installed in the airflow channel and is used to capture large particles in the air entering the HEPA filter under test. The fan is installed in the airflow channel and is used to drive airflow through the pre-filter and the HEPA filter under test.

[0007] The detection unit includes a particle counter, which is located outside the housing and communicates with the outlet space of the HEPA filter under test. The particle counter is used to detect particles in the air discharged from the HEPA filter under test.

[0008] A control unit, which is connected to the filtering unit and the detection unit.

[0009] Furthermore, the framework includes:

[0010] A positioning frame, which is used to position the HEPA filter under test outside the frame and restrict the HEPA filter under test from moving out to the first side of the frame opening of the positioning frame;

[0011] A clamping frame is detachably connected to the second side of the opening of the positioning frame. The clamping frame is used to restrict the HEPA filter under test from moving out of the second side of the opening of the positioning frame.

[0012] Furthermore, the pre-filter is an F9 filter.

[0013] Furthermore, the housing includes a first housing section, and the pre-filter is disposed within the first housing section to form a pre-filter module.

[0014] Furthermore, the housing includes a second box section, which is a sound-absorbing and sound-insulating box, and the frame and the fan are disposed inside the second box section.

[0015] Furthermore, the fan is positioned between the pre-filter and the frame.

[0016] Furthermore, the fan is a DC brushless fan.

[0017] Furthermore, the detection unit also includes multiple differential pressure sensors, which are located outside the airflow channel and connected to the housing. The multiple differential pressure sensors are used to detect the pressure difference between the inlet and outlet sides of the pre-filter and the pressure difference between the inlet and outlet sides of the HEPA filter under test, respectively.

[0018] Furthermore, the detection unit also includes a flow sensor, a temperature sensor, and a humidity sensor. The flow sensor, the temperature sensor, and the humidity sensor are all located outside the airflow channel and connected to the housing. The flow sensor is used to detect the flow rate of the air entering the airflow channel, the temperature sensor is used to detect the temperature of the air entering the airflow channel, and the humidity sensor is used to detect the humidity of the air entering the airflow channel.

[0019] Furthermore, it also includes a movable support, on which the housing is mounted.

[0020] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The testing equipment for the high-efficiency filter described in this utility model includes a filtration unit, a detection unit and a control unit, which can detect the filtration performance of the high-efficiency filter. The filtration unit includes a pre-filter, which removes large particles in the air before entering the high-efficiency filter, preventing large particles in the air from damaging the high-efficiency filter. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a front view of the testing equipment for the high-efficiency filter in this utility model;

[0023] Figure 2 This is a top view of the testing equipment for the high-efficiency filter in this utility model;

[0024] Figure 3 This is a schematic diagram of the frame in this utility model.

[0025] Figure 4 This is a schematic diagram of the frame assembly in this utility model;

[0026] Figure 5 This is a block diagram illustrating the control principle of the testing equipment for the high-efficiency filter in this utility model.

[0027] Explanation of reference numerals in the accompanying drawings: 1. Filter unit; 11. Housing; 111. Door; 112. First housing section; 113. Second housing section; 12. Frame; 121. Positioning frame; 122. Clamping frame; 123. Gasket; 124. Side clip; 125. Corner clip; 13. Pre-filter; 14. Fan; 15. High-efficiency filter under test;

[0028] 2. Detection unit; 21. Particle counter; 22. Differential pressure sensor; 23. Flow sensor; 24. Temperature sensor; 25. Humidity sensor;

[0029] 3. Control unit. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example 1

[0031] See Figures 1 to 5 The image shows an embodiment of the testing equipment for the high-efficiency filter provided by this utility model.

[0032] Testing equipment for high-efficiency filters includes:

[0033] The filter unit 1 includes a housing 11, a frame 12, a pre-filter 13, and a fan 14. The housing 11 encloses an airflow channel with an opening for the HEPA filter under test to enter and exit the airflow channel. The opening is fitted with an openable and closable door 111. The frame 12 is connected to the airflow channel and is used for detachably connecting the HEPA filter under test 15. The pre-filter 13 is installed in the airflow channel and is used to capture large particles in the air entering the HEPA filter under test 15. The fan 14 is installed in the airflow channel and is used to drive airflow through the pre-filter 13 and the HEPA filter under test 15.

[0034] The detection unit 2 includes a particle counter 21, which is located outside the housing 11 and communicates with the outlet space of the HEPA filter 15 under test. The particle counter 21 is used to detect particles in the air discharged from the HEPA filter 15 under test.

[0035] Control unit 3, which is connected to the filter unit 1 and the detection unit 2.

[0036] After placing the HEPA filter 15 under test into the frame, ensure that it fits tightly without gaps. Simultaneously, prevent contamination or damage to the HEPA filter 15 during installation. Seal the connection between the HEPA filter 15 and the frame to prevent air leakage and ensure filtration effectiveness. Once connected to the frame, the HEPA filter 15 is fixed in position. Air from the inlet side of the HEPA filter 15 can only reach its outlet side through it; there should be no gaps between the HEPA filter 15 and the airflow channel allowing air to pass through.

[0037] After the HEPA filter 15 under test is installed in the airflow channel, the filter unit 1 can perform the filtration function. The fan 14 drives the air to flow along the airflow channel. The air first passes through the pre-filter 13 to remove large dust particles. The air with large dust particles removed then passes through the HEPA filter 15 under test to remove particulate matter. A particle counter detects the particulate matter content in the air after it has been filtered by the HEPA filter 15 under test. If the particulate matter content is within the set range, it indicates that the filtration performance of the HEPA filter 15 under test meets the requirements. If the particulate matter content is greater than the set range, it indicates that the filtration performance of the HEPA filter 15 under test does not meet the requirements.

[0038] The aforementioned testing equipment for high-efficiency filters includes a filter unit 1, a detection unit 2, and a control unit 3, which can test the filtration performance of the high-efficiency filter 15 under test. The filter unit 1 includes a pre-filter 13, which removes large particles from the air before it enters the high-efficiency filter 15 under test, preventing large particles in the air from damaging the high-efficiency filter 15 under test.

[0039] In this embodiment, the frame 12 includes:

[0040] Positioning frame 121 is used to position the HEPA filter 15 under test outside the frame and restrict the HEPA filter 15 under test from moving out to the first side of the frame opening of the positioning frame 121.

[0041] A clamping frame 122 is detachably connected to the positioning frame 121. The clamping frame 122 is used to restrict the tested high-efficiency filter 15 from moving out of the second side of the frame opening of the positioning frame 121.

[0042] Both the positioning frame 121 and the clamping frame 122 are rectangular frames. The four sides of the positioning frame 121 and the four sides of the clamping frame 122 enclose the opening. The HEPA filter 15 under test cannot enter or exit the opening of the positioning frame 121 from the first side. The HEPA filter 15 under test can enter the opening of the positioning frame 121 from the second side. When the clamping frame 122 is connected to the second side of the opening of the positioning frame 121, the HEPA filter 15 under test cannot enter or exit the opening of the positioning frame 121 from the second side.

[0043] When installing the HEPA filter 15 under test, first weld the first side bend of the pad strip 123, which is centered on the left and right and close to the frame opening of the positioning frame 121, to the frame opening of the positioning frame 121. Then, install the HEPA filter 15 under test. After that, install the clamping frame 122 and press the HEPA filter 15 under test. Finally, install the side clip 124 and the corner clip 125, tighten them, and then fix the HEPA filter 15 under test through the clamping frame 122.

[0044] In this embodiment, the pre-filter 13 is an F9 filter.

[0045] The pre-filter 13 is an F9 filter that can filter dust particles of 0.4µm and above, thereby protecting the tested HEPA filter 15.

[0046] In this embodiment, the housing 11 includes a first housing portion 112, and the pre-filter 13 is disposed in the first housing portion 112 to form a pre-filter module.

[0047] The pre-filter 13 and the first housing 112 form a pre-filter module, enabling quick replacement and allowing the maintenance cycle to be adjusted according to the pollution load.

[0048] In this embodiment, the housing 11 includes a second housing portion 113, which is a sound-absorbing and sound-insulating box. The frame (not shown in the figure) and the fan 14 are disposed inside the second housing portion 113. The first housing portion 112 and the second housing portion 113 can be quickly and easily connected.

[0049] Since the fan 14 will generate noise during operation, the second housing 113 is set as a sound-absorbing and sound-insulating box to reduce operating noise.

[0050] In this embodiment, the fan 14 is disposed between the pre-filter 13 and the frame (not shown in the figure).

[0051] The fan 14 is located between the pre-filter 13 and the frame. The pre-filter 13 removes larger particles from the air, reducing damage to the fan 14.

[0052] In this embodiment, the aforementioned fan 14 is a DC brushless fan.

[0053] The DC brushless fan uses DC power input to rotate the DC motor, which in turn drives the fan impeller to rotate. The airflow direction generated by the DC brushless fan is the same as the axis of the fan blade. Fan 14 is a brushless DC brushless fan that can support different levels of airflow control.

[0054] In this embodiment, the detection unit 2 further includes a plurality of differential pressure sensors 22. The differential pressure sensors 22 are located outside the airflow channel and connected to the housing 11. The plurality of differential pressure sensors 22 are used to detect the pressure difference between the inlet and outlet sides of the pre-filter 13 and the pressure difference between the inlet and outlet sides of the tested high-efficiency filter 15, respectively.

[0055] The differential pressure sensor 22 is a sensor used to measure the difference between two pressures. By setting the differential pressure sensor 22, the clogging of the pre-filter 13 and the HEPA filter under test can be detected.

[0056] In this embodiment, the detection unit 2 further includes a flow sensor 23, a temperature sensor 24, and a humidity sensor 25. The flow sensor 23, the temperature sensor 24, and the humidity sensor 25 are all located outside the airflow channel and connected to the housing 11. The flow sensor 23 is used to detect the flow rate of the air entering the airflow channel, the temperature sensor 24 is used to detect the temperature of the air entering the airflow channel, and the humidity sensor 25 is used to detect the humidity of the air entering the airflow channel.

[0057] By setting up flow sensor 23, temperature sensor 24 and humidity sensor 25, the status of filter unit 1 is monitored in real time and data is recorded.

[0058] In this embodiment, a movable bracket (not shown in the figure) is also included, and the housing 11 is mounted on the movable bracket.

[0059] The movable bracket facilitates the movement of the HEPA filter testing equipment for use in different settings. The movable bracket includes a support frame and casters mounted on its base.

[0060] In this embodiment, the tested high-efficiency filter 15 includes an H13 or H14 filter.

[0061] The filtration efficiency of H13 filters is generally 99.95%; the filtration efficiency of H14 filters is generally 99.995%.

[0062] The assembly and preparation process of the above-mentioned HEPA filter test equipment includes the following steps: (1) Install the pre-filter and check its sealing performance; (2) Install the HEPA filter to be tested and ensure its sealing performance; (3) Start and perform preliminary testing, turn on the power, activate the system to gradually increase to the operating speed; (4) The equipment performs self-testing, including module diagnosis of the fan, sensor and sealing performance; (5) Connect the test unit; (6) Calibrate the test unit to ensure the accuracy of the initial data; (7) Perform comprehensive testing; (8) Adjust the fan to achieve the required airflow and start the filtration efficiency and sealing performance test; (9) Real-time data is dynamically displayed on the control panel; (10) Data analysis and result storage, the system automatically analyzes the real-time monitoring data, generates filtration performance and leakage rate reports, and the test results can be output through USB or wireless module, supporting remote monitoring and data sharing; (11) Test end and reset, the equipment is gradually stopped under the safety procedure, the power is turned off, the HEPA filter is removed, and the pre-filter and airflow channel are cleaned.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A testing device for high-efficiency filters, characterized in that, include: The filtration unit includes a housing, a frame, a pre-filter, and a fan. The housing encloses an airflow channel for guiding airflow. The airflow channel has an opening for the HEPA filter under test to enter and exit the airflow channel. The opening is equipped with an openable and closable door. The frame is connected within the airflow channel and is used for detachable connection of the HEPA filter under test. The pre-filter is installed in the airflow channel and is used to capture large particles in the air entering the HEPA filter under test. The fan is installed in the airflow channel and is used to drive airflow through the pre-filter and the HEPA filter under test. The detection unit includes a particle counter, which is located outside the housing and communicates with the outlet space of the HEPA filter under test. The particle counter is used to detect particles in the air discharged from the HEPA filter under test. A control unit, which is connected to the filtering unit and the detection unit.

2. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The framework includes: A positioning frame, which is used to position the HEPA filter under test outside the frame and restrict the HEPA filter under test from moving out to the first side of the frame opening of the positioning frame; A clamping frame is detachably connected to the second side of the opening of the positioning frame. The clamping frame is used to restrict the HEPA filter under test from moving out of the second side of the opening of the positioning frame.

3. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The pre-filter is an F9 filter.

4. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The housing includes a first housing section, and the pre-filter is disposed within the first housing section to form a pre-filter module.

5. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The housing includes a second box section, which is a sound-absorbing and sound-insulating box, and the frame and the fan are disposed inside the second box section.

6. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The fan is located between the pre-filter and the frame.

7. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The fan is a DC brushless fan.

8. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The detection unit also includes multiple differential pressure sensors, which are located outside the airflow channel and connected to the housing. The multiple differential pressure sensors are used to detect the pressure difference between the inlet and outlet sides of the pre-filter and the pressure difference between the inlet and outlet sides of the HEPA filter under test, respectively.

9. The testing equipment for high-efficiency filters according to claim 1, characterized in that, The detection unit further includes a flow sensor, a temperature sensor, and a humidity sensor. The flow sensor, the temperature sensor, and the humidity sensor are all located outside the airflow channel and connected to the housing. The flow sensor is used to detect the flow rate of the air entering the airflow channel, the temperature sensor is used to detect the temperature of the air entering the airflow channel, and the humidity sensor is used to detect the humidity of the air entering the airflow channel.

10. The testing equipment for high-efficiency filters according to claim 1, characterized in that, It also includes a movable bracket, on which the housing is mounted.

Images