Filtering efficiency detection device

Abstract

The utility model discloses a filter efficiency detection device, which relates to the technical field of filter efficiency detection and comprises a mounting plate, the top of the mounting plate is fixedly connected with a base, the top of the base is symmetrically and fixedly connected with supporting columns, the other ends of the supporting columns are fixedly connected with a top plate, the top of the top plate is symmetrically provided with cylinders, and the telescopic ends of the cylinders are fixedly connected with lifting seats. A pressing head is installed at the bottom of the lifting seat, a particle counter is installed at the top of the lifting seat, a mounting seat is movably connected into the base, fixing assemblies are symmetrically installed in the mounting seat, a die groove is formed in the top of the mounting seat, and an aerosol generator is installed at the top of the base. With the adoption of the structure, the detection device can be adapted to masks of various models, and different mounting seats can be connected with the base through the same locking principle through the universal design of the base, so that the compatibility of the detection device to the masks of different models is enhanced, and the equipment cost and the maintenance difficulty are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of filtration efficiency testing technology, and specifically relates to a filtration efficiency testing device. Background Technology

[0002] A filtration efficiency testing device is used to test the filtration performance of various filter materials or filters. It typically consists of an air supply system, a particle generator, a test chamber, detection sensors, and a control system. The air supply system provides a stable airflow, while the particle generator produces aerosol particles of a specific size and concentration. These particles are carried by the airflow into the test chamber, where the filter material or filter to be tested is placed. This device can be widely used for filtration performance testing in air purifiers, masks, air conditioning filters, industrial dust removal equipment, and other fields to ensure that filtration products meet corresponding quality standards and usage requirements, providing crucial technical support for product research and development, production, and quality control.

[0003] Announcement No. "CN215179495U" discloses a mask filtration efficiency testing device, comprising a base, a lower clamping shell fixedly connected to the upper surface of the base, an upper clamping shell above the lower clamping shell, a cavity within the lower clamping shell, a driving mechanism within the cavity, a bearing on the lower surface of the cavity, a threaded rod rotatably connected within the bearing, a threaded through hole on the upper clamping shell, and a boss fixedly connected to the upper surface of the lower clamping shell, and a groove on the lower surface of the upper clamping shell. Through the cooperation of the lower clamping shell, upper clamping shell, driving mechanism, cavity, bearing, threaded rod, threaded through hole, boss, and groove, the mask can be clamped and fixed, resulting in a better sealing effect and avoiding the problems caused by using hot melt adhesive to seal edge gaps.

[0004] The aforementioned utility model can clamp and fix masks with better sealing, avoiding the problems caused by sealing edge gaps with hot melt adhesive. However, different types and sizes of masks have different shapes and structural characteristics. Since the shape of the protrusions on the clamping shell is fixed, it can only be applied to one or a few specific mask models. It cannot be well adapted to masks of other shapes or sizes, resulting in inaccurate testing of their filtration efficiency. Moreover, the fixed protrusion shape cannot be adjusted according to the material and structural characteristics of the mask. When clamping the mask, uneven pressure is applied, causing the mask to deform. The deformation of the mask changes its internal filtration structure and pore distribution, thus affecting its actual filtration performance. Utility Model Content

[0005] In response to the problems mentioned in the background art, the purpose of this utility model is to provide a filtration efficiency testing device to solve the problem that different types and sizes of masks have different shapes and structural characteristics. Since the shape of the boss on the clamping shell is fixed, it can only be applied to one or a few specific models of masks. It cannot be well adapted to masks of other shapes or sizes, resulting in the inability to accurately test their filtration efficiency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A filtration efficiency testing device includes a mounting plate, a base fixedly connected to the top of the mounting plate, support columns symmetrically fixedly connected to the top of the base, a buffer assembly installed on the outside of the support columns, a top plate fixedly connected to the other end of the support columns, cylinders symmetrically installed on the top of the top plate, a lifting seat fixedly connected to the telescopic end of the cylinders, a fixing plate threadedly connected to the bottom of the lifting seat, a pressure head fixedly connected to the bottom of the fixing plate, a particle counter installed on the top of the lifting seat, a mounting base movably connected inside the base, fixing components symmetrically installed inside the mounting base, a mold groove opened on the top of the mounting base, and an aerosol generator installed on the top of the base.

[0008] The fixing assembly includes a cavity, a return spring, a moving plate, and a locking block. The mounting base has symmetrically shaped cavities. A return spring is fixedly connected to one side of each cavity, and a moving plate is fixedly connected to the other end of the return spring. The moving plate is slidably connected to the cavity. A locking block is fixedly connected to the side of the moving plate away from the return spring, extending outwards from the mounting base. The bottom of the locking block has a slope. The top of the base has a mounting groove that plugs into the mounting base. Locking grooves are formed on both sides of the mounting groove, and the locking block engages with the locking groove. The top of the base has symmetrically shaped push grooves that communicate with the locking grooves. An unlocking block is slidably connected inside the locking groove. A slider is fixedly connected to both sides of the unlocking block. Sliding grooves are formed on both sides of the locking groove, and the sliders are slidably connected to the sliding grooves. This design allows for compatibility with various mask models. Furthermore, the universal design of the base enables different mounting bases to connect to the base using the same locking principle, enhancing the compatibility of the testing device with different mask models and reducing equipment costs and maintenance difficulty.

[0009] As a preferred technical solution, an air inlet channel is provided at the bottom of the mounting slot, which is connected to the mold groove inside the mounting base. An air pump is installed on the top of the mounting plate, with the air inlet end of the air pump connected to an aerosol generator. The air outlet end of the air pump is fixedly connected to a connecting pipe, the other end of which is connected to the air inlet channel inside the base. This ensures that aerosols are stably delivered from the aerosol generator to the mold groove inside the mounting base through the air inlet channel, which helps maintain the consistency of aerosol concentration during the detection process, thereby improving the accuracy and reliability of the detection results.

[0010] As a preferred technical solution, sampling holes are symmetrically opened at the bottom of the pressure head. The sampling holes pass through the pressure head, the fixing plate and the lifting seat. The sampling holes are connected to the particle counter, which can collect aerosol samples at the position closest to the mask after filtration. It can accurately obtain information such as the concentration and particle size distribution of particulate matter in the aerosol after filtration by the mask, avoiding detection errors caused by improper sampling position or changes in aerosol during transmission, thereby improving the accuracy and reliability of the detection results.

[0011] As a preferred technical solution, the buffer assembly includes a buffer plate, a buffer pad, and a buffer spring. The buffer plate is slidably sleeved on the outside of the support column, and the buffer pad is glued to the top of the buffer plate. Buffer springs are symmetrically fixed to the top of the base, and the other end of the buffer spring is fixedly connected to the bottom of the buffer plate. The buffer spring is sleeved on the outside of the support column, which can effectively absorb and disperse the impact force generated when the pressure head fixes the mask. It can prevent the mask from deforming due to excessive pressure, which would affect the test results of filtration efficiency. It can also protect the mask itself and the mold groove, pressure head, and other device components, and extend its service life.

[0012] As a preferred technical solution, the bottom of the fixing plate is symmetrically fixed with positioning posts, and the top of the mounting base is symmetrically provided with positioning holes. The positioning posts and positioning holes are plugged in, and the cooperation between the positioning posts and positioning holes can ensure that the relative position between the fixing plate and the mounting base is accurate.

[0013] In summary, the present invention has the following main advantages:

[0014] First, in this utility model, according to the mask model being tested, a matching mounting base is inserted into the mounting groove on the base. During the insertion process, the squeezing force applies pressure to the inclined surface of the locking block, causing the locking block to drive the moving plate to press against the return spring. The return spring is compressed, and the locking block retracts into the cavity. When the locking block moves to the locking groove, the return spring resets, and the locking block pops out and engages with the locking groove. This can adapt to various mask models. Moreover, through the universal design of the base, different mounting bases can be connected to the base through the same locking principle, which enhances the compatibility of the testing device with different mask models and reduces equipment costs and maintenance difficulty.

[0015] Secondly, in this utility model, the mask is placed inside the mold groove, the cylinder is activated, and the cylinder pushes the lifting seat to descend. At the same time, the lifting seat slides to a limit on the outside of the support column. When the lifting seat descends, it drives the pressure head to insert into the mold groove to fix the mask. At the same time, the lifting seat presses against the buffer plate, and the buffer plate descends. The buffer plate also presses against the buffer spring, and the buffer spring is compressed to absorb and disperse the impact force. This can effectively absorb and disperse the impact force generated when the pressure head fixes the mask, prevent the mask from deforming due to excessive pressure, and affect the test results of filtration efficiency. It can also protect the mask itself, as well as the mold groove, pressure head and other device components, and extend its service life. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is the utility model Figure 1 Enlarged view of part A;

[0018] Figure 3 This is a bottom-view three-dimensional structural diagram of the present invention;

[0019] Figure 4 This is a cross-sectional three-dimensional structural schematic diagram of the present invention;

[0020] Figure 5 This is the utility model Figure 4 Enlarged view of part B.

[0021] Reference numerals: 1. Mounting plate; 2. Base; 3. Support column; 4. Top plate; 5. Cylinder; 6. Lifting seat; 7. Mounting groove; 8. Mounting seat; 9. Mold groove; 10. Fixing plate; 11. Pressure head; 12. Sampling hole; 13. Particle counter; 14. Air inlet channel; 15. Aerosol generator; 16. Air pump; 17. Connecting pipe; 18. Fixing assembly; 181. Cavity; 182. Return spring; 183. Moving plate; 184. Locking block; 19. Locking groove; 20. Unlocking block; 21. Slider; 22. Slide groove; 23. Push groove; 24. Buffer assembly; 241. Buffer plate; 242. Buffer pad; 243. Buffer spring; 25. Positioning column; 26. Positioning hole. Detailed Implementation

[0022] Example

[0023] refer to Figures 1 to 5 The filtration efficiency testing device described in this embodiment includes a mounting plate 1, a base 2 fixedly connected to the top of the mounting plate 1, support columns 3 symmetrically fixedly connected to the top of the base 2, a buffer assembly 24 installed on the outside of the support columns 3, a top plate 4 fixedly connected to the other end of the support columns 3, cylinders 5 symmetrically installed on the top of the top plate 4, a lifting seat 6 fixedly connected to the telescopic end of the cylinder 5, a fixing plate 10 threadedly connected to the bottom of the lifting seat 6, a pressure head 11 fixedly connected to the bottom of the fixing plate 10, a particle counter 13 installed on the top of the lifting seat 6, a mounting seat 8 movably connected inside the base 2, a fixing assembly 18 symmetrically installed inside the mounting seat 8, a mold groove 9 opened on the top of the mounting seat 8, and an aerosol generator 15 installed on the top of the base 2.

[0024] The fixing assembly 18 includes a cavity 181, a return spring 182, a movable plate 183, and a locking block 184. The mounting base 8 has symmetrically arranged cavities 181 inside. A return spring 182 is fixedly connected to one side of each cavity 181, and a movable plate 183 is fixedly connected to the other end of the return spring 182. The movable plate 183 is slidably connected to the cavity 181. A locking block 184 is fixedly connected to the side of the movable plate 183 away from the return spring 182. The locking block 184 extends outward from the mounting base 8 and has a sloped bottom. The base 2 has a mounting groove 7 on its top, which is connected to the mounting base 8. For insertion, locking grooves 19 are provided on both sides of the mounting groove 7. The locking block 184 is snapped into the locking groove 19. According to the mask model being tested, the matching mounting base 8 is inserted into the mounting groove 7 on the base 2. During the insertion process, the squeezing force applies pressure to the inclined surface of the locking block 184, causing the locking block 184 to drive the moving plate 183 to press against the return spring 182. The return spring 182 is compressed, and the locking block 184 retracts into the cavity 181. When the locking block 184 moves to the locking groove 19, the return spring 182 returns to its original position, and the locking block 184 pops out and snaps into the locking groove 19.

[0025] refer to Figure 5 The base 2 has symmetrical push grooves 23 on its top, which are connected to the locking groove 19. The locking groove 19 has an unlocking block 20 slidably connected inside, and sliders 21 are fixedly connected to both sides of the unlocking block 20. The locking groove 19 has sliding grooves 22 on both sides, and the sliders 21 are slidably connected to the sliding grooves 22. Pushing the locking block 184 causes it to slide inside the locking groove 19. At the same time, the locking block 184 drives the sliders 21 to slide inside the sliding grooves 22. The unlocking block 20 pushes the locking block 184, causing the locking block 184 to drive the moving plate 183 to press against the return spring 182. The return spring 182 is compressed, and the locking block 184 retracts into the cavity 181. The locking block 184 and the locking groove 19 are no longer engaged.

[0026] refer to Figures 3 to 4 The bottom of the mounting slot 7 is provided with an air inlet channel 14, which is connected to the mold slot 9 inside the mounting base 8. An air pump 16 is installed on the top of the mounting plate 1. The air inlet end of the air pump 16 is connected to the aerosol generator 15, and the air outlet end of the air pump 16 is fixedly connected to a connecting pipe 17. The other end of the connecting pipe 17 is connected to the air inlet channel 14 inside the base 2. When the aerosol generator 15 is started, a uniform and stable aerosol is generated to simulate particulate pollution in the actual environment. Common types include compressed air sprayers and ultrasonic atomizers. The appropriate aerosol generation method can be selected according to different detection needs to generate aerosol particles of different sizes and concentrations. The gas is sent into the air inlet channel 14 through the air pump 16 and the connecting pipe 17, and then the gas inside the air inlet channel 14 enters the mold slot 9.

[0027] refer to Figure 1 and Figure 3 The bottom of the pressure head 11 is symmetrically provided with sampling holes 12, which pass through the pressure head 11, the fixing plate 10 and the lifting seat 6. The sampling holes 12 are connected to the particle counter 13. Through the particle counter 13, the relevant parameters of particulate matter in the aerosol after being filtered by the mask can be measured. The concentration and particle size distribution of particulate matter in the aerosol after being filtered by the mask can be obtained. By comparing with the relevant data of particulate matter in the aerosol before the mask, the filtration efficiency of the mask for particulate matter of different particle sizes can be calculated.

[0028] refer to Figure 2 The buffer assembly 24 includes a buffer plate 241, a buffer pad 242, and a buffer spring 243. The buffer plate 241 is slidably sleeved on the outside of the support column 3. The buffer pad 242 is glued to the top of the buffer plate 241. The buffer spring 243 is symmetrically fixedly connected to the top of the base 2. The other end of the buffer spring 243 is fixedly connected to the bottom of the buffer plate 241. The buffer spring 243 is sleeved on the outside of the support column 3. When the mask is placed inside the mold groove 9, the cylinder 5 is activated. The cylinder 5 pushes the lifting seat 6 to descend. At the same time, the lifting seat 6 slides to a limit outside the support column 3. When the lifting seat 6 descends, it drives the pressure head 11 to insert into the mold groove 9 to fix the mask. At the same time, the lifting seat 6 presses against the buffer plate 241, and the buffer plate 241 descends. The buffer plate 241 also presses against the buffer spring 243, and the buffer spring 243 is compressed to absorb and disperse the impact force.

[0029] refer to Figure 1 and Figure 3 The bottom of the fixed plate 10 is symmetrically fixed with positioning posts 25, and the top of the mounting base 8 is symmetrically provided with positioning holes 26. The positioning posts 25 and the positioning holes 26 are inserted into each other. When the lifting base 6 drives the pressure head 11 to descend, the positioning posts 25 at the bottom of the fixed plate 10 are inserted into the positioning holes 26.

[0030] Operating principle and advantages: First, according to the mask model being tested, the matching mounting base 8 is inserted into the mounting groove 7 on the base 2. During insertion, the squeezing force applies pressure to the inclined surface of the locking block 184, causing the locking block 184 to drive the moving plate 183 to press against the return spring 182. The return spring 182 is compressed, and the locking block 184 retracts into the cavity 181. When the locking block 184 moves to the locking groove 19, the return spring 182 resets, and the locking block 184 pops out and engages with the locking groove 19. Then, the mask is placed into the mold groove 9, and the cylinder 5 is activated. The cylinder 5 pushes the lifting seat 6 to descend. At the same time, the lifting seat 6 slides to a limit outside the support column 3. When the lifting seat 6 descends, it drives the pressure head 11 to insert into the mold groove 9, pressing the mask. The device is fixed in place, and simultaneously the lifting seat 6 presses against the buffer plate 241, causing the buffer plate 241 to descend. Simultaneously, the buffer plate 241 presses against the buffer spring 243, compressing the buffer spring 243. This activates the aerosol generator 15, producing a uniform and stable aerosol to simulate particulate pollution in the actual environment. Gas is then pumped into the air intake channel 14 via the air pump 16 and connecting pipe 17. The gas then enters the mold trough 9, and the particle counter 13 is activated. This counter can specifically measure the relevant parameters of particulate matter in the aerosol after filtration by the mask, obtaining the concentration and particle size distribution of particulate matter in the aerosol after filtration. By comparing this data with the relevant data of particulate matter in the aerosol before filtration, the filtration efficiency of the mask for different particle sizes can be calculated.

[0031] This invention can be adapted to various types of masks, and through the universal design of the base 2, different mounting seats 8 can be connected to the base 2 through the same locking principle, which enhances the compatibility of the testing device with different mask models and reduces equipment costs and maintenance difficulty.

Claims

1. A filter efficiency detection device comprising a mounting plate (1), characterised in that: The mounting plate (1) top fixedly connected with base (2), the base (2) top symmetry fixedly connected with support column (3), the support column (3) outside installation has the buffer assembly (24), the support column (3) other end fixedly connected with top plate (4), the top plate (4) top symmetry installation has cylinder (5), the cylinder (5) telescopic end fixedly connected with lifting seat (6), the lifting seat (6) bottom screw thread connection has fixed plate (10), the fixed plate (10) bottom fixedly connected with pressure head (11), the lifting seat (6) top installation has particle counter (13), the base (2) inside movably connected with mounting seat (8), the mounting seat (8) inside symmetry installation has fixed assembly (18), the mounting seat (8) top is equipped with mould groove (9), the base (2) top installation has aerosol generator (15); The fixed assembly (18) includes cavity (181), reset spring (182), moving plate (183) and locking block (184), the mounting seat (8) inside symmetry is equipped with cavity (181), the cavity (181) inside one side fixedly connected with reset spring (182), the other end of reset spring (182) is fixedly connected with moving plate (183), the moving plate (183) and cavity (181) inside are slidably connected, the moving plate (183) is fixedly connected with locking block (184) away from reset spring (182) one side, the locking block (184) extends outside the mounting seat (8), the locking block (184) bottom is equipped with inclined plane.

2. The filter efficiency detection device according to claim 1, characterized in that: The base (2) top is equipped with mounting groove (7), the mounting groove (7) is inserted with mounting seat (8), the mounting groove (7) inside both sides are equipped with locking groove (19), the locking block (184) is connected with locking groove (19) with the clamping.

3. The filter efficiency detection device of claim 2, wherein: The base (2) top symmetry is equipped with push groove (23), the push groove (23) is communicated with locking groove (19) inside, the locking groove (19) inside slidably connected with unlocking block (20), the unlocking block (20) both sides are fixedly connected with sliding block (21), the locking groove (19) inside both sides are equipped with sliding slot (22), the sliding block (21) is slidably connected with sliding slot (22).

4. The filter efficiency detection device of claim 3, wherein: The mounting groove (7) groove bottom is equipped with air inlet channel (14), the air inlet channel (14) is communicated with mould groove (9) inside the mounting seat (8), the mounting plate (1) top installation has air pump (16), the air inlet end of air pump (16) is communicated with aerosol generator (15), the air outlet end of air pump (16) is fixedly connected with connecting pipe (17), the other end of connecting pipe (17) is communicated with air inlet channel (14) inside the base (2).

5. The filter efficiency detection device of claim 1, wherein: The pressure head (11) bottom symmetry is equipped with sampling hole (12), the sampling hole (12) penetrates pressure head (11), fixed plate (10) and lifting seat (6), the sampling hole (12) is communicated with particle counter (13).

6. The filter efficiency detection device of claim 1, wherein: The buffer assembly (24) comprises a buffer plate (241), a buffer pad (242) and a buffer spring (243), the support column (3) is sleeved with the buffer plate (241) outside, the buffer pad (242) is glued on the top of the buffer plate (241), the base (2) is fixedly connected with the buffer spring (243) on the top, the other end of the buffer spring (243) is fixedly connected with the bottom of the buffer plate (241), and the buffer spring (243) is sleeved outside the support column (3).

7. The filter efficiency detection device of claim 1, wherein: The bottom of the fixed plate (10) is fixedly connected with a positioning column (25), the top of the mounting seat (8) is symmetrically provided with a positioning hole (26), and the positioning column (25) and the positioning hole (26) are inserted.

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