A device for testing the filtration efficiency of a mask particle

Abstract

The utility model relates to a kind of mask particle filtration efficiency testing device, it includes upper machine stand and lower machine stand connected with rear side communication, upper clamp being lifted and arranged in the bottom of upper machine stand, lower clamp being set in the top surface of lower machine stand and corresponding with upper clamp, support frame being set in the top surface of lower machine stand and positioning assembly being set in the top end of support frame;Lower clamp is set in support frame, and the top surface of positioning assembly is flush with the top surface of lower clamp;When testing, the clamping ring of the utility model positioning assembly is fastened in lower chuck mouth along by clamping assembly, mask edge is hung on positioning nail, prevent sample from extruding hand when being placed, then press control switch, control upper lifting rod to rise, make upper chuck and lower chuck buckle, separate;Lower chuck and upper chuck buckle clamping mask can be measured normally;Such detection operation is simple and convenient, safe, reliable in performance, and positioning assembly is easy to dismount and install.

Description

Technical Field

[0001] This utility model relates to a device for testing the particle filtration efficiency of face masks, belonging to the field of testing technology. Background Technology

[0002] Air pollution is severe due to continuous emissions from factories, vehicle exhaust, power plants, and other sources. Exposure to this polluted air has led to respiratory illnesses and other health problems. Masks have become essential items for most people during disaster relief and rescue operations. Currently, there are many types of masks on the market, but their effectiveness depends primarily on their particulate filtration performance, which consumers often struggle to distinguish between good and bad. To enable consumers to choose masks with good particulate filtration performance, it is necessary to test their particulate filtration efficiency. However, current testing devices are difficult to use, and the process is prone to hand injuries and inefficient. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a safe, reliable and convenient sample placement device for testing the particle filtration efficiency of face masks.

[0004] The present invention adopts the following technical solution:

[0005] This utility model mask particle filtration efficiency testing device includes an upper base and a lower base connected at the rear, an upper clamp that is lifted and installed at the bottom of the upper base, a lower clamp that is installed on the top surface of the lower base and corresponds to the upper clamp, a support frame installed on the top surface of the lower base, and a positioning component installed at the top of the support frame; the lower clamp is installed inside the support frame, and the top surface of the positioning component is flush with the top surface of the lower clamp.

[0006] The support frame of this utility model is a square frame. The positioning component includes springs installed at the four corners of the top of the support frame, clamping rings installed between the other ends of the four springs, and positioning pins fixed at intervals on the top surface of the clamping rings. The springs are all horizontally stretched so that the clamping rings are horizontally fitted onto the lower clamp. A clamping component is provided at the opening of the clamping rings to clamp the clamping rings.

[0007] The clamping assembly of this utility model includes an ear plate A disposed at one end of the opening of the clamping ring, an ear plate B disposed at the other end of the opening of the clamping ring parallel to the ear plate A, and a bolt threaded on the ear plate A and the ear plate B, with a nut screwed to the other end of the bolt.

[0008] The present invention includes an upper lifting rod connected to an upper base and an upper chuck in the shape of a bowl installed at the bottom of the upper lifting rod; an aerosol delivery pipe communicating with the inner cavity of the upper chuck is provided on the side wall of the upper chuck; the lower clamp includes a support column installed on the top surface of the lower base and a lower chuck in the shape of a bowl installed on the top of the support column; a lower aerosol output pipe communicating with the inner cavity of the lower chuck is installed on the side wall of the lower chuck; a clamping ring is fitted onto the edge of the lower chuck, and the clamping ring is clamped to the lower chuck by a clamping assembly; the upper lifting rod is controlled to rise and fall to engage and disengage the upper chuck and the lower chuck.

[0009] This invention features an aerosol-gas mixing flow meter installed on one side of the upper base. The upper base panel includes an aerosol flow meter, a control switch, a temperature display, and a heating switch. A compressed air inlet pipe is installed on one side of the lower base. An aerosol generator and a liquid cup are housed within the lower base, with the outlet of the compressed air inlet pipe located inside the liquid cup. A mixing pipe communicating with the inner cavity of the aerosol generator is installed on its side wall, with the inlet of the mixing pipe located inside the liquid cup and above the liquid surface. The aerosol generator and the aerosol flow meter are connected via a connecting pipe A, and the aerosol flow meter and the aerosol-gas mixing flow meter are connected via a connecting pipe B. A compressed air branch pipe is installed between the compressed air inlet pipe and the aerosol-gas mixing flow meter. The input end of the aerosol delivery pipe is connected to the aerosol-gas mixing flow meter. Compressed air enters the liquid cup containing a 2% sodium chloride solution from the compressed air inlet pipe. The compressed air carrying the sodium chloride solution enters the aerosol generator, is heated to form sodium chloride aerosol, and then passes through the aerosol flow meter into the aerosol-gas mixing flow meter.

[0010] The positive effects of this utility model are as follows: During the test, the clamping ring of the positioning component of this utility model is fastened to the edge of the lower clamp by the clamping component, and the edge of the mask is hung on the positioning nail to prevent the sample from squeezing the hand. Then, the control switch is pressed to control the upper lifting rod to rise and fall so that the upper clamp and the lower clamp are engaged and disengaged. When the lower clamp and the upper clamp are engaged and clamp the mask, the sample can be measured normally. This testing operation is simple, convenient, safe, reliable, and the positioning component is easy to disassemble and install. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Appendix Figure 2 This is a top view of the positioning component of this utility model;

[0013] Appendix Figure 3 This is a schematic diagram of the corresponding structure of the upper and lower clamps of this utility model.

[0014] In the attached diagram: 1 Upper base, 2 Lower base, 31 Upper lifting rod, 32 Upper clamp, 33 Aerosol delivery pipe, 41 Support column, 42 Lower clamp, 43 Lower aerosol output pipe, 44 Aerosol generator, 45 Liquid cup, 46 Mixing pipe, 47 Connecting pipe A, 48 Connecting pipe B, 49 Compressed air branch pipe, 5 Support frame, 6 Spring, 7 Clamping ring, 8 Positioning pin, 9 Ear plate A, 10 Ear plate B, 11 Bolt, 12 Nut, 13 Glue-gas mixing flow meter, 14 Aerosol flow meter, 15 Control switch, 16 Temperature display, 17 Heating switch, 18 Compressed air inlet pipe. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in detail below:

[0016] As attached Figure 1-3 As shown, this utility model includes an upper base 1 and a lower base 2 connected at the rear, an upper clamp that is lifted and disposed at the bottom of the upper base 1, a lower clamp disposed on the top surface of the lower base 2 corresponding to the upper clamp, a support frame 5 disposed on the top surface of the lower base 2, and a positioning component disposed on the top of the support frame 5; the lower clamp is disposed inside the support frame 5, and the top surface of the positioning component is flush with the top surface of the lower clamp. An aerosol-gas mixing flow meter 13 is disposed on one side of the upper base 1, and an aerosol flow meter 14, a control switch 15, a temperature display 16, and a heating switch 17 are disposed on the panel of the upper base 1; a compressed air inlet pipe 18 is disposed on one side of the lower base 2.

[0017] As attached Figure 2 As shown, the support frame 5 of this utility model is a square frame. The positioning assembly includes springs 6 installed at the four corners of the top of the support frame 5, clamping rings 7 installed between the openings at the other ends of the four springs 6, and positioning pins 8 fixed at intervals on the top surface of the clamping rings 7. The positioning pins 8 are steel needles used to hang the edges of the mask. The springs 6 are all horizontally stretched so that the clamping rings 7 are horizontally fitted onto the lower clamp. A clamping assembly is provided at the opening of the clamping rings 7 to clamp the clamping rings 7. The clamping assembly includes an ear plate A9 provided at one end of the opening of the clamping rings 7, an ear plate B10 provided at the other end of the opening of the clamping rings 7 parallel to the ear plate A9, and bolts 11 threaded on the ear plates A9 and B10. Nuts 12 are screwed to the other end of the bolts 11.

[0018] As attached Figure 1 , 3 As shown, the upper clamp of this utility model includes an upper lifting rod 31 connected to the upper base 1 and an upper chuck 32 in the shape of a bowl installed at the bottom of the upper lifting rod 31; an aerosol delivery pipe 33 is provided on the side wall of the upper chuck 32 and communicates with its inner cavity; the inlet end of the aerosol delivery pipe 33 is connected to the aerosol-gas mixing flow meter 13; the aerosol that meets the standard is output into the inner cavity of the upper chuck 32 through the aerosol delivery pipe 33.

[0019] The lower clamp of this utility model includes a support column 41 connected to the top surface of the lower base 2 and a bowl-shaped lower clamp 42 installed at the top of the support column 41; a lower aerosol output pipe 43 communicating with its inner cavity is installed on the side wall of the lower clamp 42; the lower aerosol output pipe 43 discharges the tested aerosol; an aerosol generator 44 and a liquid cup 45 are arranged inside the lower base 2, and the outlet end of the compressed air inlet pipe 18 is located inside the liquid cup 45; a mixing pipe 46 communicating with its inner cavity is installed on the side wall of the aerosol generator 44, and the inlet end of the mixing pipe 46 is located inside the liquid cup 45 and above the liquid surface; the aerosol generator 44 and the aerosol flow meter 14 are connected by a connecting pipe A47, and the aerosol flow meter 14 and the aerosol-gas mixing flow meter 13 are connected by a connecting pipe B48; a compressed air branch pipe 49 is arranged between the compressed air inlet pipe 18 and the aerosol-gas mixing flow meter 13.

[0020] Turn on the heating switch 17. Observe the temperature display on the panel 16. After reaching the specified temperature, compressed air enters the liquid cup 44 containing sodium chloride solution through the compressed air inlet pipe 18. The compressed air carrying sodium chloride droplets enters the aerosol generator 34, where it is heated to vaporize, producing a high concentration of sodium chloride aerosol. The flow rate is measured by the aerosol flow meter 14 through the connecting pipe A47, and then enters the aerosol-gas mixing flow meter 13 through the connecting pipe B48 to mix with the compressed air entering through the compressed air branch pipe 49. By adjusting the compressed air flow rate and the aerosol flow rate, a standard aerosol is produced (the sodium chloride aerosol particle size distribution should be a median diameter (CMD) of 0.075μm ± 0.020μm, with a geometric standard deviation not exceeding 1.86 (equivalent to an aerodynamic mass median diameter (MMAD) of 0.24μm ± 0.06μm), and the concentration does not exceed 200mg / m³. 3 Aerosol particles must be heated, mixed, pressurized, and electrostatically neutralized before testing; this is a well-known technique and will not be elaborated upon here. The overall structure is the LFY-706C particulate matter filtration efficiency and airflow resistance tester.

[0021] The clamping ring 7 of this utility model is fitted onto the edge of the lower clamp 42. The clamping ring 7 is clamped to the lower clamp 42 by the clamping assembly. The top surface of the clamping ring 7 is flush with the top surface of the edge of the lower clamp 42. The upper lifting rod 31 is controlled to rise and fall to make the upper clamp 32 engage and disengage from the lower clamp 42.

[0022] During operation, an appropriate amount of 2% sodium chloride solution is added to the liquid cup 45. Sodium chloride droplets are blown out by compressed air and enter the aerosol generator 44 through the mixing pipe 46, generating a high-concentration sodium chloride aerosol. The flow rate is measured by the aerosol flow meter 14, and then enters the aerosol-gas mixing flow meter 13. By adjusting the compressed air flow rate and the aerosol flow rate, a standard-compliant aerosol is generated; (the sodium chloride aerosol particle size distribution should be a median diameter (CMD) of 0.075 μm ± 0.020 μm, a geometric standard deviation not exceeding 1.86 (equivalent to an aerodynamic mass median diameter (MMAD) of 0.24 μm ± 0.06 μm), and a concentration not exceeding 200 mg / m³. 3 The compliant aerosol enters the inner cavity of the upper clamp 32 through the aerosol delivery tube 33; the aerosol then enters the inner cavity of the lower clamp 42 through the mask being tested, which is clamped between the upper clamp 32 and the lower clamp 42, and is then discharged through the lower exhaust tube 43.

[0023] During the test, the clamping ring 7 of the positioning component of this utility model is fastened to the edge of the lower clamp 42 through the clamping component. The air compressor valve is turned on, the aerosol generator is turned on, and the aerosol flow rate is adjusted to a suitable standard. Then, the control switch 15 is pressed to separate the upper clamp 32 from the lower clamp 42. The edge of the mask (the mask is a medical protective mask) is hung on the positioning nail 8. Then, the control switch 15 is pressed again, and the upper clamp 32 and the lower clamp 42 are fastened together by pneumatics to clamp the mask. The upper clamp and the lower clamp are well sealed around the mask without any air leakage. The sample is tested. The aerosol in the upper clamp 32 enters the lower clamp 42 through the mask. During the test, the flow rate on the panel is kept stable and the computer graph is observed. When the concentration-time curve reaches stability, the test is stopped and the test results are recorded. During the test, the aerosol in the lower clamp 42 is discharged through the lower exhaust pipe 43.

[0024] This testing procedure is simple, sample placement is convenient, it is safe and reliable, and the positioning components are easy to disassemble and install, greatly improving work efficiency.

[0025] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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. Such 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 this utility model.

Claims

1. A device for testing the filtration efficiency of a mask particle, characterized in that, It includes an upper base (1) and a lower base (2) connected at the rear, an upper clamp that is raised and lowered at the bottom of the upper base (1), a lower clamp that is set on the top surface of the lower base (2) and corresponds to the upper clamp, a support frame (5) set on the top surface of the lower base (2), and a positioning component set on the top of the support frame (5); the lower clamp is set inside the support frame (5), and the top surface of the positioning component is flush with the top surface of the lower clamp.

2. The device of claim 1, wherein, The support frame (5) is a square frame. The positioning components include springs (6) installed on the four corners of the top of the support frame (5), clamping rings (7) installed between the other ends of the four springs (6) and positioning pins (8) fixed at intervals on the top surface of the clamping rings (7). The springs (6) are all horizontally stretched so that the clamping rings (7) are horizontally fitted on the lower clamp. A clamping assembly is provided at the opening of the clamping ring (7) to clamp the clamping ring (7).

3. The device of claim 2, wherein, The clamping assembly includes an ear plate A (9) disposed at one end of the opening of the clamping ring (7), an ear plate B (10) disposed at the other end of the opening of the clamping ring (7) parallel to the ear plate A (9), and a bolt (11) threaded on the ear plate A (9) and the ear plate B (10), with a nut (12) screwed to the other end of the bolt (11).

4. The device of claim 3, wherein the device is configured to test the filtration efficiency of a mask particle. The upper clamp includes an upper lifting rod (31) connected to the upper base (1) and an upper chuck (32) in the shape of a bowl installed at the bottom of the upper lifting rod (31); an aerosol delivery pipe (33) communicating with its inner cavity is provided on the side wall of the upper chuck (32); The lower clamp includes a support column (41) installed on the top surface of the lower base (2) and a cup-shaped lower chuck (42) installed on the top of the support column (41); a lower aerosol output pipe (43) communicating with its inner cavity is installed on the side wall of the lower chuck (42); the clamping ring (7) is fitted on the edge of the lower chuck (42), and the clamping ring (7) is clamped to the lower chuck (42) by the clamping assembly; Control the lifting rod (31) to rise and fall so that the upper clamp (32) and the lower clamp (42) can engage and disengage.

5. A device for testing the filtration efficiency of a mask particle according to claim 4, wherein, An aerosol flow meter (13) is installed on one side of the upper base (1), and an aerosol flow meter (14), a control switch (15), a temperature display (16) and a heating switch (17) are installed on the panel of the upper base (1); a compressed air inlet pipe (18) is installed on one side of the lower base (2); An aerosol generator (44) and a liquid cup (45) are installed inside the lower base (2), and the outlet of the compressed air inlet pipe (18) is located inside the liquid cup (45). A mixing pipe (46) communicating with the inner cavity of the aerosol generator (44) is installed on the side wall. The inlet end of the mixing pipe (46) is located inside the liquid cup (45) and above the liquid surface. The aerosol generator (44) and the aerosol flow meter (14) are connected by a connecting pipe A (47). The aerosol flow meter (14) and the gel-gas mixing flow meter (13) are connected by a connecting pipe B (48). A compressed air branch pipe (49) is set between the compressed air inlet pipe (18) and the gel-gas mixing flow meter (13). The input end of the aerosol delivery pipe (33) is connected to the gel-gas mixing flow meter (13). Compressed air enters a liquid cup (45) containing a 2% sodium chloride solution from the compressed air inlet pipe (18). The compressed air carrying the sodium chloride solution enters the aerosol generator (44), is heated to form sodium chloride aerosol, and enters the aerosol-gas mixture flow meter (13) through the aerosol flow meter (14).

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