A water vapor filtration efficiency test bench

Abstract

This utility model provides a water vapor filtration efficiency test bench, belonging to the technical field of water vapor filtration efficiency testing. It includes an equipment housing with a test chamber inside, where the sample to be tested is placed. An air compressor is located on the outside of the housing. The housing also contains a gas mixing tank, a humidifying water tank, and a nitrogen cylinder. One end of the humidifying water tank's inlet pipe is connected to the air compressor, and the other end extends into the humidifying water tank and is connected to an aeration head. The inlet of the gas mixing tank is connected to the outlets of the humidifying water tank and the nitrogen cylinder, and the outlet of the gas mixing tank is connected to the test chamber. A first temperature and humidity sensor is installed inside the gas mixing tank. The built-in humidifying water tank, with an aeration head installed on its inlet pipe, allows for controlled generation of high-humidity gas during the test. A mixing chamber for humid and dry gas is provided in front of the test chamber, thus solving the problems of low humidity control accuracy and large fluctuations.

Description

Technical Field

[0001] This utility model belongs to the field of water vapor filtration efficiency testing technology, specifically relating to a water vapor filtration efficiency testing bench. Background Technology

[0002] Testing the water vapor filtration efficiency is particularly important for the structure of the filter canister and the selection of filter materials. With the continuous development of the respirator industry and the continuous improvement of the performance requirements of respirators, the filtration efficiency of the filter canister is an important indicator of respirators, and water vapor filtration efficiency is an essential component of the filter canister.

[0003] Currently, instruments used in laboratories generally suffer from the following problems: humidification tanks are usually directly connected to air compressors, resulting in a constant humidity level or reliance on air compressors to change the humidity content. This not only limits the humidity adjustment range and makes it difficult to meet the needs of high humidity testing, but also lacks efficient gas mixing devices in traditional testing equipment, making it difficult to accurately control the mixing ratio of moisture and dry gas, which further affects the stability and repeatability of test results. Summary of the Invention

[0004] To overcome the above shortcomings, this utility model provides a water vapor filtration efficiency test bench to solve the problems of limited humidity control range and difficulty in controlling the mixing ratio of humid and dry air in existing test devices.

[0005] This utility model is implemented as follows:

[0006] A water vapor filtration efficiency test bench includes: an equipment housing, a test chamber for placing a sample to be tested inside the housing, an air compressor on the outside of the housing, and a gas mixing tank, a humidifying water tank, and a nitrogen cylinder inside the housing; one end of the air inlet pipe of the humidifying water tank is connected to the air compressor, and the other end extends into the humidifying water tank and is connected to an aeration head; the air inlet of the gas mixing tank is connected to the air outlets of the humidifying water tank and the nitrogen cylinder, the air outlet of the gas mixing tank is connected to the test chamber, and a first temperature and humidity sensor is installed inside the gas mixing tank.

[0007] In addition, the water vapor filtration efficiency test bench provided by this utility model may also have the following additional technical features:

[0008] In the above technical solution, the bottom of the humidifying water tank is fixedly connected to the bottom plate of the equipment box through a water tank frame, and a water tank cover is provided on the top of the humidifying water tank; the humidifying water tank is equipped with a heating tube, a water tank outlet connector, a liquid level switch and a temperature sensor, and the heating tube, water tank outlet connector, air inlet pipe, liquid level switch and the first temperature sensor are respectively threaded to the water tank cover, and the threads are sealed with PTFE tape; the bottom of the humidifying water tank is threadedly connected to a water tank drain connector, and the threads are sealed with PTFE tape; a liquid level indicator is provided on the side of the humidifying water tank.

[0009] In the above technical solution, the gas mixing tank is fixed to the frame inside the equipment box by screws; the side of the gas mixing tank is provided with a mixing tank inlet, which is equipped with a first solenoid valve and is connected to the water tank outlet connector and the nitrogen cylinder outlet; the bottom of the gas mixing tank is threadedly connected to a mixing tank drain connector, and the side of the gas mixing tank is threadedly installed with a mixing tank exhaust connector; the top of the gas mixing tank is provided with a first temperature and humidity sensor and a mixing tank outlet connector, and a second solenoid valve is provided on the mixing tank outlet connector, which is connected to the test chamber of the specimen.

[0010] In the above technical solution, the test chamber includes an air inlet chamber and an air outlet collection chamber. The air inlet chamber is fixed to the air outlet collection chamber by clamps and is sealed with a silicone sealing ring. The air inlet chamber is equipped with a test chamber air inlet connector and a third temperature and humidity sensor, and the test chamber air inlet connector and the third temperature and humidity sensor are threaded to the air inlet chamber, with the threads sealed with PTFE tape. The test chamber air inlet connector is connected to the mixing tank air outlet connector. The air outlet collection chamber is equipped with a dew point sensor, a second temperature sensor, and a test chamber air outlet connector, and the dew point sensor, the second temperature sensor, and the test chamber air outlet connector are threaded to the air outlet collection chamber, with the threads sealed with PTFE tape. The air outlet collection chamber is installed on the upper box reinforcing rib inside the equipment housing by screws.

[0011] In the above technical solution, a through hole is provided on the connection surface between the exhaust gas collection chamber and the intake gas chamber, and a test piece mounting seat is provided around the through hole, on which the test piece to be tested can be placed.

[0012] In the above technical solution, the outer walls of both the humidification water tank and the gas mixing tank are covered with an insulation layer.

[0013] In the above technical solution, a touch screen is installed on the equipment housing.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This invention significantly improves the accuracy and stability of water vapor filtration efficiency testing through the synergistic design of a built-in humidification tank and a gas mixing tank. The humidification tank, with its aeration head structure and heating tube, efficiently generates high-humidity gas, enabling wide-range humidity regulation. The gas mixing tank, by precisely controlling the mixing ratio of wet and dry gas and using multi-level temperature and humidity sensors for real-time monitoring, effectively solves the problems of low humidity control accuracy and large fluctuations in traditional testing devices. The specimen testing chamber adopts a split-type sealed design to ensure the airtightness of the testing environment, and is equipped with an intelligent touch screen for real-time parameter monitoring and adjustment, making the entire testing process more convenient and reliable. This test bench is not only suitable for performance testing of breathing mask filter canisters, but can also be extended to other fields of filter material testing that require precise humidity control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a water vapor filtration efficiency test bench according to the present invention;

[0018] Figure 2 This is a schematic diagram of the humidification water tank of a water vapor filtration efficiency test bench according to the present invention;

[0019] Figure 3 This is a schematic diagram of the gas mixing tank of a water vapor filtration efficiency test bench according to the present invention;

[0020] Figure 4 This is a schematic diagram of the test chamber of a water vapor filtration efficiency test bench according to the present invention.

[0021] Figure 5 This is a schematic diagram of the gas path system assembly of a water vapor filtration efficiency test bench according to the present invention.

[0022] In the diagram: 1. Equipment housing; 2. Touch screen display; 3. Specimen testing chamber; 4. Air compressor; 5. Air inlet chamber; 6. Test chamber air inlet connector; 7. Second temperature and humidity sensor; 8. Specimen mounting base; 9. Clamp; 10. Exhaust gas collection chamber; 11. Dew point sensor; 12. Second temperature sensor; 13. Test chamber exhaust port connector; 14. Heating tube; 17. Water tank frame; 18. Drain port connector; 19. Water tank exhaust port connector; 20. Air inlet pipe; 21. Liquid level switch; 22. Liquid level; 23. First temperature sensor; 24. Aeration head; 25. First solenoid valve; 28. First temperature and humidity sensor; 29. ​​Second solenoid valve; 30. Mixing tank exhaust port connector; 31. Drain port. 32. Connector; 33. Nitrogen cylinder; 34. Second pressure reducing valve; 35. Second ball valve; 36. Third solenoid valve; 37. First mass flow controller; 38. Fourth solenoid valve; 39. Fifth solenoid valve; 40. Gas mixing tank; 41. Third check valve; 42. Sixth solenoid valve; 43. Fifth check valve; 44. Ninth solenoid valve; 45. Third ball valve; 46. Eighth solenoid valve; 47. Fourth ball valve; 48. Sixth check valve; 49. Fourth ball valve; 50. Tenth solenoid valve; 51. Humidifying water tank; 52. First check valve; 53. Seventh check valve; 54. Second mass flow controller; 55. Seventh solenoid valve; 56. First pressure reducing valve; 57. First ball valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] A water vapor filtration efficiency test bench, such as Figure 1 As shown, the equipment includes: an equipment housing 1, which is made of galvanized steel sheet with a spray coating to prevent rust; a test chamber 3 is provided inside the equipment housing 1, and the test sample to be tested is placed in the test chamber 3; an air compressor 4 is provided on the outside of the equipment housing 1; the equipment housing 1 also includes a gas mixing tank 40, a humidifying water tank 51, and a nitrogen cylinder 32; one end of the air inlet pipe 20 of the humidifying water tank 51 is connected to the air compressor 4, and the other end extends into the humidifying water tank 51 and is connected to an aeration head 24; the air inlet of the gas mixing tank 40 is connected to the air outlet of the humidifying water tank 51 and the nitrogen cylinder 32, and the air outlet of the gas mixing tank 40 is connected to the test chamber 3; and a first temperature and humidity sensor 28 is provided inside the gas mixing tank 40.

[0025] Specifically, the synergistic design of the humidifying water tank 51 and the gas mixing tank 40 built into the equipment housing 1 significantly improves the accuracy and stability of water vapor filtration efficiency testing. The humidifying water tank 51, with its aeration head 24 structure and heating tube 14, can efficiently generate high-humidity gas and achieve a wide range of humidity regulation. The gas mixing tank 40, by precisely controlling the mixing ratio of wet and dry gas and cooperating with temperature and humidity sensors for real-time monitoring, effectively solves the problems of low humidity control accuracy and large fluctuations in traditional test devices. The specimen test chamber 3 adopts a split-type sealed design to ensure the airtightness of the test environment, and is equipped with an intelligent touch screen 2 to realize real-time parameter monitoring and adjustment, making the entire test process more convenient and reliable. This test bench is not only suitable for the performance testing of breathing mask filter canisters, but can also be extended to other filter material testing fields that require precise humidity control.

[0026] In an embodiment of this utility model, as shown in Figure 2, the bottom of the humidifying water tank 51 is fixedly connected to the bottom plate of the equipment housing 1 via a water tank frame 17, and a water tank cover is provided on the top of the humidifying water tank 51; a heating tube 14, a water tank outlet connector 19, a liquid level switch 21, and a temperature sensor 23 are provided on the humidifying water tank 51, and the heating tube 14, the water tank outlet connector 19, the air inlet pipe 20, the liquid level switch 21, and the first temperature sensor 23 are respectively threadedly connected to the water tank cover, and the threads are sealed with PTFE tape; a water tank drain outlet connector 18 is threadedly connected to the bottom of the humidifying water tank 51, and the threads are sealed with PTFE tape; a liquid level 22 is provided on the side of the humidifying water tank 51.

[0027] Specifically, after the heating tube 14 heats the water in the water tank to the set temperature, the compressed air passes through the air inlet pipe 20 and then through the aeration head 24 to fully contact the water in the water tank, thereby achieving high humidity in the compressed air. At the same time, the liquid level 22 is set so that the liquid level 22 in the water tank can be observed.

[0028] In embodiments of this utility model, such as Figure 3 As shown, the gas mixing tank 40 is fixed to the inner frame of the equipment housing 1 by screws; the side of the gas mixing tank 40 is provided with a mixing tank air inlet, which is equipped with a first solenoid valve 25 and is connected to the water tank air outlet connector 19 and the air outlet of the nitrogen cylinder 32; the bottom of the gas mixing tank 40 is threadedly connected to a mixing tank drain outlet connector 31, and the side of the gas mixing tank 40 is threadedly installed with a mixing tank exhaust outlet connector 30; the top of the gas mixing tank 40 is provided with a first temperature and humidity sensor 28 and a mixing tank air outlet connector, and a second solenoid valve 29 is provided on the mixing tank air outlet connector, which is connected to the test chamber 3.

[0029] Specifically, the high humidity generated in the humidification tank 51 and the dry vapor output from the nitrogen cylinder 32 are both input into the gas mixing tank 40 for gas mixing. When the first temperature and humidity sensor 28 in the mixing tank detects that the specified humidity has been reached, the second solenoid valve 29 is opened, allowing the prepared humid gas to enter the test chamber 3 for water vapor filtration efficiency testing.

[0030] In embodiments of this utility model, such as Figure 4 As shown, the test chamber 3 includes an air inlet chamber 5 and an air outlet collection chamber 10. The air inlet chamber 5 is fixed to the air outlet collection chamber 10 by clamps 9 and is sealed with a silicone sealing ring. The air inlet chamber 5 is equipped with a test chamber air inlet connector 6 and a third temperature and humidity sensor 7, which are threaded to the air inlet chamber 5 and sealed with PTFE tape. The test chamber air inlet connector 6 is connected to the air outlet connector of the mixing tank. The air outlet collection chamber 10 is equipped with a dew point sensor 11, a second temperature sensor 12, and a test chamber air outlet connector 13, which are threaded to the air outlet collection chamber 10 and sealed with PTFE tape. The air outlet collection chamber 10 is installed on the upper reinforcing rib of the equipment housing 1 by screws.

[0031] Specifically, when moisture passes through the test specimen, the third temperature and humidity sensor 7 in the inlet chamber 5 can monitor the temperature and humidity parameters of the mixed gas entering the specimen in real time, while the dew point sensor 11 and the second temperature sensor 12 in the outlet collection chamber 10 accurately measure the dew point temperature and temperature value of the gas after filtration through the specimen. By comparing the temperature, humidity and dew point data at the inlet and outlet ends, the system can automatically calculate the filtration efficiency of the specimen for water vapor and evaluate its performance indicators. The outlet connector 13 of the test chamber discharges or transports the filtered gas to the subsequent processing device, completing the entire test process. The inlet chamber 5, the specimen mounting base 8, the clamp 9, and the outlet collection chamber 10 are all made of 304 stainless steel to prevent rust.

[0032] In embodiments of this utility model, such as Figure 4 As shown, a through hole is provided on the connection surface between the exhaust gas collection chamber 10 and the intake gas chamber 5, and a test piece mounting seat 8 is provided around the through hole, on which the test piece to be tested can be placed.

[0033] In embodiments of this utility model, such as Figure 2 and Figure 3 As shown, both the humidifying water tank 51 and the gas mixing tank 40 have insulation layers attached to their outer walls. Thus, the insulation layer on the outside of the humidifying water tank 51 keeps the heated water warm, and the insulation layer on the outside of the gas mixing tank 40 keeps the mixed gas warm.

[0034] In embodiments of this utility model, such as Figure 1 As shown, a touch screen 2 is installed on the equipment housing 1.

[0035] In embodiments of this utility model, such as Figure 5 This is a schematic diagram of the gas system assembly. The diagram includes a cleaning pipeline. Gas is supplied from nitrogen cylinder 32. The third solenoid valve 35, the first mass flow controller 36, the fourth solenoid valve 37, the fifth solenoid valve 38, the fourth check valve 39, and the sixth solenoid valve 42 are opened to clean the pipeline, gas mixing tank 40, and test chamber 3. This prevents residual water vapor and dust in the pipeline from interfering with subsequent humidity control and filtration efficiency measurement, and ensures all valves and sensors are in a stable state, reducing experimental errors. Between the air compressor 4 and the humidification tank 51, there is also a first pressure reducing valve 56, a first ball valve 57, a seventh solenoid valve 55, a second mass flow controller 54, and a first check valve 52, providing compressed air. After pressure reduction and switching control, the compressed air enters the humidification tank 51. When it is necessary to add humid and dry gas to the gas mixing tank 40, the first solenoid valve 25 at the mixing tank inlet is opened. The humid gas generated by the humidification tank 51 enters the gas system via the seventh check valve 53. The mixing tank 40 receives dry gas from nitrogen cylinder 32, which enters through the second pressure reducing valve 33, the second ball valve 34, the third solenoid valve 35, and the first mass flow controller 36. Within the mixing tank 40, the mixing ratio of wet and dry gas is monitored in real-time by the first temperature and humidity sensor 28. When the set humidity value is reached, the system closes the fifth solenoid valve 38, the eighth solenoid valve 46, the fourth ball valve 47, and the sixth check valve 48, and opens the second solenoid valve 29, the third check valve 41, and the sixth solenoid valve 42, delivering the mixed gas to the specimen testing chamber 3 for testing. After testing, the fifth check valve 43, the ninth solenoid valve 44, and the third ball valve 45 below the specimen testing chamber 3 are opened to exhaust the gas. Simultaneously, the tenth solenoid valve 50 and the fourth ball valve 49 are opened to drain water, ensuring no residual gas or liquid remains in the pipeline. All gas flow paths are connected via PU tubing and precisely controlled by the solenoid valves and mass flow controller, thereby achieving high-precision water vapor filtration efficiency testing.

[0036] Implementation process: During use, the test sample is installed on the specimen mounting base 8, and the silicone sealing ring between the air inlet chamber 5 and the air outlet collection chamber 10 is tightened and sealed by the clamp 9; the air compressor 4 and nitrogen cylinder 32 are turned on, and the first pressure reducing valve 56 and the second pressure reducing valve 33 are adjusted to make the air supply pressure reach the system set value; the touch screen 2 is operated to start the automatic test process: the system first opens the third solenoid valve 35, the first mass flow controller 36, the fourth solenoid valve 37, the fifth solenoid valve 38 and the sixth solenoid valve 42 to clean the pipeline and remove residual gas and impurities; after cleaning, the relevant valves are closed, the heating tube 14 starts to work, and heats the water in the humidification water tank 51 to the set temperature; then, the system automatically .... The flow controller 36, the fifth solenoid valve 38, the eighth solenoid valve 46, the second mass flow controller 54, and the seventh solenoid valve 55 precisely mix the high-humidity gas generated by the humidification tank 51 with the dry gas provided by the nitrogen cylinder 32 in the gas mixing tank 40. When the first temperature and humidity sensor 28 detects that the mixed gas has reached the set humidity, the system closes the eighth solenoid valve 46 and simultaneously opens the sixth solenoid valve 42 and the ninth solenoid valve 44 to deliver the prepared mixed gas to the test chamber 3 for testing. During the test, the second temperature and humidity sensor 7 and the dew point sensor 11 collect the temperature, humidity, and dew point data at the inlet and outlet in real time. After the test, the system automatically stops and calculates the water vapor filtration efficiency, thus completing the precise test of the filter tank performance.

[0037] It should be noted that the specific models and specifications of the touch screen 2, air compressor 4, second temperature and humidity sensor 7, dew point sensor 11, second temperature sensor 12, liquid level switch 21, liquid level 22, first temperature sensor 23, aeration head 24, first solenoid valve 25, first temperature and humidity sensor 28, second solenoid valve 29, nitrogen cylinder 32, second pressure reducing valve 33, second ball valve 34, third solenoid valve 35, first mass flow controller 36, fourth solenoid valve 37, fifth solenoid valve 38, fourth check valve 39, third check valve 41, sixth solenoid valve 42, fifth check valve 43, ninth solenoid valve 44, third ball valve 45, eighth solenoid valve 46, fourth ball valve 47, sixth check valve 48, fourth ball valve 49, tenth solenoid valve 50, first check valve 52, seventh check valve 53, second mass flow controller 54, seventh solenoid valve 55, first pressure reducing valve 56, and first ball valve 57 need to be selected and determined according to the actual specifications of the device, and therefore will not be described in detail.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water vapor filtration efficiency test bench, comprising an equipment housing (1), a specimen testing chamber (3) disposed within the equipment housing (1), a specimen to be tested placed within the specimen testing chamber (3), and an air compressor (4) disposed outside the equipment housing (1), characterized in that, The equipment housing (1) is also equipped with a gas mixing tank (40), a humidifying water tank (51), and a nitrogen cylinder (32). The air inlet pipe (20) of the humidifying water tank (51) is connected to the air compressor (4) at one end and extends into the humidifying water tank (51) at the other end, and is connected to the aeration head (24). The inlet of the gas mixing tank (40) is connected to the outlet of the humidifying water tank (51) and the nitrogen cylinder (32), the outlet of the gas mixing tank (40) is connected to the test chamber (3), and a first temperature and humidity sensor (28) is installed inside the gas mixing tank (40).

2. The water vapor filtration efficiency test bench according to claim 1, characterized in that, The bottom of the humidifying water tank (51) is fixedly connected to the bottom plate of the equipment box (1) through the water tank frame (17), and a water tank cover is provided on the top of the humidifying water tank (51); The humidifying water tank (51) is equipped with a heating tube (14), a water tank outlet connector (19), a liquid level switch (21) and a first temperature sensor (23). The heating tube (14), the water tank outlet connector (19), the air inlet pipe (20), the liquid level switch (21) and the first temperature sensor (23) are respectively threaded to the water tank cover, and the threads are sealed with PTFE tape. The bottom of the humidifying water tank (51) is threadedly connected to a water tank drain outlet connector (18), and the threads are sealed with PTFE tape. The humidification tank (51) has a liquid level (22) on its side.

3. The water vapor filtration efficiency test bench according to claim 2, characterized in that, The gas mixing tank (40) is fixed to the inner frame of the equipment housing (1) by screws; The gas mixing tank (40) is provided with a mixing tank air inlet on its side, and a first solenoid valve (25) is provided on it. The mixing tank air inlet is connected to the water tank air outlet connector (19) and the air outlet of the nitrogen cylinder (32). The bottom of the gas mixing tank (40) is threadedly connected to a mixing tank drain port connector (31), and the side of the gas mixing tank (40) is threadedly installed with a mixing tank exhaust port connector (30). A first temperature and humidity sensor (28) and a gas outlet connector are provided above the gas mixing tank (40), and a second solenoid valve (29) is provided on the gas outlet connector. The gas outlet connector is connected to the test chamber (3).

4. The water vapor filtration efficiency test bench according to claim 1, characterized in that, The test chamber (3) includes an air inlet chamber (5) and an air outlet collection chamber (10). The air inlet chamber (5) is fixed to the air outlet collection chamber (10) by a clamp (9) and is sealed with a silicone sealing ring. The air intake chamber (5) is provided with a test chamber air intake connector (6) and a third temperature and humidity sensor (7), and the test chamber air intake connector (6) and the third temperature and humidity sensor (7) are threadedly connected to the air intake chamber (5), and the threads are sealed with PTFE tape. The test chamber air inlet connector (6) is connected to the mixing tank air outlet connector; The exhaust collection chamber (10) is equipped with a dew point sensor (11), a temperature sensor (12) and a test chamber exhaust port connector (13), and the dew point sensor (11), the temperature sensor (12) and the test chamber exhaust port connector (13) are threadedly connected to the exhaust collection chamber (10), and the threads are sealed with PTFE tape. The exhaust gas collection chamber (10) is installed on the upper reinforcing rib of the equipment housing (1) inside the housing by screws.

5. A water vapor filtration efficiency test bench according to claim 4, characterized in that, The connection surface between the exhaust collection chamber (10) and the intake chamber (5) is provided with a through hole, and a test piece mounting seat (8) is provided around the through hole. The test piece to be tested can be placed on the test piece mounting seat (8).

6. A water vapor filtration efficiency test bench according to claim 3, characterized in that, The outer walls of the humidification water tank (51) and the gas mixing tank (40) are both covered with a heat insulation layer.

7. A water vapor filtration efficiency test bench according to claim 1, characterized in that, A touch screen (2) is installed on the device housing (1).

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