Air Filter Testing Equipment Based on Aerosol Quantitative Generator

Abstract

The present invention relates to the technical field of aerosol generator equipment, and discloses an air filter testing device based on an aerosol quantitative generator, including a testing box, which serves as the basic component of the overall device for assembling and carrying each processing mechanism and its subordinate structural components. A base is provided at the bottom of the testing box, and an anterior chamber, a conical dispersion chamber, and a posterior chamber are sequentially arranged inside it from the starting end to the terminating end, and each chamber inside it is mutually communicated. By adding and setting up an installation sealing mechanism, when testing the air filter, it can not only prevent it from moving or shaking during the testing process, thereby preventing uneven air flow caused by the instability of the air filter during the testing process, ensuring the accuracy and reliability of the air filter test results and test data, but also the fixing and sealing treatment can prevent air from leaking through unexpected paths, thereby preventing the test data of the air filter from being unbalanced or deviated during the testing process.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and particularly to an air filter testing equipment based on an aerosol quantitative generator. Background Art

[0002] An air filter is a filter, also known as an air filter cartridge, air cleaner, air filter element, etc. It is mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, sterile operating rooms, and various precision operating rooms. During the industrial production process, the air filter is used to filter pollutants such as dust and particulate matter in the air to protect production equipment from damage.

[0003] With the development of industrial technology and the increasing attention to environmental protection, air filters are increasingly widely used in various fields such as industrial equipment, automobiles, and air conditioners. Therefore, it is particularly important to test the filtration performance of air filters. When the existing air filter testing equipment tests an air filter, it can only test the single filtration effect through a gas supply device such as an air pump. Since the air filter and its supporting equipment will be used in different environments, the data and test results obtained by such testing equipment are not comprehensive enough and cannot truly reflect the situation of the air filter in various usage environments and during the usage process. Therefore, those skilled in the art have proposed an air filter testing equipment based on an aerosol quantitative generator to solve the above-mentioned technical problems. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an air filter testing equipment based on an aerosol quantitative generator, which solves the problem that the existing testing equipment cannot truly reflect the situation of the air filter in various usage environments and during the usage process.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An air filter testing equipment based on an aerosol quantitative generator includes

[0006] A test chamber, which is the basic component of the overall device and is used to assemble and carry various processing mechanisms and their subordinate structural components. A base is provided at the bottom of the test chamber, and a front chamber, a conical dispersion chamber, and a rear chamber are sequentially arranged inside it from the starting end to the ending end, and the various chambers inside it are interconnected;

[0007] An aerosol generator, which is arranged in the middle of one side of the test chamber and is used to generate aerosol particles with a specific particle size to simulate the pollutants in the external environment during the use of the air filter. Its particle ejection port is communicated with the inside of the front chamber;

[0008] An installation and sealing mechanism, which is arranged in the middle of the test chamber and is used to install and seal the air filter to be tested;

[0009] A resistance adjustment mechanism, which is arranged on one side of the middle part of the test chamber and is used for adjusting the air flow resistance during the test of the air filter;

[0010] A dry-wet adjustment mechanism, which is arranged near the edge on one side of the top of the test chamber and is used for adjusting the dry-wet degree of the air flow during the test of the air filter;

[0011] A collection and analysis mechanism, which is arranged at the upstream and downstream positions of the air flow inside the test chamber and is used for collecting and analyzing the data of the harmful substance concentration in the gas before and after the air filter filtration.

[0012] Preferably, the installation and sealing mechanism includes an installation groove. An installation groove is opened in the middle of the top of the test chamber. Both sides of the inside of the installation groove are slidably connected with limit sliding seats. The bottom ends of the adjacent sides of the limit sliding seats are rotatably connected with clamping and fixing seats. Inner positioning grooves are opened in the middle of the inner sides of the clamping and fixing seats. A test air filter is arranged inside the two inner positioning grooves. Lifting grooves are opened in the middle of the top ends of the clamping and fixing seats.

[0013] Preferably, the installation and sealing mechanism further includes a closing cover plate. The inner top of the installation groove is provided with a closing cover plate, and the closing cover plate matches the size of the installation groove. Silicone layers are covered on the bottom and side surfaces of the closing cover plate. Pressing plates are fixedly connected to both sides of the middle of the top end of the closing cover plate. Fixing bolts are threadedly connected to both sides of the middle of the pressing plates, and the bottom ends of the fixing bolts respectively extend into the inside of the corresponding positions of the test chamber.

[0014] Preferably, the resistance adjustment mechanism includes an installation position. An installation position is opened near the edge on one side inside the test chamber. A turntable is rotatably connected inside the installation position. Five adjustment seats are arranged in a circular array on the turntable. Flow holes are arranged on the adjustment seats, and the area occupied by the flow holes on each adjustment seat increases in the clockwise direction. Annular gaskets are arranged at the front and rear side edges of the adjustment seats.

[0015] Preferably, the resistance adjustment mechanism further includes an installation cavity. An installation cavity is opened on one side inside the test chamber. A stepping motor is arranged inside the installation cavity. The output end of the stepping motor is connected to the middle of the turntable. A protective cover is arranged on one side of the top of the test chamber.

[0016] Preferably, the dry-wet adjustment mechanism includes an air pump. The air pump is arranged in the upper middle part at the back of the test chamber. An installation box is arranged on one side of the middle rear part of the top of the test chamber. One side of the installation box is communicated with the air supply port of the air pump through a three-way connecting pipe one. The other side of the installation box is communicated with the inside of the front chamber through a three-way connecting pipe two. A three-way solenoid valve one is arranged on the three-way connecting pipe one. A three-way solenoid valve two is arranged on the three-way connecting pipe two.

[0017] Preferably, the dry-wet adjustment mechanism includes a partition board. A partition board is fixedly connected to the middle part inside the installation box. The interior of the installation box is separated into two chambers, namely a drying chamber and a humidifying chamber, by the partition board. A plurality of mounting rods are fixedly connected to one side of the inner wall of the installation box at equal intervals. Heating wires are arranged on the mounting rods. A humidifier is arranged on one side of the top of the installation box. The moisture discharge port of the humidifier is communicated with the interior of the humidifying chamber through a connecting pipe.

[0018] Preferably, the acquisition and analysis mechanism includes an upstream concentration sensor. An upstream concentration sensor is arranged on the top of the inner wall of the front chamber, and a downstream concentration sensor is arranged on the top of the inner wall of the rear chamber.

[0019] Preferably, the acquisition and analysis mechanism further includes an intelligent gateway. An intelligent gateway is arranged on one side of the middle and rear part of the top of the test box, which is used to receive the harmful substance data information transmitted by the upstream concentration sensor and the downstream concentration sensor and analyze it. A display is arranged on one side of the middle and front part of the top of the test box, which is used to display the data information and analysis results after being analyzed by the intelligent gateway.

[0020] Preferably, observation windows are arranged on both sides of the middle part of the front end of the test box. A pressure relief pipe is arranged in the middle of the bottom end of the side of the test box far from the aerosol generator. A control valve is arranged on the pressure relief pipe.

[0021] Working principle: When testing the air filter product, first start the sealing mechanism. The staff opens the closed cover plate in the installation groove. After the closed cover plate is removed and moved away, the staff lifts the clamping and fixing seat in the installation groove upward through the lifting groove on the clamping and fixing seat. While the clamping and fixing seat moves upward, it drives the limit sliding seats on both sides to move upward synchronously in the installation groove. When the clamping and fixing seat reaches the upper position, at this time, the limit sliding seats are at the top positions on both sides of the installation groove. The staff opens the clamping and fixing seat in the combined state, and then installs the test air filter to be tested into the inner positioning groove within the clamping and fixing seat. After the installation in the inner positioning groove is completed, the staff then combines and resets the clamping and fixing seat in the open state and moves it downward, so that the clamping and fixing seat drives the test air filter in its inner positioning groove to move downward synchronously to the position corresponding to the conical dispersion chamber. Then the staff puts the previously removed and moved closed cover plate back to the top of the installation groove for resetting, and then presses the closed cover plate after the top of the installation groove is reset, so that the silicone layer at the bottom of the closed cover plate deforms under pressure, filling and sealing the gap between the closed cover plate and the installation groove, thus ensuring the sealing state during the test inside the test box. Then the staff fixes the closed cover plate in the installation groove through the fixing bolts on the pressing plate, thus completing the installation and sealing treatment of the air filter before the test; After the installation and sealing treatment steps of the air filter before the test are completed, the aerosol generator on the test box is started. The aerosol particles and air generated during the operation of the aerosol generator enter the front chamber, and as the air and aerosol particle capacity injected into the front chamber continuously increases, the air and aerosol particles in the front chamber pass through the conical dispersion chamber and the test air filter in the inner positioning groove in sequence and then enter the rear chamber, thus completing the test treatment of the filtration performance of the test air filter in the inner positioning groove. When it is necessary to adjust the air flow resistance during the test of the test air filter, the resistance adjustment mechanism is started. First, the stepping motor in the installation cavity is powered on and runs. While the rotating shaft of the stepping motor rotates, it drives the turntable in the installation position to rotate synchronously. While the turntable rotates, it drives the respective adjustment seats on it to rotate. While the turntable rotates, the adjustment seat corresponding to the position corresponding to the front chamber also undergoes adjustment and conversion synchronously. While the adjustment seat rotates and changes, the number of flow holes and the ventilation area corresponding to the adjustment seat are also constantly changing, so that the air flow resistance generated when the aerosol particles and air in the front chamber pass through the flow holes on the adjustment seat is also constantly changing. Then the aerosol particles and air after resistance adjustment pass through the conical dispersion chamber and disperse into the test air filter and remain in the rear chamber, thus completing the adjustment treatment of the air flow resistance during the test of the air filter;When it is necessary to adjust the dryness and wetness of the gas during the test of the air filter, the dry-wet adjustment mechanism is activated. When it is necessary to dry the gas entering the front cavity, first, the air pump on the test box injects gas into the installation box through the first three-way connecting pipe. At this time, the first three-way solenoid valve on the first three-way connecting pipe conducts the flow path leading to the drying cavity. Then, the gas input by the air pump enters the drying cavity in the installation box through the first three-way connecting pipe. Then, the heating wire on the installation rod in the installation box is activated to heat and dry the gas entering the drying cavity. At this time, the second three-way solenoid valve on the second three-way connecting pipe conducts the flow path from the drying cavity to the front cavity. After that, the gas after heating and drying is discharged into the front cavity in the test box through the second three-way connecting pipe and mixed with the internal gas to improve the dryness of the gas used in the test. When it is necessary to humidify the gas entering the front cavity, first, the air pump on the test box injects gas into the installation box through the first three-way connecting pipe. At this time, the first three-way solenoid valve on the first three-way connecting pipe conducts the flow path leading to the humidifying cavity. Then, the gas input by the air pump enters the humidifying cavity in the installation box through the first three-way connecting pipe. Then, the humidifier on the installation box is activated to humidify the gas entering the humidifying cavity. At this time, the second three-way solenoid valve on the second three-way connecting pipe conducts the flow path from the humidifying cavity to the front cavity. After that, the gas after humidifying is discharged into the front cavity in the test box through the second three-way connecting pipe and mixed with the internal gas to improve the wetness of the gas used in the test. In this way, the adjustment of the dryness and wetness of the test gas during the air filter test is completed; at the same time, the acquisition and analysis mechanism is activated. The upstream concentration sensor in the front cavity collects the concentration data information of harmful substances in the internal gas, and at the same time, the downstream concentration sensor in the rear cavity also synchronously collects the concentration data information of harmful substances in the gas filtered by the tested air filter. After that, the upstream concentration sensor and the downstream concentration sensor send the information they collect to the intelligent gateway synchronously. After receiving the data information transmitted by the upstream concentration sensor and the downstream concentration sensor, the intelligent gateway analyzes it and generates corresponding analysis results. Finally, the generated analysis information and analysis results are displayed on the display for the staff to compare and view. Finally, after the test is completed, the staff opens the control valve on the pressure relief pipe to discharge the gas remaining in the rear cavity through the pressure relief pipe, so as to complete the acquisition and analysis and comparison of the concentration of harmful substances in the gas before and after the air filter filtration.;

[0022] The present invention provides an air filter test device based on an aerosol quantitative generator. It has the following beneficial effects:

[0023] 1. By adding and setting up an installation sealing mechanism, when testing the air filter, the present invention can not only prevent it from moving or shaking during the test, thus preventing uneven air flow caused by the instability of the air filter during the test, ensuring the accuracy and reliability of the air filter test results and test data, but also the fixing and sealing treatment can prevent air from leaking through unexpected paths, thereby preventing imbalances or deviations in the test data of the air filter during the test. At the same time, the fixing and sealing treatment can also keep the position and state of the air filter consistent during each test. Such an operation helps to obtain repeatable test results and improve the comparability and credibility of the test results.

[0024] 2. By adding and setting up a resistance adjustment mechanism, when testing the air filter, on the one hand, it can simulate the real situation of the air filter under different working environments and usage conditions by changing the resistance under air flow conditions, so that the staff can more accurately evaluate the filtration performance and resistance characteristics of the air filter under various actual working conditions. On the other hand, it can also detect the stability and reliability of the air filter under different resistances, which helps the staff to timely discover potential quality problems of the air filter, make improvements and optimizations in a timely manner, and improve the overall quality of the air filter product.

[0025] 3. By adding and setting up a resistance adjustment mechanism, when conducting the test, according to the air flow requirements and working environment of different equipment or engines, the air flow resistance is adjusted for testing. This can not only provide more specific guidance for the design and selection of air filters. For example, for high-performance engines or equipment working in harsh environments, air filters that can still maintain good filtration performance under high resistance can be selected; while for low-power equipment or systems sensitive to air flow resistance, air filters with smaller resistance can be selected to ensure the normal operation and efficiency of the system. Moreover, appropriately adjusting the resistance can optimize the filtration efficiency of the air filter. Within a certain range, increasing the resistance can improve the filtering ability for fine particles, but at the same time, it will also increase the difficulty of air flow through, resulting in a decrease in intake pressure. By testing to find the best resistance balance point, it is possible to minimize the negative impact on the air system while ensuring the filtration efficiency, improve the intake efficiency and combustion performance of the engine, and thus achieve the purpose of energy conservation and emission reduction.

[0026] 4. By adding and setting a dry-wet adjustment mechanism, when testing the air filter, the humidity of the test gas is adjusted. First, it can simulate the usage performance and filtration effect of the air filter in different environments, thus providing accurate data support for the application of the air filter product in different regions. Second, air with different humidities may carry different types and sizes of particulate pollutants. By adjusting the air humidity for testing, the filtration efficiency of the air filter for various particles at different humidities can be accurately evaluated to ensure that the air filter can effectively remove pollutants in the air in different environments.

[0027] 5. By adding and setting a collection and analysis mechanism, when testing the air filter, this mechanism collects and analyzes the harmful substance concentrations in the upstream and downstream air in the equipment. It can not only accurately calculate the filtration efficiency of the air filter for different types of pollutants, thus providing clear data for users to understand the filtration effect of the air filter in actual use, but also continuously collect and analyze the pollutant content in the upstream and downstream gases during the testing process to monitor the change of the filtration performance of the air filter over time in real time, which helps to discover the performance decay law of the air filter during use and provides a basis for determining a reasonable replacement cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic front-side structure diagram of the present invention;

[0029] Figure 2 is a schematic rear-side structure diagram of the present invention;

[0030] Figure 3 is of the present invention Figure 2 an enlarged schematic diagram of the structure at A of the present invention;

[0031] Figure 4 is a schematic transverse sectional view of the internal structure of the test chamber of the present invention;

[0032] Figure 5 is a schematic longitudinal sectional view of the internal structure of the test chamber of the present invention;

[0033] Figure 6 is a schematic partial structure diagram of the closed cover plate of the present invention;

[0034] Figure 7 is a schematic diagram of the turntable structure of the present invention;

[0035] Figure 8 is a schematic diagram of the internal structure of the installation box of the present invention.

[0036] Among them, 1. Base; 2. Installation groove; 3. Protective cover; 4. Trident connecting pipe 1; 5. Three-way solenoid valve 1; 6. Humidifier; 7. Installation box; 8. Pressure plate; 9. Sealing cover plate; 10. Smart gateway; 11. Control valve; 12. Relief pipe; 13. Display; 14. Observation window; 15. Test box; 16. Aerosol generator; 17. Air pump; 18. Three-way solenoid valve 2; 19. Trident connecting pipe 2; 20. Upstream concentration sensor; 21. Front chamber; 22. Turntable; 23. Stepper motor; 24. Limit sliding seat; 25. Clamping and fixing seat; 26. Rear chamber; 27. Downstream concentration sensor; 28. Conical dispersion chamber; 29. Installation chamber; 30. Lifting groove; 31. Test air filter; 32. Silicone layer; 33. Fixed bolt; 34. Adjusting seat; 35. Flow hole; 36. Annular gasket; 37. Installation position; 38. Partition; 39. Humidification chamber (39); 40. Installation rod; 41. Heating wire; 42. Inner positioning groove. Specific embodiments

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] Please refer to the attached Figure 1 - attached Figure 2 and attached Figure 4 As shown in the drawings, the present invention provides an air filter test device based on an aerosol quantitative generator, including a test box 15, which is used as the basic component of the overall device for assembling and carrying each processing mechanism and its subordinate structural components. A base 1 is provided at the bottom of the test box 15, and a front chamber 21, a conical dispersion chamber 28, and a rear chamber 26 are sequentially arranged inside it from the starting end to the ending end, and the chambers inside it are mutually communicated; an aerosol generator 16 is provided in the middle of one side of the test box 15 for generating aerosol particles with specific particle sizes to simulate pollutants in the external environment during the use of the air filter, and its particle ejection port is communicated with the inside of the front chamber 21;

[0039] When the aerosol generator 16 on the test box 15 is started, the aerosol particles and air generated during the operation of the aerosol generator 16 enter the front chamber 21. As the air and aerosol particle capacity injected into the front chamber 21 continuously increases, the air and aerosol particles in the front chamber 21 sequentially pass through the conical dispersion chamber 28 and the test air filter 31 in the inner positioning groove 42 and then enter the rear chamber 26, thereby completing the test process of the filtering performance of the test air filter 31 in the inner positioning groove 42.

[0040] Please refer to the appendix Figure 5 - Appendix Figure 6 Install a sealing mechanism, which is arranged in the middle of the test chamber 15 and is used for installing and sealing the air filter to be tested.

[0041] The installation and sealing mechanism includes an installation groove 2. An installation groove 2 is opened in the middle of the top end of the test chamber 15. Both sides of the inside of the installation groove 2 are slidably connected with limit sliding seats 24. The bottom ends of the adjacent sides of the limit sliding seats 24 are rotatably connected with clamping and fixing seats 25. Inner positioning grooves 42 are opened in the middle of the inner sides of the clamping and fixing seats 25. A test air filter 31 is arranged within the two inner positioning grooves 42. Lifting grooves 30 are opened in the middle of the top ends of the clamping and fixing seats 25.

[0042] When the installation and sealing mechanism is started, the staff opens the closing cover plate 9 in the installation groove 2. After the closing cover plate 9 is removed and moved away, the staff lifts the clamping and fixing seats 25 in the installation groove 2 upward through the lifting grooves 30 on the clamping and fixing seats 25. While the clamping and fixing seats 25 are moving upward, they drive the limit sliding seats 24 on both sides of them to move upward synchronously in the installation groove 2. After the clamping and fixing seats 25 are lifted in place, at this time, the limit sliding seats 24 are at the top positions on both sides of the installation groove 2. The staff opens the combined clamping and fixing seats 25, and then the staff installs the test air filter 31 to be tested into the inner positioning grooves 42 within the clamping and fixing seats 25. After the installation in the inner positioning grooves 42 is completed, the staff then combines and resets the opened clamping and fixing seats 25 and moves them downward, so that the clamping and fixing seats 25 drive the test air filter 31 within their inner positioning grooves 42 to move downward synchronously to a position corresponding to the conical dispersion chamber 28.

[0043] The installation and sealing mechanism further includes a closing cover plate 9. A closing cover plate 9 is arranged on the inner top of the installation groove 2, and the closing cover plate 9 matches the size of the installation groove 2. Silicone layers 32 are covered on the bottom and side surfaces of the closing cover plate 9. Both sides of the middle of the top end of the closing cover plate 9 are fixedly connected with pressing plates 8. Fixing bolts 33 are threadedly connected to both sides of the middle of the pressing plates 8, and the bottom ends of the fixing bolts 33 respectively extend to the inside of the corresponding positions of the test chamber 15.

[0044] After that, the staff then puts the previously removed and moved-away closing cover plate 9 back to the top of the installation groove 2 for resetting. Then the staff presses the closing cover plate 9 after the top of the installation groove 2 is reset, so that the silicone layer 32 at the bottom of the closing cover plate 9 is deformed under pressure to fill and seal the gap between the closing cover plate 9 and the installation groove 2, thereby ensuring the sealed state during the test inside the test chamber 15. After that, the staff then fixes the closing cover plate 9 in the installation groove 2 through the fixing bolts 33 on the pressing plates 8, thus completing the installation and sealing treatment of the air filter before the test.

[0045] Please refer to the attached Figure 7 , a resistance adjustment mechanism, which is arranged on one side of the middle part of the test chamber 15 and is used for adjusting the air flow resistance during the test of the air filter;

[0046] The resistance adjustment mechanism includes a mounting position 37. A mounting position 37 is provided near the edge on one side inside the test chamber 15. A turntable 22 is rotatably connected in the mounting position 37. Five adjustment seats 34 are circumferentially arranged on the turntable 22. A flow hole 35 is provided on each adjustment seat 34, and the area occupied by the flow hole 35 on each adjustment seat 34 increases in the clockwise direction. Annular gaskets 36 are provided at the front and rear edges of the adjustment seat 34.

[0047] The area occupied by the flow hole 35 on the adjustment seat 34 ranges from 0% at the bottom, that is, the no-resistance state, and then gradually increases to 20%, that is, the state of one flow hole 35, then gradually increases to 40%, that is, the state of two flow holes 35, then gradually increases to 60%, that is, the state of three flow holes 35, and finally gradually increases to 80%, that is, the state of four flow holes 35. As the number of flow holes 35 increases, the area occupied by the flow hole 35 on the adjustment seat 34 also increases. When the gas passes through, the resistance will decrease synchronously. On the contrary, as the area occupied by the flow hole 35 on the adjustment seat 34 decreases, the resistance of the gas will increase synchronously when passing through. By using this resistance adjustment method to detect the filtration situation of the air filter under different gas resistances, the use state and filtration state data of the air filter during on-site use can be more realistically simulated and reflected.

[0048] The resistance adjustment mechanism further includes a mounting cavity 29. A mounting cavity 29 is provided on one side inside the test chamber 15. A stepping motor 23 is arranged in the mounting cavity 29. The output end of the stepping motor 23 is connected to the middle part of the turntable 22. A protective cover 3 is provided on one side of the top of the test chamber 15.

[0049] When the resistance adjustment mechanism is started, first, the stepper motor 23 in the installation cavity 29 is powered on and runs. While the rotating shaft of the stepper motor 23 rotates, it drives the turntable 22 in the installation position 37 to rotate synchronously. While the turntable 22 rotates, it drives each adjustment seat 34 thereon to rotate. While the turntable 22 rotates, the adjustment seat 34 corresponding to the position of the front cavity 21 also undergoes synchronous adjustment and conversion. While the adjustment seat 34 rotates and changes, the number of flow holes 35 and the ventilation area corresponding to the adjustment seat 34 are also constantly changing. As a result, the airflow resistance generated when the aerosol particles and air in the front cavity 21 pass through the flow holes 35 on the adjustment seat 34 is also constantly changing. Then, the aerosol particles and air after resistance adjustment pass through the conical dispersion cavity 28, disperse and penetrate into the test air filter 31, and then remain in the rear cavity 26, thereby completing the adjustment process of the airflow resistance during the air filter test.

[0050] Please refer to the attached Figure 3 and the attached Figure 8 , the dry-wet adjustment mechanism, which is arranged at one side near the edge at the top of the test box 15, is used to adjust the dry-wet degree of the airflow during the air filter test;

[0051] The dry-wet adjustment mechanism includes an air pump 17. The air pump 17 is arranged in the upper middle part at the rear of the test box 15. On one side of the middle rear part at the top of the test box 15, there is an installation box 7. One side of the installation box 7 is connected to the air supply port of the air pump 17 through a three-way connecting pipe one 4. The other side of the installation box 7 is connected to the inside of the front cavity 21 through a three-way connecting pipe two 19. A three-way solenoid valve one 5 is arranged on the three-way connecting pipe one 4, and a three-way solenoid valve two 18 is arranged on the three-way connecting pipe two 19.

[0052] When the dry-wet adjustment mechanism is started, when it is necessary to dry the gas entering the front cavity 21, first, the air pump 17 on the test box 15 injects gas into the installation box 7 through the three-way connecting pipe one 4. At this time, the three-way solenoid valve one 5 on the three-way connecting pipe one 4 conducts the flow path leading to the drying cavity. Then, the gas input by the air pump 17 enters the drying cavity in the installation box 7 through the three-way connecting pipe one 4. Then, the heating wire 41 on the mounting rod 40 in the installation box 7 is started, so as to heat and dry the gas entering the drying cavity. At this time, the three-way solenoid valve two 18 on the three-way connecting pipe two 19 conducts the flow path from the drying cavity to the front cavity 21. After that, the gas after heating and drying is discharged into the front cavity 21 in the test box 15 through the three-way connecting pipe two 19 and mixed with the internal gas therein, thereby improving the dryness of the gas used during the test.

[0053] The dry-wet adjustment mechanism includes a partition plate 38. The middle part inside the installation box 7 is fixedly connected with the partition plate 38. The inside of the installation box 7 is separated into two chambers, namely a drying chamber and a humidifying chamber 39, by the partition plate 38. A plurality of mounting rods 40 are fixedly connected at equal intervals on one side of the inner wall of the installation box 7. Heating wires 41 are arranged on the mounting rods 40. A humidifier 6 is arranged on one side of the top of the installation box 7. The moisture discharge port of the humidifier 6 is communicated with the inside of the humidifying chamber 39 through a connecting pipe.

[0054] When it is necessary to humidify the gas entering the front chamber 21, first, the air pump 17 on the test box 15 injects gas into the installation box 7 through the three-way connecting pipe one 4. At this time, the three-way solenoid valve one 5 on the three-way connecting pipe one 4 conducts the flow path input into the humidifying chamber 39. Then the gas input by the air pump 17 enters the humidifying chamber 39 inside the installation box 7 through the three-way connecting pipe one 4. Then the humidifier 6 on the installation box 7 is started to humidify the gas entering the humidifying chamber 39. At this time, the three-way solenoid valve two 18 on the three-way connecting pipe two 19 conducts the flow path from the humidifying chamber 39 to the front chamber 21. After that, the gas after the humidification treatment is discharged into the front chamber 21 inside the test box 15 through the three-way connecting pipe two 19 and mixed with the internal gas to improve the humidity of the gas used in the test, thereby completing the adjustment of the dry-wet degree of the test gas during the air filter test.

[0055] The collection and analysis mechanism is arranged at the upstream and downstream positions of the air flow inside the test box 15 and is used for collecting and analyzing the harmful substance concentration data in the gas before and after the air filter filtration.

[0056] The collection and analysis mechanism includes an upstream concentration sensor 20. The upstream concentration sensor 20 is arranged at the top of the inner wall of the front chamber 21. The downstream concentration sensor 27 is arranged at the top of the inner wall of the rear chamber 26. An intelligent gateway 10 is arranged on one side of the middle and rear part of the top of the test box 15, which is used for receiving the harmful substance data information transmitted by the upstream concentration sensor 20 and the downstream concentration sensor 27 and analyzing it. A display 13 is arranged on one side of the middle and front part of the top of the test box 15, which is used for displaying the data information and analysis results after being analyzed by the intelligent gateway 10. Observation windows 14 are arranged on both sides of the middle part of the front end of the test box 15. A pressure relief pipe 12 is arranged at the middle part of the bottom of one side of the test box 15 away from the aerosol generator 16. A control valve 11 is arranged on the pressure relief pipe 12.

[0057] When the acquisition and analysis mechanism is started, the upstream concentration sensor 20 in the front chamber 21 collects the concentration data information of harmful substances in the internal gas. At the same time, the downstream concentration sensor 27 in the rear chamber 26 also synchronously collects the concentration data information of harmful substances in the gas filtered by the tested air filter 31. Then, the upstream concentration sensor 20 and the downstream concentration sensor 27 synchronously send the information they collect to the intelligent gateway 10. After receiving the data information transmitted by the upstream concentration sensor 20 and the downstream concentration sensor 27, the intelligent gateway 10 analyzes it and generates corresponding analysis results. Finally, the generated analysis information and analysis results are displayed through the display 13 for the staff to compare and view.

[0058] Finally, after the test is completed, the staff opens the control valve 11 on the pressure relief pipe 12 to discharge the gas remaining in the rear chamber 26 through the pressure relief pipe 12, thereby completing the acquisition, analysis and comparison of the concentration of harmful substances in the gas before and after air filter filtration.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Air filter test equipment based on aerosol quantitative generator, characterized in that: include The test box (15) is a basic component of the whole device, and is used to assemble and carry each processing mechanism and its subordinate structural components. The bottom of the test box (15) is provided with a base (1), and the interior thereof is provided with a front cavity (21), a conical dispersion cavity (28) and a rear cavity (26) in sequence from the starting end to the ending end, and the various cavities inside the test box are interconnected; An aerosol generator (16) is disposed in the middle of one side of the test box (15) and is used to generate aerosol particles of a specific particle size to simulate pollutants in the external environment during the use of the air filter, and its particle ejection port is connected to the interior of the front cavity (21); A sealing mechanism is installed, which is arranged in the middle of the test box (15) and is used to install and seal the air filter to be tested; A resistance adjustment mechanism, which is arranged on one side of the middle part of the test box (15) and is used to adjust the airflow resistance during the air filter test; The resistance adjustment mechanism comprises a mounting position (37), a mounting position (37) is provided near an edge of one side of the interior of the test box (15), a turntable (22) is rotatably connected to the mounting position (37), five adjustment seats (34) are arranged in a circular array on the turntable (22), each of the adjustment seats (34) is provided with a flow hole (35), and the area occupied by the flow hole (35) on each adjustment seat (34) increases in a clockwise direction, and an annular sealing gasket (36) is provided at the front and rear side edges of the adjustment seat (34); The resistance adjustment mechanism further comprises an installation cavity (29), one side of the interior of the test box (15) is provided with the installation cavity (29), a stepping motor (23) is arranged in the installation cavity (29), an output end of the stepping motor (23) is connected to the middle part of the rotating disk (22), and a protective cover (3) is arranged on one side of the top end of the test box (15); A dryness and wetness adjustment mechanism, which is arranged on one side of the top of the test box (15) near the edge, and is used to adjust the dryness and wetness of the airflow during the air filter test; The wet / dry adjustment mechanism comprises an air pump (17), the air pump (17) is arranged at the middle upper part of the rear side of the test box (15), a mounting box (7) is arranged at one side of the middle rear part of the top end of the test box (15), one side of the mounting box (7) is connected to the air supply port of the air pump (17) through a three-pronged connecting pipe (1) (4), and the other side of the mounting box (7) is connected to the interior of the front cavity (21) through a three-pronged connecting pipe (2) (19), a three-way solenoid valve (1) (5) is arranged on the three-pronged connecting pipe (1) (4), and a three-way solenoid valve (2) (18) is arranged on the three-pronged connecting pipe (19); The dry-wet adjustment mechanism comprises a partition (38), the partition (38) is fixedly connected to the middle part of the inner side of the installation box (7), the interior of the installation box (7) is divided into two chambers, a drying chamber and a humidifying chamber (39), by the partition (38), a plurality of installation rods (40) are fixedly connected to one side of the inner wall of the installation box (7) at equal intervals, and the installation rods (40) are all provided with heating wires (41), and a humidifier (6) is provided on one side of the top of the installation box (7), and the moisture outlet of the humidifier (6) is connected to the interior of the humidifying chamber (39) through a connecting pipe; The collection and analysis mechanism is arranged at upstream and downstream positions of the air flow inside the test box (15) and is used to collect and analyze the concentration data of harmful substances in the gas before and after the air filter is filtered.

2. The air filter testing device based on the aerosol quantitative generator according to claim 1, characterized in that: The installation sealing mechanism comprises an installation groove (2), the middle part of the top end of the test box (15) is provided with an installation groove (2), both sides of the inside of the installation groove (2) are slidably connected to a limit sliding seat (24), the bottom end of the adjacent side of the limit sliding seat (24) is rotatably connected to a clamping fixed seat (25), the middle part of the inner side of the clamping fixed seat (25) is provided with an inner positioning groove (42), and a test air filter (31) is arranged in the two inner positioning grooves (42), and the middle part of the top end of the clamping fixed seat (25) is provided with a pulling groove (30).

3. The air filter testing device based on the aerosol quantitative generator according to claim 2, characterized in that: The installation sealing mechanism also includes a closed cover plate (9), the closed cover plate (9) is arranged on the inner top of the installation groove (2), and the closed cover plate (9) matches the size of the installation groove (2), the bottom and side surfaces of the closed cover plate (9) are covered with a silicone layer (32), the top middle of the closed cover plate (9) is fixedly connected to a pressing plate (8) on both sides, the middle of the pressing plate (8) is threadedly connected to fixing bolts (33), and the bottom ends of the fixing bolts (33) extend to the inside of the corresponding positions of the test box (15).

4. The air filter testing device based on the aerosol quantitative generator according to claim 1, characterized in that: The collection and analysis mechanism comprises an upstream concentration sensor (20), the top of the inner wall of the front cavity (21) is provided with the upstream concentration sensor (20), and the top of the inner wall of the rear cavity (26) is provided with a downstream concentration sensor (27).

5. The air filter testing device based on the aerosol quantitative generator according to claim 4, characterized in that: The collection and analysis mechanism further comprises an intelligent gateway (10), which is arranged on one side of the middle rear portion of the top end of the test box (15) and is used to receive harmful substance data information transmitted by the upstream concentration sensor (20) and the downstream concentration sensor (27) and analyze the harmful substance data information, and a display (13) is arranged on one side of the middle front portion of the top end of the test box (15) and is used to display the data information and analysis results analyzed by the intelligent gateway (10).

6. The air filter testing device based on the aerosol quantitative generator according to claim 5, characterized in that: Observation windows (14) are provided on both sides of the middle of the front end of the test box (15), a pressure relief pipe (12) is provided in the middle of the bottom end of the side of the test box (15) away from the aerosol generator (16), and a control valve (11) is provided on the pressure relief pipe (12).

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