Air filter test equipment based on aerosol quantitative generator

Abstract

The invention relates to the technical field of aerosol generator equipment, and discloses an air filter test device based on an aerosol quantitative generator, which comprises a test box as a basic component of the whole device and used for assembling and bearing each processing mechanism and a subordinate lower structural member thereof, and a base is arranged at the bottom of the test box. A front cavity, a conical dispersion cavity and a rear cavity are sequentially arranged in the device from the starting end to the terminating end, and all the cavities in the device are communicated with one another. By adding and arranging the sealing mechanism, when the air filter is tested, the air filter can be prevented from moving or shaking in the testing process, so that the situation that air flows unevenly due to the fact that the air filter is unstable in the testing process is prevented, and the accuracy and reliability of air filter testing results and testing data are guaranteed; and moreover, air can be prevented from leaking from an unexpected path through fixing and sealing treatment, so that the conditions of unbalance or deviation and the like of test data in the test process of the air filter are prevented.

Description

Technical Field

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

[0002] Air filter is a kind of filter, also called air filter cartridge, air filter, style, etc. It is mainly used for air filtration in engineering locomotives, automobiles, agricultural locomotives, laboratories, sterile operating rooms and various precision operating rooms. In the industrial production process, air filter elements are 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 paid to environmental protection, air filters are being used more and more widely in various industrial equipment, automobiles, air conditioners and other fields. Therefore, it is particularly important to test the filtering performance of air filters. Existing air filter testing equipment can only test a single filtering effect through air supply equipment such as an air pump when testing air filters. Since air filters and their supporting equipment will be used in different environments, the data and test results tested by this type of testing equipment are not comprehensive enough and cannot truly reflect the conditions of air filters in various usage environments and during use. Therefore, technical personnel in this field 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 in the prior art, the present invention provides an air filter testing device based on an aerosol quantitative generator, which solves the problem that the prior testing device cannot truly reflect the conditions of the air filter element in various use environments and during use.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an air filter test device based on an aerosol quantitative generator, comprising:

[0006] The test box, as the basic component of the whole device, is used to assemble and carry each processing mechanism and its subordinate structural parts. A base is provided at the bottom of the test box, and a front cavity, a conical dispersion cavity and a rear cavity are sequentially provided inside the test box from the starting end to the ending end, and each cavity inside the test box is connected to each other;

[0007] An aerosol generator is disposed in the middle of one side of the test box, 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;

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

[0009] The resistance adjustment mechanism is arranged on one side of the middle part of the test box and is used to adjust the air flow resistance during the air filter test;

[0010] The dryness and wetness adjustment mechanism is arranged on one side of the top of the test box near the edge, and is used to adjust the dryness and wetness of the airflow during the air filter test;

[0011] The collection and analysis mechanism is arranged at the upstream and downstream positions of the air flow inside the test box, and is used to collect and analyze the concentration data of harmful substances in the gas before and after the air filter is filtered.

[0012] Preferably, the installation sealing mechanism includes an installation groove, a installation groove is opened in the middle of the top of the test box, both sides of the inside of the installation groove are slidably connected with a limiting sliding seat, the bottom end of the adjacent side of the limiting sliding seat is rotatably connected with a clamping fixed seat, an inner positioning groove is opened in the middle of the inner side of the clamping fixed seat, and a test air filter is arranged in the two inner positioning grooves, and a pulling groove is opened in the middle of the top of the clamping fixed seat.

[0013] Preferably, the installation sealing mechanism also includes a closing cover plate, which is arranged on the inner top of the installation groove and matches the size of the installation groove, and the bottom and side surfaces of the closing cover plate are covered with a silicone layer, and pressure plates are fixedly connected to both sides of the middle of the top end of the closing cover plate, and fixing bolts are threadedly connected to both sides of the middle of the pressure plate, and the bottom ends of the fixing bolts extend to the inside of the corresponding positions of the test box respectively.

[0014] Preferably, the resistance adjustment mechanism includes a mounting position, and a mounting position is opened near the edge of one side of the interior of the test box. A turntable is rotatably connected in the mounting position, and there are five adjustment seats in a circular array on the turntable. The adjustment seats are all provided with flow holes, and the area occupied by the flow holes on each adjustment seat increases in a clockwise direction. Annular sealing gaskets are provided at the front and rear side edges of the adjustment seats.

[0015] Preferably, the resistance adjustment mechanism also includes an installation cavity, an installation cavity is opened on one side of the interior of the test box, a stepper motor is arranged in the installation cavity, an output end of the stepper motor is connected to the middle of the turntable, and a protective cover is arranged on one side of the top of the test box.

[0016] Preferably, the wet-dry adjustment mechanism includes an air pump, an air pump is arranged in the middle and upper part of the rear side of the test box, an installation box is arranged on one side of the middle and rear part of the top of the test box, one side of the installation box is connected with the air supply port of the air pump through three-pronged connecting pipe 1, and the other side of the installation box is connected with the interior of the front cavity through three-pronged connecting pipe 2, three-way solenoid valve 1 is arranged on three-pronged connecting pipe 1, and three-way solenoid valve 2 is arranged on three-pronged connecting pipe 2.

[0017] Preferably, the dry-wet regulating mechanism includes a partition, which is fixedly connected to the middle part of the inner side of the installation box, and the interior of the installation box is divided into two chambers, a drying chamber and a humidifying chamber, by the partition. A plurality of installation rods are fixedly connected to one side of the inner wall of the installation box at equal intervals, and heating wires are provided on the installation rods. A humidifier is provided on one side of the top of the installation box, and the moisture outlet of the humidifier is connected to the interior of the humidifying chamber through a connecting pipe.

[0018] Preferably, the collection and analysis mechanism includes an upstream concentration sensor, the top of the front cavity inner wall is provided with the upstream concentration sensor, and the top of the rear cavity inner wall is provided with a downstream concentration sensor.

[0019] Preferably, the collection and analysis mechanism also includes an intelligent gateway. The 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. The 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 the analysis by the intelligent gateway.

[0020] Preferably, observation windows are provided on both sides of the middle of the front end of the test box, a pressure relief pipe is provided in the middle of the bottom end of the side of the test box away from the aerosol generator, and a control valve is provided on the pressure relief pipe.

[0021] Working principle: When testing the air filter product, first install the sealing mechanism and start it. The staff will open the closed cover in the installation groove. After the closed cover is removed, the staff will lift the clamping seat in the installation groove upward through the lifting groove on the clamping seat. While the clamping seat moves upward, it drives the limit sliding seats on both sides to move upward synchronously in the installation groove. After the clamping seat moves up to the position, the limit sliding seats are at the top position on both sides of the installation groove. The staff will open the clamping seat in the combined state, and then the staff will install the test air filter to be tested into the inner positioning groove in the clamping seat. After the inner positioning groove is installed, the staff The operator then merges 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 the positioning groove thereof to move synchronously downward to the position corresponding to the conical dispersion chamber, and then the operator puts the previously removed closed cover plate into the top of the installation groove for reset, and then the operator 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 is deformed under pressure, and the gap between the closed cover plate and the installation groove is filled and sealed, thereby ensuring the sealing state of the test box during the test, and then the operator fixes the closed cover plate in the installation groove by the fixing bolts on the pressure plate to complete the air filter. The installation and sealing of the air filter before the test; after the air filter completes the installation and sealing steps before the test, the aerosol generator on the test box is started, and the aerosol particles and air generated by the aerosol generator when working enter the front cavity, and as the air and aerosol particle capacity injected into the front cavity continues to increase, the air and aerosol particles in the front cavity successively pass through the conical dispersion cavity and the test air filter in the inner positioning groove and enter the rear cavity, thereby completing the test processing 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 air filter, the resistance adjustment mechanism is started, and the stepper motor in the cavity is first installed and powered on. The rotating shaft of the stepper motor drives the rotating disk in the installation position to rotate synchronously while rotating, and the rotating disk drives each adjustment seat thereon to rotate while rotating. While the rotating disk is rotating, the adjustment seat at the corresponding position of the front cavity is also adjusted and converted synchronously. While the adjustment seat is rotating and changing, the number of flow holes and the ventilation area corresponding to the adjustment seat are also constantly changing, so that the airflow resistance generated by the aerosol particles and air in the front cavity when passing through the flow holes on the adjustment seat is also constantly changing, and then the aerosol particles and air after the resistance adjustment are dispersed through the conical dispersion cavity to penetrate into the test air filter and remain in the rear cavity, thereby completing the adjustment of the airflow resistance during the air filter test;When it is necessary to adjust the dryness and wetness of the gas during the air filter test, the dryness and wetness adjustment mechanism is started. When it is necessary to dry the gas entering the front chamber, first, the air pump on the test box injects gas into the installation box through the three-pronged connecting pipe 1. At this time, the three-way solenoid valve 1 on the three-pronged connecting pipe 1 conducts the flow channel input into the drying chamber, and then the gas input by the air pump enters the drying chamber in the installation box through the three-pronged connecting pipe 1. Then the heating wire on the installation rod in the installation box is started, so as to heat and dry the gas entering the drying chamber. At this time, the three-way solenoid valve 2 on the three-pronged connecting pipe 2 connects the drying chamber to The flow channel in the front chamber is conducted, and then the gas after heating and drying is discharged into the front chamber in the test box through the three-pronged connecting pipe 2 to mix with the internal gas, thereby improving the dryness of the gas used in the test. When it is necessary to humidify the gas entering the front chamber, first, the air pump on the test box injects gas into the installation box through the three-pronged connecting pipe 1. At this time, the three-way solenoid valve 1 on the three-pronged connecting pipe 1 conducts the flow channel input into the humidification chamber, and then the gas input by the air pump enters the humidification chamber in the installation box through the three-pronged connecting pipe 1, and then the humidifier on the installation box is started, so that the gas entering the humidification chamber The gas in the cavity is humidified. At this time, the three-way solenoid valve 2 on the three-way connecting pipe 2 conducts the flow channel from the humidification cavity to the front cavity. Then, the gas after the humidification treatment is discharged into the front cavity in the test box through the three-way connecting pipe 2 to mix with the gas inside it, thereby increasing the humidity of the gas used in the test, thereby completing the adjustment of the dryness and wetness of the test gas during the air filter test; at the same time, the collection and analysis mechanism is started, and the upstream concentration sensor in the front cavity collects the data information of the concentration of harmful substances in the gas inside it, and at the same time, the downstream concentration sensor in the rear cavity also synchronously collects the harmful substances in the gas after being filtered by the test air filter. The concentration data information of the substance is collected, and then the upstream concentration sensor and the downstream concentration sensor synchronously send the collected information to the intelligent gateway. 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 to the staff through the display for comparison and viewing. Finally, after the test is completed, the staff opens the control valve on the pressure relief pipe to discharge the gas retained in the rear cavity through the pressure relief pipe, thereby completing the collection 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 testing device based on an aerosol quantitative generator. It has the following beneficial effects:

[0023] 1. The present invention increases and sets a sealing mechanism, which can prevent the air filter from moving or shaking during the test, thereby preventing the air filter from being unstable during the test and causing uneven air flow, thereby ensuring the accuracy and reliability of the air filter test results and test data. In addition, the fixing and sealing process can prevent air from leaking from unexpected paths, thereby preventing the air filter from being unbalanced or deviated during the test. At the same time, the fixing and sealing process can also keep the position and state of the air filter consistent during each test. This operation helps to obtain repeatable test results and improve the comparability and credibility of the test results.

[0024] 2. The present invention increases and sets a resistance adjustment mechanism. When testing the air filter, on the one hand, it can change the resistance under air flow conditions to simulate the actual conditions of the air filter under different working environments and usage conditions, so that the staff can more accurately evaluate the filtering 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 promptly discover potential quality problems of the air filter, make improvements and optimizations in a timely manner, and improve the quality of the overall air filter product.

[0025] 3. The present invention increases and sets a resistance adjustment mechanism. When testing, the air flow resistance is adjusted according to the air flow requirements and working environment of different equipment or engines. 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, an air filter that can still maintain good filtering performance under high resistance can be selected; and for low-power equipment or systems that are sensitive to air flow resistance, an air filter with less resistance can be selected to ensure the normal operation and efficiency of the system. In addition, the proper adjustment of resistance can optimize the filtering efficiency of the air filter. Within a certain range, increasing resistance can improve the filtering capacity of tiny particles, but it will also increase the difficulty of air flow passing through, resulting in a decrease in intake pressure. By testing to find the best resistance balance point, the negative impact on the air system can be minimized while ensuring the filtering efficiency, and the intake efficiency and combustion performance of the engine can be improved, thereby achieving the purpose of energy saving and reducing emissions.

[0026] 4. The present invention increases and sets a dryness and wetness adjustment mechanism to adjust the dryness and wetness of the test gas when testing the air filter. Firstly, it can simulate the performance and filtering effect of the air filter in different environments, thereby providing accurate data support for the application of air filter products in different regions. Secondly, air with different humidity may carry particulate pollutants of different types and sizes. By adjusting the air humidity for testing, the filtering efficiency of the air filter for various particles at different humidity can be accurately evaluated, ensuring that the air filter can effectively remove pollutants in the air in different environments.

[0027] 5. The present invention adds and sets a collection and analysis mechanism. When testing the air filter, the mechanism collects and analyzes the concentration of harmful substances in the upstream and downstream air of the equipment. It can not only accurately calculate the filtration efficiency of the air filter for different types of pollutants, thereby providing users with clear data to understand the filtration effect of the air filter in actual use, but also continuously collects and analyzes the pollutant content of the upstream and downstream gases during the test, and can monitor in real time how the filtration performance of the air filter changes over time, thereby helping to discover the performance attenuation law of the air filter during use and providing a basis for determining a reasonable replacement cycle. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0031] Figure 4 It is a transverse cross-sectional schematic diagram of the internal structure of the test box of the present invention;

[0032] Figure 5 It is a longitudinal cross-sectional schematic diagram of the internal structure of the test box of the present invention;

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

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

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

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

[0037] The following will be combined with the drawings of the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Please see attached Figure 1 - Attachment Figure 2 and attached Figure 4 The embodiment of the present invention provides an air filter test device based on an aerosol quantitative generator, including a test box 15, which is used as a basic component of the overall device and is used to assemble and carry various processing mechanisms and their subordinate structural parts. 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 are mutually connected; an aerosol generator 16, which is arranged in the middle of one side of the test box 15, 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 with the interior of the front cavity 21;

[0039] When the aerosol generator 16 on the test box 15 is started, the aerosol particles and air generated by the aerosol generator 16 during operation enter the front chamber 21, and as the volume of air and aerosol particles injected into the front chamber 21 continues to increase, the air and aerosol particles in the front chamber 21 pass through the conical dispersion chamber 28 and the test air filter 31 in the inner positioning groove 42 in turn and enter the rear chamber 26, thereby completing the test processing of the filtering performance of the test air filter 31 in the inner positioning groove 42.

[0040] Please refer to the attached Figure 5 - Attachment Figure 6 , installing a sealing mechanism, which is arranged in the middle of the test box 15, for installing and sealing the air filter to be tested;

[0041] The installation sealing mechanism includes an installation groove 2. The middle part of the top 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 with a limited sliding seat 24. The bottom end of the adjacent side of the limited sliding seat 24 is rotatably connected with 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. A test air filter 31 is arranged in the two inner positioning grooves 42. The middle part of the top of the clamping fixed seat 25 is provided with a pulling groove 30.

[0042] When the installation sealing mechanism is started, the staff opens the closed cover plate 9 in the installation groove 2. After the closed cover plate 9 is removed and removed, the staff lifts the clamping and fixing seat 25 in the installation groove 2 upward through the lifting groove 30 on the clamping and fixing seat 25. The clamping and fixing seat 25 drives the limiting sliding seats 24 on both sides to move up synchronously in the installation groove 2. After the clamping and fixing seat 25 moves up to the position, the limiting sliding seats 24 are at the top positions on both sides of the installation groove 2. The staff opens the clamping and fixing seat 25 in the combined state, and then the staff installs the test air filter 31 to be tested into the inner positioning groove 42 in the clamping and fixing seat 25. After the inner positioning groove 42 is installed, the staff merges and resets the clamping and fixing seat 25 in the opened state, and moves it down, so that the clamping and fixing seat 25 drives the test air filter 31 in its inner positioning groove 42 to move down synchronously to the position corresponding to the conical dispersion chamber 28.

[0043] The installation sealing mechanism also includes a closed cover plate 9, which is arranged on the inner top of the installation groove 2 and 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. Both sides of the middle of the top of the closed cover plate 9 are fixedly connected with a pressing plate 8, and both sides of the middle of the pressing plate 8 are threadedly connected with 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 respectively.

[0044] Afterwards, the staff puts the previously removed closed cover plate 9 into the top of the installation groove 2 for reset, and then presses the closed cover plate 9 after the top of the installation groove 2 is reset, so that the silicone layer 32 at the bottom of the closed cover plate 9 is deformed by pressure, and the gap between the closed cover plate 9 and the installation groove 2 is filled and sealed, thereby ensuring the sealing state of the test box 15 during the internal test, and then the staff fixes the closed cover plate 9 in the installation groove 2 by the fixing bolts 33 on the pressure plate 8, thereby completing the installation and sealing 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 box 15, and is used to adjust the airflow resistance during the air filter test;

[0046] The resistance adjustment mechanism includes a mounting position 37. A mounting position 37 is provided near the edge of one side of the interior of the test box 15. A turntable 22 is rotatably connected to the mounting position 37. There are five adjustment seats 34 in a circular array on the turntable 22. The adjustment seats 34 are all provided with flow holes 35, and the area occupied by the flow holes 35 on each adjustment seat 34 increases in a clockwise direction. Annular sealing gaskets 36 are provided at the front and rear side edges of the adjustment seats 34.

[0047] The area occupied by the flow holes 35 on the adjustment seat 34 increases from 0% at the bottom, that is, the state of no resistance, to 20%, that is, the state of one flow hole 35, and then gradually increases to 40%, that is, the state of two flow holes 35, and 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 holes 35 on the adjustment seat 34 also increases, and the resistance will be reduced synchronously when the gas passes through. Conversely, as the area occupied by the flow holes 35 on the adjustment seat 34 decreases, the resistance will be increased synchronously when the gas passes through. By using this resistance adjustment method to detect the filtration condition of the air filter under different gas resistances, the use status and filtration status data of the air filter during on-site use can be more realistically simulated and reflected.

[0048] The resistance adjustment mechanism also includes an installation cavity 29 . An installation cavity 29 is opened on one side of the interior of the test box 15 . A stepper motor 23 is arranged in the installation cavity 29 . The output end of the stepper motor 23 is connected to the middle of the turntable 22 . A protective cover 3 is arranged on one side of the top of the test box 15 .

[0049] When the resistance adjustment mechanism is started, first, the stepper motor 23 in the installation cavity 29 is powered on and operated. The rotating shaft of the stepper motor 23 drives the turntable 22 in the installation position 37 to rotate synchronously while rotating. The turntable 22 drives each adjustment seat 34 thereon to rotate while rotating. While the turntable 22 rotates, the adjustment seat 34 at the corresponding position of the front cavity 21 is also adjusted and converted synchronously. While the adjustment seat 34 is rotating and changing, the number of corresponding flow holes 35 and the ventilation area on the adjustment seat 34 are also constantly changing, so that the aerosol particles and air in the front cavity 21 generate airflow resistance when passing through the flow holes 35 on the adjustment seat 34, and then the aerosol particles and air after resistance adjustment are dispersed and penetrated into the test air filter 31 through the conical dispersion cavity 28 and retained in the rear cavity 26, thereby completing the adjustment of the airflow resistance during the air filter test.

[0050] Please see attached Figure 3 and attached Figure 8 , 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;

[0051] The dry-wet adjustment mechanism includes an air pump 17. The air pump 17 is arranged in the middle and upper part of the rear side of the test box 15. An installation box 7 is arranged on one side of the middle and rear part of the top of the test box 15. One side of the installation box 7 is connected with the air supply port of the air pump 17 through a three-pronged connecting pipe 14, and the other side of the installation box 7 is connected with the interior of the front cavity 21 through a three-pronged connecting pipe 2 19. A three-way solenoid valve 15 is arranged on the three-pronged connecting pipe 14, and a three-way solenoid valve 2 18 is arranged on the three-pronged connecting pipe 2 19.

[0052] When the dry-wet adjustment mechanism is started, when it is necessary to dry 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-pronged connecting pipe 14. At this time, the three-way solenoid valve 15 on the three-pronged connecting pipe 14 conducts the flow channel input into the drying chamber, and then the gas input by the air pump 17 enters the drying chamber in the installation box 7 through the three-pronged connecting pipe 14. Then, the heating wire 41 on the installation rod 40 in the installation box 7 is started, so as to heat and dry the gas entering the drying chamber. At this time, the three-way solenoid valve 18 on the three-pronged connecting pipe 19 conducts the flow channel from the drying chamber to the front chamber 21. Then, the gas after heating and drying is discharged into the front chamber 21 in the test box 15 through the three-pronged connecting pipe 19 to mix with the internal gas, thereby improving the dryness of the gas used during the test.

[0053] The dry and wet regulating mechanism includes a partition 38, and 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 at equal intervals to one side of the inner wall of the installation box 7, and heating wires 41 are provided on the installation rods 40. 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.

[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-pronged connecting pipe 14. At this time, the three-way solenoid valve 15 on the three-pronged connecting pipe 14 conducts the flow channel input into the humidification chamber 39, and then the gas input by the air pump 17 enters the humidification chamber 39 in the installation box 7 through the three-pronged connecting pipe 14. Then, the humidifier 6 on the installation box 7 is started, so as to humidify the gas entering the humidification chamber 39. At this time, the three-way solenoid valve 18 on the three-pronged connecting pipe 19 conducts the flow channel from the humidification chamber 39 to the front chamber 21. After that, the gas after the humidification treatment is completed is discharged into the front chamber 21 in the test box 15 through the three-pronged connecting pipe 19 to mix with the internal gas therein, thereby improving the humidity of the gas used during the test, thereby completing the adjustment of the dryness and wetness 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 to collect and analyze the concentration data of harmful substances in the gas before and after the air filter is filtered.

[0056] The collection and analysis mechanism includes an upstream concentration sensor 20, an upstream concentration sensor 20 is arranged on the top of the inner wall of the front cavity 21, and a downstream concentration sensor 27 is arranged on the top of the inner wall of the rear cavity 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 to receive the harmful substance data information transmitted by the upstream concentration sensor 20 and the downstream concentration sensor 27, and analyze 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 to display the data information and analysis results after the analysis by the intelligent gateway 10 is completed. Observation windows 14 are arranged on both sides of the middle part of the front end of the test box 15, and a pressure relief pipe 12 is arranged 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 arranged on the pressure relief pipe 12.

[0057] When the collection and analysis mechanism is started, the upstream concentration sensor 20 in the front cavity 21 collects data information on the concentration of harmful substances in the internal gas thereof, and at the same time, the downstream concentration sensor 27 in the rear cavity 26 also synchronously collects data information on the concentration of harmful substances in the internal gas after filtering by the test air filter 31. Then, the upstream concentration sensor 20 and the downstream concentration sensor 27 synchronously send the collected information 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 the data information and generates corresponding analysis results. Finally, the analysis information and analysis results generated by the intelligent gateway are displayed to the staff for comparison and viewing through the display 13.

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

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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; 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 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 resistance adjustment mechanism comprises a mounting position (37). The mounting position (37) is provided near the 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). The adjustment seats (34) are each provided with a flow hole (35). The area occupied by the flow hole (35) on each adjustment seat (34) increases in a clockwise direction. Annular sealing pads (36) are each provided at the front and rear side edges of the adjustment seat (34).

5. The air filter testing device based on the aerosol quantitative generator according to claim 4, characterized in that: 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 turntable (22), and a protective cover (3) is arranged on one side of the top end of the test box (15).

6. The air filter testing device based on the aerosol quantitative generator according to claim 1, characterized in that: The wet / dry adjustment mechanism comprises an air pump (17), the air pump (17) being arranged at the middle upper part of the rear side of the test box (15), a mounting box (7) being 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) being connected to the air supply port of the air pump (17) via a three-pronged connecting pipe (1) (4), the other side of the mounting box (7) being connected to the interior of the front cavity (21) via a three-pronged connecting pipe (2) (19), a three-way solenoid valve (1) (5) being arranged on the three-pronged connecting pipe (1) (4), and a three-way solenoid valve (2) (18) being arranged on the three-pronged connecting pipe (2) (19).

7. The air filter testing device based on the aerosol quantitative generator according to claim 6, characterized in that: 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 each provided with a heating wire (41), 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.

8. 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).

9. The air filter testing device based on the aerosol quantitative generator according to claim 8, 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).

10. The air filter testing device based on the aerosol quantitative generator according to claim 9, 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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