Efficiency calibration device for particulate matter cutter

Abstract

The utility model discloses a particulate matter cutter efficiency calibration device which comprises a machine frame, a mounting cavity is formed in the machine frame, an air inlet pipe is arranged at the upper end of the mounting cavity, an aerosol atomizer is arranged at the upper end of the air inlet pipe, and a dilution air path and a drying device are further connected between the air inlet pipe and the aerosol atomizer. The lower end of the air inlet pipe is connected with an air path shunting joint, a particulate matter cutter and a calibrated total dust concentration detection instrument are fixed in the mounting cavity, at least two shunting pipe joints are arranged on the air path shunting joint, one shunting pipe joint is communicated with an air inlet of the total dust concentration detection instrument, and the other shunting pipe joint is communicated with an air inlet of the particulate matter cutter; an air outlet of the particulate matter cutter is connected with an air outlet pipe, the air outlet pipe is communicated with the vacuumizing power device, the air outlet pipe is further provided with a sampling port, a sampling pipe is arranged in the sampling port, the sampling pipe is connected with a standard particulate matter concentration detection instrument, and the device can quickly and accurately calibrate the cutter.

Description

Technical Field

[0001] This utility model relates to the field of particle cutter calibration technology, and in particular to a particle cutter efficiency calibration device. Background Technology

[0002] A particulate matter cutter is a device that separates particulate matter within a specific vertical range. For example, a PM2.5 particulate matter cutter separates particles with a diameter of 2.5 micrometers or less. Before use, the cutter must be calibrated and set. The cutting efficiency of the cutter is calculated using the formula E. x =C down / C up ×100%, where E x For cutting efficiency; C down C represents the particle concentration downstream of the cutter. up This represents the concentration of particulate matter upstream of the cutter.

[0003] Patent application CN201210056491.2 discloses a calibration system for a particulate matter cutter. This system includes a mixing chamber and a suspension chamber. Particulate matter is placed directly in the mixing chamber, and then two air sources are used to blow it into the mixing chamber to lift and mix the particulate matter. The mixed particulate matter then enters the suspension chamber for further mixing to form a standard gas, which is then used for cutter calibration via a connector. However, this calibration system has the following technical drawbacks:

[0004] 1. The mixed chamber stores particulate matter, which is stirred up by the incoming airflow. This results in a large amount of dust and a high concentration of particulate matter when there is a large amount of particulate matter in the early stage. However, as the particulate matter is gradually used, the concentration of particulate matter is lower and the height of the pile is lower. At this time, the contact area with the airflow is smaller, so the amount of dust is lower. This leads to a large fluctuation in the particulate matter concentration of the discharged standard gas.

[0005] 2. After the standard gas is discharged, a cutter needs to be connected, and during the calibration of the cutter, C down and C up There are several detection methods, among which the most accurate but least efficient method is the membrane filter method. This involves introducing a standard gas into a detection chamber, which is then connected to a cutter on one end and a filter membrane on the other. Particulate matter is filtered out by the membrane, and the membrane is weighed before and after use to obtain the total weight of the filtered particulate matter. Dividing this weight by the pumping volume gives the particulate matter concentration C. up Similarly, the gas downstream of the cutter is filtered through all filter membranes to obtain particulate matter concentration C. down Although this detection method yields accurate results, it is extremely inefficient.

[0006] Another method involves directly detecting particulate matter concentration using two calibrated standard instruments. down and particulate matter concentration C up This greatly improves efficiency. However, in the calibration process described above, the gas extracted from the detection chamber enters the cutter in one path and is connected to the main detection instrument in the other. It is necessary to ensure the consistency of other flow states in these two paths so that the data detected by the main detection instrument can correspond to the particulate matter concentration entering the cutter. However, due to the connection method described above, the gas particulate matter concentration at different locations in the detection chamber is not necessarily completely uniform, and the gas will also experience turbulence during extraction and sampling. Therefore, it is impossible to determine the consistency between the dust-laden gas entering the main detection instrument and the gas entering the cutter in the chamber. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a particulate matter cutter efficiency calibration device, which can quickly and accurately calibrate the cutter, improving efficiency while ensuring the accuracy of the results.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a particulate matter cutter efficiency calibration device, including a frame, an installation chamber on the frame, an air inlet pipe at the upper end of the installation chamber, an aerosol atomizer at the upper end of the air inlet pipe, a dilution gas path and a drying device for drying dust-laden gas connected between the air inlet pipe and the aerosol atomizer, a gas path splitter connector at the lower end of the air inlet pipe, a particulate matter cutter and a calibrated total dust concentration detector fixed in the installation chamber, at least two splitter pipe connectors on the gas path splitter connector, one splitter pipe connector connected to the air inlet of the total dust concentration detector, and the other splitter pipe connector connected to the air inlet of the particulate matter cutter, an air outlet pipe connected to the air outlet of the particulate matter cutter, the air outlet pipe connected to a vacuum power device, a sampling port on the air outlet pipe, a sampling tube inside the sampling port, and a standard particulate matter concentration detector connected to the sampling tube.

[0009] As a preferred embodiment, the drying device includes a drying chamber, the upper end of which is connected to the dust outlet of the aerosol atomizer by a pipe, a partition net is provided in the drying chamber, and drying particles are placed on the partition net, the lower end of the drying chamber is connected to the air inlet pipe, and a dilution port connected to the dilution gas path is provided on the pipe between the drying chamber and the aerosol atomizer.

[0010] As a preferred embodiment, the air inlet pipe is vertically arranged, the drying chamber and the aerosol atomizer are connected by an elbow, and the dilution port is located on the elbow and is vertically arranged.

[0011] As a preferred embodiment, an electric heating wire is also provided inside the air intake pipe.

[0012] As a preferred embodiment, the aerosol atomizer includes an atomizer body, a container cover at the top of the atomizer body, a dust outlet on the atomizer body, a compressed air inlet communicating with compressed air on the atomizer body, a gas supply window on the container cover, and a sealing plate rotatably mounted on the container cover to adjust the size of the gas supply window.

[0013] As a preferred embodiment, the gas path splitter includes a cylindrical connecting pipe section and a flared splitter cone located at the downstream end of the connecting pipe section. An inlet pipe is inserted into the connecting pipe section and fixed by a locking structure. The gas path splitter is located within an installation chamber. A splitter chamber is provided inside the splitter cone. A splitter cone extending axially towards the inlet of the connecting pipe section is provided at the bottom of the splitter cone. The upstream tip of the splitter cone corresponds to the center of the connecting pipe section. A plurality of splitter connection screw holes are evenly distributed around the center circumference of the connecting pipe section at the bottom of the splitter chamber. Two of these splitter connection screw holes are threaded with a splitter pipe connector, while the other splitter connection screw holes communicate with the inner cavity of the installation chamber. An exhaust port is provided within the installation chamber.

[0014] As a preferred embodiment, the flow-diverting cone has flow-guiding grooves on its conical surface that correspond one-to-one with the flow-diverting connecting screw holes. The flow-guiding grooves extend along the conical surface of the flow-diverting cone and are arc-shaped grooves. The arc-shaped contour of the arc-shaped grooves completely coincides with the flow-diverting connecting screw holes.

[0015] As a preferred embodiment, the diversion connection screw hole includes a threaded hole section and a through straight section penetrating the diversion cone. The diameter of the threaded hole section is larger than that of the through straight section, forming a joint positioning step. The locking structure includes a plurality of radial locking screw holes provided on the connecting pipe section. The radial locking screw holes are internally threaded with a tightening bolt that radially tightens the intake pipe.

[0016] As a preferred embodiment, the vent pipe is vertically arranged, the sampling port is provided at the bottom of the vent pipe, the upper end of the sampling tube is inserted into the vent pipe from bottom to top from the sampling port and the sampling port is sealed, and a vacuum port connected to the vacuum power device is provided on the side wall of the vent pipe.

[0017] After adopting the above technical solution, the effect of this utility model is as follows: A particulate matter cutter efficiency calibration device includes a frame, on which an installation chamber is provided. An air inlet pipe is provided at the upper end of the installation chamber, and an aerosol atomizer is provided at the upper end of the air inlet pipe. A dilution gas path and a drying device for drying dust-laden gas are connected between the air inlet pipe and the aerosol atomizer. An air path splitter is connected to the lower end of the air inlet pipe. A particulate matter cutter and a calibrated total dust concentration detector are fixed in the installation chamber. At least two splitter pipe connectors are provided on the air path splitter, one of which is connected to the air inlet of the total dust concentration detector, and the other is connected to the air inlet of the particulate matter cutter. An air outlet pipe is connected to the air outlet of the particulate matter cutter, and the air outlet pipe is connected to a vacuum power device. The system is interconnected, and the outlet pipe is also equipped with a sampling port. A sampling tube is installed inside the sampling port, and the sampling tube is connected to a standard particulate matter concentration detector. Therefore, during calibration, the aerosol atomizer will generate aerosol, which is then diluted by a dilution gas. The dilution gas also provides the power to transport the dust-laden gas. After being dried by the drying device, the dust-laden gas enters the gas path splitter. The gas path splitter is equipped with at least two splitting pipe joints. Since the gas path splitter directly splits the airflow in the inlet pipe, the split gas then enters the particulate matter cutter and the total dust concentration detector respectively. Compared with the method of sampling from the detection chamber, the mutual interference of the split airflow is smaller, resulting in better consistency of the split airflow and more accurate detection results. Furthermore, this calibration device uses standard instruments for detection, which is more efficient.

[0018] Furthermore, since the drying device includes a drying chamber, the upper end of which is connected to the dust outlet of the aerosol atomizer by a pipe, a partition net is installed inside the drying chamber, and drying particles are placed on the partition net, the lower end of the drying chamber is connected to the air inlet pipe, and a dilution port connected to the dilution gas path is provided on the pipe between the drying chamber and the aerosol atomizer. This drying chamber can dry the dust-laden gas, thereby avoiding the influence of humidity on calibration and reducing the adhesion of excessively humid dust-laden gas on the air inlet or outlet pipe.

[0019] Furthermore, since the air inlet pipe is vertically arranged, the drying chamber and the aerosol atomizer are connected by an elbow, and the dilution port is located on the elbow and is vertically arranged, the vertical arrangement of both the air inlet pipe and the dilution port can ensure the straight-line delivery of dust-laden gas as much as possible and reduce the adhesion of particulate matter to the pipe wall.

[0020] Furthermore, since the aerosol atomizer includes an atomizer body, a container cap is provided at the top of the atomizer body, a dust outlet is provided on the atomizer body, a compressed air pipe port communicating with compressed air is provided on the atomizer body, and a gas supply window is provided on the container cap, with a sealing plate rotatably mounted on the container cap to adjust the size of the gas supply window. Therefore, by adjusting the sealing plate, the size of the gas supply window can be adjusted, thereby controlling the amount of air output from the dust outlet and achieving flow rate regulation.

[0021] Furthermore, the gas path splitter includes a cylindrical connecting pipe section and a flared splitter cone located at the downstream end of the connecting pipe section. The inlet pipe is inserted into the connecting pipe section and fixed by a locking structure. The gas path splitter is located in the installation chamber. The splitter cone has a splitter chamber inside. The bottom of the splitter cone has a splitter cone extending axially towards the opening of the connecting pipe section. The upstream tip of the splitter cone corresponds to the center of the connecting pipe section. The bottom of the splitter chamber has several splitter connection screw holes evenly distributed around the center circumference of the connecting pipe section. Two of the splitter connection screw holes are threaded with a splitter pipe connector, and the other splitter connection screw holes communicate with the inner cavity of the installation chamber. An exhaust port is provided in the installation chamber. Because the center of the diversion cone corresponds to the center of the connecting pipe section, the dust-laden airflow is evenly diverted into each diversion connecting screw hole after entering. Since the diversion connecting screw holes are evenly arranged, the state of the dust-laden gas flowing out of each diversion connecting screw hole is consistent. Therefore, the dust-laden gas passing through the particulate matter cutter and the dust-laden gas entering the total dust concentration detection instrument are in the same state, and the particulate matter concentration is also the same. This ensures that the total concentration detection result upstream of the cutter is accurate, making the cutting efficiency calibration or standardization more accurate and with smaller errors.

[0022] Furthermore, the flow-dividing cone has flow-guiding grooves on its conical surface that correspond one-to-one with the flow-dividing connection screw holes. These flow-guiding grooves extend along the conical surface of the flow-dividing cone. This allows gas to enter the flow-dividing connection screw holes more smoothly through the flow-guiding grooves. Moreover, the arc-shaped contour of the grooves perfectly coincides with the flow-dividing connection screw holes, ensuring smooth gas flow and consistent gas flow rate.

[0023] Furthermore, since the splitter connection screw hole includes a threaded hole section and a through straight section penetrating the splitter cone, the diameter of the threaded hole section is larger than that of the through straight section, forming a joint positioning step. This allows the splitter pipe joint to contact the joint positioning step when screwed in, thereby ensuring that the state of each splitter pipe joint is consistent, further guaranteeing consistency. The locking structure includes several radial locking screw holes provided on the connecting pipe section. The radial locking screw holes are internally threaded with tightening bolts that radially tighten the intake pipe. The intake pipe can be tightened by multiple tightening bolts.

[0024] Furthermore, since the exhaust pipe is vertically arranged, the sampling port is located at the bottom of the exhaust pipe, and the upper end of the sampling tube is inserted into the exhaust pipe from bottom to top from the sampling port and the sampling port is sealed. The side wall of the exhaust pipe is provided with a vacuum tube port that is connected to the vacuum power device. In this way, both the sampling tube and the exhaust pipe are vertically arranged, which reduces the adhesion of particulate matter and can also ensure the stability of the gas flow state and reduce the phenomenon of eddies. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0027] Figure 2 This is a front view of an embodiment of the present utility model;

[0028] Figure 3 yes Figure 2 Structural cross-sectional view along AA;

[0029] Figure 4 This is a cross-sectional view of the drying device, air inlet pipe, and air flow divider of an embodiment of this utility model;

[0030] Figure 5 This is a perspective view of the gas flow divider of this utility model embodiment;

[0031] Figure 6 This is a perspective view of the gas flow divider connector of this utility model embodiment from another angle;

[0032] Figure 7 This is a front view of the gas flow divider connector according to an embodiment of this utility model;

[0033] Figure 8 yes Figure 7 Structural cross-sectional view along BB;

[0034] Figure 9 yes Figure 7 Cross-sectional perspective view along CC;

[0035] Figure 10 yes Figure 7 Sectional view along CC;

[0036] Figure 11 This is a schematic diagram of the structure of the aerosol atomizer according to an embodiment of the present invention;

[0037] In the attached diagram: 1. Frame; 2. Mounting chamber; 3. Air inlet pipe; 4. Aerosol atomizer; 41. Atomizer body; 42. Dust outlet; 43. Compressed air inlet; 44. Air supply window; 45. Sealing plate; 5. Drying device; 51. Drying chamber; 52. Separator mesh; 6. Air path splitter connector; 61. Connecting pipe section; 62. Splitting cone; 63. Splitting chamber; 64. Splitting cone; 65. Splitting connection screw hole; 651. Threaded hole section; 652. Through straight section; 653. Joint positioning step; 66. Flow guide groove; 7. Particulate matter cutter; 8. Total dust concentration measuring instrument; 9. Diverter pipe joint; 10. Vacuum pumping power unit; 11. Standard particulate matter concentration measuring instrument; 12. Exhaust pipe; 13. Sampling pipe; 14. Dilution pipe port; 15. Elbow; 16. Exhaust port; 17. Locking structure; 18. Vacuum pumping pipe port. Detailed Implementation

[0038] The present invention will be further described in detail below through specific embodiments.

[0039] like Figure 1-11 As shown, a particulate matter cutter efficiency calibration device includes a frame 1, a mounting chamber 2 on the frame 1, an air inlet pipe 3 at the upper end of the mounting chamber 2, an aerosol atomizer 4 at the upper end of the air inlet pipe 3, a dilution gas path and a drying device 5 for drying dust-laden gas connected between the air inlet pipe 3 and the aerosol atomizer 4, a gas path splitter 6 connected to the lower end of the air inlet pipe 3, a particulate matter cutter 7 and a calibrated total dust concentration detector 8 fixed inside the mounting chamber 2, and a gas... The flow divider 6 is equipped with at least two flow divider connectors 9. One flow divider connector 9 is connected to the air inlet of the total dust concentration detector 8, and the other flow divider connector 9 is connected to the air inlet of the particulate matter cutter 7. The air outlet of the particulate matter cutter 7 is connected to an air outlet pipe 12, which is connected to a vacuum power device 10. A sampling port is also provided on the air outlet pipe 12, and a sampling tube 13 is provided inside the sampling port. The lower end of the sampling tube 13 is connected to a standard particulate matter concentration detector 11.

[0040] In this embodiment, the drying device 5 includes a drying chamber 51. The upper end of the drying chamber 51 is connected to the dust outlet 42 of the aerosol atomizer 4 via a pipe. A partition net 52 is installed inside the drying chamber 51, and drying particles are placed on the partition net 52 (the drying particles are omitted in the attached drawing). The lower end of the drying chamber 51 is connected to the air inlet pipe 3. A dilution port 14, connected to the dilution gas path, is installed on the pipe between the drying chamber 51 and the aerosol atomizer 4. The air inlet pipe 3 is vertically arranged, and the drying chamber 51 and the aerosol atomizer 4 are connected via an elbow 15. The dilution port 14 is located on the elbow 15 and is vertically arranged. An electric heating wire may also be installed inside the air inlet pipe 3.

[0041] In this embodiment, the selected aerosol nebulizer 4 is a medical nebulizer, such as the PARI LC SPRINT nebulizer. The aerosol nebulizer 4 includes a nebulizer body 41, with a container cap at the top, a dust outlet 42, and a compressed air inlet 43 communicating with compressed air. The container cap has a replenishment air window 44, and a sealing plate 55 for adjusting the size of the replenishment air window 44 is rotatably mounted on the container cap. Alternatively, the aerosol nebulizer 4 described in the applicant's patent number CN201721210278.7 can also be used.

[0042] The gas flow divider 6 includes a cylindrical connecting pipe section 61 and a flared diversion cone 62 located at the downstream end of the connecting pipe section 61. The inlet pipe 3 is inserted into the connecting pipe section 61 and fixed by a locking structure. The gas flow divider 6 is located in the installation chamber 2. The diversion cone 62 is provided with a diversion chamber 63. The bottom of the diversion cone 62 is provided with a diversion cone 64 extending axially toward the opening of the connecting pipe section 61. The upstream tip of the diversion cone 64 corresponds to the center of the connecting pipe section 61. The bottom of the diversion chamber 63 is provided with a plurality of diversion connection screw holes 65 evenly distributed around the center circumference of the connecting pipe section 61. At least two of the diversion connection screw holes 65 are threaded with diversion pipe connectors 9, and the other diversion connection screw holes 65 communicate with the inner cavity of the installation chamber 2. The installation chamber 2 is also provided with an exhaust port 16.

[0043] The flow-diverting cone 64 has flow-guiding grooves 66 on its conical surface, each corresponding to a flow-diverting connecting screw hole 65. The flow-guiding grooves 66 extend along the conical surface of the flow-diverting cone 64 and are arc-shaped grooves whose arc-shaped contours completely coincide with the flow-diverting connecting screw holes 65. The flow-diverting connecting screw hole 65 includes a threaded hole section 651 and a through straight section 652 that penetrates the flow-diverting cone 62. The diameter of the threaded hole section 651 is larger than that of the through straight section 652, forming a joint positioning step 653. The locking structure includes several radial locking screw holes provided on the connecting pipe section 61. The radial locking screw holes are internally threaded with a tightening bolt 17 that radially tightens the intake pipe 3. The exhaust pipe 12 is vertically arranged, and a sampling port is provided at the bottom of the exhaust pipe 12. The upper end of the sampling tube 13 is inserted into the exhaust pipe 12 from bottom to top from the sampling port and blocks the sampling port. A vacuum port 18 connected to the vacuum power device 10 is provided on the side wall of the exhaust pipe 12. Some structures are omitted in the attached drawings.

[0044] During calibration, aerosol atomizer 4 generates aerosol, which is then diluted by gas in the dilution gas path. This dilution gas also provides the power to transport the dust-laden gas. The dust-laden gas is dried by the drying particles in drying device 5, and then enters the gas path splitter 6 through inlet pipe 3. The gas path splitter 6 directly splits the airflow in inlet pipe 3. It has two splitter pipe joints 9: one connected to the inlet of total dust concentration detector 8, and the other connected to the inlet of particulate cutter 7. Because the splitter cone 64 corresponds to the center of connecting pipe section 61, the dust-laden airflow is evenly split into each splitter connecting screw hole 65 after entering. Since the splitter connecting screw holes 65 are evenly arranged, each… The dust-laden gas flowing out of each diversion connection screw hole 65 is in the same state. Therefore, the dust-laden gas passing through the particulate cutter 7 and the dust-laden gas entering the total dust concentration detector 8 are in the same state, and the particulate matter concentration is also the same. The diverted gas enters the particulate cutter 7 and the total dust concentration detector 8 respectively. The vacuum power device 10 evacuates the outlet pipe 12 to provide further power for the dust-laden gas. The gas in the particulate cutter 7 enters the outlet pipe 12. The standard particulate matter concentration detector 11 detects the gas in the sampling tube 13. In this application, the mutual interference of the diverted airflow is small, the consistency of the diverted airflow is better, and the detection results are more accurate. Moreover, the total dust concentration detector 8 and the standard particulate matter concentration detector 11 are both standard instruments used for detection, which is more efficient. In addition, according to actual needs, the size of the air supply window 44 can be adjusted at any time by adjusting the position of the sealing plate 55 of the aerosol atomizer 4, thereby controlling the air output of the dust outlet 42 and realizing flow regulation.

[0045] In this embodiment, the vacuum pumping power device 10 is a vacuum pump.

[0046] The pneumatic system, servo motor and other actuators, gear transmission mechanism, and lead screw and nut mechanism mentioned in this embodiment are all current conventional technologies. The 5th edition of the "Mechanical Design Handbook" published in Beijing in April 2008 (5th edition, 28th printing) details the specific structure, principle, and other designs of cylinders, motors, and other transmission mechanisms, which are existing technologies with clear and straightforward structures. The 3rd edition of "Modern Practical Pneumatic Technology" SMC training materials published by Machinery Industry Press on August 1, 2008, details vacuum components, gas circuits, and program control, indicating that the pneumatic structure in this embodiment is also existing technology and clear and straightforward. The book "Motor Drive and Speed ​​Regulation" published by Chemical Industry Press on July 1, 2015, also details motor control and limit switches. Therefore, the circuit and pneumatic connections are clear.

[0047] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A particle cutter efficiency calibration device, comprising a frame, characterized in that: The frame is provided with an installation chamber. An air inlet pipe is provided at the upper end of the installation chamber. An aerosol atomizer is provided at the upper end of the air inlet pipe. A dilution gas path and a drying device for drying the dust-containing gas are also connected between the air inlet pipe and the aerosol atomizer. An air path splitter is connected to the lower end of the air inlet pipe. A particulate cutter and a calibrated total dust concentration detector are fixed in the installation chamber. At least two splitter pipe connectors are provided on the air path splitter. One splitter pipe connector is connected to the air inlet of the total dust concentration detector, and the other splitter pipe connector is connected to the air inlet of the particulate cutter. An air outlet pipe is connected to the air outlet of the particulate cutter. The air outlet pipe is connected to a vacuum power device. A sampling port is also provided on the air outlet pipe. A sampling tube is provided in the sampling port. The sampling tube is connected to a standard particulate concentration detector.

2. The particulate matter cutter efficiency calibration device as described in claim 1, characterized in that: The drying device includes a drying chamber, the upper end of which is connected to the dust outlet of the aerosol atomizer by a pipe, a partition net is installed in the drying chamber and dry particles are placed on the partition net, the lower end of the drying chamber is connected to the air inlet pipe, and a dilution port connected to the dilution gas path is provided on the pipe between the drying chamber and the aerosol atomizer.

3. The particulate matter cutter efficiency calibration device as described in claim 2, characterized in that: The air inlet pipe is vertically arranged, the drying chamber and the aerosol atomizer are connected by an elbow, and the dilution port is located on the elbow and is vertically arranged.

4. The particulate matter cutter efficiency calibration device as described in claim 3, characterized in that: An electric heating wire is also installed inside the air intake pipe.

5. The particulate matter cutter efficiency calibration device as described in claim 1, characterized in that: The aerosol atomizer includes an atomizer body, a container cover at the top of the atomizer body, a dust outlet on the atomizer body, a compressed air pipe port communicating with compressed air on the atomizer body, a gas supply window on the container cover, and a sealing plate rotatably mounted on the container cover to adjust the size of the gas supply window.

6. The particulate matter cutter efficiency calibration device as described in claim 1, characterized in that: The gas path splitter includes a cylindrical connecting pipe section and a flared splitter cone located at the downstream end of the connecting pipe section. An inlet pipe is inserted into the connecting pipe section and fixed by a locking structure. The gas path splitter is located in the installation chamber. The splitter cone has a splitter chamber inside. The bottom of the splitter cone has a splitter cone extending axially towards the opening of the connecting pipe section. The upstream tip of the splitter cone corresponds to the center of the connecting pipe section. The bottom of the splitter chamber has several splitter connection screw holes evenly distributed around the center circumference of the connecting pipe section. Two of the splitter connection screw holes are threaded with a splitter pipe connector, and the other splitter connection screw holes communicate with the inner cavity of the installation chamber. An exhaust port is provided in the installation chamber.

7. The particulate matter cutter efficiency calibration device as described in claim 6, characterized in that: The flow-diverting cone has flow-guiding grooves that correspond one-to-one with the flow-diverting connection screw holes on its conical surface. The flow-guiding grooves extend along the conical surface of the flow-diverting cone and are arc-shaped grooves. The arc-shaped contour of the arc-shaped grooves completely coincides with the flow-diverting connection screw holes.

8. The particulate matter cutter efficiency calibration device as described in claim 7, characterized in that: The diversion connection screw hole includes a threaded hole section and a through straight section that penetrates the diversion cone. The diameter of the threaded hole section is larger than that of the through straight section, forming a joint positioning step. The locking structure includes several radial locking screw holes provided on the connecting pipe section. The radial locking screw holes are internally threaded with a tightening bolt that radially tightens the intake pipe.

9. The particulate matter cutter efficiency calibration device as described in claim 1, characterized in that: The vent pipe is vertically arranged, and the sampling port is provided at the bottom of the vent pipe. The upper end of the sampling tube is inserted into the vent pipe from bottom to top from the sampling port and the sampling port is sealed. A vacuum port connected to the vacuum power device is provided on the side wall of the vent pipe.

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