Efficiency calibration device for particulate matter cutter

Abstract

The invention discloses a particulate matter cutter efficiency calibration device which comprises a rack, a mounting cavity is formed in the rack, 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 gas circuit 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] The invention relates to the technical field of particle cutter calibration, and in particular to a particle cutter efficiency calibration device. Background Art

[0002] A particle cutter is a device that separates particles within a specific vertical range. For example, a PM2.5 particle cutter separates particles with a diameter less than or equal to 2.5 microns. The cutter must be calibrated and calibrated before use. According to the calculation formula E of the cutter's cutting efficiency x =C down / C up × 100%, where E x is the cutting efficiency; C down is the particle concentration downstream of the cutter, and C up is the particle concentration upstream of the cutter.

[0003] The application document with patent number CN201210056491.2 discloses a calibration system for a particle cutter, which includes a mixing chamber and a suspension chamber. The particles are directly placed in the mixing chamber, and then two gas sources are used to blow into the mixing chamber to lift and mix the particles. The mixed particles then enter the suspension chamber to mix and form a standard gas, which is then used for the calibration of the cutter through a joint. However, the calibration system has the following technical disadvantages:

[0004] 1. Particles are stored in the mixing bin, and the particles are raised by the airflow. This results in a large amount of dust and a high concentration of particles when there are more particles in the early stage. When the particles are gradually used, the particle concentration is lower. At this time, the contact surface with the airflow will be small, so the dust volume is low, which leads to a large fluctuation in the particle concentration of the discharged standard gas.

[0005] 2. After the standard gas is discharged, the cutter needs to be connected, and when the cutter is calibrated, C down and C up There are several ways to detect the particle size. The most accurate but least efficient way is to use the filter membrane method, which is to pass the standard gas into a detection chamber, and then the detection chamber is connected to the cutter on one side and the air is pumped through the filter membrane on the other side. The particles will be filtered by the filter membrane, and finally the filter membrane is weighed to obtain the weight of the filter membrane before and after filtration. The total weight of the filtered particles can be obtained, and then divided by the amount of air pumped to get the particle concentration C up Similarly, all the gases downstream of the cutter are filtered through the membrane to obtain the particle concentration C down Although this detection method is accurate, its efficiency is very low.

[0006] The other method is to directly detect the particle concentration through two calibrated standard detection instruments. down and particle concentration C up , which greatly improves the efficiency. However, in the above calibration process, the gas extracted from the detection chamber enters the cutter one way and is connected to the main detection instrument one way. It is necessary to ensure the consistency of other flow states of these two routes, so that the data detected by the main detection instrument can correspond to the concentration of particles entering the cutter. However, due to the above connection method, the concentration of gas particles at different positions in the detection chamber is not necessarily completely uniform, and the gas will also be turbulent during gas extraction sampling, so it is impossible to determine the consistency of the dust-containing gas in the chamber that enters the main detection instrument and the cutter. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a particle cutter efficiency calibration device, which can quickly and accurately calibrate the cutter, thereby improving efficiency while ensuring the accuracy of the results.

[0008] To solve the above technical problems, the technical solution of the present invention is: a particle cutter efficiency calibration and calibration device, comprising a frame, an installation chamber is arranged on the frame, an air inlet pipe is arranged at the upper end of the installation chamber, an aerosol atomizer is arranged 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 shunt joint is connected to the lower end of the air inlet pipe, a particle cutter and a calibrated total dust concentration detection instrument are fixed in the installation chamber, at least two shunt pipe joints are arranged on the air path shunt joint, one of the shunt pipe joints is connected to the air inlet of the total dust concentration detection instrument, and the other shunt pipe joint is connected to the air inlet of the particle cutter, the air outlet of the particle cutter is connected to an air outlet pipe, the air outlet pipe is connected to a vacuum power device, a sampling port is also arranged on the air outlet pipe, a sampling tube is arranged in the sampling port, and the sampling tube is connected to a sub-standard particle concentration detection instrument.

[0009] As a preferred solution, the drying device includes a drying chamber, a pipe is connected between the upper end of the drying chamber and the dust outlet of the aerosol atomizer, a partition net is arranged in the drying chamber, and the partition net is filled with dry particles, the lower end of the drying chamber is connected to the air inlet pipe, and a dilution pipe mouth connected to the dilution air path is arranged on the pipe between the drying chamber and the aerosol atomizer.

[0010] As a preferred solution, the air inlet pipe is vertically arranged, the drying chamber and the aerosol atomizer are connected via an elbow, and the dilution pipe opening is arranged on the elbow and vertically arranged.

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

[0012] As a preferred solution, the aerosol nebulizer includes an nebulizer body, a container cover is provided at the upper opening of the nebulizer body, a dust outlet is provided on the nebulizer body, a compressed air pipe port connected to compressed air is provided on the nebulizer body, an air supply window is provided on the container cover, and a sealing piece for adjusting the size of the air supply window is rotatably installed on the container cover.

[0013] As a preferred scheme, the air path diverter joint includes a cylindrical connecting pipe section and a diverter cone cylinder arranged at the downstream end of the connecting pipe section in a flared shape, the air inlet pipe is inserted into the connecting pipe section and fixed by a locking structure, the air path diverter joint is located in the installation chamber, a diverter chamber is arranged inside the diverter cone cylinder, a diverter cone extending axially toward the pipe mouth of the connecting pipe section is arranged at the bottom of the diverter cone cylinder, the upstream tip of the diverter cone corresponds to the center of the connecting pipe section, and a plurality of diverter connecting screw holes evenly distributed around the center circumference of the connecting pipe section are arranged at the bottom of the diverter chamber, two of which are threadedly connected to the diverter pipe joints, and the other diverter connecting screw holes are connected to the inner cavity of the installation chamber, and an exhaust port is arranged in the installation chamber.

[0014] As a preferred solution, the conical surface of the diverter cone is provided with a guide groove which is connected to the diverter connection screw hole in a one-to-one correspondence. The guide groove extends along the conical surface of the diverter cone. The guide groove is an arc-shaped groove, and the arc-shaped contour of the arc-shaped groove completely coincides with the diverter connection screw hole.

[0015] As a preferred solution, the diversion connecting screw hole includes a threaded hole section and a straight section passing through the diversion cone, the diameter of the threaded hole section is larger than the straight section to form a joint positioning step, and the locking structure includes a plurality of radial locking screw holes arranged on the connecting pipe section, and the radial locking screw hole is threadedly connected to a tightening bolt that radially tightens the intake pipe.

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

[0017] After adopting the above technical scheme, the effect of the present invention is as follows: a particle cutter efficiency calibration and calibration device includes a frame, an installation chamber is arranged on the frame, an air inlet pipe is arranged at the upper end of the installation chamber, an aerosol atomizer is arranged at the upper end of the air inlet pipe, a dilution air 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 diversion joint is connected to the lower end of the air inlet pipe, a particle cutter and a calibrated total dust concentration detection instrument are fixed in the installation chamber, at least two diversion pipe joints are arranged on the air path diversion joint, one of the diversion pipe joints is connected to the air inlet of the total dust concentration detection instrument, and the other diversion pipe joint is connected to the air inlet of the particle cutter, the air outlet of the particle cutter is connected to the air outlet pipe, and the air outlet pipe is connected to the vacuum power device The air outlet pipe is connected, and 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 particle concentration detection instrument. Therefore, when calibration is performed, the aerosol nebulizer will generate an aerosol, which is then diluted by a diluent gas. The diluent gas also provides a conveying power for the dust-laden gas. The dust-laden gas is dried by a drying device and then enters the air path diversion joint. The air path diversion joint will be provided with at least two diversion pipe joints. Since the air path diversion joint directly diverts the airflow in the air inlet pipe, the diverted gas enters the particle cutter and the total dust concentration detection instrument respectively. Compared with the method of extracting samples in the detection chamber, the mutual interference of the diverted airflow is smaller, so the consistency of the diverted airflow is better, and the detection result is more accurate. In addition, the calibration device uses standard instruments for detection, which is more efficient.

[0018] Furthermore, since the drying device includes a drying chamber, a pipe is connected between the upper end of the drying chamber and the dust outlet of the aerosol atomizer, a partition net is arranged in the drying chamber, and the partition net is filled with dry particles. The lower end of the drying chamber is connected with the air inlet pipe, and a dilution pipe mouth connected with the dilution air path is arranged on the pipe between the drying chamber and the aerosol atomizer. The drying chamber can dry the dust-containing gas, thereby avoiding the influence of humidity on calibration, and can also reduce the adhesion of dust-containing gas with excessive humidity to the air inlet pipe or the air outlet pipe.

[0019] Furthermore, since the air inlet pipe is arranged vertically, the drying chamber and the aerosol atomizer are connected through an elbow, the dilution pipe mouth is arranged on the elbow and is arranged vertically, and the air inlet pipe and the dilution pipe mouth are both arranged vertically, the dust-containing gas can be transported in a straight line as much as possible and the adhesion of particulate matter on the pipe wall can be reduced.

[0020] Furthermore, the aerosol atomizer includes an atomizer body, a container cover is provided at the upper opening of the atomizer body, a dust outlet is provided on the atomizer body, a compressed air pipe port connected to compressed air is provided on the atomizer body, an air replenishment window is provided on the container cover, and a sealing piece for adjusting the size of the air replenishment window is rotatably installed on the container cover. Therefore, the size of the air replenishment window can be adjusted by adjusting the sealing piece, so that the air output of the dust outlet can be controlled to achieve flow adjustment.

[0021] Furthermore, since the air path diverter joint includes a cylindrical connecting pipe section and a diverter cone cylinder arranged at the downstream end of the connecting pipe section in a flared shape, the air inlet pipe is inserted into the connecting pipe section and fixed by a locking structure, the air path diverter joint is located in the installation chamber, and a diverter chamber is arranged inside the diverter cone cylinder, and a diverter cone extending axially toward the pipe mouth of the connecting pipe section is arranged at the bottom of the diverter cone cylinder, and the upstream tip of the diverter cone corresponds to the center of the connecting pipe section, and a plurality of diverter connecting screw holes evenly distributed around the central circumference of the connecting pipe section are arranged at the bottom of the diverter chamber, wherein two of the diverter connecting screw holes are respectively threadedly connected to the diverter pipe joints, and the other diverter connecting screw holes are connected to the inner cavity of the installation chamber, and an exhaust port is arranged in the installation chamber. Since the diverter cone corresponds to the center of the connecting pipe section, the dust-laden airflow will be evenly diverted by the diverter cone to each diverter connecting screw hole after entering, and the diverter connecting screw holes are evenly arranged, so the state of the dust-laden gas flowing out of each diverter connecting screw hole is consistent. Therefore, the state of the dust-laden gas passing through the particle cutter and the dust-laden gas entering the total dust concentration detection instrument are consistent, and the particle concentration is also the same, so that the total concentration detection result upstream of the cutter can be guaranteed to be accurate, so that the cutting efficiency calibration or calibration will be more accurate and the error will be smaller.

[0022] Furthermore, since the conical surface of the diverter cone is provided with a flow guiding groove corresponding to the diverter connection screw hole, and the flow guiding groove extends along the conical surface of the diverter cone, the gas can enter the diverter connection screw hole more smoothly through the flow guiding groove, and the arc-shaped contour of the arc-shaped groove completely overlaps with the diverter connection screw hole, which can ensure the smoothness of the gas and the consistency of the gas flow.

[0023] Furthermore, since the flow-dividing connection screw hole includes a threaded hole section and a straight section that passes through the flow-dividing cone, the threaded hole section has a diameter larger than the straight section to form a joint positioning step, so that the flow-dividing pipe joint can contact the joint positioning step when screwed in, thereby ensuring that the state of each flow-dividing pipe joint is also consistent, thereby further ensuring consistency. The locking structure includes a plurality of radial locking screw holes arranged on the connecting pipe section, and the radial locking screw holes are threadedly connected with a tightening bolt that radially tightens the intake pipe, and the intake pipe can be tightened by a plurality of tightening bolts.

[0024] Furthermore, since the air outlet pipe is vertically arranged, the sampling port is arranged at the bottom of the air outlet pipe, the upper end of the sampling tube is inserted into the air outlet pipe from the bottom to the top of the sampling port and blocks the sampling port, and a vacuum pipe port connected to a vacuum power device is arranged on the side wall of the air outlet pipe. In this way, the sampling tube and the air outlet pipe are both 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 vortex. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 is a stereogram of an embodiment of the present invention;

[0027] Figure 2 is a front view of an embodiment of the present invention;

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

[0029] Figure 4 is a cross-sectional view of a drying device, an air inlet pipe and an air path flow splitter joint according to an embodiment of the present invention;

[0030] Figure 5 is a stereoscopic diagram of a gas path flow splitter joint according to an embodiment of the present invention;

[0031] Figure 6 is a three-dimensional diagram of the gas path flow splitter joint from another angle according to an embodiment of the present invention;

[0032] Figure 7 2 is a front view of a gas path flow splitter joint according to an embodiment of the present invention;

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

[0034] Fig. 9 yes Figure 7 A cross-sectional perspective view along CC;

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

[0036] Fig.11 Schematic diagram of the structure of an aerosol nebulizer according to an embodiment of the present invention;

[0037] In the attached figure: 1. rack; 2. installation chamber; 3. air inlet pipe; 4. aerosol atomizer; 41. atomizer body; 42. dust outlet; 43. compressed air pipe port; 44. air supply window; 45. blocking piece; 5. drying device; 51. drying chamber; 52. separation net; 6. air path diversion joint; 61. connecting pipe section; 62. diversion cone; 63. diversion chamber; 64. diversion cone; 65. diversion connection screw hole; 651. Threaded hole section; 652. Through straight section; 653. Joint positioning step; 66. Diversion groove; 7. Particle cutter; 8. Total dust concentration detection instrument; 9. Diversion pipe joint; 10. Vacuum power device; 11. Standard particle concentration detection instrument; 12. Exhaust pipe; 13. Sampling tube; 14. Dilution pipe mouth; 15. Elbow; 16. Exhaust port; 17. Locking structure; 18. Vacuum pipe mouth. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below through specific examples.

[0039] like Figure 1-11 As shown, a particle cutter efficiency calibration and calibration device comprises a frame 1, a mounting chamber 2 is arranged on the frame 1, an air inlet pipe 3 is arranged at the upper end of the mounting chamber 2, an aerosol atomizer 4 is arranged at the upper end of the air inlet pipe 3, a dilution air path and a drying device 5 for drying dust-containing gas are connected between the air inlet pipe 3 and the aerosol atomizer 4, an air path diversion joint 6 is connected to the lower end of the air inlet pipe 3, a particle cutter 7 and a calibrated total dust concentration detection instrument 8 are fixed in the mounting chamber 2, and the air At least two shunt pipe joints 9 are arranged on the road shunt joint 6, one of which is connected to the air inlet of the total dust concentration detection instrument 8, and the other is connected to the air inlet of the particle cutter 7. The air outlet of the particle cutter 7 is connected to an air outlet pipe 12, and the air outlet pipe 12 is connected to the vacuum power device 10. A sampling port is also arranged on the air outlet pipe 12, and a sampling tube 13 is arranged in the sampling port. The lower end of the sampling tube 13 is connected to a standard particle concentration detection instrument 11.

[0040] In this embodiment, the drying device 5 includes a drying chamber 51, and a pipe is connected between the upper end of the drying chamber 51 and the dust outlet 42 of the aerosol atomizer 4. A partition net 52 is arranged in the drying chamber 51, and the partition net 52 is filled with dry particles. In the accompanying drawings, the dry particles are omitted and not drawn. The lower end of the drying chamber 51 is connected to the air inlet pipe 3, and a dilution nozzle 14 connected to the dilution gas path is arranged on the pipe between the drying chamber 51 and the aerosol atomizer 4. The air inlet pipe 3 is arranged vertically, and the drying chamber 51 and the aerosol atomizer 4 are connected through an elbow 15. The dilution nozzle 14 is arranged on the elbow 15 and is arranged vertically. An electric heating wire can also be arranged in the air inlet pipe 3.

[0041] In this embodiment, the selected aerosol nebulizer 4 is a medical nebulizer, such as a PARI LC SPRINT sprayer. The aerosol nebulizer 4 includes an aerosol body 41, the upper opening of the aerosol body 41 is provided with a container cover, the aerosol body 41 is provided with a dust outlet 42, the aerosol body 41 is provided with a compressed air pipe 43 connected to the compressed air, the container cover is provided with an air replenishment window 44, and the container cover is also rotatably installed with a blocking piece 55 for adjusting the size of the air replenishment window 44. Of course, the aerosol nebulizer 4 can also use the aerosol nebulizer 4 of the applicant in patent number CN201721210278.7.

[0042] The gas path diverter joint 6 includes a cylindrical connecting pipe section 61 and a diverter cone 62 which is arranged at the downstream end of the connecting pipe section 61 in an expanded shape. The air inlet pipe 3 is inserted into the connecting pipe section 61 and fixed by a locking structure. The gas path diverter joint 6 is located in the installation chamber 2. A diverter chamber 63 is arranged inside the diverter cone 62. A diverter cone 64 extending axially toward the pipe mouth of the connecting pipe section 61 is arranged at the bottom of the diverter cone 62. The upstream tip of the diverter cone 64 corresponds to the center of the connecting pipe section 61. A plurality of diverter connecting screw holes 65 evenly distributed around the central circumference of the connecting pipe section 61 are arranged at the bottom of the diverter chamber 63, wherein at least two of the diverter connecting screw holes 65 are respectively threadedly connected to the diverter pipe joints 9, and the other diverter connecting screw holes 65 are connected to the inner cavity of the installation chamber 2. The installation chamber 2 is also provided with an exhaust port 16.

[0043] The conical surface of the diverter cone 64 is provided with a flow guide groove 66 corresponding to the diverter connection screw hole 65. The flow guide groove 66 extends along the conical surface of the diverter cone 64. The flow guide groove 66 is an arc-shaped groove, and the arc profile of the arc-shaped groove completely coincides with the diverter connection screw hole 65. The diverter connection screw hole 65 includes a threaded hole section 651 and a through straight section 652 that passes through the diverter cone 62. The diameter of the threaded hole section 651 is larger than the through straight section 652 to form a joint positioning step 653. The locking structure includes a plurality of radial locking screw holes provided on the connecting pipe section 61. The radial locking screw holes are threadedly connected with a tightening bolt 17 that radially tightens the intake pipe 3. The outlet pipe 12 is vertically arranged, and a sampling port is arranged at the bottom of the outlet pipe 12. The upper end of the sampling pipe 13 is inserted into the outlet pipe 12 from the bottom to the top and blocks the sampling port. A vacuum pipe port 18 connected to the vacuum power device 10 is arranged on the side wall of the outlet pipe 12. Some structures are omitted in the drawings.

[0044] During the calibration and use process, the aerosol atomizer 4 generates an aerosol, which is then diluted by the gas in the dilution gas path. The dilution gas also provides a conveying force for the dust-containing gas. The dust-containing gas is dried by the drying particles of the drying device 5, and after drying, it enters the gas path diversion joint 6 through the air inlet pipe 3. The gas path diversion joint 6 directly diverts the airflow in the air inlet pipe 3. The gas path diversion joint 6 is provided with two diversion pipe joints 9, one of which is connected to the air inlet of the total dust concentration detection instrument 8, and the other is connected to the air inlet of the particle cutter 7. Since the diversion cone 64 corresponds to the center of the connecting pipe section 61, the dust-containing airflow is evenly diverted by the diversion cone 64 into each diversion connecting screw hole 65 after entering, and the diversion connecting screw holes 65 are evenly arranged, so that each The state of the dust-containing gas flowing out of each shunt connection screw hole 65 is consistent. Therefore, the state of the dust-containing gas passing through the particle cutter 7 and the dust-containing gas entering the total dust concentration detection instrument 8 is consistent, and the particle concentration is also the same. The shunted gas enters the particle cutter 7 and the total dust concentration detection instrument 8 respectively. The vacuum power device 10 evacuates the air outlet pipe 12 to further provide power for the dust-containing gas. The gas in the particle cutter 7 enters the air outlet pipe 12. The standard particle concentration detection instrument 11 detects the gas in the sampling tube 13. In this application, the mutual interference of the divided airflows is small, the consistency of the divided airflows is better, and the detection results are more accurate. In addition, the total dust concentration detection instrument 8 and the standard particle concentration detection instrument 11 used are both standard instruments for detection, which is more efficient. In addition, according to actual needs, the size of the air replenishment window 44 can be adjusted at any time by adjusting the position of the sealing piece 55 of the aerosol nebulizer 4, so that the air outlet volume of the dust outlet 42 can be controlled to achieve flow regulation.

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

[0046] The gas circuit system, actuators such as servo motors, gear transmission mechanisms, and lead screw nut mechanisms mentioned in this embodiment are all current conventional technologies. The specific structures and principles and other designs of cylinders, motors, and other transmission mechanisms are disclosed in detail in the "Mechanical Design Manual, Fifth Edition", the 28th printing of the fifth edition in Beijing in April 2008, which belongs to the prior art and its structure is clear. The SMC training textbook "Modern Practical Pneumatic Technology, 3rd Edition" published by the Machinery Industry Press on August 1, 2008 discloses vacuum components, gas circuits, and program control in detail, indicating that the gas circuit structure in this embodiment is also an existing technology and is clear. The book "Motor Drive and Speed ​​Regulation" published by the Chemical Industry Press on July 1, 2015 also introduces the control of the motor and the travel switch in detail. Therefore, the circuit and gas circuit connections are clear.

[0047] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A particle cutter efficiency calibration device, comprising a frame, characterized in that: The frame is provided with an installation chamber, the upper end of the installation chamber is provided with an air inlet pipe, the upper end of the air inlet pipe is provided with an aerosol atomizer, a dilution air circuit and a drying device for drying dust-containing gas are also connected between the air inlet pipe and the aerosol atomizer, the lower end of the air inlet pipe is connected with an air path diversion joint, a particle cutter and a calibrated total dust concentration detection instrument are fixed in the installation chamber, at least two diversion pipe joints are provided on the air path diversion joint, one of the diversion pipe joints is connected to the air inlet of the total dust concentration detection instrument, and the other diversion pipe joint is connected to the air inlet of the particle cutter, the air outlet of the particle cutter is connected with an air outlet pipe, 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, and the sampling tube is connected to a standard particle concentration detection instrument.

2. A particle cutter efficiency calibration device as claimed in claim 1, characterized in that: The drying device includes a drying chamber, a pipe is connected between the upper end of the drying chamber and the dust outlet of the aerosol atomizer, a partition net is arranged in the drying chamber, and the partition net is filled with dry particles, the lower end of the drying chamber is connected to the air inlet pipe, and a dilution pipe mouth connected to the dilution air path is arranged on the pipe between the drying chamber and the aerosol atomizer.

3. A particle cutter efficiency calibration device as claimed in claim 2, characterized in that: The air inlet pipe is arranged vertically, the drying chamber and the aerosol atomizer are connected through an elbow, and the dilution pipe mouth is arranged on the elbow and arranged vertically.

4. A particle cutter efficiency calibration device as claimed in claim 3, characterized in that: An electric heating wire is also arranged in the air intake pipe.

5. A particle cutter efficiency calibration device as claimed in claim 1, characterized in that: The aerosol atomizer comprises an atomizer body, a container cover is arranged at the upper opening of the atomizer body, a dust outlet is arranged on the atomizer body, a compressed air pipe port connected with compressed air is arranged on the atomizer body, an air replenishment window is arranged on the container cover, and a sealing piece for adjusting the size of the air replenishment window is rotatably installed on the container cover.

6. A particle cutter efficiency calibration device as claimed in claim 1, characterized in that: The air path diverter joint includes a cylindrical connecting pipe section and a diverter cone cylinder arranged at the downstream end of the connecting pipe section in a flared shape. The air inlet pipe is inserted into the connecting pipe section and fixed by a locking structure. The air path diverter joint is located in the installation chamber. A diverter chamber is arranged inside the diverter cone cylinder. A diverter cone extending axially toward the pipe mouth of the connecting pipe section is arranged at the bottom of the diverter cone cylinder. The upstream tip of the diverter cone corresponds to the center of the connecting pipe section. A plurality of diverter connecting screw holes evenly distributed around the central circumference of the connecting pipe section are arranged at the bottom of the diverter chamber, two of which are threadedly connected to the diverter pipe joints, and the other diverter connecting screw holes are connected to the inner cavity of the installation chamber. An exhaust port is arranged in the installation chamber.

7. A particle cutter efficiency calibration device as claimed in claim 6, characterized in that: The conical surface of the diverter cone is provided with a guide groove which is connected with the diverter connection screw hole in a one-to-one correspondence. The guide groove extends along the conical surface of the diverter cone. The guide groove is an arc-shaped groove, and the arc profile of the arc-shaped groove completely coincides with the diverter connection screw hole.

8. A particle cutter efficiency calibration device as claimed in claim 7, characterized in that: The diversion connecting screw hole includes a threaded hole section and a straight section passing through the diversion cone. The diameter of the threaded hole section is larger than the straight section to form a joint positioning step. The locking structure includes a plurality of radial locking screw holes arranged on the connecting pipe section. The radial locking screw hole is threadedly connected to a tightening bolt that radially tightens the intake pipe.

9. A particle cutter efficiency calibration device as claimed in claim 1, characterized in that: The air outlet pipe is arranged vertically, the sampling port is arranged at the bottom of the air outlet pipe, the upper end of the sampling tube is inserted into the air outlet pipe from bottom to top from the sampling port and blocks the sampling port, and a vacuum pipe port connected to a vacuum power device is arranged on the side wall of the air outlet pipe.

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