An aerosol particle sizer

Abstract

An aerosol particle size classifier, comprising a base plate and a particle size classifier body, the base plate is provided with a lifting structure, the lifting structure is provided with an adjusting structure, and the particle size classifier body is arranged on the adjusting structure; the aerosol particle size classifier is characterized in that: through the adjusting structure, rotary motion is converted into specific periodic rotation of the rotating block, and then through the cooperation of the abutting block and the spring, the movable plate generates controllable high-frequency reciprocating motion; the reciprocating motion is further transmitted to the particle size classifier body, forming a frequency-adjustable online mechanical vibration field. The vibration field can exert directional kinetic energy on aerosol particles in the transport process. When the vibration frequency and the inherent frequency of the soft agglomerate match, resonance effect will be induced, and critical shear stress sufficient to overcome van der Waals force will be generated in the agglomerate, thereby realizing in-situ and online deagglomeration of the soft agglomerate. This effectively avoids the problem of particle size misjudgment caused by particle agglomeration.

Description

Technical Field

[0001] This utility model relates to the field of aerosol classification technology, specifically to an aerosol particle size classifier. Background Technology

[0002] In aerosol particle size classification, a parallel approach combining a virtual impactor sampler and an inertial impactor sampler is employed primarily to collaboratively address the efficient separation and collection of particles across a wide particle size range. The virtual impactor sampler, based on the principle of virtual impact, propels airflow through an accelerating nozzle into a stagnant or low-velocity zone near the collection orifice. The inertia of the particles causes them to detach from the main airflow and enter the secondary flow, thus achieving the separation of coarse particles (typically larger than 2.5 micrometers). Its advantage lies in avoiding particle rebound and secondary entrainment on the impact plate, making it particularly suitable for the non-destructive collection of soluble or brittle particles. The inertial impactor sampler, on the other hand, relies on the inertial effect of particles impacting the impact plate in a high-speed airflow. Through a multi-stage series design, it separates particles of different sizes step-by-step, offering high-resolution classification capabilities for fine particles (such as PM2.5 and below). However, its accuracy may be affected by particle rebound or overload. The parallel operation of the two components allows for complementary optimization: the virtual impactor prioritizes the retention of coarse-mode particles, reducing the load and particle loss of subsequent inertial impact stages, while the inertial impactor performs high-precision classification of fine-mode particles, thus covering the complete particle size spectrum from submicron to hundreds of micrometers. This parallel structure enhances the sampler's ability to characterize complex aerosol systems, enabling more accurate reflection of the physicochemical properties and health effects of particulate matter in fields such as environmental monitoring, toxicology research, and source apportionment.

[0003] In current aerosol particle size classification technology, submicron to micron-sized particles are prone to forming soft aggregates during transport through physical interactions such as van der Waals forces. This aggregation behavior leads to an increase in the apparent particle size of originally dispersed fine particles, which is then misjudged by the instrument as a single particle with a larger diameter, seriously interfering with the accuracy of the classification results and the authenticity of the physical characterization. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide an aerosol particle size classifier.

[0005] The technical solution adopted in this utility model is as follows: An aerosol particle size classifier includes a base plate and a particle size classifier body. The base plate is provided with a lifting structure, and the lifting structure is provided with an adjustment structure. The particle size classifier body is disposed on the adjustment structure. The adjustment structure includes a fixed frame, a movable frame is movably disposed on the fixed frame, a spring is provided on the movable frame and the spring is connected to the fixed frame, a movable plate is provided on the movable frame, an abutment block is provided on the movable plate, a rotating plate is movably disposed on the fixed frame, a rotating block is movably disposed on the rotating plate, and a driving assembly is provided on the fixed frame.

[0006] Preferably, the base plate is provided with support feet.

[0007] Preferably, the drive assembly includes a first pulley and a first motor. The first pulley is mounted on the rotating plate, the first motor is mounted on the fixed frame, the drive end of the first motor is provided with a second pulley, and the first pulley and the second pulley are provided with a transmission belt.

[0008] Preferably, the first motor is fixed to the mounting bracket by bolts.

[0009] Preferably, the lifting structure includes a guide rod and a rotating shaft. The guide rod is mounted on the base plate, and the rotating shaft is movably mounted on the base plate. A lifting plate is movably mounted on the guide rod, and a rotating plate is mounted on the rotating shaft. A connecting rod is movably mounted on the rotating plate and is movably connected to the lifting plate. A second motor is mounted on the base plate, and the driving end of the second motor is connected to the rotating shaft. A sleeve is mounted on the base plate, and a transmission rod is movably mounted inside the sleeve and is connected to the lifting plate. A locking hole is provided on the transmission rod, and a locking rod is movably mounted on the sleeve and abuts against the locking hole.

[0010] Preferably, the guide rod is provided in multiple parts.

[0011] Preferably, the sleeve is adapted to the transmission rod.

[0012] Preferably, the card hole is adapted to the card rod.

[0013] The beneficial effects of this invention are as follows: As an aerosol particle size classifier, this invention, through structural adjustment and the coordinated action of a first motor, pulley, and transmission belt, precisely transforms rotational motion into specific periodic rotation of the rotating block. Furthermore, through the cooperation of the abutment block and spring, the moving plate generates controllable high-frequency reciprocating motion. This reciprocating motion is further transmitted to the particle size classifier body, forming an online mechanical vibration field with adjustable frequency. This vibration field can apply directional kinetic energy to the aerosol particles during transport. When the vibration frequency matches the natural frequency of the soft agglomerates, a resonance effect is induced, generating a critical shear stress within the agglomerates sufficient to overcome van der Waals forces, thereby achieving in-situ, online deagglomeration of the soft agglomerates. This approach effectively avoids particle size misjudgment caused by particle agglomeration, significantly improving the resolution and accuracy of particle size classification. It plays a crucial role, especially in maintaining the true dispersion state of submicron and micron-sized particles during measurement, thus providing a more reliable data foundation for subsequent particulate matter chemical analysis, source apportionment, and health effect assessment. Through a lifting structure, a second motor drives the rotating shaft, and a crank-slider mechanism consisting of a rotating plate and connecting rod converts the rotational motion into linear motion of the lifting plate. Guide rods ensure the stability and verticality of the lifting process, thereby achieving precise and controllable adjustment of the particle size classifier's height. The transmission rod rises accordingly. The lowering plate moves synchronously within the sleeve, providing structural support against bending moment and eccentric load. After being raised and lowered to the predetermined operating height, a rigid mechanical interlock is formed by inserting the locking rod into the sleeve side wall and embedding it into the locking hole of the transmission rod. This effectively suppresses the displacement and vibration that may occur when the lifting plate is in operation or under external disturbances, ensuring the high stability and position repeatability of the particle size classifier during the sampling process. This not only significantly improves the adaptability of the equipment to different operating scenarios and personnel operating habits, but also avoids sampling airflow disturbance or particle size classification deviation caused by height instability, providing reliable mechanical protection for long-term continuous monitoring and high-precision classification tasks. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 This is a schematic diagram of the structure of an aerosol particle size classifier according to the present invention; Figure 2 This is a schematic diagram of the structure of an aerosol particle size classifier according to this utility model from another perspective; Figure 3 This is a schematic diagram of the mating structure of the moving plate and the abutment block of an aerosol particle size classifier according to the present invention. In the diagram: 1. Base plate, 2. Fixed frame, 3. Moving frame, 4. Spring, 5. Moving plate, 6. Abutment block, 7. Rotating plate, 8. Rotating block, 9. First pulley, 10. First motor, 11. Second pulley, 12. Transmission belt, 13. Guide rod, 14. Lifting plate, 15. Rotating shaft, 16. Second motor, 17. Rotating plate, 18. Connecting rod, 19. Sleeve, 20. Transmission rod, 21. Clamping hole, 22. Clamping rod, 23. Particle size classifier body. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] The following is combined Figure 1-3This invention describes a specific embodiment of an aerosol particle size classifier, comprising a base plate 1 and a particle size classifier body 23. The base plate 1 has a lifting structure, and the lifting structure has an adjusting structure. The particle size classifier body 23 is mounted on the adjusting structure. The adjusting structure includes a fixed frame 2, a movable frame 3 movably mounted on the fixed frame 2, a spring 4 mounted on the movable frame 3 and connected to the fixed frame 2, a movable plate 5 mounted on the movable frame 3, and an abutment block 6 mounted on the movable plate 5. A rotating plate 7 movably mounts on the fixed frame 2, and a rotating block 8 movably mounts on the rotating plate 7. The fixed frame 2 is equipped with a driving assembly, and the particle size classifier body 23 is mounted on the movable frame 3. Under the action of the spring 4, the movable frame 3 will not detach when moving on the fixed frame 2. The spring 4 can cause the abutment block 6 to abut against the rotating block 8. When the particle size classifier body 23 needs to move back and forth, the rotating plate 7 can rotate on the fixed frame 2. The rotating plate 7 can drive the rotating block 8 to rotate. The abutment block 6 on the movable plate 5 drives the movable plate 5 to move back and forth under the action of the rotating block 8. The movable frame 3 can move back and forth on the fixed frame 2. The spring 4 can cause the abutment block 6 to abut against the rotating block 8. By applying mechanical vibration of a specific frequency, kinetic energy is transferred to the particles. When the vibration frequency matches the natural frequency of the agglomerates, resonance will occur, generating sufficient shear force to deagglomerate the agglomerates online, thus achieving better classification.

[0019] Advantageously, the base plate 1 is provided with support feet, which can make the base plate 1 more stable.

[0020] Advantageously, the drive assembly includes a first pulley 9 and a first motor 10. The first pulley 9 is mounted on the rotating plate 7, and the first motor 10 is mounted on the fixed frame 2. The drive end of the first motor 10 is provided with a second pulley 11. The first pulley 9 and the second pulley 11 are provided with a transmission belt 12 to drive the first motor 10. The first motor 10 can drive the second pulley 11 to rotate, the second pulley 11 can drive the transmission belt 12 to rotate, and the transmission belt 12 can drive the first pulley 9 to rotate.

[0021] Advantageously, the first motor 10 is fixed to the mounting bracket 2 by bolts, which facilitates the installation and removal of the first motor 10 on the mounting bracket 2. Advantageously, the lifting structure includes a guide rod 13 and a rotating shaft 15. The guide rod 13 is mounted on the base plate 1, and the rotating shaft 15 is movably mounted on the base plate 1. A lifting plate 14 is movably mounted on the guide rod 13, and a rotating plate 17 is mounted on the rotating shaft 15. A connecting rod 18 is movably mounted on the rotating plate 17 and is movably connected to the lifting plate 14. A second motor 16 is mounted on the base plate 1, and the driving end of the second motor 16 is connected to the rotating shaft 15. A sleeve 19 is mounted on the base plate 1, and a transmission rod 20 is movably mounted inside the sleeve 19 and is connected to the lifting plate 14. A locking hole 21 is provided on the transmission rod 20, and a locking rod 22 is movably mounted on the sleeve 19 and is connected to the lifting plate 14. The sleeve 19, transmission rod 20, and locking rod 22 are each provided in pairs and symmetrically arranged. The fixing frame 2 is installed on the lifting plate 14. When it is necessary to adjust the height of the particle size classifier body 23 for easy operation, the second motor 16 is driven. The second motor 16 can drive the rotating shaft 15 to rotate. The rotating shaft 15 can drive the rotating plate 17 to rotate. The rotating plate 17 can drive the connecting rod 18 to move. The connecting rod 18 can drive the lifting plate 14 to move on the guide rod 13, thereby adjusting the height of the particle size classifier body 23. When the lifting plate 14 moves, the transmission rod 20 can follow it and move inside the sleeve 19. After the lifting plate 14 moves to the predetermined position, the locking rod 22 passes through the side wall of the sleeve 19 and enters the locking hole 21 on the transmission rod 20 to fix and limit the lifting plate 14.

[0022] Advantageously, there are several guide rods 13, and four guide rods 13 are arranged symmetrically in pairs on the base plate 1.

[0023] Advantageously, the sleeve 19 is adapted to the transmission rod 20, and the adapted transmission rod 20 moves stably within the sleeve 19.

[0024] Advantageously, the locking hole 21 is adapted to the locking rod 22, and the adapted locking rod 22 is more stable within the locking hole 21.

[0025] Working principle of this utility model: First, when the particle size classifier body 23 needs to move back and forth, the first motor 10 is driven. The first motor 10 can drive the second pulley 11 to rotate, the second pulley 11 can drive the transmission belt 12 to rotate, the transmission belt 12 can drive the first pulley 9 to rotate, the rotating plate 7 can rotate on the fixed frame 2, the rotating plate 7 can drive the rotating block 8 to rotate, the abutting block 6 on the moving plate 5 drives the moving plate 5 to move back and forth under the action of the rotating block 8, the moving frame 3 can move back and forth on the fixed frame 2, and the spring 4 can make the abutting block 6 abut against the rotating block 8. By applying mechanical vibration of a specific frequency, kinetic energy is transferred to the particles. When the vibration frequency matches the natural frequency of the agglomerates, resonance occurs, generating sufficient shear force to deagglomerate the agglomerates online, thus improving classification. When it is necessary to adjust the height of the particle size classifier body 23 for easy operation, the second motor 16 is driven. The second motor 16 drives the rotating shaft 15 to rotate, which in turn drives the rotating plate 17 to rotate. The rotating plate 17 drives the connecting rod 18 to move, which in turn drives the lifting plate 14 to move on the guide rod 13. This allows for adjustment of the height of the particle size classifier body 23. When the lifting plate 14 moves, the transmission rod 20 moves with it within the sleeve 19. After the lifting plate 14 moves to the predetermined position, the locking rod 22 passes through the side wall of the sleeve 19 and enters the locking hole 21 on the transmission rod 20 to fix and limit the lifting plate 14.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. An aerosol particle size classifier, comprising a base plate and a particle size classifier body, characterized in that, The base plate is provided with a lifting structure, and the lifting structure is provided with an adjustment structure. The particle size classifier body is disposed on the adjustment structure. The adjustment structure includes a fixed frame, a movable frame is movably disposed on the fixed frame, a spring is disposed on the movable frame and the spring is connected to the fixed frame, a movable plate is disposed on the movable frame, an abutment block is disposed on the movable plate, a rotating plate is movably disposed on the fixed frame, a rotating block is movably disposed on the rotating plate, and a drive assembly is disposed on the fixed frame.

2. The aerosol particle size classifier according to claim 1, characterized in that, The base plate is equipped with support feet.

3. An aerosol particle size classifier according to claim 1, characterized in that, The drive assembly includes a first pulley and a first motor. The first pulley is mounted on the rotating plate, and the first motor is mounted on the fixed frame. The drive end of the first motor is provided with a second pulley, and a transmission belt is provided on the first pulley and the second pulley.

4. An aerosol particle size classifier according to claim 3, characterized in that, The first motor is fixed to the mounting bracket by bolts.

5. An aerosol particle size classifier according to claim 1, characterized in that, The lifting structure includes a guide rod and a rotating shaft. The guide rod is mounted on the base plate, and the rotating shaft is movably mounted on the base plate. A lifting plate is movably mounted on the guide rod, and a rotating plate is mounted on the rotating shaft. A connecting rod is movably mounted on the rotating plate and is movably connected to the lifting plate. A second motor is mounted on the base plate, and the drive end of the second motor is connected to the rotating shaft. A sleeve is mounted on the base plate, and a transmission rod is movably mounted inside the sleeve and is connected to the lifting plate. A locking hole is provided on the transmission rod, and a locking rod is movably mounted on the sleeve and abuts against the locking hole.

6. An aerosol particle size classifier according to claim 5, characterized in that, The guide rod is provided in several parts.

7. An aerosol particle size classifier according to claim 5, characterized in that, The sleeve is adapted to the transmission rod.

8. An aerosol particle size classifier according to claim 5, characterized in that, The card hole is adapted to the card rod.

Images