Dry powder aerosol generator

Abstract

The utility model provides a dry powder aerosol generator. A sample disc is arranged at the top of a shell of a driving part; the driving assembly is arranged in the driving part shell and can drive the sample disc to rotate; the sample disc dust cover is arranged at the top of the driving part shell; the aerosol generating assembly is in contact with the sample disc and can suck dry powder on the sample disc; the aerosol generation assembly comprises a Venturi tube and a powder suction pipeline which are connected with each other; an air inlet, an air inlet compression area, a venturi negative pressure area and an aerosol outlet which are communicated in sequence are formed in the venturi tube; a powder suction channel is formed in the powder suction pipeline; one end of the powder suction channel is communicated with the sample groove on the sample disc through the powder suction port, and the other end of the powder suction channel is communicated with the venturi negative pressure area. The Venturi effect is adopted, when fluid passes through the gradually-shrunk pipeline, the speed of the fluid is increased, the pressure of the fluid is reduced, and dry powder particles can be effectively sucked and converted into aerosol to be sprayed out through the pressure difference formed in the pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of laboratory animal instruments, specifically to a dry powder aerosol generator, particularly a micro-dry powder aerosol generator, and especially a device capable of uniformly generating milligram-level dry powder substances. Background Technology

[0002] Traditional aerosol generators are typically designed for large quantities of powder samples, making them unsuitable for researchers who need to use only extremely small amounts (e.g., milligram levels) of rare, expensive, or sensitive materials. Therefore, there is a clear need for techniques that can efficiently utilize small amounts of sample without waste. Generating stable and uniformly distributed aerosols from very small amounts of dry powder is not easy, as small sample quantities are susceptible to environmental factors such as static electricity and humidity changes, leading to uneven dispersion or loss. Furthermore, ensuring that these trace amounts of sample retain their original properties during the conversion process is crucial. Existing aerosol generation methods are either unsuitable for handling such small sample volumes or cannot guarantee the integrity and stability of the sample throughout the process.

[0003] Patent document CN218654390U discloses a simple dry powder aerosol generator, including a tank, a tank cover, an air inlet pipe, and a sheet-like metal mesh baffle. The bottom of the tank is used to hold dry powder particles; the tank and the tank cover are sealed together to form a reaction chamber; the tank cover has an outlet for outputting dry powder aerosol; the air inlet pipe passes through the tank cover and extends downward to the reaction chamber; multiple gas nozzles are provided at the same height at the end of the air inlet pipe; the gas nozzles are used to spray gas vertically downward; the metal mesh baffle is fixed to the air inlet pipe and located above the gas nozzles. However, this patent document still has the defect of not being able to guarantee the integrity and stability of the sample throughout the process. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a dry powder aerosol generator.

[0005] A dry powder aerosol generator according to this utility model includes:

[0006] Drive unit housing;

[0007] A sample tray is disposed on top of the housing of the drive section;

[0008] A drive assembly is disposed within the housing of the drive section and is capable of driving the sample disk to rotate;

[0009] A dust cover for the sample tray is located on the top of the drive housing and covers the sample tray.

[0010] The aerosol generating component comes into contact with the sample tray and can absorb the dry powder on the sample tray to form an aerosol;

[0011] The aerosol generating component includes a venturi tube and a powder suction tube connected together.

[0012] The Venturi tube contains an air inlet, an air compression zone, a Venturi negative pressure zone, and an aerosol outlet connected in sequence; the powder suction pipe contains a powder suction channel.

[0013] One end of the powder suction channel is connected to the sample slot on the sample tray through the powder suction port, and the other end of the powder suction channel is connected to the Venturi negative pressure zone.

[0014] Preferably, the dust cover is detachably mounted on the drive unit housing via a first fixing bolt.

[0015] Preferably, the drive assembly is connected to the sample disk via a sample disk drive shaft.

[0016] Preferably, the sample disk is a circular disk, and the sample groove is an annular groove provided along the edge of the circular disk.

[0017] Preferably, the dust cover of the sample tray is transparent.

[0018] Preferably, the venturi tube and the powder suction tube are detachably connected by a second fixing bolt.

[0019] Preferably, the driving component is a drive motor.

[0020] Preferably, both the drive housing and the sample tray dust cover are rectangular parallelepipeds.

[0021] Preferably, the aerosol outlet is connected to the exposure chamber for discharging the generated aerosol into the exposure chamber.

[0022] Preferably, it also includes a powder presser, which is installed above the sample cell and is used to ensure that the sample is evenly distributed in the sample cell when adding powder.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This utility model adopts the Venturi effect, in which a Venturi negative pressure zone is formed in the Venturi tube. When the fluid passes through the gradually narrowing pipe, its speed increases while its pressure decreases. The pressure difference in the pipe can effectively absorb the dry powder particles and convert them into aerosols for spraying.

[0025] 2. This invention compresses the gas at the gas inlet to form a high-speed flowing gas. When the gas flows through the narrow part of the Venturi tube, a significant pressure drop occurs. The low-pressure area formed here is much lower than the surrounding ambient pressure, forming a negative pressure area. This negative pressure helps to attract and draw the dry powder located in this area into the airflow. When the dry powder is drawn into the high-speed airflow, it will quickly mix with the air. The energy of the high-speed airflow causes the dry powder particles to collide and disperse with each other, thereby forming fine particles suspended in the air, which forms an aerosol. The formed dry powder aerosol is then discharged from the outlet end of the Venturi tube and can be used in various scenarios such as exposure to poison. Attached Figure Description

[0026] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 Schematic diagram of the planar structure of a dry powder aerosol generator Figure 1 ;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0029] Figure 3 Schematic diagram of the planar structure of a dry powder aerosol generator Figure 2 ;

[0030] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along line FF;

[0031] Figure 5 A three-dimensional structural diagram of a dry powder aerosol generator;

[0032] Figure 6 This is a schematic diagram of the exploded structure of a dry powder aerosol generator.

[0033] The diagram shows:

[0034] Drive section housing 1, powder suction channel 11

[0035] Sample tray 2 Sample slot 12

[0036] Drive assembly 3 First fixing bolt 13

[0037] Sample tray dust cover 4 Sample tray drive shaft 14

[0038] Venturi tube 5, second fixing bolt 15

[0039] Powder suction pipe 6, height adjustment bolt 16

[0040] Air intake 7, lifting spring 17

[0041] Intake compression zone 8 Mounting housing 18

[0042] Venturi negative pressure zone 9 Drive plug 19

[0043] Aerosol outlet 10, powder suction port 20 Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0045] Example 1

[0046] like Figures 1 to 6 As shown, this embodiment provides a dry powder aerosol generator, including: a drive housing 1, a sample tray 2, a drive assembly 3, a sample tray dust cover 4, and an aerosol generating assembly.

[0047] The sample tray 2 is located on the top of the drive housing 1; the drive assembly 3 is located inside the drive housing 1 and can drive the sample tray 2 to rotate; the sample tray dust cover 4 is located on the top of the drive housing 1 and covers the sample tray 2; the aerosol generating assembly is in contact with the sample tray 2 and can absorb the dry powder on the sample tray 2 to form an aerosol.

[0048] The dust cover is detachably mounted on the drive housing 1 via the first fixing bolt 13. The drive assembly 3 is connected to the sample disk 2 via the sample disk drive shaft 14. The sample disk 2 is a circular disk, and the sample groove 12 is an annular groove set along the edge of the circular disk. The sample disk dust cover 4 is a transparent structure. The drive assembly 3 is a drive motor. Both the drive housing 1 and the sample disk dust cover 4 are cuboid in shape.

[0049] The aerosol generating assembly includes a venturi tube 5 and a powder suction line 6 connected together. The venturi tube 5 has an air inlet 7, an air inlet compression zone 8, a venturi negative pressure zone 9 and an aerosol outlet 10 connected in sequence. The powder suction line 6 has a powder suction channel 11. One end of the powder suction channel 11 is connected to the sample slot 12 on the sample tray 2 through the powder suction port, and the other end of the powder suction channel 11 is connected to the venturi negative pressure zone 9.

[0050] The Venturi tube 5 and the powder suction line 6 are detachably connected by the second fixing bolt 15. The aerosol outlet 10 is connected to the exposure chamber and is used to discharge the generated aerosol into the exposure chamber. The dry powder aerosol generator also includes a powder compactor, which is installed above the sample cell 12 to ensure that the sample is evenly distributed in the sample cell 12 when powder is added.

[0051] The dry powder aerosol generator also includes a mounting housing 18, which is mounted on the drive housing 1. The upper half of the mounting housing 18 is equipped with a height adjustment bolt 16, which is connected to the aerosol generating component. The lower half of the mounting housing 18 is equipped with a lifting spring 17, which is also connected to the aerosol generating component. The height adjustment bolt 16 is threadedly connected to the mounting housing 18, enabling the aerosol generating component to move up and down, thereby adjusting the relative position of the powder suction port 20 of the aerosol generating component and the sample slot 12 of the sample tray 2. The powder suction end of the aerosol generating component passes through the mounting housing 18 and contacts the sample tray 2. The mounting housing 18 is provided with a through-groove for the aerosol generating component to pass through, allowing the aerosol generating component to move up and down within the through-groove.

[0052] This embodiment uses a height adjustment bolt on the mounting housing. By rotating the height adjustment bolt and simultaneously using a lifting spring for assisted lifting, the height of the powder suction port can be adjusted according to actual needs, meeting different powder suction distance requirements and greatly improving the powder suction effect.

[0053] In this embodiment, the height of the powder suction port can be continuously adjusted by adjusting the height bolt. As the surface of the dry powder in the sample cell changes, the distance between the powder suction port and the surface of the dry powder can always be kept within a good powder suction distance range, thereby enabling the full absorption of dry powder from the sample cell.

[0054] Example 2

[0055] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0056] This embodiment provides a micro-powder aerosol generator, which is an aerosol generator specially designed for rare and precious dry powder samples. The speed and duration can be set through the equipment control system.

[0057] The core of this embodiment lies in the use of the Venturi effect, a fluid dynamics phenomenon where fluid velocity increases and pressure decreases as it passes through a gradually narrowing pipe. The pressure difference along the pipe's path effectively draws in dry powder particles and converts them into aerosols for ejection.

[0058] The following is the principle of dry powder aerosol generation using the Venturi technique:

[0059] 1. Airflow: High-speed airflow or gas is introduced into the wide end of the venturi tube. This high-speed airflow will produce a significant pressure drop in the narrow part (throat) of the venturi tube.

[0060] 2. Negative pressure formation: Due to the Venturi effect, the low-pressure area formed in the throat is much lower than the surrounding environment pressure. This negative pressure helps to attract and draw dry powder into the airflow.

[0061] 3. Dry powder introduction: The dry powder is usually stored in a container and connected to the powder inlet of the Venturi device. Due to the negative pressure generated in the throat, the dry powder is drawn into the fast-moving airflow.

[0062] 4. Mixing and Dispersion: When the dry powder is drawn into the high-speed airflow, it will quickly mix with the air. The energy of the high-speed airflow causes the dry powder particles to collide and disperse with each other, thus forming fine particles suspended in the air, which forms an aerosol.

[0063] 5. Aerosol output: The formed dry powder aerosol is then discharged from the outlet end of the venturi tube and can be used in various application scenarios, such as drug delivery, fire extinguishing, industrial spraying, etc.

[0064] 6. Optimize parameters: To ensure the best aerosol generation effect, some key parameters need to be adjusted, such as the airflow speed, dry powder supply, and the design of the venturi tube, in order to achieve the ideal particle size distribution and concentration.

[0065] 7. Uniformity and stability: For some applications, maintaining the uniformity and stability of the aerosol is very important, which involves further engineering design, such as adding vibration or rotation mechanisms to help distribute the dry powder more evenly.

[0066] In summary, the Venturi technique provides a simple yet effective means of generating dry powder aerosols, requiring no complex mechanical or electronic components and utilizing fundamental physical principles. This method is not only cost-effective but also enables efficient and controllable aerosol production.

[0067] Building upon the aforementioned hardware structure, an advanced control system can be further equipped, allowing users to precisely set the rotation speed (affecting vortex intensity) and duration (determining the processing cycle) according to specific experimental requirements. This enables researchers to optimize parameters for different types of dry powders to obtain ideal aerosol properties. Due to their high precision and low consumption, this type of aerosol generator is ideally suited for laboratory research, especially in the field of pharmaceutical development, such as the development of inhaled therapeutic drugs; it can also be used in environmental monitoring, food safety testing, and other fields, particularly when quantitative analysis of specific components is required.

[0068] A height adjustment bolt 16 is installed at the powder suction port to adjust the height of the powder suction port. When adding powder, adjust it to the top and adjust it downwards to the appropriate position when in use.

[0069] A square sample tray dust cover prevents dust or other samples from falling into the tray. A dust outlet connects to the exposure chamber. A powder suction port stores powdery samples sucked in by the negative pressure zone. A circular sample tray serves as the external receiving area for the sample reservoir. Sample tray dust cover fixing bolts secure the dust cover and facilitate disassembly.

[0070] The drive unit housing is the outer housing of the drive motor. The air inlet is for high-speed airflow. The intake compression zone is used to compress the introduced high-speed flowing gas. A Venturi negative pressure zone is formed in this narrow area, which helps to attract and draw dry powder into the airflow.

[0071] The sample well is where the sample is added. A powder presser is located above the sample well; this presser ensures a more even distribution of the sample within the well during powder addition and must be used in conjunction with a powder-adding brush. The dust outlet connects to the contaminated exposure chamber.

[0072] The air inlet is located at the wide end of the Venturi tube, introducing high-speed air or gas. The intake compression zone immediately follows the air inlet, compressing the introduced high-speed gas. The Venturi negative pressure zone is located in the narrow section of the Venturi tube, forming a low-pressure area that attracts and draws dry powder into the airflow. The powder suction port is connected to the negative pressure zone of the Venturi tube and is used to store the powdered sample drawn in by the negative pressure zone.

[0073] The sample cell is directly connected to the powder suction port and the negative pressure zone of the venturi tube, serving as the dry powder addition point. The circular sample tray is the receiving area outside the sample cell and is connected to it. The powder accumulator is installed above the sample cell to ensure more uniform sample distribution within the cell during powder addition. The dust outlet is located on one side of the device and is used to connect to the exposure chamber to discharge the generated dry powder aerosol.

[0074] The powder suction port height adjustment bolt 16 is connected to the powder suction port and is used to adjust the height of the powder suction port. The square sample tray dust cover is fixed to the device by the sample tray dust cover fixing bolt to prevent dust or other samples from entering the sample tray.

[0075] The drive unit housing encloses the drive motor, which includes a sample tray drive shaft. This shaft enables the sample tray to rotate continuously. The sample tray drive shaft is a bearing that drives the sample tray to rotate continuously, and the drive motor rotates it. The drive plug 19 connects to the communication plug of the dry powder generator controller to control the equipment. The lifting spring 17 assists in adjusting the height of the powder suction port.

[0076] In this embodiment, the gas is compressed at the gas inlet to form a high-speed flowing gas. As the gas flows through the narrow section (throat) of the venturi tube, a significant pressure drop occurs, creating a low-pressure area much lower than the surrounding environment, forming a negative pressure zone. This negative pressure helps attract and draw dry powder located in this area into the airflow. Once the dry powder is drawn into the high-speed airflow, it quickly mixes with the air. The energy of the high-speed airflow causes the dry powder particles to collide and disperse, forming fine particles suspended in the air, thus forming an aerosol. The resulting dry powder aerosol is then discharged from the outlet of the venturi tube and can be used in various scenarios such as exposure to toxic substances.

[0077] The dry powder is stored in a sample tray, which can rotate with the motor drive shaft, so that the dry powder is continuously drawn into the Venturi negative pressure zone and thus generates powder.

[0078] This invention utilizes the Venturi effect, where fluid velocity increases and pressure decreases as it passes through a gradually narrowing pipe. The pressure difference created in the pipe effectively draws in dry powder particles and converts them into aerosols for spraying.

[0079] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0080] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A dry powder aerosol generator, characterized in that, include: Drive section housing (1); Sample tray (2) is disposed on top of the drive housing (1); A drive assembly (3) is disposed inside the drive housing (1) and is capable of driving the sample disk (2) to rotate; A sample tray dust cover (4) is provided on the top of the drive housing (1) and covers the sample tray (2); The aerosol generating component is in contact with the sample tray (2) and can absorb the dry powder on the sample tray (2) to form an aerosol; The aerosol generating assembly includes a venturi tube (5) and a powder suction tube (6) connected to each other. The Venturi tube (5) has an air inlet (7), an air compression zone (8), a Venturi negative pressure zone (9), and an aerosol outlet (10) connected in sequence; the powder suction pipe (6) has a powder suction channel (11). One end of the powder suction channel (11) is connected to the sample slot (12) on the sample tray (2) through the powder suction port, and the other end of the powder suction channel (11) is connected to the Venturi negative pressure zone (9).

2. The dry powder aerosol generator according to claim 1, characterized in that, The dust cover is detachably mounted on the drive housing (1) by means of the first fixing bolt (13).

3. The dry powder aerosol generator according to claim 1, characterized in that, The drive assembly (3) is connected to the sample disk (2) via the sample disk drive shaft (14).

4. The dry powder aerosol generator according to claim 1, characterized in that, The sample disk (2) is a circular disk, and the sample groove (12) is an annular groove provided along the edge of the circular disk.

5. The dry powder aerosol generator according to claim 1, characterized in that, The dust cover (4) of the sample tray is transparent.

6. The dry powder aerosol generator according to claim 1, characterized in that, The Venturi tube (5) and the powder suction pipe (6) are detachably connected by the second fixing bolt (15).

7. The dry powder aerosol generator according to claim 1, characterized in that, The drive component (3) is a drive motor.

8. The dry powder aerosol generator according to claim 1, characterized in that, Both the drive housing (1) and the sample tray dust cover (4) are rectangular.

9. The dry powder aerosol generator according to claim 1, characterized in that, The aerosol outlet (10) is connected to the exposure chamber and is used to discharge the generated aerosol into the exposure chamber.

10. The dry powder aerosol generator according to claim 1, characterized in that, It also includes a powder presser, which is installed above the sample cell (12) to ensure that the sample is evenly distributed in the sample cell (12) when powder is added.

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