Dust aerosol generator

Abstract

The invention relates to a dust aerosol generator, and relates to the technical field of aerosol generating devices, the dust aerosol generator comprises a shell, a generating device and a control system, the generating device comprises a material bin, a powder barrel assembly, a material conveying disc, a nozzle assembly and a motor assembly; the powder barrel assembly comprises a powder barrel and an impeller, and the impeller is rotationally connected into the powder barrel; the conveying disc is rotationally connected into the cavity, and a conveying groove is formed in the upper end face of the conveying disc and communicates with the bottom of the powder barrel. The stock bin nozzle assembly comprises a runner pipe, a siphon and a return pipe, one end of the siphon is communicated with the air inlet side of the runner pipe, the communicating position of the runner pipe and the siphon is arranged in a gradually-shrinking shape, the other end of the siphon extends into the stock bin and is communicated with the material conveying groove, and one end of the return pipe is communicated with the air outlet side of the runner pipe; and the other end extends into the material bin, is communicated with the material conveying groove and is positioned beside the siphon. According to the invention, the input airflow flow and the output airflow flow are the same, and the accuracy of the subsequent dilution concentration of the dust aerosol is ensured.

Description

Technical Field

[0001] The present application relates to the field of aerosol generating devices, and in particular to a dust aerosol generator. Background Art

[0002] Inhalation toxicology is a science that studies the various conditions, laws and mechanisms of the occurrence, development and elimination of the toxic effects of inhalable substances on the body, as well as the risk assessment of inhalable substances. Its professional research content mainly includes: the physical and chemical properties of various substances in the air; the basic biology of the respiratory tract; the deposition and retention of inhaled substances in the body and their interactions with important systems and organs in the body, and how these interactions lead to the occurrence of diseases. With the increasing activity of international inhalation toxicology research, many domestic experts have also fully realized the importance of inhalation toxicology.

[0003] In existing inhalation toxicology research, the poisons studied are mainly aerosols, which include dust aerosols. Existing dust aerosol generators mainly stir the powder in the dust generating chamber by blowing the micro-particles in the dust generating chamber through airflow, so that the evenly stirred powder is blown out together with the airflow to form a dust aerosol.

[0004] However, there is a large gap between the input airflow rate and the output airflow rate of the existing dust aerosol generator. When the dust aerosol generator is used in conjunction with an inhalation exposure system, the generated dust aerosol usually needs to be diluted by a certain multiple. If there is a large gap between the input airflow rate and the output airflow rate of the generator, the subsequent dilution concentration of the dust aerosol will be uncertain, affecting the judgment of the experimental results, which needs to be improved. Summary of the invention

[0005] In view of the above problems, the present application is proposed to provide a dust aerosol generator that overcomes the above problems or at least partially solves the above problems.

[0006] The dust aerosol generator provided in this application adopts the following technical solution: A dust aerosol generator comprises a shell, a generating device and a control system, wherein the generating device comprises a silo top plate, a silo bottom plate, a powder barrel assembly, a feed tray, a nozzle assembly and a motor assembly; the silo top plate and the silo bottom plate are combined to form a silo with a cavity, and the silo is arranged on the top of the shell; The powder barrel assembly includes a powder barrel and an impeller, wherein the powder barrel is arranged above the top plate of the silo, and the bottom end of the powder barrel penetrates the top plate of the silo and extends into the interior of the silo, and the impeller is rotatably connected to the powder barrel; the feed tray is rotatably connected to the cavity, and a feed trough is arranged on the upper end surface along its circumferential direction, and the feed trough is communicated with the bottom of the powder barrel; The silo nozzle assembly includes a flow pipe, a siphon pipe and a return pipe, one end of the siphon pipe is connected to the air inlet side of the flow pipe, and the connection between the flow pipe and the siphon pipe is arranged in a tapered shape, the other end of the siphon pipe extends into the silo and is connected to the feed trough, one end of the return pipe is connected to the air outlet side of the flow pipe, and the other end extends into the silo and is connected to the feed trough and is located beside the siphon pipe; The motor assembly includes a stirring motor and a feeding motor, both of which are arranged on the bottom plate of the silo bottom plate, and the stirring motor is used to drive the impeller, and the feeding motor is used to drive the feeding tray; The control system is used to control the action of the motor assembly.

[0007] Optionally, the impeller is disposed in the cavity and is rotatably connected to the silo bottom plate, a receiving groove is also provided in the cavity, the feed tray is disposed in the receiving groove and is rotatably connected to the silo bottom plate, and the lower end surface of the impeller blade is in contact with the upper end surface of the feed tray.

[0008] Optionally, the lower end surface of the silo top plate is provided with an elastic arc strip along the circumferential direction of the powder barrel, and the elastic arc strip is in conflict with the upper end surface of the feed tray.

[0009] Optionally, the stirring motor and the feeding motor rotate in the same direction.

[0010] Optionally, the siphon tube is vertically slidably connected to the silo top plate, and the return pipe is a hose.

[0011] Optionally, the powder barrel includes a barrel body and a barrel cover, the barrel cover and the barrel body are threadedly connected, and a sealing gasket is arranged inside the barrel cover to abut against the edge position of the top end of the barrel.

[0012] Optionally, the barrel cover is transparent.

[0013] Optionally, dust rings and sealing rings are provided at the connections between the stirring motor and the feeding motor and the bottom plate of the silo.

[0014] Optionally, a sealing strip is provided at the connection between the silo top plate and the silo bottom plate.

[0015] To summarize, the present application realizes the stable generation of dust aerosols by setting up a unique nozzle assembly, and ensures the same input airflow flow rate and output airflow flow rate of the circulation pipe during the circulation of gas inside the circulation pipe, siphon tube and return pipe, thereby ensuring the same input airflow flow rate and output airflow flow rate of the generator as a whole, and ensuring the accuracy of the subsequent dust aerosol dilution concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of the connection relationship between the generating device and the motor assembly in the embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the connection relationship between the powder barrel and the feed tray in the embodiment of the present application.

[0019] Figure 4 It is a schematic diagram of the connection relationship between the impeller and the feed tray in the embodiment of the present application.

[0020] Figure 5 It is a schematic diagram of the structure of the silo top plate in the embodiment of the present application.

[0021] Figure 6 It is a schematic diagram of the internal structure of the nozzle assembly in the embodiment of the present application.

[0022] Explanation of the reference numerals: 1. Generating device; 11. Silo top plate; 111. Elastic arc strip; 12. Silo bottom plate; 13. Powder barrel assembly; 131. Powder barrel; 1311. Barrel body; 1312. Barrel cover; 132. Impeller; 14. Feed tray; 141. Feed trough; 15. Nozzle assembly; 151. Circulation pipe; 152. Siphon; 153. Reflux pipe; 16. Motor assembly; 161. Stirring motor; 162. Feed motor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0025] This embodiment provides a dust aerosol generator.

[0026] Reference Figure 1 A dust aerosol generator includes a housing, a generating device 1 and a control system. The housing is used to carry the generating device 1 and the control system. The generating device 1 is used to generate dust aerosols, and the control system is used to control the generating device 1 to move.

[0027] Reference Figure 2 , Figure 3 and Figure 4 The generating device 1 comprises a silo top plate 11, a silo bottom plate 12, a powder barrel assembly 13, a feed tray 14, a nozzle assembly 15 and a motor assembly 16. The silo top plate 11 and the silo bottom plate 12 are combined to form a silo with an internal cavity, and the silo is arranged on the top of the housing.

[0028] Reference Figure 2 , Figure 3 and Figure 4 The powder barrel assembly 13 includes a powder barrel 131 and an impeller 132. The powder barrel 131 is used to contain dust raw materials. The powder barrel 131 is vertically arranged on the silo top plate 11, and the bottom of the powder barrel 131 is arranged in an open shape. The bottom end of the powder barrel 131 penetrates the silo top plate 11 and extends to the bottom of the cavity to contact the upper end surface of the silo bottom plate 12. The impeller 132 is arranged at the bottom of the powder barrel 131 and is rotatably connected to the silo bottom plate 12, and the lower end surfaces of the impeller 132 blades are in contact with the upper end of the silo bottom plate 12. The motor assembly 16 includes a stirring motor 161, which is vertically arranged below the silo bottom plate 12 and connected to the impeller 132 to drive the impeller 132 to rotate, thereby stirring the dust raw materials in the powder barrel 131.

[0029] Reference Figure 3 , Figure 4 and Figure 5 The feed tray 14 is in a disc shape, and a receiving slot is provided in the cavity next to the impeller 132. The feed tray 14 is arranged in the receiving slot and is rotatably connected to the silo bottom plate 12, and the lower end surface of the impeller 132 blades is in contact with the upper end surface of the feed tray 14. The motor assembly 16 also includes a feed motor 162, which is arranged side by side with the stirring motor 161 and is used to drive the feed tray 14 to rotate.

[0030] An annular feed trough 141 is provided on the upper end surface of the feed disc 14 along its circumferential direction. The feed trough 141 is used to store a small amount of dust raw materials. During the rotation of the feed disc 14, the feed trough 141 transports the dust raw materials to the nozzle assembly 15 to generate dust aerosol.

[0031] In order to ensure that the dust raw materials can only be quantitatively delivered to the nozzle assembly 15 through the feed trough 141, and thus facilitate the determination of the concentration of the dust aerosol generated subsequently, a section of elastic arc strip 111 is provided on the lower end surface of the silo top plate 11 along the circumferential direction of the powder barrel 131. The elastic arc strip 111 is used to resist the upper end surface of the feed tray 14. During the same-direction rotation of the feed motor 162 and the stirring motor 161, the impeller 132 and the feed tray 14 are driven to rotate in the same direction. At this time, the elastic arc strip 111 is against the upper end surface of the feed tray 14 to prevent the dust raw materials from sticking to the upper end surface of the feed tray 14, thereby ensuring that the dust raw materials can only be delivered to the nozzle assembly 15 through the feed trough 141, thereby ensuring the feeding accuracy of the feed tray 14.

[0032] Reference Figure 2 , Figure 4 and Figure 6 The nozzle assembly 15 includes a flow pipe 151, a siphon pipe 152 and a return pipe 153. The flow pipe 151 is horizontally arranged above the silo and above the feed tray 14, and the siphon pipe 152 is vertically arranged. One end of the siphon pipe 152 is connected to the air inlet side of the flow pipe 151, and the connection between the siphon pipe 152 and the flow pipe 151 is arranged in a tapered shape to realize the accelerated movement of high-pressure air when compressed through the connection between the siphon pipe 152 and the flow pipe 151; the other end penetrates the silo top plate 11 and extends into the silo, and is connected to the feed trough 141. One end of the return pipe 153 is connected to the air outlet side of the flow pipe 151, and the other side penetrates the silo top plate 11 and extends to the silo to be connected to the feed trough 141, and is located next to the siphon pipe 152.

[0033] When compressed high-pressure air flows in from the inlet side of the circulation tube 151, it passes through the tapered area of ​​the circulation tube 151, where the high-pressure air is accelerated and low pressure is generated in the siphon tube 152; when the high-pressure air flows through the outlet side of the circulation tube 151, since the outlet side of the circulation tube 151 is connected to the oral and nasal exposure system or the outside world, the air flowing through the outlet side becomes normal pressure, so there is a pressure difference between the siphon tube 152 and the return pipe 153, and the pressure difference in the siphon tube 152 is relatively low, so part of the air flows back to the siphon tube 152 through the return pipe 153, forming an airflow and driving the dust to flow along the siphon tube 152 to the tapered area of ​​the circulation tube 151, where a dust aerosol is formed due to the high-speed airflow in the tapered area; since the gas only circulates inside the circulation tube 151, the return pipe 153 and the siphon tube 152, without the entry of outside air, the input flow rate and the output flow rate in the circulation tube 151 are ensured to be equal.

[0034] Reference Figure 3 and Figure 4 In order to ensure the airtightness of the generating device 1 area, dustproof pads and sealing rings are provided at the connections between the stirring motor 161, the feeding motor 162 and the silo bottom plate 12, and sealing strips are provided at the connections between the silo top plate 11 and the silo bottom plate 12; the preferred solution is that the silo top plate 11 and the silo bottom plate 12 are oppositely arranged on one side and are provided with an annular groove surrounding the powder barrel 131 and the feeding disc 14, and the annular groove is for the annular sealing strip to be embedded.

[0035] Reference Figure 3 The powder barrel 131 includes a barrel body 1311 and a barrel cover 1312 threadedly connected to the barrel body 1311 . In order to ensure the sealing of the powder barrel 131 in the overall working state, a sealing gasket for contacting the top of the barrel body 1311 is arranged inside the barrel cover 1312 .

[0036] Since the dust is transported from the powder barrel 131 to the nozzle assembly 15 via the conveying plate, when the dust material floods the impeller 132, the dust material can be added to the powder barrel 131. In order to facilitate observation of the amount of dust material in the powder barrel 131, the barrel cover 1312 is preferably provided in a transparent shape.

[0037] Reference Figure 2 The siphon tube 152 is vertically slidably connected to the silo top plate 11, and the return pipe 153 is set as a hose, so as to control the distance between the siphon tube 152 and the feed trough 141 according to the different flow rates, thereby ensuring the accuracy of the aerosol generation concentration. In order to realize the convenient adjustment and fixation of the position of the siphon tube 152, a top screw structure for fixing the position of the siphon tube 152 is also set above the silo top plate 11.

[0038] At the same time, in order to ensure the tightness of the connection between the siphon tube 152 and the silo in the sliding connection state, a sealing ring is also provided at the sliding connection between the siphon tube 152 and the silo.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dust aerosol generator, comprising a housing, a generating device (1) and a control system, characterized in that: The generating device (1) comprises a silo top plate (11), a silo bottom plate (12), a powder barrel assembly (13), a feed tray (14), a nozzle assembly (15) and a motor assembly (16); the silo top plate (11) and the silo bottom plate (12) are combined to form a silo with a cavity, and the silo is arranged on the top of the housing; The powder barrel assembly (13) comprises a powder barrel (131) and an impeller (132), wherein the powder barrel (131) is arranged above the silo top plate (11), and the bottom end of the powder barrel (131) penetrates through the silo top plate (11) and extends into the silo, and the impeller (132) is rotatably connected to the powder barrel (131); the feed tray (14) is rotatably connected to the cavity, and a feed trough (141) is arranged on the upper end surface along its circumferential direction, and the feed trough (141) is communicated with the bottom of the powder barrel (131); The silo nozzle assembly (15) comprises a circulation pipe (151), a siphon pipe (152) and a return pipe (153); one end of the siphon pipe (152) is connected to the air inlet side of the circulation pipe (151), and the connection point between the circulation pipe (151) and the siphon pipe (152) is arranged in a tapered shape; the other end of the siphon pipe (152) extends into the silo and is connected to the feed trough (141); one end of the return pipe (153) is connected to the air outlet side of the circulation pipe (151), and the other end extends into the silo and is connected to the feed trough (141) and is located beside the siphon pipe (152); The motor assembly (16) comprises a stirring motor (161) and a feeding motor (162), wherein the stirring motor (161) and the feeding motor (162) are both arranged on the bottom plate of the silo bottom plate (12), and the stirring motor (161) is used to drive the impeller (132), and the feeding motor (162) is used to drive the feeding tray (14); The control system is used to control the action of the motor assembly (16).

2. A dust aerosol generator according to claim 1, characterized in that: The impeller (132) is arranged in the cavity and is rotatably connected to the silo bottom plate (12). A receiving groove is also arranged in the cavity. The feed tray (14) is arranged in the receiving groove and is rotatably connected to the silo bottom plate (12), and the lower end surface of the impeller blade (132) is in contact with the upper end surface of the feed tray (14).

3. A dust aerosol generator according to claim 2, characterized in that: The lower end surface of the silo top plate (11) is provided with an elastic arc strip (111) along the circumferential direction of the powder barrel (131), and the elastic arc strip (111) is in contact with the upper end surface of the feed tray (14).

4. A dust aerosol generator according to claim 3, characterized in that: The stirring motor (161) and the feeding motor (162) rotate in the same direction.

5. The dust aerosol generator according to claim 1, characterized in that: The siphon tube (152) is vertically slidably connected to the silo top plate (11), and the return pipe (153) is a hose.

6. The dust aerosol generator according to claim 1, characterized in that: The powder barrel (131) comprises a barrel body (1311) and a barrel cover (1312), wherein the barrel cover (1312) and the barrel body (1311) are threadedly connected, and a sealing gasket is arranged inside the barrel cover (1312) for contacting the top edge of the barrel body (1311).

7. A dust aerosol generator according to claim 6, characterized in that: The barrel cover (1312) is transparent.

8. The dust aerosol generator according to claim 1, characterized in that: Dustproof rings and sealing rings are provided at the connection points between the stirring motor (161) and the feeding motor (162) and the silo bottom plate (12).

9. The dust aerosol generator according to claim 1, characterized in that: A sealing strip is provided at the connection between the silo top plate (11) and the silo bottom plate (12).

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