Large-flow biological aerosol sampler

Abstract

The invention relates to a high-flow biological aerosol sampler, which relates to the technical field of biological aerosol sampling, and comprises a body, a sampling mechanism, a liquid supplementing mechanism and an airflow detection mechanism, the sampling mechanism comprises a fan, a rotating chamber and a sampling pipe which are sequentially arranged from top to bottom, the rotating chamber is respectively communicated with the fan and the sampling pipe, and the side surface of the rotating chamber is communicated with a tapered air inlet; the liquid supplementing mechanism comprises a liquid supplementing bottle, a liquid supplementing opening, a liquid supplementing pump and a control system, the liquid supplementing opening is formed in the sampling mechanism and communicated with the sampling mechanism, the liquid supplementing pump is communicated with the liquid supplementing bottle and the liquid supplementing opening and used for conveying the sampling liquid from the liquid supplementing bottle to the sampling mechanism, and the control system is used for controlling the liquid supplementing pump to act. According to the invention, the airflow detection mechanism linked with the liquid supplementing mechanism is arranged, so that the sampling liquid is automatically supplemented and corrected in real time, and the long-time or all-weather sampling requirement of the sampler is effectively met.

Description

Technical Field

[0001] This application relates to the field of bioaerosol sampling, and in particular to a high-flow-rate bioaerosol sampler. Background Technology

[0002] Currently, there are many high-flow-rate bioaerosol samplers on the market for sampling microorganisms in the air. Based on the sampling principle, they are mainly based on impact sampling principle and centrifugal sampling principle. Sampling with relatively larger flow rates generally adopts the centrifugal principle.

[0003] Most centrifugal air samplers lack a sampling liquid replenishment function, have short sampling times, and cannot achieve long-term or all-weather sampling. Some high-flow-rate bioaerosol samplers can replenish liquid, but this is done on a timed basis. While this may meet requirements for short periods, the evaporation rate of the sampling liquid varies under different sampling environments. Over time, due to accumulated errors, sampling performance is affected. On one hand, if the timed replenishment amount is lower than the evaporation rate, the total amount of sampling liquid decreases until it is depleted during prolonged sampling. On the other hand, if the timed replenishment amount is higher than the evaporation rate, the total amount of sampling liquid increases during prolonged sampling, eventually overflowing the sampler. This requires improvement. Summary of the Invention

[0004] In view of the above problems, this application is made in order to provide a high-flow-rate bioaerosol sampler that overcomes or at least partially solves the above problems.

[0005] This application provides a high-flow-rate bioaerosol sampler using the following technical solution: A high-flow-rate bioaerosol sampler includes a body, a sampling mechanism, a liquid replenishment mechanism, and a flow detection mechanism; the body is used to support the sampling mechanism, the liquid replenishment mechanism, and the flow detection mechanism. The sampling mechanism includes a fan, a rotating chamber, and a sampling tube arranged sequentially from top to bottom. The upper end of the rotating chamber is connected to the air inlet of the fan, and the lower end is connected to the sampling tube. A tapered air inlet is provided on the side of the rotating chamber. The replenishment mechanism includes a replenishment bottle, a replenishment port, a replenishment pump, and a control system. The replenishment port is located on and connected to the sampling mechanism. The replenishment pump is connected to the replenishment bottle and the replenishment port and is used to transport the sampling liquid from the replenishment bottle to the sampling mechanism. The control system is used to control the operation of the replenishment pump. The airflow detection mechanism is connected to the air outlet of the fan and electrically connected to the control system. It is used to detect the airflow flow information at the air outlet of the fan. The control system receives the airflow flow information from the airflow detection mechanism and analyzes and processes it. When the airflow flow at the air outlet of the fan decreases, the control system controls the replenishment pump to replenish the liquid.

[0006] Optionally, the airflow detection mechanism includes an air duct, a proportional bend, and a flow sensor. The air duct is located at and connected to the air outlet of the fan. The proportional bend is located inside the air duct with its inlet facing the air outlet of the fan and its outlet connected to the flow sensor. The flow sensor is electrically connected to the control system.

[0007] Optionally, the liquid replenishment port is located on the air inlet.

[0008] Optionally, the rotating chamber is movably connected to both the fan and the sampling tube.

[0009] Optionally, the air inlet end of the air inlet is provided with a baffle plate.

[0010] Optionally, a tubular sensor is connected in the pipeline between the replenishment pump and the replenishment port, and the tubular sensor is used to detect whether there is sampling liquid passing through the connecting pipeline.

[0011] Optionally, an alarm is provided on the machine body, and the alarm is electrically connected to the tubular sensor.

[0012] In summary, this application includes the following beneficial technical effects: By setting up an airflow detection mechanism to detect changes in airflow at the fan outlet and determine changes in negative pressure within the sampling tube, the remaining amount of sampling liquid in the sampling bottle can be determined, thus achieving automatic detection of the sampling liquid volume within the sampling tube; simultaneously, by setting up a liquid replenishment structure linked to the airflow detection mechanism, automatic real-time replenishment of the sampling liquid within the sampling tube is achieved, realizing both automatic replenishment of the sampling liquid and avoiding the problem of excessive replenishment and overflow, effectively ensuring the stable operation of the aerosol sampler. By setting up a movable connection between the rotating chamber and the sampling tube, convenient replacement of the rotating chamber and the sampling tube is achieved, facilitating the disinfection of both. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0014] Figure 2 This is a schematic diagram showing the connection relationship between the sampling mechanism, the liquid replenishment mechanism, and the airflow detection mechanism in the embodiments of this application.

[0015] Figure 3 This is a schematic diagram of the connection between the air duct and the proportional bend in the embodiment of this application.

[0016] Explanation of reference numerals in the attached drawings: 1. Body; 2. Sampling mechanism; 21. Fan; 22. Rotating chamber; 221. Air inlet; 23. Sampling tube; 3. Liquid replenishment mechanism; 31. Liquid replenishment bottle; 32. Liquid replenishment port; 33. Liquid replenishment pump; 4. Airflow detection mechanism; 41. Air duct; 42. Proportional bend; 43. Flow sensor; 5. Tubular sensor. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are one embodiment of this invention, and not all embodiments. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0018] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0019] This embodiment provides a high-flow-rate bioaerosol sampler.

[0020] Reference Figure 1 , Figure 2 and Figure 3 A high-flow-rate bioaerosol sampler includes a body 1, a sampling mechanism 2, a liquid replenishment mechanism 3, and an airflow detection mechanism 4. The body 1 is used to support the sampling mechanism 2, the liquid replenishment mechanism 3, and the airflow detection mechanism 4.

[0021] The sampling mechanism 2 is vertically positioned on one side of the body 1. It includes a fan 21, a rotating chamber 22, and a sampling tube 23, arranged sequentially from top to bottom. Both the fan 21 and the rotating chamber 22 are located inside the body 1. The upper port of the rotating chamber 22 is connected to the air inlet of the fan 21, and the lower port is connected to the sampling tube 23. The rotating chamber 22 is movably connected to both the fan 21 and the sampling tube 23; preferably, the connection method is a plug-in connection or a threaded connection.

[0022] The rotating chamber 22 has a tapered air inlet 221 connected to its side, and a baffle plate is installed at the port of the air inlet 221. When the fan 21 is working, the air moves along the gradually narrowing air passage of the air inlet 221 and accelerates into the rotating chamber 22. Centrifugal force is generated in the rotating chamber 22, and under the negative pressure of the fan 21, the rotating airflow moves spirally downward along the wall. Due to the airflow disturbance, the sampling liquid in the sampling tube 23 moves spirally along the wall. Under the action of centrifugal force, the tiny particles in the airflow are thrown into the sampling liquid for collection. The airflow passes through the bottom of the sampling tube 23 and moves spirally upward in the opposite direction. Finally, it is discharged through the fan 21, thus achieving the purpose of aerosol sampling.

[0023] Reference Figure 2 The replenishment mechanism 3 is used to replenish the sampling liquid in the sampling mechanism 2 to ensure the sampling needs of the sampler for a long time or all day.

[0024] The replenishment mechanism 3 includes a replenishment bottle 31, a replenishment port 32, a replenishment pump 33, and a control system. The replenishment bottle 31 is located on the outside of the main body 1, and the replenishment port 32 is connected to the sampling mechanism 2. Specifically, it can be located at the air inlet 221 of the rotating chamber 22, the side wall of the sampling tube 23, or the bottom of the sampling tube 23, with the air inlet 221 being the preferred location. Both the replenishment pump 33 and the control system are located inside the main body 1. The inlet end of the replenishment pump 33 is connected to the replenishment bottle 31, and the outlet end is connected to the replenishment port 32. This allows the pump to directly deliver the sampled liquid into the sampling tube 23 through the replenishment port 32 or indirectly into the sampling tube 23 through the rotating chamber 22, thus replenishing the liquid during the sampling process. The control system is electrically connected to the replenishment pump 33 and is used to control the operation of the replenishment pump 33.

[0025] To detect whether there is sampling liquid in the replenishment bottle 31, a tubular sensor 5 is connected to the connecting pipe between the replenishment pump 33 and the replenishment port 32, and an alarm is installed on the body 1 that is electrically connected to the tubular sensor 5; when the tubular sensor 5 detects that no sampling liquid is passing through the connecting pipe, the alarm will sound to remind the experimenter to add sampling liquid to the storage bottle.

[0026] Reference Figure 2 , Figure 3 The airflow detection mechanism 4 is located at and connected to the air outlet of the fan 21, and is used to detect the airflow rate at the air outlet of the fan 21. It includes a duct 41, a proportional bend 42, and a flow sensor 43.

[0027] The air inlet of the duct 41 is connected to the air outlet of the fan 21, and a dust baffle is installed at the air outlet. A proportional bend 42 is installed inside the duct 41, with the air inlet of the proportional bend 42 facing the air outlet of the fan 21. The air outlet is connected to a flow sensor 43 to calculate the airflow at the air outlet of the fan 21 proportionally by detecting the airflow rate entering the bend.

[0028] The flow sensor 43 is electrically connected to the control system and is used to transmit airflow information to the control system. The control system analyzes and processes the transmitted airflow information, analyzes the changes in airflow, and when the airflow at the outlet of the fan 21 decreases, the control system controls the replenishment pump 33 to perform corresponding actions to replenish the liquid.

[0029] The specific working principle is as follows: During the sampling process, the amount of liquid in the sampling tube 23 will affect the negative pressure in the bottle. Assuming that the fan 21 is working at a constant power in the initial state, the smaller the amount of sampled liquid, the lower the negative pressure in the sampling tube 23 and the relatively higher the air pressure value. Since the power of the fan 21 = wind pressure (i.e. air pressure) × air volume, the air flow rate at the outlet of the fan 21 is relatively reduced at this time. When the flow sensor 43 detects a decrease in the airflow at the outlet of the fan 21, it transmits the airflow change information to the control system. The control system then controls the replenishment pump 33 to move the sampling liquid from the storage bottle to the sampling tube 23 to replenish the sampling liquid in the sampling tube 23. When the sampling liquid is replenished to a certain level, the negative pressure in the sampling tube 23 returns to normal, and the airflow at the outlet of the fan 21 also returns to normal. The flow sensor 43 transmits the airflow information to the control system again. The control system analyzes the airflow and controls the replenishment pump 33 to stop operating, thereby realizing real-time automatic replenishment of the sampling liquid.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-flow-rate bioaerosol sampler, characterized in that: It includes a body (1), a sampling mechanism (2), a liquid replenishment mechanism (3), and an airflow detection mechanism (4), wherein the body (1) is used to carry the sampling mechanism (2), the liquid replenishment mechanism (3), and the airflow detection mechanism (4); The sampling mechanism (2) includes a fan (21), a rotating chamber (22) and a sampling tube (23) arranged sequentially from top to bottom. The upper end of the rotating chamber (22) is connected to the air inlet of the fan (21), and the lower end is connected to the sampling tube (23). A tapered air inlet (221) is provided on the side of the rotating chamber (22). The replenishment mechanism (3) includes a replenishment bottle (31), a replenishment port (32), a replenishment pump (33), and a control system. The replenishment port (32) is disposed on and connected to the sampling mechanism (2). The replenishment pump (33) is connected to the replenishment bottle (31) and the replenishment port (32) and is used to transport the sampling liquid from the replenishment bottle (31) to the sampling mechanism (2). The control system is used to control the operation of the replenishment pump (33). The airflow detection mechanism (4) is connected to the air outlet of the fan (21) and electrically connected to the control system. It is used to detect the airflow flow information at the air outlet of the fan (21). The control system receives the airflow flow information from the airflow detection mechanism (4) and analyzes and processes it. When the airflow flow at the air outlet of the fan (21) decreases, the control system controls the liquid replenishment pump (33) to replenish the liquid.

2. The high-flow-rate bioaerosol sampler according to claim 1, characterized in that: The airflow detection mechanism (4) includes an air duct (41), a proportional bend (42), and a flow sensor (43). The air duct (41) is located at the air outlet of the fan (21) and connected to it. The proportional bend (42) is located inside the air duct (41) and its air inlet faces the air outlet of the fan (21). Its air outlet is connected to the flow sensor (43). The flow sensor (43) is electrically connected to the control system.

3. The high-flow-rate bioaerosol sampler according to claim 1, characterized in that: The liquid replenishment port (32) is located on the air inlet (221).

4. A high-flow-rate bioaerosol sampler according to claim 1, characterized in that: The rotating chamber (22) is movably connected to the fan (21) and the sampling tube (23).

5. A high-flow-rate bioaerosol sampler according to claim 1, characterized in that... The air inlet (221) is equipped with a baffle plate at the air inlet end.

6. A high-flow-rate bioaerosol sampler according to claim 1, characterized in that: A tubular sensor (5) is connected to the connecting pipe between the replenishment pump (33) and the replenishment port (32). The tubular sensor (5) is used to detect whether there is sampling liquid passing through the connecting pipe.

7. A high-flow-rate bioaerosol sampler according to claim 6, characterized in that: An alarm is installed on the body (1), and the alarm is electrically connected to the tubular sensor (5).

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