A large flow biological aerosol sampling device with adjustable flow

Abstract

The utility model relates to a big flow biological sol of adjustable flow sampling device, including air filter body and sampling mechanism, the upper end of air filter body is equipped with the air inlet, air filter body lower extreme is equipped with the air outlet, the air outlet is linked with the air pump, still be equipped with screen between the air inlet and air outlet, sampling mechanism sets up in the below of screen, sampling mechanism includes sampling cotton. The utility model can effectively solve the problem that the existing agar plate sampling device is in the long -time sampling process because of the airflow impact and leads to the culture medium water loss, cannot gather virus and the problem that the detection range is limited, and sampling efficiency is high, and sampling effect is good.

Description

Technical Field

[0001] This utility model relates to the field of biosol utilization technology, and in particular to a high-flow-rate biosol sampling device with adjustable flow rate. Background Technology

[0002] Nature contains a large number of microbial aerosols, among which microbial aerosols with a particle size of 0.1~10.0μm are closely related to human health. There are many types of aerosol sampling methods in the air, depending on the application scenario and target microorganisms, among which the most commonly used sampling form is the impactor sampler.

[0003] An impactor sampler is an aerosol sampling device that uses inertia to accelerate bioaerosol particles onto the surface of a solid medium through nozzles, orifices, or slits. Impactor samplers are generally divided into sieve-type and slit-type, the main difference being the shape of the nozzle, orifice, or slit through which the aerosol passes, and the sampling flow rate corresponding to different shapes also varies. The Anderson sampler is the most common sieve-type sampler, using stacked sieves with different pore sizes to collect aerosol particles of different sizes, with a typical operating flow rate of 28.3 L / min. As a reliable airborne microbial sampler, the Anderson sampler is recommended as the standard airborne microbial sampler by the International Conference on Microbiology and the American Government Industrial Hygiene Association, and it is also the most widely used airborne microbial sampler. This sampler directly collects airborne bacteria onto nutrient agar plates, which can be directly cultured after sampling. The number of colonies formed on the culture medium can be used to infer the number of airborne bacteria at the time of sampling. However, this sampler cannot operate for extended periods, otherwise the impact of the airflow will cause excessive water loss from the nutrient agar plates.

[0004] Furthermore, since viruses must multiply inside cells, the Anderson sampler using agar plates cannot effectively culture viral spots; it can only culture bacteria. Because the concentration of nutrient agar is fixed, the number of colonies cultured is also limited to a certain range. Therefore, it can only detect the number of microorganisms within a specific concentration range and cannot detect excessively high or low concentrations of microorganisms.

[0005] Therefore, it is necessary to develop a high-flow-rate biosol sampling device with adjustable flow rate to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a high-flow-rate biosol sampling device with adjustable flow rate, which can effectively solve the problems of existing agar plate sampling devices causing water loss of culture medium, inability to collect viruses and limited detection range due to airflow impact during long-term sampling.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A high-flow-rate biosol sampling device with adjustable flow rate includes an air filter body and a sampling mechanism. The upper end of the air filter body is provided with an air inlet, and the lower end of the air filter body is provided with an air outlet. The air outlet is connected to an air pump. A screen is also provided between the air inlet and the air outlet. The sampling mechanism is located below the screen and includes sampling cotton.

[0008] The beneficial effects of this invention are as follows: the sieve can not only perform preliminary filtration of large particulate impurities in the sampled airflow, but also homogenize the airflow impacting the sampling cotton, so that all parts of the sampling cotton can fully adsorb aerosols. Moreover, the multi-fiber structure of the sampling cotton has a large surface area and good adsorption performance, which can efficiently capture various biosol particles (including bacteria and viruses), and will not affect the capture effect of aerosol particles due to excessive water loss caused by airflow impact. This greatly improves the sampling efficiency and sampling diversity of air biosols, and effectively solves the problems of existing agar plate sampling devices causing water loss of culture medium, inability to collect viruses and limited detection range during long-term sampling due to airflow impact.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, an airflow direction control mechanism is provided at the air inlet. The airflow direction control mechanism includes a cover fixed above the air inlet. The top wall of the cover is connected to the top wall of the air inlet by a support rod to form a top air intake channel. The edge of the cover extends vertically downward to form an annular baffle. The bottom of the annular baffle extends horizontally inward and forms an annular air intake channel communicating with the top air intake channel between it and the outer wall of the air inlet.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the airflow direction control mechanism effectively changes the flow direction of the gas entering the air inlet by utilizing the inverted U-shaped air intake structure formed by the cover and the annular baffle, so that the airflow to be sampled changes its flow direction rapidly before entering the air inlet, thereby preventing large particulate impurities mixed inside from entering the air inlet due to inertia. Thus, the initial filtration of large particulate impurities in the airflow to be sampled is achieved, ensuring higher air purity entering the air filter body and greatly reducing the cleaning frequency of the air filter body and the screen.

[0012] Furthermore, the upper edge of the air inlet extends horizontally outward and then vertically downward to form a lower edge groove between itself and the outer wall of the air inlet. The width of the lower edge groove is greater than or equal to the width of the annular air intake channel.

[0013] The beneficial effects of adopting the above-mentioned further scheme are as follows: When the airflow enters the annular air intake channel from the outside under the action of negative pressure, it undergoes a turn. After the airflow turns once and enters the annular air intake channel, it will directly impact the lower edge groove. Since the opening of the lower edge groove faces downward and the width of the lower edge groove is greater than or equal to the width of the annular air intake channel, the airflow will completely impact the lower edge groove. Large particles of impurities enter the lower edge groove due to inertia and adhere to the lower edge groove under the obstruction of the lower edge groove, or be ejected downward and fall outside the air filter body. The airflow will continue to enter the top air intake channel from one side of the lower edge groove under the action of negative pressure, achieving a second turn. During the second turn, the airflow will again undergo inertial separation due to the sudden change in direction. The remaining large particles of impurities will be further separated, preventing them from entering the air filter body with the airflow, ensuring higher purity of the airflow entering the air filter body, and also preventing large particles of impurities from entering the air filter body and causing screen blockage, thus affecting the sampling efficiency.

[0014] Furthermore, a guide plate is provided between the screen and the sampling cotton. The guide plate has a conical structure, with the upper opening diameter matching the outer diameter of the screen and the lower opening narrowing to form a slit facing the center area of ​​the sampling cotton.

[0015] The beneficial effect of adopting the above-mentioned further scheme is that the guide plate uses its lower constricted opening to achieve the gathering and guidance of airflow, so that the airflow concentrates and impacts the central area of ​​the sampling cotton, ensuring that the biosol in the airflow is fully captured by the sampling cotton.

[0016] Furthermore, the lower opening of the guide plate is a long, narrow slit, and the projection of the long, narrow slit onto the sampling cotton is located on the central axis of the sampling cotton.

[0017] The beneficial effects of adopting the above-mentioned further scheme are: the design of the elongated slit allows the airflow to form a concentrated jet when it passes through, which effectively enhances the penetration and impact concentration of the airflow on the sampling cotton, making it easier for biosol particles to deposit in the deep layers of the sampling cotton fibers and improving the capture efficiency; at the same time, the projection of the slit on the sampling cotton is located on the central axis, ensuring symmetrical airflow distribution and concentrated sampling area, avoiding sampling deviation caused by edge effects, and further improving sampling accuracy and representativeness.

[0018] Furthermore, the inner wall of the air filter body is provided with a screen support part for supporting the screen. The screen support part is a ring boss or a plurality of support blocks arranged in a ring array. The screen is detachably installed on the screen support part.

[0019] The beneficial effects of adopting the above-mentioned further solution are: the screen support part is used to support the screen and realize the detachable installation between it and the screen by means of bolt fixing, snap-fit, etc., which facilitates the regular cleaning or replacement of the screen and effectively extends the service life of the air filter body.

[0020] Furthermore, the screen has a plurality of circular through holes evenly distributed on it, each of which is a conical hole, and the diameter of the circular through hole facing the air inlet is larger than the diameter facing the air outlet.

[0021] The beneficial effects of adopting the above-mentioned further scheme are: the large end of the circular through hole faces the air inlet side and the small end faces the air outlet side, forming a tapered structure, which creates an acceleration effect when the airflow passes through, and can enhance the inertial capture effect of small particles; at the same time, the tapered structure also reduces airflow disturbance, avoids particle escape caused by eddy currents, and further ensures the continuity and uniformity of sampling efficiency.

[0022] Furthermore, the sampling cotton is connected to the air filter body through a sampling tube. The sampling tube is provided with a loading groove for loading the sampling cotton. The air filter body is provided with a mounting hole that matches the sampling tube. A limiter is provided on the side of the mounting hole near the insertion end of the sampling tube. The limiter is opposite to the limiting groove at the insertion end of the sampling tube.

[0023] The beneficial effects of adopting the above-mentioned further solution are as follows: the sampling tube uses the loading groove to position the sampling cotton, avoiding displacement or loosening of the sampling cotton during the sampling process, ensuring that the sampling cotton is always in the central area of ​​the airflow impact, and the limiter is used to control the direction of the sampling tube so that the sampling surface of the sampling cotton is always perpendicular to the airflow direction, further ensuring that the sampling cotton is always in the central area of ​​the airflow impact, effectively ensuring the maximum sampling area and uniform force of the sampling cotton, and effectively avoiding poor sampling effect due to the tilting of the sampling cotton.

[0024] Furthermore, the sampling tube is provided with a magnet at one end with a limiting groove, and a Hall switch is provided on the side of the mounting hole opposite to the magnet.

[0025] The beneficial effects of adopting the above-mentioned further solution are: the magnet and the Hall switch work together to realize the automatic sensing of the sampling tube installation. When the sampling tube is fully inserted and the limiting groove is engaged with the limiter, the magnetic field triggers the Hall switch signal, which is fed back to the control system to confirm that the component is assembled correctly. This effectively prevents sampling failure due to improper installation and improves the automation level and operational reliability of the equipment.

[0026] Furthermore, it also includes a touch screen for adjusting the flow rate, and both the touch screen and the air pump are electrically connected to the control circuit board.

[0027] The beneficial effects of adopting the above-mentioned further solution are as follows: The control circuit board allows for real-time adjustment of the air pump's operating parameters, thereby precisely controlling the sampling flow rate to adapt to sampling needs in different environments, improving sampling accuracy and flexibility. The control circuit board, based on external commands input through the touchscreen, enables the adjustment of air pump parameters, allowing the entire device to dynamically adjust airflow speed and sampling duration according to actual sampling requirements, providing an intelligent and precise sampling mode. Simultaneously, the touchscreen interface intuitively displays key parameters such as current flow rate, running time, and battery status, facilitating real-time monitoring and operation by the user, significantly improving the human-machine interface experience and on-site operational efficiency. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural diagram of a high-flow-rate biosol sampling device with adjustable flow rate according to the present invention; Figure 2 for Figure 1 A magnified view of part A in the diagram; Figure 3 This is a schematic diagram of the sieve structure in a high-flow-rate biosol sampling device with adjustable flow rate according to this utility model; Figure 4 This is a cross-sectional schematic diagram of the guide plate in a high-flow-rate biosol sampling device with adjustable flow rate according to this utility model; Figure 5 This is a schematic diagram showing the connection between the touch screen, air pump, and control circuit board in a high-flow-rate biosol sampling device with adjustable flow rate according to this utility model.

[0029] The attached diagram lists the components represented by each number as follows: 1. Air filter body; 2. Sampling mechanism; 21. Sampling cotton; 22. Sampling tube; 23. Loading slot; 3. Air inlet; 4. Air outlet; 5. Screen; 51. Circular through hole; 6. Airflow direction control mechanism; 61. Cover; 62. Top air inlet channel; 63. Annular baffle; 64. Annular air inlet channel; 65. Lower edge groove; 66. Support rod; 7. Guide plate; 71. Slit; 8. Screen support part; 9. Mounting hole; 10. Limiter; 11. Limiting groove; 12. Magnet; 13. Hall switch; 14. Air pump; 15. Touch screen; 16. Control circuit board. Detailed Implementation

[0030] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Example 1 like Figure 1 As shown, this embodiment provides a high-flow-rate biosol sampling device with adjustable flow rate, including an air filter body 1 and a sampling mechanism 2. The upper end of the air filter body 1 is provided with an air inlet 3, and the lower end of the air filter body 1 is provided with an air outlet 4. The air outlet 4 is connected to an air pump 14. A screen 5 is also provided between the air inlet 3 and the air outlet 4. The sampling mechanism 2 is located below the screen 5 and includes a sampling cotton 21.

[0034] In this embodiment, the air pump 14 creates a negative pressure inside the air filter body 1, allowing the airflow to be sampled to enter through the air inlet 3 of the air filter body 1. After passing through the screen 5, the airflow directly impacts the sampling cotton 21 below it, causing the biosols in the airflow to be filtered out and retained on the sampling cotton 21. The filtered airflow is then discharged through the air outlet 4. The screen 5 not only performs preliminary filtration of large particulate impurities in the airflow to be sampled, but also homogenizes the airflow impacting the sampling cotton 21, ensuring that all parts of the sampling cotton 21 can fully adsorb aerosols. Furthermore, the multi-fiber structure of the sampling cotton 21 has a large surface area and good adsorption performance, enabling it to efficiently capture various biosol particles (including bacteria and viruses) without excessive water loss due to airflow impact, which would affect the capture effect of aerosol particles. This greatly improves the sampling efficiency and sampling diversity of air biosols, effectively solving the problems of existing agar plate sampling devices where the culture medium loses water due to airflow impact during long-term sampling, making it impossible to collect viruses and limiting the detection range.

[0035] Example 2 like Figure 1 and Figure 2As shown, based on Embodiment 1, in this embodiment, the air inlet 3 is provided with an airflow direction control mechanism 6. The airflow direction control mechanism 6 includes a cover 61 fixed above the air inlet 3. The inner top wall of the cover 61 is connected to the top wall of the air inlet 3 by a support rod 66 to form a top air intake channel 62. The edge of the cover 61 extends vertically downward to form an annular baffle 63. The bottom of the annular baffle 63 extends horizontally inward and forms an annular air intake channel 64 that communicates with the top air intake channel 62 between it and the outer wall of the air inlet 3.

[0036] In this embodiment, the airflow direction control mechanism 6 effectively changes the flow direction of the gas entering the air inlet by utilizing the inverted U-shaped air intake structure formed by the cover 61 and the annular baffle 63. This causes the airflow to be sampled to change its flow direction rapidly before entering the air inlet 3, so that large particulate impurities mixed inside cannot enter the air inlet 3 due to inertia. Thus, the initial filtration of large particulate impurities in the airflow to be sampled is achieved, ensuring higher air purity entering the air filter body and greatly reducing the cleaning frequency of the air filter body 1 and the screen 5.

[0037] Example 3 like Figure 2 As shown, based on Embodiment 2, in this embodiment, the upper edge of the air inlet 3 extends horizontally outward and then vertically downward to form a lower edge groove 65 between it and the outer wall of the air inlet 3. The width of the lower edge groove 65 is greater than or equal to the width of the annular air intake channel 64.

[0038] In this embodiment, the airflow undergoes a first turn when entering the annular intake channel 64 from the outside under negative pressure. After the airflow undergoes this first turn and enters the annular intake channel 64, it directly impacts the lower edge groove 65. Since the opening of the lower edge groove 65 faces downward and the width of the lower edge groove 65 is greater than or equal to the width of the annular intake channel 64, the airflow will completely impact the lower edge groove 65. Large particles of impurities enter the lower edge groove 65 due to inertia and adhere to it under the obstruction of the lower edge groove 65, or be ejected downward and fall outside the air filter body 1. The airflow continues to enter the top intake channel 62 from one side of the lower edge groove 65 under negative pressure, achieving a second turn. During the second turn, the airflow undergoes another inertial separation due to the sudden change in direction, and the remaining large particles of impurities are further separated, preventing them from entering the air filter body 1 with the airflow. This ensures that the airflow entering the air filter body 1 has higher purity and also prevents large particles of impurities from entering the air filter body 1 and causing the screen 5 to become clogged, thus affecting the sampling efficiency.

[0039] Example 4 like Figure 1As shown, based on Embodiment 3, in this embodiment, a guide plate 7 is provided between the screen 5 and the sampling cotton 21. The guide plate 7 has a conical structure, with the upper opening diameter matching the outer diameter of the screen 5, and the lower opening narrowing to form a slit 71 facing the central area of ​​the sampling cotton 21.

[0040] In this embodiment, the guide plate 7 uses its constricted opening at the lower end to gather and guide the airflow, so that the airflow concentrates and impacts the central area of ​​the sampling cotton 21, ensuring that the biosol in the airflow is fully captured by the sampling cotton.

[0041] Example 5 like Figure 4 As shown, based on Embodiment 4, in this embodiment, the lower opening of the guide plate 7 is a long strip slit, and the projection of the long strip slit on the sampling cotton 21 is located on the central axis of the sampling cotton 21.

[0042] In this embodiment, the design of the elongated slit allows the airflow to form a concentrated jet, effectively enhancing the penetration and impact concentration of the airflow on the sampling cotton 21. This makes it easier for biosol particles to deposit deep into the fibers of the sampling cotton 21, improving the capture efficiency. At the same time, the projection of the slit on the sampling cotton 21 is located on the central axis, ensuring symmetrical airflow distribution and concentrated sampling area, avoiding sampling deviation caused by edge effects, and further improving sampling accuracy and representativeness.

[0043] Example 6 like Figure 1 Based on embodiment 5, in this embodiment, the inner wall of the air filter body 1 is provided with a screen support part 8 for supporting the screen 5. The screen support part 8 is a ring boss or a plurality of support blocks arranged in a ring array. The screen 5 is detachably installed on the screen support part 8.

[0044] In this embodiment, the screen support part 8 is used to support the screen 5 and to enable detachable installation between the screen 5 and the screen 5 by means of bolt fixing, snap-fitting, etc., which facilitates the regular cleaning or replacement of the screen 5 and effectively extends the service life of the air filter body 1.

[0045] Example 7 like Figure 3 As shown, based on embodiment 6, in this embodiment, the screen 5 has a plurality of circular through holes 51 evenly distributed on it. Each of the circular through holes 51 is a conical hole, and the diameter of the circular through hole 51 facing the air inlet 3 is larger than the diameter facing the air outlet 4.

[0046] In this embodiment, the large end of the circular through-hole 51 faces the air inlet side and the small end faces the air outlet side, forming a tapered structure. When the airflow passes through, it creates an acceleration effect, which can enhance the inertial capture effect of small particles. At the same time, the tapered structure also reduces airflow disturbance and avoids particle escape caused by eddy currents, further ensuring the continuity and uniformity of sampling efficiency.

[0047] Example 8 like Figure 1 As shown, based on Embodiment 7, in this embodiment, the sampling cotton 21 is connected to the air filter body 1 through the sampling tube 22. The sampling tube 22 is provided with a loading groove 23 for loading the sampling cotton 21. The air filter body 1 is provided with a mounting hole 9 that matches the sampling tube 22. A limiter 10 is provided on the side of the mounting hole 9 away from the insertion end of the sampling tube 22. The limiter 10 is opposite to the limiting groove 11 at the end of the sampling tube 22.

[0048] In this embodiment, the sampling tube 22 uses the loading groove 23 to position the sampling cotton 21, preventing the sampling cotton 21 from shifting or loosening during the sampling process. This ensures that the sampling cotton 21 is always in the central area of ​​the airflow impact. The limiter 10 can be a limit block or limit rod that matches the limit groove 11, used to cooperate with the limit groove 11 to achieve circumferential positioning of the sampling tube 22, thereby controlling the direction of the sampling tube 22 and ensuring that the sampling surface of the sampling cotton 21 is always perpendicular to the airflow direction. This further ensures that the sampling cotton 21 is always in the central area of ​​the airflow impact, effectively maximizing the sampling area of ​​the sampling cotton 21 and ensuring uniform force distribution. This effectively avoids poor sampling results due to the tilting of the sampling cotton 21.

[0049] Example 9 like Figure 1 As shown, based on embodiment 8, in this embodiment, the sampling tube 22 is provided with a magnet 12 at one end of the limiting groove 11, and a Hall switch 13 is provided on the side of the mounting hole 9 opposite to the magnet 12.

[0050] In this embodiment, the magnet 12 and the Hall switch 13 work together to realize the automatic sensing of the sampling tube 22 being installed in place. When the sampling tube 22 is fully inserted and the limiting groove 11 is engaged with the limiter 10, the magnetic field triggers the Hall switch 13 signal, which is fed back to the control system to confirm that the component is assembled correctly. This effectively prevents sampling failure caused by improper installation and improves the automation level and operational reliability of the equipment.

[0051] Example 10 like Figure 5 As shown, based on embodiment 9, this embodiment also includes a touch screen 15 for adjusting the flow rate, and both the touch screen 15 and the air pump 14 are electrically connected to the control circuit board 16.

[0052] In this embodiment, the control circuit board 16 can adjust the operating parameters of the air pump 14 in real time, thereby precisely controlling the sampling flow rate to adapt to sampling needs in different environments, improving sampling accuracy and flexibility. The control circuit board 16 adjusts the air pump parameters based on external commands input through the touchscreen 15, enabling the entire device to dynamically adjust the airflow speed and sampling duration according to actual sampling needs, providing an intelligent and precise sampling mode. Simultaneously, the touchscreen 15 interface can intuitively display key parameters such as current flow rate, running time, and battery status, facilitating real-time monitoring and operation by the user, significantly improving the human-machine interaction experience and on-site operational efficiency.

[0053] The working principle of this utility model is as follows: During sampling, the air pump 14 is first started, which creates a negative pressure inside the air filter body 1, allowing the airflow to be sampled to enter through the air inlet 3 of the air filter body 1. The airflow direction control mechanism 6 set at the air inlet 3 effectively changes the flow direction of the gas entering the air inlet 3 by utilizing the inverted U-shaped air intake structure formed by the cover 61 and the annular baffle 63. This causes the airflow to be sampled to rapidly change its flow direction before entering the air inlet 3, thus preventing large particulate impurities mixed inside from entering the air inlet 3 due to inertia. Therefore, the initial filtration of large particulate impurities in the airflow to be sampled is achieved, ensuring that the airflow enters the air filter body. The air purity inside the main body 1 is higher, which greatly reduces the cleaning frequency of the air filter main body 1 and the screen. Specifically, when the airflow enters the annular intake channel 64 from the outside under negative pressure, it undergoes a turn. After the airflow turns and enters the annular intake channel 64, it directly impacts the lower edge groove 65. Since the opening of the lower edge groove 65 faces downward, and the width of the lower edge groove 65 is greater than or equal to the width of the annular intake channel 64, the airflow will completely impact the lower edge groove 65. Large particles of impurities enter the lower edge groove 65 due to inertia and adhere to the lower edge groove 65 under the blocking effect of the lower edge groove 65, or be ejected downward and fall onto the air filter main body. 1. Outside; while the airflow continues to enter the top air intake channel 62 from one side of the lower groove 65 under negative pressure, achieving a second turn. During the second turn, the airflow undergoes inertial separation again due to the sudden change in direction, and the remaining large particulate impurities are further separated, preventing them from entering the air filter body 1 with the airflow, ensuring higher purity of the airflow entering the air filter body 1. The airflow entering the air filter body 1 passes through the screen 5 and directly impacts the sampling cotton 21 below it, causing the biosol in the airflow to be sampled to be filtered out and left on the sampling cotton 21. The filtered airflow is then discharged through the air outlet 4; whereby the screen 5 can not only filter the biosol in the airflow to be sampled, but also... The sampling cotton 21 can perform preliminary filtration of large particulate impurities in the sample airflow and homogenize the airflow of the sampling cotton 21, so that all parts of the sampling cotton 21 can fully adsorb aerosols. The multi-fiber structure of the sampling cotton 21 has a large surface area and good adsorption performance, which can efficiently capture various biosol particles (including bacteria and viruses) without affecting the capture effect of aerosol particles due to excessive water loss caused by airflow impact. This greatly improves the sampling efficiency and sampling diversity of air biosols and effectively solves the problems of existing agar plate sampling devices that cause water loss of culture medium, inability to collect viruses and limited detection range during long-term sampling due to airflow impact.

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-flow-rate biosol sampling device with adjustable flow rate, characterized in that, It includes an air filter body (1) and a sampling mechanism (2). The upper end of the air filter body (1) is provided with an air inlet (3) and the lower end of the air filter body (1) is provided with an air outlet (4). The air outlet (4) is connected to an air pump (14). A screen (5) is also provided between the air inlet (3) and the air outlet (4). The sampling mechanism (2) is located below the screen (5). The sampling mechanism (2) includes a sampling cotton (21).

2. The adjustable flow rate high-flow-rate biosol sampling device according to claim 1, characterized in that, An airflow direction control mechanism (6) is provided at the air inlet (3). The airflow direction control mechanism (6) includes a cover (61) fixed above the air inlet (3). The top wall of the cover (61) is connected to the top wall of the air inlet (3) by a support rod (66) to form a top air intake channel (62). The edge of the cover (61) extends vertically downward to form an annular baffle (63). The bottom of the annular baffle (63) extends horizontally inward and forms an annular air intake channel (64) that communicates with the top air intake channel (62) between the outer wall of the air inlet (3).

3. The adjustable flow rate high-flow-rate biosol sampling device according to claim 2, characterized in that, The upper edge of the air inlet (3) extends horizontally outward and then vertically downward to form a lower edge groove (65) between the upper edge and the outer wall of the air inlet (3). The width of the lower edge groove (65) is greater than or equal to the width of the annular air intake channel (64).

4. The adjustable flow rate high-flow-rate biosol sampling device according to claim 1, characterized in that, A guide plate (7) is provided between the screen (5) and the sampling cotton (21). The guide plate (7) has an inverted conical structure. The diameter of its upper opening is adapted to the outer diameter of the screen (5), and its lower opening narrows to form a slit (71) which is directly opposite the center area of ​​the sampling cotton (21).

5. The adjustable flow rate high-flow-rate biosol sampling device according to claim 4, characterized in that, The lower opening of the guide plate (7) is a long strip slit, and the projection of the long strip slit on the sampling cotton (21) is located on the central axis of the sampling cotton (21).

6. The adjustable flow rate high-flow-rate biosol sampling device according to claim 1, characterized in that, The inner wall of the air filter body (1) is provided with a screen support part (8) for supporting the screen (5). The screen support part (8) is a ring boss or a plurality of support blocks arranged in a ring array. The screen (5) is detachably installed on the screen support part (8).

7. The adjustable flow rate high-flow-rate biosol sampling device according to claim 1, characterized in that, The screen (5) has a plurality of circular through holes (51) evenly distributed on it. Each circular through hole (51) is a conical hole. The diameter of the circular through hole (51) facing the air inlet (3) is larger than the diameter facing the air outlet (4).

8. The adjustable flow rate high-flow-rate biosol sampling device according to claim 1, characterized in that, The sampling cotton (21) is connected to the air filter body (1) through the sampling tube (22). The sampling tube (22) is provided with a loading groove (23), and the sampling cotton (21) is installed in the loading groove (23). The air filter body (1) is provided with an installation hole (9) that matches the sampling tube (22). The installation hole (9) is provided with a limiter (10) on the side near the insertion end of the sampling tube (22). The limiter (10) is opposite to the limiting groove (11) at the insertion end of the sampling tube (22).

9. The adjustable flow rate high-flow-rate biosol sampling device according to claim 8, characterized in that, The sampling tube (22) is provided with a magnet (12) at one end of the limiting groove (11), and a Hall switch (13) is provided on the side of the mounting hole (9) opposite to the magnet (12).

10. A high-flow-rate biosol sampling device with adjustable flow rate according to any one of claims 1 to 9, characterized in that, It also includes a touch screen (15) for adjusting the flow rate, and both the touch screen (15) and the air pump (14) are electrically connected to the control circuit board (16).

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