A biological aerosol sampler

Abstract

The present invention discloses a bioaerosol sampler, which includes an intake pipe, an outlet pipe, a nozzle, and a sampling bottle. The nozzle is provided at the outlet end of the intake pipe. The nozzle includes a hub, the outer diameter of the hub decreases from the middle to both ends, and a plurality of guide vanes arranged at intervals along the circumferential direction are provided on the outer peripheral wall of the hub. The guide vanes extend between the middle of the hub and one of its ends. The air outlet end of the guide vane has an inclination angle α relative to the horizontal plane. The guide vanes, the hub, and the inner wall of the intake pipe enclose an air flow channel, and the area of the air flow channel decreases along the gas flow direction. The intake pipe is connected to the sampling bottle and extends into the sampling bottle. There is a distance h between the outlet end of the intake pipe and the liquid level of the absorption liquid. The outlet pipe is provided at a position above the sampling bottle. This sampler can drive the liquid to form a vortex with a high and stable liquid level, improving the sampling efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and particularly to a bioaerosol sampler. Background Art

[0002] Bioaerosols are particles with biological activity, such as bacteria, viruses, etc. Monitoring bioaerosols is of great significance. However, different from non-active particles such as dust and droplets, bioaerosol particles are extremely likely to lose their activity when hitting the wall surface during the collection process, thus losing the collection significance and having a very low sampling efficiency.

[0003] A liquid cyclone bioaerosol sampler is a device for collecting bioaerosols in a specific environment. Its main principle is to use the action of gas to drive the absorbent liquid in the sampling bottle to rotate, increasing the surface area of the absorbent liquid and attaching it to the inner wall surface of the bottle, so as to reduce the loss caused by particles hitting the wall surface and increase the probability of particles entering the absorbent liquid, thereby improving the sampling efficiency.

[0004] Existing liquid cyclone bioaerosol samplers have the following disadvantages:

[0005] (1) The airflow cannot drive the liquid to form a vortex with a high and stable liquid level well, and the fluctuation is relatively severe, resulting in a low sampling efficiency.

[0006] (2) The nozzle or the sampling bottle is not easy to replace. Since the nozzle structure size is relatively small and the residual particles are not easy to clean, new nozzles or new sampling bottles often need to be replaced during on-site application. If the replacement process is cumbersome, the experimental efficiency is low and the user experience is poor.

[0007] (3) The height of the nozzle cannot be freely adjusted. In actual application, the volume of the absorbent liquid injected by the user is determined according to their concentration requirements. To achieve the best cyclone effect, the height of the nozzle should be adjusted according to the height of the configured absorbent liquid level. If it cannot be freely adjusted, the best sampling effect cannot be achieved.

[0008] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0009] Aiming at the problems pointed out in the background art, the present invention proposes a bioaerosol sampler that can drive the liquid to form a vortex with a high and stable liquid level and improve the sampling efficiency.

[0010] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0011] The present invention provides a bioaerosol sampler, including:

[0012] An intake pipe for the inflow of a gas carrying bioaerosols;

[0013] A sampling bottle for containing an absorption liquid. The intake pipe is connected to the sampling bottle and extends into the sampling bottle. There is a distance h between the outlet end of the intake pipe and the liquid level of the absorption liquid;

[0014] A nozzle provided at the outlet end of the intake pipe. The nozzle includes a hub, the outer diameter of which decreases from the middle to both ends. A plurality of spaced guide vanes are arranged along the circumferential direction on the outer peripheral wall of the hub. The guide vanes extend between the middle of the hub and one of its ends. The outlet end of the guide vane has an inclination angle α with respect to the horizontal plane. The guide vanes, the hub, and the inner wall of the intake pipe enclose a spiral air flow channel. The air flow flowing out of the plurality of air flow channels forms a rotating air flow to drive the absorption liquid in the sampling bottle to form a stable vortex liquid level;

[0015] An outlet pipe for the outflow of the gas in the sampling bottle. The outlet pipe is provided at a position above the sampling bottle.

[0016] In some embodiments of the present application, the area of the air flow channel decreases along the gas flow direction.

[0017] In some embodiments of the present application, the outlet end of the guide vane is flush with the bottom end of the intake pipe, and the lower half of the hub extends into the absorption liquid.

[0018] In some embodiments of the present application, the intake pipe has an upper straight pipe section, a middle conical pipe section, and a lower straight pipe section. The middle conical pipe section is transitionally connected between the upper straight pipe section and the lower straight pipe section. The inner diameter of the upper straight pipe section is smaller than that of the lower straight pipe section. The nozzle is provided at the bottom of the lower straight pipe section.

[0019] In some embodiments of the present application, an anti-overflow ring is provided on the inner wall of the sampling bottle. The anti-overflow ring has a horizontal part and a vertical part extending downward. The horizontal part and the vertical part are arc-transitionally connected. The intake pipe passes through the space surrounded by the vertical part. A gap for gas flow is formed between the intake pipe and the vertical part;

[0020] The nozzle is located below the anti-overflow ring, and the outlet pipe is located above the anti-overflow ring.

[0021] In some embodiments of the present application, an anti-overflow ring is provided on the inner wall of the sampling bottle. The anti-overflow ring is used to prevent the absorption liquid in the sampling bottle from entering the outlet pipe. The nozzle is located below the anti-overflow ring, and the outlet pipe is located above the anti-overflow ring;

[0022] The sampling bottle has an equal-diameter section and a first conical section. The first conical section is located below the equal-diameter section. The anti-overflow ring is arranged on the inner wall of the equal-diameter section. The inner diameter of the first conical section gradually decreases from top to bottom. The liquid level of the absorption liquid and the bottom air outlet end of the intake pipe are both lower than the height position of the first conical section.

[0023] In some embodiments of the present application, the height of the first conical section is n, the taper is β, the height of the equal-diameter section between the first conical section and the anti-overflow ring is N, the diameter is D2, n≥0.5D2, N≥0.5D2, and 30°≤β≤60°.

[0024] In some embodiments of the present application, an anti-overflow ring is arranged on the inner wall of the sampling bottle. The anti-overflow ring is used to prevent the absorption liquid from entering the outlet pipe. The nozzle is located below the anti-overflow ring, and the outlet pipe is located above the anti-overflow ring;

[0025] The sampling bottle has a second conical section and an arc section. The arc section is located below the second conical section. The inner diameter of the second conical section gradually decreases from top to bottom. A necking structure is formed at the connection between the second conical section and the arc section. The anti-overflow ring is located above the necking structure. The liquid level of the absorption liquid and the bottom air outlet end of the intake pipe are both located below the necking structure.

[0026] In some embodiments of the present application, the height of the arc section is n, the radius is R, the height of the second conical section between the arc section and the anti-overflow ring is N, the taper is γ, the top diameter is D2, n≥0.5D2, N≥0.5D2, and γ≥10°.

[0027] In some embodiments of the present application, the sampling bottle includes an upper sampling bottle and a lower sampling bottle. The upper sampling bottle and the lower sampling bottle are detachably connected by threads;

[0028] An installation port is arranged at the top of the upper sampling bottle. The intake pipe is inserted into the installation port. A sealing ring is arranged between the intake pipe and the installation port. The intake pipe can move up and down along the installation port;

[0029] The outlet pipe is connected to the side of the upper sampling bottle, and the outlet pipe is tangent to the outer wall of the upper sampling bottle.

[0030] Compared with the prior art, the advantages and positive effects of the present invention are:

[0031] In the aerosol sampler disclosed in the present application, the nozzle is provided at the bottom air outlet end of the intake pipe, which plays a role in guiding and jetting the gas flow in the intake pipe. A spiral air flow channel is formed between the nozzle and the inner wall of the intake pipe. The air flow ejected from the air flow channel is a rotary air flow. The rotary air flow acts on the absorbent liquid in the sampling bottle, driving the absorbent liquid to rotate to form a vortex with a high and stable liquid level. The inner wall surface of the sampling bottle is wetted through the vortex, so that aerosol particles have a greater chance of entering the absorbent liquid and being collected, rather than being directly discharged with the air flow or losing activity due to hitting the dry inner wall surface of the sampling bottle, thereby improving the sampling efficiency.

[0032] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Structural schematic diagram of the aerosol sampler according to Embodiment 1;

[0035] Figure 2 Top view of the aerosol sampler according to Embodiment 1;

[0036] Figure 3 Cross-sectional view of the aerosol sampler according to Embodiment 1 in the initial state;

[0037] Figure 4 Cross-sectional view of the aerosol sampler according to Embodiment 1 in the working state;

[0038] Figure 5 Cross-sectional view of the lower part of the sampling bottle according to Embodiment 1;

[0039] Figure 6 Cross-sectional view of the aerosol sampler according to Embodiment 2 in the working state;

[0040] Figure 7 Cross-sectional view of the lower part of the sampling bottle according to Embodiment 2;

[0041] Figure 8 Cross-sectional view of the upper part of the sampling bottle according to the embodiment;

[0042] Figure 9 Cross-sectional view of the intake pipe and the nozzle according to the embodiment;

[0043] Figure 10 Schematic structural diagram of a nozzle according to an embodiment;

[0044] Figure 11 Top view of the nozzle according to the embodiment;

[0045] Figure 12 Schematic structural diagram of a hub according to the embodiment;

[0046] Reference numerals:

[0047] 100 - intake pipe, 110 - upper straight pipe section, 120 - middle conical pipe section, 130 - lower straight pipe section;

[0048] 200 - outlet pipe;

[0049] 300 - nozzle, 310 - hub, 320 - guide vane, 330 - air flow channel;

[0050] 400 - sampling bottle, 410 - upper part of the sampling bottle, 411 - first threaded part, 412 - mounting opening, 413 - second equal - diameter section, 420 - lower part of the sampling bottle, 421 - first equal - diameter section, 422 - first conical section, 423 - second conical section, 424 - arc section, 425 - necking structure, 426 - second threaded part, 430 - anti - overflow ring, 431 - horizontal part, 432 - vertical part, 440 - exhaust cavity;

[0051] 500 - air extraction pump;

[0052] 600 - sealing ring;

[0053] 700 - absorption liquid. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0055] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0057] In the description of this application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In this invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0059] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0060] This embodiment discloses a bioaerosol sampler, referring to Figure 1 and Figure 3 , which mainly includes an intake pipe 100, an outlet pipe 200, a nozzle 300, and a sampling bottle 400, etc. The sampling bottle 400 is used to contain an absorption liquid 700.

[0061] The intake pipe 100 is used for the inflow of gas carrying bioaerosol. The intake pipe 100 is connected to the sampling bottle 400 and extends into the sampling bottle 400. There is a distance h between the outlet end of the intake pipe 100 and the liquid level of the absorbent liquid 700. The gas flowing out from the outlet end of the intake pipe 100 reaches the liquid level of the absorbent liquid 700 after a certain distance.

[0062] The outlet pipe 200 is used for the outflow of gas in the sampling bottle 400. The outlet pipe 400 is connected to the sampling bottle 400, and the outlet pipe 200 is arranged at a position above the sampling bottle 400.

[0063] The nozzle 300 is arranged at the bottom outlet end of the intake pipe 100, which plays a role in guiding and jetting the gas flow in the intake pipe 100. The air flow flowing out from the nozzle 300 acts on the absorbent liquid 700, which is used to drive the absorbent liquid in the sampling bottle 400 to form a vortex with a high and stable liquid level. The inner wall surface of the sampling bottle 400 is wetted through the vortex, so that the aerosol particles have a greater chance of entering the absorbent liquid and being collected, rather than being directly discharged with the air flow or losing their activity due to hitting the dry inner wall surface of the sampling bottle, thereby improving the sampling efficiency.

[0064] The outflow state of the gas from the nozzle 300 plays a key role. In this application, an innovative structural design is carried out on the nozzle 300, so that the outflow air flow is a rotary air flow, achieving a cyclone effect, and then driving the absorbent liquid to form a vortex with a high and stable liquid level.

[0065] The structure of the nozzle 300 refers to Figures 10 to 12 , which includes a hub 310. The outer diameter of the hub 310 decreases from the middle to both ends. The hub 310 is in a quasi-elliptical structure with a middle bulge and narrow ends. A plurality of guide vanes 320 are arranged on the outer peripheral wall of the hub 310. The plurality of guide vanes 320 are arranged at intervals along the circumferential direction of the hub 310. The guide vanes 320 extend between the middle of the hub 310 and one of its ends. Specifically, the guide vanes 320 extend between the middle of the hub 310 and the top of the hub 310. The plurality of guide vanes 320 are arranged on the upper half of the hub 310. The bottom outlet end of the guide vane 320 has an inclination angle α with respect to the horizontal plane. α also represents the jet angle when the air flow leaves the nozzle 300 and impacts the liquid level, and should satisfy 30° ≤ α ≤ 60°.

[0066] The guide vanes 320, the hub 310, and the inner wall of the intake pipe 100 enclose a spiral air flow channel 330. The air flow flowing out from the plurality of air flow channels 330 forms a rotary air flow, and the rotary air flow acts on the absorbent liquid to drive the absorbent liquid to rotate to form a stable vortex liquid level.

[0067] Combined with Figure 4 and Figure 6, the rotating air flow flowing out of the nozzle 300 drives the absorption liquid to rotate, generating a stable vortex liquid surface with a height of M. Due to the centrifugal force, the aerosol particles will be thrown towards the inner wall surfaces around the sampling bottle 400 after being ejected from the nozzle 300. Therefore, the ideal vortex liquid surface height should be as high as possible above the nozzle 300 and the wall surface of the sampling bottle 400 should be wetted, so that the particles have a greater chance of entering the absorption liquid and being collected, rather than being directly discharged with the air flow or losing their activity due to hitting the dry wall surface.

[0068] In some embodiments of the present application, the area of the air flow channel 330 decreases along the gas flow direction, enabling the air flow to obtain a better linear acceleration effect when flowing through the nozzle 300, which is beneficial for driving the absorption liquid to rotate, so as to obtain a higher vortex liquid surface and make the height M of the vortex liquid surface higher than the nozzle. The rotating air flow continuously ejects from the nozzle 300, thereby obtaining a vortex with a high and stable liquid surface.

[0069] Combined with Figure 3 and Figure 4 , in the initial state, the liquid surface height of the absorption liquid 700 is m, and there is a distance h between the outlet end of the air inlet pipe 100 (i.e., the outlet end of the nozzle 300 and the outlet end of the air flow channel 330) and the liquid surface of the absorption liquid 700. The rotating air flow flowing out of the air flow channel 330 reaches the absorption liquid after a certain distance, enabling the rotating air flow to fully act on the absorption liquid and drive the absorption liquid to form a vortex. M > h + m, and the vortex covers most of the inner wall of the sampling bottle 400, improving the probability of the aerosol being collected by the absorption liquid and enhancing the sampling efficiency.

[0070] In some embodiments of the present application, referring to Figure 1 , an air extraction pump 500 is provided on the air outlet pipe 200. When the air extraction pump 500 is started, it provides the power for gas flow. The gas carrying the biological aerosol in the environment enters the sampling bottle 400 through the air inlet pipe 100 and the nozzle 300, and then is discharged from the air outlet pipe 200.

[0071] In some embodiments of the present application, referring to Figure 3 and Figure 10 , the outlet end of the guide vane 320 is flush with the bottom end of the air inlet pipe 100, so that the gas flowing out of the air flow channel 330 can directly separate from the air inlet pipe 100 without being blocked by the inner wall of the air inlet pipe 100 to destroy the formed rotating air flow, ensuring the driving and rotating effect of the rotating air flow on the absorption liquid.

[0072] If the outlet end of the guide vane 320 is lower than or higher than the bottom end of the air inlet pipe 100, then the gas flowing out of the air flow channel 330 will surely be blocked by the inner wall of the air inlet pipe 100 or the extended part of the guide vane 320, which will destroy the formed rotating air flow and affect the driving and rotating effect of the rotating air flow on the absorption liquid.

[0073] In some embodiments of the present application, referring toFigure 10 , since the guide vane 320 is provided in the upper half of the hub 310 and there is no structural arrangement in the lower half of the hub 310. In the initial state, referring to Figure 3 , the lower half of the hub 310 extends into the absorption liquid 700. When the rotating air flow flowing out from the air flow channel 330 drives the absorption liquid to rotate, the lower half of the hub 310 plays a certain guiding role for the gas, making the liquid level position opposite to the hub 310 form the center of the vortex liquid level, and improving the formation stability effect of the vortex liquid level.

[0074] In some embodiments of the present application, referring to the reference body 9, the intake pipe 100 has an upper straight pipe section 110, a middle tapered pipe section 120, and a lower straight pipe section 130. The upper straight pipe section 110, the middle tapered pipe section 120, and the lower straight pipe section 130 are of an integral structure. The middle tapered pipe section 120 is transitionally connected between the upper straight pipe section 110 and the lower straight pipe section 130. The inner diameter of the upper straight pipe section 110 is smaller than the inner diameter of the lower straight pipe section 130, and the nozzle 300 is provided at the bottom of the lower straight pipe section 130.

[0075] That is to say, the intake pipe 100 has a structure that is narrow at the upper part and wide at the lower part, which plays a guiding role for the gas. The external gas first enters the upper straight pipe section 110, is guided and transitioned through the middle tapered pipe 120, and enters the lower straight pipe section 130, enabling the gas to diffuse better so as to enter into a plurality of spiral air flow channels 330, which helps to improve the smoothness of the gas flow.

[0076] In some embodiments of the present application, referring to Figure 3 , an anti-overflow ring 430 is provided on the inner wall of the sampling bottle 400. The nozzle 300 is located below the anti-overflow ring 430, and the outlet pipe 200 is located above the anti-overflow ring 430.

[0077] The anti-overflow ring 430 is used to prevent the absorption liquid from entering the outlet pipe 200 and being discharged, so as to avoid abnormal operation of the air extraction pump 500 or additional loss of the absorption liquid.

[0078] As a specific embodiment, the anti-overflow ring 430 has a horizontal portion 431 and a vertical portion 432 extending downward. The horizontal portion 431 and the vertical portion 432 are arc-transitionally connected to guide the gas. The intake pipe 100 passes through the space surrounded by the vertical portion 432, and a gap for gas flow is formed between the intake pipe 100 and the vertical portion 432. The gas in the sampling bottle 400 flows upward through this gap and then flows out from the outlet pipe 200.

[0079] Referring to Figure 3 , the inner diameter of the anti-overflow ring 430 is D1, and the inner diameter of the sampling bottle 400 is D2, and D1≥1 / 3D2, which achieves a better anti-overflow effect and does not affect the discharge flow of the gas at the same time.

[0080] In some embodiments of the present application, the sampling bottle 400 is composed of two parts: the upper part 410 of the sampling bottle and the lower part 420 of the sampling bottle. The upper part 410 of the sampling bottle is detachably connected to the lower part 420 of the sampling bottle by threads. Figure 8 The following is a schematic structural diagram of the upper part 410 of the sampling bottle. Figure 5 The following is a schematic structural diagram of an embodiment of the lower part 420 of the sampling bottle. Figure 7 The following is a schematic structural diagram of another embodiment of the lower part 420 of the sampling bottle.

[0081] Referring to Figure 8 , both the upper and lower ends of the upper part 410 of the sampling bottle are open. An installation port 412 is provided at the top of the upper part 410 of the sampling bottle. The intake pipe 100 is inserted into the installation port 412 to achieve the fixed installation of the intake pipe 100 on the sampling bottle 400. A first thread portion 411 is provided at the bottom of the upper part 410 of the sampling bottle for installing the lower part 420 of the sampling bottle.

[0082] Referring to Figure 5 and Figure 7 , the lower part 420 of the sampling bottle is a liquid-containing container with an open top. A second thread portion 426 is provided at the top of the lower part 420 of the sampling bottle for installing the upper part 410 of the sampling bottle.

[0083] The first thread portion 411 is threadedly connected to the second thread portion 426 to achieve the fixed installation of the upper part 410 of the sampling bottle and the lower part 420 of the sampling bottle. The sampling bottle 400 adopts a split structure with two upper and lower sections. The upper part 410 of the sampling bottle and the lower part 420 of the sampling bottle are connected by threads, which is convenient for the disassembly, assembly and replacement of the sampling bottle 400.

[0084] The intake pipe 100 is inserted into the installation port 412. The intake pipe 100 can move up and down along the installation port 412. A sealing ring 600 is provided between the intake pipe 100 and the installation port 412. While ensuring the sealing effect, the user can freely adjust the height of the intake pipe 100 axially, and it is convenient to replace the new intake pipe 100 after the experiment, greatly improving the user experience.

[0085] In some embodiments of the present application, an anti-overflow ring 430 is provided on the inner wall of the upper part 410 of the sampling bottle. The anti-overflow ring 430 is arranged near the bottom of the upper part 410 of the sampling bottle. Combining Figure 4 , the upper part area of the anti-overflow ring 430 forms an exhaust cavity 440. The outlet pipe 200 is provided on the side of the exhaust cavity 440 and is communicated with the exhaust cavity 440.

[0086] Referring to Figure 2 , the outlet pipe 200 is connected to the side of the upper part 410 of the sampling bottle. The outlet pipe 200 is tangent to the outer wall surface of the upper part 410 of the sampling bottle, so that the swirling direction of the air flow in the exhaust cavity 440 is the same as the swirling direction of the air flow of the nozzle 300. In the present invention, both are clockwise.

[0087] In some embodiments of the present application, Figures 3 to 5 The first specific embodiment structure of the sampling bottle 400 is shown. The sampling bottle 400 has an equal-diameter section and a first conical section 422. The first conical section 422 is located below the equal-diameter section. The anti-overflow ring 430 is provided on the inner wall of the equal-diameter section. The inner diameter of the first conical section 422 gradually decreases from top to bottom. The liquid level of the absorption liquid and the bottom air outlet end of the intake pipe 100 are both lower than the height position of the first conical section 422, that is, h + m < n, where h is the distance between the bottom air outlet of the intake pipe 100 and the absorption liquid in the initial state, m is the liquid level height of the absorption liquid in the initial state, and n is the height of the first conical section 422, so as to obtain a better cyclone disturbance effect.

[0088] When the sampling bottle 400 adopts an upper and lower split structure, refer to Figure 5 , the lower part 420 of the sampling bottle includes a first conical section 422 and a first equal-diameter section 421. Denote the equal-diameter part of the upper part 410 of the sampling bottle shown in Figure 8 as the second equal-diameter section 413. The inner diameters of the first equal-diameter section 421 and the second equal-diameter section 413 are equal, and the two together constitute the equal-diameter section of the sampling bottle 400.

[0089] Furthermore, to obtain a better vortex effect, the height of the equal-diameter section (i.e., the first equal-diameter section 421) between the first conical section 422 and the anti-overflow ring 430 is N, the diameter is D2, the height of the first conical section 422 is n, the taper is β, n ≥ 0.5D2, N ≥ 0.5D2, and 30° ≤ β ≤ 60°.

[0090] In some embodiments of the present application, Figures 6 to 7 The second specific embodiment structure of the sampling bottle 400 is shown. The sampling bottle 400 has a second conical section 423 and an arc section 424. The arc section 424 is located below the second conical section 423. The inner diameter of the second conical section 423 gradually decreases from top to bottom. A necking structure 425 is formed at the connection between the second conical section 423 and the arc section 424. The anti-overflow ring 430 is located above the necking structure 425. The liquid level of the absorption liquid and the bottom air outlet end of the intake pipe 100 are both located below the necking structure 425, so as to obtain a better cyclone disturbance effect.

[0091] When the sampling bottle 400 adopts an upper and lower split structure, the second conical section 423 is the upper half structure of the lower part 420 of the sampling bottle. To obtain a better vortex effect, the height of the second conical section 423 is N, the taper is γ, the top diameter is D2, the height of the arc section 424 is n, the radius is R, n ≥ 0.5D2, N ≥ 0.5D2, γ ≥ 10°, and γ ≥ 10° can prevent the liquid from being sucked out of the bottle.

[0092] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0093] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A bioaerosol sampler, characterized in that, Comprising: An intake pipe for the inflow of gas carrying bioaerosol; A sampling bottle for containing an absorption liquid, the intake pipe being connected to the sampling bottle and extending into the sampling bottle, with a distance h between the outlet end of the intake pipe and the liquid level of the absorption liquid; A nozzle provided at the outlet end of the intake pipe, the nozzle including a hub, the outer diameter of the hub decreasing from the middle to both ends, a plurality of spaced guide vanes being provided on the outer peripheral wall of the hub along its circumferential direction, the guide vanes extending between the middle and one end of the hub, the outlet end of the guide vane having an inclination angle α with respect to the horizontal plane, the guide vanes, the hub, and the inner wall of the intake pipe enclosing a spiral air flow channel, and the air flows flowing out from the plurality of air flow channels forming a swirling air flow to drive the absorption liquid in the sampling bottle to form a stable swirling liquid level; An outlet pipe for the outflow of gas in the sampling bottle, the outlet pipe being provided at a position above the sampling bottle; The area of the air flow channel decreases along the gas flow direction; The outlet end of the guide vane is flush with the bottom end of the intake pipe, and the lower half of the hub extends into the absorption liquid.

2. The bioaerosol sampler according to claim 1, characterized in that The intake pipe has an upper straight pipe section, a middle tapered pipe section, and a lower straight pipe section, the middle tapered pipe section being transitionally connected between the upper straight pipe section and the lower straight pipe section, the inner diameter of the upper straight pipe section being smaller than the inner diameter of the lower straight pipe section, and the nozzle being provided at the bottom of the lower straight pipe section.

3. The bioaerosol sampler according to claim 1, characterized in that An anti-overflow ring is provided on the inner wall of the sampling bottle, the anti-overflow ring having a horizontal portion and a vertical portion extending downward, the horizontal portion and the vertical portion being arc-transitionally connected, the intake pipe passing through the space surrounded by the vertical portion, and a gap for gas flow being formed between the intake pipe and the vertical portion; The nozzle is located below the anti-overflow ring, and the outlet pipe is located above the anti-overflow ring.

4. The bioaerosol sampler according to claim 1, characterized in that An anti-overflow ring is provided on the inner wall of the sampling bottle, the anti-overflow ring being used to prevent the absorption liquid in the sampling bottle from entering the outlet pipe, the nozzle being located below the anti-overflow ring, and the outlet pipe being located above the anti-overflow ring; The sampling bottle has an equal-diameter section and a first conical section, the first conical section being located below the equal-diameter section, the anti-overflow ring being provided on the inner wall of the equal-diameter section, the inner diameter of the first conical section gradually decreasing from top to bottom, and the liquid level of the absorption liquid and the bottom outlet end of the intake pipe are both lower than the height position of the first conical section.

5. The bioaerosol sampler according to claim 4, characterized in that The height of the first conical section is n, the taper is β, the height of the equal-diameter section between the first conical section and the anti-overflow ring is N, the diameter is D2, n≥0.5D2, N≥0.5D2, and 30°≤β≤60°.

6. The bioaerosol sampler according to claim 1, characterized in that An anti-overflow ring is provided on the inner wall of the sampling bottle. The anti-overflow ring is used to prevent the absorption liquid from entering the outlet pipe. The nozzle is located below the anti-overflow ring, and the outlet pipe is located above the anti-overflow ring. The sampling bottle has a second conical section and an arc section. The arc section is located below the second conical section. The inner diameter of the second conical section gradually decreases from top to bottom. A necking structure is formed at the connection between the second conical section and the arc section. The anti-overflow ring is located above the necking structure. The liquid level of the absorption liquid and the bottom air outlet end of the inlet pipe are both located below the necking structure.

7. The bioaerosol sampler according to claim 6, wherein The height of the arc section is n, the radius is R. The height of the second conical section between the arc section and the anti-overflow ring is N, the taper is γ, and the top diameter is D2. n ≥ 0.5D2, N ≥ 0.5D2, γ ≥ 10°.

8. The bioaerosol sampler according to any one of claims 1 to 7, wherein The sampling bottle includes an upper sampling bottle and a lower sampling bottle. The upper sampling bottle and the lower sampling bottle are detachably connected by threads. An installation opening is provided at the top of the upper sampling bottle. The inlet pipe is inserted into the installation opening. A sealing ring is provided between the inlet pipe and the installation opening. The inlet pipe moves up and down along the installation opening. The outlet pipe is connected to the side of the upper sampling bottle, and the outlet pipe is tangent to the outer wall surface of the upper sampling bottle.

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