Sampling head and sampling method of online pollen bioaerosol detection equipment

Abstract

The invention provides a sampling head and a sampling method of online pollen bioaerosol detection equipment, and relates to the technical field of pollen bioaerosol sampling. The sampling head of the on-line pollen biological aerosol detection equipment comprises an outer cover, a separation cylinder, an upper cover plate and a sampling tube, the upper end face of the separation cylinder is provided with a top side special-shaped end face, and a funnel-shaped cyclone chamber is arranged at a cylinder body of the separation cylinder; the upper cover plate is coaxially connected to the separation cylinder in a pressed mode, an exhaust pipe is arranged at the axis of the upper cover plate, a bottom side special-shaped end face is arranged on the lower end face of the upper cover plate, a spiral-flow type gas flow channel is formed between the bottom side special-shaped end face and the top side special-shaped end face, one end of the sampling pipe is inserted into the exhaust pipe, and the other end of the sampling pipe is inserted into the top side special-shaped end face. The pollen biological aerosol in the air can be collected in the circumferential direction of the sampling head by utilizing the spiral-flow type gas flow channel, so that the collection efficiency is ensured, and the sampling head is prevented from being influenced by the wind direction.

Description

Technical Field

[0001] The present application relates to the technical field of pollen bioaerosol sampling, and in particular to a sampling head and a sampling method of an online pollen bioaerosol detection device. Background Art

[0002] With the continuous changes in global climate change and ecological environment, pollen bioaerosol allergy has become an increasingly serious health problem. Therefore, accurate and efficient monitoring and sampling of pollen bioaerosols are of great significance for studying the causes of pollen bioaerosol allergy, predicting pollen bioaerosol seasons, and formulating effective preventive measures.

[0003] Pollen bioaerosol is different from other aerosols. First, the particle size of pollen bioaerosol is in the range of 5-100um, and the vast majority is in the range of 20-50um, which is larger than other aerosol particles and has a shorter suspension time in the air. Second, as a biological organism, pollen bioaerosol often has sticky substances such as sugars, proteins, and plant oils on its surface, which can easily adhere to the sampling equipment, thus affecting the sampling efficiency. Third, due to the weight and viscosity of pollen bioaerosol, the collection direction and wind direction also have a great influence on the sampling efficiency. In addition, the air contains some large particles such as dust (above 100um), which can easily contaminate the sampling equipment and affect the sampling effect.

[0004] Therefore, there is an urgent need for an online pollen bioaerosol detection equipment sampling head that is not affected by wind direction, directly samples the air, filters out particles larger than 100um, and has low wall loss. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a sampling head for an online pollen bioaerosol detection device, including an outer cover, a separation cylinder, an upper cover plate and a sampling tube, wherein the separation cylinder is sealed and embedded in the outer cover, the upper end face of the separation cylinder is provided with a top side special-shaped end face, and the barrel of the separation cylinder is provided with a funnel-shaped cyclone chamber; the upper cover plate is coaxially crimped to the separation cylinder, an exhaust pipe is provided at the axis of the upper cover plate, the exhaust pipe is communicated with the funnel-shaped cyclone chamber, the lower end face of the upper cover plate is provided with a bottom side special-shaped end face, a cyclone-type gas flow channel is provided between the bottom side special-shaped end face and the top side special-shaped end face, and the cyclone-type gas flow channel is communicated with the funnel-shaped cyclone chamber; one end of the sampling tube is plugged into the exhaust pipe, and the other end of the sampling tube is connected to the suction device.

[0006] Preferably, the bottom end of the outer cover is coaxially and detachably connected with a fixing plate, and the top end of the outer cover is coaxially and detachably connected with a rain cover.

[0007] Preferably, the top side special-shaped end surface includes a bottom plane portion 1, an outer inclined portion 1, a top plane portion 1 and an inner inclined portion 1, the outer inclined portion 1 is arranged on the inner side of the bottom plane portion 1, and the inner side of the outer inclined portion 1 is higher than the outer side; the top plane portion 1 is arranged on the inner side of the outer inclined portion 1; the inner inclined portion 1 is arranged on the inner side of the top plane portion 1, and the inner side of the inner inclined portion 1 is lower than the outer side.

[0008] Preferably, a plurality of decay structures are evenly arranged circumferentially on the outer inclined surface portion one, and the plurality of decay structures are inclinedly arranged along the radial direction of the outer inclined surface portion one.

[0009] Preferably, a plurality of swirl structures are evenly arranged circumferentially on the inner inclined surface portion one, and the plurality of swirl structures are arranged radially inclined along the inner inclined surface portion one, and the inclination direction of the swirl structure is consistent with the inclination direction of the decay structure.

[0010] Preferably, the bottom side special-shaped end surface includes a bottom plane portion 2, an outer inclined surface portion 2, a top plane portion 2 and an inner inclined surface portion 2, and the bottom plane portion 2 corresponds to the bottom plane portion 1; the outer inclined surface portion 2 is located on the inner side of the bottom plane portion 2, the inner side of the outer inclined surface portion 2 is higher than the outer side, and the outer inclined surface portion 2 corresponds to the outer inclined surface portion 1; the top plane portion 2 is located on the inner side of the outer inclined surface portion 2, and the top plane portion 2 corresponds to the top plane portion 1; the inner inclined surface portion 2 is located on the inner side of the top plane portion 2, the inner side of the inner inclined surface portion 2 is lower than the outer side, and the inner inclined surface portion 2 corresponds to the inner inclined surface portion 1.

[0011] Preferably, the upper and lower ends of the decay structure are respectively connected to the outer inclined surface portion 1 and the outer inclined surface portion 2, and the plurality of decay structures between the separation cylinder and the upper cover plate constitute a first spiral air passage.

[0012] Preferably, the upper and lower ends of the swirl structure are respectively connected to the inner inclined surface portion 1 and the inner inclined surface portion 2, and the plurality of swirl structures between the separation cylinder and the upper cover plate constitute a second spiral air passage.

[0013] Preferably, the swirl gas flow channel between the bottom-side special-shaped end surface and the top-side special-shaped end surface consists of a first spiral gas channel and a second spiral gas channel.

[0014] The sampling head of an online pollen bioaerosol detection device of the present application has the following beneficial effects: 1. The cyclonic gas flow channel can be used to collect pollen bioaerosols in the air from the circumference of the sampling head, ensuring the collection efficiency and preventing the sampling head from being affected by wind direction; 2. The cyclonic gas flow channel can form a uniform annular laminar airflow, improve the cyclone effect in the funnel-shaped cyclone chamber, and improve the separation effect of large and small particles in the airflow; 3. The use of a swirl gas flow channel can further ensure the balance of suction around the sampling head.

[0015] On the other hand, the present application further provides a sampling method for an online pollen bioaerosol detection device, comprising the following steps: S1: Pump suction, providing suction to the sampling tube through an external suction device, forcing the sampling tube to provide suction to the separation tube, and then making the flow channel between the separation tube and the upper cover plate uniformly absorb the air containing pollen bioaerosol from the outside in the circumferential direction; S2, initial swirl, the outside air is adsorbed on the surrounding sides of the separation cylinder and the upper cover plate and enters between the top side special-shaped end surface and the bottom side special-shaped end surface, and is affected by the swirl gas flow channel to form a swirl; S3, separated, the swirling airflow enters the funnel-shaped cyclone chamber. Affected by the gradual narrowing of the airflow channel, the gas forms a spiral descent in the funnel-shaped cyclone chamber. During this process, large particles of impurities in the airflow fall downward along the outer wall of the funnel-shaped cyclone chamber. Under the action of the bottom cyclone pressure, small particle aerosols in the airflow will rise along the central normal area of ​​the funnel-shaped cyclone chamber, and will eventually be sucked up by the sampling tube pump and sent to the detection equipment.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of a sampling head of an online pollen bioaerosol detection device according to an embodiment of the present application; Figure 2 It is a schematic cross-sectional structural diagram of a sampling head of an online pollen bioaerosol detection device according to an embodiment of the present application; Figure 3 This is a structural exploded diagram of a sampling head of an online pollen bioaerosol detection device according to an embodiment of the present application; Figure 4is an exploded view of the local structure between the separation cylinder and the upper cover plate according to an embodiment of the present application; Figure 5 is a schematic diagram of the structure between the separation cylinder and the upper cover plate according to an embodiment of the present application; Figure 6 is a cross-sectional view of a separation cylinder and an upper cover plate according to an embodiment of the present application; Figure 7 According to the embodiment of the present application Figure 6 A is an enlarged view of the middle image.

[0019] Icons: 1. Outer cover; 11. Fixed plate; 12. Rain cover; 2. Separation cylinder; 21. Special-shaped end face on top side; 211. Bottom flat part one; 212. Outer inclined part one; 213. Top flat part one; 214. Inner inclined part one; 22. Funnel-shaped cyclone chamber; 23. Decorative structure; 24. Swirl structure; 3. Upper cover plate; 31. Exhaust pipe; 32. Special-shaped end face on bottom side; 321. Bottom flat part two; 322. Outer inclined part two; 323. Top flat part two; 324. Inner inclined part two; 33. Telescopic part; 331. Telescopic tube; 332. Spring; 34. Adjusting part; 341. End plate; 342. Guide rod; 343. Screw; 4. Sampling tube; 5. Ash hopper; 6. Dust screen. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] Embodiment 1, as Figure 1-Figure 5 As shown, a sampling head of an online pollen bioaerosol detection device according to an embodiment of the present application comprises an outer cover 1, a separation cylinder 2, an upper cover plate 3 and a sampling tube 4. The separation cylinder 2 is sealed and embedded in the outer cover 1. Specifically, a detachable method such as a threaded connection can be adopted, which will not be elaborated here.

[0022] like Figure 1 As shown, the bottom end of the outer cover 1 is coaxially and detachably connected with a fixing plate 11, the top end of the outer cover 1 is coaxially and detachably connected with a rain cover 12, and the fixing plate 11 is sealed and fixed to the pollen bioaerosol detection device through a sealing ring and bolts.

[0023] like Figure 2-Figure 5 As shown, the upper end surface of the separation cylinder 2 is provided with a top side special-shaped end surface 21, and the cylinder body of the separation cylinder 2 is provided with a funnel-shaped cyclone chamber 22.

[0024] It should be noted that if Figure 4 As shown, the top side special-shaped end surface 21 includes a bottom plane portion 211, an outer inclined portion 212, a top plane portion 213 and an inner inclined portion 214, the outer inclined portion 212 is arranged on the inner side of the bottom plane portion 211, and the inner side of the outer inclined portion 212 is higher than the outer side; the top plane portion 213 is arranged on the inner side of the outer inclined portion 212; the inner inclined portion 214 is arranged on the inner side of the top plane portion 213, and the inner side of the inner inclined portion 214 is lower than the outer side.

[0025] Furthermore, the upper cover plate 3 is coaxially crimped to the separation barrel 2, and an exhaust pipe 31 is arranged at the axis center of the upper cover plate 3, the exhaust pipe 31 is communicated with the funnel-shaped cyclone chamber 22, and a bottom side special-shaped end face 32 is arranged on the lower end face of the upper cover plate 3, and a cyclone-type gas flow channel is arranged between the bottom side special-shaped end face 32 and the top side special-shaped end face 21, and the cyclone-type gas flow channel is communicated with the funnel-shaped cyclone chamber 22.

[0026] It should be noted that the bottom side special-shaped end face 32 includes a bottom plane portion 321, an outer inclined portion 322, a top plane portion 323 and an inner inclined portion 324, and the bottom plane portion 321 corresponds to the bottom plane portion 211; the outer inclined portion 322 is located on the inner side of the bottom plane portion 321, the inner side of the outer inclined portion 322 is higher than the outer side, and the outer inclined portion 322 corresponds to the outer inclined portion 212; the top plane portion 323 is located on the inner side of the outer inclined portion 322, and the top plane portion 323 corresponds to the top plane portion 213; the inner inclined portion 324 is located on the inner side of the top plane portion 323, the inner side of the inner inclined portion 324 is lower than the outer side, and the inner inclined portion 324 corresponds to the inner inclined portion 214.

[0027] Further, such as Figure 3-Figure 5 As shown, a plurality of decay structures 23 are evenly arranged circumferentially on the outer inclined portion 212, and the plurality of decay structures 23 are inclinedly arranged along the radial direction of the outer inclined portion 212. A plurality of swirl structures 24 are evenly arranged circumferentially on the inner inclined portion 214, and the plurality of swirl structures 24 are inclinedly arranged along the radial direction of the inner inclined portion 214, and the inclination direction of the swirl structures 24 is consistent with the inclination direction of the decay structures 23.

[0028] Among them, the upper and lower ends of the decay structure 23 are respectively connected to the outer inclined surface portion 1 212 and the outer inclined surface portion 2 322, and the multiple decay structures 23 between the separation cylinder 2 and the upper cover plate 3 constitute a first spiral airway. The upper and lower ends of the swirl structure 24 are respectively connected to the inner inclined surface portion 1 214 and the inner inclined surface portion 2 324, and the multiple swirl structures 24 between the separation cylinder 2 and the upper cover plate 3 constitute a second spiral airway.

[0029] It can be understood that the swirl gas flow channel between the bottom profiled end surface 32 and the top profiled end surface 21 is composed of a first spiral gas channel and a second spiral gas channel.

[0030] One end of the sampling tube 4 is plugged into the exhaust pipe 31, and the other end of the sampling tube 4 passes through the upper cover plate 3, the separation cylinder 2 and the fixed plate 11 in sequence and is connected to the suction device. It can be understood that the suction device can be a vacuum pump or a motor, etc., as long as a certain degree of negative pressure can be formed in the sampling tube 4.

[0031] like Figure 1 and Figure 2 As shown, in a specific embodiment of the present application, an ash hopper 5 can be threadedly connected to the bottom of the funnel-shaped cyclone chamber 22 to collect large particles of dirt, and a dustproof net 6 is arranged between the bottom plane portion 1 211 and the bottom plane portion 2 321, which can prevent debris from being sucked into the cyclonic gas flow channel along with the airflow to a certain extent and causing blockage of the airway.

[0032] The following describes the use process of the sampling head of an online pollen bioaerosol detection device according to an embodiment of the present application with reference to the accompanying drawings: When in use, suction is formed in the sampling tube 4 by starting the external suction device, which then forces the swirl gas flow channel between the separation tube 2 and the upper cover plate 3 to generate suction to the outside. Because multiple swirl structures 24 and multiple ridge structures 23 cooperate with the top side special-shaped end surface 21 and the bottom side special-shaped end surface 32 to respectively form a second spiral air channel located on the inside and a first spiral air channel located on the outside, and the swirl structure 24 and the ridge structure 23 are both inclined in the same direction, after the outside air is sucked into the first spiral air channel on the outside, a certain degree of rotation will be formed. After the rotating airflow enters the second spiral airway on the inside, it converges and further rotates into the funnel-shaped cyclone chamber 22. As the diameter of the funnel-shaped cyclone chamber 22 gradually decreases, the rotating airflow speeds up due to the reduction in the radius of the annular surface, and the pressure of the airflow increases, squeezing The fluid moves upward along the center normal of the funnel-shaped cyclone chamber 22. Due to the action of centrifugal force, large particles of impurities in the airflow will run along the wall of the funnel-shaped cyclone chamber 22 and fall downward into the ash hopper 5. Small particles of aerosol in the airflow will be sampled by the sampling tube 4 along with the rising airflow. In this process, it should be noted that the cyclonic gas flow channel composed of the first spiral airway and the second spiral airway is arranged in a high-to-low state, so that water droplets or large particles of debris can be prevented from entering the sampling head to a certain extent. At the same time, the spiral shape and the high-to-low state of the first spiral airway and the second spiral airway can also avoid the influence of atmospheric wind direction and turbulence formed during the adsorption process on the sampling to a certain extent. The design of the equipment can directly sample pollen bioaerosols in the air without filtering the sample after mixing the solution.

[0033] In the second embodiment, since the power source of the entire sampling head is the suction provided by the sampling tube 4 at the exhaust pipe 31 of the upper cover plate 3, when the suction remains unchanged, the depth of the exhaust pipe 31 in the funnel-shaped cyclone chamber 22 will cause certain interference to the effective formation of the cyclone or the separation effect of the cyclone.

[0034] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, a telescopic member 33 is elastically inserted into the exhaust pipe 31, and the telescopic member 33 includes a telescopic tube 331 that slides at the bottom of the exhaust pipe 31, and a spring 332 is arranged between the telescopic tube 331 and the exhaust pipe 31. Specifically, one end of the spring 332 abuts against the top of the telescopic tube 331, and the other end of the spring 332 abuts against the exhaust pipe 31, so that the telescopic tube 331 has an elastic telescopic function in the exhaust pipe 31.

[0035] Furthermore, an adjusting member 34 is connected to the upper end of the telescopic tube 331, and the adjusting member 34 includes an end plate 341 which is sleeved on the sampling tube 4, and a plurality of guide rods 342 are circumferentially fixedly connected to the end plate 341, and a screw 343 is inserted in the upper limit position of the end plate 341 (axial limit, that is, the two cannot undergo relative axial displacement), wherein the plurality of guide rods 342 are slidably inserted in the exhaust pipe 31 and fixed to the telescopic tube 331, the screw 343 is threadedly connected to the exhaust pipe 31, and the end of the screw 343 away from the end plate 341 abuts against the telescopic tube 331.

[0036] Therefore, after the sampling tube 4 is inserted into the exhaust pipe 31, the screw 343 can be rotated to drive the end plate 341 to move axially along the exhaust pipe 31. The present application takes the downward axial displacement as an example. Figure 7 As shown, when the screw 343 drives the end plate 341 to move downward, the screw 343 itself and the multiple guide rods 342 will synchronously push the telescopic tube 331 to move downward. At this time, the telescopic tube 331 gradually extends out of the bottom end of the exhaust pipe 31 and compresses the spring 332. Conversely, the screw 343 rotates in the opposite direction, which will drive the end plate 341 and the multiple guide rods 342 to move upward. At this time, the spring 332 will force the telescopic tube 331 to gradually retract to the bottom end of the exhaust pipe 31 under the action of elastic force. In this way, the actual depth of the exhaust pipe 31 in the funnel-shaped cyclone chamber 22 can be controlled by fine-tuning, so that the suction force at the bottom end of the exhaust pipe 31 will not interfere with the state of the cyclone in the funnel-shaped cyclone chamber 22 as much as possible.

[0037] On the other hand, the present application embodiment further provides a sampling method for an online pollen bioaerosol detection device, comprising the following steps: S1: Pumping, providing suction to the sampling tube 4 through an external suction device, forcing the sampling tube 4 to provide suction to the separation tube 2, and then making the flow channel between the separation tube 2 and the upper cover plate 3 uniformly absorb the external air containing pollen bioaerosol in the circumferential direction; S2, initial swirl, the outside air is adsorbed around the separation cylinder 2 and the upper cover plate 3 and enters between the top side profiled end surface 21 and the bottom side profiled end surface 32, and is influenced by the swirl gas flow channel to form a swirl; S3, the separated, swirling airflow enters the funnel-shaped cyclone chamber 22. Affected by the gradual narrowing of the airflow channel, the gas forms a spiral descent in the funnel-shaped cyclone chamber 22. During this process, large particle impurities in the airflow fall downward along the outer wall of the funnel-shaped cyclone chamber 22. Under the action of the bottom cyclone pressure, the small particle aerosol in the airflow will rise along the central normal area of ​​the funnel-shaped cyclone chamber 22, and will eventually be pumped by the sampling tube 4 and sent to the detection equipment.

[0038] It should be noted that the specific models and specifications of the rain cover 12, spring 332, screw 343, sampling tube 4, ash hopper 5 and dust screen 6 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail.

[0039] The above are only preferred implementations of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sampling head for an online pollen bioaerosol detection device, characterized in that: include: Outer cover (1); A separation cylinder (2), the separation cylinder (2) being sealed and embedded in the outer cover (1), the upper end surface of the separation cylinder (2) being provided with a top side special-shaped end surface (21), and the body of the separation cylinder (2) being provided with a funnel-shaped cyclone chamber (22); an upper cover plate (3), the upper cover plate (3) being coaxially pressed onto the separation cylinder (2), an exhaust pipe (31) being arranged at the axis of the upper cover plate (3), the exhaust pipe (31) being in communication with the funnel-shaped cyclone chamber (22), a bottom side irregular end surface (32) being arranged at the lower end surface of the upper cover plate (3), a cyclone-type gas flow channel being arranged between the bottom side irregular end surface (32) and the top side irregular end surface (21), the cyclone-type gas flow channel being in communication with the funnel-shaped cyclone chamber (22); A sampling tube (4), one end of the sampling tube (4) being plugged into the exhaust pipe (31), and the other end of the sampling tube (4) being connected to a suction device.

2. The sampling head of the online pollen bioaerosol detection device according to claim 1, characterized in that: The bottom end of the outer cover (1) is coaxially and detachably connected to a fixing plate (11), and the top end of the outer cover (1) is coaxially and detachably connected to a rain cover (12).

3. The sampling head of the online pollen bioaerosol detection device according to claim 1, characterized in that: The top side special-shaped end surface (21) comprises: Bottom flat surface portion 1 (211); An outer inclined surface portion 1 (212), wherein the outer inclined surface portion 1 (212) is arranged on the inner side of the bottom plane portion 1 (211), and the inner side of the outer inclined surface portion 1 (212) is higher than the outer side; A top plane portion 1 (213), wherein the top plane portion 1 (213) is arranged on the inner side of the outer inclined portion 1 (212); An inner inclined surface portion 1 (214), wherein the inner inclined surface portion 1 (214) is arranged on the inner side of the top plane portion 1 (213), and the inner side of the inner inclined surface portion 1 (214) is lower than the outer side.

4. The sampling head of the online pollen bioaerosol detection device according to claim 3, characterized in that: A plurality of decay structures (23) are evenly arranged circumferentially on the outer inclined surface portion one (212), and the plurality of decay structures (23) are arranged obliquely along the radial direction of the outer inclined surface portion one (212).

5. The sampling head of the online pollen bioaerosol detection device according to claim 4, characterized in that: A plurality of swirl structures (24) are evenly arranged circumferentially on the inner inclined surface portion one (214); the plurality of swirl structures (24) are arranged obliquely along the radial direction of the inner inclined surface portion one (214); and the inclination direction of the swirl structures (24) is consistent with the inclination direction of the decay structure (23).

6. The sampling head of the online pollen bioaerosol detection device according to claim 5, characterized in that: The bottom shaped end surface (32) comprises: A second bottom plane portion (321), wherein the second bottom plane portion (321) corresponds to the first bottom plane portion (211); The second outer inclined surface portion (322), the second outer inclined surface portion (322) is located on the inner side of the second bottom plane portion (321), the inner side of the second outer inclined surface portion (322) is higher than the outer side, and the second outer inclined surface portion (322) corresponds to the first outer inclined surface portion (212); A second top plane portion (323), the second top plane portion (323) being located on the inner side of the second outer inclined surface portion (322), the second top plane portion (323) corresponding to the first top plane portion (213); The second inner inclined surface portion (324) is located inside the second top plane portion (323), the inner side of the second inner inclined surface portion (324) is lower than the outer side, and the second inner inclined surface portion (324) corresponds to the first inner inclined surface portion (214).

7. The sampling head of the online pollen bioaerosol detection device according to claim 6, characterized in that: The upper and lower ends of the decay structure (23) are respectively connected to the outer inclined surface portion 1 (212) and the outer inclined surface portion 2 (322), and the plurality of decay structures (23) between the separation cylinder (2) and the upper cover plate (3) form a first spiral airway.

8. The sampling head of the online pollen bioaerosol detection device according to claim 7, characterized in that: The upper and lower ends of the swirl structure (24) are respectively connected to the inner inclined surface portion 1 (214) and the inner inclined surface portion 2 (324), and the plurality of swirl structures (24) between the separation cylinder (2) and the upper cover plate (3) form a second spiral airway.

9. The sampling head of the online pollen bioaerosol detection device according to claim 8, characterized in that: The swirl-type gas flow channel between the bottom-side special-shaped end surface (32) and the top-side special-shaped end surface (21) consists of a first spiral gas channel and a second spiral gas channel.

10. A sampling method for an online pollen bioaerosol detection device, characterized in that: Using the sampling head of an online pollen bioaerosol detection device according to any one of claims 1 to 9, the method comprises the following steps: S1, pump suction, providing suction to the sampling tube (4) through an external suction device, forcing the sampling tube (4) to provide suction to the separation tube (2), thereby causing the flow channel between the separation tube (2) and the upper cover plate (3) to uniformly absorb external air containing pollen bioaerosol in a circumferential direction; S2, initial swirl, the outside air is adsorbed on the peripheral sides of the separation cylinder (2) and the upper cover plate (3) and enters between the top side profiled end surface (21) and the bottom side profiled end surface (32), and is influenced by the swirl-type gas flow channel to form a swirl; S3, the airflow that separates and forms a vortex enters the funnel-shaped cyclone chamber (22). Affected by the gradual narrowing of the airflow channel, the gas forms a spiral descent in the funnel-shaped cyclone chamber (22). During this process, large impurities in the airflow fall tangentially downward along the outer wall of the funnel-shaped cyclone chamber (22). Under the action of the bottom cyclone pressure, small aerosol particles in the airflow will rise along the central normal area of ​​the funnel-shaped cyclone chamber (22) and will eventually be pumped by the sampling tube (4) and sent to the detection equipment.

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