Rainproof impact type air particulate matter sampler

Abstract

The invention relates to the field of air sampling, in particular to a rainproof impact type air particulate matter sampler. Comprising a multi-stage impact type sampling head and a sampler main machine, a sampling opening is formed in the top end of the multi-stage impact type sampling head, a rainproof suite is further arranged above the sampling opening in a sleeving mode, and the multi-stage impact type sampling head is composed of a plurality of single-stage impact type sampling heads; the multi-stage impact type sampling head is communicated with the sampler main machine through exhaust pipes, the exhaust pipes comprise a first exhaust pipe and a second exhaust pipe, and a flow controller is further arranged between the first exhaust pipe and the second exhaust pipe; the sampler provided by the invention is provided with the rain-proof and bird-proof suite, can be effectively applied to the condition that the environment is relatively severe, and is also provided with the regulator capable of regulating the flow, so that the collected air sample can accurately reflect the real conditions of pollutants and particulate matters in the environment through accurate flow control.

Description

Technical Field

[0001] The present invention relates to the field of air sampling, and particularly to an impact air particulate sampler that can prevent rain. Background Art

[0002] Particulates and microorganisms widely exist in nature, especially in the air, and there are various types. They play an important role in the material cycle and the maintenance of ecological balance. However, a small part of the particulates and microorganisms existing in the air may be pathogenic. When the concentration of these pathogenic substances reaches a certain level, it will pose a great threat to human health and cause serious harm to human health and social economy. At the same time, their content is also one of the important indicators for air quality assessment. Their types, quantities, and distribution can reflect the air quality status, which is of great significance for evaluating and improving air quality.

[0003] Air particulate samplers are mainly applied in the fields of medical and health, food safety, biotechnology, environmental protection, etc. However, the existing air samplers usually adopt two connection methods: directly connecting a single cutting head to the sampling main body and connecting a multi-stage impact sampler to the main body. The method of directly connecting a single cutting head to the sampling main body makes the sampler only able to collect single or very few particulates, with low practicability. Moreover, the direct connection between the cutting head and the main body makes the sampler unable to work under bad weather conditions, with great limitations. Although connecting a multi-stage impact sampler to the main body can collect various different particle sizes and various different particulates at the same time, its flow rate is small, the collection efficiency is low, and the air inlet above the impact sampler is not protected by a shield, so air sampling cannot be carried out under weather conditions such as rain. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the background art and provide an impact air particulate sampler that can prevent rain. The sampler provided by the present invention is provided with a rain and bird prevention kit, which can effectively be applied in relatively harsh environments. And it is also equipped with a flow regulator that can adjust the flow rate. Through precise flow control, it can ensure that the collected air samples can accurately reflect the real situation of pollutants and particulates in the environment.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: An impact air particulate sampler that can prevent rain, including a multi-stage impact sampling head and a sampler main body. A sampling port is arranged at the top of the multi-stage impact sampling head, and a rain prevention kit is also sleeved above the sampling port. The multi-stage impact sampling head is composed of several single-stage impact sampling heads. The multi-stage impact sampling head and the sampler main body are communicated through an air extraction pipe. The air extraction pipe includes a first air extraction pipe and a second air extraction pipe, and a flow controller is also arranged between the first air extraction pipe and the second air extraction pipe.

[0006] Preferably, the air inlet of the sampling port is beveled. The air passage inside the sampling port includes a swirling side wall and a straight-flow side wall. An arc-shaped groove recessed inward is also provided at the top of the swirling side wall. Compared with the traditional circular sampling port, the beveled sampling port has a larger cross-sectional area, and the air flow rate that can pass through per unit time is greater. The swirling side wall and the straight-flow side wall are also provided on both sides of the air passage of the sampling port. An arc-shaped groove recessed inward is provided at the top of the swirling side wall. Such a design can make the air flow entering the sampling port have different flow rates and flow directions at different positions. When the air flow enters from the swirling side wall on one side of the arc-shaped groove, it will generate a certain rotation and acceleration due to the guidance of the arc, making it easier for some particulate matter particles that might otherwise bypass the sampling port to be involved in the sampling air flow. The air flow entering from the straight-flow side wall is relatively stable and can capture particulate matter particles moving in a straight line. The structural design of the sampling port can capture particulate matter particles with different particle sizes and movement trajectories more effectively, resulting in better air particulate sampling effect.

[0007] Preferably, the rain-proof kit includes a rain-proof base. A stepped base mounting portion is provided at the bottom of the rain-proof base. Several support columns for support are also installed at the top of the rain-proof base. A rain-proof cover is further provided at the top of the support columns. When the sampler is working in an outdoor environment, especially in the case of rain, if rainwater enters the sampler through the sampling port, it may damage the instrument or contaminate the sampling medium inside the sampler, affecting the normal collection and the accuracy of the detection results of particulate matter. Installing a rain-proof kit at the sampling port can effectively block rainwater from directly falling into the sampler, playing a role of a physical barrier.

[0008] Preferably, a stepped rain-proof kit mounting portion is provided on the outer side wall of the sampling port. The base mounting portion of the rain-proof kit is fitted and installed with the rain-proof kit mounting portion. The area of the rain-proof cover of the rain-proof kit is larger than the area of the sampling port. The rain-proof kit can not only block rainwater or other foreign objects from entering, but also allow air to enter the sampler normally. Without the rain-proof kit, rainwater will accumulate at the sampling port, hindering the normal entry of air into the sampling port, resulting in unstable sampling flow rate. Moreover, rainwater contains various impurities and dissolved substances. If mixed into the sampling gas, it will change the composition of the sampling gas and interfere with the detection of air particulate matter. The rain-proof kit can ensure that the collected air sample is not diluted and contaminated by rainwater, enabling the air particulate sampler to sample not only in normal weather but also in rainy weather, making the detection results more truly reflect the actual situation of the atmospheric environment.

[0009] Preferably, the sampling port is installed at the top position of the multi-stage impact sampling head. A sampling port pressing plate is provided at the bottom of the sampling port. A number of spring hooks are provided on the outer side wall of the multi-stage impact sampling head. The spring hooks are hung on the sampling port pressing plate by the action of spring elasticity to tightly press and install it on the multi-stage impact sampling head. The inside of the sampling port is communicated with the inside of the multi-stage impact sampling head. The air sample collected through the sampling port will pass through the single-stage impact sampling heads at all levels on the multi-stage impact sampling head and be adsorbed and collected by the culture medium on the single-stage impact sampling head, so as to realize the sampling and collection of air particles.

[0010] Preferably, the multi-stage impact sampling head is composed of a number of the single-stage impact sampling heads spliced together. The single-stage impact sampling head includes an impact plate. A sunken single-stage sampling head installation part is provided at the outer top end of the impact plate. A sampling head sealing ring is provided on the single-stage sampling head installation part. The multi-stage impact sampling head of the air sampler is assembled by multiple single-stage impact sampling heads. A sampling head sealing ring is provided on the single-stage sampling head installation part of each single-stage impact sampling head, which can ensure the sealing performance between the single-stage impact sampling heads. Finally, the single-stage impact sampling heads are tightly pressed and sealed by the pressure applied by the external spring hooks.

[0011] Preferably, an impact plate with air holes is provided in the impact plate. The impact plate is an upward convex arc structure with a certain inclination angle on both sides. A culture dish for collecting microorganisms in the air is also provided below the impact plate. The impact plate in the impact plate is an upward convex arc structure. Compared with the traditional flat impact plate, the arc-shaped impact plate can better guide and disperse the air flow, reduce the resistance and energy loss of the air flow during the impact process. When the air flow hits the arc-shaped impact plate, it can flow smoothly along its curved arc surface and be more evenly distributed on the surface of the impact plate, which is more conducive to improving the efficiency of microorganism sampling, making the air flow more stable, reducing the occurrence of impact rebound of microorganisms, and improving the capture efficiency of microorganisms.

[0012] Preferably, a sampling head base is provided at the bottom of the multi-stage impact sampling head. An air extraction channel communicated with the inside of the multi-stage impact sampling head is opened in the sampling head base. A sampling head interface for installing the first air extraction pipe is also provided on the sampling head base. An air extraction channel is provided at the bottom of the multi-stage impact sampling head. The air extraction channel is communicated with the air extraction pipe and finally with the main body of the sampler. After the main body of the sampler is started, it will extract the air in the external environment. The air will enter the multi-stage impact sampling head through the sampling port. Finally, the culture dish in the sampling head will effectively collect the microorganisms in the air for subsequent culture and analysis.

[0013] Preferably, the flow controller includes a valve body. Fixed sealing rings are fixedly arranged at both ends inside the valve body. A movable sealing piston is also arranged inside the valve body. The sealing piston divides the interior of the valve body into a large flow chamber and a small flow chamber. Changes in external conditions such as temperature, humidity, and pressure will affect the actual flow rate of the gas. The flow controller can ensure the consistency and comparability of sampling results under different environmental conditions by adjusting the magnitude of the incoming air flow rate, reducing the experimental result errors caused by environmental factors. By controlling the incoming air flow rate, it can be ensured that the collected air samples can accurately reflect the true situation of pollutants and particulate matters in the environment. By adjusting the position of the sealing piston, the volume of the flow chamber can be controlled, thereby changing the amount of air passing through per unit time to achieve flow control.

[0014] Preferably, on the outer side wall of one end of the valve body, a large flow air extraction port is opened at one end close to the large flow chamber, and a small flow air extraction port is opened at one end close to the small flow chamber. On the other end face close to the small flow chamber, a number of first air extraction pipe interfaces are hierarchically opened. The large flow air extraction port and the small flow air extraction port are both in communication with the outside air. A plug is provided at each of the number of first air extraction pipe interfaces and they are not in communication with the outside air. The second air extraction pipe of the air sampler is in communication with only one air extraction port at a time. When a larger flow rate is required, it is in communication with the large flow air extraction port. When a smaller flow rate is required, it is in communication with the small flow air extraction port. By changing the position of the sealing piston inside the valve body, the indoor volume of the large flow chamber or the small flow chamber can be adjusted, thereby achieving control of the air flow rate passing through. A number of first air extraction pipe interfaces are opened on the other side of the valve body. All the first air extraction pipe interfaces are not in communication with the outside air. The first air extraction pipe is in communication with only one first air extraction pipe interface at a time. Through the hierarchical design of the number of first air extraction pipe interfaces on the side wall, more accurate control of the air flow rate can be achieved. The flow controller can flexibly adjust the flow rate of the sampler, improving the versatility and utilization rate of the equipment, enabling the air samples collected by the air sampler to accurately reflect the true situation of pollutants and particulate matters in the environment, and providing a more reliable data basis for subsequent air index analysis and research.

[0015] In summary, the beneficial effects of the present invention are: 1. An impact air particulate sampler with rain protection according to the present invention. The provided air particulate sampler is provided with a rain protection kit, enabling the sampler to normally sample even in harsh environments, collecting air conditions in different environments, and making the sampling and detection results of the sampler more truly reflect the actual situation of the atmospheric environment. The sampling port of the present invention is in an oblique cut shape and is provided with a swirling side wall and a direct current side wall, allowing a larger air inflow, making it easier for some particulate particles that might otherwise bypass the sampling port to be involved in the sampling air flow, and more effectively capturing particulate particles with different particle sizes and movement trajectories, resulting in better air particulate sampling effects. 2. An impact air particulate sampler with rain protection according to the present invention. The impact plate is an upwardly convex arc structure with a certain inclination angle on both sides, which can better guide and disperse the air flow, reducing the resistance and energy loss during the impact of the air flow. When the air flow impacts the arc-shaped impact plate, it can flow smoothly along its curved arc surface and be more evenly distributed on the surface of the impact plate, which is more conducive to improving the efficiency of particulate sampling, making the air flow more stable, reducing the occurrence of particulate impact and rebound, and improving the capture efficiency of particulate matter. 3. An impact air particulate sampler with rain protection according to the present invention. The air particulate sampler provided by the present invention is also provided with a flow controller. Changes in conditions such as temperature, humidity, and pressure in the environment will affect the actual air flow. The flow controller can adjust the size of the incoming air flow to ensure the consistency and comparability of sampling results under different environmental conditions, reducing experimental result errors caused by environmental factors. By controlling the incoming air flow, it can ensure that the collected air samples can accurately reflect the true situation of pollutants and particulate matter in the environment. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the sampling port of the present invention; Figure 3 is the structural schematic diagram of the rain protection kit of the present invention; Figure 4 is the structural schematic diagram of the sampling head of the present invention; Figure 5 is the structural schematic diagram of the single-stage sampling head of the present invention; Figure 6 is the overall structural schematic diagram of the present invention with a flow controller; Figure 7 is the structural schematic diagram of the flow controller of the present invention.

[0017] Markings in the figure: 1 - multi - stage impact sampling head, 101 - single - stage impact sampling head, 102 - impact disc, 103 - single - stage sampling head mounting part, 104 - sampling head sealing ring, 105 - impact plate, 106 - petri dish, 107 - sampling head base, 108 - air extraction duct, 109 - sampling head interface, 2 - sampler main body, 3 - sampling port, 31 - swirling side wall, 32 - straight - flow side wall, 33 - arc - shaped groove, 34 - rain - proof kit mounting part, 35 - sampling port pressure plate, 4 - rain - proof kit, 41 - rain - proof base, 42 - base mounting part, 43 - support column, 44 - rain - proof cover, 5 - flow controller, 51 - valve body, 52 - fixed sealing ring, 53 - sealing piston, 54 - large - flow chamber, 55 - small - flow chamber, 56 - large - flow air extraction port, 57 - small - flow air extraction port, 58 - first air extraction port interface, 6 - air extraction pipe, 61 - first air extraction pipe, 62 - second air extraction pipe, 7 - spring hook. Detailed implementation manners

[0018] The following specific embodiments are only interpretations of the present invention and do not limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without creative contributions as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] Embodiment 1

[0021] According to Figures 1 to 5 As shown, a rain - proof impact air particulate matter sampler includes a multi - stage impact sampling head 1 and a sampler main body 2. A sampling port 3 is provided at the top of the multi - stage impact sampling head 1, and a rain - proof kit 4 is also sleeved above the sampling port 3. The multi - stage impact sampling head 1 is composed of several single - stage impact sampling heads 101, and the multi - stage impact sampling head 1 and the sampler main body 2 are connected through an air extraction pipe 6; A rain - proof kit 4 is installed on the sampling port 3 at the top of the multi - stage impact sampling head 1. The rain - proof kit 4 can not only prevent rain but also prevent other special situations such as birds. The design of the rain - proof kit 4 enables the air particulate matter sampler to still perform air sampling in relatively harsh weather conditions, and can make the detection results of the air particulate matter sampler more truly reflect the actual situation of the atmospheric environment.

[0022] According to Figure 2As shown, the air inlet of the sampling port 3 is in an inclined cut shape. The air passage inside the sampling port 3 includes a swirling side wall 31 and a straight-through side wall 32. An arc-shaped groove 33 that is recessed inward is also provided at the top position of the swirling side wall 31. Compared with the traditional circular sampling port, the inclined cut-shaped sampling port 3 has a larger cross-sectional area, and the air flow rate that can pass through per unit time is greater. The swirling side wall 31 and the straight-through side wall 32 are also provided on both sides of the air passage of the sampling port 3. An arc-shaped groove 33 that is recessed inward is provided at the top position of the swirling side wall 31. Such a design can make the air flow entering the sampling port 3 have different flow velocities and flow directions at different positions. When the air flow enters from the swirling side wall 31 on one side of the arc-shaped groove 33, it will generate a certain rotation and acceleration due to the guidance of the arc, making it easier for some particulate matter particles that might otherwise bypass the sampling port 3 to be involved in the sampling air flow. The air flow entering from the straight-through side wall 32 is relatively stable and can capture particulate matter particles moving in a straight line. The structural design of the sampling port 3 can capture particulate matter particles with different particle sizes and movement trajectories more effectively, making the air particulate matter sampling effect better.

[0023] According to Figure 3 As shown, the rain-proof kit 4 includes a rain-proof base 41. A stepped base mounting portion 42 is provided at the bottom end of the rain-proof base 41. A number of support columns 43 for support are also installed at the top end of the rain-proof base 41. A rain-proof cover 44 is also provided at the top of the support columns 43. The rain-proof cover 44 is designed with a flat top that extends outward and then bends downward. The support columns 43 are provided at the lower part of the rain-proof cover 44 to support it on the rain-proof base 41. The support columns 43 separate the rain-proof cover 44 from the rain-proof base 41, leaving a gap between the rain-proof base 41 and the rain-proof cover 44 to allow external air to enter the sampler smoothly. When the sampler is working in an outdoor environment, especially in the case of rainfall, if rainwater enters the sampler through the sampling port 3, it may damage the instrument or contaminate the sampling medium inside the sampler, affecting the normal growth of particulate matter and the accuracy of the detection results. Installing the rain-proof kit 4 at the sampling port 3 can effectively block rainwater from directly falling into the sampler, playing a role of a physical barrier.

[0024] According to Figure 2 、 Figure 3As shown, a stepped rainproof kit installation portion 34 is provided on the outer side wall of the sampling port 3, and the base installation portion 42 of the rainproof kit 4 is installed in cooperation with the rainproof kit installation portion 34, and the area of ​​the rainproof cover 44 of the rainproof kit 4 is larger than the area of ​​the sampling port 3; the rainproof kit 4 is installed on the sampling port 3 of the sampler, and the area of ​​the rainproof cover 44 is larger than the area of ​​the sampling port 3, so that the rainproof cover 44 of the rainproof kit 4 can well protect the sampling port 3 of the sampler, so that external rainwater and other foreign matter will not easily enter the interior of the sampler, and the rainproof kit 4 can not only prevent rainwater or other foreign matter from entering, but also allow Allow air to enter the sampler normally. If there is no rainproof kit 4, rainwater will gather at the sampling port 3, preventing air from entering the sampling port 3 normally, resulting in unstable sampling flow. In addition, rainwater contains various impurities and dissolved substances. If they are mixed into the sampling gas, they will change the composition of the sampling gas and interfere with the detection of air particles. The rainproof kit 4 can ensure that the collected air samples are not diluted and contaminated by rainwater, so that the air particle sampler can not only sample in normal weather, but also sample in rainy days, so that the test results can more truly reflect the actual situation of the atmospheric environment.

[0025] according to Figure 4 As shown, the sampling port 3 is installed at the top position of the multi-stage impact sampling head 1, and a sampling port pressure plate 35 is arranged at the bottom of the sampling port 3. A plurality of spring hooks 7 are arranged on the outer wall of the multi-stage impact sampling head 1. The spring hooks 7 are hung on the sampling port pressure plate 35 by the spring elastic force to press it tightly on the multi-stage impact sampling head 1; the interior of the sampling port 3 is connected with the interior of the multi-stage impact sampling head 1, and the air sample collected through the sampling port 3 will pass through the single-stage impact sampling heads 101 of each stage on the multi-stage impact sampling head 1, and will be adsorbed and collected by the culture medium on the single-stage impact sampling head 101, thereby realizing the sampling and collection of air particulate matter.

[0026] according to Figure 4 , Figure 5 As shown, the multi-stage impact sampling head 1 is composed of a plurality of single-stage impact sampling heads 101, the single-stage impact sampling head 101 includes an impact disk 102, the outer top end of the impact disk 102 is provided with a recessed single-stage sampling head mounting portion 103, and the single-stage sampling head mounting portion 103 is provided with a sampling head sealing ring 104; the multi-stage impact sampling head 1 of the air sampler is assembled by a plurality of single-stage impact sampling heads 101, and a sampling head sealing ring 104 is provided on the single-stage sampling head mounting portion 103 of each single-stage impact sampling head 101, which can ensure the sealing between the single-stage impact sampling heads 101, and finally the single-stage impact sampling heads 101 are pressed and sealed by the pressure applied by the external spring hook 7.

[0027] according to Figure 5As shown in the figure, an impact plate 105 with air holes is provided in the impact disk 102. The impact plate 105 is an upwardly convex arc structure with a certain inclination angle on both sides. A culture dish 106 for collecting microorganisms in the air is also provided below the impact plate 105; the impact plate 105 in the impact disk 102 is an upwardly convex arc structure. Compared with the traditional flat impact plate 105, the arc-shaped impact plate 105 can better guide and disperse the air flow, reduce the resistance and energy loss of the air flow during the impact process. When the air flow impacts the arc-shaped impact plate 105, it can flow smoothly along its curved arc surface, and can be more evenly distributed on the surface of the impact plate 105, which is more conducive to improving the efficiency of microorganism sampling, making the air flow more stable, reducing the occurrence of microorganism impact rebound, and improving the capture efficiency of microorganisms.

[0028] According to Figure 4 As shown in the figure, a sampling head base 107 is provided at the bottom of the multi-stage impact sampling head 1. An air extraction channel 108 communicating with the inside of the multi-stage impact sampling head 1 is opened in the sampling head base 107. A sampling head interface 109 for installing the extraction tube 6 is also provided on the sampling head base 107; an air extraction channel 108 is provided at the bottom of the multi-stage impact sampling head 1. The air extraction channel 108 communicates with the extraction tube 6 and finally communicates with the sampler main unit 2. After the sampler main unit 2 is started, it will extract the air in the external environment. The air will enter the multi-stage impact sampling head 1 through the sampling port 3. Finally, the culture dish 106 in the sampling head will effectively collect the microorganisms in the air for subsequent cultivation and analysis.

[0029] Embodiment 2

[0030] According to Figure 6 、 Figure 7 As shown in the figure, the difference from the above Embodiment 1 is that the extraction tube 6 of an impact air particulate sampler that can prevent rain includes a first extraction tube 61 and a second extraction tube 62, and a flow controller 5 is also provided between the first extraction tube 61 and the second extraction tube 62; the flow controller 5 includes a valve body 51. Fixed sealing rings 52 are fixedly provided at both ends inside the valve body 51. A movable sealing piston 53 is also provided inside the valve body 51. The sealing piston 53 divides the inside of the valve body into a large flow chamber 54 and a small flow chamber 55; changes in external temperature, humidity, pressure and other conditions will affect the actual flow rate of the gas, and the flow controller 5 can adjust the size of the incoming air flow to ensure the consistency and comparability of the sampling results under different environmental conditions, reducing the experimental result errors caused by environmental factors. By controlling the incoming air flow, it can ensure that the collected air sample can accurately reflect the true situation of pollutants and particulate matter in the environment. By adjusting the position of the sealing piston 53, the volume of the flow chamber can be controlled, so as to change the amount of air passing through per unit time to achieve flow control.

[0031] According to Figure 7 As shown, a large-flow air extraction port 56 is provided at one end of the outer side wall of the valve body 51 near the large-flow chamber 54, and a small-flow air extraction port 57 is provided at one end near the small-flow chamber 55. A number of first air extraction pipe interfaces 58 are hierarchically provided on the other end face near the small-flow chamber 55. Among them, both the large-flow air extraction port 56 and the small-flow air extraction port 57 are in communication with the outside air, and a plug is provided at each of the number of first air extraction pipe interfaces 58 and they are not in communication with the outside air; the second air extraction pipe 62 of the air particulate sampler is in communication with only one air extraction port at a time. When the required flow rate is large, it is in communication with the large-flow air extraction port 56. When the required flow rate is small, it is in communication with the small-flow air extraction port 57. By changing the position of the sealing piston 53 in the valve body 51, the indoor volume of the large-flow chamber 54 or the small-flow chamber 55 can be adjusted, so as to realize the control of the air flow rate passing through; a number of first air extraction pipe interfaces 58 are provided on the other side of the valve body 51, and all the first air extraction pipe interfaces 58 are not in communication with the outside air. The first air extraction pipe 61 is in communication with only one first air extraction pipe interface 58 at a time. Through the hierarchical design of the number of first air extraction pipe interfaces 58 on the side wall, more accurate control of the air flow rate can be realized; the flow controller 5 can flexibly adjust the flow rate of the sampler, improving the versatility and utilization rate of the equipment, enabling the air sample collected by the air sampler to accurately reflect the true situation of pollutants and particulate matters in the environment, and providing a more reliable data basis for subsequent air index analysis and research.

Claims

1. A rainproof impact air particle sampler, characterized in that: The invention comprises a multi-stage impact sampling head (1) and a sampler main unit (2); a sampling port (3) is arranged at the top of the multi-stage impact sampling head (1); a rainproof kit (4) is also provided above the sampling port (3); the multi-stage impact sampling head (1) is composed of a plurality of single-stage impact sampling heads (101); the multi-stage impact sampling head (1) and the sampler main unit (2) are connected via an air extraction pipe (6); the air extraction pipe (6) comprises a first air extraction pipe (61) and a second air extraction pipe (62); a flow controller (5) is also provided between the first air extraction pipe (61) and the second air extraction pipe (62).

2. A rainproof impact air particle sampler according to claim 1, characterized in that: The air inlet of the sampling port (3) is in an oblique shape, and the air passage inside the sampling port (3) comprises a swirl side wall (31) and a straight side wall (32), and an inwardly recessed arc groove (33) is also provided at the top of the swirl side wall (31).

3. The rainproof impact air particle sampler according to claim 1, characterized in that: The rainproof kit (4) comprises a rainproof base (41), the bottom end of the rainproof base (41) is provided with a stepped base mounting portion (42), the top end of the rainproof base (41) is also provided with a plurality of support columns (43) for support, and the top of the support column (43) is also provided with a rainproof cover (44).

4. The rainproof impact air particle sampler according to claim 3, characterized in that: A stepped rainproof kit mounting portion (34) is provided on the outer side wall of the sampling port (3); the base mounting portion (42) of the rainproof kit (4) is mounted in cooperation with the rainproof kit mounting portion (34); and the area of ​​the rainproof cover (44) of the rainproof kit (4) is larger than the area of ​​the sampling port (3).

5. The rainproof impact air particle sampler according to claim 1, characterized in that: The sampling port (3) is installed at the top of the multi-stage impact sampling head (1); a sampling port pressure plate (35) is provided at the bottom of the sampling port (3); a plurality of spring hooks (7) are provided on the outer wall of the multi-stage impact sampling head (1); the spring hooks (7) are hung on the sampling port pressure plate (35) by the elastic force of the springs to press the sampling port pressure plate (35) and install it on the multi-stage impact sampling head (1).

6. The rainproof impact air particle sampler according to claim 1, characterized in that: The multi-stage impact sampling head (1) is composed of a plurality of single-stage impact sampling heads (101) spliced ​​together, wherein the single-stage impact sampling head (101) comprises an impact disk (102), a recessed single-stage sampling head mounting portion (103) is provided at the outer top end of the impact disk (102), and a sampling head sealing ring (104) is provided on the single-stage sampling head mounting portion (103).

7. The rainproof impact air particle sampler according to claim 6, characterized in that: An impact plate (105) with air holes is arranged in the impact disk (102); the impact plate (105) is an upwardly protruding arc structure with a certain inclination angle on both sides; a culture dish (106) for collecting microorganisms in the air is also arranged below the impact plate (105).

8. The rainproof impact air particle sampler according to claim 7, characterized in that: A sampling head base (107) is provided at the bottom of the multi-stage impact sampling head (1), an air extraction passage (108) communicating with the interior of the multi-stage impact sampling head (1) is provided in the sampling head base (107), and a sampling head interface (109) for mounting with the first air extraction pipe (61) is also provided on the sampling head base (107).

9. The rainproof impact air particle sampler according to claim 1, characterized in that: The flow controller (5) comprises a valve body (51), fixed sealing rings (52) are fixedly arranged at both ends of the valve body (51), and a movable sealing piston (53) is also arranged inside the valve body (51), and the sealing piston (53) divides the inner part of the valve body into a large flow chamber (54) and a small flow chamber (55).

10. The rainproof impact air particle sampler according to claim 9, characterized in that: A large flow rate exhaust port (56) is provided on the outer wall of one end of the valve body (51) at the end close to the large flow rate chamber (54), and a small flow rate exhaust port (57) is provided at the end close to the small flow rate chamber (55). A plurality of first exhaust pipe interfaces (58) are also provided in stages on the other end surface close to the small flow rate chamber (55), wherein the large flow rate exhaust port (56) and the small flow rate exhaust port (57) are both connected to the outside air, and a plurality of the first exhaust pipe interfaces (58) are all provided with plugs and are not connected to the outside air.

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