Sampler and sampling method for passive flow regime regulation and anti-interface adsorption

Abstract

The present application relates to the technical field of liquid sampling, in particular to a passive flow state regulation and anti-interface adsorption sampler and method. The sampler comprises: a sampler body provided with a sample sampling container, a sampling inlet and an independent sample discharge path in communication with the sampling container; the sampling inlet is sequentially provided with a smooth flow state shaping area and an interface inhibition area with non-matted micro-scale protrusions; the sampling inlet is provided on the outside or front end with a non-cylindrical symmetric fluid buffer shaping structure, the axis of which is offset from the sampling inlet, for forming a velocity gradient attenuation path; the sampling container is provided with an inert multi-channel interface control structure for dispersing the sample into small volume channels; and a fixing support for connecting an external platform. The present application can realize stable sample introduction and interface adsorption inhibition without active control.

Description

Technical Field

[0001] This invention relates to the field of liquid sampling technology, specifically to a sampler and sampling method with passive flow regime control and resistance to interfacial adsorption. Background Technology

[0002] In applications such as water pollution monitoring, environmental sampling, and emergency detection, the stability of the sampling process and the authenticity of the samples face severe challenges when sampling oily or highly adsorbent liquids. Existing technologies mainly suffer from the following shortcomings: I. Unstable Flow Pattern During Sampling Injection: When the sampling inlet approaches or contacts the liquid surface, the liquid flow near the sampling inlet exhibits significant transient instability due to natural fluctuations in the liquid surface, external airflow disturbances, or changes in the attitude of the mounting platform (such as a drone or robotic arm). This can easily lead to instantaneous inrush, backflow, or flow interruption. This unstable flow pattern results in large fluctuations in the sample volume and a decrease in sample representativeness. Especially for oily liquids, the disturbances can exacerbate oil-water mixing, further affecting the accuracy of the test results.

[0003] II. Interfacial adsorption is prone to occur during sample storage and transportation: During storage and transportation after sampling, oily or adhesive components are frequently exposed to the container's inner wall due to overall liquid sloshing, easily forming an oil film that adheres to or remains on the container's inner wall. This interfacial adsorption phenomenon not only causes the loss of the target components in the sample but may also lead to cross-contamination or result deviations in subsequent detection. The impact of interfacial adsorption is particularly significant for the detection of low-concentration oil stains or trace amounts of adhesive substances.

[0004] Third, existing solutions mostly focus on preventing sloshing during transportation or rely on active control: To address liquid sloshing, existing technologies primarily employ passive structures such as baffles and partitions inside the container, or rely on active control actuators such as valves and pumps for regulation. However, these solutions mainly target the transportation phase after sampling, paying less attention to transient flow regulation during the sample introduction phase. Furthermore, active control solutions require external energy and sensors, increasing system complexity and cost, making them unsuitable for lightweight platforms such as drones.

[0005] IV. Lack of systematic structural design targeting interfacial adsorption mechanisms: For the interfacial adsorption problem on the inner wall of the sampling inlet and inside the sampling container, existing technologies mostly use hydrophobic and oleophobic coatings, but these coatings are prone to wear and failure during long-term use. Few solutions suppress adsorption from the interfacial contact state through micromorphological design (such as non-textured microstructures), and there is a lack of systematic solutions that synergistically design sample flow regime control and interfacial adsorption suppression. Summary of the Invention

[0006] The purpose of this invention is to provide a passive flow regime control and anti-interfacial adsorption sampler, which aims to solve the technical problems existing in the sampling process of oily or liquids with interfacial adsorption characteristics, such as unstable flow regime during the sample introduction stage, easy interfacial adsorption of samples on the inner wall of the container during transportation and storage, and existing solutions relying on active control or only focusing on anti-swaying during transportation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A passive flow regime control and anti-interfacial adsorption sampler, comprising: The sampler body is provided with a sample sampling container and a sampling inlet and a sample discharge path connected to the sample sampling container. The sample discharge path and the sampling inlet are set independently of each other. The interior of the sampling inlet is divided into a flow shaping zone and an interface inhibition zone along the liquid entry direction. The inner wall of the flow shaping zone is a smooth surface, and the inner wall of the interface inhibition zone is provided with non-textured microscale protrusion structures. A fluid buffer shaping structure is disposed outside the sampling inlet or at the front end of the sampling inlet channel. The fluid buffer shaping structure is a non-cylindrical symmetric structure. The geometric axis of the fluid buffer shaping structure is offset from the axis of the sampling inlet. It is used to make the external liquid form a non-periodic velocity gradient attenuation path along the surface of the fluid buffer shaping structure before entering the sampling inlet during the sampling process. A multi-channel interface control structure is disposed inside the sample sampling container. The multi-channel interface control structure is made of inert material and forms multiple parallel or interconnected fine-scale channels for dispersing the sample in the multiple fine-scale channels. A fixed bracket is installed on the sampler body for connecting to an external platform.

[0008] Furthermore, the geometric shape of the fluid buffer shaping structure is streamlined, teardrop-shaped, or has a non-axisymmetric gradient feature.

[0009] Furthermore, the characteristic length L of the fluid buffer shaping structure s The dominant characteristic wavelength λ of the external liquid surface disturbance at the sampling inlet satisfies the following relationship: 0.1λ≤L s ≤1.5λ.

[0010] Furthermore, the microscale protrusions on the inner wall of the interface suppression region are arranged in an array or aperiodic distribution, and the height and spacing of the microscale protrusions are smaller than the characteristic size of the sampling inlet, so that they do not form fluid blockage or filtering effects.

[0011] Furthermore, the multi-channel interface control structure can be honeycomb, grid, or porous channel structure.

[0012] Furthermore, the equivalent hydraulic diameter d of a single channel in the multi-channel interface control structure h Smaller than the characteristic length L of the sample during transport to form an overall inertial flow. i , satisfying: d h <0.5L i .

[0013] Furthermore, the sample sampling container is located in the lower region of the sampler body, and the sampling inlet and the fluid buffer shaping structure are located in the upper region of the sampler body, so that the change in the overall center of gravity of the sampler mainly occurs along the longitudinal axis direction during the increase of sample volume.

[0014] Furthermore, the fixed bracket is offset from the axis of the sampling inlet, and the fixed bracket has a degree of freedom of adjustment during the installation stage, and is in a rigid locking state after the installation is completed.

[0015] Furthermore, the sample discharge path is located in the upper region of the sample sampling container and is independent of the sampling inlet, which is used to discharge the sample from the sample sampling container after sampling is completed, so that the sampling inlet maintains a "no discharge" working state.

[0016] A sampling method for passive flow regime control and anti-interfacial adsorption using the above-mentioned sampler includes the following steps: The sampling inlet is brought into contact with the liquid to be sampled. The fluid buffer and shaping structure disperses and attenuates the liquid surface fluctuations and external disturbances, making the liquid flow state entering the sampling inlet tend to be stable. The liquid sequentially passes through the flow shaping zone and the interface inhibition zone within the sampling inlet. The flow shaping zone maintains the continuity of the liquid, while the interface inhibition zone reduces the wetting and retention of the liquid on the inner wall of the sampling inlet through non-textured microscale protrusion structures. After the liquid enters the sample sampling container, the sample is dispersed in multiple fine-scale channels through a multi-channel interface control structure, which weakens the overall inertial flow of the sample and reduces the probability of effective contact between the sample and the inner wall of the container. After sampling is completed, the sample is discharged through the sample discharge path, so that the sampling inlet remains in a "no-out" working state.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By using a non-cylindrical symmetric fluid buffer and shaping structure, liquid surface fluctuations and external disturbances are attenuated without active control, achieving continuous and stable liquid flow during the sample introduction stage, thereby improving the repeatability of sampling and the representativeness of the samples.

[0018] By combining the interface inhibition zone (non-hair-like microscale protrusion structure) on the inner wall of the sampling inlet with the multi-channel interface control structure inside the sampling container, the adhesion and retention of oily or adhesive components on the inner wall of the container are suppressed from both the interface contact state and the overall inertial flow of the liquid, thus maintaining the original composition of the sample.

[0019] During transportation, the liquid inside the sample sampling container may slosh due to changes in the sampler's posture or external vibrations. In this case, the multi-channel interface control structure located inside the sample sampling container disperses the sample into multiple fine-scale channels, thereby reducing the overall flow amplitude of the sample and decreasing the effective contact probability between the sample per unit volume and the inner wall of the sample sampling container.

[0020] By placing the sample sampling container at the bottom and the sampling inlet and fluid buffer shaping structure at the top in a center-of-gravity layout, the change in the center of gravity of the sampler mainly occurs along the longitudinal direction as the sample volume increases, thus improving the attitude stability of the sampler under complex working conditions.

[0021] The fixed bracket is offset from the sampling inlet axis and has the freedom of installation and adjustment. It can be adapted to various external platforms such as drones, robotic arms, and floating platforms, while avoiding interference with the flow field at the sampling inlet.

[0022] An independent sample discharge path keeps the sampling inlet in a "no-go" state, avoiding contamination and loss caused by reverse flow of samples after sampling, which is beneficial to the consistency and reliability of samples under multiple sampling conditions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the passive flow regime control and anti-interfacial adsorption sampler according to an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the sampler with passive flow regulation and anti-interfacial adsorption according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1. Sampler body; 11. Sample sampling container; 12. Sampling inlet; 121. Flow shaping zone; 122. Interface suppression zone; 13. Sample discharge path; 131. Discharge port; 132. Flow guide channel; 2. Fluid buffer shaping structure; 3. Multi-channel interface control structure; 4. Fixing bracket. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 and Figure 2As shown, an embodiment of the present invention discloses a sampler with passive flow regime control and resistance to interfacial adsorption, comprising: The sampler body 1 is provided with a sample sampling container 11 and a sampling inlet 12 and a sample discharge path 13 connected to the sample sampling container 11. The sample discharge path 13 and the sampling inlet 12 are set independently. The interior of the sampling inlet 12 is divided into a flow shaping zone 121 and an interface inhibition zone 122 along the liquid entry direction. The inner wall of the flow shaping zone 121 is a smooth surface, and the inner wall of the interface inhibition zone 122 is provided with non-textured microscale protrusion structures. The fluid buffer shaping structure 2 is located outside the sampling inlet 12 or at the front end of the sampling inlet 12 channel. The fluid buffer shaping structure 2 is a non-cylindrical symmetric structure. The geometric axis of the fluid buffer shaping structure 2 is offset from the axis of the sampling inlet 12. It is used to make the external liquid form a non-periodic velocity gradient decay path along the surface of the fluid buffer shaping structure 2 before entering the sampling inlet 12 during the sampling process. The multi-channel interface control structure 3 is set inside the sample sampling container 11. The multi-channel interface control structure 3 is made of inert material and forms multiple parallel or connected fine-scale channels for dispersing the sample in multiple fine-scale channels. The fixed bracket 4 is set on the sampler body 1 and is used to connect to the external platform.

[0027] By using a non-cylindrical symmetric fluid buffer shaping structure 2, liquid surface fluctuations and external disturbances are attenuated without active control, achieving continuous stability of the liquid flow state during the sample introduction stage, and improving the repeatability of sampling and the representativeness of the samples.

[0028] Through the synergistic effect of the interface inhibition zone 122 (non-hair-like microscale protrusion structure) on the inner wall of the sampling inlet 12 and the multi-channel interface control structure 3 inside the sampling container, the adhesion and retention of oily or adhesive components on the inner wall of the container are suppressed from both the interface contact state and the overall inertial flow of the liquid, thus maintaining the original composition state of the sample.

[0029] During transportation, the liquid inside the sample sampling container 11 may slosh due to changes in the sampler's posture or external vibrations. In this case, the multi-channel interface control structure 3 located inside the sample sampling container 11 disperses the sample into multiple fine-scale channels, thereby reducing the overall flow amplitude of the sample and decreasing the effective contact probability between the sample per unit volume and the inner wall of the sample sampling container 11.

[0030] The independent sample discharge path 13 keeps the sampling inlet 12 in a "no-out" working state, avoiding pollution and loss caused by the reverse flow of the sample after sampling, which is beneficial to the consistency and reliability of the sample under multiple sampling conditions.

[0031] In some embodiments, the fluid buffer shaping structure 2 has a streamlined, teardrop-shaped, or non-axisymmetric gradient geometry. During sampling, the sampler is mounted below a drone platform, and the drone flies above the target oily water body and hovers. An oil film or oil-water mixture exists on the surface of the target water body, and the liquid surface experiences slight fluctuations due to the natural environment or the drone's airflow disturbance. When the sampling inlet 12 approaches or contacts the liquid surface, the fluid buffer shaping structure 2, located at the front end of the sampling inlet 12, interacts with the external liquid first. Because the fluid buffer shaping structure 2 adopts the aforementioned non-cylindrical streamlined structure, it forms a non-periodic velocity gradient attenuation path between the sampling inlet 12 and the external liquid, passively weakening surface fluctuations and local disturbances before the liquid enters the sampling inlet 12, thereby stabilizing the liquid flow state entering the sampling inlet 12.

[0032] In a preferred embodiment, the characteristic length L of the fluid buffer shaping structure 2 s The dominant characteristic wavelength λ of the external liquid surface disturbance at sampling inlet 12 satisfies the following relationship: 0.1λ≤L s ≤1.5λ. In this embodiment, the measured dominant disturbance wavelength λ is 40mm, L s A value of 30 mm is used to satisfy the above relationship, so that external liquid disturbances are unfolded and velocity gradient attenuation occurs before entering the sampling inlet 12, thereby improving the sample introduction stability.

[0033] The inner wall of the fluid shaping zone 121 is a relatively smooth surface, which is used to maintain the continuity and stability of the liquid during the injection stage and avoid introducing additional fluid disturbances.

[0034] The inner wall of the interface inhibition region 122 is provided with non-roughened microscale protrusion structures, which are arranged in an array or aperiodic distribution. In some embodiments, the height and spacing of the microscale protrusions are smaller than the characteristic size of the sampling inlet 12, so that they do not form obvious fluid blockage or filtration effects, and only achieve hydrophobic or oleophobic enhancement effects by changing the interface contact state. In this embodiment, the height of the microscale protrusions is 0.05 mm, the spacing is 0.1 mm, and the diameter of the sampling inlet 12 is 5 mm.

[0035] Under the aforementioned conditions, the liquid sample enters the sampler body 1 in a relatively continuous and uniform manner, and then further enters the sample sampling container 11 to complete the collection.

[0036] In some embodiments, the multi-channel interface control structure 3 is in the form of a honeycomb, grid, or porous channel structure. The multi-channel interface control structure 3 is used to disperse the sample within multiple small-volume channels during the storage and transportation stages after sampling, thereby reducing the overall inertial flow of the sample and decreasing the probability of effective contact between the sample and the inner wall of the container.

[0037] In a preferred embodiment, the equivalent hydraulic diameter d of a single channel in the multi-channel interface control structure 3 h Smaller than the characteristic length L of the sample during transport to form an overall inertial flow. i , satisfying: d h <0.5L i Wherein, the feature length L i The sample volume, acceleration amplitude during transport, and container geometry all contribute to the difficulty of achieving overall reflux within a multi-channel structure. In this example, the total sample volume is 100 mL, the transport acceleration is 0.5 g, and the container diameter is 60 mm. The calculated L... i ≈12mm, d h Take 3mm, satisfying d h <6mm, making it difficult for the sample to form an overall reflux within the multi-channel structure.

[0038] Those skilled in the art can optimize the selection based on the actual disturbance characteristic wavelength. The equivalent hydraulic diameter d of the multi-channel interface control structure 3. h It should be less than 0.5L. i The specific value is determined based on the sample volume and transportation conditions.

[0039] Through the aforementioned structural effects, oily components or components with interfacial adsorption properties in the sample are less likely to form a continuous oil film or become significantly retained on the inner wall of the container during transportation, which helps to maintain the original composition of the sample.

[0040] In some embodiments, the sample sampling container 11 is disposed in the lower region of the sampler body 1, and the sampling inlet 12 and the fluid buffer shaping structure 2 are disposed in the upper region of the sampler body 1, such that the change in the overall center of gravity of the sampler during the increase of sample volume mainly occurs along the longitudinal axis. That is, as the sample volume gradually increases, the mass of the newly added sample is mainly concentrated near the longitudinal axis and distributed downwards, thereby reducing the impact of sample volume changes on the sampler's attitude stability. The above-mentioned center of gravity stabilization structure is achieved through the relative positional relationship between the sampler body 1 and the sample sampling container 11, without relying on an active adjustment mechanism or dynamic counterweight device.

[0041] In some embodiments, the fixed bracket 4 is offset from the axis of the sampling inlet 12 to avoid interference with the liquid flow field near the sampling inlet 12. Preferably, the fixed bracket 4 has a certain degree of adjustment freedom during the installation phase and is in a rigid locked state after installation, thereby maintaining the stability of the sampler's posture during sampling.

[0042] The sampler of this invention can be adapted to various external platforms via the fixed bracket 4: Drone Platform: The mounting bracket 4 is made of lightweight aluminum alloy, with an overall weight of less than 200g, and is connected to the drone via a quick-release interface.

[0043] Robotic arm platform: Fixed bracket 4 adopts a flange interface, which is directly connected to the flange at the end of the robotic arm and is rigidly locked.

[0044] Floating platform: An elastic damping element (rubber pad) is added between the fixed support 4 and the floating platform to isolate the platform from high-frequency wave vibrations. The fixed support 4 remains offset from the axis of the sampling inlet 12.

[0045] In some embodiments, the sample discharge path 13 is located in the upper region of the sample sampling container 11 and is independent of the sampling inlet 12. It is used to discharge the sample from the sample sampling container 11 after sampling is completed, so that the sampling inlet 12 remains in a "no-out" working state.

[0046] In a preferred embodiment, the sample discharge path 13 is located at a high position in the overall structure of the sampler body 1. By separating the sample discharge path 13 from the sampling inlet 12 in terms of structure and fluid path, the sampling inlet 12 is kept in a "no-exit" working state throughout the entire sampling and discharge process, thereby reducing the possibility of repeated wetting, oily component retention, or cross-contamination in the sampling inlet 12 area.

[0047] In a preferred embodiment, the sample discharge path 13 includes a discharge port 131 disposed on the top of the sampling container. The discharge port 131 may be fitted with a valve, a sealing plug, or an openable structure for releasing the sample when needed.

[0048] In another preferred embodiment, the sample discharge path 13 further includes a flow channel 132 disposed inside the sampling container, so that the sample flows along a predetermined path during the discharge process to further reduce sample residue.

[0049] By setting up the aforementioned independent sample discharge path 13 at the top, the sample no longer passes through the sampling inlet 12 and its internal flow shaping region 121 and interface suppression region 122 during the discharge stage, thereby maintaining the clean state of the sampling inlet 12 structure, which is beneficial to reduce sample loss and improve sample consistency and reliability under multiple sampling conditions.

[0050] In this embodiment, the sampling process does not require active valve control or complex control algorithms; stable sampling of oily water and maintenance of the sample interface can be achieved solely through the system structure itself. The specific steps are as follows: The sampler is installed under the drone platform using the mounting bracket 4. The installation position is adjusted and then locked.

[0051] The drone flies over the target oily water body and hovers, controlling the sampler to descend so that the sampling inlet 12 approaches or contacts the liquid surface.

[0052] The fluid buffer shaping structure 2 first comes into contact with the liquid, spreading and attenuating liquid surface fluctuations and airflow disturbances along its surface.

[0053] The liquid enters the sampling inlet 12 in a stable flow state, and passes sequentially through the smooth inner wall of the flow shaping zone 121 and the non-hair-like microscale protrusion structure of the interface inhibition zone 122.

[0054] The liquid enters the sample sampling container 11 and is dispersed into multiple fine-scale channels by the multi-channel interface control structure 3.

[0055] After sampling is completed, the drone returns carrying the sampler. During transportation, a multi-channel interface control structure 3 suppresses sample shaking and interface adsorption.

[0056] Upon arrival at the testing site, the sample is discharged through sample discharge path 13 (top discharge port 131), and the sampling inlet 12 is kept clean.

[0057] To verify the sample introduction stability and interfacial adsorption suppression effect of the structure of the present invention under perturbation conditions, the following comparative experiments were conducted.

[0058] Experimental setup: An oil-containing water body was constructed in a transparent water tank, with an oil film thickness of 0.5~1mm on the surface. A disturbance generator was placed at the bottom of the tank to generate a sinusoidal disturbance with an amplitude of ±10mm and a frequency of 2Hz to simulate liquid surface ripples. At the same time, a transverse airflow disturbance (wind speed 3m / s) was applied to the water surface.

[0059] Comparison objects: The sampler of this invention has a fluid buffer shaping structure 2 (L) s =30mm), sampling inlet 12-zone microstructure (fluid shaping zone 121 + interface suppression zone 122), multi-channel interface control structure 3 (honeycomb, d h =3 mm), independent emission path.

[0060] Comparison sampler: It does not have a fluid buffer shaping structure 2 and a multi-channel interface control structure 3. The inner wall of the sampling inlet 12 is a completely smooth surface and there is no independent discharge path (discharge and sampling share the same channel).

[0061] Experimental Method: Under the same disturbance amplitude and frequency conditions, 10 parallel samplings were performed using the sampler of this invention and a control sampler, with a target volume of 100 mL for each sampling. The actual injection volume for each sampling was recorded, and the fluctuation amplitude (standard deviation) was calculated. After sampling, oily residues were extracted from the inner wall of the sampling container and weighed.

[0062] Experimental results: The sample volume fluctuation range (standard deviation) of the sampler of the present invention is ±3.2 mL, while that of the comparative sampler is ±18.7 mL, which improves the sample volume stability of the sampler of the present invention by approximately 83%.

[0063] The oil residue on the inner wall of the sampler of the present invention is 0.05g, while that of the comparative sampler is 0.48g. The interface adsorption inhibition effect of the sampler of the present invention is improved by about 90%.

[0064] Conclusion: The sampler of the present invention significantly reduces the fluctuation range of the injection volume under disturbance conditions, and significantly reduces the amount of oil residue on the inner wall of the sampling container, proving the effectiveness of the fluid buffer shaping structure 2 and the multi-channel interface control structure 3.

[0065] In this embodiment, a high-speed camera is used to observe the flow near the sampling inlet 12 in order to verify the disturbance attenuation effect of the fluid buffer shaping structure 2.

[0066] Experimental setup: The sampler was fixed to a robotic arm, which moved up and down at a frequency of 0.5 Hz (simulating liquid surface ripples), while a lateral airflow disturbance (wind speed 3 m / s) was applied to the water surface. A high-speed camera captured the sampling inlet 12 area at a frame rate of 1000 frames per second.

[0067] Observation results: For the control sampler (fluid-free buffer shaping structure 2): external disturbances can be directly transmitted to the sampling inlet 12, and the liquid surface at the sampling inlet 12 shows obvious transient inrush (the liquid surface suddenly rises by about 15 mm) and flow interruption (the liquid surface suddenly drops by about 10 mm), and the flow is extremely unstable.

[0068] For the sampler of this invention: external disturbances are spread out and attenuated along the surface of the fluid buffer shaping structure 2. The liquid level fluctuation observed at the sampling inlet 12 is only ±2 mm, and no obvious instantaneous inrush or flow interruption is observed. The flow state near the sampling inlet 12 remains continuous and stable.

[0069] Conclusion: High-speed video observation results prove that the fluid buffer shaping structure 2 can effectively weaken the influence of external disturbances on the injection flow state and achieve passive flow state stabilization during the injection stage.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A sampler with passive flow regime control and resistance to interfacial adsorption, characterized in that, include: The sampler body (1) is provided with a sample sampling container (11) and a sampling inlet (12) and a sample discharge path (13) connected to the sample sampling container (11). The sample discharge path (13) and the sampling inlet (12) are set independently of each other. The interior of the sampling inlet (12) is divided into a flow shaping zone (121) and an interface inhibition zone (122) along the liquid entry direction. The inner wall of the flow shaping zone (121) is a smooth surface, and the inner wall of the interface inhibition zone (122) is provided with a non-textured microscale protrusion structure. A fluid buffer shaping structure (2) is disposed outside the sampling inlet (12) or at the front end of the sampling inlet (12) channel. The fluid buffer shaping structure (2) is a non-cylindrical symmetric structure. The geometric axis of the fluid buffer shaping structure (2) is offset from the axis of the sampling inlet (12). It is used to make the external liquid form a non-periodic velocity gradient decay path along the surface of the fluid buffer shaping structure (2) before entering the sampling inlet (12) during the sampling process. A multi-channel interface control structure (3) is disposed inside the sample sampling container (11). The multi-channel interface control structure (3) is made of inert material and forms multiple parallel or connected fine-scale channels for dispersing the sample in the multiple fine-scale channels. A fixed bracket is provided on the sampler body (1) for connecting to an external platform.

2. The sampler according to claim 1, characterized in that, The fluid buffer shaping structure (2) has a streamlined, teardrop-shaped or non-axisymmetric gradient geometry.

3. The sampler according to claim 1, characterized in that, The characteristic length L of the fluid buffer shaping structure (2) s The dominant characteristic wavelength λ of the external liquid surface disturbance at the sampling inlet (12) satisfies the following relationship: 0.1λ≤L s ≤1.5λ.

4. The sampler according to claim 1, characterized in that, The microscale protrusions on the inner wall of the interface suppression zone (122) are arranged in an array or a non-periodic distribution, and the height and spacing of the microscale protrusions are smaller than the characteristic size of the sampling inlet (12), so that they do not form fluid blockage or filtration effect.

5. The sampler according to claim 1, characterized in that, The multi-channel interface control structure (3) has a honeycomb, grid, or porous channel structure.

6. The sampler according to claim 1, characterized in that, The equivalent hydraulic diameter d of a single channel in the multi-channel interface control structure (3) h Smaller than the characteristic length L of the sample during transport to form an overall inertial flow. i , satisfying: d h <0.5L i .

7. The sampler according to claim 1, characterized in that, The sample sampling container (11) is located in the lower region of the sampler body (1), and the sampling inlet (12) and the fluid buffer shaping structure (2) are located in the upper region of the sampler body (1), so that the change in the overall center of gravity of the sampler mainly occurs along the longitudinal axis direction during the increase of sample volume.

8. The sampler according to claim 1, characterized in that, The fixed bracket (4) is offset from the axis of the sampling inlet (12), and the fixed bracket (4) has an adjustable degree of freedom during the installation stage and is in a rigid locking state after the installation is completed.

9. The sampler according to claim 1, characterized in that, The sample discharge path (13) is located in the upper region of the sample sampling container (11) and is independent of the sampling inlet (12). It is used to discharge the sample from the sample sampling container (11) after sampling is completed, so that the sampling inlet (12) remains in a "no discharge" working state.

10. A sampling method for passive flow regime control and anti-interfacial adsorption using the sampler described in any one of claims 1 to 9, characterized in that, Includes the following steps: The sampling inlet is brought into contact with the liquid to be sampled. The fluid buffer and shaping structure disperses and attenuates the liquid surface fluctuations and external disturbances, making the liquid flow state entering the sampling inlet tend to be stable. The liquid sequentially passes through the flow shaping zone and the interface inhibition zone within the sampling inlet. The flow shaping zone maintains the continuity of the liquid, while the interface inhibition zone reduces the wetting and retention of the liquid on the inner wall of the sampling inlet through non-textured microscale protrusion structures. After the liquid enters the sample sampling container, the sample is dispersed in multiple fine-scale channels through a multi-channel interface control structure, which weakens the overall inertial flow of the sample and reduces the probability of effective contact between the sample and the inner wall of the container. After sampling is completed, the sample is discharged through the sample discharge path, keeping the sampling inlet in a "no-out" working state.

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