Water quality sampling equipment for monitoring petroleum pollutants
By incorporating a float assembly, an automatic opening and closing mechanism, and a servo motor-driven pumping turbine design, the problems of low sampling efficiency and insufficient equipment adaptability in petroleum pollutant monitoring have been solved, enabling efficient and accurate water quality sampling and monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-03-31
AI Technical Summary
Current methods for monitoring petroleum pollutants suffer from low sampling efficiency, difficulty in accurately determining the optimal timing, interference from human intervention, and time-consuming and costly traditional detection methods. These methods also fail to achieve high-frequency and all-weather on-site monitoring, and the equipment lacks adaptability and reliability.
A water quality sampling device for monitoring petroleum pollutants was designed. It uses a float component and an automatic opening and closing component to enable the device to automatically open or close the sampling channel according to water level changes. An internal annular filter plate filters impurities, and a servo motor-driven pumping turbine fan performs efficient sampling. The inner sampling tank and the end cap are connected by threads for convenient sampling.
It enables unattended, efficient, and accurate sampling around the clock, ensuring sample purity and the reliability of monitoring data, improving sampling efficiency and equipment adaptability, simplifying operating procedures, and reducing the risk of sample contamination.
Smart Images
Figure CN121762278A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water quality sampling equipment technology, and more specifically, to a water quality sampling device for monitoring petroleum pollutants. Background Technology
[0002] In the monitoring of petroleum pollutants, accurate and efficient collection of representative water samples is a crucial prerequisite for obtaining reliable monitoring data. Currently, water sampling still largely relies on manual operation. This traditional method suffers from problems such as low sampling efficiency and difficulty in accurately determining the optimal sampling time (e.g., when pollutant peaks occur). Furthermore, human operation inevitably introduces interference during the sampling process, such as sample contamination or uneven mixing, which can easily affect the representativeness of the samples and the accuracy of the analytical results.
[0003] In terms of measurement techniques, current methods for determining petroleum pollutants in water bodies mainly employ gravimetric methods, gas chromatography, infrared spectrophotometry, ultraviolet spectrophotometry, and fluorescence spectrophotometry. However, the vast majority of these methods are offline laboratory detection techniques. Their standard procedures typically require personnel to collect water samples on-site, transport the samples to the laboratory, and then undergo complex pretreatment steps such as organic solvent extraction before measurement. This process is not only time-consuming, costly in terms of manpower and reagents, and cumbersome, but more importantly, it makes it difficult to achieve in-situ, high-frequency, and continuous monitoring of the water body under test. This lag results in an inability to reflect the true changes in the water body's pollution status in a timely and dynamic manner, especially when responding to sudden oil spill incidents, where its limitations are particularly pronounced.
[0004] In practical applications, monitoring petroleum pollutants faces complex and variable aquatic environments, posing significant challenges to the adaptability and reliability of sampling equipment. First, in many water bodies, especially near the shore, estuaries, or outfalls, the water often contains large amounts of suspended solids, algae, or other impurities, which can easily clog the inlet or flow path of the sampling equipment, leading to sampling failure or sample distortion. Second, the hydrological parameters such as water flow velocity and water depth vary greatly across different water bodies, requiring sampling equipment to have corresponding adjustment and adaptability capabilities. For example, it must be able to automatically adjust the sampling depth according to the water level or maintain a stable sampling volume under different flow velocities to ensure the spatiotemporal representativeness of the collected samples.
[0005] With increasingly stringent environmental protection regulations and ever-growing demands for precise pollution control, the market has set higher standards for the real-time performance, accuracy, and efficiency of petroleum pollutant monitoring. Therefore, developing a device that can operate automatically, is highly efficient and reliable, adaptable to complex aquatic environments, and accurately collect water samples containing petroleum pollutants is of paramount importance for improving environmental monitoring capabilities and emergency response levels. Summary of the Invention
[0006] The purpose of this invention is to solve the technical problems mentioned in the background section and to provide a water quality sampling device for monitoring petroleum pollutants.
[0007] The objective of this invention is achieved through the following technical solution:
[0008] A water quality sampling device for monitoring petroleum pollutants includes an outer sampling tank, an automatic opening and closing component fixedly connected to the top surface of the outer sampling tank, a float component connected to the top surface of the automatic opening and closing component, an inner sampling tank disposed in the inner cavity of the outer sampling tank, and a liquid suction component disposed in the inner cavity of the inner sampling tank.
[0009] The outer sampling container includes an outer container and an annular filter plate fixedly connected to the upper part of the inner cavity of the outer container;
[0010] The automatic opening and closing component includes a lifting beam, a waterproof electric actuator fixed to the bottom surface of the lifting beam, and a blocking plate connected to the telescopic end of the waterproof electric actuator.
[0011] The float assembly includes a float airbag and an iron chain connected to the top surface of the float airbag.
[0012] The inner sampling container includes an inner container, an end cap screwed onto the top port of the inner container, and a liquid inlet fixed to the bottom end face of the end cap.
[0013] The liquid suction component includes a top shell and a bottom shell, and a servo motor fixed on the upper surface of the top shell. The output shaft of the servo motor is connected to a drive shaft, and the bottom end of the drive shaft is connected to a water-pumping turbine fan. A water-pumping nozzle is provided on the inner side wall of the top shell, and the end of the water-pumping nozzle is connected to a water-pumping pipe.
[0014] In the above technical solution, preferably, a wide-mouth edge is fixedly connected to the top port edge of the outer tank, and the top edge of the wide-mouth edge extends outward to guide water into the interior of the outer tank.
[0015] In the above technical solution, preferably: the outer ring surface of the annular filter plate is fixedly connected to the upper part of the inner cavity side wall of the outer tank, and the inner ring surface of the annular filter plate is in contact with the outer ring surface of the inner tank.
[0016] In the above technical solution, preferably: the lifting beam is in the shape of an inverted U, and the bottom two ends of the lifting beam are fixedly connected to the left and right sides of the outer ring of the outer tank, and the outer ring surface of the sealing ring is in contact with the inner wall of the top port of the outer tank.
[0017] In the above technical solution, preferably, a sealing groove is formed on the outer surface of the blocking plate for the sealing ring to be embedded and fixed.
[0018] In the above technical solution, preferably, the end of the iron chain away from the float airbag is fixedly connected to the top surface of the suspension beam.
[0019] In the above technical solution, preferably: the top port of the inner can is threaded, and the bottom of the outer ring of the end cap is threaded to match the top port of the inner can, so that the end cap can be screwed on to remove the sample after the inner can is filled with the sample.
[0020] In the above technical solution, preferably, 6-10 water inlets are arranged in a ring array on the outer sidewall of the inlet nozzle for allowing the sample to enter the inner tank, and the bottom end face of the inlet nozzle is in contact with the bottom sidewall of the inner cavity of the outer tank.
[0021] In the above technical solution, preferably: a support plate is fixedly connected to the bottom surface of the bottom shell, and the end of the support plate away from the bottom shell is fixedly connected to the inner cavity side wall of the inner tank. The top shell and the bottom shell are locked together by several screws, and there are outlets on the side walls of the top shell and the bottom shell for the sample to flow into the inner tank.
[0022] In the above technical solution, preferably: the outer end face of the servo motor is fixedly connected to the upper surface of the top shell, the output shaft of the servo motor is connected to the top end of the transmission shaft through a coupling, the water pumping turbine is located between the top shell and the bottom shell, and the sealing disc is fixedly connected above the inner cavity of the liquid inlet, and the end of the water pumping pipe away from the water pumping nozzle passes through the sealing disc to the lower part of the inner cavity of the liquid inlet.
[0023] As can be seen from the above technical solution, the water quality sampling device for monitoring petroleum pollutants provided by the present invention has the following beneficial effects compared with the prior art:
[0024] 1. Strong intelligence and adaptability: Through the ingenious cooperation of the float component and the automatic opening and closing component, the device can respond to water level changes in real time and automatically open or close the sampling channel. This not only eliminates cumbersome manual intervention and realizes unattended operation around the clock, but also accurately captures pollutant samples under specific water depths or hydrological conditions, significantly improving the timeliness and representativeness of sampling.
[0025] 2. Outstanding Sample Pretreatment and Anti-interference Capabilities: The annular filter plate built into the device of this invention effectively intercepts large suspended solids, algae, and other impurities in the water at the initial sampling stage, preventing them from entering the inner sampling tank. This design ensures the purity of the sample from the source, avoiding measurement errors caused by impurities during subsequent testing, thereby ensuring the accuracy and reliability of the monitoring data.
[0026] 3. High sampling efficiency and controllable power: The device of this invention uses a suction component composed of a servo motor-driven water turbine fan, which can actively and quickly guide water flow into the sampling tank. Compared with traditional devices that rely on natural osmosis or static pressure sampling, this invention significantly shortens the single sampling time and improves sampling efficiency. At the same time, the precise control characteristics of the servo motor allow the sampling flow rate to be adjusted as needed, enhancing the adaptability of the device to water bodies with different flow rates.
[0027] 4. Excellent combination of sealing and ease of operation: The inner sampling container and end cap of this invention are connected by threads, which not only ensures good sealing during sampling and storage, effectively preventing sample volatilization and external contamination, but also allows for convenient sample removal by simply unscrewing the end cap. This design simplifies the subsequent sample transfer process, improves work efficiency, and reduces the risk of sample contamination during operation.
[0028] 5. Fluid dynamics design optimization: The wide-mouth edge design of the top of the outer sampling tank of this invention conforms to the principles of fluid dynamics, which can efficiently guide and collect water flow into the equipment, reduce water flow resistance, and further improve the overall water intake efficiency in conjunction with the liquid suction component, ensuring that sufficient and representative water samples are obtained in a short time.
[0029] In summary, through the synergistic effect of the above-mentioned components and the scientific and reasonable overall structural design, this invention has successfully achieved automatic, efficient, accurate and reliable collection of petroleum pollutant water samples, effectively overcoming the inherent defects of traditional sampling methods and better meeting the needs of modern environmental monitoring for high precision and high efficiency. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced and explained below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the overall structure of a water quality sampler;
[0032] Figure 2 This is a schematic diagram of the interior of the outer sampling container;
[0033] Figure 3 This is a schematic diagram of the automatic opening / closing mechanism and the float mechanism;
[0034] Figure 4 This is a schematic diagram of the automatic opening and closing mechanism;
[0035] Figure 5This is a schematic diagram of the float component;
[0036] Figure 6 This is a schematic diagram of the interior of the inner sampling container;
[0037] Figure 7 This is a schematic diagram of the liquid suction device inside the inner sampling tank.
[0038] Appendix Figure 1 -Appendix Figure 7 The correspondence between the components is as follows:
[0039] 1. Outer sampling tank; 11. Outer tank; 12. Annular filter plate; 13. Wide opening edge; 2. Automatic opening and closing component; 21. Lifting beam; 22. Waterproof electric actuator; 23. Blocking plate; 24. Sealing ring; 3. Float component; 31. Float airbag; 32. Iron chain; 4. Inner sampling tank; 41. Inner tank; 42. End cap; 43. Liquid inlet; 44. Water inlet; 5. Liquid suction component; 51. Top shell; 52. Servo motor; 53. Water suction nozzle; 54. Water suction pipe; 55. Sealing plate; 56. Support plate; 57. Water outlet; 58. Bottom shell; 59. Water suction turbine fan; 510. Drive shaft. Detailed Implementation
[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. In order to provide a clearer explanation and description of the technical solutions and implementation methods of the present invention, the following describes specific embodiments that implement the preferred technical solutions of the present invention.
[0041] Example 1: The water quality sampling device for monitoring petroleum pollutants in this example includes an outer sampling tank 1, which comprises an outer tank 11. A wide-mouth edge 13 is fixedly connected to the top port edge of the outer tank 11, and the top edge of the wide-mouth edge 13 extends outward to guide water into the interior of the outer tank 11. An annular filter plate 12 is fixedly connected to the upper part of the inner cavity of the outer tank 11, and the outer surface of the annular filter plate 12 is fixedly connected to the upper part of the inner side wall of the outer tank 11.
[0042] An automatic opening and closing component 2 is fixedly connected to the top surface of the outer sampling tank 1. The lifting beam 21 of the automatic opening and closing component 2 is in an inverted U-shape, and its bottom ends are fixedly connected to the left and right sides of the outer ring of the outer tank 11. A waterproof electric actuator 22 is fixed to the bottom surface of the lifting beam 21. The telescopic end of the waterproof electric actuator 22 is connected to a blocking plate 23. A sealing groove is opened on the outer ring surface of the blocking plate 23 for embedding and fixing a sealing ring 24. The outer ring surface of the sealing ring 24 contacts the inner wall of the top port of the outer tank 11.
[0043] The top surface of the automatic opening and closing component 2 is connected to the float component 3, the top surface of the float airbag 31 of the float component 3 is connected to the iron chain 32, and the end of the iron chain 32 away from the float airbag 31 is fixedly connected to the top surface of the hanging beam 21.
[0044] An inner sampling tank 4 is installed inside the outer sampling tank 1. The inner tank 41 of the inner sampling tank 4 has a thread on the inner side of the top port. The bottom of the outer ring of the end cap 42 has a thread that matches the top port of the inner tank 41. The bottom end face of the end cap 42 is fixed with a liquid inlet 43. The outer side wall of the liquid inlet 43 has 8 water inlets 44 arranged in a ring array. The bottom end face is in contact with the bottom side wall of the inner cavity of the outer tank 11.
[0045] A liquid suction component 5 is installed inside the inner cavity of the inner sampling tank 4. A servo motor 52 is fixed to the upper surface of the top shell 51 of the liquid suction component 5. The outer end face of the servo motor 52 is fixedly connected to the upper surface of the top shell 51. The output shaft is connected to the top end of the drive shaft 510 through a coupling. A water pumping turbine fan 59 is connected to the bottom end of the drive shaft 510. The water pumping turbine fan 59 is located between the top shell 51 and the bottom shell 58. A water suction nozzle 53 is installed on the inner side wall of the top shell 51. The end of the water suction nozzle 53 is connected to a water suction pipe 54. A support plate 56 is fixed to the bottom surface of the bottom shell 58. The end of the support plate 56 away from the bottom shell 58 is fixedly connected to the inner cavity side wall of the inner tank 41. The top shell 51 and the bottom shell 58 are locked together by several screws. A water outlet 57 is opened on the side wall. A sealing disc 55 is fixedly connected above the inner cavity of the liquid inlet 43. The end of the water suction pipe 54 away from the water suction nozzle 53 passes through the sealing disc 55 to the bottom of the inner cavity of the liquid inlet 43.
[0046] In use, the device is placed in water, and the float airbag 31 makes the device float. Water enters the outer tank 11 through the wide opening 13, is filtered by the annular filter plate 12, and then enters the inner tank 41. The servo motor 52 is started, driving the water pumping turbine fan 59 to rotate. Water enters the liquid inlet 43 through the water inlet 44, flows through the water pumping pipe 54 and the water pumping nozzle 53 into the space between the top shell 51 and the bottom shell 58, and then enters the inner tank 41 through the water outlet 57. After sampling is completed, the waterproof electric actuator 22 is retracted, causing the blocking plate 23 to rise to prevent water from continuing to enter. The end cap 42 is then screwed on to remove the sample.
[0047] Example 2: This example is basically the same as Example 1, except that the outer sidewall of the inlet nozzle 43 has six inlets 44 arranged in a ring array. During the sampling process, due to the reduced number of inlets 44, the water flow rate into the inner tank 41 is relatively slow, which is suitable for scenarios where the water flow rate requirement is not high and more detailed sampling is required. The connection method and function of other components are the same as in Example 1. The device is floated by the float airbag 31, impurities are filtered by the annular filter plate 12, and sampling is achieved by the servo motor 52 driving the water pumping turbine fan 59. After sampling, the device is operated by the waterproof electric actuator 22 and the end cap 42.
[0048] Example 3: This example is also based on the above-described device structure, but differs in that the inner tank 41 has a threaded opening on the inner side of its top port, and the end cap 42 has a threaded opening on its outer ring bottom that matches the top port of the inner tank 41. However, the end cap 42 and the inner tank 41 are screwed together using a quick-screwing mechanism, facilitating rapid sample retrieval in emergencies. During sampling, after the device is placed in water, water enters the outer tank 11 through the wide opening 13, is filtered by the annular filter plate 12, and then, driven by the servo motor 52 and the pumping fan 59, the water enters the inlet 44 through the liquid inlet 43, and then enters the inner tank 41 through the suction nozzle 53 and the outlet 57. After sampling is completed, the sample is retrieved by quickly screwing on the end cap 42, improving sampling efficiency.
[0049] Based on the above-described technical solution, the workflow of this technical solution is explained as follows:
[0050] The entire device is placed in the water area to be sampled. At this time, the float bladder 31 of the float component 3 begins to float due to the buoyancy of the water. Since one end of the iron chain 32 is connected to the top surface of the float bladder 31 and the other end is fixedly connected to the top surface of the lifting beam 21, the floating of the float bladder 31 will cause the iron chain 32 to be in a relatively stretched state. At the same time, the lifting beam 21, as the supporting structure of the automatic opening and closing component 2, is in a relatively fixed position. As the tension generated by the floating of the float bladder 31 changes, it provides conditions for the subsequent action of the automatic opening and closing component 2. During the sinking process of the device, when the water level rises to a certain height, the waterproof electric actuator 22 of the automatic opening and closing component 2 starts to work. The telescopic end of the waterproof electric actuator 22 retracts, causing the blockage plate 23 connected to it to move upward. The sealing ring 24 on the outer surface of the blockage plate 23 was originally in close contact with the inner wall of the top port of the outer tank 11, playing a sealing role. At this time, the sealing ring 24 is disengaged as the blockage plate 23 moves, and the top port of the outer tank 11 opens. Under its own weight and water pressure, water enters the outer tank 11 through the wide opening 13 fixedly connected to the top port edge. The design of the wide opening 13 extending outward from the top edge better guides the water flow into the outer tank 11. The water entering the outer tank 11 first passes through the annular filter plate 12 fixedly connected to the upper part of the inner cavity of the outer tank 11. The outer surface of the annular filter plate 12 is fixedly connected to the upper part of the inner wall of the outer tank 11, and the inner surface is in contact with the outer surface of the inner tank 41 of the inner sampling tank 4. After being filtered by the annular filter plate 12 and removing larger impurity particles, the water enters the space where the inner tank 41 is located.
[0051] Simultaneously, the suction component 5 begins operation, and the servo motor 52, fixed to the upper surface of the top shell 51, starts. The output shaft of the servo motor 52 drives the transmission shaft 510 to rotate via a coupling. The pumping turbine fan 59, connected to the bottom end of the transmission shaft 510, rotates accordingly. The pumping turbine fan 59 is located between the top shell 51 and the bottom shell 58, and under the rotation of the pumping turbine fan 59, suction is generated. Water enters the interior of the inlet 43 through the inlet ports 44 arranged in a ring array on the outer sidewall of the inlet 43. The bottom end face of the inlet 43 contacts the bottom sidewall of the inner cavity of the outer tank 11, ensuring that the inlet ports 44 can fully contact the water. Water entering the inlet 43 is drawn in through the suction pipe 54. The end of the suction pipe 54 away from the inlet 43 passes through a sealing plate 55 fixedly connected above the inner cavity of the inlet 43 to below the inner cavity. Water enters the suction pipe 54 and then the suction pipe 53, which is located on the inner side wall of the top shell 51. After entering between the top shell 51 and the bottom shell 58, the water flows out through the outlet 57 on the side walls of the top and bottom shells and into the inner tank 41, completing the sampling process. After sampling, the equipment is removed from the water. Since the inner tank 41 has threads on the inner side of its top port, and the end cap 42 has threads on its outer ring bottom that match the top port of the inner tank 41, the operator can unscrew the end cap 42 to remove it from the top port of the inner tank 41, thereby extracting the petroleum-contaminated water sample collected from the inner tank 41 for subsequent monitoring and analysis.
[0052] This invention is not limited to the preferred embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Finally, it should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this application, should still fall within the scope of the technical content disclosed in this application.
Claims
1. A water quality sampling device for monitoring petroleum pollutants, comprising an outer sampling tank (1), characterized in that, An automatic opening and closing component (2) is fixedly connected to the top surface of the outer sampling tank (1), and a float component (3) is connected to the top surface of the automatic opening and closing component (2). An inner sampling tank (4) is provided in the inner cavity of the outer sampling tank (1), and a liquid suction component (5) is provided in the inner cavity of the inner sampling tank (4). The outer sampling container (1) includes an outer container (11) and an annular filter plate (12) fixedly connected to the upper part of the inner cavity of the outer container (11); The automatic opening and closing component (2) includes a lifting beam (21), a waterproof electric actuator (22) fixed to the bottom surface of the lifting beam (21), and a blocking plate (23) connected to the telescopic end of the waterproof electric actuator (22). The float component (3) includes a float airbag (31) and an iron chain (32) connected to the top surface of the float airbag (31); The inner sampling tank (4) includes an inner tank (41), an end cap (42) screwed onto the top port of the inner tank (41), and an inlet nozzle (43) fixed to the bottom end face of the end cap (42). The liquid suction component (5) includes a top shell (51) and a bottom shell (58), and a servo motor (52) fixed on the upper surface of the top shell (51). The output shaft of the servo motor (52) is connected to a transmission shaft (510). The bottom end of the transmission shaft (510) is connected to a water-pumping turbine fan (59). A water-pumping nozzle (53) is provided on the inner side wall of the top shell (51), and the end of the water-pumping nozzle (53) is connected to a water-pumping pipe (54).
2. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The top port edge of the outer tank (11) is fixedly connected with a wide-mouth edge (13), and the top edge of the wide-mouth edge (13) extends outward to guide water into the interior of the outer tank (11).
3. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The outer ring surface of the annular filter plate (12) is fixedly connected to the upper part of the inner cavity side wall of the outer tank (11), and the inner ring surface of the annular filter plate (12) is in contact with the outer ring surface of the inner tank (41).
4. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The lifting beam (21) is in the shape of an inverted U, and the bottom two ends of the lifting beam (21) are fixedly connected to the left and right sides of the outer ring of the outer tank (11). The outer ring surface of the sealing ring (24) is in contact with the inner wall of the top port of the outer tank (11).
5. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, A sealing groove is formed on the outer surface of the blocking plate (23) for the sealing ring (24) to be inlaid and fixed.
6. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The end of the chain (32) away from the float airbag (31) is fixedly connected to the top surface of the suspension beam (21).
7. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The inner can (41) has a thread on the inside of the top port, and the bottom of the outer ring of the end cap (42) has a thread that matches the top port of the inner can (41), so that the end cap (42) can be screwed on to take out the sample after the inner can (41) is filled with the sample.
8. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The outer sidewall of the inlet nozzle (43) has 6-10 inlets (44) arranged in a ring array for allowing the sample to enter the inner tank (41), and the bottom end face of the inlet nozzle (43) is in contact with the bottom sidewall of the inner cavity of the outer tank (11).
9. The water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, A support plate (56) is fixedly connected to the bottom surface of the bottom shell (58). The end of the support plate (56) away from the bottom shell (58) is fixedly connected to the inner cavity side wall of the inner tank (41). The top shell (51) and the bottom shell (58) are locked together by several screws. The side walls of the top shell (51) and the bottom shell (58) have outlets (57) for the sample to flow into the inner tank (41).
10. A water quality sampling device for monitoring petroleum pollutants according to claim 1, characterized in that, The outer end face of the servo motor (52) is fixedly connected to the upper surface of the top shell (51). The output shaft of the servo motor (52) is connected to the top end of the transmission shaft (510) through a coupling. The pumping turbine fan (59) is located between the top shell (51) and the bottom shell (58). The sealing disc (55) is fixedly connected above the inner cavity of the inlet nozzle (43). The end of the pumping pipe (54) away from the pumping nozzle (53) passes through the sealing disc (55) to the lower part of the inner cavity of the inlet nozzle (43).