A sewage treatment sampling device

Abstract

The present application relates to sewage treatment technical field, provide a kind of sampling device for sewage treatment, including main structure, sampling pipe, liquid outlet pipe, flow guide rectifier structure, filter flow guide structure, flow guide cylinder, impeller, throttle valve and first flow guide cover.The four major functional modules of filter flow guide, rectifier steady flow, active suction and flow control are integrated in a compact sampling head in the present application, when impeller rotates in flow guide cylinder, it can generate stable axial suction force, and the suction force is transmitted to filter flow guide structure through flow guide rectifier structure, change "passive suction" into "active grabbing", and the sampling efficiency is strengthened when deep water sampling;At the same time, the present application can shape, rectify the active flow field of water flow entering the pipeline, can convert irregular turbulent pulsation into directional, uniform axial flow, with the advantages of stable flow direction, weak transverse mixing and few bubbles.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a sampling device for wastewater treatment. Background Technology

[0002] Regular and accurate collection of representative water samples from wastewater treatment plants, discharge outlets, and natural water monitoring points is the foundation for water quality analysis, process control, and environmental compliance assessment.

[0003] Traditional sampling devices often rely on the negative pressure of an external suction pump, with water passively flowing through the sampling port. For example, Chinese patent CN221404866U discloses a wastewater treatment sampling device, including a first vertical plate, a handle, and a rubber sleeve. A sampling mechanism is installed on the right side of the first vertical plate, comprising a first pipe and a second pipe connected to the suction port and outlet of a water pump, respectively. The other ends of the first and second pipes are connected to a suction head and a third pipe. This patent relies entirely on the negative pressure generated by the water pump to draw water samples. This purely passive suction method not only suffers from severe efficiency degradation in deep water sampling but also lacks the ability to actively shape the flow field of the water entering the pipe, easily inducing strong turbulence. This turbulence causes violent lateral movement and mixing of liquid particles, resulting in an extremely unstable flow field. More seriously, the strong turbulence can carry a large number of air bubbles, causing the already flocculated suspended solid particles to break up and become unevenly distributed.

[0004] Therefore, it is necessary to design a sampling device for wastewater treatment to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The present invention aims to provide a sampling device for wastewater treatment.

[0006] This invention provides a sampling device for wastewater treatment, comprising:

[0007] The main structure includes a hollow sampling tube. The top side wall of the sampling tube is provided with a liquid outlet tube for connection with the suction assembly, and the bottom surface is provided with a through-hole. The upper and lower sides of the through-hole are respectively connected to a flow guiding and rectifying structure and a filter flow guiding structure. A flow guide tube is connected to the flow guiding and rectifying structure. Rotatable impellers are spaced apart inside the tube. The top of the tube is connected to the small end of the first flow guide shroud through a throttling valve. The large end of the first flow guide shroud is connected to the inner wall of the sampling tube.

[0008] According to the present invention, a sampling device for wastewater treatment is provided, wherein the impeller is mounted on a vertically arranged drive shaft, the bottom of the drive shaft extends downward and is rotatably connected to a connecting ring structure, the connecting ring structure is connected to the through opening; the bottom surface of the connecting ring structure is connected to a closed mounting chamber, the mounting chamber is provided with a rotary drive component, and the output shaft of the rotary drive component is poweredly connected to the drive shaft.

[0009] According to a wastewater treatment sampling device provided by the present invention, the connecting ring structure includes a ring body connected to the inner wall of the through-hole, the inner wall of the ring body is provided with a plurality of connecting spokes spaced apart along the circumference, the ends of the plurality of connecting spokes are connected to a connecting block, and the mounting chamber is connected to the bottom surface of the connecting block.

[0010] According to the present invention, a sampling device for wastewater treatment has a plurality of heat dissipation fins connected to the outer wall of the installation chamber.

[0011] According to a wastewater treatment sampling device provided by the present invention, the side wall of the guide tube is provided with a plurality of pressure relief holes spaced apart along the circumference, and the plurality of pressure relief holes are all located above the impeller.

[0012] According to a wastewater treatment sampling device provided by the present invention, the axis of the pressure relief hole is inclined toward the throttling valve, and a flared mouth is provided at its inner end, and the inner side of the flared mouth is covered with an anti-clogging filter screen.

[0013] According to the present invention, a sampling device for wastewater treatment includes a flow guiding and rectifying structure comprising a second flow guiding hood, the small end of which is connected to the outer edge of the top surface of the through-hole, and the large end of which is connected to the rectifying grid. The flow guiding cylinder is connected to the rectifying grid.

[0014] According to a wastewater treatment sampling device provided by the present invention, the filtration and flow guiding structure includes a third flow guiding hood, the small end of the third flow guiding hood being connected to the outer edge of the bottom surface of the through-hole, and the large end extending downward and detachably connected to a filter hood.

[0015] According to the present invention, a wastewater treatment sampling device further includes a cleaning structure, the cleaning structure including a liquid distribution plate disposed inside the sampling tube, the liquid distribution plate being located above the liquid outlet pipe, the top of which is provided with an inlet pipe for connection with a rinsing assembly, and multiple nozzles spaced apart on the side walls and bottom surface.

[0016] According to the present invention, a sampling device for wastewater treatment includes a base, a mounting frame connected to the base, a height adjustment component provided on the mounting frame, and an actuating end of the height adjustment component connected to the sampling tube.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: This invention integrates four functional modules—filtration and flow guidance, rectification and stabilization, active suction, and flow control—into a compact sampling head. The impeller is not merely a conveying component but serves as a built-in active power source. When the impeller rotates within the guide tube, it generates stable axial suction. This suction is transmitted to the filtration and flow guidance structure through the flow guidance and rectification structure, transforming "passive suction" into "active grasping," thus enhancing sampling efficiency in low-velocity or still water areas. Simultaneously, in this invention, the water flow sequentially undergoes preliminary filtration and guidance through the filtration and flow guidance structure, rectification and laminarization through the flow guidance and rectification structure, stable suction and pressurization by the impeller, and finally, precise control through the throttle valve. This path shapes and rectifyes the active flow field of the water entering the pipe, transforming irregular turbulent pulsations into directional, uniform axial flow, offering advantages such as stable flow direction, weak lateral mixing, and fewer air bubbles.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of a sampling device for wastewater treatment provided in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the main structure provided in an embodiment of the present invention; Figure 3 This is a planar sectional view of the sampling tube provided in an embodiment of the present invention; Figure 4 This is a planar sectional view of the bottom of the sampling tube provided in an embodiment of the present invention; Figure 5 This is the present invention. Figure 3 A magnified view of part A in the middle; Figure 6 This is a three-dimensional structural diagram of the connecting ring structure provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Main structure; 101. Base; 102. Mounting bracket; 103. Lead screw; 104. Shaft plate; 105. Slider; 106. Guide rod; 2. Sampling tube; 3. Liquid outlet pipe; 4. Flow guiding and rectifying structure; 41. Second flow guide shroud; 42. Rectifying grid; 5. Filter flow guiding structure; 51. Third flow guide shroud; 52. Filter shroud; 6. Flow guide cylinder; 601. Pressure relief hole; 7. Impeller; 8. Throttling valve; 9. First flow guide shroud; 10. Drive shaft; 11. Connecting ring structure; 111. Ring body; 112. Connecting spokes; 113. Connecting block; 12. Mounting chamber; 13. Rotary drive component; 14. Heat dissipation fins; 15. Anti-clogging filter screen; 16. Cleaning structure; 161. Liquid distribution tray; 162. Liquid inlet pipe; 163. Nozzle. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example This invention provides a sampling device for wastewater treatment. Please refer to [link / reference]. Figures 1-4 The system includes a main structure 1, on which a hollow sampling tube 2 is provided. The top side wall of the sampling tube 2 is provided with a liquid outlet tube 3 for connection with the suction assembly, and the bottom surface is provided with a through-hole. The upper and lower sides of the through-hole are respectively connected to a corresponding flow guiding and rectifying structure 4 and a filter flow guiding structure 5. The flow guiding cylinder 6 is connected to the flow guiding and rectifying structure 4, and rotatable impellers 7 are provided inside it at intervals. The top is connected to the small end of the first flow guiding shroud 9 through a throttle valve 8, and the large end of the first flow guiding shroud 9 is connected to the inner wall of the sampling tube 2.

[0024] In this embodiment, during sampling, the suction assembly is connected to and activated with the outlet pipe 3, the throttle valve 8 is opened, the filter guide structure 5 is used to filter the water sample and guide the filtered water sample to the through-hole, and the guide and rectify structure 4 is used to guide the water sample at the through-hole into the sampling tube 2 and rectify it; the rectified water sample enters the guide cylinder 6, and through the rotation of the impeller 7, it can do work on the water flow and generate a stable axial suction force. This axial suction force can be transmitted to the filter guide structure 5 at the bottom of the sampling tube 2 through the guide cylinder 6 and the guide and rectify structure 4, thereby actively "grabbing" the external water sample.

[0025] This invention integrates four functional modules—filtration and flow guidance, rectification and stabilization, active suction, and flow control—into a compact sampling head. The impeller 7 is not merely a conveying component but serves as a built-in active power source. When the impeller 7 rotates within the guide tube 6, it generates stable axial suction. This suction is transmitted to the filtration and flow guidance structure 5 via the flow guidance and rectification structure 4, transforming "passive suction" into "active grasping," thus enhancing sampling efficiency in deep water. Simultaneously, the water flow sequentially undergoes preliminary filtration and guidance through the filtration and flow guidance structure 5, rectification through the flow guidance and rectification structure 4, stable suction and pressurization by the impeller 7, and finally precise control through the throttle valve 8. This path shapes and rectifies the active flow field of the water entering the pipe, transforming irregular turbulent pulsations into directional, uniform axial flow, offering advantages such as stable flow direction, weak lateral mixing, and fewer air bubbles.

[0026] Specifically, when the present invention performs sampling, the built-in impeller 7 acts as an active power source and starts simultaneously with the external suction component to work in coordination; wherein, the rotational speed of the impeller is set between 200 and 500 rpm.

[0027] In deep-water sampling, the efficiency degradation of traditional passive sampling is mainly due to the fact that the head of the external pump needs to be used to overcome two resistances: (1) the static pressure of the water column (proportional to the depth); and (2) the frictional resistance along the entire suction pipeline.

[0028] Assuming sampling depth: The external pump model is fixed (HQ curve is known), and the impeller speed of this invention is 300 rpm.

[0029] In traditional passive sampling, the effective head of the pump is entirely used to overcome... and pipeline resistance.

[0030] Total head required by the system ,in The hydrostatic head is 10 meters. The pipeline friction loss (assumed to be 2 meters) is... rice; On the pump's characteristic curve, the flow rate corresponding to a head of 12 meters is... This refers to the sampling flow rate under the traditional passive adoption method.

[0031] In this invention, the impeller 7 rotates and does work on the water flow, which will create a certain induced suction (negative pressure) at its inlet (at the filter guide structure) and a certain boosting pressure at its outlet (upper part of the guide tube 6), which is equivalent to reducing the net lift head acting on the external pump.

[0032] Assuming the impeller 7 generates an equivalent induced head of 300 rpm, Based on a simplified model of an axial-flow induced draft pump, this value ranges from approximately 0.5 to 2 meters for small-sized, low-speed impellers.

[0033] At this point, the net head that the external pump needs to overcome becomes: .

[0034] Pick If the median is 1.25 meters, then rice; The flow rate corresponding to a head of 10.75 meters on the pump's characteristic curve. Will be significantly higher than .

[0035] Efficiency improvement calculation: Assume the pump's maximum flow rate at 0 meters head is The slope of the curve is Then we have:

[0036]

[0037] Traffic increase percentage

[0038] For a typical micro centrifugal pump, this improvement can reach 15%-40%; that is, within the same sampling time, the present invention can collect 15%-40% more representative water samples, or save a corresponding proportion of time when reaching the same sampling volume.

[0039] More importantly, when the water is deep As the flow rate increases further, approaching the shut-off head of the external pump, the flow rate may approach zero in conventional methods. However, thanks to the induced effect of the impeller 7, the present invention can still maintain a basic effective flow rate, which achieves a breakthrough from "unable to sample effectively" to "able to sample" at extreme depths.

[0040] According to the definition of the Reynolds number, it is the ratio of inertial force to viscous force, and is used to predict flow state:

[0041] in, Indicates the density of the fluid; Indicates the flow rate of the fluid; For characteristic length (such as pipe diameter) This refers to the dynamic viscosity of the fluid. Generally, the Reynolds number... When the Reynolds number is less than 2000, the fluid is in a laminar flow state; Between 2000 and 4000, the fluid exhibits a transitional flow state; Reynolds number When the value is greater than 4000, the fluid is in a turbulent state.

[0042] exist , , Without changing the basic structure, this invention adds a rotatable impeller 7, which will increase the fluid velocity. Increase, making the Reynolds number The value may increase into the turbulent range.

[0043] Despite overall The values ​​are within the turbulent range, but through the unique structural design of this invention, the fluid can achieve "controlled turbulence" or "highly ordered axial flow," i.e., "quasi-laminar flow." The key lies in: (1) In this invention, before the water flows into the guide tube 6, the large-scale, irregular vortex is cut and broken into multiple small-scale, directionally regular (mainly along the axial direction) streams by the rectification effect of the guide rectification structure 4. This is equivalent to pre-processing the turbulence, which greatly weakens the lateral velocity component and pulsation.

[0044] (2) The rotating impeller 7 not only provides suction, but the flow channels between its blades also provide strong axial constraint and guidance for the water flow. By continuously applying a consistent axial force to the water body, it can continuously suppress the lateral disturbance that may be generated again due to inertia, so that the fluid has a strong mainstream directionality.

[0045] (3) The smooth inner wall of the guide tube 6 restricts the radial development of the fluid, forcing the fluid to maintain an axisymmetric tubular structure.

[0046] Through the coordinated operation of the above-mentioned flow guiding and rectifying structure 4, impeller 7 and guide tube 6, although the fluid micro-particles may still pulsate, their average streamlines are highly parallel, and the lateral (radial) momentum exchange is suppressed to a very low level. Macroscopically, it exhibits stable, stratified flow characteristics similar to laminar flow, hence the name "quasi-laminar flow".

[0047] The resulting "quasi-laminar flow" offers the following advantages for subsequent detection: I. Improve the accuracy and stability of optical detection (such as turbidity and suspended matter). Turbidimeters and suspended solids (SS) optical sensors rely on the principle of light scattering, and their measurement errors mainly originate from: (1) Signal pulsation: The instantaneous uneven spatial distribution of particles in turbulence causes the intensity of scattered light to fluctuate violently.

[0048] (2) Bubble interference: Bubbles carried by turbulence will generate extremely strong abnormal scattering signals.

[0049] In quasi-laminar flow, particulate matter is uniformly and stably distributed, and the scattered light signal fluctuates very little. This reduces the fluctuation range of online turbidimeter readings from ±10% FS (full scale) in turbulent conditions to within ±2% FS. At the same time, bubbles are effectively separated or dissolved, reducing noise spikes and significantly improving the reliability of measurement results.

[0050] II. Maintain the original characteristics of particulate matter and improve sample representativeness Strong turbulent shear forces can break up flexible flocs (such as activated sludge flocs and flocs formed by chemical coagulation), while the gentle "quasi-laminar flow" formed by this invention has low shear force and can well maintain the original size and morphology of suspended particles and flocs in the water sample. This is crucial for evaluating flocculation effect, sludge properties, and measuring some parameters related to particle size distribution.

[0051] Third, it facilitates subsequent flow injection analysis (FIA) or online analyzers. Many online analyzers require a stable, puls-free sample flow, and the quasi-laminar flow of this invention provides favorable conditions for subsequent detection: (1) If online injection of reagents is required for mixing, quasi-laminar flow is more conducive to achieving stable diffusion mixing than uncontrollable turbulent mixing.

[0052] (2) All fluid micro-particles have similar paths and narrow residence time distribution in the reaction tube, which improves the consistency of the reaction and the repeatability of the measurement.

[0053] (3) Smooth flow reduces scouring and irregular adhesion to the optical window or electrode surface.

[0054] The dual-power synergistic design of this invention not only improves the deep-water sampling efficiency through the induced quantization of the impeller 7, but also creates a unique "quasi-laminar flow" under high Reynolds number conditions through the synergy of the flow guiding and rectifying structure 4, the impeller 7, and the guide tube 6. This fundamental improvement in flow field quality is the key to improving the accuracy, stability, and representativeness of data from various subsequent line detection instruments.

[0055] The scheme is further optimized. The main structure 1 includes a base 101, a mounting bracket 102 is fixedly connected to the base 101, and a height adjustment component is provided on the mounting bracket 102. The moving end of the height adjustment component is connected to the sampling tube 2.

[0056] In this embodiment, the base 101 is fixedly connected to the external structure by high-strength bolts to fix the entire sampling device; the height adjustment component is used to drive the entire sampling tube 2 to move vertically, so that the sampling tube 2 can collect water samples at different depths.

[0057] Specifically, the height adjustment assembly includes a motor fixed to the top of the mounting bracket 102. The output shaft of the motor is poweredly connected to a vertically arranged lead screw 103. The lead screw 103 is rotatably connected to a shaft plate 104 fixed on the mounting bracket 102. A slider 105 is threaded onto the lead screw 103. A guide rod 106 slides through the slider 105. The guide rod 106 is arranged side by side on one side of the lead screw 103 and is fixedly connected to the mounting bracket 102 and the shaft plate 104. A fixing ring is fixed to one side of the slider 105 and is fixedly fitted onto the top outer wall of the sampling tube 2. By driving the lead screw 103 to rotate through the motor, and under the guidance of the guide rod 106, the slider 105 can only move vertically up and down along the axis of the lead screw 103. Thus, the height of the sampling tube 2 can be adjusted through the fixing ring.

[0058] It should be noted that the suction assembly includes at least a pump and a delivery pipe connected to the pump. The pipe connected to the outlet pipe 3 needs to be a flexible hose with a certain margin to allow the sampling tube 2 to move vertically.

[0059] In a further optimized design, the impeller 7 is fixedly mounted on a vertically arranged drive shaft 10. The bottom of the drive shaft 10 extends downward and is rotatably connected to the connecting ring structure 11, which is connected to the through opening. The bottom surface of the connecting ring structure 11 is connected to a closed mounting chamber 12, and a rotary drive component 13 is provided in the mounting chamber 12. The output shaft of the rotary drive component 13 is poweredly connected to the drive shaft 10.

[0060] In this embodiment, the connecting ring structure 11 is used to install the power source of the impeller 7 on the one hand, and its own multiple large through holes allow water samples from the outside to enter the sampling tube 2 on the other hand; the output shaft of the rotary drive component 13 is rotatably and sealed to the top wall of the installation chamber 12 through a rotary seal.

[0061] Specifically, the connecting ring structure 11 includes a ring body 111 fixedly connected to the inner wall of the through-hole. Multiple connecting spokes 112 are fixedly fixed circumferentially along the inner wall of the ring body 111. The ends of the multiple connecting spokes 112 are connected to a connecting block 113. The mounting chamber 12 is fixedly connected to the bottom surface of the connecting block 113. The ring body 111 and the connecting block 113 are connected as a whole by the multiple connecting spokes 112, and this whole is fixed to the sampling tube 2. This provides a stable foundation for the installation and operation of the motor and also allows water flow through the large through-hole area between adjacent connecting spokes 112.

[0062] By installing the rotary drive component 13 within the mounting chamber 12, a closed working space is provided, ensuring it remains isolated from external sewage. Simultaneously, the motor generates heat during operation, which is dissipated through heat exchange with the external sewage, serving as a cooling medium. Furthermore, multiple heat dissipation fins 14 are fixedly connected to the outer wall of the mounting chamber 12. These fins further enhance heat dissipation.

[0063] In a further optimized design, the throttle valve 8 is set as a miniature electric butterfly valve, and the rotary drive component 13 is set as a waterproof motor. The miniature electric butterfly valve and the waterproof motor are electrically connected to the controller. The controller can be installed on the top of the sampling tube, and the miniature electric butterfly valve and the waterproof motor can be automatically controlled through the controller.

[0064] It should be noted that the control cables for both the miniature electric butterfly valve and the waterproof motor are waterproof cables, and are led out of the installation compartment and sampling tube wall through a dedicated waterproof sealing joint or through-hole connector, and finally connected to the controller; the waterproof sealing joint ensures long-term sealing reliability at each crossing point. Optionally, the control cable can be laid along the outer wall of sampling tube 2 or a pre-set cable tray, with appropriate slack to accommodate the lifting and lowering movement of sampling tube 2.

[0065] To further optimize the design, the sidewall of the guide tube 6 is provided with multiple pressure relief holes 601 at intervals along the circumference, and all the pressure relief holes 601 are located above the impeller 7.

[0066] In this embodiment, a plurality of pressure relief holes 601 are evenly arranged along the side wall of the guide tube 6, preferably 6 in number and 3 mm in diameter. The axis of the pressure relief holes 601 is inclined from the inside to the outside toward the throttle valve 8, and the inclination angle is preferably 10°. Each pressure relief hole 601 has a flared mouth at its inner end, and the inner large end of the flared mouth is covered and fixed with an anti-clogging filter screen 15. The filter screen is preferably an annular stainless steel woven filter screen with a mesh count of 10-20.

[0067] When abnormally high pressure is generated during the operation of impeller 7 (e.g., impeller 7 suddenly starts, stops, or reverses), the pressure can be effectively released through the pressure relief hole 601. By setting the diameter of pressure relief hole 601 to 3mm, it can both release pressure waves and prevent large particles or fibers from entering and causing blockage. At the same time, during normal operation, the pressure difference inside and outside pressure relief hole 601 is very small, and the trace flow caused by the 3mm hole diameter is negligible, with little interference to the mainstream stable laminar flow. By setting a flared end on the inner side of pressure relief hole 601, flow resistance can be reduced, making pressure relief smoother. By setting the axis of pressure relief hole 601 at an angle, combined with the flared end, the released fluid can be guided more effectively.

[0068] Further optimizing the scheme, the flow guiding and rectifying structure 4 includes a second flow guide shroud 41, the small end of which is fixedly connected to the outer edge of the top surface of the through-hole, and the large end of which is fixedly connected to the rectifying grid 42. The flow guide cylinder 6 is fixedly connected to the rectifying grid 42. The filter flow guiding structure 5 includes a third flow guide shroud 51, the small end of which is fixedly connected to the outer edge of the bottom surface of the through-hole, and the large end of which extends downward and is detachably connected to a filter shroud 52.

[0069] In this embodiment, the filter cover 52 is detachably connected to the bottom of the third guide cover 51 by a threaded connection. The rectifier grid 42 has a mesh structure. During sampling, the water sample is filtered by the filter cover 52 and then enters the third guide cover 51. After that, it enters the third guide cover 51 through multiple large through holes on the connecting ring structure 11. Under the action of the third guide cover 51, it enters the rectifier grid 42 for rectification. The rectified water sample then enters the guide tube 6.

[0070] Further optimization of the scheme also includes a cleaning structure 16, which includes a liquid distribution plate 161 fixed inside the sampling tube 2. The liquid distribution plate 161 is located above the liquid outlet tube 3, and its top is fixed with an inlet pipe 162 for connection with the rinsing assembly. Multiple nozzles 163 are spaced apart on the side wall and bottom surface.

[0071] In this embodiment, the nozzle 163 is configured as an anti-clogging nozzle, and the rinsing assembly includes at least a pump, a pipe, and a container for holding the cleaning fluid. When rinsing the sampling tube 2, the cleaning fluid is pumped to the inlet pipe 162 and the distribution plate 161. After flowing inside the distribution plate 161, the cleaning fluid is sprayed out through the side wall and the bottom surface, which can achieve the effect of cleaning the sampling tube 2.

[0072] The present invention also provides a sampling method based on the wastewater treatment sampling device, the sampling method comprising the following steps: Step 1: Initialization and Depth Localization (1) When the controller is started, the motor drive screw 103 of the height adjustment component rotates, causing the slider 105 and the sampling tube 2 fixed thereto to descend vertically along the guide rod 106.

[0073] (2) According to the preset sampling procedure or manual command, the controller controls the sampling tube 2 to descend to the target water depth. During this process, the throttle valve 8 remains closed and the impeller 7 does not rotate, ensuring that the device does not collect water samples from non-target water layers during the descent.

[0074] Step 2: Initiate sampling and active inhalation (1) After the sampling tube 2 reaches the target depth, the controller first issues an instruction to open the throttle valve 8 to the predetermined opening degree.

[0075] (2) The controller starts the waterproof motor in the installation chamber 12, driving the transmission shaft 10 and the impeller 7 fixed thereon to start rotating.

[0076] (3) The impeller 7 rotates at high speed and generates a stable axial suction force in the guide tube 6. This suction force is transmitted to the through-hole area of ​​the sampling tube 2 through the guide tube 6, the rectifier grid 42 connected to it and the second guide shroud 41.

[0077] (4) Under the action of pressure difference, the external sewage passes through the following channels from bottom to top: filter cover 52 (for coarse filtration) → third guide cover 51 → large through hole of connecting ring structure 11 → second guide cover 41 → rectifier grid 42. After the rectifier grid 42 sorts the water flow into a stable axial laminar flow, it is sent into the guide cylinder 6.

[0078] Step 3: Flow field optimization and pressure co-management (1) The rectified water flow enters the guide tube 6 and is further accelerated and stabilized by the rotating impeller 7, forming a highly efficient directional flow. This dual effect of rectification and active induction ensures that even in still or slow-flowing water bodies, it can actively "capture" water samples within a certain range ahead.

[0079] (2) During the entire sampling process, if a transient abnormal high pressure is generated in the guide tube 6 due to the rapid start-up and shutdown of the impeller 7 or a sudden change in external flow, the high-pressure fluid will be released preferentially through multiple pressure relief holes 601 on the side wall of the guide tube 6. The flared design on the inner side of the pressure relief hole 601 reduces the flow resistance, and its axis is inclined towards the throttle valve 8, which is conducive to guiding the pressure wave. In addition, the anti-clogging filter screen 15 on the inner side prevents internal impurities from clogging the channel.

[0080] Step 4: Sample transport and completion of sampling (1) The water flow lifted by the impeller 7 enters the first guide shroud 9 through the throttle valve 8 at the top of the guide tube 6, then flows into the main body of the sampling tube 2, and finally is transported to the designated sample container by the external suction assembly through the liquid outlet tube 3.

[0081] (2) After the preset sampling time or sampling volume is reached, the controller first stops the waterproof motor and the impeller 7 decelerates smoothly.

[0082] (3) Subsequently, the controller closes the throttle valve 8, cutting off the main water flow channel. One sampling cycle of sampling tube 2 at this depth is completed.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sampling device for wastewater treatment, characterized in that, include: The main structure (1) is provided with a hollow sampling tube (2). The top side wall of the sampling tube (2) is provided with a liquid outlet tube (3) for connecting with the suction assembly. The bottom surface is provided with a through-hole. The upper and lower sides of the through-hole are respectively connected with a corresponding flow guiding and rectifying structure (4) and a filter flow guiding structure (5). The guide tube (6) is connected to the flow guiding and rectifying structure (4). Rotatable impellers (7) are arranged at intervals inside it. The top is connected to the small end of the first guide shroud (9) through the throttle valve (8). The large end of the first guide shroud (9) is connected to the inner wall of the sampling tube (2).

2. The sampling device for wastewater treatment according to claim 1, characterized in that, The impeller (7) is mounted on a vertically arranged drive shaft (10). The bottom of the drive shaft (10) extends downward and is rotatably connected to a connecting ring structure (11). The connecting ring structure (11) is connected in the through-hole. The bottom surface of the connecting ring structure (11) is connected to a closed mounting chamber (12). A rotary drive component (13) is provided in the mounting chamber (12). The output shaft of the rotary drive component (13) is poweredly connected to the drive shaft (10).

3. The wastewater treatment sampling device according to claim 2, characterized in that, The connecting ring structure (11) includes a ring body (111) connected to the inner wall of the through-hole. The inner wall of the ring body (111) is provided with a plurality of connecting spokes (112) spaced apart along the circumference. The ends of the plurality of connecting spokes (112) are connected to the connecting block (113). The mounting chamber (12) is connected to the bottom surface of the connecting block (113).

4. A sampling device for wastewater treatment according to claim 2, characterized in that, Multiple heat dissipation fins (14) are connected to the outer wall of the installation chamber (12).

5. A sampling device for wastewater treatment according to claim 1, characterized in that, The sidewall of the guide tube (6) is provided with a plurality of pressure relief holes (601) spaced apart along the circumference, and the plurality of pressure relief holes (601) are all located above the impeller (7).

6. A sampling device for wastewater treatment according to claim 5, characterized in that, The pressure relief hole (601) is inclined toward the throttle valve (8) and has a flared end on its inner side. The inner side of the flared end is covered with an anti-clogging filter screen (15).

7. A sampling device for wastewater treatment according to claim 1, characterized in that, The flow guiding and rectifying structure (4) includes a second flow guide shroud (41), the small end of which is connected to the outer edge of the top surface of the through-hole, and the large end of which is connected to the rectifying grid (42). The flow guide cylinder (6) is connected to the rectifying grid (42).

8. A sampling device for wastewater treatment according to claim 1, characterized in that, The filter guide structure (5) includes a third guide hood (51), the small end of which is connected to the outer edge of the bottom surface of the through port, and the large end extends downward and is detachably connected to a filter hood (52).

9. A sampling device for wastewater treatment according to claim 1, characterized in that, It also includes a cleaning structure (16), which includes a liquid distribution plate (161) disposed inside the sampling tube (2). The liquid distribution plate (161) is located above the liquid outlet pipe (3), and its top is provided with an inlet pipe (162) for connection with the rinsing assembly. Multiple nozzles (163) are provided at intervals on the side wall and bottom surface.

10. A sampling device for wastewater treatment according to claim 1, characterized in that, The main structure (1) includes a base (101), on which a mounting bracket (102) is connected. A height adjustment component is provided on the mounting bracket (102), and the actuating end of the height adjustment component is connected to the sampling tube (2).

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