An enhanced sampling device for water quality monitoring

Abstract

An enhanced sampling device for water quality monitoring, comprising a sampling pipeline, a filter cover and a sampling head. The sampling pipeline is connected with a sampling pump. The sampling head is provided with a water inlet and a water outlet. The water outlet is connected to the end of the sampling pipeline, and the water inlet is provided with a filter screen. A backwash port is arranged on the front opening of the sampling head, and the size and shape of the backwash port are the same as those of the water inlet. One-way valves are arranged inside the water inlet and inside the backwash port. A rotating shaft is arranged at the central axis inside the sampling head, the front end thereof is fixedly connected with the center of the filter net, and the rear end thereof is connected with the output end of a rotating motor. The filter net is buckled at the front opening of the sampling head. The filter cover is sleeved outside the sampling head, and a diversion channel is concavely arranged on the filter cover. The side wall of the diversion channel is composed of strip-shaped objects arranged at intervals along the water flow direction, and sampling gaps are arranged between the strip-shaped objects. The present invention can effectively improve the water quality sampling efficiency during the water quality monitoring process, reduce the probability of blockage, and better ensure the stable operation of the water quality monitoring.

Description

Technical Field

[0001] The present invention relates to an environmental monitoring technology, and in particular to an enhanced sampling device for water quality monitoring. Background Art

[0002] The monitoring of water quality conditions is an important part of the overall environmental protection situation. Conventional monitoring equipment for water quality generally samples the water in the water source and then conducts tests. Thus, the water quality status can be known in real time or at specified times. There are many locations where water quality needs to be monitored, such as sewage discharge points in factories, residential communities, etc. Especially in industrial production, where industrial wastewater is discharged, the necessity of environmental protection water quality monitoring is even greater. And environmental protection water quality monitoring equipment generally directly samples the water source in the area to be detected, obtains the water sample to be detected by pumping, and directly transports it to the detection equipment for testing. The sampling pipe of the detection equipment generally has a filter screen at its end to filter out impurities or other substances that may block the pipeline or even affect the detection process in the pumped water sample. However, in some locations with poor water quality conditions, especially in the initially discharged industrial wastewater, there are often not only impurities but also non-rigid impurities such as gel-like foams. During the process of water sample extraction, ordinary filter screen head devices cannot play a good role in filtering and blocking. Either a large amount of impurities are easily inhaled, or the filter screen head is easily attached with too many impurities and the entire filter screen head is blocked, making it impossible to sample. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide an enhanced sampling device for water quality monitoring, which can effectively improve the water quality sampling efficiency during the water quality monitoring process and reduce the probability of blockage.

[0004] The technical solution of the present invention is as follows:

[0005] An enhanced sampling device for water quality monitoring, which includes a sampling pipeline, a filter cover, and a sampling head.

[0006] The sampling pipeline is connected to a sampling pump, and one end of the sampling pipeline is connected to the sampling port of the water quality monitoring equipment.

[0007] The sampling head is a tubular structure, provided with a water inlet and a water outlet. The water outlet is connected to the end of the sampling pipeline, and the water inlet is provided with a filter screen; the size of the water inlet of the sampling head is 1 / 3 to 1 / 2 of the area of the front-end opening of the sampling head. The front-end opening of the sampling head is provided with a backwash port, and the size and shape of the backwash port are the same as those of the water inlet; a one-way valve for water inlet towards the inside of the sampling head is arranged inside the water inlet, and a one-way valve for flowing outwards towards the front-end opening is arranged inside the backwash port; a rotating shaft is arranged at the central axis inside the sampling head. The front end of the rotating shaft is fixedly connected to the center of the filter net, and the rear end thereof is connected to the output end of a rotating motor arranged at the rear end of the sampling head; the filter net is buckled at the front-end opening of the sampling head and can rotate;

[0008] The filter cover is sleeved outside the sampling head. At least one diversion channel is recessed on the filter cover and is opened along the water flow direction. The side wall of the diversion channel is composed of strips arranged at intervals along the water flow direction, and sampling gaps are arranged between the strips; the diversion channel extends to a set distance outside the water inlet of the sampling head.

[0009] For the enhanced sampling device for water quality monitoring as described above, wherein a sealed air chamber is provided at the front end of the filter cover. The air chamber is filled with air. The size of the air chamber is related to the buoyancy generated after it sinks into the water body. After the sampling head is put into the water body, the buoyancy generated by the air chamber corresponds to the gravity of the sampling head and the filter cover, and the front-end opening of the sampling head maintains a horizontal orientation state in the water body.

[0010] For the enhanced sampling device for water quality monitoring as described above, wherein the rear end face of the air chamber is an arc-shaped curved surface, and the connection part between the rear end of the diversion channel and the filter cover is an arc-shaped curved surface.

[0011] For the enhanced sampling device for water quality monitoring as described above, wherein a connection part connected to the sampling head is provided at the rear end of the strip of the filter cover. The connection part is connected to the outer shell of the sampling head via a rotating bearing, and the filter cover can rotate around the sampling head.

[0012] For the enhanced sampling device for water quality monitoring as described above, wherein at the rear end position of the air chamber, rotating blades extend outwards with the central axis of the sampling head as the center. Through the action of the rotating blades, when water flows through the rotating blades, the whole filter cover can be driven to rotate around the central axis of the sampling head.

[0013] For the enhanced sampling device for water quality monitoring as described above, the enhanced sampling device for water quality monitoring is characterized in that the rotating blades are movable rotating blades, which are fixed outside the air chamber in a pivoted manner, and are provided with a locking structure for fixing the blade angle after rotating the rotating blades.

[0014] The enhanced sampling device for water quality monitoring as described above, wherein the diversion channel is a spiral channel spirally surrounding the outside of the sampling head.

[0015] The enhanced sampling device for water quality monitoring as described above, wherein a pressure detector is provided inside the sampling head, and the sampling pump, the rotating motor and the pressure detector are signal-connected to a control device. When the pressure detector detects that the internal pressure of the sampling head is less than a first set value, the control device controls the rotating motor to rotate 180 degrees, controls the sampling pump to pump out the liquid in the reverse direction within a first set time, and after the first set time, controls the sampling pump to perform a forward pumping action of the liquid according to a preset sampling requirement.

[0016] The enhanced sampling device for water quality monitoring as described above, wherein the control device is provided with an alarm module, and when the frequency of rotation of the rotating motor recorded by the control device exceeds a second set value, an alarm action is started.

[0017] The enhanced sampling device for water quality monitoring as described above, wherein a backflush discharge elbow is connected to the outside of the filter net outside the backflush port, and the opening of the backflush discharge elbow corresponds to the outer peripheral contour of the backflush port and is arranged opposite to each other, and its end extends to a set distance at the rear end of the sampling head, and is used to guide the sundries falling off after the filter net is backflushed by the backflush port to the rear end of the sampling head.

[0018] As can be seen from the above description, the present invention indeed has the following advantages:

[0019] The enhanced sampling device for water quality monitoring of the present invention is directed to the situation that the water quality state may be poor during the sampling process of water quality monitoring. A sampling head is placed in the water, and through the combined configuration of a filter cover with a preliminary filtering function and a sampling head for further filtering, a sampling device that is more resistant to blockage than the existing conventional technology is obtained. Among them, through the special structure of the filter cover, water can effectively enter through the diversion channel, and the sundries in the water are preliminarily filtered through the sampling gap, so that the sampling head can collect the water sample; in addition, a sampling port and a backflush port are arranged on the side wall of the same chamber on the sampling head. By controlling the rotation of the filter net, the side with adhered sundries is rotated to the backflush port, and the backflush action of the sampling pump is controlled to perform a reverse flushing on the filter net outside the backflush port, so that the sundries on the filter net fall off and are washed away. Thus, a clean half of the filter net can be obtained repeatedly, and by continuously rotating in a cycle, the required liquid sample can be smoothly extracted during sampling, and the situation of being unable to sample or abnormal sampling due to blockage will not occur. Description of the Drawings

[0020] Figure 1 It is a cross-sectional structural schematic diagram of the sampling head in a preferred embodiment of the present invention;

[0021] Figure 2 Schematic cross-sectional structure diagram of the filter cover in a preferred embodiment of the present invention;

[0022] Figure 3 Schematic cross-sectional structure diagram of a preferred embodiment of the present invention.

[0023] Description of main component labels:

[0024] The present invention:

[0025] 1: Sampling head 2: Sampling pipeline 3: Filter net

[0026] 4: Rotating motor 5: Rotating shaft 6: Check valve

[0027] 7: Check valve 8: Water inlet 9: Backwash port

[0028] 10: Filter cover 11: Diversion channel 12: Sampling gap

[0029] 13: Bubble chamber 14: Rotating bearing 15: Rotating blade Detailed implementation manners

[0030] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0031] An enhanced sampling device for water quality monitoring according to the present invention has a cleverly designed sampling structure. Through multiple self-cleaning filter structures, it realizes a more efficient sampling function compared to existing conventional technologies, effectively ensuring that when the sampling equipment extracts water quality samples, it can sample smoothly for a long time without abnormal sampling due to blockage problems, thereby improving the efficiency of environmental monitoring sampling.

[0032] In a preferred embodiment of the enhanced sampling device for water quality monitoring according to the present invention, it includes a sampling pipeline 2, a filter cover 10, and a sampling head 1. The sampling pipeline 2 is connected to a sampling pump, and one end of the sampling pipeline 2 is connected to the sampling port of the water quality monitoring equipment; preferably, the sampling pipeline 2 is a corrosion-resistant and high-temperature-resistant flexible pipe, which can also be used for the extrusion sampling operation of an external pump. The front end of the sampling pipeline 2 is used to connect to the sampling head 1, and the other end is used to connect to the sampling port of the water quality monitoring equipment. Of course, it can also be connected to an intermediate sampling tank, and then provided to one or more water quality monitoring equipment for water quality sampling and detection through the intermediate sampling tank.

[0033] The sampling head 1 is a tubular structure, provided with a water inlet 8 and a water outlet. The water outlet is connected to the end of the sampling pipeline 2, and the water inlet 8 is provided with a filter screen; the size of the water inlet 8 of the sampling head 1 is 1 / 3 to 1 / 2 of the area of the front end opening of the sampling head 1. A backwash port 9 is provided on the front end opening of the sampling head 1, and the size and shape of the backwash port 9 are the same as those of the water inlet 8. In a preferred case, the sampling head 1 has a circular cross-sectional profile, and the water inlet 8 and the backwash port 9 are respectively two symmetric semi-circular profiles, each occupying about half of the area of the front end opening of the sampling head.

[0034] A one-way valve 6 for water to enter the sampling head 1 is provided inside the water inlet 8, and a one-way valve 7 for water to flow outwards from the front end opening is provided inside the backwash port 9; by setting the above one-way valves, when the sampling operation is carried out in different directions, the water flow in the sampling head 1 can only pass through one of the water inlet 8 or the backwash port 9 respectively. When one direction is opened, the other one-way valve will close, so that the water flow in different directions will only flow through the water inlet 8 or the backwash port 9. A rotating shaft 5 is provided at the central axis inside the sampling head 1. The front end of the rotating shaft 5 is fixedly connected to the center of the filter net 3, and the rear end thereof is connected to the output end of a rotating motor 4 provided at the end of the sampling head 1; the filter net 3 is buckled at the front end opening of the sampling head 1 and can rotate; the filter net 3 can rotate at the front end opening of the sampling head 1 driven by the rotating motor 4. Preferably, the rotation angle each time is 180 degrees, that is, the parts of the filter net 3 facing the water inlet 8 and the backwash port 9 respectively are rotated and interchanged, so that after the filter net 3 at the water inlet 8 accumulates sundries, it can be rotated outside the backwash port 9, and the water flow flushed out through the backwash port 9 is used to reverse-flush the filter net 3 to wash away the sundries from the filter net 3.

[0035] The filter cover 10 is sleeved outside the sampling head 1. At least one diversion channel 11 is concavely provided on the filter cover 10 and is opened along the water flow direction. The side wall of the diversion channel 11 is composed of strip-shaped objects arranged at intervals along the water flow direction, and sampling gaps 12 are provided between the strip-shaped objects; the diversion channel 11 extends to a set distance outside the water inlet 8 of the sampling head 1. As shown in the figure, preferably, the diversion channel 11 is a channel provided on the filter cover 10 and is in the same direction as the central axis of the sampling head 1. It can divert the water flow and also separate the sundries in the water. The water body entering the diversion channel 11 can flow out backward through the diversion channel 11, and at the same time, a part of it flows into the water inlet 8 of the sampling head 1 through the sampling gaps 12 between the strip-shaped objects and is thus extracted by the water inlet 8. Of course, in a preferred case, the width of the sampling gaps 12 between the strip-shaped objects can be set according to the actual situation of the water body. When the size of the sundries is large, the sampling gaps 12 can be spaced wider. Due to the action of the water flow in the diversion channel 11, most of the sundries will move along the direction of the diversion channel 11, and only a small part of the water flowing into the sampling head 1 through the sampling gaps 12 on the side is involved. In this way, the side sampling method parallel to the water flow direction can prevent the sundries from adhering to the filter cover 10, effectively avoiding the situation of the filter cover 10 being blocked. Moreover, due to the action of the water flow, the sundries existing at the sampling gaps 12 on the filter cover 10 can be washed away, achieving the effect of automatic cleaning. Of course, the sampling gaps are generally arranged near the front end of the water inlet of the sampling head, and the inner side wall of the diversion channel is a sampling gap structure, and the outer side wall is a solid side wall structure.

[0036] In a preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, as shown in the figure, a sealed bubble chamber 13 is provided at the front end of the filter cover 10. The bubble chamber 13 is filled with air. The size of the bubble chamber 13 is related to the buoyancy generated after it sinks into the water body. After the sampling head 1 is put into the water body, the buoyancy generated by the bubble chamber 13 corresponds to the gravity of the sampling head 1 and the filter cover 10, and the front end opening of the sampling head 1 maintains a horizontal orientation state in the water body. Preferably, the bubble chamber 13 is used to generate a set buoyancy to lift the front end of the sampling head 1. The size of the bubble chamber 13 is set corresponding to the gravity of the entire sampling head 1. The buoyancy generated by the bubble chamber 13, the filter cover 10 as a whole, and the sampling head 1 is related to the gravity of the filter cover 10 and the sampling head 1. After the sampling head 1 sinks into the water, the front end of the sampling head 1 can float due to the action of the bubble chamber 13, and at the same time, the whole sampling head 1 can be in a horizontal suspended posture in the water. In this way, during the sampling process, it is ensured that the sampling of the sampling head 1 is on the same straight line as the water flow direction, avoiding the direct impact of the sundries in the water flow on the sampling head 1 and preventing the sundries from directly hanging on the sampling head 1 or the filter cover 10.

[0037] In the preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, as shown in the figure, the rear end surface of the bubble chamber 13 is an arc surface, and the connection between the rear end of the guide channel 11 and the filter cover 10 is an arc surface. By providing the arc surface, the resistance of the bubble chamber 13 to the water flow can be effectively reduced, and at the same time, the arc surface reduces the debris in the water flow from being hung on the receiving surface of the rear end of the bubble chamber 13.

[0038] As described above, in the preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention, the filter cover 10 is provided with a connection portion connected to the sampling head 1 at the rear end of the strip, and the connection portion is connected to the outer shell of the sampling head 1 via a rotating bearing 14, and the filter cover 10 can rotate around the sampling head 1. As shown in the figure, preferably, the filter cover 10 has a cylindrical structure, and at least one diversion channel 11 is provided inside, and its central axis position is coaxial with the central axis of the sampling head 1. Through the connection of the rotating bearing 14, the filter cover 10 can rotate around the sampling head 1. The filter cover 10 can rotate, so that after the sampling device of the present invention enters the water body, it can fully adapt to the conditions of slow and high-speed water flow, and can maintain a stable suspension state in the water, and will not cause various abnormal conditions such as twisting of the sampling head 1 due to the impact of the water flow on the filter cover 10, so that the sampling position and sampling state of the sampling head 1 are more stable and reliable.

[0039] As described above, in the preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention, the rear end position of the bubble chamber 13 is centered on the central axis of the sampling head 1, and a rotating blade 15 is extended outward. Through the action of the rotating blade 15, when the water flows through the rotating blade 15, the filter cover 10 as a whole can be driven to rotate around the central axis of the sampling head 1. As shown in the figure, a rotating blade 15 is provided at the rear end of the bubble chamber 13, and the inclination angle of the rotating blade 15 can drive the entire filter cover 10 to rotate after the water flow impacts. Whereby, when there is water flow at the front end of the sampling head 1, the entire filter cover 10 can be rotated in different directions according to the direction of the water flow, and the rotation speed is different according to the magnitude of the water flow impact. By driving the filter cover 10 to rotate, the debris in the guide channel 11 can be easily separated from the side wall of the guide channel 11, especially from the sampling gap 12 in the guide channel 11, under the action of the circumferential rotation; further, when the rotation reaches a certain speed, a centrifugal effect is generated, and the debris will move toward one side of the principle sampling head 1, that is, away from the sampling gap 12, which can not only better clean up the debris on the sampling gap 12, but also prevent the sampling gap 12 from being blocked.

[0040] As described above, in the preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention, the rotating blade 15 is a movable rotating blade, which is fixed to the outside of the bubble chamber 13 by a pivoting manner, and is provided with a locking structure for fixing the blade angle after rotating the rotating blade 15. Preferably, the rotating blade 15 has a plurality of blades, and the plurality of blades are pivoted to the outer surface of the bubble chamber 13. By turning, the tilting direction of the rotating blade 15 can be changed, and the rotating blade 15 is fixed at a specified tilting angle by a locking structure. In this way, the tilting direction of the rotating blade 15 can be controlled, and the filter cover 10 as a whole can produce a rotational movement in a specified direction according to the tilting direction of the rotating blade 15 through the impact of the water flow. After an appropriate running time, the rotation direction of the filter cover 10 is adjusted and changed, so that the filter cover 10 can reduce the situation of hanging debris during the sampling process in the water body, which is equivalent to the principle of the washing machine drum shaking back and forth. If the debris is hung on the filter cover 10 in one direction, it will be easy to fall off after rotating in another direction. Therefore, the sampling device of the present invention can better prevent debris from being trapped and avoid clogging of the sampling head 1.

[0041] In the preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, the diversion channel 11 is a spiral channel spirally surrounding the outside of the sampling head 1. Preferably, the diversion channel 11 is a structure spirally surrounding the sampling head 1, and the sampling slit 12 is arranged close to one side of the sampling head 1, so that the side wall impacted by the water flow in the spiral channel is the outer side wall of the diversion channel 11. Such a structure can reduce the contact of debris with the sampling slit 12 and reduce the debris hanging on the sampling slit 12.

[0042] In a preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, a pressure detector is provided inside the sampling head 1. The sampling pump, the rotating motor 4, and the pressure detector are signal-connected to a control device. When the pressure detector detects that the internal pressure of the sampling head 1 is less than the first set value, the control device controls the rotating motor 4 to rotate 180 degrees, and then controls the sampling pump to pump out liquid in the reverse direction outside the flushing port 9 within the first set time. After the first set time, the control device controls the sampling pump to perform a forward pumping action of the liquid according to a preset time. Preferably, in some special water bodies, such as those with a large amount of debris and waste, the filter net 3 outside the water inlet 8 is easily covered and blocked by waste, resulting in the sampling head 1 being unable to effectively extract water samples. The sampling head 1 of the present invention is provided with the pressure detector. By detecting the pressure inside the sampling head 1 and through experimental calibration, when waste blocks the filter net 3 and hinders the sampling of the sampling head 1, the pressure inside the sampling head 1 will decrease. When the pressure decreases to the first set value, it is determined that the filter net 3 at the water inlet 8 is blocked. At this time, the control device starts the rotating motor 4 to rotate the other half of the filter net 3 to the water inlet 8. In this way, the blocked part of the filter net 3 can be directly replaced with a clean part of the filter net 3, and the blockage problem can be solved immediately. At the same time, the part of the filter net with too much retained debris is rotated outside the flushing port 9, and the control device starts the sampling pump to pump out in the reverse direction. Water flows out from the flushing port 9, which can wash out and remove the debris retained on the outside of the filter net 3. After performing a flushing for a set time, the sampling pump is controlled to pump water forward again, and the water inlet 8 of the sampling head 1 can continue to sample normally.

[0043] In a preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, the control device is provided with an alarm module. When the frequency of rotation of the rotating motor 4 recorded by the control device exceeds the second set value, an alarm action is started. Preferably, the present invention is provided with an alarm module, which can continuously judge by the control device the frequency of rotation of the rotating motor 4 to control the filter net 3 whether there is an over-blockage situation in the blockage condition of the filter net 3, or whether there is an abnormal excess of debris in the water flow. Through the alarm function of the alarm module, it is possible to effectively and timely notify the staff to check the water body near the sampling point, investigate abnormal sewage discharge situations, or investigate and solve the abnormal situation where the sampling head 1 is completely blocked.

[0044] In a preferred embodiment of the enhanced sampling device for water quality monitoring of the present invention as described above, a backflush discharge elbow is connected to the outer side of the filter net 3 outside the backflush port 9. The opening of the backflush discharge elbow corresponds to the outer peripheral contour of the backflush port 9 and is arranged opposite to it. Its end extends to a set distance in front of the sampling head 1 for guiding the debris shed after the backflush port 9 backflushes the filter net 3 to the rear end of the sampling head 1. Preferably, the backflush discharge elbow is a pipe connecting the backflush port 9. Its opening covers the backflush port 9, and the other end extends outside the front end of the bubble chamber 13, so that the debris and waste flushed out from the backflush port 9 will no longer stay on the filter cover 10.

[0045] For the enhanced sampling device for water quality monitoring of the present invention, in view of the possible situation of poor water quality state during the sampling process of water quality monitoring, a sampling head is placed in the water. Through the combined configuration of a filter cover with a preliminary filtering function and a sampling head with further filtering, a sampling device that is more resistant to blockage than the existing conventional technology is obtained. Among them, through the special structure of the filter cover, water can effectively enter through the diversion channel and the debris in the water is preliminarily filtered through the sampling gap, so that the sampling head can collect the water sample; in addition, a sampling port and a backflush port are arranged on the side wall of the same chamber on the sampling head. By controlling the rotation of the filter net, the side with adhered debris is rotated to the backflush port, and the backflush action of the sampling pump is controlled to reversely flush the filter net outside the backflush port, so that the debris on the filter net falls off and is washed away. Thus, a clean half of the filter net can be obtained cyclically. By continuously rotating cyclically, the required liquid sample can be smoothly extracted during sampling, and the situation of being unable to sample or abnormal sampling due to blockage can be avoided.

[0046] The above description is only a schematic specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An enhanced sampling device for water quality monitoring, characterized in that, It includes a sampling pipeline, a filter cover and a sampling head. The sampling pipeline is connected to a sampling pump, and one end of the sampling pipeline is connected to the sampling port of the water quality monitoring device. The sampling head is a tubular structure, provided with a water inlet and a water outlet. The water outlet is connected to the end of the sampling pipeline. The size of the water inlet of the sampling head is 1 / 3 to 1 / 2 of the area of the front opening of the sampling head. A backwash port is provided on the front opening of the sampling head. The size and shape of the backwash port are the same as those of the water inlet. The water inlet and the backwash port are provided with filter meshes. A one-way valve for water inlet towards the inside of the sampling head is provided inside the water inlet. A one-way valve for flowing outwards towards the front opening is provided inside the backwash port. A rotating shaft is provided at the central axis inside the sampling head. The front end of the rotating shaft is fixedly connected to the center of the filter mesh, and the rear end thereof is connected to the output end of a rotating motor provided at the rear end of the sampling head. The filter mesh is buckled at the front opening of the sampling head and can rotate. Driven by the rotating motor, the filter mesh rotates at the front opening of the sampling head to rotate and interchange the filter mesh parts respectively facing the water inlet and the backwash port. The filter cover is sleeved outside the sampling head. At least one diversion channel is concavely provided on the filter cover and is opened along the water flow direction. The side wall of the diversion channel is composed of strip-shaped objects arranged at intervals along the water flow direction. Sampling gaps are provided between the strip-shaped objects. The diversion channel extends to a set distance outside the water inlet of the sampling head. A sealed air chamber is provided at the front end of the filter cover. The air chamber is filled with air. The size of the air chamber is related to the buoyancy generated after it sinks into the water body. After the sampling head is put into the water body, the buoyancy generated by the air chamber corresponds to the gravity of the sampling head and the filter cover, and the front opening of the sampling head maintains a horizontal orientation state in the water body. The rear end face of the air chamber is an arc-shaped curved surface, and the connection part between the rear end of the diversion channel and the filter cover is an arc-shaped curved surface. A connection part connected to the sampling head is provided at the rear of the strip-shaped object of the filter cover. The connection part is connected to the outer shell of the sampling head via a rotating bearing, and the filter cover can rotate around the sampling head. At the rear end position of the air chamber, rotating blades are provided and extend outwards around the central axis of the sampling head. Through the action of the rotating blades, when water flows through the rotating blades, the whole filter cover can be driven to rotate around the central axis of the sampling head.

2. The enhanced sampling device for water quality monitoring according to claim 1, wherein, The rotating blades are movable rotating blades and are fixed outside the air chamber by a pivoting method. A locking structure is provided for fixing the blade angle after rotating the rotating blades.

3. The enhanced sampling device for water quality monitoring according to claim 2, characterized in that, The diversion channel is a spiral channel spirally surrounding outside the sampling head.

4. The enhanced sampling device for water quality monitoring according to claim 3, characterized in that, A pressure detector is provided inside the sampling head. The sampling pump, the rotating motor, and the pressure detector are signal-connected to a control device. When the pressure detected by the pressure detector inside the sampling head is less than a first set value, the control device controls the rotating motor to rotate 180 degrees, controls the sampling pump to pump out the liquid in the reverse direction within a first set time. After the first set time, the control device controls the sampling pump to perform a forward pumping action of the liquid according to the preset sampling requirements.

5. The enhanced sampling device for water quality monitoring according to claim 4, characterized in that, The control device is provided with an alarm module. When the frequency of the rotation of the rotating motor recorded by the control device exceeds a second set value, an alarm action is started.

6. The enhanced sampling device for water quality monitoring according to claim 5, characterized in that, A backflush discharge elbow is connected to the outside of the filter net outside the backflush port. The opening of the backflush discharge elbow corresponds to the outer peripheral contour of the backflush port and is disposed opposite to it. Its end extends to a set distance at the rear end of the sampling head, and is used to guide the debris falling off after the backflush port backflushes the filter net to the rear end of the sampling head.

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