A device for detecting total phosphorus and total nitrogen CODmn in water

Abstract

The present invention discloses a device for detecting total phosphorus and total nitrogen (CODmn) in water, and relates to the technical field of water quality detection. The device comprises a base, a detector is arranged in the base, a chamber is provided in the base, a water receiving hole is provided on the top of the base, a connecting pipe is arranged in the chamber, a detection head is arranged in a solution bottle, an electric core wire is wound around the outside of the connecting pipe, a detection mechanism is arranged in the water receiving hole, a closing mechanism is arranged in the connecting pipe, the electric core wire is located above the closing mechanism, and the detection mechanism is electrically connected to the electric core wire. The detection mechanism can detect impurities in the water sample. When the impurities in the water sample exceed the threshold value, the passage of the connecting pipe can be closed by the closing mechanism, and a large current is passed through the electric core wire to realize heating and digestion of the water sample. The present invention can selectively enable the closing mechanism according to different water samples, and realize the switching between the two modes of the connecting pipe only adsorbing impurities and synchronous heating by controlling the current passed through the electric core wire.

Description

Technical Field

[0001] The invention relates to the technical field of water quality detection, in particular to a device for detecting total phosphorus and total nitrogen (CODmn) in water. Background Art

[0002] As we all know, water body testing instruments are professional instruments used to analyze the content of water quality components. They mainly refer to instruments for measuring BOD, COD, ammonia nitrogen, total phosphorus, total nitrogen, turbidity, PH, dissolved oxygen and other items in water. In order to protect the water environment, it is necessary to strengthen the detection of sewage discharge. Water body testing instruments play an important role in environmental protection, water quality detection and water resource protection.

[0003] At present, the Chinese patent with the publication number CN113092185A discloses a five-parameter water quality detector for COD, ammonia, nitrogen, total phosphorus, total nitrogen, and turbidity, which includes a base, and the detector is arranged in the base. In addition, the base is provided with a through hole and a chamber from top to bottom, and a magnetic suction pipe connected to the through hole is arranged in the chamber, and the magnetic suction pipe can guide the water sample into the sub-item detection volume tube and complete the detection through the detection head.

[0004] In the above patented technology, a filter tube assembly is provided in the through hole, and an electric core wire is wound around the outside of the magnetic suction tube. The large particles of impurities in the water sample are filtered through the filter tube assembly, and the energized electric core wire can exert magnetic force to adsorb iron impurities on the inner wall of the tube. Although this solution focuses on solving the problem of preliminary filtering of impurities in water samples, when the impurity content in some water samples exceeds the standard, it is usually necessary to digest the water samples. However, the above solution does not have the function of digesting water samples, resulting in inaccurate water sample detection. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device for detecting total phosphorus and total nitrogen (CODmn) in water.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A device for detecting total phosphorus and total nitrogen (CODmn) in water comprises a base, a detector is arranged in the base, a chamber is also provided in the base, a water receiving hole connected to the chamber is provided on the top of the base, a connecting pipe engaged with the water receiving hole is provided in the chamber, the connecting pipe is adapted to be able to introduce a water sample into a solution bottle, a detection head electrically connected to the detector is provided in the solution bottle, an electric core wire is wound around the outside of the connecting pipe, a detection mechanism is arranged in the water receiving hole, the detection mechanism is adapted to be able to detect whether impurities in the water sample passing through the water receiving hole exceed a threshold value, a closing mechanism is provided in the connecting pipe, the closing mechanism is adapted to be able to close the passage of the connecting pipe, the electric core wire is located above the closing mechanism, and the detection mechanism is electrically connected to the electric core wire.

[0008] Preferably, a liquid pumping mechanism is provided on the top side wall of the connecting tube, and the liquid pumping mechanism is adapted to be able to pump the digester into the connecting tube.

[0009] Preferably, the detection mechanism includes a TOC analyzer, a chromatograph or a spectrometer, the closing mechanism includes a solenoid valve, and the closing mechanism is electrically connected to the detection mechanism.

[0010] Preferably, two closing mechanisms are provided along the axial direction of the connecting tube, and the electric core wire is located between the two closing mechanisms.

[0011] Preferably, a filter screen is provided in the water receiving hole.

[0012] Preferably, the detection mechanism includes a detection net arranged on the top of the filter net, an elastic part is connected to the detection net, and a contact switch is also arranged in the water receiving hole, and the contact switch is electrically connected to the battery core wire; when the flow rate of the detection net is reduced and it is pressurized and bounced, the detection net can press the contact switch.

[0013] Preferably, the water filtering area on the detection net and the water filtering area on the filter net are staggered, a pipe is provided between the top of the water receiving hole and the top of the connecting pipe, a closing plate is provided on the top of the detection net, and a water flow groove is provided on the closing plate; when the detection net is fitted with the filter net, the water flow groove is aligned with the pipe; a locking piece is also provided in the water receiving hole, and the locking piece is adapted to maintain the fitting state of the detection net and the filter net.

[0014] Preferably, the closing mechanism includes a closing disk and a driving shaft rotatably arranged on the closing disk, the closing disk is provided with a water through hole, a water blocking plate capable of sealing the water through hole is rotatably arranged in the water through hole, a first gear is arranged on the rotating shaft of the water blocking plate, a second gear is arranged on the driving shaft, and the second gear is meshed with the first gear.

[0015] Preferably, the driving shaft passes through the detection net upward, and a spiral driving groove is provided on the outer wall of the top end of the driving shaft, and a driving block extending into the spiral driving groove is provided on the inner hole wall of the detection net.

[0016] Preferably, a connecting sleeve is also rotatably provided on the driving shaft, and a magnetic ring is provided on the connecting sleeve. The electric core wire cooperates with the connecting tube to generate a magnetic field and drive the magnetic ring to rotate, and a stirring net is provided on the side wall of the connecting sleeve; a locking ring groove is provided on the detection net, and the locking member includes a locking shaft slidably provided on the side wall of the driving shaft; when the detection net is in contact with the filter net, the locking shaft is inserted into the locking ring groove; an oil storage cavity is provided in the driving shaft, and the oil storage cavity is connected to the sliding hole of the locking shaft, and a connecting hole connected to the oil storage cavity is provided on the side wall of the driving shaft, and the connecting hole is opposite to the connecting sleeve, and a detection shaft is also slidably provided on the connecting sleeve, and the sliding hole of the detection shaft is connected to the inner cavity of the connecting sleeve; the detection shaft can slide to a protruding position under the action of centrifugal force, and at this time, the locking shaft slides to a retracted position under the suction force of the oil pressure to escape from the locking ring groove.

[0017] The beneficial effects of the present invention are:

[0018] 1. The detection mechanism can detect impurities in the water sample. When the impurities in the water sample do not exceed the threshold value, a small current is passed through the electric core wire during the process of the water sample passing through the connecting tube to achieve adsorption of impurities in the water sample; and when the impurities in the water sample exceed the threshold value, the passage of the connecting tube can be closed by the closing mechanism, and a large current is passed through the electric core wire to achieve heating and digestion of the water sample. Compared with the prior art, the present invention can selectively enable the closing mechanism according to different water samples, and realize the switching of the connecting tube between the two modes of only adsorbing impurities and synchronous heating by controlling the current passed through the electric core wire. The present invention can achieve the digestion of water samples, making the water sample detection more accurate.

[0019] 2. The organic impurities in the water sample can be detected by TOC analyzer, chromatograph or spectrometer, and the opening and closing of the solenoid valve and the current of the battery line can be controlled according to the detection results, thereby switching the use mode of the connecting pipe electronically.

[0020] 3. The detection net is used to detect suspended impurities in the water sample, and the connection pipe usage mode is switched by pressing the contact switch. In addition, when the impurities exceed the threshold and the detection net is pressed down, the detection net and the filter net can cooperate to close the passage of the water receiving hole, and the water tank is connected to the pipeline, so that the water sample does not flow through the filter net, but is directly introduced into the connection pipe for heating and digestion. The service life of the filter net is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment;

[0022] Figure 2 for Figure 1 A magnified view of part A;

[0023] Figure 3 for Figure 1 A magnified view of part B;

[0024] Figure 4 for Figure 2 Enlarged view of part C;

[0025] Figure 5 for Figure 1 Enlarged view of part D.

[0026] 1. Base; 2. Detector; 3. Chamber; 4. Water receiving hole; 5. Connecting pipe; 6. Battery wire; 7. Detection mechanism; 8. Closing mechanism; 9. Pumping mechanism; 10. Filter net; 11. Detection net; 12. Elastic member; 13. Contact switch; 14. Pipeline; 15. Closing plate; 16. Water trough; 17. Locking member; 18. Closing disk; 19. Drive shaft; 20. Water hole; 21. Water blocking plate; 22. First gear; 23. Second gear; 24. Spiral drive groove; 25. Drive block; 26. Connecting sleeve; 27. Magnetic ring; 28. Stirring net; 29. ​​Locking ring groove; 30. Locking shaft; 31. Oil storage chamber; 32. Connecting hole; 33. Detection shaft; 34. Display screen; 35. Guide part; 36. Diversion part; 37. Drip head; 38. Solution bottle; 39. Detection head. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 5 As shown, a device for detecting total phosphorus and total nitrogen in water, CODmn, comprises a base 1, which is a box structure with a chamber 3 inside, and a detector 2 is arranged on the top of the base 1, for example, a display screen 34 electrically connected to the detector 2 may also be arranged on the top surface or the outer surface. In addition, a water receiving hole 4 connected to the chamber 3 is opened on the top of the base 1, and a connecting pipe 5 connected to the water receiving hole 4 is arranged in the chamber 3.

[0029] The connecting pipe 5 may specifically include a guide portion 35 located at the top and connected to the water receiving hole 4, and a diverter portion 36 located at the bottom and provided with a drip head 37. For example, the diverter portion 36 may be arranged to extend in the lateral direction, and a plurality of drip heads 37 may be provided on the diverter portion 36, and a solution bottle 38 is provided on the bottom surface of the chamber 3 corresponding to each drip head 37. The plurality of detection heads 39 on the detector 2 are placed in the solution bottle 38 one by one.

[0030] When testing water samples, the water samples can be poured into the water receiving hole 4, and the connecting pipe 5 can respectively guide the water samples into different solution bottles 38 for testing. For example, different probes can respectively detect the CODmn value, ammonia nitrogen data, total phosphorus data, total nitrogen data and turbidity data of the water samples, thereby realizing automatic multi-parameter testing of the water samples. The test results will be displayed on the display screen 34 for the test personnel to view conveniently.

[0031] Similar to the prior art, a filter screen 10 is provided in the water receiving hole 4, and an electric core wire 6 is wound around the outer wall of the flow guide 35. When the water sample passes through the water receiving hole 4, it can be filtered for the first time through the filter screen 10; when the water sample flows through the flow guide 35, the electric core wire 6 and the connecting tube 5 cooperate to generate a magnetic field, so that the iron impurities in the water sample can be adsorbed on the inner wall of the flow guide 35, and the water sample can be filtered for the second time.

[0032] The difference is that a detection mechanism 7 is further provided in the water receiving hole 4 of the present invention, and a closing mechanism 8 is provided in the guide portion 35. Among them, the detection mechanism 7 is adapted to be able to detect whether the impurities in the water sample passing through the water receiving hole 4 exceed the threshold value, and the closing mechanism 8 is adapted to be able to choose whether to close the passage of the connecting pipe 5 according to the detection result of the detection mechanism 7. In more detail, in the vertical direction, the battery core wire 6 is wound above the closing mechanism 8, and the detection mechanism 7 is also electrically connected to the battery core wire 6. The electrical connection mentioned in the present invention can be achieved, for example, by cable or wireless means, which is a common electrical technology in the prior art, so it will not be repeated.

[0033] For example, when the detection mechanism 7 detects that the impurities in the water sample exceed the threshold value, that is, the water sample still cannot reach the standard to be detected after passing through the filter 10 and magnetic adsorption, the closing mechanism 8 can close the passage of the connecting tube 5, and the water sample flowing into the connecting tube 5 will be kept in the guide part 35. At this time, the electric core wire 6 can be controlled to pass a large current to achieve heating and digestion of the water sample.

[0034] It can be understood that, by controlling the current flowing into the core wire 6, the connecting tube 5 has at least:

[0035] 1. Impurity adsorption only mode with a small current;

[0036] 2. Synchronous heating mode with high current.

[0037] In the synchronous heating mode, the closing mechanism 8 closes the passage of the connecting tube 5, and the water sample will be kept in the guide part 35 for sufficient heating and digestion until the impurities are digested and the water sample reaches the standard to be tested. For example, a pumping mechanism 9 can also be set on the top side wall of the connecting tube 5, and the digestion agent can be pumped into the guide part 35 through the pumping mechanism 9, and the digestion effect and efficiency of the water sample can be improved by the digestion agent. The pumping mechanism 9 can be composed of a common water bag or a water pump, as long as it can complete the pumping of the digestion agent, and is not limited in the present invention.

[0038] In a preferred example, two closing mechanisms 8 can be provided along the axial direction of the guide portion 35, and the electric core wire 6 is vertically wound between the two closing mechanisms 8. In the synchronous heating mode, the two closing mechanisms 8 cooperate to form a relatively closed heating space therebetween, so that the heating and digestion effect of the water sample is better.

[0039] In some embodiments, the detection mechanism 7 may include a water quality analysis instrument such as a TOC analyzer, a chromatograph or a spectrometer (not shown), and the organic impurity content in the water sample may be preliminarily measured by the detection mechanism 7, and then the operation of the closing mechanism 8 may be controlled according to the measurement structure. The closing mechanism 8 may include a solenoid valve (not shown), and the solenoid valve is electrically connected to the detection mechanism 7, and the passage of the connecting pipe 5 may be conveniently and electrically controlled to be closed by the solenoid valve.

[0040] As another solution, the detection mechanism 7 may include a detection net 11 arranged on the top of the filter net 10, and an elastic member 12 is connected to the detection net 11. Under the elastic force of the elastic member 12, the detection net 11 may bounce in the vertical direction. In particular, when the suspended impurities in the water sample exceed the threshold value, the suspended impurities are blocked above the detection net 11, and the flow rate of the detection net 11 is reduced until it is pressed down under the action of water pressure. Based on this, a contact switch 13 is also provided in the water receiving hole 4. When the detection net 11 is pressed down, the contact switch 13 can be pressed. The contact switch 13 will transmit an electrical signal to the electric core wire 6 electrically connected thereto, for example, it can be transmitted to a controller (not shown) connected between the two, and the current passing into the electric core wire 6 is increased through the controller.

[0041] The closing mechanism 8 may include a closing disk 18 and a driving shaft 19 rotatably disposed on the closing disk 18. In detail, a water hole 20 is provided on the closing disk 18, and a water blocking plate 21 capable of sealing the water hole 20 is rotatably disposed in the water hole 20. In more detail, a first gear 22 is disposed on the rotating shaft of the water blocking plate 21, and a second gear 23 meshing with the first gear 22 is correspondingly disposed on the driving shaft 19.

[0042] When the drive shaft 19 rotates, the second gear 23 cooperates with the first gear 22 to drive the water blocking plate 21 to rotate synchronously, so that the water blocking plate 21 can rotate to open or close the water hole 20, that is, the closing mechanism 8 can close or open the passage of the connecting pipe 5.

[0043] In some examples, the drive shaft 19 can be driven to rotate by a drive source such as a motor (not shown); in other embodiments, the drive shaft 19 can be configured to penetrate upward through the detection net 11, and a spiral drive groove 24 is provided on the top outer wall of the drive shaft 19, and a drive block 25 extending into the spiral drive groove 24 is provided on the inner hole wall of the detection net 11.

[0044] When the suspended impurities in the water sample exceed the threshold and the detection net 11 is pressed down, the drive block 25 is pressed down synchronously, thereby cooperating with the spiral drive groove 24 to drive the drive shaft 19 to rotate. At this time, the water blocking plate 21 rotates to close the water hole 20, thereby maintaining the water sample in the guide part 35; when the detection net 11 is re-elevated, the spiral drive groove 24 cooperates with the drive block 25 to drive the drive shaft 19 to reverse. At this time, the water blocking plate 21 rotates to open the water hole 20.

[0045] In a preferred example, the water filtering area on the detection net 11 and the water filtering area on the filter net 10 can be arranged alternately. That is, when the detection net 11 and the filter net 10 are not attached, the water sample can be filtered through the water filtering areas on the detection net 11 and the filter net 10 in sequence; and when the detection net 11 is pressed down and attached to the filter net 10, the water filtering areas on both are closed by the other, so that the water sample will not be able to pass through the water receiving hole 4.

[0046] More specifically, a pipe 14 is provided between the top of the water receiving hole 4 and the top of the guide part 35, and a closing plate 15 is provided on the top of the detection net 11, and a water flow groove 16 is provided on the closing plate 15. When the detection net 11 is not pressurized (i.e., when the impurities in the water sample do not exceed the threshold), the water sample normally flows from the water receiving hole 4 into the connecting pipe 5 until it is introduced into the solution bottle 38 for testing, during which the closing plate 15 covers the pipe 14 so that the water sample normally flows through the water receiving hole 4; when the detection net 11 is pressed down, the detection net 11 fits with the filter net 10 to close the passage of the water receiving hole 4, and the water flow groove 16 will be aligned with the pipe 14, so that the water sample can be directly introduced into the guide part 35 through the pipe 14 for heating and digestion.

[0047] It can be understood that when the water sample does not need to be digested, the water sample can be pre-treated only by adsorption and filtration, and a relatively accurate test result can be obtained; when the water sample needs to be digested, the water sample can cooperate with the impurities to directly enter the guide part 35 through the pipe 14 without passing through the filter 10 for heating and digestion, thereby improving the service life of the filter 10.

[0048] In order to maintain the passage state of the pipe 14, a locking member 17 is further provided in the water receiving hole 4, and the relative position of the detection net 11 can be locked by the locking member 17, especially the fitting state of the detection net 11 and the filter net 10 can be maintained. For example, the locking member 17 can be an electromagnet (not shown), and the locking and releasing of the detection net 11 can be realized by the electromagnet.

[0049] In other examples, the drive shaft 19 is adapted to have an oil storage chamber 31 opened inside, and the oil storage chamber 31 is provided with openings at the top and bottom of the drive shaft 19. The locking member 17 includes a locking shaft 30 slidably adapted in the opening at the top, that is, the opening at the top is constituted as a sliding hole for the locking shaft 30. A locking ring groove 29 is also provided on the inner hole wall of the detection net 11. When the detection net 11 is pressed down, the locking shaft 30 can be inserted into the locking ring groove 29, thereby counteracting the bouncing of the detection net 11 away from the side of the filter net 10, and achieving the detection net 11 and the filter net 10 to maintain fit.

[0050] In addition, the drive shaft 19 is also rotatably provided with a connecting sleeve 26 on the outer wall opposite to the opening at the bottom, a stirring net 28 is provided on the side wall of the connecting sleeve 26, and a magnetic ring 27 is also provided on the connecting sleeve 26. Based on this, the adaptable electric core wire 6 and the connecting tube 5 can cooperate to generate a magnetic field that drives the magnetic ring 27 to rotate. For example, the direction of the current flowing into the electric core wire 6 can be changed by a controller, thereby driving the magnetic ring 27 to rotate; or, the electric core wire 6 can be arranged to generate an induced magnetic field, thereby driving the magnetic ring 27 to rotate. It is a prior art to drive the magnetic ring 27 or the shaft body to rotate by a magnetic field, for example, it can be seen from different types of motors, so it will not be repeated in the present invention.

[0051] The rotating connecting sleeve 26 can stir the water sample in the guide part 35 through the stirring net 28, so that the digestion effect of the water sample is further improved. In more detail, a detection shaft 33 is also slidably arranged on the connecting sleeve 26, and the sliding hole of the detection shaft 33 is connected with the inner cavity of the connecting sleeve 26. Since the opening of the oil storage chamber 31 at the bottom is connected with the connecting sleeve 26, that is, the opening at the bottom constitutes the connecting hole 32 on the side wall of the drive shaft 19, the sliding hole of the locking shaft 30, the oil storage chamber 31, the connecting sleeve 26 and the sliding hole of the detection shaft 33 form a continuous cavity, and hydraulic oil is injected into the cavity, for example, the protruding position of the locking shaft 30 can be maintained in a natural state, while the locking shaft 30 is in a retracted position.

[0052] When the water sample passes into the guide part 35 for heating and digestion, the stirring net 28 will be blocked and the rotation speed of the connecting sleeve 26 will be slowed down due to the excessively high content of suspended matter in the water sample; when the water sample is completely digested, the suspended matter in the water sample is digested, the obstruction of the stirring net 28 is reduced, and the rotation speed of the connecting sleeve 26 increases. At this time, the detection shaft 33 will slide to the protruding position under the action of centrifugal force, and the locking shaft 30 will slide to the retracted position under the suction of the oil pressure, especially it will be disengaged from the locking ring groove 29, and the detection net 11 will be reloaded for the subsequent re-detection of the water sample.

[0053] In a preferred example, the locking ring groove 29 may include several parts distributed along the circumferential direction and not connected to each other. In this case, the rotation tendency of the driving shaft 19 can be limited by the cooperation between the locking shaft 30 and the locking ring groove 29, thereby making the closing state of the closing mechanism 8 to the connecting pipe 5 more stable and reliable. In addition, elastic devices such as springs can be connected to both the locking shaft 30 and the detection shaft 33. For example, the natural state of the above-mentioned locking shaft 30 and the detection shaft 33 can be maintained by the cooperation of elastic force and hydraulic pressure.

[0054] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A device for detecting total phosphorus and total nitrogen (CODmn) in water, comprising a base (1), a detector (2) being arranged in the base (1), a chamber (3) being provided in the base (1), a water receiving hole (4) being provided at the top of the base (1) and being connected to the chamber (3), a connecting pipe (5) being arranged in the chamber (3) and being connected to the water receiving hole (4), the connecting pipe (5) being adapted to be able to guide a water sample into a solution bottle, a detection head being electrically connected to the detector (2) being arranged in the solution bottle, an electric core wire (6) being wound around the connecting pipe (5), wherein: The water receiving hole (4) is provided with a detection mechanism (7), the detection mechanism (7) is adapted to detect whether the impurities in the water sample passing through the water receiving hole (4) exceed a threshold value, the connecting pipe (5) is provided with a closing mechanism (8), the closing mechanism (8) is adapted to close the passage of the connecting pipe (5), the electric core wire (6) is located above the closing mechanism (8), and the detection mechanism (7) is electrically connected to the electric core wire (6); The detection mechanism (7) includes a TOC analyzer, a chromatograph or a spectrometer; Or a filter screen (10) is arranged in the water receiving hole (4), the detection mechanism (7) comprises a detection screen (11) arranged on the top of the filter screen (10), an elastic member (12) is connected to the detection screen (11), and a contact switch (13) is also arranged in the water receiving hole (4), and the contact switch (13) is electrically connected to the electric core wire (6); When the flow rate of the detection net (11) decreases and it is elastic under pressure, the detection net (11) can press the contact switch (13).

2. The device for detecting total phosphorus and total nitrogen in water according to claim 1, characterized in that: A liquid pumping mechanism (9) is provided on the top side wall of the connecting tube (5), and the liquid pumping mechanism (9) is adapted to be able to pump a digester into the connecting tube (5).

3. The detection device for total phosphorus and total nitrogen CODmn in water according to claim 1 or 2, characterized in that: The sealing mechanism (8) comprises a solenoid valve, and the sealing mechanism (8) is electrically connected to the detection mechanism (7).

4. The device for detecting total phosphorus and total nitrogen in water according to claim 1, characterized in that: Two closing mechanisms (8) are arranged along the axial direction of the connecting tube (5), and the electric core wire (6) is located between the two closing mechanisms (8).

5. The device for detecting total phosphorus and total nitrogen in water according to claim 1, characterized in that: The water filtering area on the detection net (11) and the water filtering area on the filter net (10) are arranged alternately, a pipe (14) is arranged between the top of the water receiving hole (4) and the top of the connecting pipe (5), a closing plate (15) is arranged on the top of the detection net (11), and a water trough (16) is provided on the closing plate (15); When the detection net (11) is in contact with the filter net (10), the water channel (16) is aligned with the pipeline (14); A locking piece (17) is also provided in the water receiving hole (4), and the locking piece (17) is adapted to maintain the fitting state between the detection net (11) and the filter net (10).

6. The device for detecting total phosphorus and total nitrogen in water according to claim 1, characterized in that: The sealing mechanism (8) comprises a sealing disk (18) and a driving shaft (19) rotatably arranged on the sealing disk (18); a water through hole (20) is provided on the sealing disk (18); a water blocking plate (21) is rotatably arranged in the water through hole (20) and is capable of sealing the water through hole (20); a first gear (22) is arranged on the rotating shaft of the water blocking plate (21); a second gear (23) is arranged on the driving shaft (19); and the second gear (23) is meshed with the first gear (22).

7. The device for detecting total phosphorus and total nitrogen in water according to claim 6, characterized in that: The driving shaft (19) passes through the detection net (11) upwards, and a spiral driving groove (24) is provided on the outer wall of the top end of the driving shaft (19), and a driving block (25) extending into the spiral driving groove (24) is provided on the inner hole wall of the detection net (11).

8. The device for detecting total phosphorus and total nitrogen in water according to claim 6, characterized in that: A connecting sleeve (26) is rotatably provided on the driving shaft (19), a magnetic ring (27) is provided on the connecting sleeve (26), the electric core wire (6) cooperates with the connecting pipe (5) to generate a magnetic field and drive the magnetic ring (27) to rotate, and a stirring net (28) is provided on the side wall of the connecting sleeve (26); The detection net (11) is provided with a locking ring groove (29), and the locking member (17) comprises a locking shaft (30) slidably arranged on the side wall of the driving shaft (19); When the detection net (11) and the filter net (10) are in contact with each other, the locking shaft (30) is inserted into the locking ring groove (29); An oil storage chamber (31) is provided in the driving shaft (19), and the oil storage chamber (31) is connected to the sliding hole of the locking shaft (30). A connecting hole (32) connected to the oil storage chamber (31) is provided on the side wall of the driving shaft (19), and the connecting hole (32) is opposite to the connecting sleeve (26). A detection shaft (33) is also slidably provided on the connecting sleeve (26), and the sliding hole of the detection shaft (33) is connected to the inner cavity of the connecting sleeve (26); The detection shaft (33) can slide to a protruding position under the action of centrifugal force, and at this time, the locking shaft (30) slides to a retracted position under the suction force of oil pressure to escape from the locking ring groove (29).

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