CN111351825A

CN111351825A - Sewage dissolved oxygen apparatus based on-line control

Info

Publication number: CN111351825A
Application number: CN202010251246.1A
Authority: CN
Inventors: 陈玉沼; 黄建科
Original assignee: Fujian Donghai Testing Technology Co ltd
Current assignee: Fujian Donghai Testing Technology Co ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-06-30
Anticipated expiration: 2040-04-01
Also published as: CN111351825B

Abstract

The invention discloses a sewage dissolved oxygen tester based on-line control, which structurally comprises a water taking pipe, a heat conducting metal strip, a water suction pipe, a floating ring, a solar cell panel, a vacuum pump, a wireless control module, a tester and an equipment main body, wherein the water taking pipe is arranged at the bottom of the equipment main body, the heat conducting metal strip is embedded and arranged outside the equipment main body, the water suction pipe is connected with the inside of the equipment main body, and the floating ring is arranged on the equipment main body. The specific data of the detection site are analyzed through comprehensive comparison, and the error of the data is reduced.

Description

Sewage dissolved oxygen apparatus based on-line control

Technical Field

The invention relates to a sewage dissolved oxygen tester based on-line control, belonging to the field of sewage detection.

Background

Amperometry measures the Dissolved Oxygen (DO) content of water based on the diffusion rate of molecular oxygen through the membrane. The film of the dissolved oxygen electrode only can permeate gas, and oxygen in the permeated gas diffuses into the electrolyte and immediately generates a reduction reaction on the cathode (anode); o2+2H2O +4e → 4OH-, oxidation occurs at the anode (negative electrode), such as a silver-silver chloride electrode: 4Ag +4Cl- → 4AgCl +4e, and the electric current generated by the above formula is proportional to the oxygen concentration, and the Dissolved Oxygen (DO) concentration can be obtained by measuring the electric current.

The prior art discloses the application numbers as follows: 201820716644.4, the fixed display screen that inlays in the front end upper portion of apparatus casing, the front end middle part left side of apparatus casing is equipped with the work pilot lamp, the front end west side middle part fixedly connected with shift knob of apparatus casing, the fixed adjustment button that is equipped with in front end lower part right side of apparatus casing, open the front end lower part left side of apparatus casing has the phonate hole.

The prior art discloses application number 201821308803.3's a portable dissolved oxygen apparatus, and its structure includes the casing, the inside of casing is provided with the apparatus body, the mounting groove has been seted up to the inside of apparatus body, the inside fixed mounting of mounting groove has the display screen, the inside fixed mounting of apparatus body has the operation panel, the inside fixed mounting of operation panel has the adjusting key, the both sides of adjusting key all are provided with the function button.

However, in both of the above two technologies, the manual in-situ examination and detection requires frequent running sampling and detection, and the sampling and analysis cannot be performed remotely, so that the efficiency is low, and the in-situ examination has certain potential safety hazard.

The prior art discloses an application number 201620549682.6's dissolved oxygen automatic control equipment, its structure includes rack and integrated touch display, main control unit, dissolved oxygen apparatus and the aeration machine controller in the rack, touch display is connected with main control unit's touch-control display end, dissolved oxygen apparatus's dissolved oxygen signal output part is connected with main control unit's dissolved oxygen signal input part, aeration machine controller's control signal input part is connected with main control unit's control signal output part.

However, the connection method adopted by the above technology is a real conductive wire connection, and if the detection ground is far away from the operation table, a plurality of long connecting wires need to be connected, so that the detection ground is easy to damage, easy to break and difficult to maintain.

The prior art discloses application number 201821099496.2's a dissolved oxygen apparatus, and its structure includes organism and detection stick, the bottom of organism is provided with the base, the rear skin weld of organism has the connecting plate, the rear side welding of connecting plate has the back splint, the right side surface upper portion of organism is provided with the fixing base, the middle part of going up the fixing base is provided with first draw-in groove, the right side surface lower part of organism is provided with down the fixing base.

However, the sampling mode of the technology is manual sampling, the sampled water depth has certain limitation, the pressure is different at different water depths, the oxygen content also has certain difference, the prior art can not carry out comprehensive analysis and detection at different depths, and therefore certain errors exist in the detection structure.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a sewage dissolved oxygen tester based on-line control to solve the existing problems.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a sewage dissolved oxygen apparatus based on-line control, its structure includes intake pipe, heat conduction metal strip, absorbs water pipe, floating ring, solar cell panel, vacuum pump, wireless control module, apparatus, equipment main part, the intake pipe is installed in equipment main part bottom, heat conduction metal strip embedding is installed in the equipment main part outside, the pipe that absorbs water is connected with equipment main part inside, floating ring installs in equipment main part, solar cell panel, vacuum pump, apparatus, wireless control module all install in equipment main part upper surface.

The measuring instrument comprises a film device, an electrolyte tank, a measuring instrument main body and a waste liquid tank, wherein the film device is embedded in one side of the measuring instrument main body, the electrolyte tank is communicated with the measuring instrument main body, and the waste liquid tank is communicated with the measuring instrument main body.

Further, the film device comprises a motor, a film, a communicating pipe, a screw, a rotating arm, a convex block, a chute and a cover plate, wherein the rotating shaft of the motor is fixedly connected with the rotating arm, the film is positioned below the cover plate, the convex block and the screw are both arranged at two sides, the convex block and the rotating arm are in an integrated structure at the left side, the left end of the film is in threaded connection with the convex block at the left side through the screw, the screw penetrates through the cover plate and the film and is in threaded connection with the convex block at the right side, the cross section of the chute is in a concave shape, the edge of the chute is in an arc shape, the communicating pipe is positioned below the chute and is fixedly connected with the chute, the communicating pipe is in a shape like a Chinese character 'ji', the top of the communicating pipe is open, the film is attached to the chute and is positioned above the, the motor and the tester main body are electrically connected with the wireless control module.

Further, the equipment main body comprises a pressurizing device, a hose, a metering valve and a temperature detection module, wherein the pressurizing device is arranged between the water taking pipe and the water suction pipe, the hose is communicated with the metering valve and the vacuum pump, the hose is communicated with the water taking pipe, and the temperature detection module is connected with the heat conducting metal strip.

Further, supercharging device includes drive gear, pressurization chamber, honeycomb duct, the drive gear axle center is connected with driving motor, drive gear meshes with drive gear mutually, drive gear all is located pressurization intracavity portion with drive gear, pressurization chamber all is linked together with water absorption pipe and honeycomb duct, the honeycomb duct is linked together with the water intaking pipe.

Furthermore, the water intake pipe comprises a first piston cavity, a guide hole, a drainage port, a drainage pipe, a third water suction pipe, a second piston, a second water suction pipe, a first piston, a second piston cavity and a first water suction pipe, the first piston is arranged in the first piston cavity, the guide hole is arranged in the first piston cavity and the second piston cavity, the second piston is arranged in the second piston cavity, the second piston and the third water suction pipe are of an integrated structure, the drainage port is positioned outside the first piston cavity, the second piston cavity and the drainage pipe are of an integrated structure with the first piston, the drainage pipe is positioned inside the drainage port, the first water suction pipe and the first piston are fixedly connected, the third water suction pipe, the second water suction pipe and the first water suction pipe are all positioned on the same axis and are mutually nested, waterproof rings are arranged at the joints, a filter screen is arranged at the bottom of the third water suction pipe, the first water suction pipe is connected with a hose.

Further, the floating ring is circular, the solar cell panel bottom is equipped with the battery, electrolyte tank and apparatus main part junction are equipped with one-way automatically controlled valve and this valve and wireless control module electric connection, waste liquid tank and apparatus main part junction are equipped with one-way automatically controlled valve and this valve and wireless control module electric connection, the intraductal portion that absorbs water is equipped with the filter screen.

Furthermore, the driving gear and the transmission gear are made of stainless steel materials and are firm and corrosion resistant.

Furthermore, the film adopts PETEE material's waterproof ventilated membrane, pack the electrolyte with the apparatus bulk phase adaptation in the electrolyte tank.

Has the advantages that: directly placing an equipment main body in a detection water tank, performing photoelectric conversion into equipment for power supply through a solar panel, remotely controlling and braking the start and stop of an electric appliance part of the invention by using a wireless control module, floating the equipment main body on the water surface through a floating ring, starting a vacuum pump by using a wireless control module, enabling a third water suction pipe and a second water suction pipe to generate negative pressure to suck detection water flow, enabling the detection water flow to pass through a metering valve, monitoring the water flow by the metering valve, discharging the detection water flow to the water tank again through a communicating pipe, enabling the detection water flow to pass through a thin film when passing through the communicating pipe, enabling the thin film to be waterproof and breathable so that water vapor enters a measuring instrument main body, detecting the measuring instrument main body, sending data to a remote terminal, starting a supercharging device if the detection water depth is required to be changed, enabling a driving gear to rotationally engage and brake, a low pressure is created and the liquid is sucked in and pushed by the wall of the housing to the other side. The two gears on the other side are mutually closed to form high pressure, and discharge the liquid to the guide pipe and enter the first piston cavity so as to push the first piston to move downwards, when the first piston is moved to the root part of the first piston cavity, the water flow enters the second piston cavity through the guide hole so as to push the second piston to move downwards, in the process of moving downwards of the second piston, the guide pipe is used for discharging the rest water from the drainage port, similarly, after the first piston or the second piston is extended out, the vacuum pump is used for sampling detection, after the equipment is used for a certain time, the motor can be started, the rotating arm is rotated by the rotating shaft, the new film and the two lugs slide into the sliding groove, the film is replaced, in the later maintenance, the screw can be unscrewed and the cover plate can be lifted to replace the film, the electrolyte is periodically discharged into the waste liquid tank through the valve connected with the waste liquid tank, the valve connected with the main body of the tester is used for periodically supplementing the new, the remote terminal is adopted to control the test device, so that frequent queen test places and test beds of personnel are avoided from running back and forth, efficiency is greatly improved, potential safety hazards existing in the test places of personnel going out are avoided, wired connection is avoided through wireless remote control, interference caused by site environment is small, corrosion or damage of wired connecting lines is avoided, the device can be used for sampling and detecting detection pools with different water pressure water depths, specific data of the detection places are analyzed through comprehensive comparison, and errors of the data are reduced.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of a three-dimensional structure of a sewage dissolved oxygen meter based on-line control according to the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1 according to the present invention;

FIG. 3 is a schematic diagram of the structure of FIG. 2 according to the present invention

FIG. 4 is a schematic view of a thin film device according to the present invention

FIG. 5 is a partial structural diagram of A in FIG. 4 according to the present invention

FIG. 6 is a schematic top view of the chute of the present invention

FIG. 7 is a schematic structural view of a supercharging device according to the present invention

FIG. 8 is a schematic view of the water intake pipe of the present invention in its unfolded configuration

FIG. 9 is a schematic view of the structure of the water intake pipe shrinking in the present invention

FIG. 10 is a schematic top view of the main body of the apparatus of the present invention.

In the figure: a water intake pipe-1, a heat conducting metal strip-2, a water suction pipe-3, a floating ring-4, a solar panel-5, a vacuum pump-6, a wireless control module-7, a determinator-8, an equipment main body-9, a film device-81, an electrolyte tank-82, a determinator main body-83, a waste liquid tank-84, a motor-811, a film-812, a communicating pipe-813, a screw-814, a rotating arm-815, a bump-816, a chute-817, a cover plate-818, a supercharging device-91, a hose-92, a metering valve-93, a temperature detection module-94, a driving gear-911, a transmission gear-912, a supercharging cavity-913, a flow guide pipe-914, a first piston cavity-101, a guide hole-102, a water pump-102, a water, A drainage port-103, a drainage pipe-104, a third suction pipe-105, a second piston-106, a second suction pipe-107, a first piston-108, a second piston cavity-109 and a first suction pipe-110.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to fig. 1 to 10, the present invention provides a technical solution of a dissolved oxygen measuring instrument for sewage based on-line control: the structure of the device comprises a water taking pipe 1, a heat conducting metal strip 2, a water suction pipe 3, a floating ring 4, a solar cell panel 5, a vacuum pump 6, a wireless control module 7, a determinator 8 and a device main body 9, wherein the water taking pipe 1 is installed at the bottom of the device main body 9, the heat conducting metal strip 2 is embedded and installed outside the device main body 9, the water suction pipe 3 is connected with the inside of the device main body 9, the floating ring 4 is installed on the device main body 9, the solar cell panel 5, the vacuum pump 6, the determinator 8 and the wireless control module 7 are all installed on the upper surface of the device main body 9, the determinator 8 comprises a thin film device 81, an electrolyte tank 82, a determinator main body 83 and a waste liquid tank 84, the thin film device 81 is embedded and installed on one side of the determinator main body 83, the electrolyte tank 82 is communicated with the determinator main body 83, and, the film device 81 comprises a motor 811, a film 812, a communicating pipe 813, screws 814, a rotating arm 815, two bumps 816, a chute 817 and a cover plate 818, wherein a rotating shaft of the motor 811 is fixedly connected with the rotating arm 815, the film 812 is positioned below the cover plate 818, the bumps 816 and the screws 814 are respectively provided, the bumps 816 and the rotating arm 815 on the left side are in an integrated structure, the left end of the film 812 is in threaded connection with the bumps 816 on the left side through the screws 814, the other screw 814 penetrates through the cover plate 818 and the film 812 and is in threaded connection with the bumps 816 on the right side, the cross section of the chute 817 is in a concave shape, the edge of the chute 817 is in an arc shape, the communicating pipe 813 is positioned below the chute 817 and is fixedly connected, the top of the communicating pipe 813 is in a shape like a Chinese character 'ji', the top of the communicating pipe 813 is an opening, the film 812 is attached to the chute 817 and positioned above the top of, the communicating pipe 813 is communicated with a metering valve 93, the motor 811 and the tester main body 83 are both electrically connected with a wireless control module 7, the equipment main body 9 comprises a pressurizing device 91, a hose 92, a metering valve 93 and a temperature detection module 94, the pressurizing device 91 is arranged between a water intake pipe 1 and a water suction pipe 3, the hose 92 is communicated with the metering valve 93 and a vacuum pump 6, the hose 92 is communicated with the water intake pipe 1, the temperature detection module 94 is connected with a heat conducting metal strip 2, the pressurizing device 91 comprises a driving gear 911, a transmission gear 912, a pressurizing cavity 913 and a guide pipe 914, the axis of the driving gear 911 is connected with a driving motor, the driving gear 911 is meshed with the transmission gear 912, the driving gear 911 and the transmission gear 912 are both positioned inside the pressurizing cavity 913, the pressurizing cavity 913 is both communicated with the water suction pipe 3 and the guide pipe 914, and the guide pipe 914, the water intake pipe 1 comprises a first piston cavity 101, a guide hole 102, a drainage port 103, a drainage pipe 104, a third suction pipe 105, a second piston 106, a second suction pipe 107, a first piston 108, a second piston cavity 109 and a first suction pipe 110, wherein the first piston 108 is installed in the first piston cavity 101, the guide hole 102 is installed in the first piston cavity 101 and the second piston cavity 109, the second piston 106 is installed in the second piston cavity 109, the second piston 106 and the third suction pipe 105 are of an integrated structure, the drainage port 103 is located outside the first piston cavity 101, the second piston cavity 109 and the drainage pipe 104 are of an integrated structure with the first piston 108, the drainage pipe 104 is located inside the drainage port 103, the first suction pipe 110 is fixedly connected with the first piston 108, the third suction pipe 105, the second suction pipe 107 and the first suction pipe 110 are all nested on the same axis and have waterproof rings at the connection positions, the third absorbs water and manages 105 bottoms and be equipped with the filter screen, first water absorption pipe 110 is connected with hose 92, the floating ring 4 is the ring form, 5 bottoms of solar cell panel are equipped with the battery, electrolyte tank 82 is equipped with one-way automatically controlled valve and this valve and wireless control module 7 electric connection with apparatus main part 83 junction, waste liquid tank 84 is equipped with one-way automatically controlled valve and this valve and wireless control module 7 electric connection with apparatus main part 83 junction, it is equipped with the filter screen to absorb water 3 bottoms of pipe, drive gear 911 all adopts stainless steel with drive gear 912, and is firm corrosion-resistant, film 812 adopts the waterproof ventilated membrane of PETFFE material, pack the electrolyte of filling and apparatus main part 83 looks adaptation in the electrolyte tank 82.

The electric appliance parts and the wireless control module 7 in the patent all adopt the common wireless drive connection technology, can be controlled by remote console radio or APP monitoring, belong to the prior art, the temperature detection module 94 is thermocouple temperature detection, it directly measures the temperature, and converts the temperature signal into the thermal electromotive force signal, and converts the temperature into the temperature of the measured medium through the electric instrument (secondary instrument), the apparatus main body 83 is the apparatus in the current measurement category, the model adopted can be HA-96DS, the precision is 0.1ug/L, and the main body protected by the invention is a mechanical device, and not the circuit connection diagram of the apparatus, therefore do not need to repeat the circuit part again, the electrolytic correction method can refer to a trace dissolved oxygen apparatus on-line calibration device and its calibration method with application number 201510755503.4.

The working principle is as follows: the device main body 9 is directly placed in a detection water pool, photoelectric conversion is carried out through a solar cell panel 5 to supply power to the device, the wireless control module 7 is used for remotely controlling and braking the start and stop of the electrical appliance part of the invention, the device main body 9 floats on the water surface through a floating ring 4, the wireless control module 7 is used for starting a vacuum pump 6, the vacuum pump 6 enables a third water suction pipe 105 and a second water suction pipe 107 to generate negative pressure to suck detection water flow, the detection water flow passes through a metering valve 93, the metering valve 93 monitors the water flow, the detection water flow is discharged to the water pool again through a communicating pipe 813, when the detection water flow passes through the communicating pipe 813, the membrane 812 is waterproof and breathable, water enters a measuring instrument main body 83, the measuring instrument main body 83 is used for detection, data is sent to a remote terminal, if the detection water depth is required to be changed, a pressurizing device 91 is started, a, the teeth of the two gears are separated from each other to form low pressure, liquid is sucked in and is pushed to the other side by the shell wall, the two gears on the other side are mutually closed to form high pressure, the liquid is discharged to the flow guide pipe 914 and enters the first piston cavity 101 to push the first piston 108 to move downwards, when the first piston 108 moves to the root of the first piston cavity 101, water flow enters the second piston cavity 109 through the guide hole 102 to push the second piston 106 to move downwards, the flow guide pipe 914 is used for discharging residual water from the discharge port 103 in the downward moving process of the second piston 106, similarly, after the first piston 108 or the second piston 106 extends out, the vacuum pump 6 is used for sampling detection, after the equipment is used for a certain time, the motor 811 can be started to rotate the braking rotating arm 815 by using the rotating shaft, a new film 812 and two bumps 816 slide into the sliding groove 817 to replace the film 812, and the film can be replaced by unscrewing the screws 814 and lifting the cover plate 818 during later maintenance, the electrolyte is periodically discharged into the waste liquid tank 84 through a valve connected to the waste liquid tank 84 and the meter main body 83, and new electrolyte is periodically replenished by the valve connected to the electrolyte tank 82 and the meter main body 83.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a sewage dissolved oxygen apparatus based on-line control which characterized in that: the water absorption device structurally comprises a water taking pipe (1), a heat conduction metal strip (2), a water absorption pipe (3), a floating ring (4), a solar cell panel (5), a vacuum pump (6), a wireless control module (7), a determinator (8) and an equipment main body (9), wherein the water taking pipe (1) is installed at the bottom of the equipment main body (9), the heat conduction metal strip (2) is installed outside the equipment main body (9) in an embedded mode, the water absorption pipe (3) is connected with the inside of the equipment main body (9), the floating ring (4) is installed on the equipment main body (9), and the solar cell panel (5), the vacuum pump (6), the determinator (8) and the wireless control module (7) are all installed on the upper surface of the equipment main body (9).

2. The sewage dissolved oxygen tester based on-line control of claim 1, characterized in that: the tester (8) comprises a film device (81), an electrolyte tank (82), a tester main body (83) and a waste liquid tank (84), wherein the film device (81) is embedded in one side of the tester main body (83), the electrolyte tank (82) is communicated with the tester main body (83), and the waste liquid tank (84) is communicated with the tester main body (83).

3. The sewage dissolved oxygen tester based on-line control of claim 2, characterized in that: the film device (81) comprises a motor (811), a film (812), a communicating pipe (813), screws (814), a rotating arm (815), a convex block (816), a chute (817) and a cover plate (818), wherein a rotating shaft of the motor (811) is fixedly connected with the rotating arm (815), the film (812) is positioned below the cover plate (818), two convex blocks (816) and two screws (814) are arranged on the left side, the convex block (816) and the rotating arm (815) on the left side are of an integrated structure, the left end of the film (812) is in threaded connection with the convex block (816) on the left side through the screws (814), the other screw (814) penetrates through the cover plate (818) and the film (812) to be in threaded connection with the convex block (816) on the right side, the cross section of the chute (817) is in a concave shape, the edge of the communicating pipe is in an arc shape, the communicating pipe (813) is positioned below the chute (817) and is fixedly connected, and the communicating, the top of the communicating pipe (813) is provided with an opening, the thin film (812) is attached to the sliding groove (817) and is positioned above the top of the communicating pipe (813) and is above the opening, the left side of the cover plate (818) is movably connected with the rotating arm (815) through a hinge part, the communicating pipe (813) is communicated with the metering valve (93), and the motor (811) and the determinator main body (83) are electrically connected with the wireless control module (7).

4. The sewage dissolved oxygen tester based on-line control of claim 1, characterized in that: the equipment main body (9) comprises a pressurizing device (91), a hose (92), a metering valve (93) and a temperature detection module (94), wherein the pressurizing device (91) is arranged between the water taking pipe (1) and the water suction pipe (3), the hose (92) is communicated with the metering valve (93) and the vacuum pump (6), the hose (92) is communicated with the water taking pipe (1), and the temperature detection module (94) is connected with the heat conducting metal strip (2).

5. The online control-based dissolved oxygen meter for sewage according to claim 4, wherein: supercharging device (91) is including drive gear (911), drive gear (912), pressurization chamber (913), honeycomb duct (914), drive gear (911) axle center is connected with driving motor, drive gear (911) and drive gear (912) mesh mutually, drive gear (911) and drive gear (912) all are located pressurization chamber (913) inside, pressurization chamber (913) all are linked together with water absorption pipe (3) and honeycomb duct (914), honeycomb duct (914) are linked together with intake pipe (1).

6. The online control-based dissolved oxygen meter for sewage according to claim 5, wherein: the water taking pipe (1) comprises a first piston cavity (101), a guide hole (102), an exhaust hole (103), an exhaust pipe (104), a third suction pipe (105), a second piston (106), a second suction pipe (107), a first piston (108), a second piston cavity (109) and a first suction pipe (110), wherein the first piston (108) is installed in the first piston cavity (101), the guide hole (102) is arranged in the first piston cavity (101) and the second piston cavity (109), the second piston (106) is installed in the second piston cavity (109), the second piston (106) and the third suction pipe (105) are of an integrated structure, the exhaust hole (103) is positioned on the outer side of the first piston cavity (101), the second piston cavity (109) and the exhaust pipe (104) are of an integrated structure with the first piston (108), and the exhaust pipe (104) is positioned on the inner side of the exhaust hole (103), the first water suction pipe (110) is fixedly connected with the first piston (108), the third water suction pipe (105), the second water suction pipe (107) and the first water suction pipe (110) are all arranged on the same axis, are mutually nested, are provided with waterproof rings at the connection positions, a filter screen is arranged at the bottom of the third water suction pipe (105), and the first water suction pipe (110) is connected with the hose (92).

7. The sewage dissolved oxygen tester based on-line control of claim 2, characterized in that: the solar cell panel is characterized in that the floating ring (4) is in a circular ring shape, a storage battery is arranged at the bottom of the solar cell panel (5), a one-way electric control valve is arranged at the joint of the electrolyte tank (82) and the tester main body (83) and is electrically connected with the wireless control module (7), and a one-way electric control valve is arranged at the joint of the waste liquid tank (84) and the tester main body (83) and is electrically connected with the wireless control module (7).