CN107907644B - COD water sample metering device and method with functions of preventing oxidization and eliminating air interference - Google Patents
COD water sample metering device and method with functions of preventing oxidization and eliminating air interference Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 230000008030 elimination Effects 0.000 claims abstract description 8
- 238000003379 elimination reaction Methods 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- QXJJQWWVWRCVQT-UHFFFAOYSA-K calcium;sodium;phosphate Chemical compound [Na+].[Ca+2].[O-]P([O-])([O-])=O QXJJQWWVWRCVQT-UHFFFAOYSA-K 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012250 organic toxicant Substances 0.000 description 1
- 231100001119 organic toxicant Toxicity 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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Abstract
A COD water sample metering device and method with oxidation prevention and air interference elimination functions. The device comprises a water pump, a number 1 three-way electromagnetic valve, a number 2 three-way electromagnetic valve, a quantitative container, a flowmeter and a control unit; the liquid inlet pipe is connected with the No. 1 three-way electromagnetic valve and then sequentially connected with the water pump, the No. 2 three-way electromagnetic valve and the flowmeter to the quantitative container through the flow guide pipe, and the quantitative container is connected with the No. 1 three-way electromagnetic valve through the flow guide pipe, and the No. 2 three-way electromagnetic valve is also connected with the liquid outlet pipe; the round hole of ration container upper end links to each other with the exhaust hose after connecting the air duct, and the exhaust hose other end is equipped with electromagnetic switch valve, and the one end that the air duct is close to the round hole is equipped with limit switch, and limit switch is connected with the water pump electricity, has the floater in the ration container, and the air duct is equipped with the gyro wheel pair outward, and the control unit is connected with limit switch, water pump, three-way solenoid valve, gyro wheel pair and flowmeter respectively. The invention not only can realize accurate metering of the water sample, but also can prevent advanced oxidation and eliminate interference of bubbles on metering.
Description
Technical Field
The invention relates to a liquid metering device and a liquid metering method, in particular to a COD water sample metering device and a COD water sample metering method with oxidation prevention and air interference elimination functions.
Background
Water pollution is the reduction or loss of the use value of water caused by harmful substances, and even environmental pollution. Organic toxicants such as benzene, dichloroethane and ethylene glycol in the sewage can poison aquatic organisms and influence the drinking water source and scenic spot landscape. When organic matters in the sewage are decomposed by microorganisms, oxygen in the water is consumed, the life of aquatic organisms is influenced, after dissolved oxygen in the water is consumed, the organic matters are anaerobically decomposed, and bad gases such as hydrogen sulfide, mercaptan and the like are generated, so that the water quality is further deteriorated. To protect the water environment, sewage discharge and water quality in the water area must be monitored.
Chemical oxygen demand COD (ChemicalOxygenDemand) is an oxygen equivalent that can react with waste water, wastewater treatment plant effluent and contaminated water and is an important indicator of water pollution, and it mainly uses chemical oxidants to oxidize the reducing substances in the water sample and then calculates the oxygen consumption from the remaining oxidants. The COD measurement process has high requirement on the metering precision of water samples and reagents, and errors in metering or the error of monitoring results caused by oxidation generated by overlong contact time with air in the metering process can cause interference to the judgment of the pollution degree of water bodies.
The traditional metering mode of water sample and reagent by using peristaltic pump can obtain relatively accurate liquid according to the set requirement, but the honeycomb duct has deformation, abrasion, aging corrosion and other conditions under the long-time extrusion action, so that the closed sampling mode has certain potential safety hazards, bubbles are easily extracted in the sampling process, and residual bubbles are finally arranged in the honeycomb duct, thereby influencing the sampling precision; in addition, another common COD sampling method based on photoelectric metering is that most of water samples are exposed in the air, the water samples are easily oxidized in advance in the slow extraction process, and meanwhile, the metering precision is influenced by pollution of photoelectric metering devices, metering tube walls and the like, sampling flow rate and the like, so that the precision is low, the structure is complex, periodic cleaning is needed, and the maintenance cost is high.
In summary, at present, most COD sampling modes do not consider the influence of bubbles contained in a water sample on measurement accuracy, and also do not consider the interference of advanced oxidation of the water sample, which is exposed to air for a long time in extraction and measurement, on measurement results.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the COD water sample metering device and the method with the functions of preventing oxidization and eliminating air interference, which not only can realize accurate metering of water samples, but also can prevent advanced oxidization and eliminate the interference of bubbles on metering, and are convenient to install and use and low in maintenance cost.
The technical scheme adopted for solving the technical problems is as follows:
a COD water sample metering device with oxidation prevention and air interference elimination functions comprises a water pump, a number 1 three-way electromagnetic valve, a number 2 three-way electromagnetic valve, a quantitative container, a flowmeter and a control unit; the liquid inlet pipe is connected with the No. 1 three-way electromagnetic valve and then sequentially connected with the water pump, the No. 2 three-way electromagnetic valve and the flowmeter to the quantitative container through the flow guide pipe, the quantitative container is connected with the No. 1 three-way electromagnetic valve through one flow guide pipe, and the No. 2 three-way electromagnetic valve is also connected with one liquid discharge pipe; the upper end of the quantitative container is provided with a contracted round hole, the outside of the round hole is connected with an air duct, the other end of the air duct is connected with an exhaust hose, the other end of the exhaust hose is provided with an electromagnetic switch valve, one end of the air duct, which is close to the round hole, is provided with a limit switch, the limit switch is electrically connected with a water pump, a floating ball is placed in the quantitative container, and a roller pair is arranged outside an air duct D, which is connected with the exhaust hose, of the air duct; the control unit is respectively connected with the limit switch water pump, the number 1 three-way electromagnetic valve, the number 2 three-way electromagnetic valve, the flowmeter and the roller pair.
A COD water sample metering method with oxidation prevention and air interference elimination comprises the following metering steps:
1) Initializing equipment: when COD is monitored, the volume V of a single collected water sample is determined according to the requirement of chemical reaction, and the volume of a quantitative container is initialized, so that the volume of the water sample injected into the quantitative container is just V when the floating ball touches the limit switch to act; or when the floating ball touches the limit switch through the flowmeter, quantifying the volume V of the water sample injected into the container, and taking the volume V as the volume of the water sample reflected by COD; 2) Extracting a water sample: when a water sample is extracted, the No. 1 three-way electromagnetic valve and the No. 2 three-way electromagnetic valve act simultaneously, so that a water inlet A, a flow guide pipe, the No. 1 three-way electromagnetic valve, a flow guide pipe, a water pump, a flow guide pipe, the No. 2 three-way electromagnetic valve, a flow guide pipe, a flowmeter and a flow guide pipe form a first passage; after the water pump works, the water sample reaches the quantitative container along the first passage from the water inlet A, and the water sample extraction process is terminated after the floating ball touches the limit switch along with the continuous collection of the water sample; meanwhile, the water sample extraction amount is primarily measured through a flowmeter, the water pump performs high-rotation-speed and high-flow water sample extraction before 90% of the volume of the quantitative container is occupied by the water sample, and the water pump performs low-rotation-speed and low-flow water sample extraction after 90% of the volume of the quantitative container is occupied by the water sample;
3) Transferring a water sample: the three-way electromagnetic valve No. 1 and the three-way electromagnetic valve No. 2 act simultaneously, so that a second passage is formed by the guide pipe, the three-way electromagnetic valve No. 1, the guide pipe, the water pump, the three-way electromagnetic valve No. 2, the liquid discharge pipe and the water outlet B, after the water pump works, a water sample is transferred from the quantitative container along the second passage from the water outlet B, along with continuous collection of the water sample, after the floating ball touches the limit switch, the water pump stops working, and the water sample extraction process is ended; 4) Evacuating the bubbles: firstly, two rollers of the roller pair are mutually closed until the exhaust hose is internally compressed to enable the air guide port D to be in a closed state, and meanwhile, an electromagnetic switch valve in a normally closed state is opened; secondly, rolling from the air guide port D to the air outlet E through the roller pair, and discharging the air in the air discharge hose through the air outlet E; then, the roller rolls in the opposite direction until returning to the air guide port D; finally, the two rollers of the roller pair are separated and reset, and the electromagnetic switch valve is closed.
Compared with the prior art, the COD water sample metering device and the COD water sample metering method with the functions of oxidation prevention and air interference elimination realize water sample extraction and water sample evacuation through different connection modes of the valve ports of the electromagnetic valve, the floating ball is used for starting the limit switch, and the water pump is closed to realize accurate water sample metering. In addition, due to the existence of the exhaust hose, the contact with the outside air in the water sample extraction metering and emptying processes is avoided, so that the air bubbles mixed with the water sample can be smoothly discharged, and the water sample metering accuracy is improved.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the components for extracting and transferring water samples in one embodiment of the invention;
FIG. 2 is a schematic diagram of the components involved in evacuating a bubble in one embodiment of the invention.
In the figure: 1. a three-way electromagnetic valve No. 1; 2. a water pump; 3. a No. 2 three-way electromagnetic valve; 4. a flow meter; 5. a dosing container; 6. a floating ball; 7. a limit switch; 8. a roller pair; 9. an exhaust hose; 10. an electromagnetic switch valve 11 and a liquid inlet pipe; 12-15, 17, a honeycomb duct; 16. a liquid discharge pipe; 18. a round hole; 19. a cover; 20. an air duct; 21. and a control unit.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Fig. 1 and 2 show a schematic structural diagram of a preferred embodiment of the present invention, wherein the COD water sample metering device with oxidation prevention and air interference elimination in fig. 1 comprises a water pump 2 for extracting water sample or reagent, a No. 1 three-way electromagnetic valve 1, a No. 2 three-way electromagnetic valve 3, a liquid inlet pipe 11, guide pipes 12-15 and 17, a quantitative container 5, a flowmeter 4, a control unit 21, a liquid discharge pipe 16 and an air duct 20, wherein an a port of the water pump 2 is connected with a port of the No. 1 three-way electromagnetic valve 1 through the guide pipe 12, a port of the water pump 2 is connected with a port of the No. 2 three-way electromagnetic valve 3 through the guide pipe 13, a port and b port of the No. 1 three-way electromagnetic valve 1 are respectively connected with the liquid inlet pipe 11 and the guide pipe 17, the guide pipe 17 is connected with the quantitative container 5, the quantitative container 5 is connected with the flowmeter 4 through the guide pipe 15, the flowmeter 4 is connected with b port of the No. 2 three-way electromagnetic valve 3 through the guide pipe 14, and a port of the No. 2 three-way electromagnetic valve 3 is connected with the liquid discharge pipe 16; the lower part of the quantitative container 5 is cylindrical, the upper sealing cover 19 and the bottom of the quantitative container are acute angles, a round hole 18 is formed in the center of the sealing cover 19, and the right upper part of the edge of the round hole 18 is connected with an air duct 20; a limit switch 7 is arranged at one end of the air duct 20, which is close to the round hole 18, the limit switch 7 is electrically connected with the water pump 2, and a floating ball 6 is arranged in the quantitative container 5; the air guide port C and the air guide port D of the connector of the air guide pipe 20 are matched and installed, so that the water sample extracting and transferring component of the embodiment 1 and the air bubble exhausting component of the embodiment 2 are connected into a whole, and the COD water sample metering device of the embodiment is formed, as shown in the embodiment 2, and is connected with the air exhaust hose 9 through the air guide port D, the other end of the air exhaust hose 9 is provided with an electromagnetic switch valve 10, and a roller pair 8 is arranged outside the air guide port D, which is connected with the air guide pipe 20 and the air exhaust hose 9, of the embodiment. The control unit 21 is respectively connected with the limit switch 7, the water pump 2, the three-way electromagnetic valve 1 No. 1, the three-way electromagnetic valve 3 No. 2, the flowmeter 4 and the roller pair 8.
In this embodiment, the diameter of the round hole 18 is slightly larger than the diameter of the floating ball 6; the distance between the limit switch 7 and the plane where the round hole 18 is located is slightly smaller than the diameter of the floating ball 6;
in a preferred design of this embodiment, the flow guiding pipes 12, 13, 14, 15, 17, the liquid inlet pipe 11, the liquid outlet pipe 16 and the floating ball 6 are made of corrosion-resistant materials, such as polytetrafluoroethylene, and the floating ball 6 is hollow.
The metering steps are as follows:
1) Initializing equipment: when COD is monitored, the volume V of a single collected water sample is determined according to the requirement of chemical reaction, and the volume of the quantitative container 5 is initialized, so that when the floating ball 6 touches the limit switch 7 to act, the volume of the water sample injected into the quantitative container 5 is just V; or when the floating ball 6 is obtained through the flowmeter 4 to trigger the limit switch 7, the volume V of the water sample injected by the container 5 is quantified, and the volume V is taken as the water sample volume reflected by COD. Preferably, at the time of equipment initialization, glass balls with different volumes can be manufactured and placed into the quantitative container 5, so that different quantitative volumes V of water samples can be obtained.
2) Extracting a water sample: when a water sample is extracted, the No. 1 three-way electromagnetic valve 1 acts, so that an a valve port and a c valve port of the three-way electromagnetic valve are communicated. Meanwhile, the No. 2 three-way electromagnetic valve 3 also acts, so that the valve port a and the valve port b are communicated. So that the water inlet A, the flow guide pipe 11, the No. 1 three-way electromagnetic valve 1, the flow guide pipe 12, the water pump 2, the flow guide pipe 13, the No. 2 three-way electromagnetic valve 3, the flow guide pipe 14, the flowmeter 4 and the flow guide pipe 15 form a first passage. After the water pump 2 is operated, the water sample reaches the dosing container 5 from the water inlet a along the first path. Along with the continuous collection of the water sample, when the floating ball 6 touches the limit switch 7, the water pump 2 stops working, and the water sample extraction process is terminated. And meanwhile, the water sample extraction amount is preliminarily measured through the flowmeter 4. Before 90% of the volume of the quantitative container 5 is occupied by the water sample, the water pump 2 performs high-rotation-speed and high-flow water sample extraction, and when 90% of the volume of the quantitative container 5 is occupied by the water sample, the water pump 2 performs low-rotation-speed and low-flow water sample extraction, so that accurate metering is achieved, and meanwhile, the water sample extraction time is shortened.
3) Transferring a water sample: the three-way electromagnetic valve 1 is operated so that the port B and the port c of the three-way electromagnetic valve 1 are communicated, and the three-way electromagnetic valve 3 is operated so that the port a and the port c of the three-way electromagnetic valve 3 are communicated, so that the flow guide pipe 17, the three-way electromagnetic valve 1, the flow guide pipe 12, the water pump 2, the flow guide pipe 13, the three-way electromagnetic valve 3, the liquid discharge pipe 16 and the water discharge port B form a second passage. After the water pump 2 is operated, the water sample flows from the water discharge port B along the second passage from the dosing container 5. Along with the continuous collection of the water sample, when the floating ball 6 touches the limit switch 7, the water pump 2 stops working, and the water sample extraction process is terminated.
4) Evacuating the bubbles: during the water sample extraction process, the water sample passing through the flow meter 4 or reaching the dosing container 5 is likely to contain a certain amount of bubbles, which enter the air discharge hose 9 along with the air duct 20. The main purpose of this step is to evacuate the gas from the exhaust hose. Firstly, the two rollers of the roller pair 8 are mutually closed until the exhaust hose 9 is tightly pressed, so that the air guide port D is in a closed state, and the electromagnetic switch valve 10 in a normally closed state is opened; secondly, rolling from the air guide port D to the air outlet E through the roller pair 8, and discharging the air in the air discharge hose 9 through the air outlet E; then, the roller pair 8 rolls reversely until returning to the air guide port D; finally, the two rollers of the roller pair 8 are separated and reset, and the electromagnetic switch valve 10 is closed.
According to the embodiment, the metering of the water sample is converted into the metering of the quantitative container 5, and the accurate metering of the water sample is realized in a mode that the floating ball 6 touches the limit switch 7. Meanwhile, the combination scheme of glass spheres with different volumes is manufactured by considering that different COD monitoring is different in volumes of water samples, so that the initialization of water sample metering is realized. In addition, in the water sample extraction and metering process, the whole water sample is isolated from the outside air, so that the advanced oxidation phenomenon is prevented. Finally, the embodiment of the invention fully considers the influence of the bubbles on the measurement, and the bubbles are successfully extruded into the exhaust hose 9 before the floating ball 6 touches the limit switch 7, so that the interference of the bubbles on the measurement is discharged. Finally, the invention has the advantages of convenient installation and use and low maintenance cost.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, but any simple modification and equivalent variation of the above embodiment according to the technical spirit of the present invention falls within the scope of the present invention.
Claims (5)
1. The method for water sample metering by using the COD water sample metering device with oxidation prevention and air interference elimination is characterized in that the device comprises a water pump (2), a number 1 three-way electromagnetic valve (1), a number 2 three-way electromagnetic valve (3), a quantitative container (5), a flowmeter (4) and a control unit (21); the liquid inlet pipe (11) is connected with the No. 1 three-way electromagnetic valve (1) and then sequentially connected with the water pump (2), the No. 2 three-way electromagnetic valve (3) and the flowmeter (4) to the quantitative container (5) through the flow guide pipe, the quantitative container (5) is connected with the No. 1 three-way electromagnetic valve (1) through one flow guide pipe, and the No. 2 three-way electromagnetic valve (3) is also connected with one liquid discharge pipe (16); the upper end of the quantitative container (5) is provided with a contracted round hole (18), the outside of the round hole (18) is connected with an air duct (20), the other end of the air duct (20) is connected with an air exhaust hose (9), the other end of the air exhaust hose (9) is provided with an electromagnetic switch valve (10), one end, close to the round hole (18), of the air duct (20) is provided with a limit switch (7), the limit switch (7) is electrically connected with a water pump (2), a floating ball (6) is placed in the quantitative container (5), and a roller pair (8) is arranged outside an air duct D connected with the air duct (20) and the air exhaust hose (9); the control unit (21) is respectively connected with the limit switch (7), the water pump (2), the number 1 three-way electromagnetic valve (1), the number 2 three-way electromagnetic valve (3), the flowmeter (4) and the roller pair (8); the port a of the water pump (2) is connected with the port c of the three-way electromagnetic valve 1 through a flow guide pipe, and the port b of the water pump (2) is connected with the port a of the three-way electromagnetic valve 3 2 through a flow guide pipe; the valve port a and the valve port b of the No. 1 three-way electromagnetic valve (1) are respectively connected with a liquid inlet pipe (11) and a flow guide pipe, the flow guide pipe is connected with a quantitative container (5), the quantitative container (5) is connected with a flowmeter (4) through the flow guide pipe, the flowmeter (4) is connected with the valve port b of the No. 2 three-way electromagnetic valve (3) through the flow guide pipe, and the valve port c of the No. 2 three-way electromagnetic valve (3) is connected with a liquid discharge pipe (16);
the COD water sample metering step by using the device is as follows:
1) Initializing equipment: when COD is monitored, the volume V of a single collected water sample is determined according to the requirement of chemical reaction, and the volume of the quantitative container (5) is initialized, so that when the floating ball (6) touches the limit switch (7) to act, the volume of the water sample injected into the quantitative container (5) is just V; or when the floating ball (6) is obtained through the flowmeter to trigger the limit switch (7), quantifying the volume V of the water sample injected by the container (5) and taking the volume V as the volume of the water sample reflected by COD;
2) Extracting a water sample: when a water sample is extracted, the three-way electromagnetic valve 1 and the three-way electromagnetic valve 2 act simultaneously, so that a water inlet A, a flow guide pipe, the three-way electromagnetic valve 1, the flow guide pipe, a water pump 2, the flow guide pipe, the three-way electromagnetic valve 2 (3), the flow guide pipe, a flowmeter 4 and the flow guide pipe form a first passage; after the water pump (2) works, the water sample reaches the quantitative container (5) along the first passage from the water inlet A, and the water sample extraction process is terminated after the floating ball (6) touches the limit switch (7) along with continuous collection of the water sample; meanwhile, the water sample extraction amount is primarily measured through the flowmeter (4), the water pump (2) performs high-rotation-speed large-flow water sample extraction before 90% of the volume of the quantitative container (5) is occupied by the water sample, and the water pump (2) performs low-rotation-speed small-flow water sample extraction after 90% of the volume of the quantitative container (5) is occupied by the water sample;
3) Transferring a water sample: the three-way electromagnetic valve 1 and the three-way electromagnetic valve 3 are simultaneously operated, so that a second passage is formed by the flow guide pipe, the three-way electromagnetic valve 1, the flow guide pipe, the water pump 2, the flow guide pipe, the three-way electromagnetic valve 3, the liquid discharge pipe 16 and the water outlet B, after the water pump 2 works, a water sample is transferred from the quantitative container 5 along the second passage from the water outlet B, along with continuous collection of the water sample, when the floating ball 6 touches the limit switch 7, the water pump 2 stops working, and the water sample extraction process is ended;
4) Evacuating the bubbles: firstly, two rollers of two roller pairs (8) are mutually closed until the exhaust hose (9) is tightly pressed, so that the air guide port D is in a closed state, and an electromagnetic switch valve (10) in a normally closed state is opened; secondly, rolling from the air guide port D to the air outlet E through the roller pair (8), and discharging the air in the air discharge hose (9) through the air outlet E; then, the roller pair (8) rolls reversely until returning to the air guide port D; finally, the two rollers of the roller pair (8) are separated and reset, and the electromagnetic switch valve (10) is closed.
2. The method for water sample metering using a COD water sample metering device with oxidation prevention and air interference rejection according to claim 1, wherein: in the initialization of the device, glass balls with different volumes are manufactured and put into a quantitative container (5), so that different quantitative volumes V of water samples are obtained.
3. The method for water sample metering by using a COD water sample metering device with oxidation prevention and air interference elimination according to claim 1, wherein the method comprises the following steps: the lower part of the quantitative container (5) is cylindrical, the upper sealing cover (19) and the bottom of the quantitative container are acute angles, a round hole (18) is formed in the center of the sealing cover (19), and the right upper part of the edge of the round hole (18) is connected with an air duct (20).
4. A method of water sample metering using a COD water sample metering device with oxidation prevention and air interference rejection as claimed in claim 3, wherein: the diameter of the round hole (18) is slightly larger than that of the floating ball (6); the distance between the limit switch (7) and the plane where the round hole (18) is located is slightly smaller than the diameter of the floating ball (6).
5. A method of water sample metering using a COD water sample metering device with oxidation prevention and air interference rejection as claimed in claim 3, wherein: the honeycomb duct, the liquid inlet pipe (11), the liquid discharge pipe (16) and the floating ball (6) are made of corrosion-resistant materials, and the floating ball (6) is hollow.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711191272.4A CN107907644B (en) | 2017-11-24 | 2017-11-24 | COD water sample metering device and method with functions of preventing oxidization and eliminating air interference |
| PCT/CN2018/082802 WO2019100643A1 (en) | 2017-11-24 | 2018-04-12 | Cod water sample metering device having oxidation resistance and air interference eliminating effect and method |
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| CN201711191272.4A CN107907644B (en) | 2017-11-24 | 2017-11-24 | COD water sample metering device and method with functions of preventing oxidization and eliminating air interference |
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| CN108444562B (en) * | 2018-06-21 | 2023-12-05 | 水利部南京水利水文自动化研究所 | Liquid volume metering device |
| CN109187902B (en) * | 2018-09-19 | 2021-06-15 | 衡阳师范学院 | Intermittent continuous sampling water radon measuring device and method |
| CN109489764A (en) * | 2018-12-18 | 2019-03-19 | 中国矿业大学(北京) | A kind of laboratory scale gas volume self-measuring device and method |
| CN116804602A (en) * | 2023-08-24 | 2023-09-26 | 河南琢磨检测研究院有限公司 | Water quality analysis equipment for acquiring samples by multiple parameters |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019100643A1 (en) | 2019-05-31 |
| CN107907644A (en) | 2018-04-13 |
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