CN116296603A - Fluid sampling method and sampler using same - Google Patents
Fluid sampling method and sampler using same Download PDFInfo
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- CN116296603A CN116296603A CN202310542337.4A CN202310542337A CN116296603A CN 116296603 A CN116296603 A CN 116296603A CN 202310542337 A CN202310542337 A CN 202310542337A CN 116296603 A CN116296603 A CN 116296603A
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- 238000005070 sampling Methods 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000012530 fluid Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 320
- 238000002156 mixing Methods 0.000 claims abstract description 75
- 238000007599 discharging Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000000717 retained effect Effects 0.000 claims description 12
- 230000002209 hydrophobic effect Effects 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 230000003028 elevating effect Effects 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 238000012864 cross contamination Methods 0.000 abstract description 12
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 description 61
- 230000002572 peristaltic effect Effects 0.000 description 23
- 238000003756 stirring Methods 0.000 description 17
- 230000000903 blocking effect Effects 0.000 description 10
- 238000011010 flushing procedure Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 7
- 239000013505 freshwater Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 241001411320 Eriogonum inflatum Species 0.000 description 3
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- 230000002829 reductive effect Effects 0.000 description 3
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005842 biochemical reaction 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
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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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
- G01N2001/1031—Sampling from special places
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of environmental protection monitoring, and discloses a fluid sampling method and a sampler using the same, wherein the fluid sampling method comprises the following steps: s1, sucking a water sample to an overflow box by a sampling pump, and conveying the old water sample out of a metering cup of the overflow box; s2, after the sampling pump is stopped, the water sample in the metering cup flows into the mixing box; s3, intermittently repeating the steps S1 to S2 for a plurality of times; s4, part of the water sample in the mixing box is pumped to the on-line water quality analysis equipment through a sample supply pump, and part of the water sample in the mixing box is reserved in a designated sample reserving bottle through a sample reserving assembly; if the water sample is qualified, evacuating the corresponding water sample, and if the water sample is unqualified, reserving the corresponding water sample; s5, before the next sampling cycle, the sampling pump pumps the water sample and washes the mixing box; s6, repeating the steps S1 to S5 until all the sample reserving bottles reserve water samples. By the method, cross contamination among different water samples is effectively avoided.
Description
Technical Field
The invention relates to the technical field of environmental protection monitoring, in particular to a fluid sampling method and a sampler using the same.
Background
In the water environment monitoring process, the water quality pollution condition needs to be reflected truly and objectively, although a considerable amount of water quality monitoring equipment is deployed and installed in various places, the fluctuation range of the components and the flow of discharged sewage is large in a short time due to other reasons such as production or manpower, and the data of online water quality analysis equipment such as COD, ammonia nitrogen, total phosphorus, total nitrogen and the like cannot truly reflect the actual condition, so that a correct acquisition method and acquisition equipment are urgently needed to cope with the complex water body pollution condition.
For this reason, the national published "Water pollution Source on-line monitoring System (CODCr, NH3-N, etc.) installation technical Specification (HJ 353-2019) takes relevant measures for the above situations. The HJ353-2019 standard defines that the water pollution source on-line monitoring system comprises a water quality automatic sampling unit, and the water quality automatic monitoring station for unattended real-time monitoring is established to perform timing sampling detection on the monitoring points.
The automatic fluid sampling device comprises a peristaltic pump and a self-priming pump, wherein the self-priming pump is arranged near a sampling point, the peristaltic pump is arranged in the device, the self-priming pump conveys a water sample to the peristaltic pump, and the peristaltic pump is used for realizing quantitative sampling of the water sample so as to meet the quantitative sampling requirement of unit time. However, as a considerable amount of old water sample exists in the pipeline between the peristaltic pump and the self-priming pump, the old water sample can enter the water tank preferentially during the next sampling, so that the scientificity of sampling is affected, and before the next sampling, the peristaltic pump also needs to reverse to discharge the old water sample in the pipeline to the direction of the self-priming pump. In the process, although the self-priming pump is stopped, the peristaltic pump still has certain pressure on the pipeline, so that the peristaltic pump also needs to overcome the pressure of the self-priming pump on the pipeline to discharge the old water sample in the pipeline to the outside when the peristaltic pump is reversed, the farther the sampling point is away from the sampling equipment, the larger the power required by the peristaltic pump is, and in the process, the peristaltic pump and the internal hose thereof are easily damaged, so that the failure rate of the sampling equipment is high.
In order to overcome the technical problems, on the basis of the prior art, a pump-free sampler as disclosed in publication No. CN114705498A is provided, the technical scheme abandons the traditional peristaltic pump, and equipment faults caused by the peristaltic pump are avoided under the condition of unchanged use effect. Although the existing sampler can overcome equipment faults caused by peristaltic pumps, the problem of cross contamination among different water samples exists in the sampling process, and the results of online water quality analysis and the quality of the reserved water samples can be directly affected.
Disclosure of Invention
The present invention is directed to a fluid sampling method that overcomes one or more of the problems of the prior art, and provides at least one of a beneficial choice or creation.
An embodiment of a fluid sampling method according to a first aspect of the present invention comprises the steps of:
s10, sucking a water sample at a sampling point to a pipeline system by a sampling pump, communicating the sampling pump with an overflow box by an electromagnetic valve on the pipeline system, conveying the water sample to the outside of a metering cup of the overflow box in the initial stage of sampling, and conveying the water sample into the metering cup of the overflow box until the water sample overflows from the metering cup;
S20, after the sampling pump stops working, an electric control valve on an outlet of the measuring cup is opened, so that a water sample in the measuring cup flows into the mixing box;
s30, intermittently repeating the steps S10 to S20 for a plurality of times, wherein the repeated times are the times of the required segmented sampling in each sampling cycle;
s40, after the mixing box is filled with water samples for specified times, a control valve on an outlet of the mixing box is opened, part of the water samples in the mixing box are reserved in a specified sample reserving bottle through a sample reserving assembly, and then part of the water samples in the mixing box are pumped to on-line water quality analysis equipment through a sample supplying pump; if the subsequent water sample analysis result is qualified, rotating the corresponding sample reserving bottle to a sample reserving station and starting drainage, and if the subsequent water sample analysis result is out of standard, reserving the water sample in the corresponding sample reserving bottle;
s50, before the next sampling cycle, the sampling pump pumps a water sample at a sampling point to a pipeline system, the electromagnetic valve communicates the sampling pump with the mixing box, the water sample is driven by the sampling pump to flush the mixing box, the sample reserving assembly rotates a sample discharging bottle to the sample reserving station, the control valve is opened, so that clean water in the mixing box can be discharged to the outside through the sample discharging bottle, and the flushing process is maintained for a period of time;
S60, repeating the steps S10 to S50 until all the sample reserving bottles reserve water samples.
The fluid sampling method according to the inventive embodiment has at least the following beneficial effects:
1. in order to realize the discharge of the old water sample in the pipeline, the prior art with the peristaltic pump needs to discharge the old water sample to the outside through the inversion of the peristaltic pump, and the peristaltic pump is easily damaged due to overlarge pressure in the process, once the peristaltic pump is damaged, the water inlet system of the sampler can stop swinging, so that the sampler cannot work normally; in the invention, the quantitative sampling of the water sample is realized by arranging the measuring cup, so that the peristaltic pump is omitted, the sampling stability is improved, and in the step S10, the old water sample in the pipeline system is emptied because the water sample is not directly conveyed into the measuring cup of the overflow box in the initial stage of sampling, thereby avoiding cross contamination among different water samples;
2. the invention is provided with only one mixing box, so as to achieve the purposes of simplifying the pipeline structure, reducing the manufacturing cost and the like, and after each sampling cycle, the high water pressure of the sampling pump is utilized to realize the comprehensive flushing of the mixing box, thereby effectively avoiding the cross contamination among different water samples.
According to some embodiments of the invention, in step S10, the pipeline system discharges water into the measuring cup in a parabolic manner at the initial stage of sampling, the sampling pump works in a low-power state, so that the water pressure in the pipeline system is insufficient to convey the water sample into the measuring cup of the overflow box, and the sampling pump returns to a rated power state along with the gradual conveying of the water sample, so that the water pressure in the pipeline system is sufficient to convey the water sample into the measuring cup of the overflow box. Through the arrangement, the old water sample in the pipeline system can be effectively discharged to the outside, so that the normal use of the sampler can be maintained on the premise of omitting the peristaltic pump.
According to some embodiments of the invention, in step S10, the swing arm swings the water outlet of the pipeline system out of the measuring cup at the initial stage of sampling, and along with the gradual conveying of the water sample, the swing arm swings the water outlet of the pipeline system gradually above the measuring cup. Through the arrangement, the old water sample in the pipeline system can be effectively discharged to the outside, so that the normal use of the sampler can be maintained on the premise of omitting the peristaltic pump.
According to some embodiments of the present invention, in step S10, the sample reserving assembly rotates the sample discharging bottle to the sample reserving station, and the overflow box is communicated with the sample discharging bottle, so that the excess water sample in the overflow box can be discharged to the outside through the sample discharging bottle. Through foretell setting to realize the concentrated emission of waste water, the bar sample bottle does not be equipped with the valve, when having the water sample to get into its inside, the water sample can directly follow the bottom of bar sample bottle is discharged to the water catch bowl, by the water catch bowl is with the water sample water conservancy diversion to the blow off pipe.
According to some embodiments of the invention, the sample reserving assembly sets the position of the sample arranging bottle at the sample reserving station as a positioning origin, and the sample reserving assembly rotates back to the positioning origin every time the sample reserving bottle reserves a water sample so as to realize effective positioning of all sample reserving bottle positions, thereby simplifying the control program of a controller.
According to some embodiments of the invention, each sample retention bottle is assigned a different number, such as #1, #2, #3, #4, etc., and if the number of the currently used sample retention bottle is not more than half of the total number, the sample retention assembly performs a positive rotation during sample retention; if the number of the currently used sample reserving bottle exceeds half of the total number, the sample reserving assembly is reversed when the sample is reserved, so that the moving distance of the sample reserving assembly is reduced.
According to some embodiments of the present invention, in step S40, after the water sample in the mixing box is retained in the designated retention bottle by the retention assembly, the retention assembly empties the water sample in the retention bottle, and the water sample in the mixing box is retained in the retention bottle again. When the water sample analysis result is qualified, the corresponding sample reserving bottle needs to be rotated to the sample reserving station and drainage is started, so that part of old water sample can be remained in the sample reserving bottle, whether the sample reserving bottle is reused or not is required to be emptied and cleaned after the sample reserving bottle is injected into the water sample, and the water sample is reserved immediately so as to ensure the quality of the reserved water sample.
According to some embodiments of the invention, in step S50, the electromagnetic valve connects the sampling pump to the overflow tank while connecting the sampling pump to the mixing tank, and the water sample is simultaneously flushed out of the mixing tank and the measuring cup under the drive of the sampling pump, during which the electrically controlled valve is kept open. Through foretell setting, make the sample thief is at the in-process that washes, the blending box with the measuring cup all can obtain effectual washing, avoids cross contamination between the different water samples.
According to the sampler of the second aspect of the embodiment of the invention, by applying the fluid sampling method, the sampling pump is arranged close to a sampling point, the sampling pump is connected with the overflow box through the pipeline system, the metering cup is arranged in the overflow box, and the metering cup is connected with the mixing box through the electric control valve; the sample reserving assembly comprises a rotating mechanism, a lifting device, a sample reserving bottle and a plurality of sample reserving bottles, wherein the rotating mechanism drives the sample reserving bottles and the sample reserving bottles to rotate, the lifting device is provided with a vertical rod capable of lifting up and down, the upper end and the lower end of the vertical rod are respectively connected with a jacking column, the jacking columns at the upper end of the vertical rod are sample injecting nozzles, the sample injecting nozzles are respectively communicated with the mixing box and the overflow box, the top and the bottom of each sample reserving bottle are respectively provided with an elastic bottle stopper, the bottle mouth and the bottle bottom of each sample reserving bottle are respectively provided with a hole site, and the hole site of each sample reserving bottle and the elastic bottle stopper moving paths of all sample reserving bottles are all through the jacking columns.
According to some embodiments of the invention, the inner wall of the metering cup and/or the inner wall of the mixing box and/or the inner wall of the sample reserving bottle are/is adhered with the hydrophobic nano-paint, so that the residual quantity of the water sample and the suspended matters thereof adhered to the inner wall is reduced, and the flushing effect is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a front view of a sampler of an inventive embodiment of the present invention;
FIG. 2 is a front view of the sampler shown in FIG. 1 with the top cover removed;
FIG. 3 is a side view of the sampler shown in FIG. 2;
FIG. 4 is a top view of the sampler shown in FIG. 2;
FIG. 5 is a top view of an overflow tank of an inventive embodiment of the present invention;
FIG. 6 is a cross-sectional view of the overflow tank shown in FIG. 5 taken along section line A-A;
FIG. 7 is a schematic perspective view of a mixing box according to an embodiment of the present invention;
FIG. 8 is a schematic perspective view of a sample retention assembly according to an embodiment of the present invention;
fig. 9 is a schematic diagram showing a perspective structure of a sample retention assembly according to an embodiment of the present invention.
In the accompanying drawings: 100-cabinet, 200-sampling assembly, 300-water tank assembly, 500-sample retention assembly, 600-controller, 110-cabinet door, 111-electric control door lock, 120-working area, 130-storage area, 210-pipeline system, 220-overflow box, 230-measuring cup, 221-flow guide tube, 211-first water inlet tube, 212-baffle cover, 233-coaming, 231-magnet, 310-mixing box, 232-middle pipeline, 320-stirring mechanism, 301-cabinet, 302-baffle cover, 311-second water inlet tube, 312-second water drain tube, 430-control valve, 321-driving device, 322-belt transmission assembly, 501-rotating mechanism, 580-sample discharge bottle, 540-sample retention bottle, 510-rotating bracket, 520-bottom bracket, 530-rotating motor, 570-rotating shaft, 511-positioning hole, 521-water outlet, 550-switching mechanism, 541-elastic bottle plug, 551-lifting device, 552-connecting block, 553, 554-telescoping part, 555-top column, 556-filling nozzle, 581-hole site, 560-collecting tank, 420-electromagnetic valve, 700-electric control valve, 410-electromagnetic valve.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
In the description of the invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
As shown in fig. 1 to 4, the sampler according to the first aspect of the embodiment of the present invention includes a cabinet body 100, a sampling assembly 200, a water tank assembly 300, a distribution assembly, a sample reserving assembly 500 and a controller 600, wherein the cabinet body 100 is used as a housing of the sampler, a cavity is provided in the housing, a transparent cabinet door 110 is hinged to the front side surface of the cabinet body 100, and a power-off normally-closed type electric control door lock 111 is built in the cabinet door 110, so that remote control can be realized, and in use, the cabinet door 110 can completely isolate components in the cabinet body 100 from the outside. The cavity of the cabinet body 100 is sequentially divided into a working area 120 and a storage area 130 from top to bottom, a mixing box 310 is arranged between the working area 120 and the storage area 130, and the mixing box 310 can separate the working area 120 and the storage area 130 and can be pulled out from the cabinet body 100. With the exception of the sample retention assembly 500, almost all other assemblies and the controller 600 are disposed within the working area 120, and the storage area 130 has a built-in thermostat capable of maintaining the storage area 130 near a preset temperature range. The optimal preservation temperature of the water sample is 4 ℃, so the constant temperature of the constant temperature device is about 4 ℃.
Specifically, the sampling assembly 200 includes a sampling pump (not shown in the drawings), a sampling tube (not shown in the drawings), a pipe system 210 and an overflow tank 220, the sampling pump may be a self-priming pump, a water inlet portion and a water outlet portion of the sampling pump are respectively connected with the sampling tube and the pipe system 210, the sampling pump takes water from a sampling point through the sampling tube, and sends a water sample to the overflow tank 220 through the pipe system 210. It will be appreciated that the sampling point is typically located at the junction of the monitored enterprise sewage system, as a body of flowing water.
As shown in fig. 2, 5 and 6, in order to realize the function of quantitative sampling, the overflow tank 220 is provided with a metering cup 230, the volume of the metering cup 230 is relatively fixed, the metering cup 230 can be selected from 100ml, 200ml, 250ml and other specifications, once the metering cup 230 is filled with the water sample by the pipeline system 210, the volume of the water sample in the metering cup is equal to the rated volume of the metering cup 230, and the redundant water sample overflows from the metering cup 230 to the overflow tank 220 to replace the quantitative sampling function of the existing peristaltic pump. The bottom of the overflow box 220 is connected with a flow guiding pipe 221, and the flow guiding pipe 221 is used for guiding the redundant water sample in the overflow box 220 to the outside of the overflow box 220.
Since a part of the old water sample remains in the pipe system 210, the old water sample in the pipe system 210 is preferentially injected into the measuring cup 230 in the next sampling, and then cross-pollutes with the fresh water sample injected subsequently, thereby affecting the result of the online water quality analysis. In order to remove the influence of the old water sample, the pipe system 210 is provided with a first water inlet pipe 211 extending to the overflow box 220, the first water inlet pipe 211 is positioned above the measuring cup 230, and the water outlet of the first water inlet pipe 211 is spaced apart from the top surface of the measuring cup 230, so that the first water inlet pipe 211 can discharge water into the measuring cup 230 in a parabolic form. Since the first water inlet pipe 211 is located above the measuring cup 230, the water outlet path of the first water inlet pipe 211 is a parabolic descending path, but the specific position of the first water inlet pipe 211 is not limited in the invention, and the first water inlet pipe 211 may also be located below the measuring cup 230, and the water outlet path of the first water inlet pipe 211 is a parabolic path. At the beginning of sampling, the sampling pump is kept in a low power state to operate, so that the water pressure in the pipeline system 210 is insufficient to convey the water sample into the metering cup 230 of the overflow box 220, and the old water sample in the pipeline system 210 is conveyed out of the metering cup 230; with the progressive delivery of the water sample, the sampling pump returns to its rated power state, so that the water pressure in the pipe system 210 is sufficient to deliver the water sample into the metering cup 230 of the overflow box 220, thereby delivering fresh water sample into the metering cup 230, so as to avoid cross contamination between different water samples.
Further, in order to ensure that the first water inlet pipe 211 does not deliver the water sample into the measuring cup 230 at low water pressure, the water outlet of the first water inlet pipe 211 is hinged with a blocking cover 212, and the blocking cover 212 is hinged at the upper part of the water outlet. The rotating shaft of the baffle cover 212 is provided with a torsion spring, and the baffle cover 212 can keep the water outlet closed during the period of no water sample impulsive force under the elastic action of the torsion spring. When the water pressure in the first water inlet pipe 211 is insufficient to fully open the blocking cover 212, the blocking cover 212 is obliquely arranged at the water outlet, and at this time, the blocking cover 212 only opens the lower part of the water outlet, and the water sample flows out from the lower part of the water outlet and is guided to the periphery of the measuring cup 230 under the blocking of the blocking cover 212. Furthermore, since the blocking cover 212 can maintain the closure of the water outlet during the period in which the water sample is not fluctuated, the water sample in the first water inlet pipe 211 does not autonomously flow into the overflow box 220 when the sampling pump is not operated, so as to define a time point at which the water sample is discharged to the outside of the guide pipe 221. That is, the water outlet of the pipe system 210 to the overflow tank 220 is kept closed by the blocking cover 212 during the period of no impact of the water sample, so as to limit the time point when the overflow tank 220 discharges the water sample.
In addition, in order to overcome the technical problem that the first water inlet pipe 211 splashes the water sample out of the measuring cup 230 when the water pressure is high, a surrounding plate 233 is arranged at the top of the measuring cup 230, the top surface of the surrounding plate 233 is higher than the first water inlet pipe 211, and the surrounding plate 233 is provided with an opening in the direction facing the first water inlet pipe 211. When the water pressure in the first water inlet pipe 211 is enough to fully open the blocking cover 212, the first water inlet pipe 211 discharges water into the measuring cup 230 in a parabolic form, and most of the water sample which is splashed outside the measuring cup 230 can be blocked by the surrounding plate 233 and falls into the measuring cup 230 due to the surrounding plate 233.
In other embodiments, the pipe system 210 is provided with a first water inlet pipe 211 extending to the overflow tank 220, the first water inlet pipe 211 is a spring hose, and correspondingly, a swing arm (not shown in the drawings) driven by the steering engine is installed in the overflow tank 220, and the spring hose is wound on the swing arm. In the initial stage of sampling, the steering engine drives the swing arm to be far away from the metering cup 230, so that the water outlet of the spring hose is moved out of the metering cup 230, and the old water sample in the pipeline system 210 is conveyed out of the metering cup 230; along with the gradual conveying of the water samples, the steering engine gradually drives the swinging arm to be close to the metering cup 230, so that the water outlet of the spring hose is moved above the metering cup 230, and fresh water samples are conveyed into the metering cup 230, so that cross contamination among different water samples is avoided.
Further, in order to change the volume specification of the measuring cup 230, the measuring cup 230 may be made of steel, and although the volume of the measuring cup 230 is unchanged once the measuring cup 230 is made, the volume of the measuring cup 230 may be reduced to a specified value by attaching a magnet 231 of a specific specification to the inner wall of the measuring cup 230, for example, attaching a magnet 231 of a volume of 50ml to a measuring cup 230 of a volume specification of 200ml, so as to limit the volume of the measuring cup 230 to 150ml, thereby meeting different sampling requirements.
As shown in fig. 2 and 7, the water tank assembly 300 includes a mixing tank 310 and a stirring mechanism 320 disposed in the mixing tank 310, the mixing tank 310 is connected to the measuring cup 230 through an intermediate pipe 232, and the mixing tank 310 is directly connected to the pipe system 210. The mixing box 310 is optionally made of steel and comprises a box body 301 and a sealing cover 302, wherein the sealing cover 302 covers the open surface of the box body 301 so as to prevent water samples in the box body 301 from being sputtered out of the box body 301. The mixing box 310 is connected with two second water inlet pipes 311 on a sealing cover 302 thereof, the mixing box 310 is connected with a second water outlet pipe 312 on the bottom surface of a box body 301 thereof, the two second water inlet pipes 311 are respectively connected with the middle pipeline 232 and the pipeline system 210, the second water outlet pipe 312 is connected with a control valve 430, and the control valve 430 is also respectively connected with an online sample supply pipe and a sample reserving pipe.
Further, in order to sufficiently stir the water sample in the mixing tank 310 so as to prevent the suspended matters in the water sample from layering, two stirring blades (not shown in the drawing) are connected to the cover 302 of the mixing tank 310, and the two stirring blades extend toward the inner bottom surface of the tank 301. In order to simplify the structure and save the production cost, the two stirring blades can be driven by the same driving device 321, and the driving device 321 can be selected as a stirring motor, and the two stirring blades are driven simultaneously by a belt transmission assembly 322. The belt transmission assembly 322 comprises a driven gear, a driving gear and a triangle belt, wherein two stirring blades are connected with the driven gear outside the sealing cover 302, a main shaft of the stirring motor is connected with the driving gear, and the driving gear and the two driven gears synchronously transmit through the triangle belt, so that when the stirring motor is started, the two stirring blades can rotate simultaneously. It will be appreciated that the invention is not limited to a transmission of two stirring blades, which can also be controlled independently by means of a respective drive 321, or the number of stirring blades can be limited to one.
As shown in fig. 2, 8 and 9, the sample reserving assembly 500 includes a rotating mechanism 501, a sample discharging bottle 580 and a plurality of sample reserving bottles 540, the rotating mechanism 501 includes a rotating bracket 510, a bottom bracket 520 and a rotating motor 530, the bottom bracket 520 can be pulled out from the cabinet 100, the rotating bracket 510 and the bottom bracket 520 are rotationally connected through a rotating shaft 570, and the rotating motor 530 drives the rotating shaft 570 to rotate, so as to drive the rotating bracket 510 to rotate around the bottom bracket 520. A plurality of holding grooves are annularly arranged on the rotary bracket 510, each holding groove is used for holding the sample reserving bottle 540 or the sample discharging bottle 580, the bottom surface of each holding groove is provided with a positioning hole 511, the bottom support 520 is provided with a water outlet 521, the moving paths of all the positioning holes 511 pass through the water outlet 521, and at the moment, the position of the water outlet 521 is the sample reserving station of the sample reserving assembly 500. The rotating motor 530 is preferably a servo motor, as the present invention creates the technical requirements for the position of the sample retention bottle 540 and the sample discharge bottle 580.
It should be noted that, in order to distinguish the sample-reserving bottles 540, each sample-reserving bottle 540 has a different number, and in order to define placement of a plurality of sample-reserving bottles 540, each holding tank has the same number as the sample-reserving bottle 540, for example, the sample-reserving bottle 540 with the number #1 needs to be placed in the holding tank with the number # 1. The number of the stock bottle 580 is #0, and the number of the corresponding accommodating groove is #0.
Further, the sample discharging bottle 580 and each sample reserving bottle 540 are provided with different marks (not shown in the drawings) which can be read by a sensor (not shown in the drawings), and the sensor is arranged at the sample reserving station and can read all marks so that the controller 600 can learn the positions of the sample discharging bottle 580 and each sample reserving bottle 540, so as to accurately rotate the designated bottle to the sample reserving station. The sensor can be a proximity switch or a high-speed camera, when the sensor is a proximity switch, the mark is a metal bump combination, and when the sensor is a high-speed camera, the mark is a two-dimensional code or a bar code.
In other embodiments, instead of the sensor and the identifier, the position of the sample discharging bottle 580 at the sample reserving station may be set as the positioning origin of the sample reserving assembly 500, and each time the sample reserving bottle 540 is rotated to the sample reserving station, the sample reserving assembly 500 is rotated back to the positioning origin, so as to effectively position all the positions of the sample reserving bottles 540, thereby simplifying the control procedure of the controller 600. For example, the sample retention bottle 540 with the number #5 is separated from the layout bottle 580 by five rotation stations, and when the sample retention bottle 540 with the number #5 needs to be rotated to the sample retention station, the controller 600 only needs to send five rotation station instructions to the sample retention assembly 500 with the origin being positioned, so that the sample retention bottle 540 with the number #5 can be rotated to the sample retention station. In order to further reduce the moving distance of the sample reserving assembly 500, if the number of the currently used sample reserving bottle 540 is not more than half of the total number, the rotating motor 530 rotates forward during sample reserving; if the number of the currently used sample bottle 540 exceeds half of the total number, the rotating motor 530 is reversed when the sample is left.
As is well known, the sample retention bottle 540 is used for preserving a water sample with an out-of-standard water quality, so as to be used as a proof, and therefore, it needs to be preserved in a low-temperature environment, thereby inhibiting biochemical reaction of the water sample. Generally, law enforcement units need to extract a sample bottle 540 containing a water sample and replace it with a spare bottle, and once the spare bottle is lost or broken, the law enforcement units need to extract a part of the water sample in the sample bottle 540 and record it, and then empty and clean the sample bottle 540 to enable it to continue to be used. Alternatively, during commissioning of the device, the water sample in the sample retention bottle 540 needs to be emptied, or, after all the sample retention bottles 540 are filled with the water sample, the water sample in the sample retention bottle 540 needs to be emptied so as to be refilled with a new water sample. However, in order to drain the water sample from the sample retention bottle 540, the structure of the sample retention bottle 540 needs to be improved, and the switch mechanism 550 matched with the structure is designed.
Specifically, the top and bottom of each sample-reserving bottle 540 are provided with an elastic bottle plug 541, wherein the elastic bottle plug 541 located at the bottom of the sample-reserving bottle 540 passes through the corresponding positioning hole 511, so as to enhance positioning of the sample-reserving bottle 540. The elastic bottle plug 541 is configured such that the sample retention bottle 540 maintains a seal inside thereof without an external force applied thereto, so as to prevent the water sample in the sample retention bottle 540 from being contaminated by the internal environment of the storage area 130.
In addition, in order to fill or empty the sample bottle 540 at the sample station, the switch mechanism 550 includes a lifting device 551, a connection block 552, and a vertical rod 553, where the lifting device 551 is mounted on the base 520, and the lifting device 551 is disposed near the drain opening 521. The lifting device 551 may be a linear push rod, and is provided with a telescopic portion 554 that can extend and retract up and down, and the end of the telescopic portion 554 is connected with the upright rod 553 through the connection block 552, so that the lifting device 551 can drive the upright rod 553 to move up and down. The bottom of the upright rod 553 passes through the bottom support 520 and extends downwards, the upper end and the lower end of the upright rod 553 are both connected with a top column 555, the lifting path of the top column 555 at the lower end passes through the water outlet 521, and the moving path of the elastic bottle plug 541 of all sample-reserving bottles 540 passes through the top column 555. When the upright rod 553 ascends, the top column 555 at the lower end passes through the water outlet 521 and upwards pushes the elastic bottle plug 541 at the bottom of the sample reserving bottle 540, and at this time, the water sample in the sample reserving bottle 540 flows out of the sample reserving bottle 540 under the action of gravity; when the vertical rod 553 descends, the top column 555 at the upper end pushes down the elastic bottle plug 541 at the top of the sample reserving bottle 540, at this time, the top column 555 at the upper end is a sample injection nozzle 556, the sample injection nozzle 556 is respectively connected with the sample reserving pipe and the flow guiding pipe 221, and a flow sensor (not shown in the drawing) is arranged in the sample reserving pipe so as to realize quantitative sample injection of the sample reserving bottle 540 or the sample discharging bottle 580; when the upright rods 553 are positioned at the middle position, neither of the top posts 555 is in contact with the respective elastic bottle stopper 541, and the sample bottle 540 is in a standing state. In the above arrangement, since the two top posts 555 have a linkage relationship, the switch mechanism 550 can only perform sample injection or sample discharge on the sample bottle 540 at a time, which perfectly accords with the operation logic.
The structure of the sample discharging bottle 580 is simpler than that of the sample reserving bottle 540, the bottle mouth and the bottle bottom of the sample discharging bottle 580 are provided with hole sites 581, and as long as the sample filling nozzle 556 is used for filling samples into the top of the sample discharging bottle 580, water samples can be immediately discharged from the bottle bottom of the sample discharging bottle 580.
Further, a water collection tank 560 is provided at the bottom of the bottom bracket 520, and the notch of the water collection tank 560 corresponds to the water outlet 521 of the bottom bracket 520, so that the water sample in the sample reserving bottle 540 and the water sample in the sample discharging bottle 580 can be intensively discharged into the water collection tank 560, and the water collection tank 560 is communicated with the drain pipe, and the drain pipe extends to the sampling point, so that the water sample in the water collection tank 560 is refluxed to the sampling point.
As shown in fig. 1 to 3, the distribution assembly is used for realizing the communication or closing of the pipeline, and comprises an electromagnetic valve 410, an electric control valve 420 and a control valve 430, wherein the electromagnetic valve 410 is arranged in the pipeline system 210, and has a plurality of stations, namely a closing station for closing the overflow tank 220 and the mixing tank 310 to the pipeline system 210, a sampling station for communicating the overflow tank 220 to the pipeline system 210 and a flushing station for communicating the overflow tank 220 and the mixing tank 310 to the pipeline system 210. The electric control valve 420 is disposed in the middle pipeline 232 and has a plurality of stations, which are a sealing station for sealing the mixing box 310 in the middle pipeline 232 and a sampling station for communicating the mixing box 310 with the middle pipeline 232. The control valve 430 has a plurality of stations, which are a closing station for closing the sampling tube and the online sample supply tube to the second drain tube 312, a sample injection station for communicating the sampling tube to the second drain tube 312, a sample supply station for communicating the online sample supply tube to the second drain tube 312, and a back flushing station for communicating the online sample supply tube to the sampling tube. The electromagnetic valve 410, the electric control valve 420 and the control valve 430 are all electric valves, and all the three are controlled by the controller 600.
It is understood that the online sample supply pipe is communicated with an external online water quality analysis device (not shown in the drawing), and the online water quality analysis device is used for analyzing the content of pollutants such as COD, ammonia nitrogen, total phosphorus, total nitrogen and the like in the water sample. In order to remotely convey the water sample in the online sample supply pipe to the online water quality analysis equipment, a sample supply pump 700 is arranged on the online sample supply pipe.
In the present invention, since the number of the mixing boxes 310 is one, the on-line water quality analysis device may not complete the water quality analysis of the previous sampling cycle after the next sampling cycle is finished, and therefore the sample retention assembly 500 needs to frequently rotate the sample retention bottle 540, and the sample discharge bottle 580 is provided with a positioning origin for the sample retention assembly 500 in addition to being responsible for discharging the water sample, so as to effectively position all the positions of the sample retention bottle 540, thereby simplifying the control program of the controller 600, and avoiding the system confusion caused by rotating the wrong sample retention bottle 540 to the sample retention station by the sample retention assembly 500, so as to ensure the long-term stable operation of the sampler.
In some embodiments of the present invention, in order to reduce the residual amount of the water sample and the suspended matters thereof adhering to the inner wall, the inner wall of the measuring cup 230, the inner wall of the mixing box 310 and the inner wall of the sample retaining bottle 540 are all adhered with hydrophobic nano-paint, which is the prior art, and can form a coating film with a contact angle of more than 150 ° and a sliding angle of less than 20 ° on the surface of the object, so that the water sample and the suspended matters thereof are difficult to adhere to the inner wall thereof, thereby improving the washing effect. It is understood that the hydrophobic nano-paint may be provided only on the inner wall of the measuring cup 230, the inner wall of the mixing box 310, the inner wall of the sample-retaining bottle 540, or both, and is not limited to the above embodiments.
In some embodiments of the invention, in general, the monitored business is not authorized to open the cabinet door 110 in order to prevent the monitored business from replacing the water sample in the sample retention bottle 540. In order to ensure the reliability of the evidence, the sampler further comprises a monitoring system, and the monitoring system can record each opening and closing of the cabinet door 110 and upload the record to the cloud. If the monitoring system has an imaging function, unauthorized door opening actions can be imaged. In addition, the monitoring system can also record all human operations of the sampler and the occurrence time of the human operations so as to generate a record log and upload the record log to the cloud, thereby monitoring human intervention.
In some embodiments of the invention, the sampler further comprises a data processing system capable of processing and recording all data of the device. If the water sample collected from the period from 8 am to 9 am has the water quality exceeding the standard, the data system can record the sampling time and give the sampling time to the current number of sample reserving bottles 540, so that the law enforcement unit can find the specific sampling time of the number of sample reserving bottles 540 in the record so as to lock the evidence.
A fluid sampling method according to an embodiment of a second aspect of the present invention for creating the sampler according to the embodiment of the first aspect of the present invention includes the steps of:
s100, the sampling pump pumps the water sample at the sampling point to the pipeline system 210, the electromagnetic valve 410 on the pipeline system 210 is switched to a sampling station, the water sample is conveyed out of the metering cup 230 of the overflow box 220 at the initial stage of sampling, so that the old water sample in the pipeline system 210 is emptied, after the old water sample in the pipeline system 210 is conveyed, the water sample is conveyed into the metering cup 230 of the overflow box 220 immediately, so that the fresh water sample can be conveyed into the metering cup 230, and the sampling pump keeps working until the water sample overflows from the metering cup 230, so that the function of quantitative sampling is realized. In this process, the sample reserving assembly 500 is at the positioning origin, and the flow guide pipe 221 of the overflow box 220 is communicated with the sample injection nozzle 556 of the sample reserving assembly 500, so that the redundant water sample in the overflow box 220 can be injected into the sample discharge bottle 580 through the sample injection nozzle 556, and the redundant water sample flows back to the sampling point through the water collecting tank 560 and the drain pipe in sequence. Since the present invention creates a time point for discharging the water sample from the flow guide 221, it can be ensured that the sample discharge bottle 580 is always located at the sample retention station when the overflow box 220 stores the water sample, so as to prevent the water sample in the overflow box 220 from being inadvertently retained in the sample retention bottle 540.
S200, after the sampling pump stops working, the electric control valve 420 on the middle pipeline 232 is switched to a sampling station, so that the water sample in the metering cup 230 can flow into the mixing box 310 completely to realize one sampling of the whole sampling cycle, and after the electric control valve 420 is opened for a period of time, the controller 600 controls the electric control valve 420 to be switched to a closed station.
S300, because the water sample is required to be extracted periodically and quantitatively in each sampling cycle so as to meet the requirements of HJ353-2019 standard, the steps of the method need to intermittently repeat the steps S100 to S200 for a plurality of times, wherein the number of times of repetition is the number of times of sectional sampling required in each sampling cycle. Assuming that the time of each sampling cycle is one hour and the sample of the sample point is sampled every ten minutes, six samples are required in one sampling cycle, and the sample of water in the mixing box 310 is a mixture of multiple samples in one sampling cycle.
S400. after the mixing box 310 is filled with water samples for a specified number of times, the stirring motor drives the stirring blade to rotate so as to stir the mixed water samples in the mixing box 310, during which the sample reserving assembly 500 rotates the specified sample reserving bottle 540 to the sample reserving station, the control valve 430 is switched to the sample injecting station so that part of the water samples in the mixing box 310 are reserved in the specified sample reserving bottle 540 through the switching mechanism 550, each time the sample reserving bottle 540 reserves water samples, the sample reserving assembly 500 rotates back to the positioning origin, after which the control valve 430 is switched to the sample supplying station so that part of the water samples in the mixing box 310 are sent from the online sample supplying tube to the online water quality analyzing equipment through the sample supplying pump 700. If the subsequent water sample analysis result is qualified, the sample reserving assembly 500 rotates the corresponding sample reserving bottle 540 to the sample reserving station and starts drainage, and if the subsequent water sample analysis result is out of standard, the water sample in the corresponding sample reserving bottle 540 is reserved. Because the invention adopts a pre-retaining strategy for the water sample which is not analyzed, the all-weather uninterrupted automatic sampling of the sampler can be realized even if only one mixing box 310 is arranged, and the scientificity of sampling is deeply implemented. It will be appreciated that the remaining water sample in the mixing box 310 may be discharged to the outside through the discharge bottle 580 or may be entirely sent to the on-line water quality analysis device.
S500, before the next sampling cycle, the sampling pump sucks the water sample at the water taking point to the pipeline system 210, the electromagnetic valve 410 is switched to a flushing station, the water sample is driven by the sampling pump to flush the mixing box 310 and the metering cup 230 simultaneously, and during the period, the electric control valve 420 is kept at the sampling station. After a period of flushing, the control valve 430 is switched to the sample injection station, and since the sample reserving assembly 500 is at the positioning origin, the clean water in the mixing tank 310 can be discharged to the outside through the sample discharging bottle 580, so that the mixing tank 310 and the measuring cup 230 can be cleaned by the new water sample, so as to avoid cross contamination of the new water sample and the residual old water sample in the next sampling cycle. Because the inner walls of the metering cup 230 and the mixing box 310 are both adhered with the hydrophobic nano-paint, suspended matters in the water sample are difficult to adhere to the inner walls of the mixing box, and suspended matters on the inner walls can be effectively removed only by flushing, so that the requirement of law enforcement on thorough cleaning of the mixing box 310 is eliminated.
S600, repeating the steps S100 to S500 until all sample reserving bottles 540 reserve water samples or law enforcement units go to evidence taking.
It should be further noted that, in step S100, the sampling pump is operated in a low power state at the beginning of sampling, so that the water pressure in the pipe system 210 is insufficient to convey the water sample into the measuring cup 230 of the overflow box 220, thereby conveying the old water sample in the pipe system 210 out of the measuring cup 230; as the water sample is gradually delivered, the sampling pump gradually returns to the rated power state, so that the water pressure in the pipeline system 210 is enough to deliver the water sample into the metering cup 230 of the overflow box 220, and fresh water sample is delivered into the metering cup 230, so that cross contamination among different water samples is avoided.
Or, in the initial stage of sampling, the steering engine drives the swing arm to move the water outlet of the spring hose out of the metering cup 230, so that the old water sample in the pipeline system 210 is conveyed out of the metering cup 230; along with the gradual conveying of the water samples, the steering engine gradually drives the swinging arm to be close to the metering cup 230, so that the water outlet of the spring hose is moved above the metering cup 230, and fresh water samples are conveyed into the metering cup 230, so that cross contamination among different water samples is avoided.
It should be further noted that, in step S400, after the water sample in the mixing box 310 is retained in the designated retaining bottle 540 by the retaining assembly 500, the retaining assembly 500 empties the water sample in the retaining bottle 540, and the water sample in the mixing box 310 is retained in the retaining bottle 540 again. Because the corresponding sample-retaining bottle 540 needs to be rotated to the sample-retaining station and the drainage is started when the water sample analysis result is qualified, a part of old water sample remains in the sample-retaining bottle 540, and in order to avoid cross contamination between different water samples, no matter whether the sample-retaining bottle 540 is reused or not, the sample-retaining bottle 540 needs to be emptied and cleaned after being injected into the water sample, and then the water sample is retained, so that the quality of the retained water sample is ensured.
In addition, the old water sample inevitably remains in the online sample supply pipe, and when the sample supply pump 700 supplies the water sample to the online water quality analysis device, the new water sample and the old water sample are cross-contaminated, thereby causing deviation of the analysis result of the water sample. To overcome this problem, after the water sample in the mixing box 310 is retained to the designated sample retention bottle 540 by the sample retention assembly 500, the control valve 430 is switched to the back flushing station, the sample supply pump 700 is operated in reverse to drive the old water sample in the on-line sample supply tube to be retained to the sample retention bottle 540 by the sample retention tube, and then the sample retention assembly 500 empties the water sample in the sample retention bottle 540 so that the old water sample in the on-line sample supply tube can be discharged to the outside, and before the sample retention bottle 540 is refilled, the control valve 430 is switched to the sample filling station. That is, after the water sample in the mixing box 310 is retained to the designated retention bottle 540 by the retention assembly 500, the sample supply pump 700 is operated in reverse and retains the old water sample in the on-line sample supply tube to the retention bottle 540, and then the retention assembly 500 empties the water sample in the retention bottle 540.
In addition, since the sampler is networked with the law enforcement system, the law enforcement unit can learn about the sample retention condition of each sample retention bottle 540 of the sampler in the law enforcement system, and when 80% of the sample retention bottles 540 are filled with water samples, the sampler can automatically send evidence collection prompt to the law enforcement system. If law enforcement is unable to go to the evidence because of the unreliability, after all the sample bottles 540 are filled with water samples, the sample retention assembly 500 rotates the sample retention bottle 540 with the number #1 to the sample retention station, the lifting device 551 drives the upright column to lift up so as to jack up the elastic bottle plug 541 at the bottom of the sample retention bottle 540 on the station, thereby evacuating the water samples in the sample retention bottle 540, and after that, if new water samples are needed to be injected into other sample retention bottles 540, the sequentially numbered sample retention bottles 540 are sequentially drained, so that the timeliness of evidence is maintained.
By the sampling method, the invention realizes the uninterrupted automatic sampling of the sampling points all-weather under the premise of omitting a peristaltic pump, can effectively avoid cross contamination among different water samples, and is beneficial to improving the accuracy of the online water quality analysis result and the quality of the reserved water samples.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. A method of fluid sampling comprising the steps of:
s10, sucking a water sample at a sampling point to a pipeline system (210) by a sampling pump, communicating the sampling pump with an overflow box (220) by an electromagnetic valve (410) on the pipeline system (210), conveying the water sample to the outside of a metering cup (230) of the overflow box (220) at the initial stage of sampling, and conveying the water sample into the metering cup (230) of the overflow box (220) until the water sample overflows from the metering cup (230);
s20, after the sampling pump stops working, an electric control valve (420) on an outlet of the metering cup (230) is opened, so that a water sample in the metering cup (230) flows into the mixing box (310);
s30, intermittently repeating the steps S10 to S20 for a plurality of times, wherein the repeated times are the times of the required segmented sampling in each sampling cycle;
s40, after the mixing box (310) is filled with water samples with specified times, a control valve (430) on an outlet of the mixing box (310) is opened, part of the water samples in the mixing box (310) are reserved in a specified reserved sample bottle (540) through a reserved sample assembly (500), and then part of the water samples in the mixing box (310) are sent to on-line water quality analysis equipment through a sample supply pump (700); if the subsequent water sample analysis result is qualified, rotating the corresponding sample reserving bottle (540) to a sample reserving station and starting drainage, and if the subsequent water sample analysis result is out of standard, reserving the water sample in the corresponding sample reserving bottle (540);
S50, before the next sampling cycle, the sampling pump pumps a water sample at a sampling point to a pipeline system (210), the electromagnetic valve (410) communicates the sampling pump with the mixing box (310), the water sample is driven by the sampling pump to flush the mixing box (310), the sample reserving assembly (500) rotates a sample discharging bottle (580) to the sample reserving station, and the control valve (430) is opened, so that clean water in the mixing box (310) can be discharged to the outside through the sample discharging bottle (580);
s60, repeating the steps S10 to S50 until all the sample reserving bottles (540) reserve water samples.
2. The fluid sampling method of claim 1, wherein: in step S10, the pipe system (210) discharges water into the measuring cup (230) in a parabolic manner, and the sampling pump is operated in a low-power state at the initial stage of sampling, so that the water pressure in the pipe system (210) is insufficient to convey the water sample into the measuring cup (230) of the overflow tank (220), and the sampling pump is restored to a rated power state along with the gradual conveying of the water sample, so that the water pressure in the pipe system (210) is sufficient to convey the water sample into the measuring cup (230) of the overflow tank (220).
3. The fluid sampling method of claim 1, wherein: in step S10, at the initial stage of sampling, the swing arm swings the water outlet of the pipeline system (210) out of the measuring cup (230), and along with the gradual conveying of the water sample, the swing arm swings the water outlet of the pipeline system (210) gradually above the measuring cup (230).
4. The fluid sampling method of claim 1, wherein: in step S10, the sample reserving assembly (500) rotates the sample discharging bottle (580) to the sample reserving station, and the overflow box (220) is communicated with the sample discharging bottle (580), so that the redundant water sample in the overflow box (220) can be discharged to the outside through the sample discharging bottle (580).
5. The fluid sampling method of claim 1 or 4, wherein: the sample reserving assembly (500) sets the position of the sample arranging bottle (580) at the sample reserving station as a positioning origin, and the sample reserving assembly (500) rotates back to the positioning origin every time the sample reserving bottle (540) reserves a water sample.
6. The fluid sampling method of claim 5, wherein: each sample reserving bottle (540) is assigned a different number, and if the number of the currently used sample reserving bottle (540) is not more than half of the total number, the sample reserving assembly (500) performs forward rotation during sample reserving; if the number of the currently used sample reserving bottle (540) exceeds half of the total number, the sample reserving assembly (500) is reversed when reserving samples.
7. The fluid sampling method of claim 1, wherein: in step S40, after the water sample in the mixing box (310) is retained to the designated sample retaining bottle (540) through the sample retaining assembly (500), the sample retaining assembly (500) empties the water sample in the sample retaining bottle (540), and the water sample in the mixing box (310) is retained again in the sample retaining bottle (540).
8. The fluid sampling method of claim 1, wherein: in step S50, the electromagnetic valve (410) communicates the sampling pump with the mixing tank (310) and communicates the sampling pump with the overflow tank (220), and the water sample is driven by the sampling pump to simultaneously flush the mixing tank (310) and the metering cup (230), during which the electrically controlled valve (420) is kept open.
9. -a sampler, characterized in that a fluid sampling method according to any one of claims 1 to 8 is applied, said sampling pump being arranged close to a sampling point, said sampling pump being connected to said overflow tank (220) by means of said pipe system (210), said overflow tank (220) being provided with said measuring cup (230), said measuring cup (230) being connected to said mixing tank (310) by means of said electrically controlled valve (420); sample reserving assembly (500) is including rotary mechanism (501), elevating gear (551), stock bottle (580) and a plurality of stock bottle (540), rotary mechanism (501) drive stock bottle (580) and a plurality of stock bottle (540) rotate, elevating gear (551) are equipped with pole setting (553) that can reciprocate, the upper and lower both ends of pole setting (553) all are connected with jack-up post (555), are located jack-up post (555) of pole setting (553) upper end is annotate appearance mouth (556), annotate appearance mouth (556) communicate respectively in blending box (310) with overflow box (220), every the top and the bottom of stock bottle (540) all are equipped with elasticity bottle plug (541), hole site (581) have all been seted up at the bottleneck and the bottle bottom of stock bottle (580), hole site (581) of stock bottle (580) and elasticity bottle plug (541) of stock bottle (541) their travel path all pass through jack-up post (555).
10. The sampler according to claim 9, wherein: hydrophobic nano-paint is attached to the inner wall of the metering cup (230) and/or the inner wall of the mixing box (310) and/or the inner wall of the sample reserving bottle (540).
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| CN109781458A (en) * | 2019-03-18 | 2019-05-21 | 山东益源环保科技有限公司 | A kind of water quality, which is adopted, to keep sample equipment and its adopts the method for keeping sample |
| CN111426518A (en) * | 2020-06-10 | 2020-07-17 | 佛山市稚蒙环境科技有限公司 | Online fluid sampling device and sampling method |
| CN113504079A (en) * | 2021-06-02 | 2021-10-15 | 成都工业职业技术学院 | Sampling device and sampling method for food detection |
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