CN111426518A - Online fluid sampling device and sampling method - Google Patents
Online fluid sampling device and sampling method Download PDFInfo
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- CN111426518A CN111426518A CN202010520533.8A CN202010520533A CN111426518A CN 111426518 A CN111426518 A CN 111426518A CN 202010520533 A CN202010520533 A CN 202010520533A CN 111426518 A CN111426518 A CN 111426518A
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- 238000005070 sampling Methods 0.000 title claims abstract description 165
- 239000012530 fluid Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 90
- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
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- 238000002347 injection Methods 0.000 claims description 9
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- 238000005259 measurement Methods 0.000 abstract description 2
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- 238000003756 stirring Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
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- 230000002572 peristaltic effect Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
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- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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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
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Abstract
The invention discloses an online fluid sampling device and a sampling method, wherein the device comprises a constant temperature cabinet, a quantitative sampling mechanism, a sample mixing barrel and an automatic sample storage mechanism which are arranged in the constant temperature cabinet, and further comprises a sampling pump and a controller, the quantitative sampling mechanism comprises a quantitative cup which is arranged above the sample mixing barrel, the quantitative cup is communicated with the output end of the sampling pump, the bottom end of the quantitative cup is provided with an outlet, the outlet is communicated with the sample mixing barrel through a pipeline with an electric valve, the sample mixing barrel is respectively connected with an online analysis tester and the automatic sample storage mechanism through pipelines, and the controller is respectively electrically connected with the sampling pump, the quantitative sampling mechanism, the sample mixing barrel, the automatic sample storage mechanism and the online analysis tester; the sampling method comprises the steps of parameter setting, timing sampling, sample supplying, sample storing and sample processing. The online fluid sampling device provided by the invention has the advantages of simple structure and accurate measurement, can meet the requirement of high-frequency online sampling, supervises the discharge condition of enterprises in real time, and avoids the stealing discharge.
Description
Technical Field
The invention relates to the technical field of online monitoring, in particular to an online fluid sampling device and a sampling method.
Background
Along with the development of industry, water pollution is gradually serious, in order to monitor the pollution discharge of enterprises, governments push forward a water quality online monitoring system, an unattended real-time monitoring automatic water quality monitoring station is established to perform timing sampling detection on monitoring points, the analysis time of each index of the water quality detection is longer, the existing sampling time is usually once sampling within 2 hours, but the problem that the pollution discharge concentration is greatly changed and the representativeness of a sample is poor due to the long time interval between two hours, and in the sampling interval period, a monitored unit has the possibility of stealing and discharging by utilizing sampling gaps, therefore, the sampling frequency has to be increased, the samples within a unit time are combined and detected, so that the monitoring on the stealing and discharging of the enterprises is enhanced, and the difficulty of online analysis and detection is reduced.
In the high-frequency sampling process, the consistency of sampling quantity at each time needs to be ensured, and when the water quality exceeds the standard, the sample needs to be reserved again. In order to realize high-frequency sampling and sample retention, the conventional water quality sampler performs timing and quantitative sampling through a peristaltic pump, multiple samples in unit time are mixed through a sample mixing container, then sample liquid is conveyed to an online analysis tester, after online analysis results come out, whether the samples are retained or not is determined according to the results, because the sample analysis time is long, in the waiting process, in order to guarantee continuous sampling, the conventional water quality sampler is provided with two sample mixing containers, and the sampling process is alternately used, so that the requirements of waiting for analysis results and sampling are met. However, with the increasing of the analysis indexes, the requirement for the sample amount required by the online detection analyzer is larger and larger, under the condition that the internal space of the thermostatic cabinet is limited, the two sample mixing containers have very limited capacity, if the volume of the sample mixing container is to be increased, the volume of the thermostatic cabinet needs to be enlarged, so the cost is obviously increased, and the two mixing containers are used alternately, correspondingly, a pipeline for switching the sample mixing barrel needs to be arranged, so that the pipeline structure of the equipment is complex, the cost is increased, and errors are easy to occur.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an online fluid sampling device and a sampling method, and aims to overcome the defect that an online water quality sampler in the prior art is complex in structure and improve sampling precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an online fluid sampling device, wherein, the device includes constant temperature cabinet and sets up quantitative sampling mechanism, mixing appearance bucket, the automatic mechanism of depositing in constant temperature cabinet, the device still includes sampling pump and controller, quantitative sampling mechanism is including setting up the quantitative cup in mixing appearance bucket top, the output intercommunication of quantitative cup and sampling pump, the bottom of quantitative cup is equipped with the export, the export is through the pipeline intercommunication mixing appearance bucket that has the electric valve, mixing appearance bucket passes through the pipeline and connects online analysis tester and automatic mechanism of depositing respectively, the controller respectively with sampling pump, quantitative sampling mechanism, mixing appearance bucket, automatic mechanism of depositing and online analysis tester electric connection.
In the online fluid sampling device, a water tank is arranged outside the quantifying cup, the volume of the water tank is larger than that of the quantifying cup, and a drain pipe is arranged at the bottom of the water tank.
In the online fluid sampling device, the sample mixing barrel comprises a barrel body and a barrel cover arranged on the barrel body, a water inlet and a stirrer are arranged on the barrel cover, a water outlet is formed in the bottom of the barrel body, the water inlet of the sample mixing barrel is connected with a quantitative sampling mechanism through a pipeline, and the water outlet of the sample mixing barrel is connected with an online analysis tester and an automatic sample storage mechanism through a pipeline.
In the online fluid sampling device, the water outlet of the sample mixing barrel is sequentially connected with a metering pump and an electric three-way valve, and the output end of the electric three-way valve is respectively connected with an online analysis tester and an automatic sample storage mechanism through pipelines.
In the online fluid sampling device, the inner bottom surface of the barrel body is conical, a liquid outlet A is arranged at the lowest position of the inner bottom surface of the barrel body, and the liquid outlet A is connected with a liquid discharge pipe with a motor-operated switch valve.
Among the online fluid sampling device, automatic sample storage mechanism includes sample storage bottle, rotating bracket, rotating electrical machines and sample storage bottle switch module, the sample storage bottle sets up on rotating bracket, and the both ends of sample storage bottle all are equipped with the bottleneck of taking the elasticity bottle plug, rotating bracket is connected with the rotating electrical machines transmission, sample storage bottle switch module is used for letting out the appearance and annotating the appearance to the sample storage bottle.
In the online fluid sampling device, the sample storage bottle switch component comprises a vertical rod, a moving block and a push rod motor, the vertical rod is fixedly connected to the moving block, the moving block is in transmission connection with the push rod motor, top valves are arranged at the upper end and the lower end of the vertical rod, a sample injection pipe is arranged at the top valve at the upper end of the vertical rod, and the sample injection pipe is communicated with the sample mixing barrel.
In the online fluid sampling device, the device is also provided with a flushing pipe, the flushing pipe is provided with a switch valve, one end of the flushing pipe is communicated with the sampling pump, and the other end of the flushing pipe extends into the sample mixing barrel.
In the online fluid sampling device, the controller is provided with a control panel, the control panel is used for setting parameters, and the parameters comprise sampling frequency and time, sample mixing frequency and time, online sample sending amount and frequency, sample storage amount and frequency, and the temperature of the constant temperature cabinet.
An online fluid sampling method, wherein the method is performed using an online fluid sampling device as described above, the method comprising the steps of:
s1, setting sampling time and frequency of a quantitative sampling mechanism, setting sample mixing frequency and duration of a sample mixing barrel, and setting sample supply quantity and sample supply frequency of the sample mixing barrel to an online analysis tester and an automatic sample storage mechanism through a controller;
s2, sampling: the starting device is used for sampling by the quantitative sampling mechanism, conveying the sample to the sample mixing barrel according to the set sampling amount, and mixing after the sample in unit time is collected by the sample mixing barrel;
s3, inspection and sample storage: after the mixture is uniformly mixed, the sample mixing barrel supplies samples to the online analysis tester and the automatic sample storage mechanism according to the set sample supply amount; after the sample is supplied, the sample mixing barrel discharges sample liquid, and the sampling mechanism, the sample mixing barrel and the automatic sample storing mechanism repeat the steps S2 and S3 to perform continuous online sampling, sample supplying and sample storing;
s4, processing of a sample: the controller collects the detection results of the online analysis tester and compares the detection results, an instruction for reserving or discarding the sample is made according to the comparison results, and the automatic sample storage mechanism reserves or discards the sample according to the instruction.
Has the advantages that:
the invention provides an online fluid sampling device and a sampling method, wherein the fluid sampling device can complete the functions of online sample supply of an online analysis tester and storage of unqualified samples by arranging a quantitative sampling mechanism, a sample mixing barrel and an automatic sample storage mechanism. The quantitative cup has the characteristics of accurate measurement, low cost and difficult damage, and can be replaced according to actual needs; adopt single sample bucket that mixes to carry out sample many times of gathering in the unit interval and mix, need not to form a complete set and mix a sample bucket and switch the pipeline, not only simple structure is difficult for damaging to can also increase the capacity that mixes the sample bucket in finite space, satisfy the demand of high frequency online sampling, and to the demand of big sample volume when many indexes are analyzed and tested on line, be fit for using widely in the real-time supervision of water quality emission. Compared with the prior art, the method also has the following beneficial effects:
(1) the metering pump and the three-way valve arranged on the mixing barrel can input the sample liquid into the online analysis tester and the sample storage bottle in time, so that the sampling efficiency is improved;
(2) the bottle mouth and the elastic bottle plug arranged at the two ends of the sample storage bottle can discharge and inject samples under the condition that the direction of the bottle body is not changed, so that the utilization rate of the bottle body is improved;
(3) the arranged flushing pipe can flush the sample mixing barrel before each group of samples are sampled, so that the interference influence of the previous group of samples on the next group of samples is avoided, and the detection result is more real;
(4) the sampling method can realize high-frequency and high-capacity continuous sampling, thereby satisfying the real-time monitoring of the discharge condition of the monitoring point, improving the efficiency of water quality management and ensuring the water quality safety.
Drawings
Fig. 1 is a schematic structural view of an online fluid sampling apparatus provided by the present invention.
Fig. 2 is a schematic cross-sectional view of an in-line fluid sampler.
Fig. 3 is a schematic structural view of the rotary bracket and the rotary electric machine.
Fig. 4 is a schematic structural diagram of a sampling bottle.
Detailed Description
The present invention provides an online fluid sampling device and a sampling method, and in order to make the purpose, technical scheme and effect of the present invention clearer and clearer, the present invention is further described in detail below by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-4, the present invention provides an online fluid sampling device, which includes a constant temperature cabinet 1, a quantitative sampling mechanism 2, a sample mixing barrel 3, an automatic sample storage mechanism 4, and a sampling pump 5 disposed at a drainage outlet of an enterprise to be monitored. Sampling pump 5 can be self priming pump or immersible pump, and sampling pump 5's input sets up in treating monitoring point sewage department, and sampling pump 5's output and quantitative sampling mechanism 2 intercommunication. The constant temperature cabinet 1 is an internally closed cabinet body with a cabinet door (the cabinet door is not shown), and the temperature in the constant temperature cabinet can be kept between 0 and 4 ℃ so as to avoid sample deterioration. The quantitative sampling mechanism 2 is arranged above the sample mixing barrel 3 and is connected with the sample mixing barrel 3 through a pipeline. The sample mixing barrel 3 is respectively connected with an online analysis tester (not shown in the figure) and an automatic sample storage mechanism 4 through pipelines. Sampling pump 5 and quantitative sampling mechanism 2 are used for carrying out the high frequency time sample at regular time and quantity to fixed point monitoring point, mix appearance bucket 3 and be used for mixing the multiple sampling in the unit interval, automatic sample storage mechanism 4 is used for keeping a sample to the sample that does not reach standard and preserves. The online fluid sampling device with the structure can meet the requirements of high-frequency continuous sampling and online analysis and detection of multiple indexes and large sample amount, and can also meet the requirements of sample retention treatment on substandard samples, and has the characteristics of simple structure, low cost and high sampling precision.
As shown in fig. 1 and 2, in the above online fluid sampling device, the quantitative sampling mechanism 2 includes a quantitative cup 2.2, the quantitative cup 2.2 is a cup with a fixed volume, and the volume of the cup is customized according to the sampling volume requirement, and may be in the specifications of 100ml, 150ml, 200ml, 300ml, etc., but is not limited to the above specifications, the upper end of the quantitative cup 2.2 is open and is communicated with the output end of the sampling pump 5, the bottom end is provided with an outlet 2.21, and the outlet 2.21 is communicated with the mixing barrel 3 through a pipeline with an electric valve 2.22. The capacity of ration cup is exactly the single sampling volume, because the capacity of ration cup is certain, unnecessary sample liquid can overflow, consequently has the accurate effect of ration to the cost of ration cup is low, can not ruined, when the single sampling volume changes, only need change the corresponding volume the graduated flask can, be convenient for adjust.
As shown in fig. 1 and 2, in the quantitative sampling mechanism, a water tank 2.3 is further provided outside the quantitative cup 2.2, the volume of the water tank is larger than that of the quantitative cup, and a drain pipe 2.31 is provided at the bottom of the water tank 2.3. The water tank is used for collecting sample liquid overflowing from the quantitative cup to prevent the sample liquid from flowing to other places, and the drain pipe is used for discharging the sample liquid in the water tank. During operation, sampling pump 5 opens, motorised valve 2.22 at quantitative cup 2.2 exit closes simultaneously, sampling pump 5 will await measuring the sample liquid and take out to quantitative cup 2.2 in, the great volume that exceeds quantitative cup of the volume of sample liquid extraction is used for washing quantitative cup on the one hand, on the other hand guarantees that the sample liquid of quantitative cup is enough, at the in-process of sample, unnecessary sample liquid can spill over to basin 2.3 in from quantitative cup 2.2, discharge outside the constant temperature cabinet 1 through drain pipe 2.31, when sampling pump 5 stop work, motorised valve 2.22 is opened, quantitative cup 2.2 and blending tank 3 communicate, sample liquid flows into blending tank 3 under the action of gravity among the quantitative cup 2.2, accomplish a quantitative sampling.
As shown in fig. 1 and 2, in the online fluid sampling device, the sample mixing barrel 3 includes a barrel 3.1 for storing samples and a barrel cover 3.2 disposed on the barrel, the barrel may be a circular barrel or a square barrel, preferably a circular barrel, and because a single sample mixing barrel is used, the volume of the barrel is greatly increased compared with that of a double barrel in the prior art without changing the volume of the constant temperature cabinet, the volume is as high as 5 to 10L, which can meet the needs of multi-index online analysis and detection and sample retention, a water outlet 3.11 is disposed at the bottom of the barrel 3.1, the water outlet 3.11 is connected to an online analysis tester and an automatic sample storage mechanism through a pipeline, the barrel cover is provided with a water inlet 3.21 and a stirrer (including a stirring motor 3.22a and a stirring rod 3.22 b), the water inlet 3.21 is connected to an outlet 2.21 of a quantitative sampling mechanism through a pipeline, the sample liquid in a quantitative sampling cup enters the sample mixing barrel 3.21 through the water inlet, the stirrer includes a stirring motor 3.22a stirring rod 3.22a and a stirring rod 22b, when the sample liquid is uniformly mixed in the sample mixing barrel, the single stirring motor 22.2.2.2, the sample is used for a single-sample collection, and the sample mixing liquid is uniformly collected in the single-liquid collection tank, and the single-sampling device, and the single-sampling device is used for sampling device, and the single-sampling device is used for sampling device, when the single-sampling device is used for sampling device, the single-sampling device, the.
Preferably, as shown in fig. 1 and 2, the water outlet 3.11 of the sample mixing barrel 3 is further sequentially connected with a metering pump 3.3 and an electric three-way valve 3.4, and the output end of the electric three-way valve 3.4 is respectively connected with the online analysis tester and the automatic sample storage mechanism 4 through a pipeline. More preferably, the inner bottom surface of the sample mixing barrel is of a conical structure, a liquid discharge port A3.12 is arranged at the lowest position of the inner bottom surface, and the liquid discharge port A3.12 is connected with a liquid discharge pipe 3.5 with a motor-operated switch valve 3.6 and used for discharging redundant sample liquid out of the constant temperature cabinet.
During operation, when mixing appearance bucket 3 and accomplishing the many times sample of collection unit interval, and stir the back of mixing, measuring pump 3.3 is opened, electric switch valve 3.6 is closed this moment, electric three-way valve 3.4 intercommunication delivery port and online analysis tester, send the appearance to online analysis tester, wait for the appearance to supply to accomplish, electric three-way valve 3.4 intercommunication delivery port 3.11 and automatic sample storage mechanism 4, carry out the appearance, wait that the appearance is ended, electric three-way valve 3.4 and measuring pump 3.3 close, electric switch valve 3.6 is opened, remaining appearance liquid in staving 3.1 passes through the fluid-discharge tube and discharges.
Still further, the device still is equipped with flushing pipe 2.1, the flushing pipe is equipped with ooff valve 2.11, and the one end intercommunication sampling pump 5 of flushing pipe, the other end stretch into mix in the appearance bucket to be equipped with shower nozzle 2.12 at the tip, the shower nozzle is spherical shower nozzle, can spray comprehensively to mixing appearance bucket inner wall. The during operation, once send a kind back when the appearance bucket is accomplished to the muddy appearance, the whole discharges of appearance liquid in the appearance bucket will be mixed to the electric switch valve, when sampling pump 5 carries out next set of sampling, can wash muddy appearance bucket 3 earlier, specifically do: the sampling pump 5 is started to perform single-group first sampling, at the moment, the switch valve 2.11 and the electric switch valve 3.6 of the flushing pipe 2.1 are in an open state, the electric valve 2.22 and the electric three-way valve 3.4 are in a closed state, sample liquid at the output end of the sampling pump 5 is divided into two paths, one path of sample liquid is used for cleaning and sample supplying of the quantifying cup 2.2, the other path of sample liquid enters the sample mixing barrel 3 through the flushing pipe 2.1, the inner wall of the sample mixing barrel is flushed through the spray head, the flushed sample liquid can be discharged through the liquid discharge pipe 3.5, when the sample liquid is flushed for a certain time, the sampling pump 5 and the switch valve 2.11 are closed, the electric switch valve 3.6 is used for completely discharging flushing liquid in the sample mixing barrel, then the sample liquid is closed, then the electric valve 2.22 at the outlet of the quantifying cup 2.2 is opened, the sample liquid in the quantifying cup. It should be noted that the cleaning function of the flushing pipe on the sample mixing barrel is only performed during the first sampling in a single set of sampling; the on-off valve 2.11 is also an electrically controlled on-off valve.
Specifically, as shown in fig. 1, 2, 3 and 4, in the online fluid sampling device, the automatic sample storage mechanism 4 comprises a sample storage bottle 4.1, a rotary bracket 4.2, a rotary motor 4.3 and a sample storage bottle switch component, the rotating bracket 4.2 is provided with a plurality of mounting holes 4.21, the size of the mounting holes 4.21 is matched with that of the sample storage bottle 4.1, the number of the mounting holes 4.21 can be multiple, for example, 12 and 24 sample bottles are arranged according to actual requirements, the sample bottles 4.1 are fixed on the rotating bracket 4.2 through the mounting holes 4.21, the rotating bracket 4.2 is in transmission connection with a rotating motor 4.3, the rotating bracket is used for fixing and switching the sample storage bottle 4.1, the two ends of the sample bottle 4.1 are both provided with bottle openings 4.11 with elastic bottle stoppers 4.12, when no external force is applied, the elastic bottle stopper 4.12 props against the bottle mouth from the inside to ensure that the bottle mouth is in a sealing state, and when external force from outside to inside is applied, the bottle mouth is in an opening state; the sample storage bottle switch assembly is arranged beside the rotary tray, the position of the mounting hole opposite to the sample storage bottle switch assembly is a reference position 4.21a, and the sample storage bottle switch assembly is used for leaking and injecting samples of the sample storage bottle at the reference position; and a water receiving disc 4.9 is further arranged below the rotating motor and used for collecting sample liquid discharged when the sample bottle 4.1 discards the sample, and a liquid discharge port B4.91 is further arranged at the lower end of the water receiving disc and used for discharging water in the water receiving disc out of the constant temperature cabinet.
Specifically, as shown in fig. 1 and 2, in the automatic sample storage mechanism with the above structure, the sample storage bottle switch component includes a vertical rod 4.4, a moving block 4.5 and a push rod motor 4.6, the vertical rod 4.4 is fixedly connected to the moving block 4.5, the moving block 4.5 is in transmission connection with the push rod motor 4.6, top valves 4.7 are arranged at the upper and lower ends of the vertical rod 4.4, the top valves are just opposite to bottle openings at the upper and lower ends of the sample storage bottle, the distance between the top valves at the two ends of the vertical rod is greater than the height of the sample storage bottle, a sample injection pipe 4.8 is arranged at the top valve at the upper end of the vertical rod 4.4, and the sample injection pipe 4.8 is connected with an electric three. The push rod motor 4.6 drives the vertical rod 4.4 to move up and down, the up-down movement distance is that the top valve just pushes away the elastic bottle stopper in the bottle opening, and when the moving block 4.5 is in the middle position, the top valves 4.7 at the upper end and the lower end of the vertical rod 4.4 are not contacted with the sample bottle. During operation, push rod motor 4.6 upward movement earlier, make the overhead valve 4.7 of pole setting 4.4 bottom withstand the elasticity bottle plug of deposit appearance bottle lower extreme, make the liquid empty in the deposit appearance bottle, then push rod motor 4.6 downstream again, make the overhead valve on pole setting top push away the elasticity bottle plug downwards, make the bottleneck open, annotate the appearance pipe simultaneously and annotate the appearance to the deposit appearance bottle, treat to annotate the appearance and end the back, the push rod motor shifts up to finally stop in the intermediate position, the overhead valve at both ends all does not contact with the deposit appearance bottle about the pole setting this moment.
Preferably, as shown in fig. 1, the online fluid sampling device is further provided with a controller 6, the controller is disposed on the top surface of the thermostatic cabinet 1 and is electrically connected to the sampling pump 5, the switch valve, the electric valve, the stirrer, the metering pump, the electric three-way valve, the electric switch valve, the rotating motor 4.3, and the push rod motor 4.6, and is configured to control the sampling pump, the switch valve, the stirrer, the metering pump, the electric three-way valve, the electric switch valve, the rotating motor, and the push rod motor to be turned on and off, and the controller is further electrically connected to the online analysis tester and is configured to receive an online analysis detection result.
Further, the controller is provided with a control panel, the control panel is provided with a parameter setting button and is used for setting parameters such as sampling frequency and time, sample mixing time and frequency, online sample sending amount and sample sending frequency, sample storage amount and sample storage frequency and the temperature of the constant temperature cabinet, the sampling pump samples according to the sampling frequency, the stirrer performs sample mixing according to the sample mixing frequency and time, the metering pump sends samples to the online analysis tester according to the online sample sending amount and the sample sending frequency and conveys sample liquid to the sample storage bottle according to the sample storage amount, and the push rod motor performs up-and-down motion according to the sample storage amount and the sample storage frequency.
An online fluid sampling method, the method being performed using an online fluid sampling device as described above, the method comprising the steps of:
s1, placing a sampling bottle 4.1 on a rotary bracket 4.2, adjusting top valves 4.7 at the upper end and the lower end of an upright rod 4.4 to align the top valves to the sampling bottle at a reference position 4.21a, opening a switch valve, setting sampling time and frequency of a sampling pump through a control panel, setting opening and closing time and frequency of a switch valve of a flushing pipe, setting sample mixing time and frequency of a stirrer, setting sample supply amount and sample supply frequency of a metering pump 3.3 to an online analysis tester and sample storage amount and sample supply frequency, clicking to start, and starting an online fluid sampling device;
s2, timing sampling: the sampling pump 5 samples according to set time and frequency, when the sampling pump 5 works, the electric valve 2.22 at the outlet 2.21 of the quantitative bottle 2.2 is closed, and at the moment, redundant sample liquid overflows from the quantitative cup 2.2 to the water tank 2.3 and is discharged out of the constant temperature cabinet through the water outlet of the water tank 2.3, after the sampling of the sampling pump is finished, the electric valve 2.22 is opened, and the sample in the quantitative bottle 2.2 enters the sample mixing barrel; when a single group of samples are sampled for the first time, the inner wall of the sample mixing barrel can be flushed in advance by the flushing pipe;
s3, mixing a sample by a sample mixing barrel: the stirrer stirs and mixes the liquid for the sample in the sample mixing barrel according to the set stirring frequency;
s4, inspection: after the sample mixing is finished, the metering pump 3.3 is started, the electric three-way valve 3.4 is opened at the same time, the electric three-way valve 3.4 is communicated with the online analysis tester, the metering pump supplies samples to the online analysis tester according to the set sample feeding amount, and the electric switch valve 3.6 is in a closed state at the moment;
s5, sample storage and water injection: after sample supply is finished, the electric three-way valve 3.4 is communicated with the automatic sample storage mechanism, the push rod motor 4.6 firstly moves upwards to enable the top valve 4.7 at the bottom end of the vertical rod 4.4 to jack the elastic bottle plug at the lower end of the sample storage bottle 4.1, the sample storage bottle is emptied, then the push rod motor 4.6 moves downwards to enable the top valve at the top end of the vertical rod 4.4 to be aligned with the elastic valve at the top bottle opening of the sample storage bottle to be pressed downwards, and a sample is injected into the sample storage bottle according to the set sample storage amount;
s6, discarding the sample by a sample mixing barrel: after the sample storage and water injection are finished, the metering pump 3.3 is closed, the electric switch valve 3.6 is opened, the sample liquid in the sample mixing barrel 3 is discharged through the liquid discharge pipe, after the liquid discharge is finished, the electric switch valve is closed, the quantitative sample mixing barrel and the mechanism are adopted, the steps S2, S3, S4 and S5 are repeated, and continuous online sampling is carried out;
step S7, sample discarding treatment: when the detection result of the online analysis tester is sent to the controller, the controller compares the detection result, when the detection result of the sample meets the standard requirement, the sample in the sample storage bottle 4.1 is discarded, the controller sends a sample discarding instruction to the push rod motor 4.7, the push rod motor 4.7 drives the moving block to move upwards, the top valve at the lower end of the vertical rod is aligned with the spring valve at the lower end of the sample storage bottle to lift upwards, the spring valve is opened, and the sample in the sample storage bottle flows out from the bottle opening at the bottom end;
s8, sample storage and reservation: when the detection result detected by the on-line analysis tester does not meet the standard requirement, sample reserving processing is carried out, and the controller 6 sends a rotation instruction to the rotating motor to enable the next sample storage bottle 4.1 to rotate to the reference position;
and S9, repeating the steps until the rotating motor rotates for 360 degrees, and stopping the rotation, so that the sample injection of all the sample storage bottles is completed.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. The utility model provides an online fluid sampling device, its characterized in that, the device includes constant temperature cabinet and sets up quantitative sampling mechanism, the sample mixing bucket, the automatic mechanism of depositing in constant temperature cabinet, the device still includes sampling pump and controller, quantitative sampling mechanism is including setting up the quantitative cup in sample mixing bucket top, the output intercommunication of quantitative cup and sampling pump, the bottom of quantitative cup is equipped with the export, the export is through the pipeline intercommunication sample mixing bucket that has the electric valve, sample mixing bucket passes through the pipeline and connects online analysis tester and automatic mechanism of depositing respectively, the controller respectively with sampling pump, quantitative sampling mechanism, sample mixing bucket, automatic mechanism of depositing and online analysis tester electric connection.
2. The on-line fluid sampling device of claim 1, wherein a water tank is further disposed outside the dosing cup, the volume of the water tank is larger than that of the dosing cup, and a drain pipe is disposed at the bottom of the water tank.
3. The on-line fluid sampling device of claim 1, wherein the sample mixing barrel comprises a barrel body and a barrel cover arranged on the barrel body, a water inlet and a stirrer are arranged on the barrel cover, a water outlet is arranged at the bottom of the barrel body, the water inlet of the sample mixing barrel is connected with the quantitative sampling mechanism through a pipeline, and the water outlet of the sample mixing barrel is connected with the on-line analysis tester and the automatic sample storage mechanism through a pipeline.
4. The on-line fluid sampling device of claim 3, wherein the water outlet of the sample mixing barrel is further connected with a metering pump and an electric three-way valve in sequence, and the output end of the electric three-way valve is respectively connected with the on-line analysis tester and the automatic sample storage mechanism through pipelines.
5. The on-line fluid sampling device of claim 3, wherein the inner bottom surface of the barrel body is conical, the lowest part of the inner bottom surface of the barrel body is provided with a liquid outlet A, and the liquid outlet A is connected with a liquid outlet pipe with a power-operated switch valve.
6. The on-line fluid sampling device of claim 1, wherein the automatic sample storage mechanism comprises a sample storage bottle, a rotary tray, a rotary motor and a sample storage bottle switch assembly, the sample storage bottle is arranged on the rotary tray, bottle openings with elastic bottle stoppers are arranged at two ends of the sample storage bottle, the rotary tray is in transmission connection with the rotary motor, and the sample storage bottle switch assembly is used for draining and filling the sample storage bottle.
7. The on-line fluid sampling device of claim 6, wherein the sample bottle switch assembly comprises an upright rod, a moving block and a push rod motor, the upright rod is fixedly connected to the moving block, the moving block is in transmission connection with the push rod motor, top valves are arranged at the upper end and the lower end of the upright rod, a sample injection pipe is arranged at the top valve at the upper end of the upright rod, and the sample injection pipe is communicated with the sample mixing barrel.
8. The on-line fluid sampling device of claim 1, wherein the device is further provided with a flushing pipe, the flushing pipe is provided with a switch valve, one end of the flushing pipe is communicated with the sampling pump, and the other end of the flushing pipe extends into the sample mixing barrel.
9. The online fluid sampling device of claim 1, wherein the controller is provided with a control panel for setting parameters including sampling frequency and time, sample mixing frequency and time, online sample sending amount and frequency, sample storing amount and frequency, and temperature of the thermostatic cabinet.
10. A method of online fluid sampling, wherein the method is performed using the online fluid sampling apparatus of any of claims 1-9, the method comprising the steps of:
s1, setting sampling time and frequency of a quantitative sampling mechanism, setting sample mixing frequency and duration of a sample mixing barrel, and setting sample supply quantity and sample supply frequency of the sample mixing barrel to an online analysis tester and an automatic sample storage mechanism through a controller;
s2, sampling: the device is started, the quantitative sampling mechanism samples and quantitatively conveys the collected samples to the sample mixing barrel, and the samples are mixed after the sample mixing barrel collects the samples in unit time;
s3, sample sending and storing: after the samples are uniformly mixed, the sample mixing barrel supplies samples to the online analysis tester and the automatic sample storage mechanism according to the set sample supply amount; after the sample is supplied, the sample mixing barrel discharges sample liquid, and the sampling mechanism, the sample mixing barrel and the automatic sample storing mechanism repeat the steps S2 and S3 to perform continuous online sampling, sample supplying and sample storing;
s4, processing of a sample: the controller collects the detection results of the online analysis tester and compares the detection results, an instruction for reserving or discarding the sample is made according to the comparison results, and the automatic sample storage mechanism reserves or discards the sample according to the instruction.
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| CN112557161A (en) * | 2020-12-08 | 2021-03-26 | 山东泓盛智能科技有限公司 | Gravity type material multiple sample mixing device and sample mixing method thereof |
| CN113567189A (en) * | 2021-08-09 | 2021-10-29 | 重庆市三峡鱼复排水有限责任公司 | Sample reserving device and method for water quality sampling system |
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