CN211477748U - Water quality sampling unit capable of accurately metering - Google Patents
Water quality sampling unit capable of accurately metering Download PDFInfo
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- CN211477748U CN211477748U CN201922489600.XU CN201922489600U CN211477748U CN 211477748 U CN211477748 U CN 211477748U CN 201922489600 U CN201922489600 U CN 201922489600U CN 211477748 U CN211477748 U CN 211477748U
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Abstract
The utility model provides a quality of water sampling unit that can carry out accurate measurement, include the sampling unit that links to each other with the water sample through pipeline before the pump, the sampling unit passes through behind the pump pipeline and links to each other with quality of water buffer unit, quality of water buffer unit links to each other with sampling distribution unit through the pipeline level sensor who sets up on the pipeline, sampling distribution unit links to each other with a plurality of pipelines that are equipped with pipeline level sensor on it, every pipeline terminal links to each other with a quality of water sampling terminal respectively, during the measurement of sampling flow volume control through setting up, adopt the control mode of closed loop, sampling peristaltic pump is when sampling control unit control measurement number of turns promptly, through three pipeline level sensor's real-time feedback, obtain the error of actual flow volume, and calculate in real time through sampling control unit, the adjustment, revise the flow volume of sampling peristaltic pump's the number. The interference caused by external disturbance or system internal change is avoided, the control precision is higher, and the sampling and metering are more accurate.
Description
The technical field is as follows:
the utility model relates to a quality of water sampling unit that can carry out accurate measurement.
Background art:
the water quality sampling unit is one of the most important links of the automatic water quality sampler, and along with the increasing standard requirements of the state on the water quality environment, the sampling unit with accurate measurement is more and more important, and the error of sampling measurement can cause the integral error of water quality analysis, thereby causing the deviation of the whole analysis numerical value. Most quality of water sampling unit is the peristaltic pump sampling at present, and the peristaltic pump has advantages such as the structure is reliable, control is simple, but along with the wearing and tearing of pump line, the peristaltic pump rotates the water intake error of single circle and can grow, and gathers a certain amount of water sample peristaltic pump and need rotate thousands of commentaries on classics or even tens of thousands of commentaries on classics, and the accumulative error can become very big, causes the inaccurate of sampling volume measurement.
At present some sampling units can install pipeline level sensor 4 additional in order to improve the accuracy of sampling volume, but this sensor is in the use, and remaining water droplet and the water column of discontinuity on some pipe walls can paste the pipe wall and remove when the operation of pump, and the water droplet on these pipe walls and the water column of discontinuity are responded to by level sensor and can be misjudged as the water sample and have arrived appointed position, cause the error of the measurement of sampling volume.
In addition, the control mode of the existing water quality sampling unit is too simple, the existing water quality sampling unit is mostly in an open-loop control mode, and the measurement deviation can be brought by external disturbance or interference caused by internal change of a system.
The superposition of the problems can cause the metering error of the sampling quantity to become very large, and some sampling quantities even exceed the minimum standard of 10 percent of the environmental standard, so that the invention of the effective high-precision water quality sampling unit is particularly important.
The utility model has the following contents:
the utility model provides a water quality sampling unit capable of accurately metering, which not only can effectively filter out water drops remained on the pipe wall, but also avoids the interference caused by external disturbance or system internal change, and the sampling and metering are also accurate; and by adopting a closed-loop control mode, the control precision is higher, and the problems in the prior art are solved.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
the utility model provides a quality of water sampling unit that can carry out accurate measurement, include the sampling unit that links to each other with the water sample through pipeline before the pump, the sampling unit passes through behind the pump pipeline and links to each other with quality of water buffer unit, quality of water buffer unit links to each other with sampling distribution unit through the pipeline level sensor who sets up on the pipeline, sampling distribution unit links to each other with a plurality of pipelines that are equipped with pipeline level sensor on it, every pipeline terminal links to each other with a quality of water sampling terminal respectively, the sampling unit, sampling distribution unit and pipeline level sensor link to each other with sampling control unit through signal of telecommunication or radio signal respectively, sampling control unit links to each other with the power electricity.
The sampling unit is a peristaltic pump capable of controlling the rotating speed.
The water quality buffer unit comprises a hollow shell with an opening at the front end, and an end cover is movably arranged at the opening; the end cover is provided with a connector connected with a pipeline behind the pump, the rear end of the shell is provided with a connector connected with the pipeline, and an end cover sealing ring is arranged at the sealing position of the end cover and the shell.
A filter screen with the filtering direction opposite to the water inlet direction is arranged in the shell, and a filter screen sealing ring is arranged at the contact part of the filter screen and the inner side wall of the shell.
The inner diameter of the housing should be greater than the inner diameter of the pipe.
The inner diameter of the shell is 2 times of the inner diameter of the pipeline.
The sampling distribution unit samples the electric three-way ball valve.
The water quality sampling terminal is a sampling barrel made of inert materials.
The pipeline liquid level sensor is a non-contact liquid level sensor.
The pipeline behind the pump and the pipeline between the water quality buffer unit and the sampling distribution unit are arranged perpendicular to the horizontal plane in the pipeline.
The above structure is adopted in the utility model, novel structure, reasonable in design, the water droplet on remaining pipe wall can effectually be filtered to the quality of water buffer unit through setting up, prevents that the water droplet in the pipeline or the water column that is interrupted before not forming continuous incessant rivers, when passing through pipeline level sensor, pipeline level sensor senses the water droplet or the water column that is interrupted and begins to measure the metering error that sampling flow volume caused. In addition, when the measurement is controlled through the set sampling flow volume, a closed-loop control mode is adopted, namely the sampling peristaltic pump obtains the error of the actual flow volume through the real-time feedback of the three pipeline liquid level sensors while the sampling control unit controls the number of the measurement turns, and the sampling flow volume is modified through the real-time calculation, adjustment and correction of the number of the rotation turns of the sampling peristaltic pump by the sampling control unit. The interference caused by external disturbance or system internal change is avoided, the control precision is higher, and the sampling and metering are more accurate.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a sectional structure of the middle water quality buffer unit of the present invention.
In the figure, 1, a pipeline before a pump, 2, a pipeline after the pump, 3, a water quality buffer unit, 4, a pipeline liquid level sensor, 5, a pipeline, 6, a peristaltic pump, 7, a shell, 8, an end cover, 9, a connector, 10, an end cover sealing ring, 11, a filter screen, 12, a filter screen sealing ring, 13, an electric three-way ball valve, 14 and a sampling barrel.
The specific implementation mode is as follows:
in order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.
As shown in the figures 1-2, a water quality sampling unit capable of carrying out accurate metering comprises a sampling unit connected with a water source through a pipeline 1 in front of a pump, the sampling unit is connected with a water quality cache unit 3 through a pipeline 2 behind the pump, the water quality cache unit 3 is connected with a sampling distribution unit through a pipeline liquid level sensor 4 arranged on a pipeline 5, the sampling distribution unit is connected with a plurality of pipelines 5 provided with the pipeline liquid level sensors 4, each pipeline 5 terminal is respectively connected with a water quality sampling terminal, the sampling unit, the sampling distribution unit and the pipeline liquid level sensor 4 are respectively connected with a sampling control unit through electric signals or wireless signals, and the sampling control unit is electrically connected with a power supply. The sampling control unit is an AWS-I sampling controller or a sampling controller purchased from the market and having similar functional structure.
The sampling unit is a peristaltic pump 6 capable of controlling the rotating speed; is the power source of the whole sampling unit and is used for pumping water samples.
The water quality buffer unit 3 comprises a hollow shell 7 with an opening at the front end, and an end cover 8 is movably arranged at the opening; the end cover 8 is provided with a connector 9 connected with the pump rear pipeline 2, the rear end of the shell 7 is provided with a connector 9 connected with the pipeline 5, and an end cover sealing ring 10 is arranged at the sealing position of the end cover 8 and the shell 7. A filter screen 11 with the filtering direction opposite to the water inlet direction is arranged in the shell 7, and a filter screen sealing ring 12 is arranged at the contact part of the filter screen 11 and the inner side wall of the shell 7. The inner diameter of the housing 7 should be larger than the inner diameter of the pipe 5. The inner diameter of the housing 7 is 2 times the inner diameter of the pipe 5.
The shell 7 is a main body structure of the water quality caching unit 3 and is used for caching the water sample collected by the sampling peristaltic pump 6; and can filter the water quality with larger particles. The end cover 8 and the shell are in a connection structure which can be quickly disassembled in a threaded or other mode; an end cover sealing ring 10 is arranged on the end face of the end cover 8 and used for sealing the water quality caching unit 3 into a cavity which can not leak water; and the end cover 8 is a detachable structure and can be used for assembling and disassembling the filter screen 11 and cleaning the inner hole of the shell 7 and the filter screen 11. The filter screen 11 has a matching function and is used for filtering water with larger particles in the water; a filter screen sealing ring 12 is arranged at the shaft end of the filter screen 11 and is used for isolating filtered water from unfiltered water; meanwhile, the filter screen 11 is of a detachable structure, so that the filter screen 11 is convenient to clean and replace.
The sampling distribution unit samples the electric three-way ball valve 13. For distributing the collected water samples to a plurality of water quality sampling tanks 14. The electric three-way ball valve 13 is of an electric control structure and is controlled by a sampling control unit, and the collected water sample is distributed to a plurality of water quality sampling barrels 14, so that non-interval sampling is realized. The water sampling terminal is a sampling barrel 14 made of inert materials and does not react with substances in a water sample.
The pipeline liquid level sensor 4 is a non-contact liquid level sensor. Fix on pipeline 5 outer wall for it has liquid to flow through in the detection pipeline 5, can send signal transmission to sampling control unit after detecting liquid and flow through, wherein pipeline level sensor 4 is the pipeline level sensor 4 that sensitivity is adjustable, can adjust different sensitivities according to pipeline 5 internal diameter and wall thickness of difference, in order to be used for the sensitive flow through that detects liquid in the pipeline 5. And the pipeline liquid level sensor 4 is fixed on the outer wall of the pipeline 5, is close to the sampling barrel 14, is used for detecting whether liquid flows into the water quality sampling barrel 14 or not, and simultaneously sends a signal to the sampling control unit.
The pipeline 2 behind the pump and the pipeline between the water quality buffer unit 3 and the sampling distribution unit are arranged vertical to the horizontal plane in the pipeline 5.
In the working process: the water sample gathered by the sampling peristaltic pump 6 enters the water quality buffer unit 3 through the pipeline 2 behind the pump, because the internal diameter of the water quality buffer unit 3 is larger than the internal diameter of the pipeline 5, the water sample can enter the pipeline 5 at the rear end of the water quality buffer unit 3 after being filled with the water sample 3, the water quality buffer unit 3 has the function of water sample buffer, the residual water drops in the pipeline 5 before the water quality buffer unit 3 can be temporarily stored in the water quality buffer unit 3, the water sample can enter the pipeline 5 at the rear end of the water quality buffer unit 3 after the water quality buffer unit 3 is fully filled by the water sample buffer unit, so as to reduce the flow of the water drops attached to the pipe wall in the pipeline 5, the interference to the pipeline liquid level sensor 4 between the water quality buffer unit 3 and the sampling distribution unit is caused, and the error of water sample collection. Meanwhile, due to the limitation of the structure of the peristaltic pump 6, the water quality buffer unit 3 can filter bubbles generated by the sampling peristaltic pump 6 in the operation process, so that a water sample in the pipeline 5 behind the water quality buffer unit 3 is a continuous water sample without bubbles, and the bubbles in the water sample can be more accurately measured compared with the bubbles in the water sample.
The water sample entering the pipeline 5 at the rear end of the water quality buffer unit 3 through the water quality buffer unit 3 is continuous liquid without air bubbles. When a water sample passes through the pipeline liquid level sensor 4 positioned between the water quality buffer unit 3 and the sampling distribution unit, the water sample is sensed by the pipeline liquid level sensor and sends a signal to the sampling control unit, and the sampling control unit starts timing and counting. The flow volume of one turn of the sampling peristaltic pump 6 in the same time period is fixed, and the flow volume of the sampling can be controlled by controlling the number of turns of the sampling peristaltic pump 6 so as to achieve the purpose of quantitative sampling.
The water inlet of each water quality sampling barrel 14 is respectively provided with a pipeline liquid level sensor 4, the pipeline liquid level sensors 4 distributed at the water inlet of the water quality sampling barrel 14 and the pipeline liquid level sensors 4 positioned between the water quality cache unit 3 and the sampling distribution unit form closed-loop control, after a water sample flows through the pipeline liquid level sensors 4 positioned between the water quality cache unit 3 and the sampling distribution unit, the pipeline liquid level sensors 4 send signals to the sampling control unit, the sampling control unit starts to time, when the water sample respectively passes through the pipeline liquid level sensors distributed at the water inlet of the water quality sampling barrel 14, the pipeline liquid level sensors 4 also send signals to the sampling control unit, the sampling control unit times again, the middle time difference can feed back the running condition of the sampling peristaltic pump 6, and the error of sampling flow volume caused by the abrasion of a pump pipe of the peristaltic pump 6 or other pipeline problems is prevented, the sampling control unit calculates the difference between the real-time difference and the preset standard time difference in real time, and adjusts the number of rotation turns of the sampling peristaltic pump 6 to correct the error of the sampling flow volume. By a closed-loop control mode and feedback of a plurality of pipeline liquid level sensors 4, the maximization of the sampling flow volume measurement standard is achieved.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (10)
1. The utility model provides a can carry out water sampling unit of accurate measurement which characterized in that: including the sampling unit who links to each other with the water sample through pipeline before the pump, the sampling unit passes through behind the pump pipeline and links to each other with quality of water buffer unit, quality of water buffer unit links to each other with sampling distribution unit through the pipeline level sensor who sets up on the pipeline, sampling distribution unit links to each other with a plurality of pipelines that are equipped with pipeline level sensor on it, every pipeline terminal links to each other with a quality of water sampling terminal respectively, the sampling unit, sampling distribution unit and pipeline level sensor link to each other with sampling control unit through signal of telecommunication or radio signal respectively, sampling control unit links to each other with the power electricity.
2. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the sampling unit is a peristaltic pump capable of controlling the rotating speed.
3. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the water quality buffer unit comprises a hollow shell with an opening at the front end, and an end cover is movably arranged at the opening; the end cover is provided with a connector connected with a pipeline behind the pump, the rear end of the shell is provided with a connector connected with the pipeline, and an end cover sealing ring is arranged at the sealing position of the end cover and the shell.
4. The water quality sampling unit capable of carrying out accurate metering according to claim 3, characterized in that: a filter screen with the filtering direction opposite to the water inlet direction is arranged in the shell, and a filter screen sealing ring is arranged at the contact part of the filter screen and the inner side wall of the shell.
5. A water quality sampling unit capable of carrying out accurate measurement according to claim 3 or 4, characterized in that: the inner diameter of the housing should be greater than the inner diameter of the pipe.
6. The water quality sampling unit capable of carrying out accurate metering according to claim 5, characterized in that: the inner diameter of the shell is 2 times of the inner diameter of the pipeline.
7. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the sampling distribution unit samples the electric three-way ball valve.
8. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the water quality sampling terminal is a sampling barrel made of inert materials.
9. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the pipeline liquid level sensor is a non-contact liquid level sensor.
10. The water quality sampling unit capable of carrying out accurate metering according to claim 1, characterized in that: the pipeline behind the pump and the pipeline between the water quality buffer unit and the sampling distribution unit are arranged perpendicular to the horizontal plane in the pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922489600.XU CN211477748U (en) | 2019-12-31 | 2019-12-31 | Water quality sampling unit capable of accurately metering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922489600.XU CN211477748U (en) | 2019-12-31 | 2019-12-31 | Water quality sampling unit capable of accurately metering |
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| CN211477748U true CN211477748U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781933A (en) * | 2021-01-13 | 2021-05-11 | 安徽理工大学 | Filtering type sampler for suspended load silt and sampling method |
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2019
- 2019-12-31 CN CN201922489600.XU patent/CN211477748U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781933A (en) * | 2021-01-13 | 2021-05-11 | 安徽理工大学 | Filtering type sampler for suspended load silt and sampling method |
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