CN114323897A - A photoelectric sensor-based water quality monitoring dilution and standard addition device - Google Patents

Abstract

The invention relates to the technical field of online automatic measurement of water quality, and discloses a water quality monitoring diluting and labeling device based on photoelectric sensors, which comprises a sample pool, wherein a plurality of first photoelectric sensors and second photoelectric sensors are respectively and equidistantly mounted and fixed at the upper end and the lower end of the left side and the right side of the sample pool, the bottom of the sample pool is communicated with one end of a liquid inlet pipe, the other end of the liquid inlet pipe is communicated with a micro pump, the liquid inlet end at the bottom of the micro pump is communicated with a labeling bottle through a pipeline, the bottom of the left side of the sample pool is communicated with one end of a liquid outlet pipe, and the other end of the liquid outlet pipe is communicated with a sampling valve. Pure water or water sample is selected to be fed through the six-way valve; the volume of the constant volume can be selected, and whether liquid exists or not can be judged through the photoelectric sensor; air can be pumped in through the peristaltic pump for air stirring, so that the uniformity of substances to be detected in the sample cell is ensured; the liquid in the sample cell can be subjected to waste liquid separation; and optionally adding a cleaning agent sample pool for cleaning.

Description

A photoelectric sensor-based water quality monitoring dilution and standard addition device

technical field

The invention relates to the technical field of online automatic measurement of water quality, in particular to a water quality monitoring dilution and standard addition device based on a photoelectric sensor.

Background technique

In automatic water quality monitoring, in order to ensure the long-term stability and accuracy of online monitoring data, it is necessary to carry out quality control, check the test accuracy of the instrument, and ensure that the error of the data is within the allowable range. The water samples were spiked and recovered for evaluation. Checking the known concentration standard solution can reflect the basic state of the online monitor and whether the standard curve is normal. The standard addition recovery takes into account the water background, that is, whether there is interference in the water body is judged by whether the standard addition recovery rate is normal, and further reflects whether the method used by the online monitor is suitable for the measured water body.

At present, in the field of online water quality monitoring, quality control instruments or quality control systems with standard addition and recovery have been widely used. However, the existing standard adding device has the following problems: first, it can usually only achieve a specific function, such as only adding standard water samples or only providing a certain concentration of standard solution; second, the volume of constant volume is usually fixed, which cannot be Adjust according to the needs of the online monitor. For example, some monitors require less samples for one measurement, and if a larger amount of samples are provided, it will cause waste, and if some monitors require more samples for one measurement, if samples are provided Insufficient results will result in failure to test; the third is that there is usually no waste liquid separation function, and the liquid or water sample is not discharged separately from the cleaning wastewater after adding the standard; the fourth is that the regular automatic cleaning of the sample pool is not considered, because the sample pool often contacts water The contaminants in the water sample adhere to the inner wall of the sample cell and cause subsequent contamination.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a water quality monitoring dilution and standard addition device based on a photoelectric sensor, which solves the problems raised in the background art.

In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a photoelectric sensor-based water quality monitoring dilution and standard addition device, comprising a sample pool, and a plurality of first and third A photoelectric sensor and a second photoelectric sensor, the bottom of the sample cell is connected to one end of the liquid inlet pipe, the other end of the liquid inlet pipe is connected to a micro pump, and the liquid inlet end of the bottom of the micro pump is connected to a standard solution bottle through a pipeline, The bottom of the left side of the sample pool is connected with one end of the liquid outlet pipe, the other end of the liquid outlet pipe is connected with a sampling valve, the bottom of the sample pool is connected with a peristaltic pump through a pipeline, and the bottom of the peristaltic pump is connected to the right side. There is a drain pipe, the bottom of the drain pipe is connected with a six-connected valve, and the top of the sample pool is connected with an air pipe.

As a preferred embodiment of the present invention, the material of the sample cell is plastic or glass, such as transparent materials such as plexiglass; the sample cell is rectangular, and a photoelectric sensor is installed on its side; the bottom of the sample cell is arc-shaped.

As a preferred embodiment of the present invention, the combination of the peristaltic pump, the six-part valve and the photoelectric sensor can be used for constant volume, and the combination of the peristaltic pump and the six-part valve can realize the pumping of water samples and pure water into or out of the sample cell. , and the volume of the high and low liquid level can also be determined according to the position of the photoelectric sensor.

As a preferred embodiment of the present invention, the combination of the peristaltic pump and the six-way valve can be used for waste liquid separation.

As a preferred embodiment of the present invention, the combination of the peristaltic pump and the six-valve can add specific cleaning agents.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The present invention is simple in structure and easy to use. The pure water or water sample higher than the photoelectric sensor is discharged through the peristaltic pump, so that the constant volume volume can be selected in two gears; through the cooperation of the peristaltic pump and the six-way valve, the direction Pure water or water samples are pumped into the sample pool to realize the function of standard solution dilution and water sample addition; through the cooperation of the peristaltic pump and the six-way valve, the liquid in the sample pool can be selectively discharged into the waste water pipe or waste liquid pipe to reduce waste liquid volume and maintenance cost; through the cooperation of peristaltic pump and six-way valve, a specific cleaning agent can be selectively pumped into the sample cell, combined with air bubbling and stirring, so that its cleaning effect is good, ensuring that The sample cell is kept clean for a long time, and the substance to be tested will not be adsorbed due to sediment.

Description of drawings

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

FIG. 1 is a schematic diagram of the overall structure of a photoelectric sensor-based water quality monitoring dilution and standard addition device of the present invention.

In the figure: 1. Sample cell; 2. The first photoelectric sensor; 3. The second photoelectric sensor; 4. Sampling tube; 5. Micro pump; 6. Standard solution bottle; 7. Sampling tube; 8. Sampling valve; 9 , peristaltic pump; 10, six valve; 11, air pipe; 12, drain pipe; 13, air pipe; 14, water sample pipe; 15, pure water pipe; 16, waste pipe; 17, waste liquid pipe; 18 , Spare tube.

Detailed ways

Referring to FIG. 1, the present invention provides a technical solution: a photoelectric sensor-based water quality monitoring dilution and standard addition device, comprising a sample inlet tube 4 connected to a micro pump on the outer wall of a sample cell 1, a sampling tube of a sampling valve 8 7. There is a drain pipe 12 with a peristaltic pump 9 and a six-way valve 10 at the bottom; at the same time, the high and low first photoelectric sensor 2 and the second photoelectric sensor 3 are installed on both sides of the sample cell 1 and are horizontally aligned; the top of the sample cell 1 is connected There is an air pipe 11 .

In the present invention, the material of the sample cell 1 is plastic or glass, such as transparent and inert materials such as plexiglass, which can ensure the normal operation of the photoelectric sensor and will not affect the water quality of the water sample, and the sample cell 1 is a rectangle with a round bottom. Arc-shaped, so as to facilitate the discharge of impurities with the water sample through the drain pipe 12, further reducing residues; The cross-sectional area of 1 determines the constant volume volume. The peristaltic pump 9 draws pure water or water sample into the sample cell 1 and makes it slightly higher than the first photoelectric sensor 2 and the second photoelectric sensor 3, and then the peristaltic pump 9 slowly The liquid in the sample cell 1 is discharged in reverse until the liquid level in the sample cell 1 drops to the position of the photoelectric sensor, the first photoelectric sensor 2 and the second photoelectric sensor 3 detect the change of the light signal caused by the concave liquid surface, and stop. The liquid discharge action of the peristaltic pump 9 completes the constant volume, and the remaining pure water or water sample is the constant volume during the standard solution dilution or standard addition recovery test. The micro pump 5 can pump the standard solution 6 in the standard solution bottle into the sample pool 1 in the form of pulses. When the sample pool 1 is pure water, the diluted standard solution can be obtained, and the sample pool 1 is a water sample. When , the sample after adding the standard can be obtained, and because the number of pulses of the micro pump 5 can be set, standard solutions or samples with different concentrations and series gradients can be obtained. The peristaltic pump 9 can be rotated forward or reversely, and can be used in combination with the six-way valve 10 to realize the addition of water samples, pure water, and backup cleaning agents or discharge of the sample pool 1, and can also realize the pumping of air into the sample pool 1. By stirring the liquid in the sample pool 1, the residual liquid in the sample pool 1 can also be selectively discharged into the waste water pipe 16 or the waste water pipe 17, so as to realize the separation of waste liquid. The sampling valve 8 can provide the diluted or standard-added liquid in the sample pool 1 to the online monitoring instrument at a specified time, or directly provide the water sample to the online monitoring instrument without passing through the sample pool 1 .

The device requires a power supply of 220V to be directly connected to the mains. At the same time, the relevant instruments and electronic equipment mentioned in the device are all existing products, so the relevant specific models are not clearly indicated.

When the device is working, it can be divided into four steps to realize the dilution of the standard solution: the first step is to inject pure water: the pure water enters the interior of the sample pool 1 through the pure water inlet pipe 15, the six-joint valve 10 and the peristaltic pump 9, and the six-joint valve is inserted into the sample pool 1. 10 is switched to the pure water pipe 15, the peristaltic pump 9 is turned on and rotates forward. When the pure water enters the sample cell 1 and the liquid level rises to the required liquid level, the first photoelectric sensor 2 and the second photoelectric sensor 3 send out the liquid level signal. After a short period of time, stop the peristaltic pump 9 and the six-joint valve 10 and add pure water. The second step is to fix the volume: the six-way valve 10 is switched to the waste water pipe 16, the peristaltic pump 9 is slowly reversed, and the liquid in the sample cell 1 is discharged in reverse until the liquid level in the sample cell 1 drops to the first photoelectric sensor 2 and the first photoelectric sensor. The position of the second photoelectric sensor 3, the first photoelectric sensor 2 and the second photoelectric sensor 3 send a liquid level signal, and immediately stop the liquid discharge action of the peristaltic pump 9, that is, the constant volume is completed. The third step is to dilute and stir the standard solution: turn on the micro pump 5, pump the quantitative standard solution 6 into the sample pool 1 through the liquid inlet pipe 4, then stop the micro pump 5, switch the six-way valve 10 to the air pipe 13, peristaltic The pump 9 is rotated forward, and the air is pumped into the sample cell 1, and the stirring action is performed to complete the dilution. The water quality online monitor can take samples from the sampling tube 7 through the sampling valve 8 for standard liquid analysis, and calculate the indication error or accuracy; the fourth step of cleaning: after the instrument has taken the diluted standard liquid, the six-connected valve 10 is switched to Waste liquid pipe 17, turn on the peristaltic pump 9 to reverse, discharge the remaining standard liquid from the waste liquid pipe 17, close the peristaltic pump 6, and then switch the six-joint valve 10 to the pure water pipe 15, open the peristaltic pump 9 to rotate forward, and turn the pure water pipe 10 on. The water is pumped into the cleaning sample pool 1. After cleaning for a period of time, the six-joint valve 10 is switched to the waste water pipe 16, the peristaltic pump 9 is turned on and the cleaning water is discharged, the six-joint valve 10 is closed, and the peristaltic pump 9 is closed to end the whole process.

When the device is working, the water sample addition can be divided into four steps: the first step of water sample testing: the water sample enters the interior of the sample pool 1 through the water inlet sample tube 14, the six-joint valve 10 and the peristaltic pump 9, and the six-joint valve is inserted into the sample pool 1. 10 is switched to the water sample tube 14, the peristaltic pump 9 is turned on and rotates forward, when the water sample enters the sample cell 1, and the liquid level rises to the required liquid level, the first photoelectric sensor 2 and the second photoelectric sensor 3 send a liquid level signal, After continuing for a period of time, stop the peristaltic pump 9 and the six-way valve 10 to add water samples. The water quality online monitor takes samples from the sampling pipe 7 through the sampling valve 8 for water sample analysis; the second step is to set the volume: the six-way valve 10 is switched to the waste water pipe 16, the peristaltic pump 9 is slowly reversed, and the liquid in the sample pool 1 is reversed. Discharge, until the liquid level in the sample cell 1 drops to the position of the first photoelectric sensor 2 and the second photoelectric sensor 3, the first photoelectric sensor 2 and the second photoelectric sensor 3 send a liquid level signal, and immediately stop the peristaltic pump 9. That is to complete the volume. The third step is adding and stirring: turn on the micro pump 5, pump the quantitative standard solution into the sample cell 1 through the liquid inlet pipe 4, then stop the micro pump 5, switch the six-way valve 10 to the air pipe 13, and the peristaltic pump 9 is positive Turn, pump the air into the sample cell 1, perform stirring action, stir evenly, and complete the standard addition. The water quality online monitor can then take samples from the sampling pipe 7 through the sampling valve 8 to analyze the water sample after the addition of the standard, and calculate the recovery rate of the standard addition based on the two analysis results; the fourth step of cleaning: the instrument takes the water sample after the addition of the standard. After that, the six-joint valve 10 is switched to the waste liquid pipe 17, the peristaltic pump 9 is turned on and reversed, the remaining water sample after adding the standard is discharged from the waste liquid pipe 17, the peristaltic pump 6 is turned off, and then the six-joint valve 10 is switched to the pure water pipe. 15. Turn on the peristaltic pump 9 to rotate forward, and pump the pure water into the cleaning sample pool 1. After cleaning for a period of time, the six-way valve 10 is switched to the waste water pipe 16, turn on the peristaltic pump 9 to reverse, discharge the cleaning water, and close the six-way valve 10. , turn off the peristaltic pump 9, and end the whole process. If you need to add cleaning agent, you can pass the spare pipe 18 in advance, switch the six-way valve 10 to the spare pipe 18, the peristaltic pump 9 rotates forward, and pump a certain amount of cleaning agent into the sample pool 1.

In summary, the photoelectric sensor-based water quality monitoring dilution and standard addition device discharges pure water or water samples higher than the photoelectric sensor through the peristaltic pump 9, so that the constant volume volume can be selected in two levels; through the peristaltic pump 9 With the cooperation of the six-way valve 10, pure water or water samples can be selectively pumped into the sample pool 1, so as to realize the function of standard solution dilution and water sample addition; through the cooperation of the peristaltic pump 9 and the six-way valve 10 , so that the liquid in the sample pool 1 can be selectively discharged into the waste water pipe 16 or the waste liquid pipe 17, reducing the volume of waste liquid and reducing maintenance costs; through the cooperation of the peristaltic pump 9 and the six-way valve 10, the sample pool 1 The specific cleaning agent is pumped, combined with air bubbling and stirring, so that the cleaning effect is good, and the sample cell 1 is kept clean for a long time, and the substance to be tested will not be adsorbed due to sediment.

The invention is a water quality monitoring dilution and standard addition device based on a photoelectric sensor, comprising: 1. a sample cell; 2. a first photoelectric sensor; 3. a second photoelectric sensor; 4. a sampling tube; 5. a micro pump; 6. Standard liquid bottle; 7. Sampling tube; 8. Sampling valve; 9. Peristaltic pump; 10. Six valve; 11. Air tube; 12. Drain tube; 13. Air tube; 14. Water sample tube; 15. Pure Water pipe; 16. Waste water pipe; 17. Waste liquid pipe; Or known by conventional experimental methods.

Claims (9)

1. The utility model provides a water quality monitoring dilutes and adds mark device based on photoelectric sensor, includes sample cell (1), its characterized in that: a plurality of first photoelectric sensors (2) and second photoelectric sensors (3) are respectively and fixedly arranged at the upper end and the lower end of the left side and the right side of the sample cell (1) at equal intervals, the bottom of the sample pool (1) is communicated with one end of a liquid inlet pipe (4), the other end of the liquid inlet pipe (4) is communicated with a micro pump (5), the liquid inlet end at the bottom of the micro pump (5) is communicated with a liquid marking bottle (6) through a pipeline, the bottom of the left side of the sample cell (1) is communicated with one end of a liquid outlet pipe (7), the other end of the liquid outlet pipe (7) is communicated with a sampling valve (8), the bottom of the sample cell (1) is communicated with a peristaltic pump (9) through a pipeline, the right side of the bottom of the peristaltic pump (9) is communicated with a liquid discharge pipe (12), the bottom of the liquid discharge pipe (12) is communicated with a six-way valve (10), and the top of the sample pool (1) is communicated with an air pipe (11).

2. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 1, wherein: the appearance of sample cell (1) is transparent organic glass square, and the bottom is arc, is used for making things convenient for discharge of fluid-discharge tube (5) to the inside liquid of sample cell (1).

3. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 1, wherein: the level opposition of high liquid level and low liquid level first photoelectric sensor (2) and second photoelectric sensor (3) can detect the existence of the inside liquid of sample cell (1) to carry out accurate judgement to the liquid level of the inside liquid of sample cell (1), thereby confirm the liquid volume, and select to use the height liquid level can change the constant volume.

4. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 1, wherein: the left side of the six-way valve (10) is respectively connected with an air pipe (13), a water sample pipe (14), a pure water pipe (15), a waste water pipe (16), a waste liquid pipe (17) and a standby pipe (18) from top to bottom.

5. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 4, wherein: when the peristaltic pump (9) is reversed and the air pipe (13) is opened, the liquid in the sample cell (1) can be stirred by the air bubbles through the air pipe (13).

6. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 4, wherein: when the peristaltic pump (9) is reversed and the water sample pipe (14) is opened, a water sample can be pumped into the sample pool (1) through the water sample pipe (14).

7. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 4, wherein: when the peristaltic pump (9) is reversed and the deionized water pipe (15) is opened, deionized water can be pumped into the sample cell (1) through the deionized water pipe (15).

8. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 4, wherein: when the peristaltic pump (9) is rotated in the forward direction and the waste pipe (16) is opened, liquid can be discharged from the sample cell (1) via the waste pipe (16).

9. The water quality monitoring diluting and labeling device based on the photoelectric sensor as claimed in claim 4, wherein: when the peristaltic pump (9) is rotated in the forward direction and the waste tube (17) is opened, liquid can be discharged from the sample cell (1) via the waste tube (17), and the backup tube (18) can expand the cleaning agent.

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