Micro-flow residual chlorine rapid online monitoring device

Abstract

The utility model relates to the technical field of water quality monitoring, and provides a micro-flow residual chlorine rapid online monitoring device which comprises a box body, a first peristaltic pump, a second peristaltic pump, a colorimetric pool, a throttling valve, an electromagnetic valve, a flow meter, a first reagent bottle for placing a reagent I, a second reagent bottle for placing a reagent II, a third reagent bottle for placing a standard sample and a water sample tube are arranged in the box body, and an inlet of the colorimetric pool is connected with the first peristaltic pump and the throttling valve; the other inlet of the colorimetric pool is connected with a first peristaltic pump, the other inlet of the colorimetric pool is connected with a second peristaltic pump, the first peristaltic pump is connected with a third reagent bottle, the second peristaltic pump is respectively connected with a first reagent bottle and a second reagent bottle, and a throttle valve is sequentially connected with an electromagnetic valve, a flow meter and a water sample pipe; the magnetic stirring device is arranged in the colorimetric pool, so that the uniform mixing effect of a trace reagent and a water sample in the colorimetric pool is ensured, mixing operations such as bubbling are not needed, and the interference of air on residual chlorine is prevented.

Description

Technical Field

[0001] This utility model relates to the field of water quality monitoring technology, and in particular to a rapid online monitoring device for micro-flow residual chlorine. Background Technology

[0002] Chlorine is added to tap water for disinfection. Medical wastewater and biological sewage are also commonly treated with chlorination for effluent disinfection. Therefore, controlling the chlorine concentration is directly related to the effectiveness of water disinfection. The national standard GB5749—2006, the Standard for Drinking Water Quality, specifies the required chlorine levels in tap water. Excessive residual chlorine will give the water an unpleasant odor, while insufficient residual chlorine will cause it to lose its sterilization ability; therefore, residual chlorine needs to be measured to control the disinfection process. Current online monitoring technology typically uses a peristaltic pump-powered, multi-way valve-based sampling, and quartz detection cell technology as the core of fully automated online detection. This technology is mature, stable, and widely used. However, it still has drawbacks such as low accuracy and long testing time. Furthermore, current devices suffer from air bubble interference during liquid mixing, leading to inaccurate detection. Utility Model Content

[0003] To solve the above problems, this utility model provides the following technical solution:

[0004] This utility model provides a micro-flow residual chlorine rapid online monitoring device, including a housing. The housing is equipped with a first peristaltic pump, a second peristaltic pump, a colorimetric cell, a throttling valve, a solenoid valve, a flow meter, a first reagent bottle for holding reagent one, a second reagent bottle for holding reagent two, a third reagent bottle for holding a standard sample, and a water sample tube. One inlet of the colorimetric cell is connected to the first peristaltic pump and the throttling valve, and the other inlet of the colorimetric cell is connected to the second peristaltic pump. The first peristaltic pump is connected to the third reagent bottle, and the second peristaltic pump is connected to the first reagent bottle and the second reagent bottle respectively. The throttling valve is connected in sequence to the solenoid valve, the flow meter, and the water sample tube.

[0005] The colorimetric cell is equipped with a magnetic stirring device to eliminate bubble interference and mix the reagents in the colorimetric cell.

[0006] Furthermore, the magnetic stirring device includes a stirring magnet, a magnetic stirring electrode, and a motor. The stirring magnet is disposed inside the colorimetric cell, and the magnetic stirring electrode is disposed below the colorimetric cell. Specifically, the motor drives the magnetic stirring electrode, and the magnetic field change generated by the rotation of the magnetic stirring electrode causes the stirring magnet in the colorimetric cell to rotate.

[0007] Furthermore, the first peristaltic pump is a DC single-channel peristaltic pump, and the second peristaltic pump is a dual-channel peristaltic pump.

[0008] Further, the flow range detected by the flow meter is 50-150 mL / min.

[0009] Further, the online monitoring device further comprises a microfluidic chip, which is arranged at the inlet of the cuvette.

[0010] Further, the microfluidic chip comprises a liquid inlet section, a mixing section and a liquid outlet section connected in sequence along the fluid conveying direction.

[0011] Further, the throttle valve, the first peristaltic pump and the second peristaltic pump are connected with the liquid inlet section of the microfluidic chip, and the cuvette is connected with the liquid outlet section of the microfluidic chip.

[0012] Further, the flow channel aperture of the microfluidic chip is 0.5-1 mm.

[0013] Further, the box is provided with a control module for controlling the first peristaltic pump and the second peristaltic pump.

[0014] Further, the box is provided with a display screen.

[0015] The utility model has the following beneficial effects:

[0016] (1) The cuvette is provided with a magnetic stirring device, which ensures the mixing of the micro reagent and the water sample in the cuvette, eliminates the need for bubbling and other mixing operations, and prevents air from interfering with the residual chlorine.

[0017] (2) In the environment of pipe network pressure water sampling, the idle first peristaltic pump sampling port can be connected to the standard port for calibration and calibration.

[0018] (3) The utility model has simple pipeline and the whole detection process is not more than 2 min, which can meet the requirements of rapid detection of residual chlorine. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the schematic diagram of the whole structure of example 1.

[0020] Figure 2 is the schematic diagram of the pipeline of example 1.

[0021] Figure 3 is the cross-sectional view of the cuvette in example 1. DETAILED DESCRIPTION

[0022] The specific embodiments of the utility model are described in detail below in combination with the drawings, and it should be pointed out that the embodiments are only specific descriptions of the utility model and should not be regarded as limitations of the utility model, the purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical scheme of the utility model, and the protection scope of the utility model should still be limited by the range defined in the claims.

[0023] Embodiment 1

[0024] As Figures 1-2 Indicated, the embodiment provides a kind of micro-flow residual chlorine fast online monitoring device, including box 100, first peristaltic pump 1, second peristaltic pump 2, colorimetric cell 3, throttle valve 4, electromagnetic valve 5, flowmeter 6 are equipped in the box 100, first reagent bottle 7 for placing reagent one, second reagent bottle 8 for placing reagent two, water sample pipe 9 and fourth reagent bottle 10 for placing standard sample, one inlet of the colorimetric cell 3 is connected with first peristaltic pump 1, throttle valve 4, another inlet of the colorimetric cell 3 is connected with second peristaltic pump 2, the first peristaltic pump 1 is connected with fourth reagent bottle 10, the second peristaltic pump 2 is connected with first reagent bottle 7, second reagent bottle 8 respectively, the throttle valve 4 is sequentially connected with electromagnetic valve 5, flowmeter 6 and water sample pipe 9;

[0025] Magnetic stirring device 31 is equipped in the colorimetric cell 3, for eliminating bubble interference and mixing reagent in colorimetric cell 3, in addition, without bubbling mixing in the process of sampling.The magnetic stirring device 31 includes stirring magnet, magnetic stirring electrode and motor, the stirring magnet is arranged in colorimetric cell, the magnetic stirring electrode is arranged below colorimetric cell, specifically, motor drives magnetic stirring electrode, and the magnetic field change generated by the rotation of magnetic stirring electrode drives the stirring magnet in colorimetric cell to rotate.

[0026] Overall flow path design is double-channel flow path design, the leftmost side is the pressure valve control system of pressure water sampling, mainly for process pipeline water environment, uses pipeline water pressure to provide sampling power, opens electromagnetic valve to complete water sample sampling in pressure water, if not pressure water, then using first peristaltic pump sampling, the flow of two is same, first peristaltic pump sampling and electromagnetic valve opening valve can replace at any time along with sampling mode difference.Under pressure water sampling scheme, flowmeter needs to be detected, can be normally measured in 50mL / min-150mL / min flow interval, interval outside water sample pressure is too large to hurt reaction cell, too small to sample measurement.

[0027] Among them, the first peristaltic pump 1 is direct current single-pass peristaltic pump, and the second peristaltic pump 2 is double-channel peristaltic pump.The flow interval detected by the flowmeter is 50mL / min-150mL / min.The control module 101 is equipped in the box 100 for controlling the first peristaltic pump and the second peristaltic pump.

[0028] The box 100 is provided with a display screen 102.

[0029] Embodiment 2

[0030] The embodiment provides a micro-flow residual chlorine fast online monitoring device, which comprises a box 100, a first peristaltic pump 1, a second peristaltic pump 2, a colorimetric cell 3, a throttle valve 4, an electromagnetic valve 5, a flow meter 6, a micro-fluidic chip 11, a first reagent bottle 7 for placing reagent one, a second reagent bottle 8 for placing reagent two, a water sample pipe 9 and a fourth reagent bottle 10 for placing a standard sample are arranged in the box 100, and the micro-fluidic chip 11 is arranged at the inlet of the colorimetric cell. The micro-fluidic chip 11 comprises a liquid inlet section, a mixing section and a liquid outlet section which are sequentially connected in the fluid conveying direction; the throttle valve 4, the first peristaltic pump 1 and the second peristaltic pump 2 are connected with the liquid inlet section of the micro-fluidic chip 11, and the colorimetric cell 3 is connected with the liquid outlet section of the micro-fluidic chip 11; the first peristaltic pump 1 is connected with the fourth reagent bottle 10, the second peristaltic pump 2 is connected with the first reagent bottle 7 and the second reagent bottle respectively, and the throttle valve 4 is sequentially connected with the electromagnetic valve 5, the flow meter 6 and the water sample pipe 9.

[0031] The colorimetric cell 3 is provided with a magnetic stirring device 31, which is used for eliminating bubble interference and mixing reagents in the colorimetric cell 3. The magnetic stirring device comprises a stirring magnet, a magnetic stirring electrode and a motor, the stirring magnet is arranged in the colorimetric cell, and the magnetic stirring electrode is arranged below the colorimetric cell; specifically, the motor drives the magnetic stirring electrode, and the magnetic field change generated by the rotation of the magnetic stirring electrode drives the stirring magnet in the colorimetric cell to rotate.

[0032] The first peristaltic pump 1 is a direct-current one-way peristaltic pump, and the second peristaltic pump 2 is a double-channel peristaltic pump. The flow range detected by the flow meter is 50mL / min-150mL / min. The flow channel aperture of the micro-fluidic chip 11 is 0.5-1mm.

[0033] The box 100 is provided with a control module 101, which is used for controlling the first peristaltic pump and the second peristaltic pump.

[0034] The box 100 is provided with a display screen 102.

[0035] Test basic principle:

[0036] According to the GB / T 14424-2008 industrial circulating cooling water residual chlorine determination, the national standard detection method, when the pH is about 6.2-6.5, the free chlorine in the water sample directly reacts with N, N-diethylnaphthalene-1, 4-benzene diamine (DPD) to generate a red compound, which is determined by using a spectrophotometric method at a wavelength of 510nm, and the absorbance is proportional to the concentration.

[0037] Two reagents are used as color developing solution, reagent one is buffer solution, reagent two is DPD color developing agent, and the two reagents are injected into the color developing reactor for colorimetric color development.

[0038] The test procedure is as follows:

[0039] (1) open the throttle valve and electromagnetic valve, the water sample enters the colorimetric cell through the microfluidic chip, flushes and rinses the colorimetric cell for 30s, and removes the entire flow path; at this time, the colorimetric cell is filled with the water sample to be tested;

[0040] (2) close the throttle valve and electromagnetic valve, the magnetic stirring device is stirred for 10s, and then stopped, and the water sample is blank tested;

[0041] (3) the second peristaltic pump is rotated forward for 10s, and reagent one and reagent two are injected into the colorimetric cell through the microfluidic chip;

[0042] (4) the magnetic stirring device is stirred for 10s, and then stopped, color development detection is performed, and the test result is obtained;

[0043] (6) open the throttle valve and electromagnetic valve, the water sample enters the colorimetric cell through the microfluidic chip, and the colorimetric cell is cleaned.

[0044] The overall process is fast, and the entire detection process does not exceed 2min, which can meet the requirements of rapid detection of residual chlorine. The conventional measurement scheme process usually needs more than 20min, which is difficult to meet the demand of rapid testing of water samples. The reagent consumption of the utility model is about 0.04mL, which is much lower than the reagent consumption of about 1mL in the conventional test, and the consumption of the reagent is reduced.

[0045] Although the preferred embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the application.

[0046] It should be noted that the technical features not described in detail in the utility model can be realized by any existing technology.

Claims

1. A micro-flow residual chlorine fast online monitoring device, characterized in that, The box is internally provided with a first peristaltic pump, a second peristaltic pump, a cuvette, a throttle valve, a solenoid valve, a flow meter, a first reagent bottle for placing reagent one, a second reagent bottle for placing reagent two, a third reagent bottle for placing a standard sample and a water sample pipe, one inlet of the cuvette is connected with the first peristaltic pump and the throttle valve, the other inlet of the cuvette is connected with the second peristaltic pump, the first peristaltic pump is connected with a fourth reagent bottle, the second peristaltic pump is respectively connected with the first reagent bottle and the second reagent bottle, the throttle valve is sequentially connected with the solenoid valve, the flow meter and the water sample pipe. The cuvette is internally provided with a magnetic stirring device for eliminating bubble interference and mixing reagents in the cuvette.

2. The micro-flow residual chlorine fast online monitoring device according to claim 1, characterized in that, The magnetic stirring device comprises a stirring magnet, a magnetic stirring electrode and a motor, the stirring magnet is arranged in the cuvette, and the magnetic stirring electrode is arranged below the cuvette.

3. The micro-flow residual chlorine fast on-line monitoring device according to claim 1, characterized in that, The first peristaltic pump is a direct current single-pass peristaltic pump, and the second peristaltic pump is a double-channel peristaltic pump.

4. The micro-flow residual chlorine fast on-line monitoring device according to claim 1, characterized in that, The flow range detected by the flow meter is 50 mL / min-150 mL / min.

5. The micro-flow residual chlorine fast on-line monitoring device according to claim 1, characterized in that, The online monitoring device further comprises a microfluidic chip arranged at an inlet of the cuvette.

6. The micro-flow residual chlorine fast on-line monitoring device according to claim 5, characterized in that, The microfluidic chip comprises a liquid inlet section, a mixing section and a liquid outlet section connected in sequence along a fluid conveying direction.

7. The micro-flow residual chlorine fast online monitoring device according to claim 6, characterized in that, The throttle valve, the first peristaltic pump and the second peristaltic pump are connected with the liquid inlet section of the microfluidic chip, and the cuvette is connected with the liquid outlet section of the microfluidic chip.

8. The micro-flow residual chlorine fast on-line monitoring device according to claim 6, characterized in that, The flow channel aperture of the microfluidic chip is 0.5-1 mm.

9. The micro-flow residual chlorine fast on-line monitoring device according to claim 1, characterized in that, The box is internally provided with a control module for controlling the first peristaltic pump and the second peristaltic pump.

10. The micro-flow residual chlorine fast on-line monitoring device according to claim 5, characterized in that, The box is internally provided with a display screen.

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