A multi-parameter water quality online analyzer

Abstract

The present invention provides a multi-parameter water quality online analyzer, which uses a first peristaltic pump to extract samples, and can be pumped into a digester through a first three-way electric valve, a first three-way solenoid valve, a second three-way solenoid valve, a third three-way solenoid valve, and a fourth three-way solenoid valve; a third peristaltic pump is connected in series between the fourth three-way solenoid valve and the second three-way electric valve, and the third peristaltic pump pumps the digested sample into the second three-way electric valve also connected to the third three-way solenoid valve; the second three-way electric valve is also connected to the first pipeline connected to the first photometer through the fifth three-way electric valve, and the fifth three-way electric valve is also connected to the second photometer; the oxidant is pumped from the second peristaltic pump to the second three-way solenoid valve and mixed with the sample before digestion; the first three-way solenoid valve is connected to the second pipeline of the color developer required for extracting total nitrogen. Each electrical element of the present invention is controlled by a single-chip microcomputer, and the measurement pipelines of total phosphorus, total nitrogen, and ammonia nitrogen parameters share multiple common components, with a compact structure and wide application.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental monitoring and relates to a multi-parameter water quality online analyzer. Background Art

[0002] With the maturity of automation control technology and the exponential growth of demand for chemical analysis applications, online water quality analyzers came into being in the 1930s and 1940s. Online water quality analyzers are mainly used for water quality monitoring of domestic water, sewage treatment, and industrial process control.

[0003] Although decades of technological evolution have greatly improved the performance indicators of online water quality analysis products in terms of measurement methods and accuracy, the products currently on the market are all developed separately based on a certain parameter or 2-3 parameters. For example, they can only measure total phosphorus, total nitrogen, chemical oxygen demand, ammonia nitrogen, or only total phosphorus + total nitrogen. The degree of integration is not high, the design is rigid, and there is a lack of upgrade and expandability potential. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a multi-parameter water quality online analyzer to solve the problem in the prior art that the analyzer is developed separately based on only one parameter or 2-3 parameters.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a multi-parameter water quality online analyzer, comprising:

[0006] A first peristaltic pump, an input end of which is connected to an output end of the electric valve group, and an input end of the electric valve group is connected to a sample container containing a measurement sample;

[0007] A first three-way electric valve is connected to the output end of the first peristaltic pump; the first three-way electric valve is connected to the inlet of the digester via a first three-way solenoid valve, a second three-way solenoid valve, a third three-way solenoid valve, and a fourth three-way solenoid valve;

[0008] A third peristaltic pump, whose input end is connected to the fourth three-way solenoid valve, and whose output end is connected to the second three-way electric valve; the second three-way electric valve is also connected to the third three-way solenoid valve;

[0009] A first pipeline is provided for extracting a colorimetric reagent required for measuring total phosphorus, one side of the first pipeline is connected to the second three-way electric valve via a fifth three-way electric valve, the other side of the first pipeline is connected to a first photometer, the fifth three-way electric valve is further connected to a second photometer via a seventh three-way solenoid valve, and the first photometer and the second photometer are further connected to drainage pipes respectively;

[0010] a second peristaltic pump, an input end of which is connected to the oxidant container, and an output end of which is connected to the second three-way solenoid valve;

[0011] A second pipeline is provided for extracting a color developing reagent required for measuring total nitrogen, and the second pipeline is connected to the first three-way solenoid valve;

[0012] The single chip microcomputer is used to control the electrical components in the analyzer.

[0013] In one embodiment of the present invention, the third pipeline is provided for extracting reagents required for measuring ammonia nitrogen. One side of the third pipeline is connected to the first three-way electric valve through a sixth three-way electric valve, and the other side of the third pipeline is connected to the seventh three-way solenoid valve through an eleventh three-way solenoid valve. The sixth three-way electric valve is also directly connected to the eleventh three-way solenoid valve.

[0014] In one embodiment of the present invention, an ultraviolet lamp is disposed in the digester.

[0015] In one embodiment of the present invention, the ultraviolet lamp emits ultra-short ultraviolet light UVC.

[0016] In one embodiment of the present invention, a heat dissipation container is connected in series on the pipeline between the third peristaltic pump and the fourth three-way solenoid valve, and the heat dissipation container is placed at the bottom of the digester.

[0017] In one embodiment of the present invention, the inner diameter of the heat dissipation container is larger than the diameter of the pipeline connected thereto.

[0018] In one embodiment of the present invention, the first pipeline comprises a ninth peristaltic pump and a tenth peristaltic pump, the ninth peristaltic pump and the tenth peristaltic pump are respectively connected to a first reagent bottle and a second reagent bottle containing a color developer for measuring total phosphorus, the ninth peristaltic pump and the tenth peristaltic pump are also respectively connected to a fifth three-way solenoid valve and a thirteenth three-way solenoid valve at their output ends, the thirteenth three-way solenoid valve is also respectively connected to the fifth three-way electric valve and the fifth three-way solenoid valve, and the fifth three-way solenoid valve is connected to the input end of the first photometer.

[0019] In one embodiment of the present invention, the second pipeline includes a fourth peristaltic pump and a fifth peristaltic pump installed near the second peristaltic pump, the fourth peristaltic pump and the fifth peristaltic pump are respectively connected to a sixth reagent bottle and a seventh reagent bottle containing a color developer for measuring total nitrogen, the fourth peristaltic pump and the fifth peristaltic pump are also respectively connected to a sixth three-way solenoid valve, and the sixth three-way solenoid valve is also connected to the first three-way solenoid valve.

[0020] In one embodiment of the present invention, the third pipeline includes a sixth peristaltic pump, a seventh peristaltic pump and an eighth peristaltic pump, the sixth peristaltic pump, the seventh peristaltic pump and the eighth peristaltic pump are connected to a third reagent bottle, a fourth reagent bottle and a fifth reagent bottle containing corresponding color developers, the output end of the sixth peristaltic pump is connected to the eighth three-way solenoid valve, the eighth three-way solenoid valve is also respectively connected to the sixth three-way electric valve and the ninth three-way solenoid valve, the output ends of the seventh peristaltic pump and the eighth peristaltic pump are respectively connected to the ninth three-way solenoid valve and the thirteenth solenoid valve, the ninth three-way solenoid valve is also connected to the thirteenth solenoid valve, and the thirteenth solenoid valve is also connected to the eleventh three-way solenoid valve.

[0021] In one embodiment of the present invention, the first photometer comprises:

[0022] Xenon lamp;

[0023] A full-spectrum detector is connected to the xenon lamp by an optical fiber, the full-spectrum detector is provided with a detector housing, and a colorimetric cell, a parallel lens and a convergent lens disposed in the detector housing, the colorimetric cell is disposed between the parallel lens and the convergent lens, and a liquid inlet and an overflow port of the colorimetric cell are connected to the fifth three-way solenoid valve and the liquid discharge pipe respectively;

[0024] The optical receiver is connected to the full-spectrum detector by optical fiber. A reflection cavity for light beam reflection is arranged inside the optical receiver. A photoelectric sensor array is arranged on the side wall of the reflection cavity. The photoelectric sensor array is electrically connected to the single-chip microcomputer in the analyzer.

[0025] As described above, the multi-parameter online water quality analyzer of the present invention can measure at least three parameters: total phosphorus, total nitrogen, and ammonia nitrogen. It is widely used. When measuring multiple parameters, common components can be shared and the measurements will not interfere with each other, so that the measuring pipelines can be placed in the same casing, and the structure is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a schematic diagram of the flow path of a multi-parameter water quality online analyzer in one embodiment of the present invention.

[0027] Figure 2 Shown is a schematic diagram of the structure of the digester in the multi-parameter water quality online analyzer of the present invention.

[0028] Figure 3 Shown is a schematic structural diagram of the first photometer in the multi-parameter water quality online analyzer of the present invention.

[0029] Figure 4 Shown is a schematic diagram of the pipeline involved in measuring total phosphorus in the multi-parameter water quality online analyzer of the present invention.

[0030] Figure 5 Shown is a schematic diagram of the pipeline involved in measuring total nitrogen in the multi-parameter water quality online analyzer of the present invention.

[0031] Figure 6 Shown is a schematic diagram of the pipeline involved in measuring ammonia nitrogen in the multi-parameter water quality online analyzer of the present invention.

[0032] Figure 7 Shown is a schematic diagram of the pipeline involved in measuring chemical oxygen demand (COD), nitrate or turbidity in the multi-parameter water quality online analyzer of the present invention. DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0035] See also Figure 1 The present invention provides a multi-parameter online analyzer, which mainly includes a casing (not shown in the figure), a digester 100 placed in the casing, an optical path system and a single-chip microcomputer, and a display screen, and the display screen can be a touch screen.

[0036] The casing is a shell with a rectangular inner cavity. A flap is provided at the opening of the casing, and the flap is rotatably connected to one end of the casing by a rotating member. A partition 900 is also provided inside the casing, and the partition 900 is rotatably connected to one inner wall of the casing. The partition 900 divides the inner cavity of the casing into an outer chamber and an inner chamber, wherein the digester 100, the reaction pool assembly, and the optical path system are respectively installed on the surface of the partition 900 placed in the outer chamber, and the single chip microcomputer is placed in the inner chamber and fixed to the side wall of the casing by a support frame.

[0037] Furthermore, a display screen for displaying the analysis results is installed on the flip cover, and the single-chip microcomputer uses electrical circuits to connect the digester 100 and the electrical components in the optical path system, and displays the detected results to the user through the display screen. The display screen can be a touch screen, and the user can select the total phosphorus, total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate or turbidity of the water quality to be tested by clicking on the touch screen. The single-chip microcomputer can start the corresponding control program according to the electrical signal generated by the user clicking on the touch screen, and complete the water quality detection in sequence.

[0038] like Figure 2 As shown, the digester 100 is provided with a digestion chamber 102, and electromagnetic valves are installed at the sample inlet and the drain port of the digestion chamber 102, and the drain port is directly connected to the drain pipe. A heating plate 103 is wrapped around the outside of the digestion chamber 102, and a first temperature sensor 104 is embedded between the heating plate 103 and the digestion chamber 102. The first temperature sensor 104 is used to detect the digestion reaction temperature in the digestion chamber 102 in real time. An ultraviolet lamp 101 is inserted into the digestion chamber 102, and the ultraviolet lamp 101 is coaxially arranged with the digestion chamber 102. The emission wavelength of the ultraviolet lamp 101 is ultra-short ultraviolet UVC. Ultraviolet rays have a catalytic effect on some chemical reactions, and can be used to digest total phosphorus and reduce the digestion reaction temperature without the need for additional pressurization. In the invention, the digestion chamber 102 adopts a hollow interlayer design, wherein the sample inlet of the digestion chamber 102 is connected to one end of the interlayer of the digestion chamber 102, and the liquid discharge port of the digestion chamber 102 is connected to the other end of the interlayer of the digestion chamber 102, and the sample injected into the digester 100 enters the interlayer for digestion reaction.

[0039] An insulating layer is coated on the outer wall of the digestion chamber 102 to isolate light and prevent ultraviolet light from leaking out. At the same time, a heat insulating layer can be wrapped around the outside of the overall digester 100 to prevent heat from the heating plate 103 from overflowing.

[0040] In the present invention, Figure 2 As shown, the ultraviolet lamp 101, the heating plate 103, and the first temperature sensor 104 are electrically connected to the single chip microcomputer, respectively, and the single chip microcomputer controls the operation of the ultraviolet lamp 101 and the heating plate 103. During the heating process, the first temperature sensor 104 is preset with a corresponding first set temperature for different measurement substances. The single chip microcomputer selects the first set temperature according to the corresponding electrical signal of the required detection sample received, and controls the heating plate 103 to heat. When the first temperature sensor 104 detects that the temperature in the digestion chamber 102 reaches the first set temperature, it generates an electrical signal and sends it to the single chip microcomputer. The single chip microcomputer controls the operating frequency of the heating plate 103 to ensure that the temperature in the digester 100 chamber is maintained at the preset temperature until the preset time is reached, and then the ultraviolet lamp 101 and the heating plate 103 are turned off.

[0041] like Figure 3As shown, the optical path system includes a first photometer 300 and a second photometer 400 .

[0042] The first photometer 300 includes a full spectrum detector 311, a light receiver 314 and a xenon lamp 312. The xenon lamp 312 is connected to the entrance of the full spectrum detector 311 by optical fiber, and the full spectrum detector 311 is also connected to the light receiver 314 by optical fiber. The full spectrum detector 311 includes a detector housing, in which a colorimetric cell 310, a converging lens 313 and a parallel lens 312 are arranged. The parallel lens 312 is arranged near the entrance of the detector housing, and the converging lens 313 is arranged near the exit of the detector housing. The colorimetric cell 310 is placed between the converging lens 313 and the parallel lens 312. The colorimetric cell 310 is also provided with a colorimetric cell overflow port for overflow of the colorimetric cell 310. After the xenon lamp 312 is turned on, the light emitted by the xenon lamp 312 reaches the entrance of the photometer through the optical fiber, and the light beam is converted into parallel light by the parallel lens 312 in the full spectrum detector 311. When the parallel light passes through the colorimetric cell 310 , part of the light is absorbed by the substance contained in the liquid in the colorimetric cell 310 , and the other part of the parallel light passes through the colorimetric cell 310 and is converged by the converging lens 313 to the optical fiber at the exit of the photometer, and is transmitted to the optical receiver 314 through the optical fiber at the exit.

[0043] The optical receiver 314 includes an optical receiver housing, a spectroscope and a photoelectric sensor array 316. A reflective cavity 315 for light beam reflection is provided in the optical receiver housing. An inlet for optical fiber insertion is provided on one side wall of the reflective cavity 315. The side wall where the inlet is located and the other side wall opposite to the side wall are set as arc-shaped side walls with the same radius of curvature, and the spectroscope is laid on the arc-shaped side wall. Accordingly, a plurality of photoelectric sensor arrays 316 are provided on the arc-shaped side wall where the inlet is located. Each photoelectric sensor array 316 is used to detect light beams of different wavelength bands. The specific position of each photoelectric sensor array 316 on the arc-shaped chamber is adjusted according to the inlet of the arc-shaped chamber, the curvature of the arc-shaped chamber, and the corresponding light beam wavelength band.

[0044] In the present invention, the wavelengths measured by the first photometer 300 and the second photometer 400 are different. Therefore, the wavelength of the band measured by the first photometer 300 exceeds 700 nanometers (suitable for measuring total phosphorus), while the wavelength of the band measured by the second photometer 400 is between 200 nanometers and 700 nanometers (suitable for measuring total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate or turbidity). Accordingly, the spectroscope and the photoelectric sensor array 316 of the light receiver 314 in each photometer are also adaptively adjusted according to the wavelength to be measured, so that the analyzer of the present invention can cover the measurement of the entire band through the cooperation of the first photometer and the second photometer.

[0045] The light receiver 314 can use a spectroscope to divide the received light into bands of different nanometer wavelengths, and project the light of different bands onto the corresponding photoelectric sensor array 316. The microcontroller collects the absorbance through the photoelectric sensor array 316. Since the concentration of the liquid substance in the colorimetric cell 310 is linearly proportional to the light absorbed by the specific band of the substance, the concentration of a certain substance in the solution can be inferred from the light energy absorbed by the specific band (i.e., absorbance). Among them, the bands corresponding to different substances to be measured are different, which will avoid interference from other substances to the substance to be measured. Then, the microcontroller obtains the specific measurement value based on the calibration coefficient set in advance, where the measurement value = calibration coefficient * absorbance. At the same time, the analyzer of the present invention can also compensate for the absorbance obtained at the 540nm band. When the absorbance obtained by the single-chip microcomputer from the photoelectric sensor array 316 is in the 540nm band, compensation is performed when calculating the measured value. The measured value = calibration coefficient * (absorbance - 540nm absorbance), so as to compensate for turbidity and chromaticity, thereby realizing anti-interference compensation.

[0046] It should be noted that before starting the measurement, each photometer can be calibrated to obtain a calibration coefficient, which is calibration coefficient = calibration liquid concentration / absorbance. Two three-way electric valves Y36 and Y37 can be selected in the electric valve group 600, and one end interface of the three-way electric valves Y36 and Y37 is directly connected to the calibration liquid container, and the calibration liquid in the calibration liquid container is respectively drawn into the first photometer 300 and the second photometer 400 to measure the absorbance of the calibration liquid, so as to obtain the calibration coefficient.

[0047] The analyzer's partition 900 constructs a measuring pipeline system for detecting six parameters, namely, total phosphorus, total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate, and turbidity, through a liquid pipeline, a peristaltic pump, a three-way solenoid valve, and a three-way electric valve. The following is a detailed description of the measuring pipeline system of the analyzer.

[0048] like Figure 1 As shown, the measuring pipeline system includes an electric valve group 600, the input end of the electric valve group 600 is connected to the sample container containing the sample, and the output end of the solenoid valve is connected to the input end of the first peristaltic pump P1. Further, the electric valve group 600 is composed of a plurality of three-way electric valves connected in series, and the three-way electric valves in the electric valve group 600 are arranged in a roughly array manner to form a compact arrangement. One interface of one or more three-way solenoid valves is selected as the input end, and at the same time, the sample container can be provided with a reagent bottle connected to the three-way solenoid valve as the input end.

[0049] In this embodiment, the analyzer can measure six parameters, such as Figure 1As shown, therefore, in addition to the three-way electric valves Y36 and Y37, the electric valve group 600 is also provided with at least 6 three-way electric valves connected in series for extracting samples, namely three-way electric valves Y30~Y35, and each of the three-way electric valves Y30~Y35 is connected to the corresponding sample container. It should be noted that when one of the samples is detected, only the three-way solenoid valve connected to the reagent bottle containing the sample is opened, and the other three-way solenoid valves connected in series with the three-way solenoid valve and the first peristaltic pump P1 on the liquid pipeline close their connection with the reagent bottle, and only ensure the connection with the liquid pipeline between the first peristaltic pump P1.

[0050] like Figure 1 , Figure 4 and Figure 5 As shown, the output end of the first peristaltic pump P1 is connected to the first three-way electric valve Y1, and the first three-way electric valve Y1 is also connected to the first three-way solenoid valve K1 through a liquid pipeline, and the first three-way solenoid valve K1 is connected to the inlet of the digester 100 through the second three-way solenoid valve K2, the third three-way solenoid valve K3, and the fourth three-way solenoid valve K4. The first peristaltic pump P1 extracts the sample required to measure total phosphorus or total nitrogen from the sample container and pumps it into the digester 100 for digestion reaction. In the present invention, the inlet of the digester 100 also serves as its outlet, and the sample still flows out from the inlet after digestion is completed.

[0051] The fourth three-way solenoid valve K4 is also connected to the third peristaltic pump P3 through a liquid pipeline. When the sample is digested, the fourth three-way solenoid valve K4 disconnects from the third three-way solenoid valve K3 and opens the connection with the third peristaltic pump P3. The third peristaltic pump P3 is started by the single-chip microcomputer to suck the digested sample in the digester 100.

[0052] Since the digestion process requires heating of the sample, the temperature of the digested sample is relatively high. In order to facilitate cooling of the digested sample, in the embodiment, Figure 1 , Figure 4 and Figure 5 As shown, a heat dissipation container 200 is also connected in series in the pipeline of the third peristaltic pump P3 and the fourth three-way solenoid valve K4, wherein the heat dissipation container 200 and the fourth three-way solenoid valve K4 are placed below the digester 100. When the sample digestion is completed, the fourth three-way solenoid valve K4 is opened, and the sample flows into the heat dissipation container 200 under the action of gravity. At this time, the two-way solenoid valve at the outlet of the heat dissipation container 200 is in a closed state.

[0053] The heat dissipation container 200 can be made of glass, and the inner diameter of the heat dissipation container 200 is significantly larger than the diameter of the pipe connected thereto. The digested sample flows into the heat dissipation container 200 under the action of gravity to dissipate heat. In one embodiment, a second temperature sensor for detecting the internal temperature of the heat dissipation container 200 can also be installed. The second temperature sensor is preset with a second set temperature and is electrically connected to a single-chip microcomputer. When the second temperature sensor detects that the temperature of the sample in the heat dissipation container 200 is lower than the second set temperature, an electrical signal is output to the single-chip microcomputer, and the single-chip microcomputer controls the two-way solenoid valve at the bottom of the heat dissipation container 200 to open. At the same time, the third peristaltic pump P3 is turned on to suck the sample in the heat dissipation container 200.

[0054] In order to control the flow rate of the sample flowing into the heat dissipation container 200 , a first two-way electric valve Y20 may be connected in series at the top input end of the heat dissipation container 200 .

[0055] In addition, it should be noted that before digestion of total phosphorus or total nitrogen, an oxidant needs to be added to the sample. Figure 1 , Figure 4 and Figure 5 As shown, the pipeline of the oxidant is connected to the oxidant container S8 through the pipeline from the input end of the second peristaltic pump P2 through the thirteenth three-way solenoid valve K13, and the output end of the second peristaltic pump P2 is connected to the second three-way solenoid valve K2. Before the sample is digested, the sample is mixed with the oxidant at the second three-way solenoid valve K2. In order to control the flow rate of the second peristaltic pump P2 pumping into the second three-way solenoid valve K2, a fourteenth three-way electric valve Y14 can be connected in series between the second peristaltic pump P2 and the second three-way solenoid valve K2.

[0056] like Figure 1 , the third peristaltic pump P3 is connected to the second three-way electric valve Y2 through a liquid pipeline, the second three-way electric valve Y2 is connected to the fifth three-way electric valve Y5, and the fifth three-way electric valve Y5 is also connected to the first pipeline 500 and the seventh three-way solenoid valve K7, respectively, wherein the seventh three-way solenoid valve K7 is connected to the input end of the second photometer 400. The first pipeline 500 is provided with a color reagent for extracting the total phosphorus measurement, and the other side of the first pipeline 500 is also connected to the first photometer 300. In this embodiment, the first photometer 300 and the second photometer 400 measure different photosensitivity ranges. The first photometer 300 is suitable for measuring total phosphorus, and the second photometer 400 is suitable for measuring total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate, and turbidity.

[0057] The first pipeline 500 contains a ninth peristaltic pump P9 and a tenth peristaltic pump P10, which are respectively connected to a first reagent bottle S1 and a second reagent bottle S2 containing a color developer for measuring total phosphorus. The ninth peristaltic pump P9 and the tenth peristaltic pump P10 are also respectively connected to a fifth three-way solenoid valve K5 and a thirteenth three-way solenoid valve K13 at their output ends, wherein the thirteenth three-way solenoid valve K13 is also respectively connected to a fifth three-way electric valve Y5 and a fifth three-way solenoid valve K5, and the fifth three-way solenoid valve K5 is directly connected to the input end of the first photometer 300. When measuring total phosphorus, when the sample is pumped into the fifth three-way electric valve Y5 by the third peristaltic pump P3, the ninth peristaltic pump P9 and the tenth peristaltic pump P10 start to suck the color developer in the first reagent bottle S1 and the second reagent bottle S2 under the control of the single-chip microcomputer, and mix the sample and the color developer at the fifth three-way solenoid valve K5 and pump them into the first photometer 300. The output end of the first photometer 300 is connected to the fourteenth three-way solenoid valve K14 of the discharge pipe through a pipeline.

[0058] In one embodiment, in order to facilitate the subsequent cleaning of the pipeline between the first photometer 300 and the first pipeline 500, the first photometer 300 is placed above the first pipeline 500, and the pipeline between the first photometer 300 and the first pipeline 500 is arranged at a right angle, such as Figure 1 and Figure 4 As shown, a sixth three-way solenoid valve K6 is connected in series at a right angle, and an interface of the sixth three-way solenoid valve K6 is also connected to the second two-way electric valve Y21. The second two-way electric valve Y21 is directly connected to the drain pipe. When cleaning the pipeline, gravity is directly used to make the sample in the first photometer 300 flow into the drain pipe.

[0059] In the present invention, Figure 1 and Figure 5 As shown, the second three-way electric valve Y2 is also connected to the third three-way solenoid valve K3. When measuring total nitrogen, the digested sample needs to be mixed with a color developer used to measure total nitrogen. The second pipeline 700 is provided with a color developer required for extracting the total nitrogen. The second pipeline 700 includes a fourth peristaltic pump P4 and a fifth peristaltic pump P5 installed near the second peristaltic pump P2. The fourth peristaltic pump P4 and the fifth peristaltic pump P5 are respectively connected to the sixth reagent bottle S6 and the seventh reagent bottle S7 containing the color developer used to measure total nitrogen. In order to make the internal structure of the analyzer more compact, the second peristaltic pump P2, the fourth peristaltic pump P4, and the fifth peristaltic pump P5 can share a section of liquid pipeline to connect the oxidant container S8, the sixth reagent bottle S6, and the seventh reagent bottle S7.

[0060] like Figure 1 and Figure 5As shown, the fourth peristaltic pump P4 and the fifth peristaltic pump P5 are also connected to the sixth three-way solenoid valve K6, and the sixth three-way solenoid valve K6 is also connected to the first three-way solenoid valve K1. When the sample for measuring total nitrogen is digested, it is pumped to the second three-way electric valve Y2 by the third peristaltic pump P3. At the same time, the color developer in the sixth reagent bottle S6 and the seventh reagent bottle S7 is sucked by the fourth peristaltic pump P4 and the fifth peristaltic pump P5 and mixed at the sixth three-way solenoid valve K6 and pumped into the second three-way electric pump through the first three-way solenoid valve K1, the second three-way solenoid valve K2 and the third three-way solenoid valve K3, and then pumped into the second photometer 400 through the fifth three-way electric pump and the seventh three-way solenoid valve K7. The output end of the second photometer 400 is connected to the fifteenth three-way solenoid valve K15 of the discharge pipe through a pipeline.

[0061] When measuring ammonia nitrogen, the sample does not need to be digested, so if Figure 1 and Figure 6 As shown, in the present invention, the first three-way electric valve Y1 is connected to the sixth three-way electric valve, and the sixth three-way electric valve Y6 is also connected to the third pipeline 800. The third pipeline 800 is provided with a reagent for extracting the reagent required for measuring ammonia nitrogen. The other side of the third pipeline 800 is connected to the eleventh three-way solenoid valve K11 through a liquid pipeline, and the eleventh three-way solenoid valve K11 is connected to the seventh three-way solenoid valve K7.

[0062] To facilitate the subsequent cleaning of the pipeline between the second photometer 400 and the third pipeline 800, the second photometer 400 is placed above the third pipeline 800, the pipeline between the eleventh three-way solenoid valve K11 and the third pipeline 800 is set at a right angle, and the twelfth three-way solenoid valve K12 is connected in series at the right angle, and one interface of the twelfth three-way solenoid valve K12 is the eleventh three-way solenoid valve K11, and the twelfth three-way electric valve is directly connected to the drain pipe through the third two-way electric valve Y22. When cleaning the pipeline, gravity is directly used to make the sample in the second photometer 400 flow into the drain pipe.

[0063] like Figure 1 and Figure 6As shown, the third pipeline 800 includes the sixth peristaltic pump P6, the seventh peristaltic pump P7 and the eighth peristaltic pump P8. To further make the internal structure of the analyzer more compact, the sixth peristaltic pump P6, the seventh peristaltic pump P7 and the eighth peristaltic pump P8 share a common end of the liquid pipeline to connect the third reagent bottle S3, the fourth reagent bottle S4 and the fifth reagent bottle S5 containing the corresponding color developer. The output end of the sixth peristaltic pump P6 is connected to the eighth three-way solenoid valve K8, and the eighth three-way solenoid valve K8 is also connected to the sixth three-way electric valve Y6 and the ninth three-way solenoid valve K9 respectively. The output ends of the seventh peristaltic pump P7 and the eighth peristaltic pump P8 are respectively connected to the ninth three-way solenoid valve K9 and the thirteenth solenoid valve K10, wherein the ninth three-way solenoid valve K9 is also connected to the thirteenth solenoid valve K10, and an ammonia nitrogen heater (not shown in the figure) can also be connected in series between the thirteenth solenoid valve K10 and the eleventh three-way solenoid valve K11 to heat the sample during measurement. The three reagents required for the ammonia nitrogen test are respectively pumped by the sixth peristaltic pump P6, the seventh peristaltic pump P7 and the eighth peristaltic pump P8, and then mixed at the thirteenth solenoid valve K10 and pumped into the second photometer 400 through the eleventh three-way solenoid valve K11 and the seventh three-way solenoid valve K7.

[0064] When measuring chemical oxygen demand (COD), nitrate, and turbidity, the samples only need to be directly pumped into the second photometer 400. Therefore, in the present invention, Figure 1 and Figure 7 As shown, the sixth three-way electric pump is directly connected to the eleventh three-way electromagnetic valve K11 through a liquid pipeline. At this time, the first peristaltic pump P1 draws the sample from the electric valve group 600 and pumps it into the second photometer 400 through the eleventh three-way electromagnetic valve K11 and the seventh three-way electromagnetic valve K7.

[0065] According to the above pipeline system, the pipelines involved are explained for the six parameters of total phosphorus, total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate and turbidity:

[0066] like Figure 4 As shown, the total phosphorus measurement process is as follows:

[0067] Pipeline cleaning steps: turn on the first peristaltic pump P1 to extract samples from the sample container. The electric valve group 600 controls the flow rate of the sample being sucked. The sample is injected into the digester 100 and the pipelines involved in measuring total phosphorus by the first peristaltic pump P1, taking away the original impurities in the pipelines, and flowing to the drainage pipeline to complete the cleaning.

[0068] Digestion step: Turn on the first peristaltic pump P1 again, the sample in the sample container is extracted through the electric valve group 600, and then the first peristaltic pump P1 is pumped to the second three-way solenoid valve K2 through the first three-way solenoid valve K1 and the first three-way solenoid valve K1. At the same time, the second peristaltic pump P2 extracts the oxidant from the oxidant container S8, and then pumps it to the second three-way solenoid valve K2 through the fourteenth three-way electric valve. Therefore, the sample and the oxidant are mixed at the second three-way solenoid valve to obtain a mixed solution, and the mixed solution is injected into the digester 100 through the third three-way solenoid valve K3 and the fourth three-way solenoid valve K4 for digestion reaction. The digestion chamber 102 is heated to the first set temperature by the heating plate 103. In the present invention, the first set dimension is 90 degrees Celsius, so that the temperature in the digestion chamber 102 maintains the first set temperature. At the same time, the ultraviolet lamp 101 is turned on for digestion for 15 minutes. After 15 minutes, the ultraviolet lamp 101 and the heating plate 103 are turned off, the digestion reaction is completed, and a digestion solution of the water sample is obtained.

[0069] Cooling step: Open the fourth three-way solenoid valve K4 at the bottom of the digester 100, and under the action of gravity, the digestion liquid falls into the heat dissipation container 200 through the fourth three-way solenoid valve K4. After the heat is dissipated to the second set temperature in the heat dissipation container 200, open the two-way solenoid valve at the bottom of the heat dissipation container 200.

[0070] Total phosphorus measurement steps: The third peristaltic pump P3 is turned on to suck the digestion solution, and then pumped to the first pipeline 500 through the second three-way electric valve Y2 and the fifth three-way electric valve Y5. The ninth peristaltic pump P9 and the tenth peristaltic pump P10 in the first pipeline 500 work together to extract the two display agents required for total phosphorus from the first reagent bottle S1 and the second reagent bottle S2, and mix them with the sample at the fifth three-way electromagnetic valve K5. After mixing, they are pumped into the colorimetric cell 310 of the first photometer 300. The absorbance information of the first photometer 300 is read by the single chip microcomputer through the photoelectric sensor array 316, and the specific total phosphorus measurement value is calculated by comparing with the calibration curve.

[0071] like Figure 5 As shown, the total nitrogen measurement test process is as follows:

[0072] Pipeline cleaning steps: turn on the first peristaltic pump P1 to extract samples from the sample container. The electric valve group 600 controls the flow rate of the sample being sucked. The sample is injected into the digester 100 and the pipelines involved in measuring total phosphorus by the first peristaltic pump P1, taking away the original impurities in the pipelines, and flowing to the drainage pipeline to complete the cleaning.

[0073] Digestion step: Turn on the first peristaltic pump P1 again, the sample in the sample container is extracted through the electric valve group 600, and then the first peristaltic pump P1 is pumped to the second three-way solenoid valve K2 through the first three-way solenoid valve K1 and the first three-way solenoid valve K1. At the same time, the second peristaltic pump P2 extracts the oxidant from the oxidant container S8, and then pumps it to the second three-way solenoid valve K2 through the fourteenth three-way electric valve. Therefore, the sample and the oxidant are mixed at the second three-way solenoid valve to obtain a mixed solution, and the mixed solution is injected into the digester 100 through the third three-way solenoid valve K3 and the fourth three-way solenoid valve K4 for digestion reaction. The digestion chamber 102 is heated to the first set temperature by the heating plate 103. In the present invention, the first set dimension is 90 degrees Celsius, so that the temperature in the digestion chamber 102 maintains the first set temperature. At the same time, the ultraviolet lamp 101 is turned on for digestion for 15 minutes. After 15 minutes, the ultraviolet lamp 101 and the heating plate 103 are turned off, the digestion reaction is completed, and a digestion solution of the water sample is obtained.

[0074] Cooling step: Open the fourth three-way solenoid valve K4 at the bottom of the digester 100, and under the action of gravity, the digestion liquid falls into the heat dissipation container 200 through the fourth three-way solenoid valve K4. After the heat is dissipated to the second set temperature in the heat dissipation container 200, open the two-way solenoid valve at the bottom of the heat dissipation container 200.

[0075] Total phosphorus measurement steps: The third peristaltic pump P3 is turned on to pump the digestion solution to the second three-way electric valve Y2. At the same time, the fourth peristaltic pump P4 and the fifth peristaltic pump P5 in the second pipeline 700 work together to extract the two color developing agents required for total nitrogen from the sixth reagent bottle S6 and the seventh reagent bottle S7, and mix them with the color developing agents at the sixth three-way solenoid valve K6. After mixing, the sample is pumped to the second three-way electric valve Y2 through the second three-way solenoid valve K2 and the third three-way solenoid valve K3. At this time, the sample and the two color developing reagents are mixed at the second three-way electric valve Y2, and then pumped into the colorimetric cell 310 of the second photometer 400 through the fifth three-way electric pump and the seventh three-way solenoid valve K7. The absorbance information of the second photometer 400 is read by the single chip microcomputer through the photoelectric sensor array 316, and the specific total nitrogen measurement value is calculated by comparing with the calibration curve.

[0076] like Figure 6 As shown, the ammonia nitrogen measurement test process is as follows:

[0077] Pipeline cleaning steps: Open the first peristaltic pump P1 to extract samples from the sample container. The electric valve group 600 controls the flow rate of the sample being sucked. The sample is pumped into the pipeline involved in measuring ammonia nitrogen by the first peristaltic pump P1, taking away the original impurities in the pipeline, and flowing to the drainage pipeline to complete the cleaning.

[0078] Ammonia nitrogen measurement steps: start the first peristaltic pump P1 again, extract the sample, and pump the sample into the eighth three-way solenoid valve K8 of the third pipeline 800 through the first three-way electric valve Y1 and the sixth three-way electric valve Y6. The sixth peristaltic pump P6, the seventh peristaltic pump P7 and the eighth peristaltic pump P8 in the third pipeline 800 work together to extract the three reagents required for ammonia nitrogen measurement and pump them to the thirteenth solenoid valve K10. The sample is mixed with the three reagents at the thirteenth solenoid valve K10, and after mixing, it is pumped into the ammonia nitrogen heater for heating for 3 minutes, and then pumped into the colorimetric cell 310 of the second photometer 400 through the eleventh three-way solenoid valve K11 and the seventh three-way solenoid valve K7. The absorbance information of the second photometer 400 is read by the single chip microcomputer through the photoelectric sensor array 316, and the specific ammonia nitrogen measurement value is calculated by comparing with the calibration curve.

[0079] like Figure 7 As shown, the test process of chemical oxygen demand (COD), nitrate and turbidity is as follows:

[0080] Pipeline cleaning steps: Open the first peristaltic pump P1 to extract samples from the sample container. The electric valve group 600 controls the flow rate of the sample being sucked. The sample is pumped into the pipeline involved in the measurement by the first peristaltic pump P1, taking away the original impurities in the pipeline, and flowing to the drainage pipeline to complete the cleaning.

[0081] Measuring steps: Start the first peristaltic pump P1 again, extract the sample, and pump the sample into the colorimetric cell 310 of the second photometer 400 through the first three-way electric valve Y1, the sixth three-way electric valve Y6, the eleventh three-way solenoid valve K11, and the seventh three-way solenoid valve K7. The absorbance information of the second photometer 400 is read by the single chip microcomputer through the photoelectric sensor array 316, and the specific chemical oxygen demand (COD), nitrate or turbidity test measurement value is calculated by comparing with the calibration curve.

[0082] During the measurement process, before each measurement, the measurement pipelines involved in the analyzer need to be cleaned to avoid cross contamination and ensure the accuracy of the measurement.

[0083] In summary, the analyzer of the present invention can measure six parameters, namely, total phosphorus, total nitrogen, ammonia nitrogen, chemical oxygen demand (COD), nitrate, and turbidity. When measuring multiple parameters, common components can be shared and the measurements will not interfere with each other, so that the measuring pipelines can be placed in the same casing, with a compact structure.

[0084] It effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A multi-parameter water quality online analyzer, characterized in that: include: A first peristaltic pump, an input end of which is connected to an output end of the electric valve group, and an input end of the electric valve group is connected to a sample container containing a measurement sample; A first three-way electric valve is connected to the output end of the first peristaltic pump; the first three-way electric valve is connected to the inlet of the digester via a first three-way solenoid valve, a second three-way solenoid valve, a third three-way solenoid valve, and a fourth three-way solenoid valve; A third peristaltic pump, whose input end is connected to the fourth three-way solenoid valve, and whose output end is connected to the second three-way electric valve; the second three-way electric valve is also connected to the third three-way solenoid valve; A first pipeline is provided for extracting a colorimetric reagent required for measuring total phosphorus, one side of the first pipeline is connected to the second three-way electric valve via a fifth three-way electric valve, the other side of the first pipeline is connected to a first photometer, the fifth three-way electric valve is further connected to a second photometer via a seventh three-way solenoid valve, and the first photometer and the second photometer are further connected to drainage pipes respectively; a second peristaltic pump, an input end of which is connected to the oxidant container, and an output end of which is connected to the second three-way solenoid valve; A second pipeline is provided for extracting a color developing reagent required for measuring total nitrogen, and the second pipeline is connected to the first three-way solenoid valve; The single chip microcomputer is used to control the electrical components in the analyzer. The analyzer also includes: a third pipeline, which is used to extract reagents required for measuring ammonia nitrogen, One side of the third pipeline is connected to the first three-way electric valve through the sixth three-way electric valve, and the other side of the third pipeline is connected to the seventh three-way solenoid valve via the eleventh three-way solenoid valve. The sixth three-way electric valve is also directly connected to the eleventh three-way solenoid valve. The first pipeline comprises a ninth peristaltic pump and a tenth peristaltic pump, and the ninth peristaltic pump and the tenth peristaltic pump are respectively connected to a first reagent bottle and a second reagent bottle containing a color developer for measuring total phosphorus, The ninth peristaltic pump and the tenth peristaltic pump are also connected to the fifth three-way solenoid valve and the thirteenth three-way solenoid valve at their output ends respectively. The thirteenth three-way solenoid valve is also connected to the fifth three-way electric valve and the fifth three-way solenoid valve respectively. The fifth three-way solenoid valve is connected to the input end of the first photometer. The second pipeline includes a fourth peristaltic pump and a fifth peristaltic pump installed near the second peristaltic pump. The fourth peristaltic pump and the fifth peristaltic pump are respectively connected to a sixth reagent bottle and a seventh reagent bottle containing a color developer for measuring total nitrogen. The fourth peristaltic pump and the fifth peristaltic pump are also respectively connected to a sixth three-way solenoid valve, and the sixth three-way solenoid valve is also connected to the first three-way solenoid valve. The third pipeline comprises a sixth peristaltic pump, a seventh peristaltic pump and an eighth peristaltic pump, wherein the sixth peristaltic pump, the seventh peristaltic pump and the eighth peristaltic pump are connected to a third reagent bottle, a fourth reagent bottle and a fifth reagent bottle containing corresponding color developers, The output end of the sixth peristaltic pump is connected to the eighth three-way solenoid valve, and the eighth three-way solenoid valve is also connected to the sixth three-way electric valve and the ninth three-way solenoid valve, respectively. The output ends of the seventh peristaltic pump and the eighth peristaltic pump are respectively connected to the ninth three-way solenoid valve and the thirteenth way solenoid valve, respectively. The ninth three-way solenoid valve is also connected to the thirteenth way solenoid valve, and the thirteenth way solenoid valve is also connected to the eleventh three-way solenoid valve.

2. The multi-parameter water quality online analyzer according to claim 1, characterized in that: An ultraviolet lamp is arranged in the digester.

3. The multi-parameter water quality online analyzer according to claim 2, characterized in that: The ultraviolet lamp emits an ultra-short ultraviolet light, UVC.

4. The multi-parameter water quality online analyzer according to claim 1, characterized in that: A heat dissipation container is also connected in series on the pipeline between the third peristaltic pump and the fourth three-way solenoid valve, and the heat dissipation container is placed at the bottom of the digester.

5. The multi-parameter water quality online analyzer according to claim 4, characterized in that: The inner cavity diameter of the heat dissipation container is larger than the diameter of the pipeline connected thereto.

6. The multi-parameter water quality online analyzer according to claim 1, characterized in that: The first photometer comprises: Xenon lamp; A full-spectrum detector is connected to the xenon lamp by an optical fiber, the full-spectrum detector is provided with a detector housing, and a colorimetric cell, a parallel lens and a convergent lens disposed in the detector housing, the colorimetric cell is disposed between the parallel lens and the convergent lens, and a liquid inlet and an overflow port of the colorimetric cell are connected to the fifth three-way solenoid valve and the liquid discharge pipe respectively; The optical receiver is connected to the full-spectrum detector by optical fiber. A reflection cavity for light beam reflection is arranged inside the optical receiver. A photoelectric sensor array is arranged on the side wall of the reflection cavity. The photoelectric sensor array is electrically connected to the single-chip microcomputer in the analyzer.

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