Water quality analyzer and liquid path cleaning method of water quality analyzer

Abstract

The present invention discloses a water quality analyzer and a method for cleaning a liquid circuit of the water quality analyzer, wherein the water quality analyzer comprises a water circuit board assembly, a peristaltic pump, a three-way valve and a colorimetric assembly, the water circuit board assembly comprises a water circuit board and a plurality of solenoid valves installed on the water circuit board, the water circuit board is provided with a flow channel, a water sample interface, a reagent interface, a cleaning liquid interface and a fluid outlet, the solenoid valve is used to control the on-off of each interface and the flow channel; the peristaltic pump is connected to the fluid outlet; the three-way valve comprises an inlet, a first outlet and a second outlet, the inlet is connected to the peristaltic pump, the first outlet is used to discharge waste liquid after cleaning the water circuit board assembly; the colorimetric assembly is connected to the second outlet, the colorimetric assembly is used for digestion and absorbance detection of water samples; wherein the water circuit board assembly is also provided with a waste outlet, the waste outlet is used to discharge waste liquid after cleaning the colorimetric assembly. In the water quality analyzer disclosed by the present invention, the waste liquid used to clean the water circuit board assembly will not pollute the colorimetric assembly, and the accuracy of the detection result can be improved.

Description

Technical Field

[0001] The invention relates to the field of water quality detection, in particular to a water quality analyzer and a liquid path cleaning method of the water quality analyzer. Background Art

[0002] Nutrients are the material basis necessary for the growth of marine phytoplankton. The different concentrations and compositions of nutrients in seawater affect the primary productivity of the ocean, regulate the community structure of phytoplankton, and thus affect the structure of the marine ecosystem. In normal seawater, an appropriate amount of nutrients can promote the reproduction and growth of organisms, but excessive nutrients can cause some marine organisms to reproduce rapidly, thereby consuming a large amount of dissolved oxygen in seawater, causing hypoxia in seawater, and causing the death of a large number of fish, shrimps, crabs, and shellfish. The pollution of the ocean by organic matter and nutrients is now called "eutrophication." Understanding the temporal and spatial distribution and changes of nutrients in the ocean is of great significance for understanding the key processes of the marine ecosystem, evaluating and controlling the eutrophication of marine water bodies. Nutrients in seawater are essential components for the growth and reproduction of marine phytoplankton, and are also the basis of marine primary productivity and food chains. Therefore, the content of nutrients in seawater is an important parameter for monitoring the marine ecological environment and one of the routine marine items for marine monitoring.

[0003] Based on this, a variety of water quality analyzers have appeared on the market, which are used to analyze the nutrient salt content in water. The water quality analyzers need to clean the liquid circuit before testing the water sample. The cleaning system of the existing water quality analyzers is prone to residual impurities in the liquid circuit, resulting in inaccurate measurement data. Summary of the invention

[0004] In view of this, the present invention discloses a water quality analyzer and a liquid path cleaning method of the water quality analyzer.

[0005] A first aspect of the present invention discloses a water quality analyzer, comprising:

[0006] A waterway plate assembly, the waterway plate assembly comprising a waterway plate and a plurality of solenoid valves mounted on the waterway plate, the waterway plate being provided with a flow channel, a water sample interface, a reagent interface, a cleaning liquid interface and a fluid outlet, the solenoid valve being used to control the connection or disconnection of each interface with the flow channel;

[0007] a peristaltic pump connected to the fluid outlet;

[0008] A three-way valve, the three-way valve comprising an inlet, a first outlet and a second outlet, the inlet being connected to the peristaltic pump, and the first outlet being used to discharge waste liquid after cleaning the waterway plate assembly;

[0009] A colorimetric component, the colorimetric component is connected to the second outlet, and the colorimetric component is used for absorbance detection of the water sample;

[0010] Wherein, the waterway plate assembly is also provided with a waste outlet, and the waste outlet is used to discharge the waste liquid after cleaning the colorimetric assembly.

[0011] The second aspect of the present invention discloses a method for cleaning the liquid circuit of a water quality analyzer, wherein the water quality analyzer comprises a water circuit board assembly, a peristaltic pump, a three-way valve and a colorimetric assembly, wherein the water circuit board assembly comprises a water circuit board and a plurality of solenoid valves installed on the water circuit board, wherein the water circuit board is provided with a flow channel, a water sample interface, a reagent interface, a cleaning liquid interface and a fluid outlet, wherein the solenoid valve is used to control the connection or disconnection between each interface and the flow channel; the peristaltic pump is connected to the fluid outlet; the three-way valve comprises an inlet, a first outlet and a second outlet, wherein the inlet is connected to the peristaltic pump; the colorimetric assembly is connected to the second outlet, and the colorimetric assembly is used for absorbance detection of water samples; the water circuit board assembly is also provided with a waste outlet; the method for cleaning the liquid circuit of the water quality analyzer comprises:

[0012] Receive cleaning signal;

[0013] The second outlet of the three-way valve is closed, and the peristaltic pump draws cleaning liquid through the cleaning liquid interface to clean the waterway plate assembly, and the waste liquid after cleaning is discharged from the first outlet of the three-way valve;

[0014] The first outlet of the three-way valve is closed, and the peristaltic pump draws cleaning liquid through the cleaning liquid interface to clean the colorimetric component. After cleaning, the peristaltic pump is reversed, and the waste liquid flows from the colorimetric component to the waterway plate component and is discharged from the waste outlet.

[0015] It can be seen from the above technical solution that the water quality analyzer disclosed in the present invention, by setting a three-way valve, the waste liquid after cleaning the water circuit board assembly is discharged from the first outlet of the three-way valve, and the waste liquid after cleaning the colorimetric assembly is discharged from the waste outlet, that is, the waste liquid after cleaning the water circuit board assembly will not pass through the colorimetric assembly, and will not cause pollution to the colorimetric assembly, thereby improving the accuracy of the detection result. In addition, the cross-sectional area of ​​the flow channel of the water circuit board is small, so that the amount of reagent used and discharged is small, which can save resources and reduce pollution. Moreover, there is less reagent residue, which can effectively reduce cross-contamination and improve the accuracy of the measurement results. Furthermore, compared with the existing method of using a multi-way valve, the water circuit board is smaller in size, which can effectively reduce the volume of the entire water quality analyzer and reduce the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained like these accompanying drawings without paying any creative work.

[0017] Figure 1 It is a process schematic diagram of the water quality analyzer provided by the first aspect of the present invention;

[0018] Figure 2 It is a schematic diagram of the flow channel and interface of the waterway plate provided by the first aspect of the present invention;

[0019] Figure 3 is a schematic structural diagram of a water quality analyzer provided by the first aspect of the present invention;

[0020] Figure 4 yes Figure 3 An exploded schematic diagram of the structure shown in;

[0021] Figure 5 is a block diagram of a liquid path cleaning method for a water quality analyzer provided in the second aspect of the present invention;

[0022] Figure 6 is a block diagram of a water quality analysis method of a water quality analyzer provided by a third aspect of the present invention;

[0023] Figure 7 yes Figure 6 A detailed schematic diagram of the first sub-step in the water quality analysis method of the water quality analyzer shown in ;

[0024] Figure 8 yes Figure 6 Another detailed schematic diagram of the first sub-step in the water quality analysis method of the water quality analyzer shown in ;

[0025] Fig. 9 yes Figure 6 Detailed schematic diagram of the second sub-step in the water quality analysis method of the water quality analyzer shown in . DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] See also Figure 1-2In a first aspect of the present invention, a water quality analyzer is provided, which includes a waterway board assembly 10, a peristaltic pump 20, a three-way valve 30 and a colorimetric assembly 40. The waterway board assembly 10 includes a waterway board 11 and a plurality of solenoid valves (not shown) installed on the waterway board. The waterway board 11 is provided with a flow channel 111, a water sample interface 112, a reagent interface 113, a cleaning liquid interface 114 and a fluid outlet 115. The solenoid valve is used to control the connection or disconnection of each interface with the flow channel 111. The peristaltic pump 20 is connected to the fluid outlet 115, the three-way valve 30 includes an inlet 31, a first outlet 32 ​​and a second outlet 33, the inlet 31 is connected to the peristaltic pump 20, the first outlet 32 ​​is used to discharge the waste liquid after cleaning the waterway plate assembly 10, the colorimetric assembly 40 is connected to the second outlet 33, and the colorimetric assembly 40 is used for absorbance detection of water samples; wherein the waterway plate assembly 10 is further provided with a waste outlet 116, and the waste outlet 116 is used to discharge the waste liquid after cleaning the colorimetric assembly 40. Specifically, the waste liquid after cleaning the colorimetric assembly 40 can be run to the waste outlet 116 by the peristaltic pump 20 in a reverse manner and discharged from the waste outlet 116.

[0029] After adopting the above technical solution, by setting the three-way valve 30, the waste liquid after cleaning the water circuit board assembly 10 is discharged from the first outlet 32 ​​of the three-way valve 30, and the waste liquid after cleaning the colorimetric assembly 40 is discharged from the waste outlet 116, that is, the waste liquid after cleaning the water circuit board assembly 10 will not pass through the colorimetric assembly 40, and will not cause pollution to the colorimetric assembly 40, thereby improving the accuracy of the detection result. In addition, the cross-sectional area of ​​the flow channel of the water circuit board 11 is small, so that the amount of reagent used and discharged is small, which can save resources and reduce pollution. Moreover, there is less reagent residue, which can effectively reduce cross-contamination and improve the accuracy of the measurement results. Furthermore, compared with the existing method of using a multi-way valve, the water circuit board 11 is smaller in size, which can effectively reduce the volume of the entire water quality analyzer and reduce the occupied space.

[0030] The water quality analyzer proposed in the present invention can be used to analyze the contents of components such as ammonia nitrogen, total nitrogen, total phosphorus, silicate, phosphate, nitrate, nitrite and CODmn (permanganate index) in water samples.

[0031] In an optional embodiment, the waterway plate 11 is made of acrylic material. Acrylic material is easy to clean, not easy to leave residual reagents, and can effectively reduce cross contamination. Of course, the material of the waterway plate is not limited to acrylic material, and other materials such as metal and ceramic can also be used.

[0032] In an optional embodiment, the water circuit plate 11 is provided with several groups of three-way interfaces 12, each group of three-way interfaces 12 includes a common interface 121, a left interface 122 and a right interface 123, and the solenoid valve is used to control the left interface 122 or the right interface 123 to be connected to the common interface 121; several groups of three-way interfaces 12 are connected in series by the flow channel 111, wherein the common interface 121 of the previous group is connected to the left interface 122 or the right interface 123 of the latter group, and the remaining left interface 122 or right interface 123 is selectively used as a water sample interface or a cleaning liquid interface or a reagent interface, and the common interface 121 of the last group of three-way interfaces 12 is connected to the peristaltic pump 20.

[0033] In an optional embodiment, the left interface 122 or the right interface 123 of the last set of three-way interfaces 12 is used as the waste outlet 116. In this design, by using the left interface or the right interface of the last set of three-way interfaces as the waste outlet, the waste liquid after cleaning the colorimetric component 40 will not pass through the previous sets of three-way interfaces and flow channels, effectively avoiding cross contamination.

[0034] In an optional embodiment, the cleaning liquid interface 114 includes a pure water interface 1141 and a cleaning agent interface 1142, one of the left interface 122 and the right interface 123 of the first group of three-way interfaces 12 is used as the cleaning agent interface 1142, and one of the left interface 122 and the right interface 123 of the second group of three-way interfaces 12 is used as the pure water interface 1141. In this design, by using one of the left interface 122 and the right interface 123 of the first group of three-way interfaces 12 as the cleaning agent interface 1142, when the waterway plate assembly 10 and the colorimetric assembly 40 are cleaned, the cleaning agent can pass through the flow channel of the entire waterway plate assembly 10 to the maximum extent, thereby cleaning the entire waterway plate assembly 10 and avoiding the residual liquid from affecting the detection results. Similarly, by using one of the left interface 122 and the right interface 123 of the second group of three-way interfaces 12 as the pure water interface 1141 is also based on the above considerations, which will not be repeated here.

[0035] In an optional embodiment, the waterway plate 11 is further provided with an air interface 117, and the other of the left interface 122 and the right interface 123 of the first set of three-way interfaces 12 is used as the air interface 117. The air interface 117 is used to blow air into the waterway plate 11 to drive the liquid in the waterway plate 11 into the colorimetric component 40. In this design, by using the other of the left interface 122 and the right interface 123 of the first set of three-way interfaces 12 as the air interface 117, the air can maximize the liquid in the flow channel 111 to be blown into the colorimetric component 40, reduce the residual liquid in the flow channel, and effectively avoid cross contamination.

[0036] In an optional embodiment, the waterway plate 11 is further provided with a standard liquid interface 118, and the standard liquid interface 118 is used to connect a standard liquid tank, and the standard liquid is used for calibration of the detected component before detection.

[0037] Exemplarily, the waterway plate 11 is provided with twelve groups of three-way interfaces, and the twelve groups of three-way interfaces are arranged in two columns. Optionally, each column is provided with six groups of three-way interfaces. The common interface of the first group of three-way interfaces 12a is connected to the left interface of the second group of three-way interfaces 12b, the left interface of the first group of three-way interfaces 12a is used as an air interface, and the right interface of the first group of three-way interfaces 12a is used as a cleaning liquid interface; the common interface of the second group of three-way interfaces 12b is connected to the left interface of the third group of three-way interfaces 12c, and the right interface of the second group of three-way interfaces 12b is used as a pure water interface; the common interface of the third group of three-way interfaces 12c is connected to the left interface of the fourth group of three-way interfaces 12d, and the third group of three-way interfaces The right interface of 12c is used as a water sample interface; the common interface of the fourth group of three-way interfaces 12d is connected to the left interface of the fifth group of three-way interfaces 12e, and the right interface of the fourth group of three-way interfaces 12d is used as a standard liquid interface; the common interface of the fifth group of three-way interfaces 12e is connected to the left interface of the sixth group of three-way interfaces 12f, and the right interface of the fifth group of three-way interfaces 12e is used as a first reagent interface; the common interface of the sixth group of three-way interfaces 12f is connected to the right interface of the seventh group of three-way interfaces 12g, and the right interface of the sixth group of three-way interfaces 12f is used as a first reagent interface. The interface is used as the second reagent interface; the common interface of the seventh group of three-way interfaces 12g is connected to the right interface of the eighth group of three-way interfaces 12h, and the left interface of the seventh group of three-way interfaces 12g is used as the third reagent interface; the common interface of the eighth group of three-way interfaces 12h is connected to the right interface of the ninth group of three-way interfaces 12i, and the left interface of the eighth group of three-way interfaces 12h is used as the fourth reagent interface; the common interface of the ninth group of three-way interfaces 12i is connected to the right interface of the tenth group of three-way interfaces 12j, and the left interface of the ninth group of three-way interfaces 12i is used as the fourth reagent interface. It is used as the fifth reagent interface; the middle interface of the tenth group of three-way interfaces 12j is connected to the right interface of the eleventh group of three-way interfaces 12k, and the left interface of the tenth group of three-way interfaces 12j is used as the second reagent interface; the common interface of the eleventh group of three-way interfaces 12k is connected to the right interface of the twelfth group of three-way interfaces 12l, and the left interface of the eleventh three-way interface 12k is used as a spare interface; the common interface of the twelfth group of three-way interfaces 12l is used as a fluid outlet, and the left interface of the twelfth group of three-way interfaces 12l is used as a waste outlet.

[0038] It should be noted that when the water quality analyzer is used to detect the content of two nutrients, nitrate and nitrite, the left interface of the eleventh three-way interface 12k can be connected to a UV digestion tube or a cadmium column, and the UV digestion tube and the cadmium column are used to reduce nitrate to nitrite.

[0039] It should also be noted that not all of the six reagent interfaces may be used. Depending on actual usage, only four of the reagent interfaces may be used, with the remaining two reagent interfaces being used as backup.

[0040] In an optional embodiment, the colorimetric component 40 includes a transparent tube 41, a light source 42 and a photoelectric converter 43. The transparent tube 41 is connected to the second outlet 33. The light source 42 is arranged on one side of the transparent tube 41, and the photoelectric converter 43 is arranged on the other side of the transparent tube 41. The light source 42 is used to emit light to illuminate the liquid in the transparent tube 41, and the photoelectric converter 43 is used to receive the light passing through the transparent tube 41 and form a photoelectric signal. This setting combines mixing and colorimetric detection into one, reduces the volume of the water quality analyzer, and can effectively shorten the flow path, reduce the amount of reagents used, and reduce waste liquid discharge. Optionally, the transparent tube 41 is made of quartz material.

[0041] In an optional embodiment, the colorimetric component 40 further includes a heating component (not shown), a first high-pressure valve 44 and a second high-pressure valve 45, wherein the first high-pressure valve 44 is connected to the bottom end of the transparent tube 41 and the second outlet 33, and the second high-pressure valve 45 is connected to the top end of the transparent tube 41, and the heating component is used to heat the liquid in the transparent tube 41. This arrangement integrates the digestion component in the mixing and colorimetric detection, thereby reducing the volume of the water quality analyzer.

[0042] When in use, the mixed liquid is driven into the transparent tube 41 for mixing, the first high-pressure valve 44 and the second high-pressure valve 45 are closed, the mixed liquid in the transparent tube 41 is heated to 120°C-125°C, kept warm for a period of time, and then the transparent tube 41 is cooled to about 40°C, the light source 42 emits light to illuminate the liquid in the transparent tube 41, the photoelectric converter 43 receives the light passing through the transparent tube 41 and forms a photoelectric signal to obtain the absorbance value of the mixed liquid.

[0043] See also Figure 3-4In an optional embodiment, the water quality analyzer includes an upper housing 50, a lower housing 60, a partition 70 and a vertical plate 80. The lower housing 60 is installed at the bottom of the upper housing 50. The lower housing 60 has a lower chamber 61, and the lower chamber 61 is used to place one or more of a reagent tank, a pure water tank, a cleaning liquid tank, and a standard solution tank. The upper housing 50 has an inner cavity 51, and the partition 70 divides the inner cavity 51 into an upper chamber 511 and an intermediate chamber 512. The upper chamber 511 is used to install electrical components. The vertical plate 80 is arranged in the intermediate chamber 512, and one side of the vertical plate 80 is rotatably connected to the upper housing 50. The waterway plate assembly 10, the colorimetric assembly 40, the peristaltic pump 20 and the three-way valve are all installed on the vertical plate 80. In this design, by installing the electrical components in the upper chamber 511, placing one or more of the reagent tank, pure water tank, cleaning liquid tank, and standard solution tank in the lower chamber 61, and arranging the waterway plate assembly 10, the colorimetric assembly 40, the peristaltic pump 20, and the three-way valve in the middle chamber 512, the layout is reasonable to avoid electrical problems. In addition, by arranging the vertical plate 80 in the middle chamber 512, one side of the vertical plate 80 is rotatably connected to the upper housing 50, which facilitates the disassembly and maintenance of the waterway plate assembly 10, the colorimetric assembly 40, the peristaltic pump 20, and the three-way valve.

[0044] See also Figure 1-2 and Figure 5 The second aspect of the present invention provides a method S100 for cleaning a liquid path of a water quality analyzer, wherein the water quality analyzer comprises a waterway plate assembly 10, a peristaltic pump 20, a three-way valve 30 and a colorimetric assembly 40, wherein the waterway plate assembly 10 comprises a waterway plate 11 and a plurality of solenoid valves (not shown) mounted on the waterway plate 11, wherein the waterway plate 11 is provided with a flow channel 111, a water sample interface 112, a reagent interface 113, a cleaning liquid interface 114 and a fluid outlet 115, wherein the solenoid valve is used to control the connection or disconnection between each interface and the flow channel 111; the peristaltic pump 20 is connected to the fluid outlet 115; the three-way valve 30 comprises an inlet 31, a first outlet 32 ​​and a second outlet 33, wherein the inlet 31 is connected to the peristaltic pump 20; the colorimetric assembly 40 is connected to the second outlet 33, and the colorimetric assembly 40 is used for absorbance detection of water samples; the waterway plate assembly 10 is also provided with a waste outlet 116;

[0045] The liquid path cleaning method S100 of the water quality analyzer comprises:

[0046] S10, receiving a cleaning signal;

[0047] S20, closing the second outlet 33 of the three-way valve 30, the peristaltic pump 20 draws cleaning liquid through the cleaning liquid interface 114 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0048] S30, close the first outlet 32 ​​of the three-way valve 30, and the peristaltic pump 20 draws cleaning liquid through the cleaning liquid interface 114 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 reverses, and the waste liquid flows from the colorimetric component 40 to the waterway plate assembly 10 and is discharged from the waste outlet 116.

[0049] After adopting the above-mentioned technical scheme, the waste liquid after cleaning the water circuit plate assembly 10 is discharged from the first outlet 32 ​​of the three-way valve 30, and the waste liquid after cleaning the colorimetric assembly 40 is discharged from the waste outlet 116. In this way, the waste liquid after cleaning the water circuit plate assembly 10 will not pass through the colorimetric assembly 40, and will not cause pollution to the colorimetric assembly 40, thereby improving the accuracy of the detection result.

[0050] In an optional embodiment, the cleaning liquid interface 114 includes a pure water interface 1141 and a cleaning agent interface 1142, and the liquid path cleaning method S100 of the water quality analyzer includes:

[0051] Before testing the content of the test components in the water sample, perform the following liquid path cleaning steps:

[0052] The second outlet 33 of the three-way valve 30 is closed, and the peristaltic pump 20 draws pure water through the pure water interface 1141 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0053] The first outlet 32 ​​of the three-way valve 30 is closed, and the peristaltic pump 20 draws pure water through the pure water interface 1141 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 is reversed, and the waste liquid flows from the colorimetric component 40 to the waterway plate component 10 and is discharged from the waste outlet 116;

[0054] After testing the content of the components in the water sample, perform the following liquid path cleaning steps:

[0055] The second outlet 33 of the three-way valve 30 is closed, and the peristaltic pump 20 draws the cleaning agent through the cleaning agent interface 1142 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0056] The first outlet 32 ​​of the three-way valve 30 is closed, and the peristaltic pump 20 draws cleaning agent through the cleaning agent interface 1142 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 reverses, and the waste liquid flows from the colorimetric component 40 to the waterway plate assembly 10 and is discharged from the waste outlet 116.

[0057] After adopting the above technical solution, by arranging to clean the waterway plate assembly 10 and the colorimetric assembly 40 with purified water before detecting the content of the detected component in the water sample, and cleaning the waterway plate assembly 10 and the colorimetric assembly 40 with a cleaning agent after detecting the content of the detected component in the water sample, not only can the waterway plate assembly 10 and the colorimetric assembly 40 be effectively cleaned, and impurities such as residual reagents and water samples in the liquid path can be avoided, and the accuracy of the data of each test can be improved. In addition, the amount of cleaning agent used can be saved, the cost can be saved, and the discharge of cleaning agent can be reduced, and pollution can be reduced.

[0058] In an optional embodiment, after cleaning with purified water and before pumping in the reagent, the reagent is pumped into the liquid circuit or the water sample is pumped into the liquid circuit to rinse the liquid circuit.

[0059] See also Figure 1-2 and Figure 6 The third aspect of the present invention provides a water quality analysis method T100 for a water quality analyzer, the water quality analyzer comprising a waterway board assembly 10, a peristaltic pump 20 and a colorimetric assembly 40, the waterway board assembly 10 comprising a waterway board 11 and a plurality of solenoid valves (not shown) mounted on the waterway board 11, the waterway board 11 being provided with a flow channel 111, a water sample interface 112, a reagent interface 113 and a fluid outlet 115, the solenoid valve being used to control the connection or disconnection of each interface with the flow channel 111; the peristaltic pump 20 being connected to the fluid outlet 115; the colorimetric assembly 40 being connected to the peristaltic pump 20, the water quality analysis method T100 for the water quality analyzer comprising:

[0060] T10, pumping the reagent to mix with the water sample filled in the flow channel 111 to obtain a mixed solution;

[0061] T20, driving the mixed solution to the colorimetric component 40, performing absorbance detection on the mixed solution in the colorimetric component 40 to obtain an absorbance value;

[0062] T30, analyze the absorbance value to obtain the content value of the detected component in the water sample.

[0063] After adopting the above technical solution, by filling the flow channel 111 with water sample, and then pumping the reagent to mix with the water sample in the flow channel 111, the time for mixing the reagent and the water sample can be effectively shortened, thereby shortening the content detection time of the components to be detected in the water sample, and improving the timeliness of the water quality analyzer analysis. Moreover, in this process, only a certain amount of reagent needs to be pumped in, and there is no excess reagent discharge, which reduces reagent discharge, saves resources, and reduces pollution.

[0064] See also Figure 1-2 and Figure 7 In an optional embodiment, the pumped reagent is mixed with the water sample in the flow channel 111 to obtain a mixed solution, including:

[0065] T11, pump water sample into the colorimetric component 40, and the water sample fills the flow channel 111 and the colorimetric component 40;

[0066] T12, pump the reagent into the flow channel 111 to mix with the water sample to obtain a mixed solution.

[0067] See also Figure 1-2 and Figure 8 In other embodiments, the pumped reagent is mixed with the water sample in the flow channel 111 to obtain a mixed solution, including:

[0068] T11', pump a quantitative water sample into the colorimetric component 40;

[0069] T12', the peristaltic pump 20 reverses to drive the water sample in the colorimetric component 40 to fill the pipe and flow channel 111 between the colorimetric component 40 and the waterway plate 11;

[0070] T13', pump the reagent into the flow channel 111 to mix with the water sample to obtain a mixed solution.

[0071] The pumping of a fixed amount of water sample can be controlled by the rotation speed and time of the peristaltic pump 20 .

[0072] In an optional embodiment, the water channel plate 11 is further provided with an air interface 117. After the pumped reagent is mixed with the water sample in the flow channel, the water quality analysis method of the water quality analyzer further includes:

[0073] Air is blown in from the air interface 117 to drive the mixed liquid into the colorimetric component 40 .

[0074] See also Fig. 9 In an optional embodiment, the waterway plate 11 is further provided with a pure water interface 1141. Before the peristaltic pump 20 is reversed, the water quality analysis method of the water quality analyzer further includes:

[0075] Detect the concentration of the test component in the water sample;

[0076] When the concentration of the detected component is greater than the preset value, a certain amount of purified water is pumped into the colorimetric component to dilute the water sample.

[0077] The purpose of setting this step is that when the concentration of the detected component in the water sample is too high and exceeds the detection threshold, it will cause inaccurate detection data. Diluting the concentration of the detected component in the water sample to a normal value will facilitate detection and improve data accuracy.

[0078] See also Figure 1-2 and Fig. 9In an optional embodiment, the colorimetric component 40 includes a transparent tube 41, a light source 42, a photoelectric converter 43, a heating component (not shown), a first high-pressure valve 44 and a second high-pressure valve 45, the first high-pressure valve 44 is connected to the bottom end of the transparent tube 41 and the peristaltic pump 20, the second high-pressure valve 45 is connected to the top end of the transparent tube 41, the light source 42 is arranged on one side of the transparent tube 41, the photoelectric converter 43 is arranged on the other side of the transparent tube 41, the heating component is used to heat the liquid in the transparent tube 41, the light source 42 is used to emit light to irradiate the liquid in the transparent tube 41, and the photoelectric converter 43 is used to receive the light passing through the transparent tube 41 and form a photoelectric signal;

[0079] The absorbance detection of the mixed solution in the colorimetric component 40 to obtain the absorbance value includes:

[0080] T21, close the first high-pressure valve 44 and the second high-pressure valve 45;

[0081] T22, start the heating component to heat the liquid in the transparent tube 41 to a preset temperature value to digest the water sample;

[0082] T23, after the preset digestion time, cool the liquid to the preset temperature value;

[0083] T24, start the light source 42 and the photoelectric converter 43 to detect the absorbance of the liquid in the transparent tube 41 to obtain the absorbance value.

[0084] In an optional embodiment, starting the heating component to heat the liquid in the transparent tube 41 to a preset temperature value to perform water sample digestion includes:

[0085] The heating component is started to heat the liquid in the transparent tube 41 to 120° C.-125° C. to digest the water sample.

[0086] In an optional embodiment, the water quality analysis method S20 of the water quality analyzer further includes:

[0087] Before and after detecting the content of the detected component in the water sample, the waterway plate assembly 10 and the colorimetric assembly 40 are cleaned.

[0088] In an optional embodiment, the water quality analyzer further includes a three-way valve 30, the three-way valve 30 includes an inlet 31, a first outlet 32 ​​and a second outlet 33, the inlet 31 is connected to the peristaltic pump 20, the second outlet 33 is connected to the colorimetric component 40, and the waterway plate is further provided with a cleaning liquid interface 114 and a waste outlet 116;

[0089] The cleaning of the waterway plate assembly 10 and the colorimetric assembly 40 includes:

[0090] Receive cleaning signal;

[0091] Close the second outlet 33 of the three-way valve 30, and the peristaltic pump 20 extracts cleaning liquid through the cleaning liquid interface 114 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0092] The first outlet 32 ​​of the three-way valve 30 is closed, and the peristaltic pump 20 draws cleaning liquid through the cleaning liquid interface 114 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 reverses, and the waste liquid flows from the colorimetric component 40 to the waterway plate assembly 10 and is discharged from the waste outlet 116.

[0093] After adopting the above-mentioned technical scheme, by setting the waste liquid after cleaning the water circuit plate assembly 10 to be discharged from the first outlet 32 ​​of the three-way valve 30, and the waste liquid after cleaning the colorimetric assembly 40 to be discharged from the waste outlet 116, the waste liquid after cleaning the water circuit plate assembly 10 will not pass through the colorimetric assembly 40 and will not cause pollution to the colorimetric assembly 40, thereby improving the accuracy of the detection result.

[0094] In an optional embodiment, the cleaning liquid interface 114 includes a pure water interface 1141 and a cleaning agent interface 1142. Before detecting the content of the detected component in the water sample, the following cleaning steps are performed:

[0095] The second outlet 33 of the three-way valve 30 is closed, and the peristaltic pump 20 draws pure water through the pure water interface 1141 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0096] The first outlet 32 ​​of the three-way valve 30 is closed, and the peristaltic pump 20 draws pure water through the pure water interface 1141 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 reverses, and the waste liquid flows from the colorimetric component 40 to the waterway plate assembly 10 and is discharged from the waste outlet 116.

[0097] After testing the content of the test components in the water sample, perform the following cleaning steps:

[0098] The second outlet 33 of the three-way valve 30 is closed, and the peristaltic pump 20 draws the cleaning agent through the cleaning agent interface 1142 to clean the waterway plate assembly 10, and the waste liquid after cleaning is discharged from the first outlet 32 ​​of the three-way valve 30;

[0099] The first outlet 32 ​​of the three-way valve 30 is closed, and the peristaltic pump 20 draws cleaning agent through the cleaning agent interface 1142 to clean the colorimetric component 40. After cleaning, the peristaltic pump 20 reverses, and the waste liquid flows from the colorimetric component 40 to the waterway plate assembly 10 and is discharged from the waste outlet 116.

[0100] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for cleaning a liquid path of a water quality analyzer, characterized in that: The water quality analyzer includes a waterway board assembly, a peristaltic pump, a three-way valve and a colorimetric assembly. The waterway board assembly includes a waterway board and a plurality of solenoid valves installed on the waterway board. The waterway board is provided with a flow channel, a water sample interface, a reagent interface, a cleaning liquid interface and a fluid outlet. The solenoid valve is used to control the connection or disconnection of each interface with the flow channel; the peristaltic pump is connected to the fluid outlet; the three-way valve includes an inlet, a first outlet and a second outlet, and the inlet is connected to the peristaltic pump; the colorimetric assembly is connected to the second outlet, and the colorimetric assembly is used for absorbance detection of water samples; the waterway board assembly is also provided with a waste outlet; The waterway plate is provided with a plurality of groups of three-way interfaces, each group of the three-way interfaces includes a common interface, a left interface and a right interface, and the solenoid valve is used to control the left interface or the right interface to be connected with the common interface; a plurality of groups of the three-way interfaces are connected in series by the flow channel, wherein the common interface of the first group is connected with the left interface or the right interface of the second group, and the remaining left interface or the right interface is selectively used as the water sample interface or the cleaning liquid interface or the reagent interface, and the common interface of the last group of the three-way interfaces is connected to the peristaltic pump; the left interface or the right interface of the last group of the three-way interfaces is used as the waste outlet; The liquid path cleaning method of the water quality analyzer comprises: Receive cleaning signal; The second outlet of the three-way valve is closed, and the peristaltic pump draws cleaning liquid through the cleaning liquid interface to clean the waterway plate assembly, and the waste liquid after cleaning is discharged from the first outlet of the three-way valve; The first outlet of the three-way valve is closed, and the peristaltic pump draws cleaning liquid through the cleaning liquid interface to clean the colorimetric component. After cleaning, the peristaltic pump is reversed, and the waste liquid flows from the colorimetric component to the waterway plate component and is discharged from the waste outlet.

2. The method for cleaning the liquid path of a water quality analyzer according to claim 1, characterized in that: The cleaning liquid interface includes a pure water interface and a cleaning agent interface, and the liquid path cleaning method of the water quality analyzer includes: Before testing the content of the test components in the water sample, perform the following liquid path cleaning steps: The second outlet of the three-way valve is closed, and the peristaltic pump draws pure water through the pure water interface to clean the waterway plate assembly, and the waste liquid after cleaning is discharged from the first outlet of the three-way valve; The first outlet of the three-way valve is closed, and the peristaltic pump draws pure water through the pure water interface to clean the colorimetric component. After cleaning, the peristaltic pump is reversed, and the waste liquid flows from the colorimetric component to the waterway plate component and is discharged from the waste outlet; After testing the content of the components in the water sample, perform the following liquid path cleaning steps: The second outlet of the three-way valve is closed, and the peristaltic pump draws cleaning agent through the cleaning agent interface to clean the waterway plate assembly, and the waste liquid after cleaning is discharged from the first outlet of the three-way valve; The first outlet of the three-way valve is closed, and the peristaltic pump draws cleaning agent through the cleaning agent interface to clean the colorimetric component. After cleaning, the peristaltic pump is reversed, and the waste liquid flows from the colorimetric component to the waterway plate component and is discharged from the waste outlet.

3. The method for cleaning the liquid path of a water quality analyzer according to claim 1, characterized in that: The cleaning liquid interface includes a pure water interface and a cleaning agent interface. One of the left interface and the right interface of the first group of three-way interfaces is used as the cleaning agent interface, and one of the left interface and the right interface of the second group of three-way interfaces is used as the pure water interface.

4. The method for cleaning the liquid path of a water quality analyzer according to claim 3, characterized in that: The waterway plate is also provided with an air interface, and the other of the left interface and the right interface of the first group of three-way interfaces is used as the air interface.

5. The method for cleaning the liquid path of a water quality analyzer according to claim 1, characterized in that: The colorimetric component includes a transparent tube, a light source and a photoelectric converter. The transparent tube is connected to the second outlet. The light source is arranged on one side of the transparent tube, and the photoelectric converter is arranged on the other side of the transparent tube. The light source is used to emit light to illuminate the liquid in the transparent tube, and the photoelectric converter is used to receive the light passing through the transparent tube and form a photoelectric signal.

6. The method for cleaning the liquid path of a water quality analyzer according to claim 5, characterized in that: The colorimetric component also includes a heating component, a first high-pressure valve and a second high-pressure valve, the first high-pressure valve is connected to the bottom end of the transparent tube and the second outlet, the second high-pressure valve is connected to the top end of the transparent tube, and the heating component is used to heat the liquid in the transparent tube.

7. The method for cleaning the liquid path of a water quality analyzer according to claim 1, characterized in that: The water quality analyzer includes an upper shell, a lower shell, a partition and a vertical plate. The lower shell is installed at the bottom of the upper shell. The lower shell has a lower chamber. The lower chamber is used to place one or more of a reagent tank, a pure water tank, a cleaning liquid tank, and a standard solution tank. The upper shell has an inner cavity. The partition divides the inner cavity into an upper chamber and an intermediate chamber. The upper chamber is used to install electrical components. The vertical plate is arranged in the intermediate chamber. One side of the vertical plate is rotatably connected to the upper shell. The waterway plate assembly, the colorimetric assembly, the peristaltic pump and the three-way valve are all installed on the vertical plate.

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