A photometric element detection device

Abstract

The present invention discloses a photometric element detection device, which includes a tube body with end cap I and end cap II respectively provided at both ends. An electric heating wire is wound around the tube body. A slidable piston is provided in the tube body. The piston divides the internal space of the tube body into a sealed area A close to end cap I and an area B close to end cap II. Both end cap I and end cap II are provided with a plurality of interfaces, and the interfaces can be connected to a water sample pipeline, a digestion solution pipeline, a color reagent pipeline, and a waste liquid pipeline. The above-mentioned photometric element detection device can form different detection schemes according to different interface setting methods, and can achieve different effects. During detection, the piston in the tube body reciprocates to realize the reuse of the reaction kettle. When the piston moves, it can also clean the tube wall, realizing the repeated use of the reaction environment and continuous detection. At the same time, the detection device can be miniaturized and lightened according to actual needs, and is suitable for various scenarios such as desktop, portable, and submersible vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of element detection, and particularly to a photometric element detection device. Background Art

[0002] The applicable scenarios and objects of photometric element detection are diverse. For example, the analysis and detection of total phosphorus and total nitrogen dissolved in water are two common photometric element detections.

[0003] Taking the detection of total phosphorus dissolved in water as an example, the existing detection method is as follows: taking a water sample; after sampling, digesting the water sample. During the digestion process, heating and injecting a digestion solution are required to digest various forms of phosphates in the water sample into orthophosphates for determination; after digestion, cooling the water sample, injecting a color developing solution (such as ascorbic acid solution and molybdate solution) into the cooled water sample, standing for a period of time, irradiating with a light source and measuring the absorbance, and further calculating to obtain the total phosphorus content measurement result. The existing detection devices are usually manually operated, taking a single sample in a test tube for a single detection. After completing a single detection, the test tube needs to be cleaned, and then the steps of manual repeated single sampling and detection are carried out. It takes a long time to obtain data, the experimental efficiency is low, and the reaction environment cannot be reused.

[0004] Therefore, how to provide a photometric element detection device that can solve the above problems is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The purpose of the present invention is to provide a photometric element detection device, which can form different detection schemes according to different interface setting methods, and can achieve different effects. During detection, the piston in the tube body reciprocates, which can not only brush the pipeline through the piston, but also divide the pipeline into two reaction vessels to realize the reuse of the reaction environment and continuous detection; at the same time, the detection device can be miniaturized and light-weighted according to actual needs, and all detection processes are in a closed environment, and changes in the external environment will not affect the reaction and detection processes in the pipeline. It is applicable to various detection scenarios such as underwater submersibles, surface monitoring ships, and bench-top and portable ones.

[0006] To achieve the above object, the present invention provides a photometric element detection device, including a tube body with end caps I and II respectively provided at both ends. An electric heating wire is wound around the tube body. A slidable piston is provided in the tube body. The piston divides the internal space of the tube body into a sealed area A close to end cap I and an area B close to end cap II. Both end cap I and end cap II are provided with a plurality of interfaces, and the interfaces can be connected to a water sample pipeline, a digestion solution pipeline, a color developing agent pipeline, and a waste liquid pipeline.

[0007] Preferably, the multiple interfaces of the end cap I are connected to the water sample pipeline I, the digestion solution pipeline I, the color reagent pipeline I, the cleaning solution pipeline I, and the waste liquid pipeline I. The multiple interfaces of the end cap II are connected to the water sample pipeline II, the digestion solution pipeline II, the color reagent pipeline II, the cleaning solution pipeline II, and the waste liquid pipeline II. On both sides outside the pipeline body, there are respectively a light source emission group and a light source reception group;

[0008] The water sample pipeline I and the water sample pipeline II are respectively communicated with the water sample unit. The digestion solution pipeline I and the digestion solution pipeline II are respectively communicated with the digestion solution unit. The color reagent pipeline I and the color reagent pipeline II are respectively communicated with the color reagent unit. The cleaning solution pipeline I and the cleaning solution pipeline II are respectively communicated with the cleaning solution unit. The waste liquid pipeline I and the waste liquid pipeline II are respectively communicated with the waste liquid unit.

[0009] Preferably, the water sample pipeline I and the water sample pipeline II are respectively provided with a peristaltic pump I and a peristaltic pump II. The digestion solution pipeline I and the digestion solution pipeline II are respectively provided with a pinch valve II-I and a pinch valve II-II. The digestion solution unit is provided with a metering peristaltic pump I. The color reagent pipeline I and the color reagent pipeline II are respectively provided with a pinch valve III-I and a pinch valve III-II. The color reagent unit is provided with a metering peristaltic pump II. The cleaning solution pipeline I and the cleaning solution pipeline II are respectively provided with a pinch valve IV-I and a pinch valve IV-II. The cleaning solution unit is provided with a metering peristaltic pump III. The waste liquid pipeline I and the waste liquid pipeline II are respectively provided with a pinch valve V-I and a pinch valve V-II.

[0010] Preferably, the multiple interfaces of the end cap I are connected to the color reagent pipeline I, the waste liquid pipeline I, and the mixed liquid pipeline I. The multiple interfaces of the end cap II are connected to the water sample pipeline II, the digestion solution pipeline II, the cleaning solution pipeline I, and the mixed liquid pipeline II. A cooler is provided on the pipeline where the mixed liquid pipeline II is communicated with the mixed liquid pipeline I. On both sides outside the pipeline body, there are respectively a light source emission group and a light source reception group;

[0011] The mixed liquid pipeline II is communicated with the mixed liquid pipeline I. The color reagent pipeline I is communicated with the color reagent unit. The waste liquid pipeline I and the mixed liquid pipeline I are communicated with the waste liquid unit. The water sample pipeline II is communicated with the water sample unit. The digestion solution pipeline II is communicated with the digestion solution unit. The cleaning solution pipeline I is communicated with the cleaning solution unit.

[0012] Preferably, a metering peristaltic pump IV is provided between the mixed liquid pipeline II and the mixed liquid pipeline I, a metering peristaltic pump II is provided between the color reagent unit and the color reagent pipeline I, pinch valves V-III and V-IV are respectively provided on the waste liquid pipeline I and the mixed liquid pipeline I, a pinch valve VI-I is provided between the mixed liquid pipeline I and the pinch valve V-IV, a peristaltic pump II is provided on the water sample pipeline II, a metering peristaltic pump I is provided on the digestion solution unit, and a metering peristaltic pump III is provided on the cleaning solution unit.

[0013] Preferably, a plurality of the interfaces of the end cap I are connected to the water sample pipeline I, the digestion solution pipeline I, the cleaning solution pipeline I and the waste liquid pipeline I, a plurality of the interfaces of the end cap II are connected to the water sample pipeline II, the digestion solution pipeline II, the cleaning solution pipeline II and the waste liquid pipeline II, and a light source emission group and a light source receiving group are respectively provided on both sides outside the flow-through unit;

[0014] The water sample pipeline I and the water sample pipeline II are respectively communicated with the water sample unit, the digestion solution pipeline I and the digestion solution pipeline II are respectively communicated with the digestion solution unit, the cleaning solution pipeline I and the cleaning solution pipeline II are respectively communicated with the cleaning solution unit, the waste liquid pipeline I and the waste liquid pipeline II are respectively communicated with the flow-through unit, and the flow-through unit is respectively communicated with the color reagent unit and the waste liquid unit.

[0015] Preferably, a peristaltic pump I and a peristaltic pump II are respectively provided on the water sample pipeline I and the water sample pipeline II, pinch valves II-I and II-II are respectively provided on the digestion solution pipeline I and the digestion solution pipeline II, a metering peristaltic pump I is provided on the digestion solution unit, pinch valves IV-I and IV-II are respectively provided on the cleaning solution pipeline I and the cleaning solution pipeline II, a metering peristaltic pump III is provided on the cleaning solution unit, pinch valves V-I and V-II are respectively provided on the waste liquid pipeline I and the waste liquid pipeline II, a metering peristaltic pump II is provided on the color reagent unit, and a pinch valve V-V is provided between the flow-through unit and the waste liquid unit.

[0016] Preferably, the number of the pipe body, the end cap I, the end cap II and the piston is two groups. A plurality of the interfaces of the first group of the end cap I are connected to the water sample pipeline I, the digestion solution pipeline I and the digestion mixed liquid pipeline I, a plurality of the interfaces of the second group of the end cap I are connected to the digestion mixed liquid pipeline III, the color reagent pipeline I and the waste liquid pipeline I, a plurality of the interfaces of the first group of the end cap II are connected to the water sample pipeline II, the digestion solution pipeline II and the digestion mixed liquid pipeline II, and a plurality of the interfaces of the second group of the end cap II are connected to the digestion mixed liquid pipeline IV, the color reagent pipeline II and the waste liquid pipeline II;

[0017] The water sample pipeline I and the water sample pipeline II are respectively connected to the water sample unit, the digestion solution pipeline I and the digestion solution pipeline II are respectively connected to the digestion solution unit, the color reagent pipeline I and the color reagent pipeline II are respectively connected to the color reagent unit, the waste liquid pipeline I and the waste liquid pipeline II are respectively connected to the waste liquid unit, the digestion mixture pipeline I is connected to the digestion mixture pipeline III and is connected to the waste liquid unit, and the digestion mixture pipeline II is connected to the digestion mixture pipeline IV and is connected to the waste liquid unit.

[0018] Preferably, the water sample pipeline I and the water sample pipeline II are respectively provided with a peristaltic pump I and a peristaltic pump II, the digestion solution unit is provided with a metering peristaltic pump I, the color reagent unit is provided with a metering peristaltic pump II, the waste liquid pipeline I and the waste liquid pipeline II are respectively provided with a pinch valve V-I and a pinch valve V-II, the digestion mixture pipeline I and the digestion mixture pipeline II are both provided with a peristaltic pump III, the digestion mixture pipeline III and the digestion mixture pipeline IV are both provided with a pinch valve VII-IV, and a pinch valve V-III is provided between the pinch valve VII-IV and the waste liquid unit.

[0019] Preferably, coolers are provided on the pipelines where the digestion mixture pipeline I is connected to the digestion mixture pipeline III and the digestion mixture pipeline II is connected to the digestion mixture pipeline IV, and a light source emission group and a light source reception group are respectively provided on both sides outside the second group of pipe bodies.

[0020] Compared with the above background technology, the photometric element detection device provided by the present invention includes a pipe body and end caps I and II provided at both ends of the pipe body. An electric heating wire is wound around the pipe body. A piston is provided in the pipe body. The piston can slide in the pipe body and divides the inner space of the pipe body into a sealed area A and an area B, and the pipe wall is washed by the movement of the piston. Both end caps I and II are provided with a plurality of interfaces, and the interfaces can be connected to the water sample pipeline, the digestion solution pipeline, the color reagent pipeline and the waste liquid pipeline; in the selection of the detection scheme of the photometric element detection device, different interface setting methods can achieve different effects; for example, both end caps at both ends are connected to the water sample pipeline, the digestion solution pipeline, the color reagent pipeline and the waste liquid pipeline through the interfaces. At this time, the functions of area A and area B are the same. The steps of entering the water sample, digesting the water sample and coloring the water sample can be performed in area A. After the above steps are completed in area A, the piston moves from area B to area A to discharge the waste liquid, so as to realize the reciprocating movement of the piston in the pipe body during detection, so that the reaction environment can be reused. The detection device can be miniaturized and lightened according to actual needs, and is not only suitable for laboratory situations, but can also be continuously detected in a submersible vehicle. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0022] Figure 1 Schematic diagram of the first part of the photometric element detection device provided by the first embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the second part of the photometric element detection device provided by the first embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the photometric element detection device provided by the second embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the first part of the photometric element detection device provided by the third embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the second part of the photometric element detection device provided by the third embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the photometric element detection device provided by the fourth embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the combination of the cleaning liquid unit and the waste liquid unit provided by an embodiment of the present invention.

[0029] Wherein:

[0030] 10 - Body, 21 - End Cap I, 22 - End Cap II, 30 - Piston, 41 - Temperature Sensor I, 42 - Temperature Sensor II, 50 - Heating Wire, 61 - Light Source Emission Group, 62 - Light Source Reception Group, 70 - Cooler, 200 - Digestion Solution Unit, 300 - Color Reagent Unit, 400 - Cleaning Solution Unit, 500 - Waste Liquid Unit, 101 - Water Sample Pipeline I, 102 - Water Sample Pipeline II, 201 - Digestion Solution Pipeline I, 202 - Digestion Solution Pipeline II, 301 - Color Reagent Pipeline I, 302 - Color Reagent Pipeline II, 401 - Cleaning Solution Pipeline I, 402 - Cleaning Solution Pipeline II, 501 - Waste Liquid Pipeline I, 502 - Waste Liquid Pipeline II, 601 - Mixed Liquid Pipeline I, 602 - Mixed Liquid Pipeline II, 701 - Digested Mixed Liquid Pipeline I, 702 - Digested Mixed Liquid Pipeline II, 703 - Digested Mixed Liquid Pipeline III, 704 - Digested Mixed Liquid Pipeline IV, 110 - Peristaltic Pump I, 120 - Peristaltic Pump II, 210 - Metering Peristaltic Pump I, 310 - Metering Peristaltic Pump II, 410 - Metering Peristaltic Pump III, 610 - Metering Peristaltic Pump IV, 720 - Peristaltic Pump III, 2010 - Pinch Valve II - I, 2020 - Pinch Valve II - II, 3010 - Pinch Valve III - I, 3020 - Pinch Valve III - II, 4010 - Pinch Valve IV - I, 4020 - Pinch Valve IV - II, 5010 - Pinch Valve V - I, 5020 - Pinch Valve V - II, 5030 - Pinch Valve V - III, 5040 - Pinch Valve V - IV, 5050 - Pinch Valve V - V, 6010 - Pinch Valve VI - I, 7040 - Pinch Valve VII - IV. Detailed Embodiment

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Please refer to Figures 1 to 7 , in which, Figure 1 is the first - part schematic diagram of the photometric element detection device provided by the first embodiment of the present invention, Figure 2 is the second - part schematic diagram of the photometric element detection device provided by the first embodiment of the present invention, Figure 3 is the schematic diagram of the photometric element detection device provided by the second embodiment of the present invention, Figure 4A schematic diagram of the first part of a photometric element detection device provided in a third embodiment of the present invention, Figure 5 The second part of the schematic diagram of the photometric element detection device provided by the third embodiment of the present invention is as follows: Figure 6 A schematic diagram of a photometric element detection device provided in a fourth embodiment of the present invention, Figure 7 A schematic diagram of the combination of a cleaning liquid unit and a waste liquid unit provided in one embodiment of the present invention.

[0034] The present invention provides a photometric element detection device, comprising a tube body 10 and an end cap I21 and an end cap II22 arranged at both ends of the tube body 10. A heating wire 50 is wound around the outside of the tube body 10, and a piston 30 is arranged in the tube body 10. The piston 30 can slide and divide the internal space of the tube body 10 into a sealed area A and area B. The area A is close to the end cap I21, and the area B is close to the end cap II22. A plurality of interfaces are arranged on the end cap I21 and the end cap II22. Different detection schemes are formed according to different numbers and methods of setting different interfaces, and different effects can be achieved, such as Figures 1 to 6 At least four specific photometric element detection arrangements are shown.

[0035] Among them, when multiple detection liquids need to be injected, the number of end cap pipelines can be adjusted according to the detection needs or branches can be directly connected to the corresponding pipelines to increase the number of required detection contents. The interface can be connected to multiple pipelines as needed, such as water sample pipeline, digestion liquid A, B, C pipeline, color developer pipeline and waste liquid pipeline. The water sample pipeline is used for water sample entry, the digestion liquid pipeline is used for digestion liquid entry, the color developer pipeline is used for color developer entry, and the waste liquid pipeline is used for waste liquid discharge.

[0036] For example, the end caps at both ends are connected to the water sample pipeline, the digestion liquid pipeline, the color developer pipeline and the waste liquid pipeline. At this time, the functions of area A and area B are the same, and the steps of entering the water sample, digesting the water sample and developing the water sample can be performed in area A. After the above steps are completed in area A, the piston 30 moves from area B to area A to discharge the waste liquid, thereby realizing the reciprocating motion of the piston 30 in the tube body 10 during detection, realizing the reuse and continuous detection of the reaction environment. The detection device can be miniaturized and lightweight according to actual needs, and its heat dissipation is completed in the tube body; it is suitable for various scenarios such as submersibles. In addition, according to different applicable scenarios, it can be specifically set as an underwater, outdoor and desktop detection device; according to different detection elements, it can be specifically set as a detection device for elements such as phosphorus and nitrogen; illustratively, the photometric element detection device is a fully automatic total phosphorus detection device, which realizes automatic detection of parameters such as total phosphorus and total nitrogen; it is miniaturized and lightweight to achieve installation on a submersible; it can be equipped with multiple test tubes including the above-mentioned tube body 10, end cover I21, end cover II22 and piston 30, so as to form a cyclic rapid test.

[0037] In this embodiment, the material of the tube body 10 is ultra-white glass without an absorption peak at a wavelength of 700 nm, with a thickness of not less than 1.5 mm and good uniformity, and it is required for colorimetry; the end of the tube body 10 is a threaded port or a bayonet, and the tube body 10 is threadedly or bayonet-sealedly connected to the end cap I 21 and the end cap II 22. The tensile strength of the thread needs to meet the detection pressure requirements. In this embodiment, an interface with a pressure resistance of 8 kg is used; the inner circumference of the tube body 10 is uniform and flat to ensure the free movement of the piston 30; the material used for the piston 30 is the same as that of the tube body 10, and it is made of a hollow material, sealed on both sides, with the cylinder body being frosted and the edges being chamfered. A sealing ring can be sleeved on the outer circumference of the piston 30 to ensure the seal between the piston 30 and the tube body 10; a buffer part is arranged on one side of the piston 30, which can be an air cushion or a rubber pad, serving as a buffer space when the digestion cannot relieve pressure; by using the fact that the tube body 10 is light-transmitting and the piston 30 is light-impermeable, the position of the piston 30 can be optionally identified using optoelectronic technology. A cursor reference point is set on the tube body 10 as a protection point, and a pair of laser is used to control the stroke of the piston 30.

[0038] In this embodiment, the end cap I 21 and the end cap II 22 are made of metal materials permitted by environmental protection, which can be stainless steel; in terms of their processing convenience, water inlet and outlet holes are processed on the end cap I 21 and the end cap II 22, and screw-in type interfaces are set according to the aperture of the environmental protection hose to achieve connection with the pipeline; among them, the cleaning liquid pipeline is an optional item. The cleaning liquid pipeline is used for the entry of the cleaning liquid. A small amount of cleaning liquid is required to clean the tube body 10 during long-term use, and the piston 30 has a self-cleaning function during short-term use.

[0039] Furthermore, temperature sensors are provided on both the end cap I 21 and the end cap II 22. The temperature sensor on the end cap I 21 is the temperature sensor I 41, and the temperature sensor on the end cap II 22 is the temperature sensor II 42; the end cap I 21 and the end cap II 22 have heat conduction capabilities, and the temperature sensors installed on the end cap I 21 and the end cap II 22 can more accurately detect the temperature of the liquid in the tube body 10; high-precision sensors are required for the temperature sensors, and embedded sensor positions are reserved and tightened on the end cap I 21 and the end cap II 22, such as bolt-type temperature sensors; there are pipelines and circuits on the end cap I 21 and the end cap II 22. The circuit part uses a special cylindrical sealed box for independent waterproofing, and a disposable isolation gasket is set on it, such as using a stainless steel sheet plus a rubber sealing ring; the end cap I 21 and the end cap II 22 are universal. To prevent incomplete rotation, graduation lines should be set.

[0040] In the first specific implementation manner, please refer to Figure 1 and Figure 2, multiple interfaces of the end cap I21 are connected to the water sample pipeline I101, the digestion solution pipeline I201, the color reagent pipeline I301, the cleaning solution pipeline I401 and the waste liquid pipeline I501, and multiple interfaces of the end cap II22 are connected to the water sample pipeline II102, the digestion solution pipeline II202, the color reagent pipeline II302, the cleaning solution pipeline II402 and the waste liquid pipeline II502; the water sample pipeline I101 and the water sample pipeline II102 are respectively connected to the water sample unit, the digestion solution pipeline I201 and the digestion solution pipeline II202 are respectively connected to the digestion solution unit 200, the color reagent pipeline I301 and the color reagent pipeline II302 are respectively connected to the color reagent unit 300, the cleaning solution pipeline I401 and the cleaning solution pipeline II402 are respectively connected to the cleaning solution unit 400, and the waste liquid pipeline I501 and the waste liquid pipeline II502 are respectively connected to the waste liquid unit 500.

[0041] In addition, a light source emission group 61 and a light source reception group 62 are respectively arranged on both sides outside the pipe body 10, and an optoelectronic detection strip for detecting the position of the detection piston 30 can also be additionally arranged. Among them, the water sample pipeline I101 and the water sample pipeline II102 are respectively provided with a peristaltic pump I110 and a peristaltic pump II120, the digestion solution pipeline I201 and the digestion solution pipeline II202 are respectively provided with a pinch valve II-I2010 and a pinch valve II-II2020, the digestion solution unit 200 is provided with a metering peristaltic pump I210, the color reagent pipeline I301 and the color reagent pipeline II302 are respectively provided with a pinch valve III-I3010 and a pinch valve III-II3020, the color reagent unit 300 is provided with a metering peristaltic pump II310, the cleaning solution pipeline I401 and the cleaning solution pipeline II402 are respectively provided with a pinch valve IV-I4010 and a pinch valve IV-II4020, the cleaning solution unit 400 is provided with a metering peristaltic pump III410, and the waste liquid pipeline I501 and the waste liquid pipeline II502 are respectively provided with a pinch valve V-I5010 and a pinch valve V-II5020. When more varieties of detection liquids need to be injected, a metering pump is used to reserve the pipe content volume to reserve space in the pipe for injecting more detection liquids.

[0042] It should be noted that if there are multiple varieties of detection liquids (such as digestion solutions), such as digestion solutions A, B, and C that need to be injected at different times, corresponding storage tanks, injection pipelines, peristaltic pumps, and pinch valves are configured for the added detection liquids, and they are injected into the pipelines as needed based on time sequence or temperature according to the detection requirements of the object to be detected. In this configuration, the detection device can detect different parameters by configuring different detection liquids, detection time sequences, and detection temperatures, such as total phosphorus, total nitrogen, etc.

[0043] In the specific working process:

[0044] 1. Reset: Turn on the peristaltic pump I110 to inject the water sample until the piston 30 reaches the top of area B. At this time, there may be air in area A. Turn off the peristaltic pump I110, open the pinch valve V-I5010 of the waste liquid pipeline I501, turn on the peristaltic pump II120, fill the water sample, and control the peristaltic pump II120 according to the measurement or time until the water is full. This measurement value can simulate the actual water level on the interface. At this time, both the air and water in area A are discharged into the waste liquid unit 500, and the reset is completed.

[0045] 2. Water injection: Turn on the peristaltic pump I110 and the pinch valve V-II5020 of the waste liquid pipeline II502 to inject water into area A. The water in area B is discharged into the waste liquid unit 500 through the pinch valve V-II5020. After the process is completed, close the pinch valve V-II5020 and the peristaltic pump I110.

[0046] 3. Digestion: Turn on the metering peristaltic pump I210 of the digestion solution unit 200, open the pinch valve II-I2010 of the digestion solution pipeline I201 and the pinch valve V-II5020 of the waste liquid pipeline II502. The water in area B is discharged into the waste liquid unit 500 through the pinch valve V-II5020, inject the digestion solution into area A, heat area A and maintain the temperature for 30 minutes; after digestion is completed, turn off the heating and enter the heat dissipation stage, using circulating air cooling, and the heat dissipation medium is the outer wall of the submersible.

[0047] 4. Color development: When the temperature reaches 40 °C, turn on the metering peristaltic pump II310 of the color developer unit 300, open the pinch valve III-I3010 of the color developer pipeline I301, inject the color developer into area A, and the buffer part on one side of the piston 30 provides a buffer space for the injection of the color developer. After standing for about 1 minute, start colorimetric analysis and output data.

[0048] It should be noted that this implementation mode is a single-tube multiplexing mode, and the pinch valves and peristaltic pumps are combined in a component manner, and the maintenance design is carried out according to the component replacement method; when applied to a submersible or a portable device, the containers of the cleaning solution unit 400 and the waste liquid unit 500 can be shared. Please refer to Figure 7 , and there is a plug body similar to the piston 30 between them; for balance, the waste liquid unit 500 needs to be filled with a liquid first. Fill the waste liquid unit 500 with a cleaning solution such as distilled water first. Each time waste liquid is discharged, an equal amount of the pre-stored cleaning solution will be discharged, and the discharged cleaning solution is used to clean the pipeline; since the amount of water required for the cleaning process is 50% of the working process, both the waste liquid and the polluted liquid after cleaning need to be discharged into the waste liquid unit 500, so the extra 50% of the cleaning solution (distilled water) will be discharged into the environmental water.

[0049] Exemplarily, in the cleaning process of this shared structure:

[0050] 1. After the digestion and colorimetric determination in Area A are completed, the mixed solution in Area A is drained into the waste liquid unit 500. At this time, the waste liquid unit 500 discharges an equal amount of cleaning liquid into Area B. At this time, Area B is cleaned and Area A is empty.

[0051] 2. Area A starts to suck in the cleaning liquid for cleaning. At this time, the contaminated liquid in Area B enters the waste liquid unit 500. When Area B discharges the contaminated liquid to the waste liquid unit 500, the cleaning liquid enters Area A. At this time, Area B has been cleaned and is empty.

[0052] 3. Area B extracts the water sample, and the contaminated liquid in Area A is drained into the waste liquid unit 500. At this time, the cleaning liquid discharged by the waste liquid unit 500 is discarded; in summary, the waste liquid unit 500 absorbs the mixed solution after digestion and the contaminated liquid after cleaning, and the usage amount of the cleaning liquid is 1 / 2. The other 50% of the cleaning liquid will be discarded; through logical combination, the cleaning liquid unit 400 and the waste liquid unit 500 can share a container.

[0053] In the second specific embodiment, please refer to Figure 3 , multiple interfaces of the end cap I21 are connected to the developer pipeline I301, the waste liquid pipeline I501 and the mixed solution pipeline I601. The mixed solution pipeline I601 is the inlet. Multiple interfaces of the end cap II22 are connected to the water sample pipeline II102, the digestion solution pipeline II202, the cleaning liquid pipeline I401 and the mixed solution pipeline II602. The mixed solution pipeline II602 is the outlet; the mixed solution pipeline II602 is communicated with the mixed solution pipeline I601. The developer pipeline I301 is communicated with the developer unit 300. The waste liquid pipeline I501 and the mixed solution pipeline I601 are communicated with the waste liquid unit 500. The water sample pipeline II102 is communicated with the water sample unit. The digestion solution pipeline II202 is communicated with the digestion solution unit 200. The cleaning liquid pipeline I401 is communicated with the cleaning liquid unit 400.

[0054] In addition, a cooler 70 is provided on the pipeline where the mixed solution pipeline II602 is communicated with the mixed solution pipeline I601, and a light source emission group 61 and a light source reception group 62 are respectively provided on both sides outside the pipe body 10.

[0055] The outer circumference of the tube body 10 is wound with an electric heating wire 50, and a detection light source is provided on the tube body 10. In order to ensure the normal use of this detection device underwater, a sealing shell needs to be added to the tube body 10. The main function of the sealing shell is that when the detection device is used underwater, the electric heating wire 50 will not affect the heating effect due to external factors when heating the tube body 10. For example, according to the detection requirements of total phosphorus by the national standard method and photometric method, when detecting the digested water sample, there is a temperature requirement for the water sample. Natural cooling will take a long time. This device uses an external cooler 70 to cool the digested water sample through heat exchange. A temperature sensor can be set on the cooler 70 (or the temperature sensor on the end cover can also be reused). When the water sample passing through the cooler 70 meets the requirements, it is pumped back into the tube body 10 by a peristaltic pump for detection. By controlling the flow rate of the peristaltic pump, the final temperature of the water sample can be controlled in different application environments. For example, when the cooling rate of the cooler 70 is too fast, the final temperature of the water sample can be maintained by increasing the loop flow rate. Conversely, the flow rate is reduced to make the water sample temperature reach the standard.

[0056] Among them, a metering peristaltic pump IV610 is provided between the mixed liquid pipeline II602 and the mixed liquid pipeline I601, a metering peristaltic pump II310 is provided between the color reagent unit 300 and the color reagent pipeline I301, pinch valves V-III5030 and V-IV5040 are respectively provided on the waste liquid pipeline I501 and the mixed liquid pipeline I601, and a pinch valve VI-I6010 is provided between the mixed liquid pipeline I601 and the pinch valve V-IV5040. A peristaltic pump II120 is provided on the water sample pipeline II102, a metering peristaltic pump I210 is provided on the digestion solution unit 200, and a metering peristaltic pump III410 is provided on the cleaning solution unit 400.

[0057] It should be noted that this implementation mode is a single-tube dedicated mode, which is divided into a digestion area and a colorimetric area. The main purpose of the partition use is to have the cooling function for the digested solution, which can shorten the time to obtain the result; at the same time, since it is necessary to first drain the residual liquid in the pipeline between the mixed liquid pipeline II602 and the mixed liquid pipeline I601, the liquid in the tube needs to be drained first. This drained liquid will affect the total amount of the mixed liquid. Therefore, a color reagent is used for compensation, and it is required that the residual amount of the liquid in the tube is equal to the amount of the color reagent, so that the operation effect will not be affected.

[0058] In the specific working process:

[0059] 1. Perform homing: Move the piston 30 to the vertex of area B, which can be done manually or by using an automatic pump suction method; then turn on the metering peristaltic pump III410 to fill area B with cleaning liquid until the piston 30 moves to the vertex of area A. The cleaning liquid can be distilled water; turn on the metering peristaltic pump IV610 and the pinch valve VI-I6010 to inject all the cleaning liquid in area B into area A. At this time, the piston 30 will move to the vertex of area B, completing the homing operation.

[0060] 2. Start the first step: Open the pinch valves V-IV5040 and VI-I6010; Start the metering peristaltic pump I210, and meteringly inject the digestion solution into area B. After the injection is completed, turn off the metering peristaltic pump I210, and start the peristaltic pump II120 to pump the water sample into area B. When injecting into area B, it will push the piston 30 to move towards area A. The water in area A is discharged into the waste liquid unit 500 through the pinch valves V-IV5040 and VI-I6010. When the water sample is injected into area B, the digestion solution and the water sample will be fully mixed until full, and then turn off the peristaltic pump II120.

[0061] 3. Start the second step: Start the heating wire 50 to heat area B, and control the heating temperature to 100 degrees Celsius and keep it warm for 30 minutes through the temperature sensor on the end cover; After the insulation time is completed, open the pinch valves V-IV5040 and the metering peristaltic pump IV610 to meteringly discharge the residual water in the pipe, and calculate the discharged water volume in advance according to the water stored in the pipe; At the same time, inject a quantitative color reagent. The discharged water in the pipe is equal to the injected color reagent. Therefore, when discharging the residual water in the pipe, the piston 30 just moves within the interval to inject the color reagent; After discharging the residual water in the pipe, close the pinch valve V-IV5040, open the pinch valve VI-I6010, and the mixed solution starts to be injected into area A. During the injection process, first cool the mixed solution through the cooler 70. The cooled mixed solution will be fully mixed with the color reagent when injected into area A. After standing for 1 minute, start colorimetric analysis; The light source emission group 61 and the light source receiving group 62 are multiple groups. According to the multi-task grouping setting, including the detection tasks of elements such as total phosphorus and total nitrogen, after obtaining the data, the total phosphorus detection is completed.

[0062] 4. Conduct cleaning: Open the pinch valve V-III5030 and the metering peristaltic pump III410, and inject distilled water into area B; The waste liquid in area A enters the waste liquid unit 500, and at the same time area B is gradually filled with distilled water; Close the pinch valve V-III5030 and the metering peristaltic pump III410, open the metering peristaltic pump IV610 and the pinch valve VI-I6010, and discharge the distilled water into area A to complete the cleaning of area B, the heat dissipation pipeline and area A, and wait for the next round of detection.

[0063] 5. Conduct the next round of detection: Open the pinch valve V-III5030 and the metering peristaltic pump I210, and the digestion solution enters area B. Then turn off the metering peristaltic pump I210, open the peristaltic pump II120. While the water sample is injected into area B, the waste liquid enters the waste liquid unit 500 through the pinch valve V-III5030; Area B is gradually filled with the water sample and the digestion solution, and the next cycle starts.

[0064] In the third specific implementation manner, please refer to Figure 4 and Figure 5, multiple interfaces of the end cap I21 are connected to the water sample pipeline I101, the digestion solution pipeline I201, the cleaning solution pipeline I401 and the waste liquid pipeline I501, and multiple interfaces of the end cap II22 are connected to the water sample pipeline II102, the digestion solution pipeline II202, the cleaning solution pipeline II402 and the waste liquid pipeline II502; the water sample pipeline I101 and the water sample pipeline II102 are respectively communicated to the water sample unit, the digestion solution pipeline I201 and the digestion solution pipeline II202 are respectively communicated to the digestion solution unit 200, the cleaning solution pipeline I401 and the cleaning solution pipeline II402 are respectively communicated to the cleaning solution unit 400, and the waste liquid pipeline I501 and the waste liquid pipeline II502 are respectively communicated to the circulation unit, and the circulation unit is respectively communicated with the color reagent unit 300 and the waste liquid unit 500.

[0065] In addition, a light source emission group 61 and a light source reception group 62 are respectively arranged on both sides outside the circulation unit. The end cap is the pipeline input end. When detecting different objects to be detected, the end cap with the corresponding number of input ends can be replaced according to needs.

[0066] Among them, a peristaltic pump I110 and a peristaltic pump II120 are respectively arranged on the water sample pipeline I101 and the water sample pipeline II102, a pinch valve II-I2010 and a pinch valve II-II2020 are respectively arranged on the digestion solution pipeline I201 and the digestion solution pipeline II202, a metering peristaltic pump I210 is arranged in the digestion solution unit 200, a pinch valve IV-I4010 and a pinch valve IV-II4020 are respectively arranged on the cleaning solution pipeline I401 and the cleaning solution pipeline II402, a metering peristaltic pump III410 is arranged in the cleaning solution unit 400, a pinch valve V-I5010 and a pinch valve V-II5020 are respectively arranged on the waste liquid pipeline I501 and the waste liquid pipeline II502, a metering peristaltic pump II310 is arranged in the color reagent unit 300, and a pinch valve V-V5050 is arranged between the circulation unit and the waste liquid unit 500.

[0067] It should be noted that this implementation mode is a single-tube single-display mode. In the specific working process:

[0068] 1. Turn on the peristaltic pump II120, the pinch valve V-I5010 and the pinch valve V-V5050 to inject water into area A and start the digestion and cooling process;

[0069] 2. When it cools down to 40 °C, turn on the peristaltic pump I110, the pinch valve V-I5010 and the pinch valve V-V5050 to inject water into area B. The mixed liquid after digestion in area B enters the waste liquid unit 500 through the circulation unit; after the drainage in area B is completed, close the pinch valve V-V5050 and the peristaltic pump I110, and do not close the pinch valve V-II5020 to reserve space for the color reagent. At this time, turn on the metering peristaltic pump II310 to quantitatively inject the color reagent into the circulation unit, and start colorimetric analysis after standing for 1 minute.

[0070] It should be noted that:

[0071] 1. The pinch valve V-V5050 can be removed, but it is necessary to ensure that there is no air in the waste liquid unit 500 or the pipeline entering the waste liquid unit 500 is below the water level line, so that the waste liquid unit 500 will not operate without pressure. At this time, the pinch valve V-II5020 in area B of the process can be closed, and the plug body of the waste liquid unit 500 will be pushed when the color reagent is injected.

[0072] 2. The capacity of the flow-through unit is about 30% - 20% of that of the digestion area. The reason why the volume of the mixed liquid is larger than that of the flow-through unit is that the diameter of the pipeline entering the flow-through unit is smaller than that of the flow-through unit, and residual liquid may remain in the flow-through unit during the process. The flow-through unit is flushed with a larger flow of mixed liquid.

[0073] 3. The kinetic energy entering the waste liquid unit 500 is the kinetic energy of injecting water into the digestion area. Therefore, when the last mixed liquid is colorimetrically analyzed, it is necessary to inject a cleaning agent to push the mixed liquid after digestion into the flow-through unit for colorimetry.

[0074] In the fourth specific embodiment, please refer to Figure 6 , the number of the pipe body 10, the end cap I21, the end cap II22 and the piston 30 is two groups. A plurality of interfaces of the first group of end caps I21 are connected to the water sample pipeline I101, the digestion solution pipeline I201 and the digestion mixed solution pipeline I701. The digestion mixed solution pipeline I701 is an outlet. A plurality of interfaces of the second group of end caps I21 are connected to the digestion mixed solution pipeline III703, the color reagent pipeline I301 and the waste liquid pipeline I501. The digestion mixed solution pipeline III703 is an inlet. A plurality of interfaces of the first group of end caps II22 are connected to the water sample pipeline II102, the digestion solution pipeline II202 and the digestion mixed solution pipeline II702. The digestion mixed solution pipeline II702 is an outlet. A plurality of interfaces of the second group of end caps II22 are connected to the digestion mixed solution pipeline IV704, the color reagent pipeline II302 and the waste liquid pipeline II502. The digestion mixed solution pipeline IV704 is an inlet; the water sample pipeline I101 and the water sample pipeline II102 are respectively communicated with the water sample unit, the digestion solution pipeline I201 and the digestion solution pipeline II202 are respectively communicated with the digestion solution unit 200, the color reagent pipeline I301 and the color reagent pipeline II302 are respectively communicated with the color reagent unit 300, the waste liquid pipeline I501 and the waste liquid pipeline II502 are respectively communicated with the waste liquid unit 500, the digestion mixed solution pipeline I701 is communicated with the digestion mixed solution pipeline III703 and is communicated with the waste liquid unit 500, and the digestion mixed solution pipeline II702 is communicated with the digestion mixed solution pipeline IV704 and is communicated with the waste liquid unit 500.

[0075] In addition, coolers 70 are provided on the pipelines where the digestion mixture pipeline I701 is connected to the digestion mixture pipeline III703 and the digestion mixture pipeline II702 is connected to the digestion mixture pipeline IV704. On both sides outside the second group of pipe bodies 10, a light source emission group 61 and a light source reception group 62 are respectively provided.

[0076] Among them, a peristaltic pump I110 and a peristaltic pump II120 are respectively provided on the water sample pipeline I101 and the water sample pipeline II102. A metering peristaltic pump I210 is provided in the digestion solution unit 200. A metering peristaltic pump II310 is provided in the color reagent unit 300. A pinch valve V-I5010 and a pinch valve V-II5020 are respectively provided on the waste liquid pipeline I501 and the waste liquid pipeline II502. Peristaltic pumps III720 are provided on both the digestion mixture pipeline I701 and the digestion mixture pipeline II702. Pinch valves VII-IV7040 are provided on both the digestion mixture pipeline III703 and the digestion mixture pipeline IV704. Pinch valves V-III5030 are provided between the pinch valves VII-IV7040 and the waste liquid unit 500.

[0077] It should be noted that this implementation mode is a double-pipe mode. The first group is the digestion area, and the second group is the colorimetric detection area. In the specific working process:

[0078] 1. The metering peristaltic pump I210 injects a fixed amount of digestion solution into area B. The peristaltic pump II120 extracts the water sample and fills area B through the water sample pipeline. Heat it up, monitor the temperature and maintain it at 100 degrees Celsius for 30 minutes. After the digestion is completed, the digestion mixture is transported to the cooler 70 by the peristaltic pump III720. First, measure the residual liquid quantity in the pipeline, then open the pinch valve V-III5030 to time or measure and discharge the residual liquid in the pipeline to the waste liquid pool. Close the pinch valve V-III5030, open the metering peristaltic pump II310 to inject a fixed amount of color reagent, open the pinch valve VII-IV7040, inject the digestion mixture into the colorimetric detection area B, evacuate the digestion area, fill the colorimetric detection area, start colorimetry. After the colorimetry is completed, open the pinch valve V-II5020 and the pinch valve V-III5030 to evacuate area B;

[0079] 2. Area A performs the same process, but it is executed in a staggered manner with area B;

[0080] 3. The cleaning process is the same as that of the single pipe and will not be elaborated here.

[0081] It should be noted that the test beam will pass through the tube body 10. The thicker the tube body 10 is, the larger the detected dynamic value will be and the higher the sensitivity will be. Therefore, it is required that the tube body 10 can be thicker and shorter to increase the optical path and improve the detection sensitivity. This photometric element detection device needs parameter calibration, and the error value is compensated digitally. Calibration is carried out using a standard solution. The principle is as follows: for example, when detecting total phosphorus, the treated water sample will absorb the beam energy of the 700 nm wavelength. The higher the total phosphorus content, the more it absorbs. During calibration, a standard solution is used for determination. The receiving end can receive a set of measured data. By comparing this data with the data obtained using the standard solution, a difference is obtained. Using digital technology to compensate for this difference can complete the calibration of one point. Then, calibrate several points according to the gradient, and finally complete the calibration of the entire photometric element detection device. Each data in the actual measurement is a correct value after compensation or correction, and the calibration data is recorded. The data is output in a bus mode so that more photometric element detection devices can be expanded in one device. The device with multiple expanded photometric element detection devices obtains high-density total phosphorus data through time-sharing operation. The parameter calibration of other elements such as total nitrogen also uses a similar method to obtain a calibration array, which can calibrate the data obtained from the actual measurement and obtain the correct detection value.

[0082] In addition, since its detection reaction body, that is, the tube body 10, is designed as a reaction environment that can be reused, continuous measured values can be obtained by injecting different liquid substances to be measured through pipelines without manual intervention during this period. For example, when detecting total phosphorus, the injected substances are water samples, digestion solutions, and color-developing agents, and the final data can be obtained through standard processes such as heating and cooling. Furthermore, experiments with different ratios of the above processes are carried out, and the step size and different combination schemes are set in the program to automatically complete these experiments. Similarly, this device can also perform high-precision testing on total nitrogen. By changing the program and the types of auxiliary reagents, this device can be further expanded into a laboratory device.

[0083] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0084] The photometric element detection device provided by the present invention has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A photometric element detection device, characterized in that, It includes a tube body (10) with end caps I (21) and end caps II (22) provided at both ends respectively. An electric heating wire (50) is wound around the tube body (10). A slidable piston (30) is provided in the tube body (10). The piston (30) divides the inner space of the tube body (10) into a sealed area A near the end cap I (21) and an area B near the end cap II (22). Both the end cap I (21) and the end cap II (22) are provided with a plurality of interfaces, and the interfaces can be connected to a water sample pipeline, a digestion solution pipeline, a color developing agent pipeline, and a waste liquid pipeline; Peristaltic pumps are provided in the water sample pipeline, the digestion solution pipeline, and the color developing agent pipeline.

2. The photometric element detection device according to claim 1, characterized in that, The plurality of interfaces of the end cap I (21) are connected to a water sample pipeline I (101), a digestion solution pipeline I (201), a color developing agent pipeline I (301), a cleaning solution pipeline I (401), and a waste liquid pipeline I (501). The plurality of interfaces of the end cap II (22) are connected to a water sample pipeline II (102), a digestion solution pipeline II (202), a color developing agent pipeline II (302), a cleaning solution pipeline II (402), and a waste liquid pipeline II (502). On both sides outside the tube body (10), a light source emission group (61) and a light source reception group (62) are respectively provided; The water sample pipeline I (101) and the water sample pipeline II (102) are respectively communicated with a water sample unit. The digestion solution pipeline I (201) and the digestion solution pipeline II (202) are respectively communicated with a digestion solution unit (200). The color developing agent pipeline I (301) and the color developing agent pipeline II (302) are respectively communicated with a color developing agent unit (300). The cleaning solution pipeline I (401) and the cleaning solution pipeline II (402) are respectively communicated with a cleaning solution unit (400). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) are respectively communicated with a waste liquid unit (500).

3. The photometric element detection device according to claim 2, characterized in that, The water sample pipeline I (101) and the water sample pipeline II (102) are respectively provided with a peristaltic pump I (110) and a peristaltic pump II (120). The digestion solution pipeline I (201) and the digestion solution pipeline II (202) are respectively provided with a pinch valve II-I (2010) and a pinch valve II-II (2020). The digestion solution unit (200) is provided with a metering peristaltic pump I (210). The color developing agent pipeline I (301) and the color developing agent pipeline II (302) are respectively provided with a pinch valve III-I (3010) and a pinch valve III-II (3020). The color developing agent unit (300) is provided with a metering peristaltic pump II (310). The cleaning solution pipeline I (401) and the cleaning solution pipeline II (402) are respectively provided with a pinch valve IV-I (4010) and a pinch valve IV-II (4020). The cleaning solution unit (400) is provided with a metering peristaltic pump III (410). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) are respectively provided with a pinch valve V-I (5010) and a pinch valve V-II (5020).

4. The photometric element detection device according to claim 1, wherein A plurality of the interfaces of the end cap I (21) are connected to a developer pipeline I (301), a waste liquid pipeline I (501), and a mixed liquid pipeline I (601). A plurality of the interfaces of the end cap II (22) are connected to a water sample pipeline II (102), a digestion solution pipeline II (202), a cleaning solution pipeline I (401), and a mixed liquid pipeline II (602). A cooler (70) is provided on the pipeline where the mixed liquid pipeline II (602) communicates with the mixed liquid pipeline I (601). On both sides outside the pipe body (10), a light source emission group (61) and a light source reception group (62) are respectively provided. The mixed liquid pipeline II (602) communicates with the mixed liquid pipeline I (601). The developer pipeline I (301) communicates with a developer unit (300). The waste liquid pipeline I (501) and the mixed liquid pipeline I (601) communicate with a waste liquid unit (500). The water sample pipeline II (102) communicates with a water sample unit. The digestion solution pipeline II (202) communicates with a digestion solution unit (200). The cleaning solution pipeline I (401) communicates with a cleaning solution unit (400).

5. The photometric element detection device according to claim 4, characterized in that, A metering peristaltic pump IV (610) is provided between the mixed liquid pipeline II (602) and the mixed liquid pipeline I (601). A metering peristaltic pump II (310) is provided between the developer unit (300) and the developer pipeline I (301). A pinch valve V-III (5030) and a pinch valve V-IV (5040) are respectively provided on the waste liquid pipeline I (501) and the mixed liquid pipeline I (601). A pinch valve VI-I (6010) is provided between the mixed liquid pipeline I (601) and the pinch valve V-IV (5040). A peristaltic pump II (120) is provided on the water sample pipeline II (102). A metering peristaltic pump I (210) is provided in the digestion solution unit (200). A metering peristaltic pump III (410) is provided in the cleaning solution unit (400).

6. The photometric element detection device according to claim 1, wherein A plurality of the interfaces of the end cap I (21) are connected to a water sample pipeline I (101), a digestion solution pipeline I (201), a cleaning solution pipeline I (401), and a waste liquid pipeline I (501). A plurality of the interfaces of the end cap II (22) are connected to a water sample pipeline II (102), a digestion solution pipeline II (202), a cleaning solution pipeline II (402), and a waste liquid pipeline II (502). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) respectively communicate with a circulation unit. On both sides outside the circulation unit, a light source emission group (61) and a light source reception group (62) are respectively provided. The water sample pipeline I (101) and the water sample pipeline II (102) are respectively connected to the water sample unit. The digestion solution pipeline I (201) and the digestion solution pipeline II (202) are respectively connected to the digestion solution unit (200). The cleaning solution pipeline I (401) and the cleaning solution pipeline II (402) are respectively connected to the cleaning solution unit (400). The flow-through unit is respectively connected to the color reagent unit (300) and the waste liquid unit (500).

7. The photometric element detection device according to claim 6, characterized in that The water sample pipeline I (101) and the water sample pipeline II (102) are respectively provided with a peristaltic pump I (110) and a peristaltic pump II (120). The digestion solution pipeline I (201) and the digestion solution pipeline II (202) are respectively provided with a pinch valve II-I (2010) and a pinch valve II-II (2020). The digestion solution unit (200) is provided with a metering peristaltic pump I (210). The cleaning solution pipeline I (401) and the cleaning solution pipeline II (402) are respectively provided with a pinch valve IV-I (4010) and a pinch valve IV-II (4020). The cleaning solution unit (400) is provided with a metering peristaltic pump III (410). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) are respectively provided with a pinch valve V-I (5010) and a pinch valve V-II (5020). The color reagent unit (300) is provided with a metering peristaltic pump II (310). A pinch valve V-V (5050) is provided between the flow-through unit and the waste liquid unit (500).

8. The photometric element detection device according to claim 1, characterized in that, The number of the pipe body (10), the end cap I (21), the end cap II (22) and the piston (30) is two groups. Multiple interfaces of the first group of the end cap I (21) are connected to the water sample pipeline I (101), the digestion solution pipeline I (201) and the digestion mixture pipeline I (701). Multiple interfaces of the second group of the end cap I (21) are connected to the digestion mixture pipeline III (703), the color reagent pipeline I (301) and the waste liquid pipeline I (501). Multiple interfaces of the first group of the end cap II (22) are connected to the water sample pipeline II (102), the digestion solution pipeline II (202) and the digestion mixture pipeline II (702). Multiple interfaces of the second group of the end cap II (22) are connected to the digestion mixture pipeline IV (704), the color reagent pipeline II (302) and the waste liquid pipeline II (502); The water sample pipeline I (101) and the water sample pipeline II (102) are respectively connected to the water sample unit. The digestion solution pipeline I (201) and the digestion solution pipeline II (202) are respectively connected to the digestion solution unit (200). The color reagent pipeline I (301) and the color reagent pipeline II (302) are respectively connected to the color reagent unit (300). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) are respectively connected to the waste liquid unit (500). The digestion mixture pipeline I (701) is connected to the digestion mixture pipeline III (703) and is connected to the waste liquid unit (500). The digestion mixture pipeline II (702) is connected to the digestion mixture pipeline IV (704) and is connected to the waste liquid unit (500).

9. The photometric element detection device according to claim 8, characterized in that, The water sample pipeline I (101) and the water sample pipeline II (102) are respectively provided with a peristaltic pump I (110) and a peristaltic pump II (120). The digestion solution unit (200) is provided with a metering peristaltic pump I (210). The color reagent unit (300) is provided with a metering peristaltic pump II (310). The waste liquid pipeline I (501) and the waste liquid pipeline II (502) are respectively provided with a pinch valve V-I (5010) and a pinch valve V-II (5020). The digestion mixture pipeline I (701) and the digestion mixture pipeline II (702) are both provided with a peristaltic pump III (720). The digestion mixture pipeline III (703) and the digestion mixture pipeline IV (704) are both provided with a pinch valve VII-IV (7040). A pinch valve V-III (5030) is provided between the pinch valve VII-IV (7040) and the waste liquid unit (500).

10. The photometric element detection device according to claim 9, characterized in that, Coolers (70) are provided on the pipelines where the digestion mixture pipeline I (701) is connected to the digestion mixture pipeline III (703) and the digestion mixture pipeline II (702) is connected to the digestion mixture pipeline IV (704). On both sides outside the second group of pipe bodies (10), a light source emission group (61) and a light source reception group (62) are respectively provided.

Images