Total nitrogen water quality on-line automatic detection analyzer

Abstract

The utility model discloses a total nitrogen water quality on-line automatic detection analyzer, which belongs to the technical field of water quality detection, and comprises a box body and a total nitrogen detection system, and the front side of the box body is hinged with an electric door; the total nitrogen detection system comprises a mounting back plate and a plurality of matched detection components which are integrally arranged on the mounting back plate and are used for detecting the total nitrogen of a water sample; the mounting back plate is arranged in the box body and divides the box body into a front side cavity and a rear side cavity which correspond to each other front and back; a plurality of reagent bottles containing different solutions are placed in the rear cavity, and the detection component can selectively extract reagents in the reagent bottles for calibration, detection or automatic cleaning. According to the utility model, the total nitrogen content in a water sample can be rapidly and accurately measured by adopting an optical principle and an ultraviolet fluorescence technology, and the device has the advantages of high precision, high sensitivity, high stability and the like, can stably run for a long time under the condition of water quality in a relatively wide range, and realizes on-line automatic detection and data acquisition.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality detection, in particular to an online automatic detection analyzer for total nitrogen water quality. Background Art

[0002] The determination of total nitrogen content in environmental water samples is a must-measure item in environmental monitoring. The accuracy of the determination has always been a problem. The current method for determining total nitrogen in water quality is the national environmental protection standard HJ636-2012 "Determination of total nitrogen in water quality by alkaline potassium persulfate digestion ultraviolet spectrophotometry". Specifically, add alkaline potassium persulfate solution to the colorimetric bottle containing the water sample, seal the colorimetric bottle and place it in a high-pressure steam sterilizer, heat and maintain the temperature at 120-124℃ for 30 minutes, cool to room temperature, add hydrochloric acid solution to the colorimetric tube, use a quartz colorimetric dish on a UV spectrophotometer, use water as a reference, measure the absorbance at wavelengths of 220nm and 275nm, and draw a calibration standard curve.

[0003] Existing water quality total nitrogen analysis devices generally include the steps of collecting fresh water samples, preparing alkaline potassium persulfate solution, preparing potassium nitrate standard solution, preparing hydrochloric acid solution, using digestion reagent bottles for digestion detection, and returning calibration curves. The digestion reagent bottles also need to be placed in a steam sterilizer for disinfection. This type of detection analyzer has a low degree of automation and requires personnel to perform corresponding manual operations according to the detection steps. There are large human operation errors during the operation process, resulting in low detection accuracy. The cumbersome operation process leads to low detection efficiency, which is difficult to meet some work occasions for continuous water quality total nitrogen detection. Utility Model Content

[0004] The technical problem solved by the utility model is as follows: In view of the shortcomings of the total nitrogen analysis device of water quality in the prior art in the actual working process, the utility model provides an online automatic detection analyzer for total nitrogen water quality, which has a high degree of automation and can meet the requirements of real-time online detection of total nitrogen in water quality, thereby improving the detection efficiency of total nitrogen in water quality.

[0005] Technical solution: The utility model discloses an online automatic total nitrogen water quality detection analyzer, the analyzer comprises:

[0006] A box body, wherein an electric door is hingedly connected to the front side of the box body;

[0007] A total nitrogen detection system, the total nitrogen detection system comprising a mounting back plate and a plurality of matching detection components integrated on the mounting back plate for detecting total nitrogen in a water sample; the mounting back plate is placed in the box body to separate the box body into a front side cavity and a rear side cavity corresponding to the front and rear sides;

[0008] Among them, a number of reagent bottles containing different solutions are placed in the rear cavity, and the detection component can selectively extract reagents from the reagent bottles for calibration, detection or automatic cleaning.

[0009] Preferably, the detection components include a peristaltic pump, a digestion tank, a valve island, a metering mechanism, a first high-temperature valve, a second high-temperature valve, a three-way joint, an air valve and a waste liquid valve; a pipeline connection port corresponding to the valve island is provided on one side of the box;

[0010] The three ports of the three-way connector are respectively connected to the outlet of the peristaltic pump, the inlet of the metering mechanism and the outlet of the air valve through the delivery pipeline;

[0011] The common end at the top of the valve island is connected to the outlet end of the metering mechanism, the common end on the right side of the valve island is connected to the inlet end and the outlet end of the digestion tank through the first high-temperature valve and the second high-temperature valve respectively, the left port of the valve island is connected to the water quality sampling port and several reagent bottles respectively, the common end at the bottom of the valve island is connected to the waste liquid valve, and the waste liquid valve is connected to the waste liquid bottle through a delivery pipeline.

[0012] Preferably, the reagent bottles include a pure water reagent bottle, a digestion reagent bottle, a color development reagent bottle, an acid reagent bottle and a standard sample reagent bottle which are sequentially connected to the valve island.

[0013] Preferably, the inlet end of the peristaltic pump is connected to the air, and the outlet end thereof is connected to the three-way joint. The peristaltic pump compresses the hose or pipe to generate peristalsis inside the hose or pipe to push or extract the liquid to the target location;

[0014] A peristaltic pump motor and a peristaltic pump driver are fixedly mounted on the back side of the mounting back plate, a driving shaft of the peristaltic pump motor passes through the mounting back plate and is transmission-connected to the peristaltic pump, and the peristaltic pump motor is connected to the peristaltic pump driver.

[0015] Preferably, the digestion tank comprises a support frame with open front and rear sides, and a front cover plate and a rear cover plate correspondingly sealed and connected to the front and rear sides of the support frame, and at least one cooling fan is arranged on the rear cover plate;

[0016] A digestion tube is arranged between the upper and lower end plates of the support frame, and sealing columns are respectively arranged at the upper and lower ends of the digestion tube, and the sealing columns are respectively fixedly connected to the support frame through fixing nuts;

[0017] The two side plates of the support frame are provided with a dissipation light source transmitting end and a dissipation light source receiving end, and through holes for light to pass through are opened on both sides of the support frame;

[0018] The digestion light source emitting end emits light that passes through the digestion tube, and the digestion light source receiving end receives the light to measure the absorbance of the digested solution.

[0019] Preferably, the top end of the digestion tube is connected to the first high-temperature valve through a pipeline, and the bottom end thereof is connected to the second high-temperature valve through a pipeline;

[0020] A heating wire is wound around the surface of the digestion tube, and the heating wire is connected to the heating wire assembly through a wire passing through the mounting back plate. A temperature sensor is also arranged on one side of the digestion tube.

[0021] Preferably, the metering mechanism comprises a metering frame and a metering tube longitudinally arranged in the metering frame, the upper end of the metering tube is connected to the three-way joint through a pipeline, and the lower end of the metering tube is connected to one of the pipeline interfaces of the valve island through a pipeline;

[0022] A high-position light source transmitting end and a high-position light source receiving end, a low-position light source transmitting end and a low-position light source receiving end are respectively arranged on both sides of the upper and lower ends of the metering tube.

[0023] Preferably, a signal transmission panel is provided on the side wall of the box, and the signal transmission panel is provided with a 220V power input terminal including a switch and fuse protection, a USB socket interface, a Micro-USB interface for debugging the control circuit, a 485 interface, a 232 interface for signal output and a self-priming pump socket for controlling an external self-priming pump.

[0024] Preferably, a hinge joint connected to the inner wall of the box is provided on one side of the installation back plate, and a rotary lock is provided on the other side of the installation back plate. Opening the rotary lock can drive the installation back plate to open outward along the hinge joint.

[0025] Preferably, a touch screen is provided at the top of the electric door, an observation window is provided at the bottom of the electric door, and a buckle lock is provided on the side of the electric door away from the hinged part;

[0026] The side wall of the box body is provided with air holes and a ventilation fan;

[0027] Lifting handles are correspondingly arranged on both sides of the box body.

[0028] Compared with the prior art, the utility model has at least the following beneficial effects:

[0029] 1. The utility model can monitor the total nitrogen content of water samples in real time. The analyzer adopts optical principles and ultraviolet fluorescence technology to quickly and accurately measure the total nitrogen content in water samples. It has the advantages of high precision, high sensitivity, high stability, etc. It can operate stably and for a long time under a wide range of water quality conditions, and realize online automatic detection and data collection of the total nitrogen content of water samples;

[0030] 2. The analyzer adopts advanced automatic calibration and automatic cleaning functions, which can automatically perform reference calibration and self-cleaning processing, so that the stability and accuracy of the analyzer are effectively guaranteed. At the same time, the analyzer is also equipped with a complete data processing and alarm device, which monitors data in real time and sends alarm information in time when the total nitrogen in water quality reaches the warning value, reminding the operator to take corresponding measures, effectively ensuring the safety and stability of water quality;

[0031] 3. The analyzer can realize online real-time detection of water quality efficiently, accurately and reliably, and has broad application prospects. It has important application value in the fields of water quality monitoring, environmental protection, water resources management, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the analyzer of the utility model from the first perspective;

[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the analyzer from the second perspective;

[0034] Figure 3 for Figure 1 Main view of the device installation structure on the middle installation backplane;

[0035] Figure 4 for Figure 1 Main view of the signal transmission panel structure;

[0036] Figure 5 for Figure 3 The first-person structural diagram of the middle digestion tank;

[0037] Figure 6 for Figure 5 The structural diagram of the middle digestion tank from the second perspective;

[0038] Figure 7 for Figure 5 Main view of the internal structure of the middle digestion tank;

[0039] Figure 8 for Figure 3 Main view of the structure of the middle metering mechanism;

[0040] Fig. 9 for Figure 1 Schematic diagram of the reagent bottle structure in the middle and rear cavity.

[0041] Figure numerals: 100, analyzer; 1, box; 101, front cavity; 102, rear cavity; 2, electrical door; 3, touch screen; 4, buckle lock; 5, observation window; 6, hinge joint; 7, mounting back plate; 8, signal transmission panel; 801, 220V power input terminal; 802, USB socket interface; 803, Micro-usb interface; 804, 485 interface; 805, 232 interface; 806, self-priming pump socket; 9, lifting handle; 10, pipeline connection port; 11, air vent; 12, rotating lock; 13, peristaltic pump; 14, digestion tank; 141, support frame; 142, front cover plate; 143, rear cover plate; 14 4. Cooling fan; 145. Digestion tube; 146. Sealing column; 147. Fixing nut; 148. Digestion light source transmitting end; 149. Digestion light source receiving end; 15. Valve island; 16. Measuring mechanism; 161. Measuring frame; 162. Measuring tube; 163. High-position light source transmitting end; 164. High-position light source receiving end; 165. Low-position light source transmitting end; 166. Low-position light source receiving end; 17. First high-temperature valve; 18. Second high-temperature valve; 19. Three-way connector; 20. Air valve; 21. Waste liquid valve; 22. Ventilation fan; 23. Pure water reagent bottle; 24. Digestion reagent bottle; 25. Colorimetric reagent bottle; 26. Acid reagent bottle; 27. Standard reagent bottle. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will be combined with the attached Figures 1 to 9 The technical solution of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the utility model.

[0043] like Figure 1~2 In the illustrated embodiment, the utility model discloses an online automatic total nitrogen water quality analyzer, the analyzer 100 includes a box 1, a total nitrogen detection system, an electric door 2 is hinged on the front side of the box 1, a touch screen 3 is provided on the top of the electric door 2, and an observation window 5 is provided at the bottom of the electric door 2, and the observation window 5 is made of transparent glass or acrylic plate; one side of the electric door 2 is hinged to the box 1 through a hinge, and a buckle 4 is provided on the side of the electric door 2 away from the hinge, and the box 1 and the electric door 2 can be fixedly locked by the buckle 4. The side wall of the box 1 is provided with air holes 11 and ventilation fans 22. Specifically, air holes 11 are provided on the lower parts of both sides of the box 1, and one or two, or even more ventilation fans 22 are provided on the upper parts of both sides of the box 1 to realize forced ventilation inside the box 1. Lifting handles 9 are provided on both sides of the box 1, and the analyzer 100 can be moved and transported by the lifting handles 9. Conical feet are provided at the four corners of the bottom of the box 1.

[0044] like Figures 1 to 3 As shown, the total nitrogen detection system includes a mounting back plate 7 and a plurality of matching detection components integrated on the mounting back plate 7 for detecting total nitrogen in water samples; the mounting back plate 7 is placed in the box body 1 to divide the box body 1 into a front cavity 101 and a rear cavity 102 corresponding to each other; a hinge joint 6 connected to the inner wall of the box body 1 is provided on one side of the mounting back plate 7, and a rotary lock 12 is provided on the side of the mounting back plate 7 away from the hinge joint 6. Opening the rotary lock 12 can drive the mounting back plate 7 to open outward along the hinge joint 6, thereby realizing the connection between the front cavity 101 and the rear cavity 102. The detection components include a peristaltic pump 13, a digestion tank 14, a valve island 15, a metering mechanism 16, a first high-temperature valve 17, a second high-temperature valve 18, a three-way joint 19, an air valve 20 and a waste liquid valve 21. The inlet end of the peristaltic pump 13 is connected to the air, and the outlet end thereof is connected to the three-way joint 19. The peristaltic pump 13 compresses the hose or pipe to generate peristalsis inside it to push or extract the liquid to the target position; a peristaltic pump motor (not shown in the figure) and a peristaltic pump driver (not shown in the figure) are fixedly installed on the back side of the mounting back plate 7. The driving shaft of the peristaltic pump motor passes through the mounting back plate 7 and is transmission-connected to the peristaltic pump 13, and the peristaltic pump motor is connected to the peristaltic pump driver. By controlling the peristaltic pump driver, the peristaltic pump motor can be controlled to start and drive the rotation of the peristaltic pump 13. The three ports of the three-way connector 19 are connected to the outlet of the peristaltic pump 13, the inlet of the metering mechanism 16 and the outlet of the air valve 20 through the delivery pipeline; the top common end of the valve island 15 is connected to the outlet of the metering mechanism 16, the right common end of the valve island 15 is connected to the inlet and outlet of the digestion tank 14 through the first high-temperature valve 17 and the second high-temperature valve 18, the left port of the valve island 15 is connected to the water quality sampling port and several reagent bottles, the bottom common end of the valve island 15 is connected to the waste liquid valve 21, and the waste liquid valve 21 is connected to the waste liquid bottle through the delivery pipeline. A pipeline connection port 10 corresponding to the valve island 15 is provided on one side of the box body 1, and the pipeline connection port 10 can be connected to the water sample storage tank to be tested through a delivery hose.

[0045] like Fig. 9As shown, several reagent bottles containing different solutions are placed in the rear cavity 102, and the reagent bottles include a pure water reagent bottle 23, a digestion reagent bottle 24, a color reagent bottle 25, an acid reagent bottle 26 and a standard reagent bottle 27 which are connected to the valve island 15 in sequence. The standard reagent bottle 27 contains a standard sample, which is a 25mg / L potassium nitrate solution. The potassium nitrate solution is prepared by adding 0.18g of potassium nitrate to 950mL of distilled water, and mixing after the volume is fixed to 1000ml. The pure water reagent bottle contains a pure water sample, which is distilled water. The digestion reagent bottle contains a digester, which is a mixed solution of 7.5g of sodium hydroxide and 20g of potassium persulfate. The color reagent bottle contains a color developer, which is 5g / L of resorcinol. The acid reagent bottle contains an acidic agent, which is 75% concentrated sulfuric acid. After the required reagents are prepared according to the above reagent requirements, they are injected into the corresponding reagent bottles, and then the reagent bottles are placed in the rear cavity 102 of the box 1, which can meet the needs of multiple tests on water samples. When the corresponding test reagents are consumed, they can be replaced. The analyzer is equipped with a pure water reagent bottle, which contains distilled water. After completing a water quality total nitrogen test, the distilled water can be circulated along the detection system 1 to 3 times using the same working method to complete the automatic cleaning of the equipment. The analysis is equipped with a standard sample reagent bottle, which can automatically perform reference calibration on the detection system and improve the accuracy of the analyzer's detection.

[0046] like Figures 5 to 7 As shown, the digestion tank 14 includes a support frame 141 with open front and rear sides, and a front cover plate 142 and a rear cover plate 143 correspondingly connected to the front and rear sides of the support frame 141 in a sealed manner. The rear cover plate 143 is provided with at least one cooling fan 144. Specifically, a cooling fan is provided at the upper and lower ends of the rear cover plate 143. A digestion tube 145 is provided between the upper and lower end plates of the support frame 141. The upper and lower ends of the digestion tube 145 are respectively provided with sealing columns 146, and the sealing columns 146 are respectively fixedly connected to the support frame 141 through fixing nuts 147; a digestion light source emitting end 148 and a digestion light source receiving end 149 are correspondingly provided on the outer plates of the two sides of the support frame 141, and through holes for light to pass through are correspondingly opened on both sides of the support frame 141; the digestion light source emitting end 148 emits light to pass through the digestion tube 145, and the digestion light source receiving end 149 receives the light to measure the absorbance of the digested solution. The top of the digestion tube 145 is connected to the first high-temperature valve 17 through a pipeline, and the bottom of the digestion tube 145 is connected to the second high-temperature valve 18 through a pipeline; a heating wire (not shown in the figure) is wrapped around the surface of the digestion tube 145, and the heating wire is connected to the heating wire assembly through a wire passing through the mounting back plate 7. A temperature sensor (not shown in the figure) is also provided on one side of the digestion tube 145. The heating temperature is set by the heating wire assembly and the heating wire is controlled to heat the digestion tube 145. The temperature sensor detects the digestion tube 145 in real time and feeds back to the heating wire assembly to control the heating wire to heat or stop heating.

[0047] like Figure 8 As shown, the metering mechanism 16 includes a metering frame 161 and a metering tube 162 longitudinally arranged in the metering frame 161. The upper end of the metering tube 162 is connected to the three-way joint 19 through a pipeline, and the lower end thereof is connected to one of the pipeline interfaces of the valve island 15 through a pipeline, so as to ensure the smooth flow and precise control of the fluid; a high-position light source emitting end 163 and a high-position light source receiving end 164, a low-position light source emitting end 165 and a low-position light source receiving end 166 are respectively arranged on both sides of the upper and lower ends of the metering tube 162. The metering mechanism 16 arranged in this way realizes the volume measurement of the liquid flowing through by detecting the change of the liquid level in the metering tube 162.

[0048] like Figure 4 As shown, a signal transmission panel 8 is provided on the side wall of the box body 1, and a 220V power input terminal 801 including a switch and a fuse protection, a USB socket interface 802, a Micro-USB interface 803 for debugging the control circuit, a 485 interface 804, a 232 interface 805 for signal output, and a self-priming pump socket 806 for controlling an external self-priming pump are provided on the signal transmission panel 8.

[0049] It should be noted that the analyzer 100 of the utility model also includes a control system integrated with the prior art. The detection components in the total phosphorus detection system are connected to the control system through wires. For example, the peristaltic pump motor, peristaltic pump driver, solenoid valve in the valve island, low-level light source transmitting end, low-level light source receiving end, high-level light source transmitting end, high-level light source receiving end, detection light source transmitting end and detection light source receiving end in the total phosphorus detection system are all connected to the control system through wires. The control system includes a control circuit and a touch screen. The control circuit is arranged in the box, and the touch screen is installed on the electrical door. The control system controls the operation of various components of the analyzer according to the preset process. A data acquisition device is integrated in the control system, which can convert, store and transmit the data collected by the total phosphorus detection system. The existing technologies including analog-to-digital converter (ADC) technology and digital signal processing technology are adopted to convert the analog signal collected by the total phosphorus detection system into a digital signal, and then transmit it to the data processing unit for processing. A data processing unit is integrated in the control system. The main functions of the data processing unit include data storage, data analysis and alarm control. The data processing unit adopts existing processing technologies including fuzzy logic, neural network, genetic algorithm, etc., which can process and analyze the collected data, and automatically alarm or automatically control according to a preset threshold. A communication module is integrated in the control system. The communication module adopts two modes of wired communication and wireless communication, such as Ethernet, RS485, GPRS, WIFI and other existing technologies, and the collected data can be transmitted to the control system through a touch screen digital display or a remote monitoring center. The above-mentioned functional modules integrated in the control system can all be integrated with existing technologies to realize their functions, which will not be repeated here. An alarm device can also be integrated on the box, such as using an audible and visual alarm, and data processing and alarm warning can be realized through the signal transmission panel 8 and the alarm device, real-time monitoring data, and timely sending alarm information when the total nitrogen content of the water quality reaches the warning value, reminding the operator to carry out corresponding disposal, and effectively ensuring the safety and stability of the water quality.

[0050] The working principle or working method of the utility model:

[0051] During operation, the solenoid valve of the water quality sampling port in the valve island 15 is opened, and the peristaltic pump 13 is started to extract water samples through the water quality sampling port into the metering mechanism 16. After the volume is measured by the metering mechanism 16, the first high-temperature valve 17 and the second high-temperature valve 18 are opened, and the peristaltic pump 13 is started to inject the water sample into the digestion tank 14. The solenoid valves corresponding to one or a combination of multiple reagent bottles of the valve island 15 are selectively opened, and the peristaltic pump 13 is used to extract the reagents in the reagent bottles into the metering mechanism 16. After the volume is measured by the metering mechanism 16, the first high-temperature valve and the second high-temperature valve corresponding to the detection tank are opened, and the digester, the color developer, and the acid agent are injected into the digestion tube 145 in turn. After all the detection reagents are injected, the first high-temperature valve 17 and the second high-temperature valve 18 are closed. The digestion tube 145 is heated by the heating wire to digest. The temperature sensor set on one side of the digestion tube 145 can feedback the heating temperature. After the digestion is completed, the cooling fan 144 is started to cool the digestion tube; after cooling, the digestion light source transmitting end 148 and the digestion light source receiving end 149 are started. The digestion light source is 365nm. The analyzer 100 analyzes the color change before and after digestion, and converts this change into an AD value for digital display and storage through the touch screen 3. The waste liquid after digestion is first sucked into the metering mechanism 16 through the valve island 15, the first high-temperature valve 17 and the second high-temperature valve 18, and then the passages of the first high-temperature valve 17 and the second high-temperature valve 18 are closed, and the waste liquid valve 21 is opened to inject the waste liquid in the metering mechanism into the waste liquid bottle through the waste liquid valve.

[0052] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A total nitrogen water quality online automatic detection analyzer, characterized in that: The analyzer (100) comprises: A box body (1), wherein an electric door (2) is hingedly connected to the front side of the box body (1); A total nitrogen detection system, the total nitrogen detection system comprising a mounting back plate (7) and a plurality of matching detection components integrated on the mounting back plate (7) for detecting total nitrogen in a water sample; the mounting back plate (7) is placed in the box (1) to separate the box (1) into a front cavity (101) and a rear cavity (102) corresponding to each other; A plurality of reagent bottles containing different solutions are placed in the rear cavity (102), and the detection component can selectively extract reagents from the reagent bottles for calibration, detection or automatic cleaning.

2. The total nitrogen water quality online automatic detection analyzer according to claim 1 is characterized in that: The detection components include a peristaltic pump (13), a digestion tank (14), a valve island (15), a metering mechanism (16), a first high-temperature valve (17), a second high-temperature valve (18), a three-way connector (19), an air valve (20) and a waste liquid valve (21); a pipeline connection port (10) corresponding to the valve island (15) is provided on one side of the box; The three ports of the three-way connector (19) are respectively connected to the outlet of the peristaltic pump (13), the inlet of the metering mechanism (16) and the outlet of the air valve (20) through the delivery pipeline; The top common end of the valve island (15) is connected to the outlet end of the metering mechanism (16); the right common end of the valve island (15) is connected to the inlet end and the outlet end of the digestion tank (14) through a first high-temperature valve (17) and a second high-temperature valve (18), respectively; the left port of the valve island (15) is connected to a water quality sampling port and a plurality of reagent bottles, respectively; the bottom common end of the valve island (15) is connected to a waste liquid valve (21); and the waste liquid valve (21) is connected to a waste liquid bottle through a delivery pipeline.

3. The total nitrogen water quality online automatic detection analyzer according to claim 2 is characterized in that: The reagent bottles include a pure water reagent bottle (23), a digestion reagent bottle (24), a color development reagent bottle (25), an acid reagent bottle (26), and a standard sample reagent bottle (27) which are sequentially connected to the valve island (15).

4. The total nitrogen water quality online automatic detection analyzer according to claim 2 is characterized in that: The inlet end of the peristaltic pump (13) is connected to the air, and the outlet end thereof is connected to the three-way joint (19). The peristaltic pump (13) compresses the hose or pipe to generate peristalsis inside the hose or pipe to push or extract the liquid to the target location; A peristaltic pump motor and a peristaltic pump driver are fixedly mounted on the back side of the mounting back plate (7); a drive shaft of the peristaltic pump motor passes through the mounting back plate (7) and is transmission-connected to the peristaltic pump (13); and the peristaltic pump motor is connected to the peristaltic pump driver.

5. The total nitrogen water quality online automatic detection analyzer according to claim 2 is characterized in that: The digestion tank (14) comprises a support frame (141) with front and rear sides open, and a front cover plate (142) and a rear cover plate (143) correspondingly connected to the front and rear sides of the support frame (141) in a sealed manner, wherein at least one cooling fan (144) is provided on the rear cover plate (143); A digestion tube (145) is provided between the upper and lower end plates of the support frame (141), and sealing columns (146) are provided at the upper and lower ends of the digestion tube (145), respectively, and the sealing columns (146) are fixedly connected to the support frame (141) via fixing nuts (147); The two side plates of the support frame (141) are provided with a digestion light source transmitting end (148) and a digestion light source receiving end (149) correspondingly, and through holes for light to pass through are provided on the two sides of the support frame (141); The digestion light source emitting end (148) emits light that passes through the digestion tube (145), and the digestion light source receiving end (149) receives the light to measure the absorbance of the solution after digestion.

6. The total nitrogen water quality online automatic detection analyzer according to claim 5 is characterized in that: The top end of the digestion tube (145) is connected to the first high-temperature valve (17) through a pipeline, and the bottom end thereof is connected to the second high-temperature valve (18) through a pipeline; A heating wire is wound around the surface of the digestion tube (145), and the heating wire is connected to the heating wire assembly through a wire passing through the mounting back plate (7). A temperature sensor is also provided on one side of the digestion tube (145).

7. The total nitrogen water quality online automatic detection analyzer according to claim 2 is characterized in that: The metering mechanism (16) comprises a metering frame (161) and a metering tube (162) longitudinally arranged in the metering frame (161); the upper end of the metering tube (162) is connected to the three-way joint (19) through a pipeline, and the lower end of the metering tube (162) is connected to a pipeline interface of the valve island (15) through a pipeline; A high-position light source transmitting end (163) and a high-position light source receiving end (164), a low-position light source transmitting end (165) and a low-position light source receiving end (166) are respectively provided on both sides of the upper and lower ends of the metering tube (162).

8. The total nitrogen water quality online automatic detection analyzer according to claim 1 is characterized in that: The side wall of the box body (1) is provided with a signal transmission panel (8), and the signal transmission panel (8) is provided with a 220V power input terminal (801) including a switch and a fuse protection, a USB socket interface (802), a Micro-USB interface (803) for debugging the control circuit, a 485 interface (804), a 232 interface (805) for signal output, and a self-priming pump socket (806) for controlling an external self-priming pump.

9. The total nitrogen water quality online automatic detection analyzer according to claim 1, characterized in that: A hinged joint (6) connected to the inner wall of the box body (1) is provided on one side of the installation back plate (7), and a rotary lock (12) is provided on the other side of the installation back plate (7). When the rotary lock (12) is opened, the installation back plate (7) can be driven to open outward along the hinged joint (6).

10. The total nitrogen water quality online automatic detection analyzer according to claim 1, characterized in that: The top of the electric door (2) is provided with a touch screen (3), the bottom of the electric door (2) is provided with an observation window (5), and a buckle (4) is provided on the side of the electric door (2) away from the hinged portion; The side wall of the box body (1) is provided with air holes (11) and a ventilation fan (22); Lifting handles (9) are correspondingly provided on both sides of the box body (1).

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