CN216978921U

CN216978921U - Ammonia nitrogen detection device

Info

Publication number: CN216978921U
Application number: CN202220114967.2U
Authority: CN
Inventors: 不公告发明人
Original assignee: Quantaeye Beijing Technology Co ltd
Current assignee: Quantaeye Beijing Technology Co ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-07-15
Anticipated expiration: 2032-01-17

Abstract

The application provides an ammonia nitrogen detection device. This ammonia nitrogen detection device includes: a conversion module (1) comprising an anode electrode (11) and a cathode electrode (12), the anode electrode (11) and the cathode electrode (12) being used for electrolyzing a liquid to be tested to generate ammonia gas; a detection module (2), the detection module (2) comprising: the device comprises a detection bin (21) and a detection unit, wherein the detection bin (21) is used for storing medium liquid (24); wherein: the detection bin (21) is provided with an opening, the opening is provided with a breathable film (23), ammonia gas can enter the detection bin (21) through the breathable film (23) to react with the intermediary liquid (24), and the detection unit is positioned in the detection bin (21) and used for detecting the ammonia gas. This application improves the basicity of waiting to detect the liquid through the mode of electrolysis, promotes the ammonium ion to turn into the ammonia, and rethread detection module (2) detect the content of ammonia, and then calculate the content of ammonium ion in waiting to detect the liquid, and the method is simple, and the practicality is strong, the miniaturization of the check out test set of being convenient for.

Description

Ammonia nitrogen detection device

Technical Field

The application relates to the technical field of sensors, in particular to an ammonia nitrogen detection device.

Background

The ammonia nitrogen wastewater mainly comes from the industries of chemical fertilizers, coking, petrifaction, pharmacy, food and the like, refuse landfills and the like, and a large amount of ammonia nitrogen wastewater is discharged into water, so that not only is the water eutrophication caused, but also the black and odorous water is caused, the difficulty and the cost of water treatment are increased, and even a toxic effect on organisms is generated. Therefore, it is very important to detect the content of ammonia nitrogen (mainly the content of ammonium ions) in the water body.

The more common detection of the ammonia nitrogen content is to detect a sample of the liquid to be detected on a detection table, and few on-line detections of the liquid to be detected are carried out.

In the prior art, an ammonia gas sensitive electrode method is also available, wherein a pH glass electrode is used as an indicating electrode, and a silver-silver chloride electrode is used as a reference electrode. The electrode pair is arranged in a plastic sleeve filled with 0.1mol/L ammonium chloride electrolyte, and a hydrophobic semi-permeable film is arranged at the position, close to the indicating electrode, of the end part of the sleeve, so that the electrolyte in the sleeve is separated from the external liquid to be measured. Adding strong alkali solution into the liquid to be detected, increasing the pH of the liquid to be detected to more than 11, converting ammonium salt in the liquid to ammonia gas, enabling the ammonia gas to enter a sleeve provided with an electrode pair (the liquid cannot pass through) through a semipermeable membrane, causing the concentration of hydroxyl ions in the sleeve to change, and detecting the change of the pH glass electrode to obtain the ammonia gas content. The ammonia gas content is in linear relation with the concentration of the ammonium ions in the liquid to be detected, and the concentration of the ammonium ions in the liquid to be detected can be obtained through certain mathematical operation.

The ammonia gas sensitive electrode method can be used for on-line detection, but the method needs to add alkaline substances into the liquid to be detected, so that the method is not environment-friendly enough; the space for storing alkaline substances is required to be arranged in the detection equipment, so that the miniaturization of the equipment is not facilitated; the detection equipment needs to be fished out regularly to supplement alkaline substances, so that the long-time use is not facilitated, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve or improve the problem that mentions in the background art, this application provides an ammonia nitrogen detection device.

This ammonia nitrogen monitoring devices includes:

the conversion module comprises an anode electrode and a cathode electrode, and the anode electrode and the cathode electrode are used for electrolyzing liquid to be detected to generate ammonia gas;

a detection module, the detection module comprising: the detection bin is used for storing the medium liquid; wherein: the detection bin is provided with an opening, the opening is provided with a breathable film, ammonia gas can enter the detection bin through the breathable film to react with the intermediate liquid, and the detection unit is located in the detection bin and used for detecting the ammonia gas.

In at least one embodiment, the detection unit is one of a conductivity electrode, an inductive conductivity sensor, a pH electrode, a capacitive sensor.

In at least one embodiment, the anode electrode is cylindrical and the cathode electrode is in the form of a circular disk.

In at least one embodiment, the cathode electrode is parallel to the cross-section of the anode electrode.

In at least one embodiment, the diameter of the anode electrode is greater than the diameter of the cathode electrode, the cathode electrode being disposed within the anode electrode.

In at least one embodiment, the distance between the end face of the cathode electrode close to the gas permeable membrane and the gas permeable membrane is not less than the distance between the end face of the anode electrode close to the gas permeable membrane and the gas permeable membrane in the direction perpendicular to the gas permeable membrane, and the projection of the cathode electrode on the end face of the anode electrode is located at the center position of the end face of the anode electrode.

In at least one embodiment, the diameter of the anode electrode is 2 to 3 times the diameter of the cathode electrode.

In at least one embodiment, the anode electrode comprises a titanium layer and a platinum coating or graphite coating disposed on the titanium layer; and/or

The cathode electrode includes a titanium layer and a platinum coating disposed on the titanium layer.

In at least one embodiment, the ammonia nitrogen detection device further comprises a pump, a to-be-detected bin and a liquid outlet, the to-be-detected bin comprises an interaction port for interacting with the to-be-detected liquid outside,

the detection bin is communicated with the bin to be detected through the air-permeable membrane;

the conversion module is arranged in the to-be-tested bin, and the pump is used for controlling liquid in the to-be-tested bin and the external to-be-tested liquid to circularly change the liquid.

In at least one embodiment, the ammonia nitrogen detection device further comprises:

and the medium liquid replacing module is used for controlling the medium liquid in the detection bin to be replaced.

This application improves the basicity of waiting to detect the liquid through the mode of electrolysis, promotes the ammonium ion to turn into the ammonia, and rethread detection module detects the content of ammonia, and then calculates the content of ammonium ion in waiting to detect the liquid, and the method is simple, and the practicality is strong, the miniaturization of the check out test set of being convenient for.

The ammonia nitrogen detection device can be especially an in-situ sensor which can be placed in a water body to be detected for a long time.

Drawings

FIG. 1 shows a schematic overall structure diagram of an ammonia nitrogen detection device according to an embodiment of the application.

FIGS. 2, 3A, 3B and 3C are schematic structural diagrams of a conversion module of the ammonia nitrogen detection device according to the embodiment of the application.

FIG. 4 shows a schematic structural diagram of a detection module of the ammonia nitrogen detection device according to an embodiment of the application.

Fig. 5 shows a schematic structural diagram of a conductivity electrode of an ammonia nitrogen detection device according to an embodiment of the application.

FIG. 6 shows a schematic structural diagram of a capacitive sensor of an ammonia nitrogen detection device according to an embodiment of the application.

Fig. 7 and 8 show schematic structural diagrams of a sample changing module of the ammonia nitrogen detection device according to the embodiment of the application.

Fig. 9 shows a schematic structural diagram of an intermediary liquid replacing module of the ammonia nitrogen detecting device according to the first embodiment of the application.

Fig. 10 shows a logic diagram of the medium circulation in the medium exchange module of fig. 9.

Fig. 11 shows a schematic structural diagram of an intermediate solution replacing module of the ammonia nitrogen detecting device according to the second embodiment of the application.

Fig. 12 is a schematic structural diagram of an intermediate liquid replacing module of an ammonia nitrogen detection device according to a third embodiment of the present application.

Description of the reference numerals

1, a transformation module; 11 an anode electrode; 12 a cathode electrode;

2, a detection module; 21, detecting a bin; 22 a conductivity electrode; a 221 backplane; 222 electrode sheet; 23 a gas permeable membrane; 24 an intermediary liquid; 25 a capacitive sensor; 251 a backplane; 252 electrode pads; 253 coating;

3, a sample changing module; 31 a first diaphragm pump; 32 bins to be tested; 33, filtering the membrane; 34 a liquid outlet; 35 an air pipe; 36, draining the pump; 37 a liquid discharge port;

4 medium liquid replacing module; 41 a second diaphragm pump; 42 a medium liquid storage bin; 43 a pump mount; 44 a push rod motor; 45 connecting rods; 46 a piston; 47 a sleeve; 48 a cannula connection passage; 49 a circulation pipe; a 50 valve;

and 5, a circuit control module.

Detailed Description

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.

The application provides an ammonia nitrogen detection device, it is arranged in detecting the content of the ammonium ion in the liquid that awaits measuring. The ammonia nitrogen detection device comprises a conversion module 1 and a detection unit module 2. The conversion module 1 comprises an anode electrode 11 and a cathode electrode 12, and the anode electrode 11 and the cathode electrode 12 are used for electrolyzing liquid to be tested to generate ammonia gas. The detection module 2 comprises a detection bin 21 and a detection unit, wherein the detection bin 21 is used for storing the intermediate liquid. Wherein, it has the opening to detect storehouse 21, and the opening is provided with ventilated membrane 23, and the ammonia can get into through ventilated membrane 23 and detect storehouse 21, and the detecting element is located and detects the storehouse 21 for detect the ammonia. It will be appreciated that the gas permeable membrane 23 only allows gas to pass through, but not liquid.

Referring to fig. 1, the ammonia nitrogen detection device may further include a sample changing module 3, an intermediate liquid changing module 4, and a circuit control module 5. Next, the respective modules are described in turn.

(conversion Module 1)

Referring to fig. 1 and 2, the conversion module 1 includes an electrode pair composed of an anode electrode 11 and a cathode electrode 12, and is used for electrolyzing the liquid to be detected, so that the alkalinity of the liquid near the cathode electrode 12 is enhanced, and the conversion of ammonium ions in the liquid to be detected into ammonia gas is promoted, thereby facilitating the further detection.

The conversion module 1 may include a frame structure such as an anode electrode holder and a cathode electrode holder, which are used to fix the positions of the anode electrode 11 and the cathode electrode 12 and supply power to the anode electrode 11 and the cathode electrode 12.

The shape, size, material, relative distance, etc. of the anode electrode 11 and the cathode electrode 12 are not limited in this application.

For example, the anode electrode 11 may be cylindrical (or annular, hollow cylinder), may have a thickness (or height in the axial direction of the cylindrical shape) of 1-3mm, may have a body material of titanium, and may have a platinum coating, a graphite coating, or another inert metal coating disposed thereon. The coating can prevent the anode electrode 11 from being oxidized. Compared with the graphite coating, the platinum coating has better adhesion and is not easy to crack and fall off.

The cathode electrode 12 may be in the shape of a circular sheet (or a cylinder, which is thinner), the bulk material thereof may be titanium, and a platinum coating, a graphite coating, or other inert metal coating may be disposed on the bulk material. Preferably, the coating on the body material of the cathode electrode 12 is a platinum coating, and by utilizing the catalytic hydrogen evolution characteristic of platinum, more hydroxide radicals can be generated near the cathode electrode 12, which is more beneficial for converting ammonium ions into ammonia gas.

The diameter D of the anode electrode 11 may be larger than the diameter D of the cathode electrode 12. For example, the diameter D of the anode electrode 11 may be 2 to 3 times the diameter D of the cathode electrode 12. Preferably, D: d is 3: 1, or, D: d is 2: 1, etc. Wherein D: d is 3: 1, the electrolysis effect is better.

The cathode electrode 12 may be disposed within the anode electrode 11. The cathode electrode 12 may be parallel to the cross section of the anode electrode 11 (i.e., a radial section of the anode electrode 11). Further, the projection of the cathode electrode 12 on the end face of the anode electrode 11 is located at the center position of the end face of the anode electrode 11 in the direction perpendicular to the gas-permeable membrane 23 (vertical direction in fig. 1).

Preferably, the distance between the end face of the cathode electrode 12 close to the gas-permeable membrane 23 and the gas-permeable membrane 23 in the thickness direction of the anode electrode 11 (the vertical direction in fig. 1 and 2, the direction perpendicular to the gas-permeable membrane 23) may be not less than the distance between the end face of the anode electrode 11 close to the gas-permeable membrane 23 and the gas-permeable membrane 23 (not shown in this embodiment). That is, the end face of the cathode electrode 12 close to the gas permeable membrane 23 may be flush with or lower than the end face of the anode electrode 11 close to the gas permeable membrane 23.

Of course, as shown in fig. 1, the cathode electrode 11 may be higher than the end surface of the anode electrode 11 near the detection module 2, and the cathode electrode 12 need not be completely disposed in the anode electrode 11.

The anode electrode 11 is designed to be cylindrical and has a large diameter, so that the surface area of the anode can be increased, and a radiation electric field is formed with the cathode, so that the electrolysis efficiency is improved. The cathode electrode 12 is designed as a circular disc with a small diameter to fit the shape and size of the gas permeable membrane 23 (described later) so that the generated ammonia gas is concentrated and collected. The distance between the cathode electrode 14 and the gas permeable membrane 23 may be 1 to 5mm, preferably 3 mm.

Of course, the cross section of the anode electrode 11 may be square or other shape, with its center hollowed out; accordingly, the cathode electrode 12 may be a square sheet or other correspondingly shaped sheet.

Other embodiments of the conversion module 1 are also provided.

Referring to fig. 3A, the anode electrode 11 and the cathode electrode 12 may be square electrode sheets placed in parallel.

Referring to fig. 3B, the anode electrode 11 and the cathode electrode 12 may be vertically disposed square electrode sheets.

Referring to fig. 3C, the anode electrode 11 and the cathode electrode 12 may be circular electrode sheets disposed in parallel.

Of course, the conversion module 1 provided in the present application is not limited to the above-described embodiment.

(detection Module 2)

Referring to fig. 1 and 4, the detection module 2 may include a detection chamber 21, wherein the detection chamber 21 is provided with a detection unit (a conductivity electrode 22), the detection chamber 21 has an opening facing the conversion module 1, and a gas permeable membrane 23 is disposed on the opening. The detection chamber 21 can also contain an intermediate liquid 24.

The detection unit is used for detecting the content of ammonia, and the application does not limit the specific implementation mode of the detection unit. For example, the detection unit may be the conductivity electrode 22.

Referring to fig. 5, the conductivity electrode 22 is used for detecting the change of the conductivity of the intermediate liquid 24 in the detection chamber 21, thereby indirectly detecting the ammonia gas content. The conductivity electrode 22 may include a back plate 221 and a pair of electrode pads 222 oppositely disposed on the back plate 221. The material of the electrode tab 222 may be metal, for example, the electrode tab 222 may be a stainless steel sheet. The material of the back plate 221 may be an insulating material, such as Polyetheretherketone (PEEK). The electrode sheet 222 is disposed on the back plate 221, so that corrosion of the electrode sheet 222 can be reduced. Of course, the conductivity electrode can be a commercially available finished product, and the working principle of the conductivity electrode is not described in the present application.

The gas-permeable membrane 23 can isolate the intermediate liquid 24 in the detection chamber 21 from the liquid to be detected outside the detection chamber 21. And gases, especially ammonia (NH)₃) It is possible to pass through the gas permeable membrane 23.

Illustratively, the intermediate liquid 24 may be a boric acid solution.

Referring to fig. 4, ammonia gas generated by the conversion module 1 (especially at the cathode electrode 12) diffuses into the detection chamber 21 through the gas permeable membrane 23, undergoes a neutralization reaction with the intermediate liquid 24 to increase the conductivity of the intermediate liquid, and detects the relative change of the conductivity of the intermediate liquid 24 through the conductivity electrode 22 to obtain the content of ammonia gas. The ammonia gas content is in linear relation with the concentration of the ammonium ions in the liquid to be detected, and the concentration of the ammonium ions in the liquid to be detected can be obtained through certain mathematical operation.

The present application also provides other embodiments of the detection module 2, in particular the detection unit.

Illustratively, instead of the conductivity electrode 22, a four-probe conductivity electrode (not shown) may be fabricated using van der Waals method. Alternatively, other types of conductivity electrodes are used.

Illustratively, an inductive-type conductivity sensor (not shown in the figures) may be used in place of the conductivity electrode 22.

Illustratively, the conductivity electrode 22 may be replaced by a pH electrode (not shown), and the concentration of ammonium ions in the solution to be measured is further calculated by measuring the pH value of the intermediate solution.

In the present application, the conductivity electrode 22 is preferably used. Compared with the pH electrode, the conductivity electrode 22 has the advantages of lower cost, more stability, less possibility of being interfered by an external electromagnetic field, no need of regular calibration, higher detection speed and higher precision.

Referring to fig. 6, illustratively, a capacitive sensor 25 may be used in place of the conductivity electrode 22. The capacitive sensor 25 may include a back plate 251, an electrode pad 252, and a coating 253. The material of the back plate 251 may be an insulating material, such as Polyetheretherketone (PEEK) or the like. The electrode sheet 252 is oppositely disposed on the back plate 251, and a coating 253 is disposed on the electrode sheet 252. The electrode plate 252 may be made of metal, such as stainless steel. The material of the coating 253 may be an insulating material, such as ceramic. The concentration of ammonium ions in the solution to be measured is further calculated by measuring the change of the dielectric constant of the intermediate solution 24 between the electrode plates 252.

Of course, the detection module 2 provided in the present application is not limited to the above-described embodiment. For example, the conductivity electrode 22 may be replaced by a sensor that detects a pressure difference or a color difference.

(sample changing module 3)

Referring to fig. 1 and 7, the sample changing module 3 includes a first diaphragm pump 31, a chamber to be measured 32, a filter 33, and a liquid discharge port 34.

The first diaphragm pump 31 is used for pumping the liquid to be tested into the chamber 32 to be tested (when the test is started) or discharging the tested liquid out of the chamber 32 to be tested through the liquid outlet 34, and supplementing new liquid to be tested into the chamber 32 to be tested. Of course, the present application does not limit the specific type of pump, for example, the first diaphragm pump 31 may be replaced by a plunger pump, a vacuum pump, or the like.

The storehouse to be tested 32 is provided with an interaction port (which is also a detection port of the ammonia nitrogen detection device) interacting with the liquid to be tested, the interaction port is provided with a filter membrane 33, the filter membrane 33 can filter solid impurities in the liquid to be tested, and the first diaphragm pump 31 or the liquid discharge port 34 is prevented from being blocked after the solid impurities enter the sample changing module 3.

Referring to fig. 1, the conversion module 1 and the detection module 2 are disposed in the chamber 32 to be tested.

When the test is started, the first diaphragm pump 31 discharges the air in the chamber to be tested 32. The liquid to be tested (liquid in the test environment) is drawn into the test chamber 32 through the filter 33. After the detection is completed, the first diaphragm pump 31 works again to discharge the tested liquid out of the chamber 32 to be tested through the liquid outlet 34, and simultaneously, new liquid to be tested enters the chamber 32 to be tested, so that the purpose of changing samples is achieved. The sample changing mode is simple and easy to realize. For example, in an example using the first diaphragm pump 31, the exchange rate of the liquid to be measured can be ensured to reach 96% by controlling the operation time of the first diaphragm pump 31.

Other embodiments of the change module 3 are also provided.

Referring to fig. 8, the sample changing module 3 may include a filter 33, a chamber 32 to be measured, an air pipe 35, a drain pump 36, and a drain port 37.

After the chamber 32 to be tested is placed in the environment to be tested (water body to be tested), the air pipe 35 connects the chamber 32 to be tested with the atmosphere, the liquid to be tested enters the chamber 32 to be tested through the filter membrane 33 under the action of pressure, and the air in the chamber 32 to be tested is discharged through the air pipe 35. After the test is completed, the drain pump 36 is turned on to drain the liquid in the chamber 32 to be tested through the drain port 37.

The drainage rate of the drainage pump 36 can be greater than the rate of the liquid to be measured entering the chamber 32 to be measured, so that the air enters the chamber 32 to be measured from the air pipe 35, the liquid discharge efficiency is improved by means of air pressure, and the effect of discharging all the liquid is achieved. After the drainage pump 36 is closed, new liquid to be measured enters the chamber 32 to be measured again under the action of pressure, and air is discharged, so that the purpose of changing samples is achieved.

The drain pump 36 here can be, for example, a submersible pump.

Of course, the sample changing module 3 provided in the present application is not limited to the above-described embodiment.

(Medium liquid replacement module 4)

Referring to fig. 1 and 9, in the first embodiment of the present application, the intermediate liquid replacement module 4 may include a second diaphragm pump 41, an intermediate liquid storage tank 42, and a pump mount 43.

The intermediate liquid storage tank 42 is used for storing the intermediate liquid 24. The pump base 43 has a passage therein, and a mixing chamber (not shown) is enclosed in the pump base 43 or the pump base 43 and the housing of the ammonia nitrogen device.

Referring to fig. 10, the detection chamber 21 communicates with the intermediate liquid storage chamber 42 through a passage (arrow indicates line in fig. 10, the same applies hereinafter) in the pump mount 43; the medium liquid storage bin 42 is communicated with the mixing chamber; the mixing chamber communicates with the second diaphragm pump 41 via a passage in the pump mount 43; the second diaphragm pump 41 is connected to the inspection chamber 21 through a passage and a pipe in the pump mount 43. Preferably, the pipeline communicating with the detection chamber 21 can be extended into the small chamber as much as possible, but the detection effect of the detection module is not required to be affected.

The second diaphragm pump 41 can drive the intermediary liquid 24 to circulate among the detection chamber 21, the intermediary liquid storage chamber 42 and the mixing chamber so as to replace the intermediary liquid 24 in the detection chamber 21.

As it is used, the conductivity or pH of the intermediate liquid 24 in the intermediate liquid storage tank 42 gradually increases, and the intermediate liquid 24 needs to be replaced to some extent. The conductivity or pH value of the intermediate liquid 24 can be calculated from the measured original data of the liquid to be measured, an early warning system can be arranged in the intermediate liquid storage bin 42, and when the parameter of the intermediate liquid 24 reaches a critical value which is not recommended to be used continuously, a signal can be sent by the circuit control module 5 to prompt a user to replace the intermediate liquid storage bin 42, further replace the intermediate liquid 24 or replace the intermediate liquid 24 in the intermediate liquid storage bin 42. The intermediate liquid storage tank 42 may be provided with a replenishment port through which the intermediate liquid 24 is replenished. The refill port may be provided with a sealing plug. Preferably, the sealing plug can be replaced by a breathable film, or a through hole can be formed in the sealing plug, and the breathable film is arranged on the through hole, so that the sealing effect can be achieved, the intermediary liquid 24 is prevented from overflowing, and air bubbles in the intermediary liquid storage bin 42 can be discharged in time.

Illustratively, the second diaphragm pump 41 may be replaced with a plunger pump, a vacuum pump, or the like. The medium liquid storage tank 42 may be designed in plurality.

Other embodiments of the mediating liquid exchange module 4 are also provided.

For example, referring to fig. 11, in a second embodiment of the present application, the medium replacement module 4 may include a push rod motor 44, a connecting rod 45, a piston 46, a sleeve 47, a sleeve connection channel 48, and a medium storage tank 42.

The intermediate liquid storage tank 42 is used for storing the intermediate liquid 24. The rod motor 44 can drive a connecting rod 45, a piston 46 fixedly connected with the connecting rod, and a sleeve 47 to reciprocate. The diameter of the piston 46 may be comparable to the inner diameter of the sleeve 47. The medium liquid in the detection chamber 21 and the medium liquid storage chamber 42 can be interacted by the reciprocating motion of the piston 46 in the sleeve 47.

The cannula 47 can communicate with the test cartridge 21 through a cannula connection passage 48. In addition, the detection chamber 21 communicates with the intermediate liquid storage chamber 42.

When the piston 46 moves away from the detection chamber 21 (upward), the medium liquid 24 enters the detection chamber 21 from the medium liquid storage chamber 42 due to the negative pressure, and the medium liquid 24 in the detection chamber 21 is sucked into the sleeve 47.

When piston 46 moves closer to test chamber 21 (downward), medium liquid 24 in sleeve 47 is again fed into test chamber 21 and mixed with new medium liquid 24 in test chamber 21.

Exemplarily, referring to fig. 12, in the third embodiment of the present application, the medium replacement module 4 includes a second diaphragm pump 41, a circulation pipe 49, and a valve 50. The inlet and outlet of the second diaphragm pump 41 are connected to the circulation pipe 49, and the detection unit (for example, the conductivity electrode 22) is disposed in the circulation pipe 49, the intermediary liquid 24 can be driven by the second diaphragm pump 41 to circularly flow, so that the intermediary liquid 24 in the detection chamber 21 (the space formed by the valve 50 and the circulation pipe 49) can be replaced.

The present application is not limited to the type of pump, and may also be, for example, a plunger pump, a vacuum pump, or the like. Of course, the flow of the intermediate fluid may be driven by other means, such as by electromagnetic force.

The present application does not limit the specific shape of the circulation duct 49, and for example, various shapes of the meander may be designed. The material of the circulation duct 49 may be a flexible material such as polyvinyl chloride, polyethylene, or the like. An opening is provided in the circulation pipe 49, and a gas permeable membrane 23 is provided at the opening, and the liquid is isolated and the ammonia gas can enter the circulation pipe 49 through the opening.

The valve 50 may be configured to be opened and closed by a solenoid valve, for example. The valves 50 may be provided in two stages, and the detection unit is provided between the two stages of valves 50, and the gas permeable membrane 23 is also provided between the two stages of valves 50. The valve can also be arranged into a door by the memory alloy material, and the opening and the closing of the door made of the memory alloy material are realized by the control of set conditions.

The pipe wall of the circulating pipeline 49 can be used as the side wall of the detection bin 21, when the valve 50 is closed, the detection bin 21 does not perform medium liquid circulation any more, and the detection unit plays a detection role; after the valve 50 is opened, the intermediate liquid 24 is circulated under the driving of the second diaphragm pump 41, which is equivalent to diluting the intermediate liquid 24 reacted with ammonia gas, so that the ammonia nitrogen sensor is more durable. The circulation line 24 may be provided with a replacement port through which the intermediate liquid 24 in the circulation line 49 may be replaced after a period of use.

The detection module 2 and the circulating pipeline 49 can be designed to be matched in a plugging manner by utilizing the idea of modular design, so that the detection module 2 can be connected into the circulating pipeline 49 (not shown in the figure).

The two side walls of the detection chamber 21 are configured to be capable of controlling opening and closing (the side walls capable of controlling opening and closing are equivalent to valves), and the detection chamber 21 has a chamber body actually existing at this time.

Valves may be provided only in the detection module 2 (particularly the detection chamber 21), or valves may be provided in both the circulation pipe 49 and the detection module 2. The specific arrangement of the valves is not limited in this application, and the detection chamber 21 can be arranged between the valves, and the medium liquid 24 can stop the circulation.

Accordingly, the detection module 2 (particularly the detection chamber 21) is provided with an opening, and a gas permeable membrane 23 is arranged at the opening. The detection unit is connected to the circulation pipe 49.

Illustratively, the intermediate liquid 24 can also be directly discharged from the ammonia nitrogen detection device, and the intermediate liquid 24 is not circulated. The test chamber 21 can be supplied with entirely new mediating liquid 24 from the mediating-liquid reservoir 42.

Of course, the mediating liquid replacing module 4 provided in the present application is not limited to the above-described embodiment. Ordinal numbers (first, second, and third) before the embodiments are used to better distinguish the embodiments, and do not limit the number and the combination possibility of the embodiments.

(Circuit control Module 5)

The circuit control module 5 may include logic circuits and a power supply. The logic circuit is responsible for controlling the working logic of the first diaphragm pump 31, the second diaphragm pump 32, the conductivity electrode 22, the anode electrode 11 and the cathode electrode 12, and the power supply is responsible for providing the electric power required by the operation of the electrolytic ammonia nitrogen detector.

The circuit control module 5 may further include a display module for displaying the detected data. The circuit control module 5 may further include: and the output module is used for outputting the detected data to the display terminal.

The ammonia nitrogen detection device has the working logic that:

first, the sample changing module 3 operates to change or add (at the time of first detection) the liquid to be detected in the chamber 32 to be detected. Subsequently, the conversion module 1 works to convert ammonium ions in the solution to be detected into ammonia gas, and the ammonia gas diffuses into the detection bin 21 and reacts with the intermediate solution 24. Meanwhile, the detection module 2 works to detect the conductivity change or other parameters of the intermediate liquid 24 in the detection bin 21 and calculate the content of ammonium ions in the liquid to be detected. After the detection is finished, the intermediate liquid replacing module 4 works to update the intermediate liquid 24 in the detection bin 21, and the sample replacing module 3 works to replace the liquid to be detected in the bin 32 to be detected in time so as to carry out the next detection.

The application provides an ammonia nitrogen detection device can improve the basicity of waiting to detect the liquid through the mode of electrolysis waiting to detect the liquid, is convenient for produce the ammonia, does benefit to subsequent detection. The alkaline material storage tank does not need a space for containing alkaline materials, and is beneficial to miniaturization of equipment; the online monitoring can be carried out for a long time, and the maintenance cost is low; and alkaline substances are not added into the liquid to be detected, so that the method is environment-friendly.

While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an ammonia nitrogen detection device which characterized in that includes:

the conversion module comprises an anode electrode and a cathode electrode, and the anode electrode and the cathode electrode are used for electrolyzing the liquid to be detected to generate ammonia gas;

2. The ammonia nitrogen detection device according to claim 1, wherein the detection unit is one of a conductivity electrode, an inductive conductivity sensor, a pH electrode, and a capacitance sensor.

3. The ammonia nitrogen detection device of claim 1, wherein the anode electrode is cylindrical and the cathode electrode is in the shape of a circular disc.

4. The ammonia nitrogen detection device of claim 3, wherein the cathode electrode is parallel to the cross section of the anode electrode.

5. Ammonia nitrogen detection device according to claim 3 or 4, wherein the diameter of the anode electrode is larger than the diameter of the cathode electrode, and the cathode electrode is arranged in the anode electrode.

6. The ammonia nitrogen detection device according to claim 5, wherein the distance between the end face of the cathode electrode close to the gas permeable membrane and the gas permeable membrane is not less than the distance between the end face of the anode electrode close to the gas permeable membrane and the gas permeable membrane, and the projection of the cathode electrode on the end face of the anode electrode is located at the center of the end face of the anode electrode, along the direction perpendicular to the gas permeable membrane.

7. The ammonia nitrogen detection device of claim 5, wherein the diameter of the anode electrode is 2 to 3 times the diameter of the cathode electrode.

8. Ammonia nitrogen detection device according to any one of claims 1 to 4,

the anode electrode comprises a titanium layer and a platinum coating or a graphite coating arranged on the titanium layer; and/or

The cathode electrode comprises a titanium layer and a platinum coating arranged on the titanium layer.

9. An ammonia nitrogen detection device according to any one of claims 1 to 4, characterized in that the ammonia nitrogen detection device further comprises a pump, a chamber to be detected and a liquid outlet, the chamber to be detected comprises an interaction port for interacting with the liquid to be detected outside,

the detection bin is communicated with the bin to be detected through the air-permeable film;

the conversion module is arranged in the to-be-tested bin, and the pump is used for controlling the liquid in the to-be-tested bin and the external to-be-tested liquid to circularly change the liquid.

10. Ammonia nitrogen detection apparatus according to any one of claims 1 to 4, characterized in that the apparatus further comprises: