CN214539371U - Ammonia gas sensor - Google Patents

Abstract

The utility model relates to a sensor, more specifically say, relate to an ammonia sensor, including the layered casing, be provided with the reservoir in the layered casing, be provided with the battery body in the reservoir, electrolyte and be used for the storage of storage electrolyte cotton, the battery body sets up in electrolyte, the cotton top of storage, and the top of layered casing is provided with the backward flow mouth, is provided with backflow channel in the layered casing, backflow channel's one end and reservoir intercommunication, backflow channel's the other end and backward flow mouth intercommunication, the utility model discloses a backward flow mouth on the layered casing, backflow channel can prevent that the electrolyte in the sensor from oozing outward, and the utility model discloses can accurate ammonia gas content in the real-time on-line measuring environment reliably, have and detect the precision height, anti-interference, long-life is suitable for outstanding advantages such as extremely low concentration detection.

Description

Ammonia gas sensor

Technical Field

The utility model relates to a sensor, more specifically say, relate to an ammonia sensor.

Background

Ammonia is a common industrial raw material, and in addition, urea in excrement is decomposed by microorganisms in places such as farms, toilets and the like to generate ammonia. The ammonia gas in the industrial place is characterized by high concentration and single gas type, and only leakage occurs, and the leakage occurs in normal monitoring; places such as farms, toilets, and the likeThe ammonia gas is characterized in that the gas exists all the time and has extremely low concentration, and the concentration of the ammonia gas in the toilet is less than 0.3mg/m in the toilet as specified by the national standard by taking the toilet as an example³。

Ammonia gas is mainly inhaled and poisoned through respiratory tract. The toxicity of ammonia to humans is related to the concentration of ammonia in the environment and the contact time. The low concentration ammonia has stimulation effect on mucous membrane, and the high concentration ammonia can cause tissue soluble necrosis (i.e. saponification) such as tissue protein denaturation and fatty tissue saponification, and cause skin and upper respiratory tract mucous membrane chemical inflammation, burn, pulmonary congestion, pulmonary edema and hemorrhage; ammonia sucked into alveolus via respiratory tract is mostly absorbed into blood, so that the blood ammonia concentration is increased, the central nervous system is damaged, and the central nervous system is excited and then paralyzed; ammonia can also cause hepatic steatosis, renal interstitial inflammation and myocardial damage, affecting the normal function of the organism. Therefore, the ammonia gas with high concentration or low concentration needs to be accurately detected, and the health driving is protected.

The ammonia gas is difficult to naturally generate chemical reaction at normal temperature due to the particularity of molecules, and the detection of the ammonia gas is mainly carried out by adopting a fixed potential electrolysis method at present. The sensor of the principle needs to apply excitation voltage to the outside to realize detection when working, the background noise of the sensor is extremely large due to the introduction of the excitation voltage, the sensor is not suitable for low-concentration detection, and in addition, the service life of the sensor is generally short due to the fact that the sensor works in an excitation state. The current commercially available ammonia gas sensor is based on the constant potential electrolysis type principle for detection, the resolution of the sensor is optimal at 2ppm, and the detection error is at least 6 ppm; the life of the sensor is below 2 years, and the decay rate of the sensor is 2% per month. The sensor is applicable to monitoring in the industrial field without problems because the industry has requirements of regular calibration every 6 months, and in addition, the gas concentration is higher in the industry, and the resolution of the sensor can meet the requirements. However, in an environment of extremely low concentration such as a farm and a toilet, the above sensor is apparently not sufficient. And electrolyte in the sensor easily leaks outward and leads to the electrolyte in the sensor not enough to make the detection of sensor inaccurate or break down, change the sensor again can lead to the improvement of cost, and be unfavorable for the environmental protection.

SUMMERY OF THE UTILITY MODEL

The utility model provides an ammonia sensor for overcoming the defects and deficiencies of the prior art.

In order to achieve the purpose, the utility model discloses the technical scheme who takes is an ammonia sensor, including layered casing, be provided with the reservoir in the layered casing, be provided with battery body, electrolyte and be used for the storage cotton of storage electrolyte in the reservoir, the battery body set up in the cotton top of electrolyte, storage, the top of layered casing is provided with the backward flow mouth, be provided with backflow channel in the layered casing, backflow channel's one end with the reservoir intercommunication, backflow channel's the other end with backward flow mouth intercommunication.

The layered shell comprises a first shell, a second shell and a third shell which are sequentially stacked and connected, wherein a first through hole is formed in the middle of the first shell, a backflow port is formed in the first shell, a second through hole is formed in the middle of the second shell, a backflow channel is formed in the second shell, a liquid storage tank is arranged in the middle of the third shell, and the first through hole, the second through hole and the liquid storage tank are connected to form the liquid storage tank.

And a waterproof breathable film is arranged on the first shell.

The battery body comprises a semi-solid electrolyte layer, an anode electrode and a cathode electrode, wherein the anode electrode and the cathode electrode are respectively arranged on two sides of the semi-solid electrolyte layer, an anode conductive column is arranged on the anode electrode, and a cathode conductive column is arranged on the cathode electrode.

An outer conductive column is arranged on the layered shell, and the anode conductive column and the cathode conductive column are respectively connected with the outer conductive column.

The semi-solid electrolyte layer comprises a porous support layer for absorbing and storing electrolyte, and the porous support layer is one of a porous ceramic plate, a porous polytetrafluoroethylene plate, a porous e-PTFE plate and porous cotton.

And catalyst layers are arranged on the anode electrode and the cathode electrode.

The layered shell is made of one of ABS, PC and PE.

The utility model has the advantages that:

the utility model provides an ammonia sensor can prevent the electrolyte exosmosis in the sensor through backward flow mouth, backward flow passageway on the layer-stepping casing, and the utility model discloses can be accurate ammonia gas content in the real-time on-line measuring environment reliably, it is high to have the detection precision, and is anti-interference, and long-life is suitable for outstanding advantages such as extremely low concentration detection.

Drawings

Fig. 1 is an exploded view of an ammonia gas sensor according to the present invention;

fig. 2 is an exploded view of the battery body of the ammonia gas sensor of the present invention.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and only schematically illustrate the basic structure of the invention, and the direction of the present embodiment is based on the direction of fig. 1.

As shown in fig. 1, an ammonia gas sensor comprises a layered casing 1, a liquid storage tank 2 is arranged in the layered casing 1, a battery body 3, an electrolyte and storage cotton used for storing the electrolyte are arranged in the liquid storage tank 2, the battery body 3 is arranged above the electrolyte and the storage cotton, a backflow port 4 is arranged above the layered casing 1, a backflow channel 5 is arranged in the layered casing 1, one end of the backflow channel 5 is communicated with the liquid storage tank 2, and the other end of the backflow channel 5 is communicated with the backflow port 4. The sensor adopts the fuel cell principle to detect, and because ammonia belongs to alkaline gas and hydroxide ions are generated by reaction, an electrolyte needs to be an electrolyte with hydroxide ion conduction capability, and the acid electrolyte and the solid electrolyte used in the common gas sensor cannot realize the conduction of the hydroxide ions. The utility model discloses well electrolyte adopts the ionic liquid who has hydroxyl ion conduction ability. The electrolyte may be an ionic liquid with borate, sulfonate, carbonate, etc.

The layered shell 1 comprises a first shell 11, a second shell 12 and a third shell 13 which are sequentially stacked and connected, a first through hole 21 is formed in the middle of the first shell 11, a backflow port 4 is formed in the first shell 11, a second through hole 22 is formed in the middle of the second shell 12, a backflow channel 5 is formed in the second shell 12, a liquid storage tank 23 is formed in the middle of the third shell 13, and the first through hole 21, the second through hole 22 and the liquid storage tank 23 are connected to form a liquid storage tank 2.

The first housing 11, the second housing 12, and the third housing 13 may be bonded together by electronic glue, heat fusion, or the like. When the volume of the electrolyte expands due to the rise of the ambient temperature and overflows out of the storage cotton, the overflowed electrolyte can enter the return channel 5 from the return port 4 and then return to the liquid storage tank 2. The return passage 5 may be provided in the second casing 12 or the third casing 13, and only the return port 4 and the reservoir tank 2 need to be communicated with each other. The layered shell 1 can be at least arranged in two layers, a first through hole 21 is formed in the first shell 11, a liquid storage tank 23 is arranged on the second shell 12, the liquid storage tank 23 is communicated with the first through hole 21 to form a liquid storage tank 2, the backflow port 4 is arranged on the first shell 11, and the backflow channel 5 can be arranged in the second shell 12.

The first shell 11 is provided with a waterproof breathable film 6. The waterproof breathable film 6 is a gas diffusion film made of polytetrafluoroethylene, polyfluoroethylene, polytetrafluoroethylene-hexafluoropropylene copolymer, polytetrafluoroethylene-perfluoropropylvinylether copolymer, polyethylene-tetrafluoroethylene copolymer, polyimide, silicone rubber or fluorinated silicone rubber, has excellent waterproof performance, and can allow gas molecules to freely enter and exit the shell 11 of the sensor without water, dust and the like passing through.

As shown in fig. 2, the battery body 3 includes a semi-solid electrolyte layer 31, an anode electrode 32, and a cathode electrode 33, wherein the anode electrode 32 and the cathode electrode 33 are respectively disposed on two sides of the semi-solid electrolyte layer 31, the anode electrode 32 is provided with an anode conductive pillar 34, and the cathode electrode 33 is provided with a cathode conductive pillar 35.

The anode electrode 32 and the cathode electrode 33 are respectively communicated with the anode conductive column 34 and the cathode conductive column 35.

The layered casing 1 is provided with an outer conductive column 7, and the anode conductive column 34 and the cathode conductive column 35 are respectively connected with the outer conductive column 7.

The semi-solid electrolyte layer 31 includes a porous support layer for absorbing and storing an electrolyte, and the porous support layer is one of a porous ceramic plate, a porous polytetrafluoroethylene plate, a porous e-PTFE plate, and porous cotton.

The anode electrode 32 and the cathode electrode 33 are each provided with a catalyst layer. The catalyst layer is made of metal or metal mixture of metal such as gold, rhodium, platinum, ruthenium, palladium, iridium or silver, or metal mixture supported on conductive carbon particles, that is, metal or metal mixture is supported on conductive carbon particles, wherein the conductive carbon particles can be one or combination of carbon black, carbon nanotubes or active carbon, and preferably metal or metal mixture supported on conductive carbon particles is adopted.

The layered shell 1 is made of one of ABS, PC and PE.

The function of the layered casing 1 includes: firstly, providing structural support protection for the internal battery body 3; secondly, constructing an anode gas chamber and a cathode gas chamber (not marked in the figure) for the chemical reaction of ammonia gas and oxygen gas; thirdly, providing a connecting position for the outer conductive column 7; fourthly, an installation position is provided for the waterproof breathable film 6; a liquid storage tank 2 for providing electrolyte; and sixthly, a backflow port 4 and a backflow channel 5 are provided for the electrolyte.

The utility model discloses a structure has following several and is showing characteristics: firstly, a liquid storage tank 2, a backflow port 4 and a backflow channel 5 are designed to solve the problem of expansion and overflow of electrolyte; secondly, the cathode and anode conductive posts are made of the same material as the cathode and anode electrodes and are connected with the outer conductive post 7 on the layered shell 1 for electronic conduction, so that the connection mode of platinum wires and other conducting wires in the prior art is avoided, and the layered shell is safe and reliable, large in contact area, low in cost and simple and convenient to operate.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An ammonia gas sensor, characterized in that: including layer-stepping casing (1), be provided with reservoir (2) in layer-stepping casing (1), be provided with battery body (3), electrolyte and be used for the storage cotton of storage electrolyte in reservoir (2), battery body (3) set up in the top of electrolyte, storage cotton, the top of layer-stepping casing (1) is provided with backward flow mouth (4), be provided with backflow channel (5) in layer-stepping casing (1), the one end of backflow channel (5) with reservoir (2) intercommunication, the other end of backflow channel (5) with backward flow mouth (4) intercommunication.

2. The ammonia gas sensor of claim 1, wherein: layered casing (1) is including stacking first casing (11), second casing (12), third casing (13) of connecting in proper order, be provided with first through-hole (21) in the middle of first casing (11), backward flow mouth (4) set up in on first casing (11), be provided with second through-hole (22) in the middle of second casing (12), backward flow passageway (5) set up in second casing (12), be provided with liquid storage tank (23) in the middle of third casing (13), first through-hole (21), second through-hole (22), liquid storage tank (23) are connected and are formed reservoir (2).

3. An ammonia gas sensor as defined in claim 2 wherein: and a waterproof breathable film (6) is arranged on the first shell (11).

4. An ammonia gas sensor as defined in claim 3 wherein: the battery body (3) comprises a semisolid electrolyte layer (31), an anode electrode (32) and a cathode electrode (33), wherein the anode electrode (32) and the cathode electrode (33) are respectively arranged on two sides of the semisolid electrolyte layer (31), an anode conductive column (34) is arranged on the anode electrode (32), and a cathode conductive column (35) is arranged on the cathode electrode (33).

5. An ammonia gas sensor as defined in claim 4 wherein: an outer conductive column (7) is arranged on the layered shell (1), and the anode conductive column (34) and the cathode conductive column (35) are respectively connected with the outer conductive column (7).

6. An ammonia gas sensor as defined in claim 5 wherein: the semi-solid electrolyte layer (31) comprises a porous support layer for absorbing and storing electrolyte, wherein the porous support layer is one of a porous ceramic plate, a porous polytetrafluoroethylene plate, a porous e-PTFE plate and porous cotton.

7. An ammonia gas sensor as defined in claim 6 wherein: catalyst layers are arranged on the anode electrode (32) and the cathode electrode (33).

8. An ammonia gas sensor as defined in claim 7 wherein: the layered shell (1) is made of one of ABS, PC and PE.

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