CN108318567A - A kind of formaldehyde gas sensor - Google Patents
A kind of formaldehyde gas sensor Download PDFInfo
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- CN108318567A CN108318567A CN201810348495.5A CN201810348495A CN108318567A CN 108318567 A CN108318567 A CN 108318567A CN 201810348495 A CN201810348495 A CN 201810348495A CN 108318567 A CN108318567 A CN 108318567A
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- formaldehyde gas
- shell
- gas sensor
- conductive filament
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4162—Systems investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid
Abstract
The present invention relates to a kind of formaldehyde gas sensors, shell including sealing, the cell body for detecting formaldehyde gas, conductive filament pinboard and waterproof ventilated membrane, cathode conductive filament and anode conducting silk on the cell body and the cell body are sealingly mounted in the shell, the cathode conductive filament and anode conducting silk are electrically connected by conductive filament pinboard with pcb board, the conductive filament pinboard is fixedly mounted on the outer wall of the shell, through hole is offered on the shell, the waterproof ventilated membrane is mounted at the through hole.The present invention formaldehyde gas sensor can accurately and reliably real-time online detection environment in content of formaldehyde gas, have shock resistance it is good, not by outside electromagnetic interference, detection sensitivity is high outstanding advantages of.
Description
Technical field
The present invention relates to the technical fields of formaldehyde gas detection, and fuel cell principle is based on more specifically to one kind
Formaldehyde gas sensor.
Background technology
Formaldehyde is widely used in its excellent dissolubility in various construction materials as a kind of important chemical substance,
Such as artificial board, textile, coating, adhesive, but formaldehyde is a kind of gas that is colourless, having intense irritation smell, it is right
Human eye, nose etc. have stimulation, the main harm of formaldehyde to show as to mucocutaneous stimulation, and formaldehyde reaches one indoors
When determining concentration, people just has sense of discomfort, is more than 0.08mg/m3Concentration of formaldehyde can cause to be envious, eye is itched, throat discomfort or pain,
Hoarseness, sneeze, uncomfortable in chest, asthma, dermatitis etc..Newly-decorated room content of formaldehyde is higher, is the main inducing of numerous diseases.
Formaldehyde mainly has the following aspects to health hazard：
A, stimulation：The main harm of formaldehyde shows as the stimulation to skin and mucosa, and formaldehyde is magma noxious material,
It can be combined with protein, the serious stimulation of respiratory tract and oedema, Eye irritation, headache occurs in high concentration when sucking；
B, sensitization：Direct skin contact formaldehyde can cause allergic dermatitis, color spot, necrosis, suck high-concentration formaldehyde
When can induce bronchial asthma；
C, mutagenesis：High-concentration formaldehyde or a kind of genotoxicity substance, experimental animal inhale in laboratory high concentration
In the case of entering, rhinopharyngeal neoplasm can be caused；
D, outstanding behaviours：Headache dizzy, weak, Nausea and vomiting, uncomfortable in chest, ophthalmodynia, is had a throat-ache, stomach is received poor, palpitaition, mistake
Dormancy, weight loss, failure of memory and vegetative nervous disorder etc.；Pregnant woman's sucking for a long time may lead to fetal anomaly, or even dead
It dies, sucking can lead to man's teratospermia, death etc. to man for a long time.
When concentration of formaldehyde reaches 0.06-0.07mg in every cubic metres of air, children will occur slightly to pant；Work as room
Interior formaldehyde in air reaches 0.1mg/m3When, just there are peculiar smell and sense of discomfort；Formaldehyde reaches 0.5mg/m3When, eyes can be stimulated, are caused
It sheds tears；Formaldehyde reaches 0.6mg/m3, throat discomfort or pain can be caused；When concentration higher, nausea and vomiting can be caused, chest of coughing
It is bored, asthma even pulmonary edema；Formaldehyde reaches 30mg/m3When, understand causing death immediately.
Specialty analysis shows room air pollution hundreds times more serious than outdoor air pollution, especially the tightest with formaldehyde pollution
Weight, the accurate content of formaldehyde gas measured in air have a very important significance.Common Analysis Methods for Formaldehyde includes light splitting
Photometry, chromatography and sensor method.Spectrophotometry and chromatography are all offline formaldehyde analytical plans, need Large-scale professional
Equipment and interminable operation and flow are not suitable for daily real time on-line monitoring and use.It can accurately be examined with real-time online at present
Survey content of formaldehyde gas is feulcell prototype formaldehyde gas sensor, has many advantages, such as that response is rapid, easy to operate.But it is existing
The formaldehyde gas sensor deposited is had the following disadvantages due to the defect in terms of structure design：
1, sensor has partially electronically conductive silk exposed, to cause sensor shock resistance poor, easily by the extraneous electricity such as WiFi module
Magnetic disturbance；
2, sensor bulk is larger, installs and uses inconvenience；
3, sensor internal anode and cathode chamber volume mismatches, and sensitivity is low, and stability is poor；
4, sensor is susceptible to the phenomenon that concentration leaps high and bears drift.
It can be seen that in existing formaldehyde examination technology, spectrophotometry and chromatography, cannot due to being off-line analysis mode
Real-time online detects the content of formaldehyde gas in environment；Existing formaldehyde gas sensor is due to design defect, and there are shock resistances
Difference, the electromagnetic interference of WiFi module etc. easily in by external environment, poor sensitivity, stability is poor, and there are concentration to leap high the showing of negative drift
As the deficiencies of, to which content of formaldehyde gas in environment cannot be detected well.
Invention content
The purpose of the present invention is to provide a kind of formaldehyde gas sensors, solve formaldehyde gas sensing in the prior art
Easily led to that the formaldehyde gas in environment cannot be detected well by outside electromagnetic interference, poor sensitivity, stability difference existing for device
The problem of content.
The technical proposal for solving the technical problem of the invention is：A kind of formaldehyde gas sensor, including sealing are outer
Shell, the cell body for detecting formaldehyde gas, conductive filament pinboard and waterproof ventilated membrane, the cell body and the cell body
On cathode conductive filament and anode conducting silk be sealingly mounted in the shell, the cathode conductive filament and anode conducting silk are logical
It crosses conductive filament pinboard to be electrically connected with pcb board, the conductive filament pinboard is fixedly mounted on the outer wall of the shell, described outer
Through hole is offered on shell, the waterproof ventilated membrane is mounted at the through hole.
In the formaldehyde gas sensor of the present invention, is protruded out on the outer wall of the shell and be formed with welding column, the welding
Column is integrally formed with the shell, and the conductive filament pinboard has welding port and two welderings for being fixed on pcb board
Disk terminal, the welding port are fixedly connected with the welding column by way of hot melt.
In the formaldehyde gas sensor of the present invention, the shell includes upper shell and lower housing, and the upper shell is under
Sealing welding is realized between shell by way of ultrasonic bonding.
In the formaldehyde gas sensor of the present invention, the upper shell, lower housing and welding column are by ABS, PC or PE system
At；The waterproof ventilated membrane is by polytetrafluoroethylene (PTFE), gathered vinyl fluoride, polytetrafluoroethylene (PTFE)-hexafluoropropylene copolymer, polytetrafluoro
The third vinyl ether copolymers of ethylene-perfluor, polyethylene-TFE copolymer, polyimides, silicon rubber or silicon fluoride rubber are made
Gas diffusion membrane.
In the formaldehyde gas sensor of the present invention, the cell body includes semisolid electrolyte layer and is arranged described
The anode electrode and cathode electrode of semisolid electrolyte layer both sides, the anode electrode and the cathode electrode pass through described respectively
Anode conducting silk and cathode conductive filament carry out electric signal transmission；The semisolid electrolyte layer includes porous substrate and liquid electrolytic
Matter, the liquid electrolyte are placed in the hole of the porous substrate.
In the formaldehyde gas sensor of the present invention, the aperture of the hole of the porous substrate and the liquid electrolytic put
The molecular size of matter is identical.
In the formaldehyde gas sensor of the present invention, the molecular structure of the porous substrate and the molecule of liquid electrolyte it
Between have matching and form intermolecular force.
The present invention formaldehyde gas sensor in, the porous substrate be porous ceramic plate, porous polytetrafluoroethylene sheet,
Plate-like substrate made of porous PVC plate or porous e-PTFE plates；The liquid electrolyte includes in sulfuric acid, phosphoric acid, benzene sulfonic acid
Either the liquid electrolyte includes at least one of sodium chloride, potassium acetate or the liquid electrolyte packet at least one
Include at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide.
In the formaldehyde gas sensor of the present invention, the active constituent of the catalyst on the anode electrode and cathode electrode
Including at least one of gold, rhodium (Rh), platinum (Pt), ruthenium (Ru), palladium (Pd), iridium (Ir), silver-colored (Ag).
In the formaldehyde gas sensor of the present invention, the active constituent of the catalyst on the anode electrode and cathode electrode
It supports on conductive carbon particle, the conductive carbon particle includes at least one of carbon black, carbon nanotube, activated carbon.
The formaldehyde gas sensor for implementing the present invention, has the advantages that：The formaldehyde gas sensor of the present invention can
With accurately and reliably real-time online detect environment in content of formaldehyde gas, have shock resistance it is good, not by outside electromagnetic interference, inspection
Outstanding advantages of surveying high sensitivity.
Description of the drawings
Fig. 1 is the structural schematic diagram of the formaldehyde gas sensor of the present invention；
Fig. 2 is the structural schematic diagram of the semisolid electrolyte layer in the formaldehyde gas sensor of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the structurally and functionally principle of the formaldehyde gas sensor of the present invention is made further
Explanation：
As shown in Figure 1, the present invention relates to a kind of formaldehyde gas sensor, which includes the shell of sealing
11, the cell body 12, conductive filament pinboard 13 and waterproof ventilated membrane 14 for detecting formaldehyde gas, cell body 12 and cell body
Anode conducting silk 124 and cathode conductive filament 125 on 12 are sealingly mounted in shell 11, and cathode conductive filament 125 and anode are led
Electrical filament 124 is electrically connected by conductive filament pinboard 13 with pcb board, and conductive filament pinboard 13 is fixedly mounted on the outer wall of shell 11
On, through hole is offered on shell 11, waterproof ventilated membrane 14 is mounted at through hole.
Shell 11 includes upper shell 111 and lower housing 112, passes through ultrasonic bonding between upper shell 111 and lower housing 112
Mode realize sealing welding.ABS, PC, PE etc., which may be used, in upper shell 111 and lower housing 112 respectively has some strength simultaneously
And corrosion-resistant material is made.The effect of shell 11 includes：One, is provided by the support in structure and is protected for internal cell body 12 and made
With；Two, the anode and cathode air chamber (not indicated in figure) that formaldehyde and oxygen chemically react are built；Three, it is that conductive filament is transferred
Plate 13 provides safe and reliable installation fixing position；Four, it is that waterproof ventilated membrane 14 provides installation position.
It is protruded out on the outer wall of shell 11 and is formed with welding column 113, welding column 113 is integrally formed with shell 11, and conductive filament turns
Fishplate bar 13 has welding port 131 and two pad terminals 132 for being fixed on pcb board, welding port 131 and welding column
113 are fixedly connected by way of hot melt.Specifically, conducting Pt wire pinboard 13 uses c-type structure, passes through two thinner welderings
Disk terminal 132 is fixed on pcb board, simple secured.It is connected with the welding column 113 on upper shell 111 by welding port 131
It connects, conductive filament pinboard 13 is securely fixed on upper shell 111 by way of hot melt.Welding column on upper shell 111
113 avoid sensor in the prior art with the design of 111 integralization of upper shell of shell 11 with stronger supporting role
Occurs the shake of welding column during ultrasonic bonding caused by a manner of due to carrying out welding by thinner self-existent welding column
Disconnected phenomenon, to increase the shock resistance of sensor.Welding column 113 uses same material with shell 11, such as ABS, PC, PE
Deng, be it is one-time formed in 11 injection moulding process of shell, only fixed conductive filament pinboard can be played by way of hot melt
13 effect avoids in the sensor of the prior art using catalyst poisoning and sensor caused by the fixed mode of glue
The higher phenomenon of zero.In addition cathode after upper shell 111 is merged with lower housing 112 by way of ultrasonic bonding
Conductive filament 125 and anode conducting silk 124 are completely wrapped in the shell 11 of sensor, outside without exposed part, to
It avoids in the sensor of the prior art due to there is partially electronically conductive silk exposed outside to be susceptible to mistake in operation
Cause the phenomenon that conductive filament fracture and since exposed conductive filament receives the electromagnetic interferences such as extraneous WiFi module caused by operation
Abnormal signal phenomenon, increase the stability and reliability of sensor itself.
Waterproof ventilated membrane 14 is by polytetrafluoroethylene (PTFE), gathered vinyl fluoride, polytetrafluoroethylene (PTFE)-hexafluoropropylene copolymer, poly- four
The third vinyl ether copolymers of vinyl fluoride-perfluor, polyethylene-TFE copolymer, polyimides, silicon rubber or silicon fluoride rubber system
At gas diffusion membrane, with excellent water resistance, can allow gas molecule free in and out sensor shell 11 and water
And dust etc. can not pass through.
Cell body 12 includes that semisolid electrolyte layer 121 and the anode being arranged in 121 both sides of semisolid electrolyte layer are electric
Pole 122 and cathode electrode 123, anode electrode 122 and cathode electrode 123 pass through anode conducting silk 124 and cathode conductive filament respectively
125 carry out electric signal transmission.
As shown in Fig. 2, semisolid electrolyte layer 121 includes porous substrate 1211 and liquid electrolyte 1212, liquid electrolytic
Matter 1212 is placed in the hole of porous substrate 1211.Semisolid electrolyte layer 121 plays isolation anode and cathode gas and offer
The effect in proton transfer channel.Porous substrate 1211 can be porous ceramic plate, porous polytetrafluoroethylene sheet, porous PVC plate or
Plate-like substrate made of porous e-PTFE plates plays the supporting role in structure, and provides memory space for liquid electrolyte 1212.
Liquid electrolyte 1212 can be the combination of one or more of acidic electrolyte baths such as sulfuric acid, phosphoric acid, benzene sulfonic acid, benzoic acid,
It can also be the combination of one or more of neutral electrolytes such as sodium chloride solution, liquor kalii acetici, can also be hydroxide
The combination of one or more of the alkaline electrolytes such as sodium solution, potassium hydroxide solution, calcium hydroxide solution.Have in the prior art
Serve as the sensor of formaldehyde sensor proton transfer medium using solid electrolyte, but formaldehyde due to its molecule particularity with
And compare the Property comparison for being difficult to be aoxidized and be suitable for liquid electrolyte, due to proton transfer speed when using solid electrolyte
More slowly the speed entirely chemically reacted can be influenced, and then influences the response time of formaldehyde gas sensor, so that it cannot in time
It is effective that early warning is provided.
The active constituent of anode electrode 122 and the catalyst on cathode electrode 123 can be golden (Au), rhodium (Rh), platinum
(Pt), the mixture of ruthenium (Ru), palladium (Pd), iridium (Ir), a kind of metal in silver-colored (Ag) or several metals, can also be support in
Above-mentioned metal on conductive carbon particle or metal mixture, i.e., above-mentioned metal or metal mixture are supported on conductive carbon particle,
Conductive carbon particle therein can be the combination of one or more of carbon black, carbon nanotube or activated carbon, it is preferred to use support
In metal or metal mixture on conductive carbon particle.Specific used catalysis on anode electrode 122 and cathode electrode 123
The active constituent of agent is corresponding with used liquid electrolyte, because some catalyst are active in acidic electrolyte bath
By force, activity of some catalyst in neutral electrolyte is strong, and then activity is strong in the alkaline electrolyte for some catalyst.
The type of liquid electrolyte 1212, porous substrate used by the aperture of the hole of porous substrate 1211 is decided by
The aperture of the hole of 1211 designs is just suitable with the molecular size of liquid electrolyte 1212, i.e., identical, can provide in this way
Best liquid electrolyte store function, if the molecule of aperture ratio liquid electrolyte 1212 is small, liquid electrolyte 1212
Molecule cannot be introduced into hole to will appear the phenomenon of leakage existing for conventional neat liquid electrolyte；If aperture ratio liquid electrolytic
The molecule of matter 1212 is big, then liquid electrolyte 1212 can free in and out hole, not only will appear conventional neat liquid electrolysis in this way
Dry-out existing for matter, the gas molecule that there is also anode and cathode occur by the phenomenon that is ganged up mutually in the gap in hole
The low phenomenon of sensitivity caused by potential is offset.In addition to this molecular structure of the porous substrate 1211 selected by is wanted and liquid electric
There is certain matching between the molecule of solution matter 1212, intermolecular force can be formed, to reinforce porous substrate 1211
The ability for storing liquid electrolyte 1212, to provide best proton transfer performance and best gas-insulated effect.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
Within all these improvement or transformation should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of formaldehyde gas sensor, which is characterized in that shell (11), the battery for detecting formaldehyde gas including sealing
On body (12), conductive filament pinboard (13) and waterproof ventilated membrane (14), the cell body (12) and the cell body (12)
Cathode conductive filament (125) and anode conducting silk (124) are sealingly mounted in the shell (11), the cathode conductive filament
(125) it is electrically connected with pcb board by conductive filament pinboard (13) with anode conducting silk (124), the conductive filament pinboard (13)
It is fixedly mounted on the outer wall of the shell (11), through hole, the waterproof ventilated membrane (14) is offered on the shell (11)
At the through hole.
2. formaldehyde gas sensor according to claim 1, which is characterized in that protrude out shape on the outer wall of the shell (11)
At having welding column (113), the welding column (113) to be integrally formed with the shell (11), the conductive filament pinboard (13) has
Have a welding port (131) and two pad terminals (132) for being fixed on pcb board, the welding port (131) with it is described
Welding column (113) is fixedly connected by way of hot melt.
3. formaldehyde gas sensor according to claim 2, which is characterized in that the shell (11) includes upper shell
(111) and lower housing (112) it, is realized by way of ultrasonic bonding between the upper shell (111) and lower housing (112) close
Seal welding.
4. formaldehyde gas sensor according to claim 3, which is characterized in that the upper shell (111), lower housing
(112) and welding column (113) is made of ABS, PC or PE；The waterproof ventilated membrane (14) is by polytetrafluoroethylene (PTFE), gathered
Vinyl fluoride, polytetrafluoroethylene (PTFE)-hexafluoropropylene copolymer, the third vinyl ether copolymers of polytetrafluoroethylene (PTFE)-perfluor, polyethylene-tetrafluoro second
Gas diffusion membrane made of alkene copolymer, polyimides, silicon rubber or silicon fluoride rubber.
5. formaldehyde gas sensor according to claim 1, which is characterized in that the cell body (12) includes semisolid electricity
It solves matter layer (121) and the anode electrode (122) and cathode electrode in semisolid electrolyte layer (121) both sides is set
(123), the anode electrode (122) and the cathode electrode (123) are led by the anode conducting silk (124) and cathode respectively
Electrical filament (125) carries out electric signal transmission；The semisolid electrolyte layer (121) includes porous substrate (1211) and liquid electrolyte
(1212), the liquid electrolyte (1212) is placed in the hole of the porous substrate (1211).
6. formaldehyde gas sensor according to claim 5, which is characterized in that the hole of the porous substrate (1211)
Aperture is identical as the molecular size for the liquid electrolyte (1212) put.
7. formaldehyde gas sensor according to claim 5, which is characterized in that the molecule knot of the porous substrate (1211)
There is matching between structure and the molecule of liquid electrolyte (1212) and form intermolecular force.
8. formaldehyde gas sensor according to claim 5, which is characterized in that the porous substrate (1211) is porous pottery
Plate-like substrate made of porcelain plate, porous polytetrafluoroethylene sheet, porous PVC plate or porous e-PTFE plates；The liquid electrolyte
(1212) include at least one of sulfuric acid, phosphoric acid, benzene sulfonic acid or the liquid electrolyte (1212) includes sodium chloride, vinegar
At least one of sour potassium or the liquid electrolyte (1212) include in sodium hydroxide, potassium hydroxide, calcium hydroxide extremely
Few one kind.
9. formaldehyde gas sensor according to claim 5, which is characterized in that the anode electrode (122) and cathode electricity
The active constituent of catalyst on pole (123) includes golden (Au), rhodium (Rh), platinum (Pt), ruthenium (Ru), palladium (Pd), iridium (Ir), silver
At least one of (Ag).
10. formaldehyde gas sensor according to claim 9, which is characterized in that the anode electrode (122) and cathode electricity
The active constituent of catalyst on pole (123) is supported on conductive carbon particle, and the conductive carbon particle includes carbon black, carbon nanometer
At least one of pipe, activated carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810348495.5A CN108318567A (en) | 2018-04-18 | 2018-04-18 | A kind of formaldehyde gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810348495.5A CN108318567A (en) | 2018-04-18 | 2018-04-18 | A kind of formaldehyde gas sensor |
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| CN108318567A true CN108318567A (en) | 2018-07-24 |
Family
ID=62897778
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| CN201810348495.5A Pending CN108318567A (en) | 2018-04-18 | 2018-04-18 | A kind of formaldehyde gas sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572211A (en) * | 2018-07-27 | 2018-09-25 | 深圳市朗得力科技有限公司 | A kind of electrochemistry formaldehyde sensor |
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