CN112305166A - Air chamber for laboratory toxin detection agent gas sensor and detection method - Google Patents

Air chamber for laboratory toxin detection agent gas sensor and detection method Download PDF

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Publication number
CN112305166A
CN112305166A CN202011151052.0A CN202011151052A CN112305166A CN 112305166 A CN112305166 A CN 112305166A CN 202011151052 A CN202011151052 A CN 202011151052A CN 112305166 A CN112305166 A CN 112305166A
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gas
detection
macromolecular
air outlet
air
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CN202011151052.0A
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Chinese (zh)
Inventor
蒋华宁
王怀璋
梁婷
陈静飞
蒲军礼
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Insititute Of Nbc Defence
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Insititute Of Nbc Defence
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Priority to CN202011151052.0A priority Critical patent/CN112305166A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—Specially adapted to detect a particular component
    • G01N33/0047—Specially adapted to detect a particular component for organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—Specially adapted to detect a particular component
    • G01N33/0047—Specially adapted to detect a particular component for organic compounds
    • G01N33/0049—Specially adapted to detect a particular component for organic compounds for halogenated organic compounds

Abstract

The invention relates to the field of sensor detection equipment, in particular to a gas chamber and a detection method for a gas sensor for detecting a toxic agent in a laboratory. The first aspect of the present invention provides a detection method for laboratory detection of a gas sensor of a macromolecular toxic agent, comprising the steps of: preprocessing, namely removing impurities and purifying the gas to be detected; and detecting, namely detecting the gas to be detected by the gas sensitive element. The invention provides in a second aspect a gas cell for a laboratory gas sensor for the detection of a macromolecular toxic agent, comprising: the cavity comprises an air inlet, a first air outlet and a second air outlet; the first filter membrane is arranged at the first air outlet; the first filtering membrane is used for filtering out small air molecules and intercepting toxic agent gas macromolecules. The gas sensor can remove impurities and purify gas to be detected so as to reduce the workload of the gas sensitive element, eliminate the influence of dust, water vapor and the like on a detection result and the damage of the gas sensitive element, and improve the accuracy and the service life of the sensor.

Description

Air chamber for laboratory toxin detection agent gas sensor and detection method
Technical Field
The invention relates to the field of sensor detection equipment, in particular to a gas chamber and a detection method for a gas sensor for detecting a toxic agent in a laboratory.
Background
The gas sensor is used for detecting the concentration and the components of the gas, converts the types of the gas and the information related to the concentration into electric signals, and can obtain the information related to the existence condition of the gas to be detected in the environment according to the strength of the electric signals, thereby being capable of carrying out detection, monitoring and alarming; and an automatic detection, control and alarm system can be formed by the interface circuit and a computer, and plays an important role in environmental protection and safety supervision. In the prior art, toxic and harmful gases can be detected by using a gas sensor, and CO are common2、NO、NO2、NH3、SO2、CH4、O3And the like, and also can detect macromolecular toxic agent gases with larger toxicity and molecules, such as dimethyl methylphosphonate (DMMP), dichloroethyl sulfide (mustard gas) and the like. The gas sensor comprises a gas sensor, which is a key device for converting the gas type and the information related to the gas type and the concentration into an electric signal, and determines the performance of the gas sensor, such as sensitivity, response time and the like.
In the prior art, a macromolecular toxicant gas detection sensor has no selectivity to gas to be detected, all sucked foreign gas flows through a gas sensitive element, great burden is brought to the identification work of the gas sensitive element, and the sensitivity, the response time and the accuracy of the sensor are influenced. Some large particulate matter can even damage the sensor, especially semiconductor sensors when the humidity of the sample is high.
Therefore, there is a need in the art for a gas cell and detection method for a laboratory toxicant detection gas sensor.
The invention is provided in view of the above.
Disclosure of Invention
The invention aims to provide a gas chamber for a laboratory toxin agent detection gas sensor with a prolonged service life and a detection method, so as to solve at least one technical problem.
Specifically, the first aspect of the present invention provides a detection method for laboratory detection of a gas sensor of a macromolecular toxic agent, comprising the steps of:
preprocessing, namely removing impurities and purifying the gas to be detected;
and detecting, namely detecting the gas to be detected by the gas sensitive element.
By adopting the technical scheme, the gas of the macromolecular toxicant comprises organic macromolecular toxic gas with high toxicity such as dimethyl methylphosphonate (DMMP), dichloroethyl sulfide (mustard gas) and the like, the gas of the macromolecular toxicant can cause great damage to a living body at a very small concentration, and the gas sensitive element is a core element of a gas detection sensor of the macromolecular toxicant and is used for detecting the gas of the macromolecular toxicant; the pretreatment in the step can remove and purify the gas to be detected so as to reduce the workload of the gas sensitive element, eliminate the influence of dust, water vapor and the like on the detection result and the damage of the gas sensitive element, and improve the accuracy and the service life of the sensor.
Further, the pre-treatment comprises the following steps:
and carrying out first filtration on the gas to be measured to remove air molecules.
The air molecules refer to molecules common in air, such as nitrogen, oxygen, water vapor and the like.
By adopting the technical scheme, the first filtering greatly reduces the volume of the gas to be detected, reduces the detection time, improves the concentration of the gas of the macromolecular toxicant, and reduces false negative of detection caused by too low concentration so as to improve the accuracy; the total molecular number of the gas to be detected is reduced, the detection time of the gas sensitive element is shortened, and the use times are relatively prolonged.
Further, the pre-treatment comprises the following steps:
and carrying out second filtration on the gas to be measured to remove solid matters.
By adopting the technical scheme, the second filtering can reduce the damage to the gas sensitive element caused by solid matters such as dust and the like flowing to the gas sensitive element along with the airflow, so that the service life of the gas sensitive element is prolonged, and the influence of the damage on the accuracy of the gas sensitive element is reduced.
Further, the pre-treatment comprises the following steps:
and carrying out third filtration on the gas to be measured to remove water vapor.
By adopting the technical scheme, the water vapor is filtered out by the third filter, so that the adsorption of the gas sensitive element on the water vapor is reduced, the sensitivity is improved, and the corrosion of the gas sensitive element of the water vapor can be reduced.
The invention provides in a second aspect a gas cell for a laboratory gas sensor for the detection of a macromolecular toxic agent, comprising:
the cavity comprises an air inlet, a first air outlet and a second air outlet;
the first filtering membrane is arranged at the first air outlet; the first filtering membrane is used for filtering out small air molecules and intercepting toxic agent gas macromolecules.
By adopting the technical scheme, the first filtering membrane is used for purifying and concentrating the macromolecular toxic agent gas in the gas to be detected, so that the total volume of the gas is reduced, and the service life of the gas sensitive element is prolonged.
Further, the first filter membrane is arranged at the joint of the first air outlet and the cavity.
By adopting the technical scheme, the first filtering membrane is convenient to fix.
Preferably, the pore size of the first filtering membrane is 0.4-0.5 nm.
By adopting the technical scheme, the first filtering membrane can filter out common air molecules and intercept the gas of the macromolecular toxic agent in the cavity.
Preferably, the first filter membrane is made of polyacrylamide.
By adopting the technical scheme, the first filtering membrane has strong mechanical property, is not easy to damage, can keep better pressure difference, and improves the filtering speed of air molecules.
Further, a second filtering membrane is arranged at the air inlet and used for filtering solid particles.
By adopting the technical scheme, the second filtering membrane can filter out solid particles, reduce the damage of the solid particles in the gas to be detected to the gas sensitive element, and prolong the service life of the gas sensitive element.
Preferably, the pore size of the second filtration membrane is 0.1 to 0.3 μm.
More preferably, the second filtration membrane pore size is 0.3 microns.
By adopting the technical scheme, the second filtering aperture can intercept solid particles and simultaneously facilitates the passing of air molecules and toxin molecules.
Preferably, the second filter membrane is a hepa (high Efficiency particulate air) filter membrane, and may be a PP filter paper, a glass fiber, a composite PP-PET filter paper, a melt-blown polyester non-woven fabric, a melt-blown glass fiber, or the like.
By adopting the technical scheme, the second filtering membrane can bear collision and friction of solid particles, and the service life is prolonged.
Further, a drying layer is arranged at the second air outlet.
Preferably, a third filtering membrane is arranged at the second air outlet, and the third filtering membrane is coated with a hydrophobic material.
Preferably, the pore size of the third filtration membrane is 0.1 to 0.3 μm.
Preferably, the hydrophobic material is a ternary block copolymer Pt BA-b-PDMS-b-Pt BA.
By adopting the technical scheme, the third filter membrane can reduce the detection deviation caused by the water vapor absorbed by the gas sensitive element, improve the detection accuracy of the gas sensitive element, reduce the corrosion of the water vapor to the gas sensitive element and prolong the service life of the gas sensitive element; the first filtering membrane can greatly reduce the content of water vapor, reduce the pressure of the third filtering membrane and prolong the service life of the third filtering membrane.
Further, the position of the air inlet and the position of the first air outlet are both lower than half of the height of the cavity.
Adopt above-mentioned technical scheme, make gaseous space disperse for the gas that awaits measuring that is located first filtration membrane is more even, reduces the influence of air current to first filtration membrane.
Further, at least one of the air inlet, the first air outlet and the second air outlet is tubular.
Adopt above-mentioned technical scheme, be convenient for install the breather pipe, the parcel of second filtration membrane, third filtration membrane to air inlet, second gas outlet also is convenient for.
Further, the second air outlet is arranged at the top of the cavity.
By adopting the technical scheme, the cavity is stably placed, the structure is compact, and the gas to be detected can be conveniently sent from the gas inlet to the second gas outlet.
Furthermore, the cavity, the air inlet, the first air outlet and the second air outlet are integrally formed and are made of rigid materials.
By adopting the technical scheme, the air tightness of the whole air chamber is ensured, and the air chamber is conveniently connected with the vent pipe.
Furthermore, the cavity is made of transparent materials wholly or partially. The transparent material can be any one of common glass, high silica glass, quartz glass, toughened glass, organic glass (PMMA), Polycarbonate (PC), polypropylene (PP), polyvinyl chloride (PVC), Polystyrene (PS), acrylonitrile styrene copolymer (SAN), transparent ABS and polyethylene glycol terephthalate (PET).
By adopting the technical scheme, whether the first filtering membrane is broken or not is convenient to check, so that the first filtering membrane can be replaced in time.
Furthermore, at least one of the air inlet, the first air outlet and the second air outlet is provided with a fillet or a chamfer.
By adopting the technical scheme, the mechanical property of the connecting part of the air inlet, the first air outlet or the second air outlet and the cavity is improved.
Further, the gas chamber for the laboratory detection of the gas sensor of the macromolecular toxicant comprises a gas chamber cap and a closing piece, wherein the gas chamber cap and the closing piece are detachably connected, and the gas chamber cap and the closing piece form the cavity.
Adopt above-mentioned technical scheme, can dismantle the connection be convenient for right the installation or the change of first filtration membrane, can dismantle the connection can be spiro union, cup joint, lock joint etc..
Further, the closing part is a soft plug which is made of elastic materials.
By adopting the technical scheme, the disassembly is convenient, and the air tightness of the joint of the air chamber cap is enhanced.
Further, at least one of air inlet, second gas outlet is provided with coupling assembling, coupling assembling is including connecting main part and attachment, it can dismantle with attachment to connect the main part and be connected, it is used for being connected with the breather pipe to connect main part one end, attachment one end is used for being connected with at least one of air inlet, first gas outlet, second gas outlet.
Preferably, the connection main part and the connection accessory are connected by a screw thread.
By adopting the technical scheme, the connecting component is convenient for the vent pipe to be connected with the air inlet, the first air outlet or the second air outlet, so that the detachable connection is realized; connecting can also set up filtration membrane between main part, the attach fitting, like first filtration membrane, second filtration membrane, third filtration membrane, filtration membrane's area can with connect main part looks adaptation, also can wrap up attach fitting one end, it overlaps in the filtration membrane outside to connect the main part, filtration membrane plays sealed effect to coupling assembling.
Further, coupling assembling still includes the annular pad, the annular pad sets up connect between main part, the attach fitting, the annular pad adopts the elastic material. The elastic material can be one of polyphenyl ether (PPE), polyolefin thermoplastic elastomer (TPO), thermoplastic ethylene propylene diene monomer dynamic vulcanized elastomer (TPE), styrene thermoplastic elastomer (SBS), Natural Rubber (NR) and Butadiene Rubber (BR).
Adopt above-mentioned technical scheme, the annular pad increases the gas tightness of coupling assembling junction.
Further, the outer wall of the connecting main part is provided with an annular boss.
By adopting the technical scheme, the vent pipe is sleeved outside the connecting main part, the annular boss increases the friction force between the vent pipe and the connecting main part to prevent the vent pipe from falling off, and the air tightness between the vent pipe and the connecting main part is also increased.
Further, the connecting main part is provided with a convex rib.
By adopting the technical scheme, the convex ribs are convenient for applying force to the connecting main part, and the friction force is increased.
Furthermore, a limiting shoulder is arranged inside the connecting main part and used for limiting the movement of the filtering membrane.
By adopting the technical scheme, the air tightness inside the connecting main part is improved.
In conclusion, the invention has the following beneficial effects:
1. the first filtration greatly reduces the volume of the gas to be detected, reduces the detection time, improves the concentration of the gas of the macromolecular toxicant, and reduces false negative of detection caused by too low concentration so as to improve the accuracy; the total molecular number of the gas to be detected is reduced, the detection time of the gas sensitive element is reduced, and the use times are relatively prolonged;
2. the secondary filtration can reduce the damage to the gas sensitive element caused by solid matters such as dust and the like flowing to the gas sensitive element along with the airflow, so that the service life of the gas sensitive element is prolonged, and the influence of the damage on the accuracy of the gas sensitive element is reduced;
3. a air chamber for laboratory detection macromolecular poison gas sensor utilizes first filtration membrane, second filtration membrane, third filtration membrane's setting, realizes reducing the gaseous volume that awaits measuring, improves detection rate and rate of accuracy, reduces the damage to gas sensitive element.
4. The third filter removes water vapor, so that the adsorption of the gas sensitive element on the water vapor is reduced, the sensitivity is improved, and the corrosion of the gas sensitive element on the water vapor can be reduced;
5. the cavity is integrally formed with the air inlet, the first air outlet and the second air outlet and is made of rigid materials, so that the air tightness of the whole air chamber is ensured, and the vent pipe is conveniently connected with the air inlet, the first air outlet and the second air outlet;
6. the cavity is made of transparent materials, so that whether the first filtering membrane is broken or not can be checked conveniently, and the first filtering membrane can be replaced in time;
7. the closing piece is a soft plug, is convenient to disassemble, and also enhances the air tightness of the joint of the closing piece and the air chamber cap.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of one embodiment of the detection method for detecting a gas sensor of a macromolecular toxic agent in a laboratory according to the present invention;
FIG. 2 is a schematic view of another embodiment of the detection method for detecting a gas sensor of a macromolecular toxic agent in a laboratory according to the present invention;
FIG. 3 is a schematic front view of an embodiment of a gas cell for a laboratory macromolecular toxin detection gas sensor according to the present invention;
FIG. 4 is a schematic perspective view of one embodiment of a gas cell for a laboratory macromolecular toxicant detection gas sensor according to the present invention;
FIG. 5 is a schematic front view of another embodiment of a gas cell for a laboratory macromolecular toxin detection gas sensor according to the present invention;
FIG. 6 is a schematic perspective view of yet another embodiment of a gas cell for a laboratory macromolecular toxicant detection gas sensor according to the present invention;
FIG. 7 is a cross-sectional view of one embodiment of a connecting body of the present invention.
Description of the reference numerals
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
1. A cavity; 11. an air inlet; 111. round corners; 12. a first air outlet; 13. a second air outlet; 14. an air chamber cap; 15. a closure; 16. connecting the main part; 161. an annular boss; 162. a rib; 163. a limiting shoulder; 17. connecting accessories; 18. an annular pad; 2. a first filter membrane; 3. a second filter membrane; 4. a third filter membrane.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The present invention will be described in detail below by way of examples.
Referring to fig. 1, a first aspect of the present invention provides a detection method for laboratory detection of a gas sensor of a macromolecular toxic agent, comprising the steps of:
s100, preprocessing, namely removing impurities and purifying gas to be detected;
and S200, detecting, namely detecting the gas to be detected by the gas sensitive element.
By adopting the technical scheme, the gas of the macromolecular toxicant comprises organic macromolecular toxic gas with high toxicity such as dimethyl methylphosphonate (DMMP), dichloroethyl sulfide (mustard gas) and the like, the gas of the macromolecular toxicant can cause great damage to a living body at a very small concentration, and the gas sensitive element is a core element of a gas detection sensor of the macromolecular toxicant and is used for detecting the gas of the macromolecular toxicant; the pretreatment in the step can remove and purify the gas to be detected so as to reduce the workload of the gas sensitive element, eliminate the influence of dust, water vapor and the like on the detection result and the damage of the gas sensitive element, and improve the accuracy and the service life of the sensor.
Referring to fig. 2, in a preferred embodiment of the present invention, the s100. preprocessing includes the steps of:
s120, carrying out first filtration on the gas to be measured to remove air molecules.
The air molecules refer to molecules common in air, such as nitrogen, oxygen, water vapor and the like.
By adopting the technical scheme, the first filtering greatly reduces the volume of the gas to be detected, reduces the detection time, improves the concentration of the gas of the macromolecular toxicant, and reduces false negative of detection caused by too low concentration so as to improve the accuracy; the total molecular number of the gas to be detected is reduced, the detection time of the gas sensitive element is shortened, and the use times are relatively prolonged.
In a preferred embodiment of the present invention, the s100. preprocessing includes the steps of:
s110, carrying out second filtration on the gas to be measured to remove solid matters.
By adopting the technical scheme, the second filtering can reduce the damage to the gas sensitive element caused by solid matters such as dust and the like flowing to the gas sensitive element along with the airflow, so that the service life of the gas sensitive element is prolonged, and the influence of the damage on the accuracy of the gas sensitive element is reduced.
In a preferred embodiment of the present invention, the s100. preprocessing includes the steps of:
s130, carrying out third filtration on the gas to be detected to remove water vapor.
By adopting the technical scheme, the water vapor is filtered out by the third filter, so that the adsorption of the gas sensitive element on the water vapor is reduced, the sensitivity is improved, and the corrosion of the gas sensitive element of the water vapor can be reduced.
Referring to subject 3 and figure 4, a second aspect of the present invention provides a gas cell for laboratory detection of a macromolecular toxicant gas sensor, comprising:
the air conditioner comprises a cavity 1, wherein the cavity 1 comprises an air inlet 11, a first air outlet 12 and a second air outlet 13;
a first filter membrane 2, said first filter membrane 2 being arranged at said first outlet port 12; the first filtering membrane 2 is used for filtering out small air molecules and intercepting toxic agent gas macromolecules.
In the specific implementation process, the air inlet 11 is used for introducing gas to be detected, the first air outlet 12 is connected with an air pump to pump out air molecules in the introduced gas to be detected, after the gas to be detected in the cavity 1 is saturated, the gas molecules of the macromolecular toxicant escape from the second air outlet 13 due to the internal and external pressure difference, flow to equipment connected at the back, and are led to the gas sensitive element.
Adopt above-mentioned technical scheme, first filtration membrane 2 purifies the concentration to the macromolecular poison gas in the gas that awaits measuring, reduces gaseous total volume, prolongs gas sensitive element's life.
In a preferred embodiment of the invention, the first filter membrane 2 is mounted at the junction of the first outlet 12 and the chamber 1.
By adopting the technical scheme, the first filtering membrane 2 is convenient to fix.
In a preferred embodiment of the present invention, the first filtration membrane 2 has a pore size of 0.4 to 0.5 nm.
By adopting the technical scheme, the first filtering membrane 2 can filter out common air molecules and intercept the gas of the macromolecular toxic agents in the cavity 1.
In a preferred embodiment of the present invention, the first filter membrane 2 is made of polyacrylamide.
By adopting the technical scheme, the first filtering membrane 2 has strong mechanical property, is not easy to damage, can keep better pressure difference, and improves the filtering speed of air molecules.
In a preferred embodiment of the present invention, a second filter membrane 3 is disposed at the gas inlet 11, and the second filter membrane 3 is used for filtering solid particles.
By adopting the technical scheme, the second filtering membrane 3 can filter out solid particles, reduce the damage of the solid particles in the gas to be detected to the gas sensitive element, and prolong the service life of the gas sensitive element.
In a preferred embodiment of the present invention, the pore size of the second filtration membrane 3 is 0.1 to 0.3 μm.
In a preferred embodiment of the present invention, the second filtration membrane 3 has a pore size of 0.3 μm.
By adopting the technical scheme, the second filtering aperture can intercept solid particles and simultaneously facilitates the passing of air molecules and toxin molecules.
In a preferred embodiment of the present invention, the second filter membrane 3 is a hepa (high Efficiency particulate air) filter membrane, and may be made of PP filter paper, glass fiber, composite PP-PET filter paper, melt-blown polyester non-woven fabric, melt-blown glass fiber, or the like.
By adopting the technical scheme, the second filtering membrane 3 can bear the collision and friction of solid particles, and the service life is prolonged.
In a preferred embodiment of the present invention, a drying layer is disposed at the second air outlet 13.
In a specific implementation process, the drying layer may be dehumidified by absorbing water vapor with silica gel or the like, or a hydrophobic film may be used to isolate water molecules in the cavity 1.
In a preferred embodiment of the present invention, a third filter membrane 4 is arranged at the second gas outlet 13, and the second filter membrane 3 and/or the third filter membrane 4 are/is coated with a hydrophobic material.
In a preferred embodiment of the present invention, the pore size of the third filtration membrane 4 is 0.1 to 0.3 μm.
In a preferred embodiment of the present invention, the hydrophobic material is a triblock copolymer Pt BA-b-PDMS-b-Pt BA.
In a specific implementation, the third filter membrane 4 may be a hepa (high Efficiency particulate air) filter membrane, and the side coated with the hydrophobic material faces the cavity 1.
By adopting the technical scheme, the third filter membrane 4 can reduce the detection deviation caused by the water vapor absorbed by the gas sensitive element, improve the detection accuracy of the gas sensitive element, reduce the corrosion of the water vapor to the gas sensitive element and prolong the service life of the gas sensitive element; the first filtering membrane 2 can greatly reduce the content of water vapor, reduce the pressure of the third filtering membrane 4 and prolong the service life of the third filtering membrane 4.
In a preferred embodiment of the present invention, the position of the air inlet 11 and the position of the first air outlet 12 are both lower than half of the height of the chamber 1.
Adopt above-mentioned technical scheme, make gaseous space disperse for the gas that awaits measuring that is located first filtration membrane 2 is more even, reduces the influence of air current to first filtration membrane 2.
In a preferred embodiment of the present invention, at least one of the air inlet 11, the first air outlet 12, and the second air outlet 13 has a tubular shape.
Adopt above-mentioned technical scheme, be convenient for install the breather pipe, also be convenient for second filtration membrane 3, third filtration membrane 4 to the parcel of air inlet 11, second gas outlet 13.
In a preferred embodiment of the present invention, the second air outlet 13 is disposed at the top of the chamber 1, and the air inlet 11 and the first air outlet 12 are disposed at the side wall of the chamber 1.
Adopt above-mentioned technical scheme, be convenient for cavity 1 steadily places, and compact structure is convenient for wait to examine among the gas air micromolecule from air inlet 11 to second gas outlet 13, and the gaseous from the second gas outlet 13 of the poison agent of macromolecule overflows.
In a preferred embodiment of the present invention, the chamber 1 is integrally formed with the air inlet 11, the first air outlet 12, and the second air outlet 13, and is made of a rigid material.
By adopting the technical scheme, the air tightness of the whole air chamber is ensured, and the air chamber is conveniently connected with the vent pipe.
In a preferred embodiment of the present invention, the cavity 1 is made of a transparent material in whole or in part. The transparent material can be any one of common glass, high silica glass, quartz glass, toughened glass, organic glass (PMMA), Polycarbonate (PC), polypropylene (PP), polyvinyl chloride (PVC), Polystyrene (PS), acrylonitrile styrene copolymer (SAN), transparent ABS and polyethylene glycol terephthalate (PET).
By adopting the technical scheme, whether the first filtering membrane 2 is broken or not is convenient to check, so that the first filtering membrane can be replaced in time.
In a preferred embodiment of the present invention, at least one of the air inlet 11, the first air outlet 12, and the second air outlet 13 is provided with a rounded corner 111 or a chamfer.
By adopting the technical scheme, the mechanical performance of the connecting part of the air inlet 11, the first air outlet 12 or the second air outlet 13 and the cavity 1 is improved.
Referring to fig. 5, in a preferred embodiment of the present invention, the gas cell for laboratory detection of a macromolecular toxic agent gas sensor comprises a gas cell cap 14 and a closing member 15, the gas cell cap 14 and the closing member 15 are detachably connected, and the gas cell cap 14 and the closing member 15 constitute the cavity 1.
Adopt above-mentioned technical scheme, can dismantle the connection be convenient for right the installation or the change of first filtration membrane 2, can dismantle the connection can be spiro union, cup joint, lock joint etc..
In a preferred embodiment of the invention, the closure member 15 is a cork, which is made of an elastic material.
In a specific implementation process, the elastic material is one of polyphenylene ether (PPE), polyolefin thermoplastic elastomer (TPO), thermoplastic ethylene propylene diene monomer dynamic vulcanized elastomer (TPE), styrene thermoplastic elastomer (SBS), Natural Rubber (NR), and Butadiene Rubber (BR).
By adopting the technical scheme, the disassembly is convenient, and the air tightness of the joint of the air chamber cap 14 is enhanced.
Referring to fig. 6 and 7, in a preferred embodiment of the present invention, at least one of the air inlet 11, the second air outlet 12, and the second air outlet 13 is provided with a connecting assembly, the connecting assembly includes a connecting main part 16 and a connecting accessory 17, the connecting main part 16 is detachably connected to the connecting accessory 17, one end of the connecting main part 16 is used for connecting with a ventilation pipe, and one end of the connecting accessory 17 is used for connecting with at least one of the air inlet 11, the first air outlet 12, and the second air outlet 13.
In a preferred embodiment of the invention, the connection body 16 and the connection appendage 17 are connected by means of a screw thread.
By adopting the technical scheme, the connecting component is convenient for the vent pipe to be connected with the air inlet 11, the first air outlet 12 or the second air outlet 13, so that the detachable connection is realized; filtering membranes, such as a first filtering membrane 2, a second filtering membrane 3 and a third filtering membrane 4, can be arranged between the connecting main part 16 and the connecting accessory 17, the area of the filtering membranes can be matched with that of the connecting main part 16, and also can be wrapped at one end of the connecting accessory 17, the connecting main part 16 is sleeved outside the filtering membranes, and the filtering membranes play a role in sealing the connecting assembly.
In a preferred embodiment of the present invention, the connecting assembly further includes a ring-shaped pad 18, the ring-shaped pad 18 is disposed between the connecting main member 16 and the connecting attachment 17, and the ring-shaped pad 18 is made of an elastic material. The elastic material can be one of polyphenyl ether (PPE), polyolefin thermoplastic elastomer (TPO), thermoplastic ethylene propylene diene monomer dynamic vulcanized elastomer (TPE), styrene thermoplastic elastomer (SBS), Natural Rubber (NR) and Butadiene Rubber (BR).
With the above technical solution, the annular pad 18 may be disposed at one side or both sides of the filter membrane, i.e. the first filter membrane 2, the second filter membrane 3 or the fourth filter membrane 4, and the annular pad 18 increases the air tightness at the connection of the connection assembly.
In a preferred embodiment of the present invention, the outer wall of the connecting main part 16 is provided with an annular boss 161.
By adopting the technical scheme, the vent pipe is sleeved outside the main connecting part 16, the annular boss 161 increases the friction force between the vent pipe and the main connecting part 16 to prevent the vent pipe from falling off, and the air tightness between the vent pipe and the main connecting part is also increased.
In a preferred embodiment of the present invention, the connecting main member 16 is provided with ribs 162.
By adopting the technical scheme, the convex rib 162 is convenient for applying force to the connecting main part 16, so that the friction force is increased.
In a preferred embodiment of the invention, the connection main part 16 is internally provided with a limit shoulder 163, said limit shoulder 163 limiting the movement of the filter membrane.
By adopting the technical scheme, the air tightness inside the connecting main part 16 is improved.
It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A detection method for laboratory detection of a gas sensor of a macromolecular toxic agent, comprising the steps of:
preprocessing, namely removing impurities and purifying the gas to be detected;
and detecting, namely detecting the gas to be detected by the gas sensitive element.
2. The detection method for laboratory detection of a gas sensor of a macromolecular toxic agent according to claim 1, characterized in that: the pretreatment comprises the following steps:
and carrying out first filtration on the gas to be measured to remove air molecules.
3. The detection method for laboratory detection of a gas sensor of a macromolecular toxic agent according to claim 2, characterized in that: the pretreatment comprises the following steps:
and carrying out second filtration on the gas to be measured to remove solid matters.
4. The detection method for laboratory detection of a gas sensor of a macromolecular toxic agent according to claim 3, characterized in that: the pretreatment comprises the following steps:
and carrying out third filtration on the gas to be measured to remove water vapor.
5. A gas cell for laboratory detection of a gas sensor for macromolecular toxicants, comprising:
the air conditioner comprises a cavity (1), wherein the cavity (1) comprises an air inlet (11), a first air outlet (12) and a second air outlet (13);
a first filter membrane (2), said first filter membrane (2) being arranged at said first air outlet (12); the first filtering membrane (2) is used for filtering out small air molecules and intercepting toxic agent gas macromolecules.
6. A gas cell for laboratory detection of macromolecular toxicants gas sensors according to claim 5, characterized in that: the first filtering membrane (2) is arranged at the joint of the first air outlet (12) and the cavity (1).
7. A gas cell for laboratory detection of macromolecular toxicants gas sensors according to claim 6, characterized in that: and a second filtering membrane (3) is arranged at the air inlet (11), and the second filtering membrane (3) is used for filtering solid particles.
8. Gas cell for the laboratory detection of macromolecular toxicants gas sensors according to any one of claims 5 to 7, characterized in that: and a drying layer is arranged at the second air outlet (13).
9. Gas cell for the laboratory detection of macromolecular toxicants gas sensors according to any one of claims 5 to 7, characterized in that: and a third filtering membrane (4) is arranged at the second air outlet (13), and the second filtering membrane (3) and/or the third filtering membrane (4) are/is coated with a hydrophobic material.
10. A gas cell for laboratory detection of macromolecular toxicants gas sensors according to claim 9, characterized in that: the position of the air inlet (11) and the position of the first air outlet (12) are both lower than half of the height of the cavity (1).
CN202011151052.0A 2020-10-24 2020-10-24 Air chamber for laboratory toxin detection agent gas sensor and detection method Pending CN112305166A (en)

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