CN113933257A - Detection apparatus for TVOC in air - Google Patents
Detection apparatus for TVOC in air Download PDFInfo
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- CN113933257A CN113933257A CN202111292805.4A CN202111292805A CN113933257A CN 113933257 A CN113933257 A CN 113933257A CN 202111292805 A CN202111292805 A CN 202111292805A CN 113933257 A CN113933257 A CN 113933257A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
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- 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
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
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- Spectroscopy & Molecular Physics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to a device for detecting TVOC in air, which comprises a pipe joint (1), a fan (2), a main body (3), a near-infrared detector (4), a near-infrared light emitter (5) and a base (6), wherein a parabolic detection body (31) is arranged in the main body (3), and the surface of the parabolic detection body (31) is coated with nano activated carbon magnetic particles; air to be detected is sucked into the main body (3) through the fan (2), TVOC in the air is adsorbed on the surface of the parabolic detection body (31), the near infrared light emitter (5) emits near infrared light to the parabolic detection body (31), the external near infrared light is partially absorbed, partially reflected and detected through the near infrared detector (4). Compared with the prior art, the utility model can carry out qualitative and quantitative analysis and structural analysis on the organic compound, has high detection precision and quick reaction.
Description
Technical Field
The utility model relates to the field of air purification, in particular to a TVOC (transient overvoltage protector) detection device in air.
Background
The TVOC is one of three kinds of pollution that affect indoor air quality more seriously. TVOC is an organic substance with saturated vapor pressure exceeding 133.32pa at room temperature, the boiling point of the TVOC is 50-250 ℃, the TVOC can exist in air in a form of evaporation at room temperature, and the TVOC has toxicity, irritation, carcinogenicity and special smell, can affect skin and mucous membrane, and can cause acute damage to human body.
Because TVOC constitutes a great variety, and the detection degree of difficulty is big, the mechanism and the equipment that can accurately measure this pollutant in the country are less at present. The technical equipment for detecting TVOC is high in requirement, and gas chromatography is generally adopted, but Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography and reflection interference spectroscopy, solid polymer electrochemical principle and the like are also adopted.
The patent application CN202110669580.3 discloses a method and a device for monitoring and purifying indoor TVOC in real time, and an air conditioner, wherein the method for monitoring and purifying indoor TVOC in real time is used for the air conditioner; the method comprises the following steps: acquiring a concentration value P and crowd type information X of the indoor TVOC; and controlling the air conditioner to start a purification mode according to the P and the X. By acquiring the concentration value P and the crowd type information X of the TVOC, the air conditioner is controlled to adopt different measures aiming at different crowds with different tolerance degrees on the TVOC concentration, so that the purpose of effectively monitoring and purifying the TVOC is achieved; meanwhile, the energy-saving and environment-friendly effects are better achieved. The method mainly purifies through an air conditioner, has narrow application range, and can not carry out qualitative detection on air quality, namely, which volatile organic compound gas is contained in the air can not be measured.
Patent application CN202021701958.0 discloses an indoor air quality detection system, which comprises an upper cover and a rear cover installed in cooperation with the upper cover, wherein an accommodating space is formed between the upper cover and the rear cover, a control main board is arranged in the accommodating space, the rear cover is provided with a horn placing groove and is provided with a horn, and the rear cover is also provided with a sensor PCB board and a small plate shell for protecting the sensor PCB board; the control mainboard is connected with a rechargeable battery; the control mainboard is respectively and electrically connected with loudspeaker, sensor PCB board, millimeter wave radar, infrared sensor, LCD screen and PM2.5 sensor. The utility model has high detection integration level, can detect PM2.5, TVOC, CO2, temperature and relative humidity, can detect formaldehyde, can detect non-contact human body temperature measurement and radar sleep monitoring, simultaneously supports connection with a cloud server, real-time data cloud storage and data push, has small and exquisite product appearance, is convenient to carry, can be used for car air quality detection, and has low cost. However, the detection system has low detection precision and cannot be used for qualitative and quantitative analysis of volatile organic compounds in the air.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a device for detecting TVOC in air, which has high detection precision and quick response.
The purpose of the utility model can be realized by the following technical scheme: a device for detecting TVOC in air comprises a pipe joint, a fan, a main body, a near-infrared detector, a near-infrared light emitter and a base, wherein a parabolic detection body is arranged in the main body, and the surface of the parabolic detection body is coated with nano activated carbon magnetic particles; air to be detected is sucked into the main body through the fan, the TVOC in the air is adsorbed on the surface of the parabolic detection body, the near-infrared light emitter emits near-infrared light to the parabolic detection body, the outer near-infrared light is partially absorbed and partially reflected, and the air is detected through the near-infrared detector.
Furthermore, the device also comprises a spectrum analyzer, and the spectrum analyzer analyzes the reflected spectrum and compares the reflected spectrum with the known organic compound reflection spectrum, so as to realize qualitative and quantitative analysis of the organic compound in the air to be measured containing unknown types and quantities of organic compounds.
Furthermore, the main body is tubular, one end of the main body is connected with the fan, the other end of the main body is connected with the base, a parabolic detection body which is bent towards the interior of the main body is arranged at one end connected with the base, and the near-infrared detector and the near-infrared light emitter are installed on the base and are opposite to the parabolic detection body.
Furthermore, the main body is made of quartz glass, the parabolic detection body is a parabolic quartz glass body, and the surface of the parabolic detection body is coated with nano activated carbon magnetic particles for adsorbing organic compound molecules in air to be detected.
Further, the relation between the height y of the parabolic detection body and the distance x of the bottom plane is as follows: y ═ 1.45x2。
Furthermore, the nano activated carbon magnetic particles have the particle size of 5-10 nm, the pore diameter of 0.1-0.5 mm and the specific surface area>300m2The coating thickness is 0.5-2 mm.
Furthermore, the near infrared detector is right opposite to the center of the parabolic detection body and is used for collecting near infrared light reflected by the parabolic quartz glass body, part of the external near infrared light irradiated on the nano activated carbon magnetic particle coating is absorbed by activated carbon particles, and part of the external near infrared light irradiated on the organic compound is reflected and transmitted to the receiving surface of the near infrared detector through the focusing effect of the parabolic quartz glass body, the reflected spectrum is analyzed through a spectrum analyzer and is compared with the known organic compound reflection spectrum, so that qualitative and quantitative analysis of organic compounds in air to be detected containing unknown types and quantities of organic compounds is realized.
Furthermore, the near-infrared light emitters are annularly arranged on the circuit board, and generate infrared near-infrared light after being electrified and irradiate the nano activated carbon magnetic particle coating.
Furthermore, the pipe joint is made of PVC materials, and is good in acid and alkali corrosion resistance; the base is made of PVC materials and is used for installing and fixing the near-infrared light generator and the near-infrared light detector.
Furthermore, the fan is driven by a 12V direct current micro motor, and the operation is noiseless.
Compared with the prior art, the utility model has the following beneficial effects:
firstly, the utility model adopts near infrared reflection spectroscopy, the detection precision is high, and the positive and negative deviation is not more than 5%. The reaction is rapid, and the response time is within 10 seconds. Has higher application value.
The core component of the measuring device and the testing device body with the outer surface coated with the nano activated carbon magnetic particle pattern layer can be conveniently detached and can be recycled by realizing the regeneration of the adsorption function through the heating of the oven.
The nano activated carbon magnetic small ball particles have good adsorption characteristics on organic molecules in the air, and are very stable in property and do not generate chemical reaction with adsorbed organic compound molecules;
fourthly, the adsorption performance regeneration function of the nano activated carbon magnetic small ball particles is realized, when the organic compounds adsorbed by the nano activated carbon magnetic small ball particles reach saturation, the organic compounds in the air can not be continuously adsorbed, and the nano activated carbon magnetic small ball particles need to be placed in an oven and continuously dried for more than half an hour to release the adsorbed organic compounds for the regeneration of the adsorption function;
the absorption and reflection characteristics of near infrared light, the light irradiates the organic compound, the spectrum reflected back is analyzed, and the comparison with the known reflection spectrum of the organic compound is carried out, so that the near infrared general analyzer can qualitatively, quantitatively and structurally analyze the organic compound, and has wide application; the near infrared light analyzer has powerful data storing and transmitting functions, can transmit the measured data to a computer, and is operated by professional data analysis software, so that the working interface is friendly.
Sixthly, the structure is simple, the number of used spare parts is small, the production and use cost is low, and the application is convenient.
Drawings
FIG. 1 is a schematic external view of a TVOC detection device according to the present invention;
FIG. 2 is a schematic diagram of the components of the TVOC detecting device according to the present invention;
FIG. 3 is a schematic structural diagram of a TVOC detection device according to the present invention;
fig. 4 is a schematic diagram of the TVOC detecting device according to the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The pipe joint is a conventional commercially available pipe joint, so that the device is convenient to use as a portable measuring device, and can be used in various places needing to measure air quality, such as schools, offices, markets, homes, laboratories and the like.
The fan is driven by a 12V direct current micro motor, operates without noise, and is a commercially available product.
The near infrared detector is a commercially available product, such as an IRONE DEVICE MINIATURE INTELLIGENT NEAR SPECTROMETER (R) sensor from the ocean energy instruments GmbH.
The near infrared light emitter is commercially available product, such as NIRONE SENSOR available from ocean energy instruments
The spectroscopic analyzer used is a commercially available product, for example, Spectrastart (TM) available from ocean energy instruments, Inc.
Example 1
As shown in fig. 1 to 4, the device for detecting TVOC in air comprises a pipe joint 1, a fan 2, a main body 3, a near-infrared detector 4, a near-infrared light emitter 5 and a base 6, wherein the main body 3 is tubular, one end of the main body 3 is connected with the fan 2, the other end of the main body is connected with the base 6, a parabolic detection body 31 which is bent towards the inside of the main body is arranged at one end of the main body which is connected with the base 6, and the near-infrared detector 4 and the near-infrared light emitter 5 are installed on the base 6 and are opposite to the parabolic detection body 31.
The pipe joint 1 is made of PVC materials and is good in acid and alkali corrosion resistance; the base 6 is made of PVC material and is used for installing and fixing the near-infrared light generator and the near-infrared light detector.
The fan 2 is driven by a 12V direct current micro motor, and the operation is noiseless.
A parabolic detection body 31 is arranged in the main body 3, and the surface of the parabolic detection body 31 is coated with nano activated carbon magnetic particles; the nano activated carbon magnetic particles are prepared from activated carbon, iron powder and an adhesive (common adhesive sold in the market) according to a mass ratio of 6: 3.5: 0.5, mixing into slurry, and coating on the surface of the parabolic detector 31, wherein the particle diameter of the nano activated carbon magnetic particles is 5-10 nm, and the pore diameter is0.1 to 0.5mm, specific surface area>300m2/g；
The nano activated carbon magnetic particles can also adopt commercial products, such as regenerative activated carbon filter elements developed by the research and development of the Showa science and technology (Shanghai) company Limited (namely, nitrogen and sulfur functional carbon foam magnetic microspheres in the patent number of ZL201510359764.4 are adopted as regenerative activated carbon), and the regenerative activated carbon, iron powder and adhesive (common adhesive sold in the market) are mixed according to the mass ratio of 6: 3.5: and (3) mixing the components into slurry with the mixing ratio of 0.5, adding water to prepare slurry, and coating the slurry with the coating thickness of 0.5-2 mm.
The main body 3 is made of quartz glass, the parabolic detection body 31 is a parabolic quartz glass body, and the surface of the parabolic detection body is coated with nano activated carbon magnetic particles for adsorbing organic compound molecules in air to be detected. The relationship between the height y of the parabolic detection body 31 and the distance x from the bottom plane is: y ═ 1.45x2。
The near-infrared detector 4 is directly opposite to the center of the parabolic detection body 31 and is used for collecting near-infrared light reflected by the parabolic quartz glass body.
The near-infrared light emitters 5 are annularly arranged on the printed circuit board, generate infrared near-infrared light after being electrified and irradiate the nano activated carbon magnetic particle coating.
The device also comprises a spectrum analyzer, and the spectrum analyzer analyzes the reflected spectrum and compares the reflected spectrum with the known organic compound reflection spectrum, so that the qualitative and quantitative analysis of the organic compound in the air to be detected containing unknown types and quantities of organic compounds is realized.
When in use:
air to be detected containing unknown types and quantities of organic compounds is sucked into a cavity of a detection device main body 3 under the drive of a fan 2, organic molecules collide on the surface of a parabolic detection body 31 (the outer surface of which is coated with nano activated carbon magnetic particles), are captured and adsorbed by nano activated carbon magnetic beads to generate accumulation, and after a period of accumulation, the organic molecules are accumulated in a large amount in a nano activated carbon magnetic particle coating on the outer surface of a parabolic quartz glass body, at the moment, a near infrared light emitter 4 (arranged into a ring assembly) integrated on a circuit board is electrified to generate infrared near infrared light, one part of the external near infrared light irradiated on the activated carbon coating is absorbed by the nano activated carbon magnetic particles, and meanwhile, one part of the external near infrared light irradiated on the organic compounds is reflected back, and the air is focused by the parabolic detection body 31, and the spectrum is transmitted to a receiving surface of the near-infrared detector 4, the spectrum analyzer analyzes the reflected spectrum, and the spectrum is compared with the known organic compound reflection spectrum, so that qualitative and quantitative analysis of the organic compound in the air to be detected containing unknown types and quantities of organic compounds is realized. The near infrared spectrum analyzer has powerful functions of data storage and transmission, can transmit measured data to a computer, and is operated by professional data analysis software (Spectrastar 2500XL/Spectrastar1400XL of a marine energy instrument, Inc., own), and the analysis software has a friendly working interface and is convenient to operate.
Wherein the known reflectance spectra of the organic compounds are obtained by interrogating the spectral analysis reports of the existing organic compounds, each specific pair of functional groups of the organic compounds being assigned a specific spectrum.
Most of the reflected light (about 80%) is transmitted to the detector of the near infrared detector 4 by refraction of the parabolic quartz glass body, the light is processed, the analog quantity of the light signal is converted into digital quantity, and finally the obtained data is displayed by a computer. The spectrum analyzer utilizes different refraction light of different substance elements, and can perform qualitative analysis on unknown substances after the refraction light of the excited substance elements, namely the spectrum detected by the rough process detector based on the spectrum principle.
The utility model adopts near infrared light reflection spectroscopy, has high detection precision, and has positive and negative deviation not more than 3%. The reaction is rapid, and the response time is within 10 seconds. Has higher application value.
Technical parameters
| Response time | ≤10S |
| Error of linearity | ±2％F.S |
| Resolution ratio | 0.01PPM |
| Service life | Not less than 1000 times |
| Operating temperature range | 10- +50 ℃ (no condensation) |
| Communication interface | USB/Bluetooth 2.0 |
| Size (W x L x H) | 125x125x175mm |
| Weight (D) | 3.5Kg |
。
Claims (10)
1. The device for detecting the TVOC in the air is characterized by comprising a pipe joint (1), a fan (2), a main body (3), a near-infrared detector (4), a near-infrared light emitter (5) and a base (6), wherein a parabolic detection body (31) is arranged in the main body (3), and the surface of the parabolic detection body (31) is coated with nano activated carbon magnetic particles; air to be detected is sucked into the main body (3) through the fan (2), TVOC in the air is adsorbed on the surface of the parabolic detection body (31), the near infrared light emitter (5) emits near infrared light to the parabolic detection body (31), the external near infrared light is partially absorbed, partially reflected and detected through the near infrared detector (4).
2. The apparatus for detecting TVOC in air of claim 1, further comprising a spectrum analyzer, wherein the spectrum analyzer analyzes the reflected spectrum, and compares the reflected spectrum with the known reflected spectrum of the organic compound, thereby performing qualitative and quantitative analysis on the organic compound in the air to be detected containing unknown types and amounts of organic compounds.
3. The apparatus for detecting TVOC in air according to claim 1, wherein the main body (3) is tubular, one end of which is connected to the fan (2) and the other end of which is connected to the base (6), and the end connected to the base (6) is provided with a parabolic detection body (31) bent toward the inside of the main body, and the near infrared detector (4) and the near infrared light emitter (5) are installed on the base (6) and opposite to the parabolic detection body (31).
4. The apparatus for detecting TVOC in air according to claim 1 or 3, wherein the material of the main body (3) is quartz glass, the parabolic detection body (31) is a parabolic quartz glass body, and the surface of the parabolic detection body is coated with nano activated carbon magnetic particles for adsorbing organic compound molecules in the air to be detected.
5. The apparatus for detecting TVOC in air as claimed in claim 4, wherein the relationship between the height y of the parabolic detection body (31) and the distance x of the bottom plane is: y ═ 1.45x2。
6. The device for detecting TVOC in air as claimed in claim 1, wherein the nano activated carbon magnetic particles have a particle size of 5-10 nm, a pore diameter of 0.1-0.5 mm, and a specific surface area>300m2The coating thickness is 0.5-2 mm.
7. The apparatus for detecting TVOC in air according to claim 1, wherein said near infrared detector (4) is disposed opposite to the center of the parabolic detection body (31) for collecting the near infrared light reflected back through the parabolic quartz glass body.
8. The apparatus for detecting TVOC in air as claimed in claim 1, wherein the near infrared light emitters (5) are annularly arranged on the circuit board, and generate infrared near infrared light after being electrified to irradiate on the nano activated carbon magnetic particle coating.
9. The apparatus for detecting TVOC in air as claimed in claim 1, wherein the pipe joint (1) and the base (6) are both made of PVC.
10. The apparatus for detecting TVOC in air as claimed in claim 1, wherein said fan (2) is driven by a 12V DC micro motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292805.4A CN113933257B (en) | 2021-11-03 | Detection device for TVOC in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292805.4A CN113933257B (en) | 2021-11-03 | Detection device for TVOC in air |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113933257A true CN113933257A (en) | 2022-01-14 |
| CN113933257B CN113933257B (en) | 2024-06-07 |
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