CN113933257B - Detection device for TVOC in air - Google Patents
Detection device for TVOC in air Download PDFInfo
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- CN113933257B CN113933257B CN202111292805.4A CN202111292805A CN113933257B CN 113933257 B CN113933257 B CN 113933257B CN 202111292805 A CN202111292805 A CN 202111292805A CN 113933257 B CN113933257 B CN 113933257B
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- 150000002894 organic compounds Chemical class 0.000 claims abstract description 30
- 239000006249 magnetic particle Substances 0.000 claims abstract description 20
- 238000004451 qualitative analysis Methods 0.000 claims abstract description 8
- 238000004445 quantitative analysis Methods 0.000 claims abstract description 8
- 238000001228 spectrum Methods 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
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- 238000004887 air purification Methods 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
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Abstract
The invention relates to a detection device for 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 detector (31) is arranged in the main body (3), and nano activated carbon magnetic particles are coated on the surface of the parabolic detector (31); 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 detector (31), the near infrared light emitter (5) emits near infrared light to the parabolic detector (31), and the external near infrared light is partially absorbed, partially reflected and detected through the near infrared detector (4). Compared with the prior art, the invention can carry out qualitative, quantitative and structural analysis on the organic compound, and has high detection precision and rapid reaction.
Description
Technical Field
The invention relates to the field of air purification, in particular to a detection device for TVOC in air.
Background
TVOC is one of the three types of pollution that affects indoor air quality more severely. TVOC is an organic substance with saturated vapor pressure exceeding 133.32pa at room temperature, the boiling point of the organic substance is 50-250 ℃, the organic substance can be evaporated at normal temperature and exists in the air, and the organic substance has toxicity, irritation, carcinogenicity and special odor, can influence skin and mucous membrane and can cause acute damage to human body.
Because TVOC is various in composition, the detection difficulty is high, and the mechanisms and equipment for accurately measuring the pollutant in China are fewer at present. The technical equipment for detecting TVOC has higher requirements, and gas chromatography is usually adopted, but Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography, reflection interference spectroscopy, solid polymer electrochemical principles and the like are also adopted.
Patent application CN202110669580.3 discloses a method and 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; comprising the following steps: acquiring a concentration value P of an indoor TVOC and crowd type information X; and controlling the air conditioner to start a purification mode according to the P and the X. By acquiring the concentration value P of the TVOC and the crowd type information X, the control air conditioner can take different measures aiming at different tolerance degrees of different crowds on the TVOC concentration, so that the purpose of effectively monitoring and purifying the TVOC is achieved; meanwhile, the method is more beneficial to energy conservation and environmental protection. The method mainly performs purification through an air conditioner, has a narrow application area, and cannot perform qualitative air quality detection, namely, cannot measure what volatile organic compound gas is contained in air.
Patent application CN202021701958.0 discloses an indoor air quality detection system, which comprises an upper cover and a rear cover which is matched with the upper cover, wherein a containing space is formed between the upper cover and the rear cover, a control main board is arranged in the containing space, a loudspeaker placing groove is arranged on the rear cover, a loudspeaker is arranged on the rear cover, a sensor PCB board is also arranged on the rear cover, and a small board shell for protecting the sensor PCB board is arranged on the rear cover; the control main board is connected with a rechargeable battery; the control main board is respectively and electrically connected with the loudspeaker, the sensor PCB board, the millimeter wave radar, the infrared sensor, the LCD screen and the PM2.5 sensor. The utility model has high detection integration level, can detect PM2.5, TVOC, CO2, temperature and relative humidity, formaldehyde, non-contact human body temperature measurement and radar sleep monitoring, supports connection with a cloud server, stores real-time data cloud and pushes data, has small and portable appearance, can be used for detecting the air quality of a car, 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 air.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the device for detecting the TVOC in the air, which has high detection precision and quick response.
The aim of the invention can be achieved by the following technical scheme: the detection device for the TVOC in the 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 detector is arranged in the main body, and the surface of the parabolic detector is coated with nano activated carbon magnetic particles; air to be detected is sucked into the main body through the fan, TVOC in the air is adsorbed on the surface of the parabolic detector, the near infrared light emitter emits near infrared light to the parabolic detector, and the external near infrared light is partially absorbed, partially reflected and detected through the near infrared detector.
Further, the device also comprises a spectrum analyzer, the spectrum analyzer is used for analyzing the reflected spectrum and comparing 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 the unknown type and quantity of the organic compound is realized.
Further, the main body is tubular, one end is connected with the fan, the other end is connected with the base, a parabolic detector which is bent towards the inside 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 arranged on the base and are opposite to the parabolic detector.
Further, the main body is made of quartz glass, the parabolic detector is a parabolic quartz glass body, and nano activated carbon magnetic particles are coated on the surface of the parabolic detector and used for adsorbing organic compound molecules in air to be detected.
Further, the relationship between the height y of the parabolic detector and the distance x of the bottom plane is: y= ±1.45x 2.
Further, the particle size of the nano activated carbon magnetic particles is 5-10 nm, the pore diameter is 0.1-0.5mm, the specific surface area is more than 300m 2/g, and the coating thickness is 0.5-2 mm.
Further, the near infrared detector is opposite to the center of the parabolic detector and is used for collecting near infrared light reflected by the parabolic quartz glass body, part of external near infrared light irradiated on the nanometer activated carbon magnetic particle coating is absorbed by activated carbon particles, and part of external near infrared light irradiated on the organic compound is reflected back, and is transmitted to a receiving surface of the near infrared detector through the focusing function of the parabolic quartz glass body, and the reflected spectrum is analyzed through a spectrum analyzer and 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 the unknown type and quantity of organic compound is realized.
Further, the near infrared light emitters are annularly arranged on the circuit board, and generate infrared near infrared light after being electrified, and irradiate the infrared near infrared light to the nano activated carbon magnetic particle coating.
Further, the pipe joint is made of PVC material, so that the acid and alkali corrosion resistance is good; the base is made of PVC material and is used for installing and fixing the near infrared light generator and the near infrared light detector.
Further, the fan is driven by a 12V direct current micro motor, and the operation is noiseless.
Compared with the prior art, the invention has the following beneficial effects:
1. The invention adopts near infrared light reflection spectrometry, has high detection precision, and the positive and negative deviation is not more than 5%. The reaction is rapid, and the response time is less than 10 seconds. Has higher application value.
2. The main body of the testing device with the nano activated carbon magnetic particle layer coated on the outer surface can be conveniently detached, and the adsorption function can be regenerated through heating of an oven, so that the testing device can be recycled.
3. The adsorption characteristic of the nano activated carbon magnetic small sphere particles is good for adsorbing organic molecules in air, and the nano activated carbon magnetic small sphere particles are very stable in property and do not react with adsorbed organic compound molecules chemically;
4. The adsorption performance regeneration function of the nano activated carbon magnetic small sphere particles, when the adsorbed organic compounds of the nano activated carbon magnetic small sphere particles reach saturation, the adsorption of the organic compounds in the air cannot be continued, the nano activated carbon magnetic small sphere particles are required to be placed in an oven for continuous drying for more than half an hour, and the adsorbed organic compounds are released for regeneration of the adsorption function;
5. The near infrared light spectrum analyzer can be used for carrying out qualitative, quantitative and structural analysis on the organic compound, and has wide application; the near infrared light analyzer has powerful data storage and transmission functions, can transmit measured data to a computer, is operated through professional data analysis software, and has friendly working interface.
6. Simple structure, fewer used spare parts, low production and use cost and convenient application.
Drawings
FIG. 1 is a schematic view of the TVOC detecting apparatus according to the present invention;
FIG. 2 is a schematic diagram of a TVOC detection device according to the present invention;
FIG. 3 is a schematic structural diagram of a TVOC detecting device according to the present invention;
Fig. 4 is a schematic diagram of a TVOC detection apparatus according to the present invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
The pipe joint is a conventional commercial pipe joint, is convenient to use as a portable measuring device, can be used in various places needing to measure air quality, and is used in places such as schools, offices, shops, houses, laboratories and the like.
The fan is driven by a 12V direct current micro motor, has no noise in operation and is a commercial product.
The near infrared detector is a commercial product, such as IRONE DEVICE micro intelligent near infrared spectrometer sensor available from sea energy instruments Co.
The near infrared light emitter is commercially available, such as NIRONE SENSOR available from sea energy instruments
The spectrum analyzer used is a commercially available product such as SPECTRASTARTM available from the sea energy instruments Inc.
Example 1
As shown in fig. 1-4, a detection device for 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 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 connected with the base 6, and the near infrared detector 4 and the near infrared light emitter 5 are arranged on the base 6 and are opposite to the parabolic detection body 31.
The pipe joint 1 is made of PVC material, and has good 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 detector 31 is arranged in the main body 3, and nano activated carbon magnetic particles are coated on the surface of the parabolic detector 31; the nanometer activated carbon magnetic particles are prepared from activated carbon, iron powder and an adhesive (common commercially available adhesive) according to a mass ratio of 6:3.5:0.5 to be mixed into slurry, and the slurry is coated on the surface of the parabolic detector 31, wherein the particle size of the nano activated carbon magnetic particles is 5-10 nm, the pore diameter is 0.1-0.5 mm, and the specific surface area is more than 300m 2/g;
The nanometer activated carbon magnetic particles can also adopt commercial products, such as regenerated activated carbon filter cores (namely, adopting nitrogen and sulfur functionalized carbon foam magnetic microspheres in ZL201510359764.4 as regenerated activated carbon) developed by De Zhao technology (Shanghai) limited company, and the regenerated activated carbon, iron powder and adhesive (common commercial adhesive) are mixed according to the mass ratio of 6:3.5: mixing the materials into slurry according to the proportion, adding water into the slurry to prepare slurry, and coating the slurry with the thickness of 0.5-2 mm.
The main body 3 is made of quartz glass, the parabolic detector 31 is a parabolic quartz glass body, and nano activated carbon magnetic particles are coated on the surface of the parabolic quartz glass body and are used for adsorbing organic compound molecules in air to be detected. The relationship between the height y of the parabolic detector 31 and the distance x from the bottom plane is: y= ±1.45x 2.
The near infrared detector 4 is opposite to the center of the parabolic detector 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, and generate infrared near infrared light after being electrified, and irradiate the infrared near infrared light to the nano activated carbon magnetic particle coating.
The device also comprises a spectrum analyzer, the spectrum analyzer is used for analyzing the reflected spectrum and comparing 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 the unknown type and quantity of the organic compound is realized.
When in use, the utility model is characterized in that:
The air to be detected containing the unknown kind and quantity of organic compound is sucked into the cavity of the detection device main body 3 under the drive of the fan 2, organic molecules collide with the surface of the parabolic detection body 31 (the outer surface of which is coated with nano activated carbon magnetic particles) and are absorbed by the nano activated carbon magnetic beads to generate accumulation, after a period of accumulation, the organic molecules are gathered in a large quantity in the nano activated carbon magnetic particle coating on the outer surface of the parabolic quartz glass body, at this time, the near infrared light emitters 4 (arranged in a ring) integrated on the circuit board are electrified to generate infrared near infrared light, part of the external near infrared light irradiated onto the activated carbon coating is absorbed by the nano activated carbon magnetic particles, and at the same time, part of the external near infrared light irradiated onto the organic compound is reflected back, and is transmitted to the receiving surface of the near infrared detector 4 through the focusing action of the parabolic detection body 31, and the spectrum reflected back is analyzed through the spectrum analyzer, and the known organic compound reflection spectrum is compared in a contrast, so that the quantitative analysis of the organic compound in the air to be detected containing the unknown kind and quantity of the organic compound is realized. The near infrared spectrum analyzer has powerful data storage and transmission functions, can transmit measured data to a computer, is operated by professional data analysis software (SPECTRASTAR XL/SPECTRASTAR1400XL carried by the sea energy instruments and the company Limited instruments), and has friendly working interface and convenient operation.
Wherein the known organic compound reflectance spectra can be obtained by querying the spectroscopic analysis report of the existing organic compounds, the functional group of each specific organic compound being specific to the spectrum used.
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 is a device which utilizes different substance elements to have different refraction lights, and when the refraction lights of the excited substance elements are the refraction lights of the general process detector of the spectrum principle, the spectrum analyzer can perform qualitative analysis on unknown substances after detecting the spectrum.
The invention adopts near infrared light reflection spectrometry, has high detection precision, and the positive and negative deviation is not more than 3 percent. The reaction is rapid, and the response time is less than 10 seconds. Has higher application value.
Technical parameters
| Response time | ≤10S |
| Linearity error | ±2％F.S |
| Resolution ratio | 0.01PPM |
| Service life of the product | More than or equal to 1000 times |
| Operating temperature range | 10- +50% (Without condensation) |
| Communication interface | USB/Bluetooth 2.0 |
| Size (W x L x H) | 125x125x175mm |
| Weight of (E) | 3.5Kg |
。
Claims (8)
1. The detection device for 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 nano activated carbon magnetic particles are coated on the surface of the parabolic detection body (31); 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 detector (31), the near infrared light emitter (5) emits near infrared light to the parabolic detector (31), and the external near infrared light is partially absorbed and partially reflected and is detected through the near infrared detector (4);
The device also comprises a spectrum analyzer, wherein the spectrum analyzer is used for analyzing the reflected spectrum and comparing 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 the unknown type and quantity of the organic compound is realized;
the main body (3) is tubular, one end is connected with the fan (2), the other end is connected with the base (6), a parabolic detector (31) which is bent towards the inside of the main body is arranged at one end connected with the base (6), and the near infrared detector (4) and the near infrared light emitter (5) are arranged on the base (6) and are opposite to the parabolic detector (31).
2. The device for detecting TVOC in air according to claim 1, wherein the main body (3) is made of quartz glass, the parabolic detecting body (31) is a parabolic quartz glass body, and nano activated carbon magnetic particles are coated on the surface of the parabolic quartz glass body for adsorbing organic compound molecules in air to be detected.
3. The device for detecting TVOC in air according to claim 2, wherein the height y of said parabolic detector (31) is related to the distance x from the bottom plane by: y= ±1.45x 2.
4. The device for detecting TVOC in air according to claim 1, wherein the particle size of the nano activated carbon magnetic particles is 5-10 nm, the pore diameter is 0.1-0.5 mm, the specific surface area is more than 300m 2/g, and the coating thickness is 0.5-2 mm.
5. The device for detecting TVOC in air according to claim 1, wherein said near infrared detector (4) is disposed opposite to the center of the parabolic detector body (31) for collecting near infrared light reflected from the parabolic quartz glass body.
6. The device for detecting TVOC in air according to 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, and irradiate the infrared near infrared light onto the nano activated carbon magnetic particle coating.
7. The device for detecting TVOC in air according to claim 1, wherein the pipe joint (1) and the base (6) are made of PVC.
8. The device for detecting TVOC in air according to 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 CN113933257A (en) | 2022-01-14 |
| CN113933257B true CN113933257B (en) | 2024-06-07 |
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