CN116577158A - Volatile organic compound sampling device - Google Patents
Volatile organic compound sampling device Download PDFInfo
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- CN116577158A CN116577158A CN202310679539.3A CN202310679539A CN116577158A CN 116577158 A CN116577158 A CN 116577158A CN 202310679539 A CN202310679539 A CN 202310679539A CN 116577158 A CN116577158 A CN 116577158A
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- 238000005070 sampling Methods 0.000 title claims abstract description 217
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000003780 insertion Methods 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 238000004321 preservation Methods 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 57
- 238000010926 purge Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 25
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000000945 filler Substances 0.000 description 11
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- VGQXTTSVLMQFHM-UHFFFAOYSA-N peroxyacetyl nitrate Chemical compound CC(=O)OO[N+]([O-])=O VGQXTTSVLMQFHM-UHFFFAOYSA-N 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- G01N1/2202—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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- 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—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
-
- 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
- G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a volatile organic compound sampling device, which comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, a plurality of heating sleeves are arranged in the sampling box, sampling pipes are arranged in the heating sleeves, a nitrogen tank is also arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel are respectively arranged in the air inlet box and the air outlet box, electromagnetic control valves are respectively arranged on the nitrogen tank, the air inlet conveying channel and the air outlet conveying channel, a locking structure is arranged among the air outlet box, the sampling box, the air inlet box and the sampling box, and the exhaust pipe made of copper is connected with the pretreatment box through a quick-insertion structure; the device can be connected to sampling system fast, ensures that sampling flow precision is between stipulated standards, conveniently saves and carries after the sampling is accomplished, can stably discharge volatile organic compounds when detecting, has effectively improved detection efficiency.
Description
Technical Field
The invention relates to the technical field of organic matter detection systems, in particular to a volatile organic matter sampling device.
Background
According to the definition of world health organization, volatile Organic Compounds (VOCs) are organic compounds at 50-250 ℃, the volatile organic compounds are atmospheric pollutants, have toxicity, participate in photochemical reactions under illumination conditions to form photochemical smog, generate ozone, peroxy acetyl nitrate and other pollutants, and are the core of control for the accuracy, the quality and the quantification of different types of volatile organic compounds; corresponding acquisition and detection standards of VOCs are standardized and executed in each field; at present, when collecting, the exhaust tube is placed at a sampling point, then the exhaust tube is connected with the sampling tube, and special absorption filler is contained in the sampling tube, so that volatile organic compounds reside on the absorption filler in the sampling tube, the sampling tube is connected with the exhaust pump, and the collection can be completed through the exhaust of the exhaust pump, but the current collecting device has the following defects:
1. at present, the exhaust tube adopts a silicone tube, the flow precision is kept between 0.1 and 1L/min, the diameter of the silicone tube is 0.5cm at most, the exhaust tube is further regulated after the appearance of the volatile organic compound standard, the flow precision is changed to be between 0.01 and 0.1L/min, the flow precision rises by one grade, the silicone tube cannot be too thin to meet the requirement, and volatile organic compounds can remain in the silicone tube during collection, so that the volatile organic compound cannot be discharged to influence the detection;
2. under the environment with serious moisture, the volatile organic compounds in the collected gas are directly collected through the exhaust pipe and mixed with the moisture to enter the sampling pipe, so that on one hand, the final detection is affected, and on the other hand, the absorption quality of the absorption filler in the sampling pipe is deteriorated, so that the use is affected;
3. at present, the sampling is generally carried out for a plurality of times, so that the accuracy of a sampling result is ensured, and therefore, a plurality of sampling pipes are required to be frequently disassembled and assembled, and the disassembly and assembly operations are very complicated;
4. after the sampling tube is sent to a laboratory, separate equipment is needed to heat the sampling tube so as to release volatile organic compounds in the absorbing filler, and after release is finished, separate cleaning is needed to be carried out on the sampling tube, and release and cleaning cannot be finished in one piece of equipment, so that the sampling tube also needs to be frequently disassembled and assembled;
5. the absorption filler in the sampling tube has strong absorption capacity to organic matters in the air, so that once the sampling tube is frequently contacted with the external air in the transportation process, the absorption filler can easily absorb volatile organic matters in the external air to cause inaccurate detection results.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a volatile organic compound sampling device can be quickly connected to a sampling system, ensures that the sampling flow precision is between specified standards, performs effective pretreatment on sampling gas, facilitates storage and transportation after sampling is completed, can stably discharge volatile organic compounds during detection, and effectively improves the detection efficiency.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a volatile organic compounds sampling device, includes preserves case body, pretreatment box body and exhaust tube, preserve case body, pretreatment box body and exhaust tube communicate in proper order, preserve case body includes inlet box, sampling case and outlet box, sampling case and inlet box stack in proper order and can dismantle the installation fixedly, be equipped with a plurality of heating sleeve in the sampling case, be equipped with corresponding sampling tube in the heating sleeve, still be equipped with the nitrogen tank in the sampling case, communicate between nitrogen tank and the inlet box, be equipped with respectively in inlet box and the outlet box with sampling tube both ends correspond sealed fit's inlet channel and outlet channel, each sampling tube is all through outlet box and inlet box compress tightly fixedly, all be equipped with the electromagnetic control valve that conveniently opens or close on inlet box, outlet box and the inlet box structure are the same, be equipped with the hasp structure between inlet box and the sampling box, be equipped with the box air inlet channel that conveniently, outlet box and outlet channel are equipped with on the inlet box, the inlet channel that can be equipped with the inlet channel and outlet channel that outlet channel are convenient, the outlet channel all be equipped with the inlet channel that outlet channel, outlet channel and outlet channel are all that outlet channel are all that outlet channel, the air channel are all that outlet channel are that outlet channel; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, and the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure; and a replacement connecting pipeline with a valve is also connected between the air inlet box and the air outlet box.
As a preferred scheme, air inlet and gas outlet have been seted up on the pretreatment box body, air inlet and gas outlet department are equipped with box body air inlet pipe and box body pipeline of giving vent to anger, box body air inlet pipe is through inserting structure and box body air outlet pipe intercommunication soon, be equipped with the pretreatment valve who conveniently opens and close on box body air inlet pipe and the box body air outlet pipe, box body air inlet pipe and box body air outlet pipe tip are quick-insertion structure, pretreatment box body inside seted up with air inlet and gas outlet switch-on pretreatment tube, the pretreatment tube includes heating portion and condensing part, heating portion is located the upper reaches of condensing part, the low bit department of condensing part is equipped with the condensate and collects the mouth, condensate is collected mouthful department and is equipped with the condensate collecting bottle of convenient dismouting, be connected with the exhaust tube through quick-insertion structure on the air outlet pipe.
As a preferable scheme, the air inlet box comprises an air inlet chamber, a plurality of air inlet conveying holes are formed in the air inlet chamber, each air inlet conveying hole is communicated with the air inlet conveying channel in a one-to-one correspondence manner, an upper guide chute for compacting and sealing the sampling tube is formed in the lower end part of the air inlet conveying channel, and an air inlet pipeline of the box body is communicated with the air inlet chamber; the box of giving vent to anger includes the cavity of giving vent to anger, set up a plurality of delivery pores of giving vent to anger in the cavity of giving vent to anger, each delivery pore of giving vent to anger with the delivery channel one-to-one intercommunication gives vent to anger, the lower direction chute that compresses tightly sealed sampling tube has been seted up to the upper end of delivery channel of giving vent to anger, the box air outlet pipe is put through with the cavity of giving vent to anger.
As a preferable scheme, a purging pipeline extending into the air inlet chamber is arranged on the nitrogen tank, and a quick-insertion structure convenient to assemble and disassemble is also arranged on the purging pipeline; elastic washers which are in contact with the sampling tube are arranged on the upper guide chute and the lower guide chute.
As a preferable scheme, the pretreatment pipe is a U-shaped pipe, the heating part comprises a heating pipe section which is positioned on the U-shaped pipe and communicated with the air inlet, a heating wire is arranged on the heating pipe section, the condensing part comprises a condensing pipe section which is communicated with the downstream of the heating pipe section, a condensing device for actively cooling is arranged on the condensing pipe section, an exhaust pipe section is communicated with the downstream of the condensing pipe section, and the exhaust pipe section is communicated with the air outlet.
As a preferable scheme, the condensing pipe section comprises a first pipe section and a second pipe section, the position of the first pipe section is higher than that of the second pipe section, the first pipe section and the second pipe section are communicated through a guide pipe section, and condensing devices are arranged on the first pipe section, the second pipe section and the guide pipe section.
As a preferable scheme, the first pipe section and the second pipe section are vertically installed, the condensate collecting port is arranged at the bottom of the second pipe section, and the condensate collecting port and the condensate collecting bottle are fixedly connected through threads.
As a preferred embodiment, the heating pipe section has a smaller diameter than the condensing pipe section.
As a preferred solution, the inner wall of the extraction tube is covered with an inert coating by means of an inert treatment.
As a preferable scheme, a handle which is convenient to grasp is rotatably arranged on the air inlet box.
After the technical scheme is adopted, the invention has the following effects: the volatile organic compound sampling device comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, the sampling box and the air inlet box are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves are arranged in the sampling box, corresponding sampling pipes are arranged in the heating sleeves, a nitrogen tank is also arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel which are correspondingly and hermetically matched with the two ends of the sampling pipes are respectively arranged in the air inlet box and the air outlet box, each sampling tube is tightly pressed and fixed through an air outlet box and an air inlet box, electromagnetic control valves which are convenient to open or close are arranged on the nitrogen tank, the air inlet conveying channel and the air outlet conveying channel, the air outlet box has the same structure as the air inlet box, a lock catch structure is arranged among the air outlet box, the sampling box, the air inlet box and the sampling box, a box air inlet pipeline which is convenient for air inlet is arranged on the air inlet box, a box air outlet pipeline which is convenient for air outlet is arranged on the air outlet box, switchable flow control valves are arranged on the box air inlet pipeline and the box air outlet pipeline, and the end parts of the box air inlet pipeline and the box air outlet pipeline are of quick-inserting structures; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, and the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure; a replacement connection pipeline with a valve is also connected between the air inlet box and the air outlet box; firstly, placing an exhaust pipe at a sampling point, connecting an exhaust pipe with an exhaust pump, opening a flow control valve, opening a corresponding first electromagnetic control valve in an air inlet box and an air outlet box, starting the operation of the exhaust pump, enabling sampling gas to enter the exhaust pipe at the moment, enabling the sampling gas to enter a pretreatment box body for processing the sampling gas, enabling the processed sampling gas to enter the air inlet pipe of the box body, then entering the air inlet box, enabling the sampling gas to enter a sampling pipe from the air inlet box again, enabling volatile organic matters in the sampling gas to be absorbed by absorbing fillers, enabling the rest of the sampling gas to enter the air outlet through the air outlet conveying channel in the air outlet box, finally discharging the residual sampling gas from the air outlet pipe, closing the first electromagnetic control valve in the air inlet box and the air outlet box, opening a corresponding second electromagnetic control valve, enabling the sampling gas to enter the corresponding sampling pipe, repeating the operation, enabling the rest of the sampling gas to be discharged, repeating the sampling, enabling the sampling to be enough, and finally closing all the corresponding electromagnetic control valves, stopping the exhaust pump, enabling the exhaust pipe to be removed from the sampling point, and enabling the box body to enter the air inlet pipe to be separated from the pretreatment box; then the preserving box body and the sampling pump are integrally moved into a clean environment, a valve on a replacement connecting pipeline is opened, and an air extracting pump is started to continuously extract air, so that external clean air enters an air inlet box, the replacement connecting pipeline and an air outlet box, after the sampled gas in the air inlet box and the sampled gas in the air outlet box are replaced, the air extracting pump stops and closes the valve on the replacement connecting pipeline, finally, the air outlet pipeline of the box body is separated from the air extracting pump, then, a flow control valve is closed, at the moment, the sampling pipe is preserved in the sampling box and is not contacted with external gas, and volatile organic compounds can be effectively preserved; when in detection, the box body air outlet pipeline and the box body air inlet pipeline are connected with a detection instrument, the external heating sleeve of the sampling pipe is appointed to work for heating the box body air outlet pipeline and the box body air inlet pipeline, the volatile organic matters in the sampling pipe begin to volatilize, and the volatile organic matters in the sampling pipe are separated from the absorption filler and are discharged from the air outlet pipeline, so that the detection is completed; each sampling tube can carry out the release detection operation of the volatile organic compounds according to the mode, the whole process does not need to frequently disassemble and assemble the sampling tubes, the operation is very convenient, and the detection efficiency is effectively improved; after detection is completed, the box body air outlet pipeline and the box body air inlet pipeline are separated from the detection instrument, then cleaning and purging work can be carried out, all heating sleeves can be started to heat all sampling pipes, and nitrogen purging is carried out, so that all volatile organic matters in the sampling pipes are purged and discharged, and the next use is convenient; the air outlet box, the sampling box and the air inlet box are sequentially stacked, detachably mounted and fixed, and the sampling pipe can be conveniently replaced.
The pretreatment box body is provided with an air inlet and an air outlet, the air inlet and the air outlet are provided with a box body air inlet pipeline and a box body air outlet pipeline, the box body air inlet pipeline is communicated with the box body air outlet pipeline through a quick-insertion structure, pretreatment valves which are convenient to open and close are arranged on the box body air inlet pipeline and the box body air outlet pipeline, the ends of the box body air inlet pipeline and the box body air outlet pipeline are of a quick-insertion structure, the pretreatment box body is internally provided with a pretreatment pipe communicated with the air inlet and the air outlet, the pretreatment pipe comprises a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, the low position of the condensing part is provided with a condensate collecting port, the condensate collecting port is provided with a condensate collecting bottle which is convenient to disassemble, the air outlet pipeline is connected with an exhaust pipe through a quick-insertion structure, the sample gas enters the box body air inlet pipeline, the heating part entering the pretreatment pipe from the air inlet is heated, the condensate collecting bottle enters the condensate collecting bottle after the moisture is separated, and the condensate collecting bottle enters the condensate collecting box body air outlet box from the air outlet pipeline, and the condensate collecting bottle is discharged from the air outlet box after the condensate collecting bottle is discharged from the air outlet pipeline; therefore, moisture in the sampling gas can be effectively removed, good dryness of the sampling gas is guaranteed, sampling flow accuracy can be guaranteed to be between specified standards, sampling is improved, and detection accuracy is improved.
The air inlet box comprises an air inlet chamber, a plurality of air inlet conveying holes are formed in the air inlet chamber, the air inlet conveying holes are communicated with the air inlet conveying channels in a one-to-one correspondence manner, an upper guide chute for compacting and sealing the sampling tube is formed in the lower end part of each air inlet conveying channel, and an air inlet pipeline of the box body is communicated with the air inlet chamber; the air outlet box comprises an air outlet cavity, a plurality of air outlet conveying holes are arranged in the air outlet cavity, each air outlet conveying hole is communicated with the air outlet conveying channel in a one-to-one correspondence manner, the upper end part of the air outlet conveying channel is provided with a lower guiding chute for compacting and sealing the sampling tube, and the air outlet pipeline of the box body is communicated with the air outlet cavity; like this the air inlet chamber all communicates with the conveying channel that admits air, makes sampling gas can get into arbitrary sampling pipe in, after the valve is opened, in sampling gas can get into corresponding sampling pipe fast, discharge from the conveying channel that gives vent to anger in the case of giving vent to anger again to have certain inclination on going up direction chute and the lower direction chute, go up direction chute and lower direction chute and mutually support like this, can fix sealed sampling pipe fast, when installing the air inlet box on sampling box, can fix a position the adjustment voluntarily, thereby the installation is accurate.
The nitrogen tank is provided with a purging pipeline extending into the air inlet chamber, and the purging pipeline is also provided with a quick-insertion structure which is convenient to assemble and disassemble; elastic washers which are in contact with the sampling tube are arranged on the upper guide chute and the lower guide chute; the purging pipeline can be quickly disassembled and assembled so as to facilitate the disassembly and assembly between the air inlet box and the sampling box, and the practicability is improved; the elastic gasket can enable the air inlet box and the air outlet box to have certain elasticity when being reinstalled, can effectively compress tightly and seal the two ends of the sampling tube, and improves the sampling efficiency.
Because the pretreatment pipe is a U-shaped pipe, the heating part comprises a heating pipe section which is positioned on the U-shaped pipe and communicated with the air inlet, a heating wire is arranged on the heating pipe section, the condensing part comprises a condensing pipe section which is communicated with the downstream of the heating pipe section, a condensing device for actively cooling is arranged on the condensing pipe section, an exhaust pipe section is communicated with the downstream of the condensing pipe section, and the exhaust pipe section is communicated with the air outlet; the U-shaped pipe can effectively help the condensate produced by the condensing pipe section during condensation to be effectively accumulated, so that the condensate is convenient to collect, the sampling gas can be effectively discharged from the exhaust pipe section, and the structure is more reasonable.
Because the condensing pipe section comprises a first pipe section and a second pipe section, the first pipe section is higher than the second pipe section, the first pipe section and the second pipe section are communicated through a guide pipe section, and condensing devices are arranged on the first pipe section, the second pipe section and the guide pipe section; when the position of the first pipe section is higher than that of the second pipe section, condensate can flow from high to low through the guide pipe section, so that the condensate can be effectively accumulated.
Because the first pipe section and the second pipe section are vertically arranged, the condensate collecting port is arranged at the bottom of the second pipe section, and the condensate collecting port and the condensate collecting bottle are fixedly connected through threads; the automatic falling of condensate can be caused by gravity through vertical installation, and the condensate is accumulated, so that the collection is convenient, and after the condensate is accumulated, the condensate enters the condensate collecting bottle from the condensate collecting opening, and after the bottle is full, the condensate collecting bottle is detached through rotation and replaced with a new one, the condensate can be continuously collected, so that the structure is simple, and a good collection effect is ensured.
And because the diameter of the heating pipe section is smaller than that of the condensing pipe section; therefore, the heating pipe section is convenient to be heated, the temperature of the sampled gas is fast to rise, and after the sampled gas enters the condensing pipe section, the space is enlarged, so that heat dissipation and cooling are facilitated.
And the inner wall of the exhaust tube is covered with the inert coating through inert treatment, so that the inside of the exhaust tube is smooth and durable, and the reaction or adhesion of volatile organic compounds in the sampling gas and the inner wall of the exhaust tube are prevented, and the subsequent detection is prevented from being influenced.
And because the handle convenient to grasp is rotatably arranged on the air inlet box, the whole movement is convenient after the sampling is finished.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the inside of an embodiment of the present invention;
FIG. 3 is a front view of a pre-processing cassette and exhaust tube according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structure of the inside of the holding tank according to the embodiment of the present invention;
FIG. 5 is a schematic view of the structure of the bottom of the inlet box of an embodiment of the invention;
FIG. 6 is a schematic view of the structure of FIG. 5 at A-A;
FIG. 7 is a schematic view of the structure of a sample box according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the structure of an outlet box according to an embodiment of the present invention;
in the accompanying drawings: 1. an air inlet box; 2. a sampling box; 3. an air outlet box; 4. heating the sleeve; 5. a sampling tube; 6. a nitrogen tank; 7. a box air inlet pipeline; 8. a box body air outlet pipeline; 9. a flow control valve; 10. a groove seat; 11. a lock base; 12. a lock body; 13. a clasp ring; 14. an air intake chamber; 141. an intake delivery hole; 15. an intake delivery passage; 16. an upper guide chute; 17. an air outlet chamber; 18. an air outlet delivery hole; 19. a lower guide chute; 20. an air outlet conveying channel; 21. an elastic washer; 22. purging the pipeline; 23. a gas quick connector; 24. an electromagnetic control valve; 25. a control screen; 26. a handle; 27. a pre-process cartridge; 28. an air inlet; 29. an air outlet; 30. a box body air inlet pipeline; 31. a box body air outlet pipeline; 32. a pretreatment valve; 33. an exhaust pipe; 34. heating the pipe section; 35. a heating wire; 36. a condensing tube section; 361. a first pipe section; 362. a second pipe section; 363. a flow guide pipe section; 37. an exhaust pipe section; 38. a semiconductor refrigeration sheet; 39. a condensate collection port; 40. a condensate collection bottle; 41. a first replacement conduit; 42. a second replacement conduit; 43. a communication pipe; 44. ball valve.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
As shown in fig. 1 to 8, a volatile organic compound sampling device comprises a preserving box body, a pretreatment box body 27 and an exhaust pipe 33, wherein the preserving box body, the pretreatment box body 27 and the exhaust pipe 33 are sequentially communicated, the preserving box body comprises an air inlet box 1, a sampling box 2 and an air outlet box 3, the sampling box 2 and the air inlet box 1 are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves 4 are arranged in the sampling box 2, corresponding sampling pipes 5 are arranged in the heating sleeves 4, a nitrogen tank 6 is also arranged in the sampling box 2, the nitrogen tank 6 is communicated with the air inlet box 1, an air inlet conveying channel 15 and an air outlet conveying channel 20 which are correspondingly matched with two ends of the sampling pipes 5 in a sealing manner are respectively arranged in the air inlet box 1 and the air outlet box 3, each sampling tube 5 is tightly pressed and fixed through an air outlet box 3 and an air inlet box 1, electromagnetic control valves 24 which are convenient to open or close are arranged on a nitrogen tank 6, an air inlet conveying channel 15 and an air outlet conveying channel 20, the air outlet box 3 has the same structure as the air inlet box 1, a lock catch structure is arranged among the air outlet box 3, the sampling box 2, the air inlet box 1 and the sampling box 2, a box air inlet pipeline 7 which is convenient to air inlet is arranged on the air inlet box 1, a box air outlet pipeline 8 which is convenient to air outlet is arranged on the air outlet box 3, switchable flow control valves 9 are arranged on the box air inlet pipeline 7 and the box air outlet pipeline 8, and the end parts of the box air inlet pipeline 7 and the box air outlet pipeline 8 are of quick-insertion structures; the box air inlet pipeline 7 is communicated with a pretreatment box 27 for carrying out pretreatment on sampling gas through a quick-insertion structure, and the pretreatment box 27 is connected with a copper exhaust tube 33 through the quick-insertion structure.
In this embodiment, the air inlet box 1, the sampling box 2 and the air outlet box 3 are rectangular structures with the same cross section size, and can be stacked, detachably and fixedly arranged in sequence, the locking structure comprises a groove seat 10 fixedly arranged on the air inlet box 1 and the air outlet box 3 and a lock seat 11 fixed on the sampling box 2, the lock seat 11 is provided with a lock body 12 rotating around a pin shaft fixed on the lock seat 11, the lock body 12 is hinged with a locking ring 13 corresponding to the groove seat 10, the locking ring 13 is buckled on the groove seat 10, then the lock body 12 is covered on the lock seat 11 by rotating the lock body 12, and the locking ring 13 firmly buckles the groove seat 10, so that the air inlet box 1 and the sampling box 2 or the air outlet box 3 and the sampling box 2 are firmly pressed and fixed.
Further, an air inlet 28 and an air outlet 29 are formed in the pretreatment box 27, a box air inlet pipeline 30 and a box air outlet pipeline 31 are arranged at the air inlet 28 and the air outlet 29, the box air inlet pipeline 7 is communicated with the box air outlet pipeline 31 through a quick-insertion structure, pretreatment valves 32 which are convenient to open and close are arranged on the box air inlet pipeline 30 and the box air outlet pipeline 31, the ends of the box air inlet pipeline 30 and the box air outlet pipeline 31 are of a quick-insertion structure, a pretreatment pipe communicated with the air inlet 28 and the air outlet 29 is formed in the pretreatment box 27, the pretreatment pipe comprises a heating part and a condensing part, the heating part is positioned at the upstream of the condensing part, a condensate collecting port 39 is arranged at the low position of the condensing part, a condensate collecting bottle 40 which is convenient to disassemble and assemble is arranged at the condensate collecting port 39, and a suction pipe 33 is connected to the air outlet pipeline through the quick-insertion structure; the exhaust pipe 33 is generally made of brass.
The quick-insertion structure comprises a gas quick connector 23, an air inlet pipeline end part is connected with a male head or a female head of the gas quick connector 23, the end parts of the air outlet pipelines are the same, and meanwhile, an exhaust pipe 33 is provided with the female head or the male head which is matched with the gas quick connector 23 at the air inlet pipeline, so that quick assembly and disassembly can be completed, and the efficiency is improved.
As shown in fig. 4, the air intake box 1 includes an air intake chamber 14, a plurality of air intake conveying holes 141 are formed in the air intake chamber 14, each air intake conveying hole 141 is correspondingly communicated with the air intake conveying channel 15, an upper guiding chute 16 for compacting and sealing the sampling tube 5 is formed at the lower end of the air intake conveying channel 15, and the air intake pipeline 7 of the box body is communicated with the air intake chamber 14; the air inlet conveying holes 141 are connected with the electromagnetic control valves 24 in a one-to-one correspondence manner, the electromagnetic control valves 24 are connected with the corresponding air inlet conveying channels 15 again, so that sampling gas can enter any one air inlet conveying channel 15, the upper end of the sampling tube 5 contacts with the upper guide chute 16 to finish the connection sealing of the upper end of the sampling tube 5, a single sampling tube 5 is required to sample during sampling, and therefore, only any electromagnetic control valve 24 is required to be opened during sampling, and the sampling gas can enter the corresponding sampling tube 5, so that the sampling is finished.
Further, the air outlet box 3 includes an air outlet chamber 17, a plurality of air outlet conveying holes 18 are formed in the air outlet chamber 17, each air outlet conveying hole 18 is correspondingly communicated with the air outlet conveying channel 20, a lower guiding chute 19 for compacting the sealed sampling tube 5 is formed at the upper end part of the air outlet conveying channel 20, and the box air outlet pipeline 8 is communicated with the air outlet chamber 17; after the electromagnetic control valve 24 in the air inlet box 1 is opened, the electromagnetic control valve 24 in the corresponding air outlet box 3 is also required to be synchronously opened, after the electromagnetic control valve 24 is opened, the volatile organic compounds are absorbed by the absorption filler in the sampling tube 5, the residual air is discharged from the sampling tube 5, then enters the air outlet cavity 17 through the air outlet conveying channel 20 and is discharged from the box air outlet pipeline 8, and the lower end of the sampling tube 5 is in contact seal with the lower guide chute 19 because the air outlet box 3 and the air inlet box 1 are identical in structure, so that the sampling tube 5 is communicated with the air outlet conveying channel 20, and the air outlet conveying channel 20 is sequentially communicated with the electromagnetic control valve 24 and the air outlet conveying hole 18.
As shown in fig. 1, the replacement connection pipeline includes a first replacement pipeline 41 connected to the air inlet chamber 14 and a second replacement pipeline 42 connected to the air outlet chamber 17, the first replacement pipeline 41 and the second replacement pipeline 42 are both provided with an openable valve and a gas quick connector 23, the valve is a ball valve 44, so that the first replacement pipeline 41 and the second replacement pipeline 42 can be quickly and conveniently closed, a communication pipeline 43 is arranged between the first replacement pipeline 41 and the second replacement pipeline 42, the first replacement pipeline 41 and the second replacement pipeline 42 can be connected through the communication pipeline, and the mutual disassembly among the air inlet box 1, the air outlet box 3 and the sampling box 2 is not affected.
The electromagnetic control valve 24 is controlled to be opened and closed accurately and effectively, the tedious operation of manually opening and closing one by one is omitted, the efficiency is improved, and the control screen 25 for controlling the electromagnetic control valve 24 to be opened and closed is arranged on the air inlet box 1, and the sampling sequence is required to be marked as the sampling tube 5 is sampled one by one during sampling, so that the subsequent detection is convenient, the sampling tube 5 and the electromagnetic control valve 24 can be displayed on the screen through the control screen 25 for convenient observation and operation, other operations can be carried out on the control screen 25, and the working efficiency is greatly improved.
Further, the lower guiding chute 19 and the upper guiding chute 16 are both conical grooves, so that the sampling tube 5 can be adjusted along the inclined plane of the conical grooves when the sampling tube 5 is installed, when the sampling tube 5 is assembled, the sampling box 2 and the air outlet box 3 are effectively fixed, then the sampling tube 5 is sequentially placed into the heating sleeve 4, the lower end of the sampling tube 5 is firstly contacted with the lower guiding chute 19, then the air inlet box 1 is installed on the sampling box 2, and the upper guiding chute 16 can press the sampling tube 5 after the upper guiding chute 16 is contacted with the upper end of the sampling tube 5, so that the sampling tube 5 can be in a vertical state, and thus, the sampling tube 5 is effectively and hermetically connected with the air inlet conveying channel 15 and the air outlet conveying channel 20, and the installation of the sampling tube 5 is completed.
In this embodiment, the nitrogen tank 6 is provided with a purge pipe 22 extending into the air inlet chamber 14, and the purge pipe 22 is also provided with a quick-insertion structure which is convenient to disassemble and assemble; elastic washers 21 which are in contact with the sampling tube 5 are arranged on the upper guide chute 16 and the lower guide chute 19; the nitrogen tank 6 and the sampling pipe 5 are installed jointly in the sampling box 2, space can be effectively saved, the height of the heating sleeve 4 is smaller than that of the sampling pipe 5, the purging pipeline 22 is a hose, after the valve for opening and closing is also arranged on the purging pipeline 22, when the air inlet box 1 and the sampling box 2 are separated, the valve is closed, the nitrogen tank 6 and the air inlet chamber 14 are disconnected through the quick-inserting structure, when the air inlet box 1 and the sampling box 2 are required to be installed together, the nitrogen tank 6 and the air inlet chamber 14 are only required to be connected through the quick-inserting structure, and when the sampling pipe 5 is installed, the elastic gasket 21 has certain elasticity, so that the two ends of the sampling pipe 5 can be further effectively pressed and sealed, and the sampling efficiency is improved.
As shown in fig. 3, the pretreatment pipe is a U-shaped pipe, the heating part comprises a heating pipe section 34 which is positioned on the U-shaped pipe and is communicated with the air inlet 28, a heating wire 35 is arranged on the heating pipe section 34, the condensing part comprises a condensing pipe section 36 which is communicated with the downstream of the heating pipe section 34, a condensing device for actively cooling is arranged on the condensing pipe section 36, an exhaust pipe section 37 is communicated with the downstream of the condensing pipe section 36, and the exhaust pipe section 37 is communicated with the air outlet 29; the pretreatment box 27 is a rectangular box, the heating pipe section 34, the condensation pipe section 36 and the exhaust pipe section 37 together form a U-shape, the heating pipe section 34 comprises a section extending from the air inlet 28 horizontally and a section with one end vertically downward, the heating pipe section 34 can be effectively heated by winding the heating wire 35 on the heating pipe section 34, the U-shaped pipe can effectively help the condensate generated by the condensation pipe section 36 during condensation to be effectively accumulated, the collection is convenient, the sampling gas can be effectively discharged from the exhaust pipe section 37, and the structure is more reasonable.
Further, the condensation pipe 36 includes a first pipe section 361 and a second pipe section 362, where the first pipe section 361 is higher than the second pipe section 362, the first pipe section 361 and the second pipe section 362 are communicated through a diversion pipe section 363, and condensation devices are disposed on the first pipe section 361, the second pipe section 362 and the diversion pipe section 363; the condensing unit includes a semiconductor refrigeration sheet 38, the semiconductor refrigeration sheet 38 is fixedly installed on the side walls of the first pipe section 361, the second pipe section 362 and the diversion pipe section 363, so that the temperature of the sampled gas flowing through the first pipe section 361, the second pipe section 362 and the diversion pipe section 363 can be reduced, the first pipe section 361 and the second pipe section 362 are vertically installed, the first pipe section 361 is connected to the downstream end of the heating pipe section 34, the first pipe section 361 is higher than the second pipe section 362, the diversion pipe section 363 is communicated with the first pipe section 361 and the second pipe section 362, the diversion pipe section 363 is in an inclined state, so that condensate is convenient to flow, the second pipe section 362 is fixedly installed at the bottom of the pretreatment box 27, and meanwhile, the condensate collecting port 39 is arranged at the bottom of the second pipe section 362, and the condensate collecting port 39 and the condensate collecting bottle 40 are fixedly connected through threads.
The condensate collecting opening 39 penetrates through the second pipe section 362 and the pretreatment box body 27, so that the condensate collecting bottle 40 can be installed outside the pretreatment box body 27 and connected with the second pipe section 362, and the condensate collecting bottle 40 can be quickly and conveniently detached by rotating the condensate collecting bottle 40, and the replacement convenience is improved.
In this embodiment, the heating wire 35 that facilitates heating is also disposed on the exhaust tube 33, and since the exhaust tube 33 is made of brass, heating at a certain temperature can be performed, so as to achieve the effect of preheating in advance, and ensure that the sampled gas is heated well.
Further, the diameter of the heating pipe section 34 is smaller than that of the condensing pipe section 36, so that after the sampled gas enters the heating pipe section 34, the space is small, the heating pipe section 34 is convenient to be heated, the temperature of the sampled gas is fast to rise, and then after the sampled gas enters the condensing pipe section 36, the space is enlarged, the heat dissipation effect is good, and the cooling speed can be increased by matching with the semiconductor refrigerating sheet 38, so that the sampled gas is dried.
Still further, the inner wall of the exhaust tube 33 is covered with an inert coating through inert treatment, so that the inside of the exhaust tube 33 is smooth and durable, and the reaction or adhesion of volatile organic compounds in the sampling gas and the inner wall of the exhaust tube 33 are prevented, thereby affecting the subsequent detection.
As shown in FIG. 4, the air inlet box 1 is rotatably provided with a handle 26 which is convenient to grasp, the storage box is integrally moved after collection, and the sampling tube 5 is positioned in the sampling box 2, so that the storage is convenient, and the efficiency is improved, but because the sampling tube 5 needs to be stored and moved to a designated place for detection after collection is completed, the sampling tube 5 is positioned in the storage box and can be effectively protected, and the storage box can be integrally moved through the grabbing handle 26 during movement, so that the convenience is improved.
The working principle of the embodiment is as follows: the air exhaust pipe 33 is arranged at a sampling point, the box body air outlet pipeline 8 is connected with an air exhaust pump, the pretreatment valve 32 on the box body air inlet pipeline 30 and the box body air outlet pipeline 31 is opened, the flow control valve 9 is opened, the control screen 25 simultaneously opens the corresponding first electromagnetic control valve 24 in the air inlet box 1 and the air outlet box 3, the air exhaust pump works, sampling gas enters the air exhaust pipe 33, the heating wire 35 on the air exhaust pipe 33 preheats the sampling gas, then the sampling gas enters the heating pipe section 34, the heating wire 35 is also opened for further heating, the sampling gas enters the condensing pipe section 36, firstly, the sampling gas enters the first pipe section 361, condensate generated after the sampling gas is cooled is condensed on the side wall of the first pipe section 361, drops along the first pipe section 361, then enters the guide pipe section 363 for further cooling, the generated condensate flows towards the bottom of the second pipe section 362 together with the inside of the first pipe section 361, the sample gas enters the second pipe section 362 and finally condenses, the generated condensate flows to the bottom of the second pipe section 362 along with the side wall of the second pipe section 362, enters the condensate collecting bottle 40 from the condensate collecting opening 39, the dried sample gas enters the exhaust pipe section 37 and finally is discharged into the box air inlet pipeline 7 from the box air outlet pipeline 31, then enters the air inlet chamber 14, enters the air inlet conveying channel 15 through the air inlet conveying hole 141, then passes through the corresponding sampling pipe 5, the volatile organic compounds are absorbed by the absorption filler in the sampling pipe 5, the residual sample gas enters the air outlet conveying channel 20, then enters the air outlet chamber 17, finally is discharged from the box air outlet pipeline 8, then closes the first electromagnetic control valve 24 in the air inlet box 1 and the air outlet box 3, opens the corresponding second electromagnetic control valve 24, and the sample gas enters the corresponding sampling pipe 5, repeating the above operations, sequentially opening the valves, and collecting a sufficient number of sampling tubes 5; after the sampling is finished, the sampling pump is stopped, the box body air inlet pipeline 30 is separated from the air exhaust pipe 33, and the box body air inlet pipe 7 is separated from the box body air outlet pipe 31; in the clean environment of the integral moving channel of the preservation box, a ball valve 29 is opened, a sampling pump is started to continuously exhaust, external clean air enters the air inlet box 1, the first replacement pipeline 27, the communication pipeline 30, the second replacement pipeline 28 and the air outlet box 3, after the sampling gas in the air inlet box 1 and the air outlet box 3 is replaced, the ball valve 29 is closed, the connected air pump is disconnected, and the flow control valve 9 is closed; when in detection, the box body air outlet pipeline 8 and the box body air inlet pipeline 7 are connected with a detection instrument, the heating sleeve 4 outside the sampling pipe 5 is appointed to work for heating the box body air outlet pipeline and the box body air inlet pipeline, volatile organic matters in the sampling pipe 5 begin to volatilize, the electromagnetic control valves 24 corresponding to the two ends of the sampling pipe 5 are opened, the volatile organic matters in the sampling pipe 5 are separated from the absorption filler and are discharged from the air outlet pipeline, and the air supplementing can be carried out in the box body air inlet pipeline 7 to help the volatilized volatile organic matters to be discharged, so that the detection is completed; after the detection is finished, the box body air outlet pipeline 8 and the box body air inlet pipeline 7 are separated from the detection instrument, then cleaning and purging work can be carried out, all the heating sleeves 4 can be started to heat all the sampling pipes 5, the electromagnetic control valve 24 on the nitrogen tank 6 is opened, and nitrogen purging is carried out, so that all volatile organic matters in the sampling pipes 5 are purged and discharged.
The above examples are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and adaptations of the technical solution of the present invention should and are intended to fall within the scope of the present invention as defined in the claims.
Claims (10)
1. A volatile organic compound sampling device which is characterized in that: the device comprises a preservation box body, a pretreatment box body and an exhaust pipe, wherein the preservation box body, the pretreatment box body and the exhaust pipe are sequentially communicated, the preservation box body comprises an air inlet box, a sampling box and an air outlet box, the sampling box and the air inlet box are sequentially stacked and detachably mounted and fixed, a plurality of heating sleeves are arranged in the sampling box, corresponding sampling pipes are arranged in the heating sleeves, a nitrogen tank is further arranged in the sampling box, the nitrogen tank is communicated with the air inlet box, an air inlet conveying channel and an air outlet conveying channel which are correspondingly and hermetically matched with two ends of the sampling pipes are respectively arranged in the air inlet box and the air outlet box, each sampling pipe is tightly fixed through the air outlet box and the air inlet box, electromagnetic control valves which are convenient to open or close are respectively arranged on the air inlet box, the air outlet box and the sampling box are identical in structure, a lock catch structure is arranged between the air inlet box and the sampling box, a box air inlet pipeline which is convenient to air inlet is arranged in the sampling box, an air outlet pipeline is arranged on the air outlet box, an air inlet pipeline which is convenient to air outlet pipeline is arranged on the air outlet box, the air inlet pipeline is arranged on the air inlet pipeline is fast, and the air inlet pipeline is arranged on the air inlet pipeline, and the air inlet pipeline is arranged on the air inlet pipeline is fast, and the air inlet pipeline is arranged on the air inlet pipeline; the box body air inlet pipe is communicated with a pretreatment box body for carrying out sampling pretreatment on sampling gas through a quick-insertion structure, and the pretreatment box body is connected with a copper exhaust pipe through the quick-insertion structure; and a replacement connecting pipeline with a valve is also connected between the air inlet box and the air outlet box.
2. A volatile organic compound sampling device as defined in claim 1, wherein: the pretreatment box comprises a pretreatment box body, and is characterized in that an air inlet and an air outlet are formed in the pretreatment box body, a box body air inlet pipeline and a box body air outlet pipeline are arranged at the air inlet and the air outlet, the box body air inlet pipeline is communicated with the box body air outlet pipeline through a quick-insertion structure, pretreatment valves which are convenient to open and close are arranged on the box body air inlet pipeline and the box body air outlet pipeline, the ends of the box body air inlet pipeline and the box body air outlet pipeline are of a quick-insertion structure, a pretreatment pipe communicated with the air inlet and the air outlet is formed in the pretreatment box body, the pretreatment pipe comprises a heating part and a condensing part, the heating part is located at the upstream of the condensing part, a condensate collecting port is formed in the lower position of the condensing part, and a condensate collecting bottle which is convenient to disassemble is arranged at the condensate collecting port, and an exhaust pipe is connected to the air outlet pipeline through the quick-insertion structure.
3. A volatile organic compound sampling device as defined in claim 2, wherein: the air inlet box comprises an air inlet chamber, a plurality of air inlet conveying holes are formed in the air inlet chamber, each air inlet conveying hole is communicated with the air inlet conveying channel in a one-to-one correspondence manner, an upper guide chute for compacting the sealed sampling tube is formed in the lower end part of the air inlet conveying channel, and an air inlet pipeline of the box body is communicated with the air inlet chamber; the box of giving vent to anger includes the cavity of giving vent to anger, set up a plurality of delivery pores of giving vent to anger in the cavity of giving vent to anger, each delivery pore of giving vent to anger with the delivery channel one-to-one intercommunication gives vent to anger, the lower direction chute that compresses tightly sealed sampling tube has been seted up to the upper end of delivery channel of giving vent to anger, the box air outlet pipe is put through with the cavity of giving vent to anger.
4. A volatile organic compound sampling device as defined in claim 3, wherein: the nitrogen tank is provided with a purging pipeline extending into the air inlet chamber, and the purging pipeline is also provided with a quick-insertion structure which is convenient to disassemble and assemble; elastic washers which are in contact with the sampling tube are arranged on the upper guide chute and the lower guide chute.
5. A volatile organic compound sampling device as defined in claim 4, wherein: the pretreatment pipe is a U-shaped pipe, the heating part comprises a heating pipe section which is positioned on the U-shaped pipe and communicated with the air inlet, a heating wire is arranged on the heating pipe section, the condensing part comprises a condensing pipe section which is communicated with the downstream of the heating pipe section, a condensing device for actively cooling is arranged on the condensing pipe section, an exhaust pipe section is communicated with the downstream of the condensing pipe section, and the exhaust pipe section is communicated with the air outlet.
6. A volatile organic compound sampling device as defined in claim 5, wherein: the condensing pipe section comprises a first pipe section and a second pipe section, the position of the first pipe section is higher than that of the second pipe section, the first pipe section and the second pipe section are communicated through a guide pipe section, and condensing devices are arranged on the first pipe section, the second pipe section and the guide pipe section.
7. A volatile organic compound sampling device as defined in claim 6, wherein: the first pipe section and the second pipe section are vertically installed, the condensate collecting port is arranged at the bottom of the second pipe section, and the condensate collecting port and the condensate collecting bottle are fixedly connected through threads.
8. A volatile organic compound sampling device as defined in claim 5, wherein: the diameter of the heating pipe section is smaller than that of the condensing pipe section.
9. A volatile organic compound sampling device as defined in claim 7, wherein: the inner wall of the exhaust tube is covered with an inert coating through inert treatment.
10. A volatile organic compound sampling device as defined in claim 1, wherein: the handle convenient to grasp is rotatably arranged on the air inlet box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310679539.3A CN116577158A (en) | 2023-06-09 | 2023-06-09 | Volatile organic compound sampling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310679539.3A CN116577158A (en) | 2023-06-09 | 2023-06-09 | Volatile organic compound sampling device |
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| CN116577158A true CN116577158A (en) | 2023-08-11 |
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| CN202310679539.3A Pending CN116577158A (en) | 2023-06-09 | 2023-06-09 | Volatile organic compound sampling device |
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| CN (1) | CN116577158A (en) |
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- 2023-06-09 CN CN202310679539.3A patent/CN116577158A/en active Pending
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