CN114414748B - Volatile organic compound content detection device and method - Google Patents
Volatile organic compound content detection device and method Download PDFInfo
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- CN114414748B CN114414748B CN202210292082.6A CN202210292082A CN114414748B CN 114414748 B CN114414748 B CN 114414748B CN 202210292082 A CN202210292082 A CN 202210292082A CN 114414748 B CN114414748 B CN 114414748B
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- 238000001514 detection method Methods 0.000 title claims abstract description 100
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 16
- 238000011010 flushing procedure Methods 0.000 claims abstract description 100
- 239000007789 gas Substances 0.000 claims abstract description 75
- 238000007789 sealing Methods 0.000 claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000428 dust Substances 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 5
- 238000003915 air pollution Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0029—Cleaning of the detector
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Abstract
The invention discloses a volatile organic compound content detection device and a volatile organic compound content detection method, and the volatile organic compound content detection device comprises a detection device body and a washing tank, wherein an air inlet cylinder is arranged on the upper surface of the detection device body, first washing holes are equidistantly formed in one side, close to the air inlet cylinder, of the detection device body, an air inlet assembly is arranged in the detection device body at the lower end of the air inlet cylinder, the upper end of the air inlet assembly is fixedly connected with the lower end of the air inlet cylinder, and a sealing ring is arranged at the lower end of the air inlet cylinder. According to the device and the method for detecting the content of the volatile organic compounds, the air inlet pipes are arranged on the air inlet cylinder in a step-shaped distribution mode, gas with different heights can be collected, the uniformity of the collected gas can be detected, the flushing pipe and the flushing tank are connected through the hose, the used detection device body and the air inlet cylinder are flushed by high-pressure nitrogen, the windmill assembly is driven to work by wind power, the dust screen is automatically cleaned, the residual of the detected gas is prevented, and the detection precision is improved.
Description
Technical Field
The invention relates to the technical field of volatile organic compound detection, in particular to a device and a method for detecting the content of volatile organic compounds.
Background
Volatile organic compounds, commonly denoted by VOCs, in China, VOCs refer to organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point of 260 ℃ below under normal pressure, or all volatile organic compounds with vapor pressure of more than or equal to 10Pa at 20 DEG COrganic compounds, Volatile Organic Compounds (VOCs) are formed into fine particulate matter (PM 2.5), ozone (O)3) And the important precursors of secondary pollutants, and further causes atmospheric environmental problems such as dust haze, photochemical smog and the like. With the rapid development of industrialization and urbanization in China and the continuous increase of energy consumption, PM2.5 and O are used3The regional composite air pollution is characterized by increasingly prominent regional composite air pollution, the frequency of the phenomenon of heavy air pollution in the region is increased in a large range, the sustainable development of social economy is seriously restricted, and the health of people is threatened.
Chinese patent CN112684104A discloses a volatile organic compound detection device in atmosphere, including volatile organic compound detection system, fan and filter, detection system's air intake passes through the pipeline and communicates with fan and filter in proper order, still is provided with the air outlet on the detection system, and the filter only can filter the large granule material in the air. When the air environment is detected, the air collecting pipes with certain lengths can be used for sucking air in different heights and directions for mixed detection, and the problem of inaccurate detection data caused by air flow and impurities can be reduced to the maximum extent by arranging the filter; a standby power supply is arranged, so that the problem that the detection cannot be carried out under the condition of power failure and outage is avoided; the wireless module and the USB interface are arranged to transmit and backup the detection data in time.
Although this application solves the problems in the background art to some extent, the following problems exist in this application: 1. a cleaning device is not arranged in the organic matter detection device, volatile organic matters cannot be cleaned after detection is finished, gas residue is easy to occur, and detection data are inaccurate; 2. after the filter is blocked by particles, the filter is not easy to clean, and gas is influenced to enter the detection device.
Disclosure of Invention
The invention aims to provide a volatile organic compound content detection device and method.A gas inlet pipe is arranged on a gas inlet cylinder and is distributed in a step shape, so that gases with different heights can be collected, and the uniformity of the detected and collected gases is ensured; the air inlet cylinder is internally provided with a collecting channel, the collecting channel is internally provided with a flushing pipe, the flushing pipe is controlled by the transmission assembly to move up and down to drive the piston to move, and the detection gas is collected into the detection device body by utilizing the change of pressure intensity, so that the structure is simple and easy to realize; the air inlet assembly is used for exhausting air, the coiled pipe is in a coiled state under the condition that the coiled pipe is not stressed, the tail end of the coiled pipe is sealed, the detection gas cannot overflow from the coiled pipe, and after the gas is flushed into the coiled pipe, the coiled pipe is straightened, the auxiliary gas passes through the coiled pipe, and the coiled pipe is convenient to use; in addition, the hose is connected with the flushing pipe and the flushing tank, the used detection device body and the used air inlet cylinder are flushed by high-pressure nitrogen, the windmill assembly is driven to work by wind power, the dustproof net is automatically cleaned, the residual detection gas is prevented, the detection precision is improved, and the problems in the background art are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a volatile organic compound content detection device comprises a detection device body and a flushing tank, wherein an air inlet cylinder is arranged on the upper surface of the detection device body, first flushing holes are equidistantly formed in one side, close to the air inlet cylinder, of the detection device body, an air inlet assembly is arranged in the detection device body at the lower end of the air inlet cylinder, the upper end of the air inlet assembly is fixedly connected with the lower end of the air inlet cylinder, a sealing ring is arranged at the lower end of the air inlet cylinder, air inlet pipelines are equidistantly formed in the upper surface of the air inlet cylinder, a transmission assembly is arranged at the central position of the upper surface of the air inlet cylinder, a flushing pipe is movably connected onto the transmission assembly, one end of the flushing pipe extends into the detection device body, the upper end of the flushing pipe is connected with the flushing tank through a hose, a collection channel is arranged at the joint of the air inlet cylinder and the flushing pipe, and a piston is arranged at the position, which is arranged in the collection channel, the piston is attached to the inside of the collecting channel.
Further, the air inlet assembly comprises a straight pipe, an inclined pipe and a reel pipe, the upper end of the straight pipe is fixedly connected with the lower end of the air inlet cylinder, the inclined pipe is arranged at the lower end of the straight pipe at equal intervals, the lower end of the inclined pipe is fixedly connected with one end of the reel pipe, and the reel pipe is of a plastic hose structure.
Furthermore, the number of the inclined pipes is four, and one end of each inclined pipe, which is far away from the straight pipe, inclines downwards and inclines towards the directions of the four corners of the detection device body.
Furthermore, an air inlet branch passage is arranged inside the air inlet cylinder, the lower end of the air inlet branch passage is in an open design, an air outlet is formed in one side, close to the collecting channel, of the air inlet branch passage, a one-way valve is hinged to the air outlet, and the upper end of the air inlet branch passage is fixedly connected with the lower end of the air inlet pipeline.
Further, three are no less than to the quantity of admission line, and every admission line's length is different, is the echelonment and distributes, and the upper end of admission line is provided with the dust screen, and the admission line is provided with the wind car subassembly in arranging in the position of dust screen inner circle.
Furthermore, the windmill component comprises a rotating shaft and a fan-moving plate, the upper end of the rotating shaft is movably connected with the air inlet pipeline, the fan-moving plate is arranged in the periphery of the rotating shaft at equal intervals, the fan-moving plate is obliquely arranged, the tail end of the fan-moving plate is provided with bristles, and the bristles are attached to the inner wall of the dustproof screen.
Furthermore, the transmission assembly comprises a worm wheel ring, a driving motor and a worm, the output end of the driving motor is fixedly connected with the worm, the worm is meshed with the upper end of the worm wheel ring, a sliding ring is arranged on the outer wall of the worm wheel ring and movably connected with the detection device body, an internal thread is arranged on the inner wall of the worm wheel ring, and the internal thread is meshed with the flushing pipe.
Furthermore, a fixing ring is arranged at the upper end of the flushing pipe, one end of the fixing ring is fixedly connected with a limiting rod, one end of the limiting rod is provided with a guide rod, the lower end of the guide rod is fixedly connected with the upper surface of the air inlet cylinder, the lower end of the flushing pipe penetrates through the piston, and the lower end of the flushing pipe is provided with a one-way valve.
Further, the inner ring of the sealing ring is provided with a sealing plate, the sealing plate is clamped with the lower end of the air inlet cylinder, a second flushing hole is formed in the sealing plate and matched with the first flushing hole, the second flushing hole corresponds to the air inlet branch channel, balls are arranged on the inner ring of the sealing plate, an arc-shaped long waist groove is formed in one side of the sealing ring, a handle is arranged at one end of the arc-shaped long waist groove, a limiting column matched with the arc-shaped long waist groove is arranged on the upper surface of the detection device body, and the limiting column is clamped with one end of the arc-shaped long waist groove.
Another technical problem to be solved by the present invention is to provide a method for using a device for detecting a content of a volatile organic compound, comprising the following steps:
s1: the sealing plate blocks and blocks the communication between the first flushing hole and the air inlet branch passage, the transmission assembly drives the flushing pipe to ascend, so that the piston moves upwards, negative pressure is generated in the collecting channel, the one-way valve is opened towards one side of the collecting channel, the air inlet branch passage also generates negative pressure, and gas to be detected enters the air inlet pipeline;
s2: when the gas to be detected passes through the dust screen, the particles in the gas are filtered out through filtering, the piston moves to the uppermost end, the gas sucked into the collecting channel is sucked into the collecting channel, and the transmission assembly drives the flushing pipe to move downwards;
s3: the one-way valve is closed, the gas to be detected is pushed into the gas inlet assembly by the piston, the coiled pipe is straightened, the auxiliary gas passes through the coiled pipe, the gas is guided to the directions of the four corners of the detection device body, the transmission assembly works in a reciprocating mode, and the gas to be detected is collected;
s4: the detection device body detects the gas, and after the detection is finished, the content of the volatile organic compounds is displayed through the display screen;
s5: the sealing ring can be driven to integrally rotate through the handle, so that the second flushing hole corresponds to the first flushing hole in position, the air inlet branch channel is communicated with the first flushing hole, high-pressure nitrogen in the flushing tank is introduced into the detection device body, the coiled pipe is straightened, auxiliary gas passes through the coiled pipe, the gas is guided to the directions of the four corners of the detection device body, the detection device body is flushed away, and the gas is discharged through the first flushing hole, the second flushing hole and the air inlet branch channel;
s6: the high-pressure nitrogen drives the fan-moving plate in the air inlet pipeline to rotate, so that the dust screen is cleaned by the bristles.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the device and the method for detecting the content of the volatile organic compounds, the gas inlet pipes are arranged on the gas inlet cylinder in a step-shaped distribution mode, so that gases with different heights can be collected, and the uniformity of the collected gases is guaranteed to be detected;
2. according to the device and the method for detecting the content of the volatile organic compounds, the collecting channel is arranged in the air inlet cylinder, the flushing pipe is arranged in the collecting channel, the flushing pipe is controlled to move up and down through the transmission assembly to drive the piston to move, the detection gas is collected into the detection device body by utilizing the change of the pressure intensity, and the device and the method are simple in structure and easy to realize;
3. according to the device and the method for detecting the content of the volatile organic compounds, the air inlet assembly is adopted for exhausting air, the coiled pipe is in a coiled state under the condition that the coiled pipe is not stressed, the tail end of the coiled pipe is sealed, the detection gas cannot overflow from the coiled pipe, and after the gas is flushed into the coiled pipe, the coiled pipe is straightened, the auxiliary gas passes through the coiled pipe, and the device and the method are convenient to use;
4. according to the device and the method for detecting the content of the volatile organic compounds, the flushing pipe and the flushing tank are connected through the hose, the used detection device body and the used air inlet cylinder are flushed by high-pressure nitrogen, the windmill assembly is driven to work by wind power, the dust screen is automatically cleaned, the detection gas is prevented from being left, and the detection precision is improved.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a sectional view of the detecting unit according to the present invention;
FIG. 3 is a view of the connection of the intake manifold of the present invention;
FIG. 4 is a block diagram of the intake barrel of the present invention;
FIG. 5 is a partial block diagram of the intake manifold of the present invention;
FIG. 6 is an exploded view of the drive assembly and washpipe of the present invention;
fig. 7 is a view showing a seal ring structure of the present invention.
In the figure: 1. a detection device body; 11. a first flushing port; 12. an air intake assembly; 121. a straight pipe; 122. an inclined tube; 123. pipe coiling; 2. washing the tank; 3. an air inlet cylinder; 31. an air intake duct; 311. a dust screen; 312. a windmill assembly; 3121. a rotating shaft; 3122. a fan moving plate; 31221. brushing; 32. a transmission assembly; 321. a worm-gear rim; 3211. a sliding ring; 322. a drive motor; 323. a worm; 33. a flushing pipe; 331. a piston; 332. a fixing ring; 333. a limiting rod; 34. a collection channel; 35. an air intake branch passage; 351. an air outlet; 352. a one-way valve; 36. a guide bar; 4. a seal ring; 41. a sealing plate; 411. a second flushing port; 412. a ball bearing; 42. an arc-shaped long waist groove; 421. a handle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a volatile organic compound content detection device includes a detection device body 1 and a flushing tank 2, high-pressure nitrogen is disposed in the flushing tank 2, an air inlet cylinder 3 is disposed on an upper surface of the detection device body 1, first flushing holes 11 are disposed on one side of the detection device body 1 close to the air inlet cylinder 3 at equal intervals, an air inlet assembly 12 is disposed in the detection device body 1 at a lower end of the air inlet cylinder 3, an upper end of the air inlet assembly 12 is fixedly connected with a lower end of the air inlet cylinder 3, the air inlet assembly 12 includes a straight pipe 121, an inclined pipe 122 and a rolling pipe 123, the upper end of the straight pipe 121 is fixedly connected with the lower end of the air inlet cylinder 3, the lower end of the straight pipe 121 is provided with the inclined pipe 122 at equal intervals, the lower end of the inclined pipe 122 is fixedly connected with one end of the rolling pipe 123, the rolling pipe 123 is a plastic hose structure, the number of the inclined pipes 122 is four, and one end of the inclined pipe 122 far away from the straight pipe 121 is inclined downwards, and incline towards the four corners direction of detection device body 1, and under the condition that does not receive the force, reelpipe 123 is the state of curling, and the terminal of reelpipe 123 is sealed, and the testing gas can not spill over from reelpipe 123, after dashing into gas in reelpipe 123, reelpipe 123 is propped straight, and the auxiliary gas passes through to with the four corners direction of gas direction detection device body 1, gaseous striking behind the bottom four corners of detection device body 1, can be full of detection device body 1 from the bottom.
Referring to fig. 3-6, the lower end of the air inlet cylinder 3 is provided with a sealing ring 4, the upper surface of the air inlet cylinder 3 is provided with air inlet ducts 31 at equal intervals, the number of the air inlet ducts 31 is not less than three, each air inlet duct 31 has a different length and is distributed in a step shape, and can collect air at different heights, so as to ensure uniformity of the collected air, the upper end of the air inlet duct 31 is provided with a dust screen 311, the air inlet duct 31 is provided with a windmill assembly 312 at the inner ring of the dust screen 311, the windmill assembly 312 comprises a rotating shaft 3121 and a fanning plate 3122, the upper end of the rotating shaft 3121 is movably connected with the air inlet duct 31, the fanning plate 3122 is arranged at equal intervals around the rotating shaft 3121, the fanning plate 3122 is arranged obliquely, the end of the fanning plate 3122 is provided with bristles 31221, the bristles 31221 are attached to the inner wall of the dust screen 311, and a certain resistance is provided at the connection between the rotating shaft 3121 and the air inlet duct 31, when collecting gas, the negative pressure in the air inlet pipe 31 is not enough to drive the fan plate 3122 to rotate, when cleaning the device, the high-pressure nitrogen gas drives the fan plate 3122 to rotate, so that the brush bristles 31221 clean the dust screen 311, the center position of the upper surface of the air inlet cylinder 3 is provided with the transmission component 32, the transmission component 32 is movably connected with the flushing pipe 33, the transmission component 32 comprises a worm wheel ring 321, a driving motor 322 and a worm 323, the output end of the driving motor 322 is fixedly connected with the worm 323, the worm 323 is meshed with the upper end of the worm wheel ring 321, the outer wall of the worm wheel ring 321 is provided with the sliding ring 3211, the sliding ring 3211 is movably connected with the detection device body 1, the inner wall of the worm wheel ring 321 is provided with an internal thread, the internal thread is meshed with the flushing pipe 33, one end of the flushing pipe 33 extends to the inside of the detection device body 1, the upper end of the flushing pipe 33 is connected with the flushing tank 2 through a hose, the upper end of the flushing pipe 33 is provided with a fixing ring 332, one end of the fixing ring 332 is fixedly connected with a limiting rod 333, one end of the limiting rod 333 is provided with a guide rod 36, the lower end of the guide rod 36 is fixedly connected with the upper surface of the air inlet cylinder 3, the guide rod 36 limits the moving path of the flushing pipe 33 and ensures that the flushing pipe 33 can only move up and down, the lower end of the flushing pipe 33 penetrates through the piston 331, the lower end of the flushing pipe 33 is provided with a one-way valve which prevents the detection gas from overflowing from the flushing pipe 33, so that the high-pressure nitrogen gas can only move in one way, the connecting part of the air inlet cylinder 3 and the flushing pipe 33 is provided with a collecting channel 34, the position of the flushing pipe 33 arranged in the collecting channel 34 is provided with the piston 331, the piston 331 is attached to the inside of the collecting channel 34, the inside of the air inlet cylinder 3 is provided with an air inlet branch channel 35, the lower end of the air inlet branch channel 35 is of an open design, one side of the air inlet branch channel 35 close to the collecting channel 34 is provided with an air outlet 351, the air outlet 351 is hinged with a one-way valve 352, the upper end of the air inlet branch passage 35 is fixedly connected with the lower end of the air inlet pipeline 31, the one-way valve 352 can only be opened towards the collecting channel 34, when the flushing pipe 33 drives the piston 331 to move upwards, negative pressure is generated in the collecting channel 34, the one-way valve 352 is opened towards one side of the collecting channel 34, and the air to be detected enters the air inlet pipeline 31.
Referring to fig. 7, a sealing plate 41 is disposed on an inner ring of a sealing ring 4, the sealing plate 41 is engaged with a lower end of an intake cylinder 3, a second flushing hole 411 is disposed on the sealing plate 41, the second flushing hole 411 is matched with a first flushing hole 11, the second flushing hole 411 corresponds to an intake branch passage 35, a ball 412 is disposed on the inner ring of the sealing plate 41, an arc-shaped long waist groove 42 is disposed on one side of the sealing ring 4, a handle 421 is disposed at one end of the arc-shaped long waist groove 42, a limit post matched with the arc-shaped long waist groove 42 is disposed on an upper surface of a detection device body 1, the limit post is engaged with one end of the arc-shaped long waist groove 42, the sealing ring 4 can be driven to rotate integrally by the handle 421, the second flushing hole 411 corresponds to the first flushing hole 11, so as to communicate the intake branch passage 35 with the first flushing hole 11, high-pressure nitrogen can be discharged from the first flushing hole 11, the second flushing hole 411 and the intake branch passage 35, when the second flushing hole 411 and the first flushing hole 11 are dislocated, the sealing plate 41 blocks and blocks the communication between the first flushing hole 11 and the air inlet branch passage 35, so that the gas to be detected in the detection device body 1 cannot overflow, and the arc-shaped long waist groove 42 limits the rotation angle of the sealing ring 4.
In order to better show the detection process of the volatile organic compound content detection device, the embodiment now provides a method for using the volatile organic compound content detection device, which includes the following steps:
the method comprises the following steps: the sealing plate 41 blocks and blocks the communication between the first flushing hole 11 and the air inlet branch passage 35, the transmission assembly 32 drives the flushing pipe 33 to ascend, so that the piston 331 moves upwards, negative pressure is generated in the collecting passage 34, the one-way valve 352 is opened towards one side of the collecting passage 34, the air inlet branch passage 35 also generates negative pressure, and gas to be detected enters the air inlet pipeline 31;
step two: when the gas to be detected passes through the dust screen 311, the particles in the gas are filtered, the piston 331 moves to the uppermost end, the gas sucked into the collecting channel 34 exists in the sucking collecting channel 34, and the transmission component 32 drives the flushing pipe 33 to move downwards;
step three: the check valve 352 is closed, the gas to be detected is pushed into the gas inlet assembly 12 by the piston 331, the coiled pipe 123 is straightened, the auxiliary gas passes through the coiled pipe and is guided to the four corners of the detection device body 1, the transmission assembly 32 works in a reciprocating manner to collect the gas to be detected, and the detection device body 1 can be filled from the bottom after the gas impacts the four corners of the bottom of the detection device body 1;
step four: the detection device body 1 detects gas, and after detection is finished, the content of volatile organic compounds is displayed through a display screen;
step five: the handle 421 can drive the sealing ring 4 to rotate integrally, so that the second flushing hole 411 corresponds to the first flushing hole 11, the air inlet branch passage 35 is communicated with the first flushing hole 11, high-pressure nitrogen in the flushing tank 2 is introduced into the detection device body 1, the coiled pipe 123 is straightened, auxiliary gas passes through, the gas is guided to the four corners of the detection device body 1, the detection device body 1 is flushed away, and the gas is discharged through the first flushing hole 11, the second flushing hole 411 and the air inlet branch passage 35;
step six: the high-pressure nitrogen gas drives the fan-moving plate 3122 in the air inlet duct 31 to rotate, so that the bristles 31221 clean the dust screen 311.
In summary, the following steps: according to the volatile organic compound content detection device and method, the air inlet pipes 31 distributed in a step shape are arranged on the air inlet cylinder 3, so that gases with different heights can be collected, and the uniformity of the detected and collected gases is ensured; the air inlet cylinder 3 is internally provided with a collecting channel 34, the washing pipe 33 is arranged in the collecting channel 34, the washing pipe 33 is controlled by the transmission assembly 32 to move up and down to drive the piston 331 to move, and the detection gas is collected into the detection device body 1 by utilizing the change of pressure intensity, so that the structure is simple and easy to realize; the air inlet assembly 12 is used for exhausting air, the roller pipe 123 is in a curling state under the condition that the roller pipe 123 is not stressed, the tail end of the roller pipe 123 is sealed, the detection gas cannot overflow from the roller pipe 123, and after the gas is flushed into the roller pipe 123, the roller pipe 123 is straightened, the auxiliary gas passes through, and the use is convenient; in addition, the flushing pipe 33 and the flushing tank 2 are connected through a hose, the used detection device body 1 and the used air inlet cylinder 3 are flushed by high-pressure nitrogen, the windmill assembly 312 is driven by wind power to work, the dust screen 311 is automatically cleaned, the detection gas is prevented from remaining, and the detection precision is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. The utility model provides a volatile organic compounds content testing device, includes detection device body (1) and washes jar (2), its characterized in that: the upper surface of the detection device body (1) is provided with an air inlet cylinder (3), one side of the detection device body (1) close to the air inlet cylinder (3) is provided with first flushing holes (11) at equal intervals, an air inlet assembly (12) is arranged in the detection device body (1) at the lower end of the air inlet cylinder (3), the air inlet assembly (12) comprises a straight pipe (121), inclined pipes (122) and a reel pipe (123), the upper end of the straight pipe (121) is fixedly connected with the lower end of the air inlet cylinder (3), the lower end of the straight pipe (121) is provided with the inclined pipes (122) at equal intervals, the number of the inclined pipes (122) is four, one end, far away from the straight pipe (121), of each inclined pipe (122) inclines downwards and inclines towards the directions of four corners of the detection device body (1), the lower end of each inclined pipe (122) is fixedly connected with one end of the reel pipe (123), the reel pipe (123) is of a plastic hose structure, the upper end of the air inlet assembly (12) is fixedly connected with the lower end of the air inlet cylinder (3),
the lower end of the air inlet cylinder (3) is provided with a sealing ring (4), the upper surface of the air inlet cylinder (3) is provided with air inlet pipelines (31) at equal intervals, the air inlet pipelines (31) are arranged at the inner ring position of the dust screen (311) and provided with windmill assemblies (312), each windmill assembly (312) comprises a rotating shaft (3121) and a fan-shaped plate (3122), the upper end of the rotating shaft (3121) is movably connected with the air inlet pipelines (31), the fan-shaped plates (3122) are arranged at equal intervals around the rotating shaft (3121), the fan-shaped plates (3122) are obliquely arranged, the tail ends of the fan-shaped plates (3122) are provided with bristles (31221), the bristles (31221) are attached to the inner wall of the dust screen (311), the center position of the upper surface of the air inlet cylinder (3) is provided with a transmission assembly (32), the transmission assembly (32) is movably connected with a flushing pipe (33), one end of the flushing pipe (33) extends to the interior of the detection device body (1), the upper end of the flushing pipe (33) is connected with the flushing tank (2) through a hose, a collecting channel (34) is arranged at the joint of the air inlet cylinder (3) and the flushing pipe (33), a piston (331) is arranged at the position of the flushing pipe (33) arranged in the collecting channel (34), the piston (331) is attached to the inside of the collecting channel (34),
the inner ring of sealing ring (4) is provided with a sealing plate (41), the sealing plate (41) is clamped with the lower end of an air inlet cylinder (3), a second flushing hole (411) is formed in the sealing plate (41), the second flushing hole (411) is matched with a first flushing hole (11), the second flushing hole (411) corresponds to the position of an air inlet branch passage (35), balls (412) are arranged on the inner ring of the sealing plate (41), an arc-shaped long waist groove (42) is formed in one side of the sealing ring (4), a handle (421) is arranged at one end of the arc-shaped long waist groove (42), a limiting column matched with the arc-shaped long waist groove (42) is arranged on the upper surface of the detection device body (1), and the limiting column is clamped with one end of the arc-shaped long waist groove (42).
2. The apparatus for detecting the content of volatile organic compounds according to claim 1, wherein: the air inlet branch passage (35) is arranged inside the air inlet cylinder (3), the lower end of the air inlet branch passage (35) is open, an air outlet (351) is formed in one side, close to the collecting channel (34), of the air inlet branch passage (35), a one-way valve (352) is hinged to the air outlet (351), and the upper end of the air inlet branch passage (35) is fixedly connected with the lower end of the air inlet pipeline (31).
3. The apparatus for detecting the content of volatile organic compounds according to claim 2, wherein: the number of the air inlet pipes (31) is not less than three, the length of each air inlet pipe (31) is different and is distributed in a step shape, and the upper end of each air inlet pipe (31) is provided with a dust screen (311).
4. The apparatus for detecting the content of volatile organic compounds according to claim 1, wherein: the transmission assembly (32) comprises a worm wheel ring (321), a driving motor (322) and a worm (323), the output end of the driving motor (322) is fixedly connected with the worm (323), the worm (323) is meshed with the upper end of the worm wheel ring (321), a sliding ring (3211) is arranged on the outer wall of the worm wheel ring (321), the sliding ring (3211) is movably connected with the detection device body (1), an internal thread is arranged on the inner wall of the worm wheel ring (321), and the internal thread is meshed with the flushing pipe (33).
5. The apparatus according to claim 4, wherein: the upper end of the flushing pipe (33) is provided with a fixing ring (332), one end of the fixing ring (332) is fixedly connected with a limiting rod (333), one end of the limiting rod (333) is provided with a guide rod (36), the lower end of the guide rod (36) is fixedly connected with the upper surface of the air inlet cylinder (3), the lower end of the flushing pipe (33) penetrates through the piston (331), and the lower end of the flushing pipe (33) is provided with a one-way valve.
6. The detection method of the apparatus for detecting the content of volatile organic compounds according to any one of claims 1 to 5, comprising the steps of:
s1: the sealing plate (41) blocks and blocks the communication between the first flushing hole (11) and the air inlet branch passage (35), the transmission assembly (32) drives the flushing pipe (33) to ascend, so that the piston (331) moves upwards, negative pressure is generated in the collecting passage (34), the one-way valve (352) is opened towards one side of the collecting passage (34), the air inlet branch passage (35) also generates negative pressure, and gas to be detected enters the air inlet pipeline (31);
s2: when the gas to be detected passes through the dust screen (311), particulate matters in the gas are filtered out through filtering, the piston (331) moves to the uppermost end, the gas sucked into the collecting channel (34) is sucked into the collecting channel (34), and the transmission assembly (32) drives the flushing pipe (33) to move downwards;
s3: the one-way valve (352) is closed, gas to be detected is pushed into the gas inlet assembly (12) by the piston (331), the coiled pipe (123) is straightened, auxiliary gas passes through the coiled pipe, the gas is guided to the four corners of the detection device body (1), the transmission assembly (32) works in a reciprocating mode, and the gas to be detected is collected;
s4: the detection device body (1) detects gas, and after detection is finished, the content of volatile organic compounds is displayed through a display screen;
s5: the sealing ring (4) can be driven to integrally rotate through the handle (421), so that the second flushing hole (411) corresponds to the first flushing hole (11), the air inlet branch channel (35) is communicated with the first flushing hole (11), high-pressure nitrogen in the flushing tank (2) is introduced into the detection device body (1), the coiled pipe (123) is straightened, auxiliary gas passes through the coiled pipe, the gas is guided to the four corners of the detection device body (1), the detection device body (1) is flushed away, and the coiled pipe is discharged through the first flushing hole (11), the second flushing hole (411) and the air inlet branch channel (35);
s6: the high-pressure nitrogen drives the fan moving plate (3122) in the air inlet pipeline (31) to rotate, so that the bristles (31221) clean the dust screen (311).
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| CN118067925B (en) * | 2024-02-26 | 2024-09-03 | 青岛市计量技术研究院 | Detection device capable of detecting different gases |
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