A multi-point in-situ detection device for nitrite and nitric oxide

Abstract

The invention relates to the technical field of air detection, and in particular to a multi-point in-situ detection device for nitrous acid and nitric oxide, comprising a shunt collection pipeline, a multi-section extractor, an air suction pump, a cleaning circulation pipeline and a circulation cleaning device; the shunt collection pipeline is installed in a collection area, and the shunt collection pipeline is provided with a plurality of collection ends distributed in different collection areas; the multi-section extractor is installed at the output end of the shunt collection pipeline, the interior of the multi-section extractor is connected with a nitrous acid detector and a nitric oxide detector, the air suction pump is connected with the shunt collection pipeline, and the air suction pump is used to suck the gas inside the shunt collection pipeline; the cleaning circulation pipeline is installed above the shunt collection pipeline, and the cleaning circulation pipeline is provided with a plurality of liquid outlet ends, and the liquid outlet end of the cleaning circulation pipeline is connected with the shunt collection pipeline; the input end of the circulation cleaning device is connected with the shunt collection pipeline, and the output end of the circulation cleaning device is connected with the cleaning circulation pipeline. The invention can effectively improve the detection efficiency and reduce the detection cost at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of air detection, and in particular to a multi-point in-situ detection device for nitrous acid and nitric oxide. Background Art

[0002] The air environment contains nitrite and nitric oxide. High concentrations of nitrite and nitric oxide are harmful to human health, mainly in the respiratory system, cardiovascular system and immune system, posing a threat to human health and the environment.

[0003] Chinese patent number CN220525782U discloses a precise detection device for nitric oxide, including a detection tank, a filter screen fixedly connected to the inner wall of the detection tank, a nitric oxide detector fixedly connected to the inner wall of the detection tank, an exhaust hole penetrated through the surface of the detection tank, and a fan fixedly connected to the inner wall of the detection tank. When the fan is started, external air is sucked into the detection tank through an air duct, a connecting pipe and a telescopic air intake mechanism. The air is filtered by the filter screen and then detected by the nitric oxide detector and then discharged through the exhaust hole. When the moving mechanism is started, the telescopic air intake component is stretched to adjust the suction distance. When the rotating component is started, the limit support mechanism, the connecting pipe, the moving mechanism and the telescopic air intake component are rotated to adjust the air suction direction, thereby achieving the goal of facilitating the suction detection of air in different directions and avoiding the problem that the detection range of the existing nitric oxide detector is limited, resulting in difficulty in timely alarm and response when nitric oxide leaks.

[0004] Existing air detection generally involves sucking air for detection as described in the above-mentioned device. However, when detecting the outdoor area environment, since there will be multiple collection points in the observation area, each time the detection is performed, the detection equipment must be manually moved to each collection point for air collection and detection, which will greatly waste manpower. Alternatively, multiple devices must be placed at each collection point for detection, which will increase the detection cost. Summary of the invention

[0005] In view of the above problems, a multi-point in-situ detection device for nitrite and nitric oxide is provided, which can effectively improve the detection efficiency and reduce the detection cost through an efficient collection device.

[0006] In order to solve the problems of the prior art, the present invention provides a multi-point in-situ detection device for nitrous acid and nitric oxide, comprising an efficient collection device for automatically collecting air from multiple locations, the efficient collection device being connected to a nitrous acid detector and a nitric oxide detector, the efficient collection device comprising a shunt collection pipeline, a multi-segment extractor, an air suction pump, a cleaning circulation pipeline and a circulating cleaning device; the shunt collection pipeline is installed in a collection area, and the shunt collection pipeline is provided with a plurality of collection ends distributed in different collection areas; the multi-segment extractor is installed at the output end of the shunt collection pipeline, the interior of the multi-segment extractor is connected to a nitrous acid detector and a nitric oxide detector, and the multi-segment extractor is used to extract part of the gas for detection; the air suction pump is connected to the shunt collection pipeline, and the air suction pump is used to suck the gas inside the shunt collection pipeline; the cleaning circulation pipeline is installed above the shunt collection pipeline, the cleaning circulation pipeline is provided with a plurality of liquid outlets, and the liquid outlet of the cleaning circulation pipeline is connected to the shunt collection pipeline; the input end of the circulating cleaning device is connected to the shunt collection pipeline, and the output end of the circulating cleaning device is connected to the cleaning circulation pipeline.

[0007] Preferably, the diversion air collection pipeline includes a mainstream air pipe installed in the collection area, a plurality of diversion air collection tubes are installed on the mainstream air pipe, a first three-way valve is installed at one end of the diversion air collection tube away from the mainstream air pipe, an air intake filter mechanism is also installed on the first three-way valve, and a second three-way valve is installed at the outlet end of the mainstream air pipe.

[0008] Preferably, the air intake filter mechanism includes a limit mounting sleeve installed on the first three-way valve, an air filter is installed inside the limit mounting sleeve, a rotating fan blade is also installed on the limit mounting sleeve, a cleaning brush is provided on the rotating fan blade, and the cleaning brush conflicts with the air filter.

[0009] Preferably, the multi-stage extractor includes a circulation installation tube installed on the mainstream air pipe, a nitrite detector and a nitric oxide detector are installed on the circulation installation tube, a plurality of rotating extraction mechanisms are installed inside the circulation installation tube, an extrusion device is also installed on the circulation installation tube, and the extrusion end of the extrusion device is arranged inside the rotating extraction mechanism.

[0010] Preferably, a plurality of maintenance installation ports are provided on the side of the circulation installation pipe, each maintenance installation port is provided with a fixed installation seat, a connecting hole is provided on the fixed installation seat, and an air filter layer is provided inside the connecting hole.

[0011] Preferably, the rotating extraction mechanism includes an extraction sleeve rotatably installed inside the circulation mounting tube, the outer wall of the extraction sleeve is provided with a sealing layer, a plurality of circulation holes are provided on the extraction sleeve, a mounting groove is also provided on the outer side of the extraction sleeve, a cleaning brush is provided inside the mounting groove, the rotating extraction mechanism also includes a synchronous rotation mechanism installed on the outer side of the circulation mounting tube, the synchronous rotation mechanism includes a rotating driver installed on the outer side of the circulation mounting tube, a driving gear is installed on the output end of the rotating driver, and the synchronous rotation mechanism also includes a plurality of driven gear rings evenly distributed on the extraction sleeve, and the driven gear rings are meshed with the driving gear.

[0012] Preferably, the extrusion device includes a pushing piston installed inside the extraction sleeve, and the extrusion device also includes a synchronous contraction mechanism installed on the outside of the circulation mounting tube, the synchronous contraction mechanism includes a plurality of contraction brackets distributed on both sides of the circulation mounting tube, the contraction brackets are fixed to the pushing piston, the synchronous contraction mechanism also includes a mounting bracket installed on the outside of the circulation mounting tube, a linear drive is installed on the mounting bracket, a sliding connecting rod is installed at the output end of the linear drive, a synchronous connecting block is slidably installed on the sliding connecting rod, a pushing spring is installed between the synchronous connecting block and the sliding connecting rod, and a synchronous connecting rod is installed between the synchronous connecting block and the contraction bracket.

[0013] Preferably, the cleaning circulation pipeline includes a mainstream infusion tube arranged above the shunt collection pipeline, the input end of the mainstream infusion tube is connected to the circulation cleaning equipment, a plurality of shunt infusion tubes are installed on the mainstream infusion tube, the shunt infusion tube is connected to the first three-way valve, and the inner walls of the cleaning circulation tube and the shunt collection pipeline are covered with spiral strips.

[0014] Preferably, the circulating cleaning equipment includes a liquid storage barrel, the liquid inlet end of the liquid storage barrel is connected to the second three-way valve, a rotating filtering mechanism is provided inside the liquid storage barrel, a cleaning liquid suction pump is installed on the top of the liquid storage barrel, the input end of the cleaning liquid suction pump is connected to the rotating filtering mechanism, and the output end of the clear liquid suction pump is connected to the mainstream infusion pipe.

[0015] Preferably, the rotating filtering mechanism includes a fixed mounting frame installed inside the liquid storage barrel, a self-rotating suction shaft is installed on the fixed mounting frame, a rotating flow blade is installed inside the self-rotating suction shaft, a cleaning liquid filter layer is also installed on the outside of the self-rotating suction shaft, the cleaning liquid filter layer is tapered, a fixed scraper is also installed on the fixed mounting frame, the fixed scraper is in conflict with the cleaning liquid filter layer, and a stirring rod is also installed on the outside of the self-rotating suction shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can automatically collect air samples from multiple areas without moving the detection equipment by installing a shunt collection pipe in the collection area and cooperating with an air pump to effectively guide the suction. This method avoids the cumbersome process of manually carrying the detection equipment to various areas for collection in the traditional method, greatly saving manpower and time. At the same time, the multi-stage extractor can efficiently extract samples from the flowing gas for analysis by the nitrous acid detector and the nitric oxide detector, ensuring the accuracy and efficiency of the detection.

[0018] 2. Compared with the method of using multiple detection devices to be placed in each collection area for detection, the present invention realizes the simultaneous detection of multiple collection areas through a set of systems, or the real-time detection of some areas in sequence. This not only reduces the purchase cost of the equipment, but also reduces the difficulty of maintenance and management. In addition, the introduction of the circulating cleaning equipment makes the cleaning of the shunt collection pipeline simple and quick, and there is no need to spend a lot of manpower to maintain the equipment, which effectively reduces manpower and avoids the detection error caused by the contamination of the shunt collection pipeline, further improving the economy and reliability of the detection.

[0019] 3. The device can continuously monitor the nitrite and nitric oxide content in the environment of the collection area according to the set detection cycle and frequency. This real-time monitoring method helps to promptly discover and deal with air quality problems in the observation area, providing residents with a healthier and safer living environment. At the same time, by recording and analyzing historical data, it can also provide a scientific basis for subsequent environmental improvement and management in the observation area, further improving the level of air quality management in the observation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional schematic diagram of a multi-point in-situ detection device for nitrite and nitric oxide Figure 1 .

[0021] Figure 2 A three-dimensional schematic diagram of a multi-point in-situ detection device for nitrite and nitric oxide Figure 2 .

[0022] Figure 3 The present invention is a planar cross-sectional stereoscopic diagram of an air intake filter mechanism in a multi-point in-situ detection device for nitrous acid and nitric oxide.

[0023] Figure 4 A three-dimensional schematic diagram of a multi-stage extractor in a multi-point in-situ detection device for nitrite and nitric oxide Figure 1 .

[0024] Figure 5 The present invention is a main view of a multi-stage extractor in a multi-point in-situ detection device for nitrite and nitric oxide.

[0025] Figure 6 yes Figure 5 A sectional perspective view at section AA.

[0026] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0027] Figure 8 The figure is a side view of a multi-stage extractor in a multi-point in-situ detection device for nitrite and nitric oxide.

[0028] Fig. 9 yes Figure 8 Cutaway perspective view at the CC section.

[0029] Fig.10 A three-dimensional schematic diagram of a multi-stage extractor in a multi-point in-situ detection device for nitrite and nitric oxide Figure 2 .

[0030] Fig.11 The present invention is a three-dimensional schematic diagram of a circulating cleaning device in a multi-point in-situ detection device for nitrite and nitric oxide.

[0031] Fig.12 It is a planar cutaway stereoscopic diagram of a circulating cleaning device in a multi-point in-situ detection device for nitrite and nitric oxide.

[0032] Fig.13 The present invention is a planar cross-sectional stereoscopic diagram of the structure of the cleaning circulation pipeline part in a multi-point in-situ detection device for nitrite and nitric oxide.

[0033] The numbers in the figure are:

[0034] 1. Diverter collection pipeline; 11. Main stream air pipe; 12. Diverter air collection pipe; 13. First three-way valve; 14. Intake filter mechanism; 141. Positioning sleeve; 142. Air filter; 143. Cleaning brush; 144. Rotating fan blade; 15. Second three-way valve; 2. Suction pump; 3. Multi-stage extractor; 31. Circulation installation pipe; 311. Maintenance installation port; 312. Fixed installation seat; 313. Air filter layer; 32. Rotating extraction mechanism; 321. Synchronous rotation mechanism; 3211. Rotating driver; 3212. Driving gear; 3213. Driven gear ring; 322. Extraction sleeve; 3221. Cleaning brush; 3222. Circulation hole; 3223. Installation groove; 33. Extrusion Pressure device; 331, push piston; 332, synchronous contraction mechanism; 333, contraction bracket; 334, mounting bracket; 335, linear drive; 336, synchronous connection block; 337, synchronous connecting rod; 338, sliding connecting rod; 339, push spring; 4, cleaning circulation pipeline; 41, mainstream infusion tube; 42, shunt infusion tube; 43, spiral strip; 5, circulation cleaning equipment; 51, liquid storage barrel; 52, cleaning liquid suction pump; 53, rotating filtering mechanism; 531, fixed mounting frame; 532, self-rotating suction shaft; 5321, rotating flow blade; 533, cleaning liquid filter layer; 534, fixed scraper; 535, stirring rod; 6, nitrite detector; 7, nitric oxide detector. DETAILED DESCRIPTION

[0035] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] See also Figures 1 to 13 As shown, a multi-point in-situ detection device for nitrous acid and nitric oxide includes an efficient collection device for automatically collecting air from multiple locations, the efficient collection device is connected to a nitrous acid detector 6 and a nitric oxide detector 7, and the efficient collection device includes a shunt collection pipeline 1, a multi-segment extractor 3, an air suction pump 2, a cleaning circulation pipeline 4 and a circulating cleaning device 5; the shunt collection pipeline 1 is installed in a collection area, and the shunt collection pipeline 1 is provided with a plurality of collection ends distributed in different collection areas; the multi-segment extractor 3 is installed at the output end of the shunt collection pipeline 1, the interior of the multi-segment extractor 3 is connected to the nitrous acid detector 6 and the nitric oxide detector 7, and the multi-segment extractor 3 is used to extract part of the gas for detection; the air suction pump 2 is connected to the shunt collection pipeline 1, and the air suction pump 2 is used to suck the gas inside the shunt collection pipeline 1; the cleaning circulation pipeline 4 is installed above the shunt collection pipeline 1, and the cleaning circulation pipeline 4 is provided with a plurality of liquid outlets, and the liquid outlet of the cleaning circulation pipeline 4 is connected to the shunt collection pipeline 1; the input end of the circulating cleaning device 5 is connected to the shunt collection pipeline 1, and the output end of the circulating cleaning device 5 is connected to the cleaning circulation pipeline 4.

[0037] First, the staff installs the shunt collection pipe 1 and the cleaning circulation pipe 4 in the collection area, ensuring that the multiple collection ends of the shunt collection pipe 1 can be evenly distributed in different collection areas. Each collection end of the shunt collection pipe 1 is connected to the collection area environment to effectively collect air samples in each area. The cleaning circulation pipe 4 is also installed above the shunt collection pipe 1, and the multiple liquid outlet ends of the cleaning circulation pipe 4 are connected to various parts of the shunt collection pipe 1, preparing for subsequent cleaning work.

[0038] When it is necessary to start the test, start the air pump 2. The air pump 2 sucks the air in each collection area in turn through the shunt collection pipeline 1, so that the air sample flows along the pipeline to the multi-stage extractor 3. The multi-stage extractor 3 is located at the output end of the shunt collection pipeline 1. The multi-stage extractor 3 can extract part of the sample from the gas flowing through for analysis by the nitrous acid detector 6 and the nitric oxide detector 7. After the extracted gas sample contacts the nitrous acid detector 6 and the nitric oxide detector 7. The two detectors use their respective detection principles to accurately measure the nitrous acid and nitric oxide content in the sample. After the test is completed, the detector transmits the results to the control system or display device for the staff to view and analyze.

[0039] In order to keep the pipeline clean and unobstructed, it is necessary to clean the pipeline after the detection. After the circulating cleaning device 5 is started, the input end of the circulating cleaning device 5 sprays the cleaning liquid from the liquid outlet end of the cleaning circulation pipeline 4 to circulate and clean the shunt collection pipeline 1. After the cleaning is completed, the circulating cleaning equipment 5 will recover and process the cleaning liquid to ensure the cleanliness and hygiene of the entire system. The air inside the circulating shunt collection pipe is then sucked by the suction pump 2. The gas circulation will cause the inner wall of the shunt collection pipe to dry. The staff can set the detection cycle and frequency as needed to achieve continuous monitoring of the content of nitrite and nitric oxide in the collection area environment. The present device realizes in-situ and efficient detection of nitrite and nitric oxide in multiple collection area environments.

[0040] See also Figure 1 and Figure 2 As shown, the diversion collection pipeline 1 includes a mainstream air pipe 11 installed in the collection area, and multiple diversion air collection pipes 12 are installed on the mainstream air pipe 11. A first three-way valve 13 is installed at one end of the diversion air collection pipe 12 away from the mainstream air pipe 11, and an air intake filter mechanism 14 is also installed on the first three-way valve 13. A second three-way valve 15 is installed at the outlet end of the mainstream air pipe 11.

[0041] The first three-way valve 13 is also connected to the output end of the cleaning circulation pipeline 4 , and the connecting port of the second three-way valve 15 is also connected to the suction pump 2 and the circulation cleaning device 5 .

[0042] The air collection pipeline is mainly composed of a mainstream air pipe 11 installed in the collection area and a plurality of branch air collection pipes 12. The mainstream air pipe 11 is the main transmission channel for the gas, and is connected to a plurality of branch air collection pipes 12, which extend to different collection areas to effectively collect air samples in each area.

[0043] A first three-way valve 13 is installed at one end of each shunt air collection pipe 12 away from the mainstream air pipe 11. One port of the first three-way valve 13 is connected to the shunt air collection pipe 12, and another port is connected to the air intake filter mechanism 14, which is connected to filter impurities and particulate matter in the air entering the pipe. The third port is connected to the output end of the cleaning circulation pipe 4, and is used to inject cleaning liquid into the shunt air collection pipe 12 during the cleaning stage.

[0044] A second three-way valve 15 is installed at the outlet end of the mainstream air pipe 11. One port of the second three-way valve 15 is connected to the mainstream air pipe 11, and another port is connected to the suction pump 2 for sucking the gas in the pipeline. The third port is connected to the circulating cleaning device 5 for receiving the cleaning liquid recovered in the cleaning stage.

[0045] When it is necessary to start the test, first close the port of the first three-way valve 13 connected to the cleaning circulation pipeline 4 and the port of the second three-way valve 15 connected to the circulation cleaning device 5, and then start the suction pump 2. The suction pump 2 sucks the air in the mainstream air pipe 11 and its various branch air collection pipes 12 through the second three-way valve 15, so that the air sample flows along the pipeline to the multi-stage extractor 3.

[0046] The multi-stage extractor 3 is located at the output end of the split flow collection pipeline 1, and can extract part of the sample from the gas flowing through. The extracted gas sample is then sent to the nitrous acid detector 6 and the nitric oxide detector 7 for analysis. The two detectors use their respective detection principles to accurately measure the nitrous acid and nitric oxide content in the sample, and transmit the results to the control system or display device for staff to view and analyze.

[0047] After the test is completed, the pipeline needs to be cleaned. In the cleaning stage, first close the port on the first three-way valve 13 connected to the air intake filter mechanism 14 and the port on the second three-way valve 15 connected to the suction pump 2. Then start the circulating cleaning device 5, and the input end of the circulating cleaning device 5 is connected to the mainstream air pipe 11 through the second three-way valve 15 to receive the cleaning liquid recovered from the mainstream air pipe 11. At the same time, the cleaning liquid is injected into each shunt air collection tube 12 from the output end of the cleaning circulation pipeline 4 through the first three-way valve 13 to circulate and clean the pipeline. After cleaning, the circulating cleaning device 5 recovers and processes the cleaning liquid. Subsequently, the air inside the circulation shunt collection tube is sucked by the suction pump 2, and the gas circulation will cause the inner wall of the shunt collection tube to dry. After cleaning and drying, the device can be put back into use for the next round of air sample collection and testing.

[0048] See also Figure 2 and Figure 3 As shown, the air intake filter mechanism 14 includes a limit mounting sleeve 141 installed on the first three-way valve 13, an air filter 142 is installed inside the limit mounting sleeve 141, a rotating fan blade 144 is also installed on the limit mounting sleeve 141, a cleaning brush 143 is provided on the rotating fan blade 144, and the cleaning brush 143 conflicts with the air filter 142.

[0049] An air filter 142 is installed inside the position-limiting installation sleeve 141 to filter small particles and impurities in the air. In addition, a rotating fan blade 144 is installed on the position-limiting installation sleeve 141, and a cleaning brush 143 is provided on the rotating fan blade 144, and the cleaning brush 143 contacts the air filter 142. When air passes through the air intake filter mechanism 14, the rotating fan blade 144 will rotate accordingly, driving the cleaning brush 143 to clean the air filter 142, preventing the filter from being blocked and ensuring the filtering effect.

[0050] See also Figures 1 to 4 As shown, the multi-stage extractor 3 includes a circulation installation tube 31 installed on the mainstream air pipe 11, a nitrite detector 6 and a nitric oxide detector 7 are installed on the circulation installation tube 31, a plurality of rotating extraction mechanisms 32 are installed inside the circulation installation tube 31, and an extrusion device 33 is also installed on the circulation installation tube 31, and the extrusion end of the extrusion device 33 is arranged inside the rotating extraction mechanism 32.

[0051] When the suction pump 2 starts and sucks the air in the mainstream air pipe 11 and its various branch air collection pipes 12, the air sample flows along the pipe to the multi-stage extractor 3. In the circulation installation pipe 31, multiple rotating extraction mechanisms 32 start to rotate to extract the gas sample in the air flow. At this time, the squeezing device 33 starts to work, and its squeezing end squeezes the extraction mechanism to further squeeze out the gas sample on the extraction mechanism to form a more concentrated sample gas.

[0052] The extracted gas sample is then contacted with a nitrous acid detector 6 and a nitric oxide detector 7 for analysis. The two detectors respectively use their respective detection principles to accurately measure the nitrous acid and nitric oxide content in the sample.

[0053] The detector transmits the measurement results to the control system or display device for staff to view and analyze. Staff can also view the test results in real time through the display device.

[0054] See also Figures 4 to 7 As shown, a plurality of maintenance installation ports 311 are provided on the side of the circulation installation pipe 31 , each maintenance installation port 311 is provided with a fixed installation seat 312 , a connecting hole is provided on the fixed installation seat 312 , and an air filter layer 313 is provided inside the connecting hole.

[0055] The side of the circulation installation tube 31 is provided with a plurality of maintenance installation ports 311. The design of these installation ports allows the staff to maintain, replace or adjust the key components such as the internal rotating extraction mechanism 32 and the extrusion device 33 without disassembling the entire circulation installation tube 31. The provision of the maintenance installation ports 311 improves the maintenance convenience and operability of the device. Each maintenance installation port 311 is provided with a fixed mounting seat 312, and the fixed mounting seat 312 is provided with a connecting hole. The connecting hole is used to connect and fix the nitrous acid detector 6 and the nitric oxide detector 7.

[0056] An air filter layer 313 is provided inside the connection hole, and the air filter layer 313 is used to filter the detection gas flowing out from the rotating extraction mechanism 32 to prevent impurities or particles therein from contaminating or interfering with the detector. The air filter layer 313 can effectively filter out impurities such as dust and particles in the gas, ensuring the purity and accuracy of the gas sample entering the detector.

[0057] See also Figures 4 to 10 As shown, the rotating extraction mechanism 32 includes an extraction sleeve 322 rotatably mounted inside the circulation mounting tube 31, the outer wall of the extraction sleeve 322 is provided with a sealing layer, a plurality of circulation holes 3222 are provided on the extraction sleeve 322, a mounting groove 3223 is also provided on the outer side of the extraction sleeve 322, a cleaning brush 3221 is provided inside the mounting groove 3223, the rotating extraction mechanism 32 also includes a synchronous rotation mechanism 321 mounted on the outer side of the circulation mounting tube 31, the synchronous rotation mechanism 321 includes a rotating driver 3211 mounted on the outer side of the circulation mounting tube 31, a driving gear 3212 is installed at the output end of the rotating driver 3211, and the synchronous rotation mechanism 321 also includes a plurality of driven gear rings 3213 evenly distributed on the extraction sleeve 322, and the driven gear rings 3213 are meshed with the driving gear 3212.

[0058] When the suction pump 2 starts and sucks the air in the mainstream air pipe 11 and each of its branch air collection pipes 12, the air sample flows along the pipe to the multi-stage extractor 3. In the circulation installation pipe 31, multiple rotating extraction mechanisms 32 start to rotate. The rotating extraction mechanism 32 includes an extraction sleeve 322 that is rotatably installed inside the circulation installation pipe 31, and the outer wall of the extraction sleeve 322 is provided with a sealing layer to ensure that the gas sample will not leak during the extraction process. The extraction sleeve 322 is provided with a plurality of circulation holes 3222, which allow the gas sample in the air flow to enter the extraction sleeve 322. As the extraction sleeve 322 rotates, the gas sample will stay inside the extraction sleeve 322. At this time, the extrusion device 33 starts to work, and its extrusion end squeezes the extraction sleeve 322, further squeezing out the gas sample on the extraction sleeve 322 to form a more concentrated sample gas. The concentrated gas sample then flows through the circulation installation pipe 31 and contacts the nitrous acid detector 6 and the nitric oxide detector 7 installed on the side. The two detectors use their own detection principles to accurately measure the nitrite and nitric oxide content in the sample. The detectors transmit the measurement results to the control system or display device for staff to view and analyze.

[0059] The rotary extraction mechanism 32 includes not only an extraction sleeve 322, but also a synchronous rotation mechanism 321 installed on the outside of the circulation installation tube 31. The synchronous rotation mechanism 321 includes a rotation driver 3211 installed on the outside of the circulation installation tube 31, and a driving gear 3212 is installed at the output end of the rotation driver 3211. The extraction sleeve 322 is provided with a driven gear ring 3213, which is meshed with the driving gear 3212, thereby ensuring that the extraction sleeve 322 can rotate with the rotation of the rotation driver 3211.

[0060] The outside of the extraction sleeve 322 is also provided with a mounting groove 3223, and the inside of the mounting groove 3223 is provided with a cleaning brush 3221. When the extraction sleeve 322 rotates, the cleaning brush 3221 will rotate accordingly and generate friction with the surface of the air filter layer 313. This friction can effectively clean the surface of the air filter layer 313 and remove impurities such as dust and particles attached thereto, thereby ensuring the continued effectiveness of the air filter layer 313 and the purity of the gas sample. The provision of the cleaning brush 3221 not only improves the maintenance convenience of the air filter layer 313, but also extends its service life and reduces the maintenance cost of the device.

[0061] See also Figures 4 to 10As shown, the extrusion device 33 includes a pushing piston 331 installed inside the extraction sleeve 322, and the extrusion device 33 also includes a synchronous contraction mechanism 332 installed on the outside of the circulation mounting tube 31. The synchronous contraction mechanism 332 includes a plurality of contraction brackets 333 distributed on both sides of the circulation mounting tube 31, and the contraction brackets 333 are fixed to the pushing piston 331. The synchronous contraction mechanism 332 also includes a mounting bracket 334 installed on the outside of the circulation mounting tube 31, and a linear drive 335 is installed on the mounting bracket 334. A sliding connecting rod 338 is installed on the output end of the linear drive 335, and a synchronous connecting block 336 is slidably installed on the sliding connecting rod 338. A pushing spring 339 is installed between the synchronous connecting block 336 and the sliding connecting rod 338, and a synchronous connecting rod 337 is installed between the synchronous connecting block 336 and the contraction bracket 333.

[0062] The compression device is mainly composed of a pushing piston 331 and a synchronous contraction mechanism 332. The pushing piston 331 is installed inside the extraction sleeve 322 and is used to squeeze the gas sample in the extraction sleeve 322. The synchronous contraction mechanism 332 includes a contraction bracket 333, a mounting bracket 334, a linear driver 335, a sliding connecting rod 338, a synchronous connecting block 336 and a pushing spring 339. The contraction bracket 333 is distributed on both sides of the circulation mounting tube 31 and is fixedly connected to the pushing piston 331. The mounting bracket 334 is installed on the outside of the circulation mounting tube 31, and the output end of the linear driver 335 is connected to the sliding connecting rod 338. A synchronous connecting block 336 is slidably installed on the sliding connecting rod 338, and a pushing spring 339 is installed between the synchronous connecting block 336 and the sliding connecting rod 338. The synchronous connecting block 336 is connected to the mounting bracket 334 through a synchronous connecting rod 337 to ensure synchronous movement. When enough gas samples are accumulated in the extraction sleeve 322, the extrusion device 33 starts to work. The linear drive 335 drives the sliding connecting rod 338 to move, thereby driving the synchronous connecting block 336 and the contraction bracket 333 to move. The movement of the contraction bracket 333 pushes the pushing piston 331 to move in the extraction sleeve 322 to squeeze the gas sample. During the squeezing process, the pushing spring 339 plays a role of buffering and maintaining synchronization to ensure the uniformity and stability of the squeezing. The squeezed gas sample is further concentrated, and then flows through the circulation installation tube 31 and contacts the nitrous acid detector 6 and the nitric oxide detector 7. Effective extraction, concentration and accurate detection of nitrous acid and nitric oxide in the air.

[0063] See also Figure 1 , Figure 2 and Fig.13As shown, the cleaning circulation pipeline 4 includes a mainstream infusion tube 41 arranged above the shunt collection pipeline 1, the input end of the mainstream infusion tube 41 is connected to the circulation cleaning equipment 5, and a plurality of shunt infusion tubes 42 are installed on the mainstream infusion tube 41, and the shunt infusion tubes 42 are connected to the first three-way valve 13. The inner walls of the cleaning circulation tube and the shunt collection pipeline 1 are covered with spiral strips 43.

[0064] The cleaning circulation pipeline 4 includes a mainstream infusion tube 41 and a plurality of shunt infusion tubes 42 arranged above the shunt collection pipeline 1. The input end of the mainstream infusion tube 41 is connected to the circulating cleaning device 5, which is used to receive and transport the cleaning liquid. The shunt infusion tube 42 is connected to the first three-way valve 13 to inject the cleaning liquid into each shunt air collection tube 12. The inner walls of the cleaning circulation tube and the shunt collection pipeline 1 are covered with spiral strips 43. The design of the spiral strips 43 can effectively guide the cleaning liquid to spirally rotate when flowing in the pipeline, thereby increasing the contact area and friction between the cleaning liquid and the inner wall of the pipeline. This design can significantly improve the cleaning effect and ensure thorough cleaning of the inner wall of the pipeline.

[0065] In the cleaning stage, the port on the first three-way valve 13 connected to the air intake filter mechanism 14 and the port on the second three-way valve 15 connected to the air suction pump 2 are closed. The circulating cleaning device 5 is started, and the cleaning liquid flows in from the mainstream infusion tube 41 and is injected into each branch air collection tube 12 through the branch infusion tube 42. When the cleaning liquid flows in the pipeline, it is guided by the spiral strip 43 to spirally rotate and thoroughly clean the inner wall of the pipeline. After the cleaning is completed, the circulating cleaning device 5 recovers and processes the cleaning liquid.

[0066] After cleaning is completed, the air inside the circulation and shunt collection tube is then sucked by the air pump 2 to air-dry the inner wall of the tube.

[0067] See also Figure 1 , Fig.11 and Fig.12 As shown, the circulating cleaning device 5 includes a liquid storage barrel 51, the liquid inlet end of the liquid storage barrel 51 is connected to the second three-way valve 15, a rotating filtering mechanism 53 is provided inside the liquid storage barrel 51, a cleaning liquid suction pump 52 is installed on the top of the liquid storage barrel 51, the input end of the cleaning liquid suction pump 52 is connected to the rotating filtering mechanism 53, and the output end of the clear liquid suction pump is connected to the mainstream infusion pipe 41.

[0068] The liquid storage barrel 51 is used to store cleaning liquid, and the liquid inlet end of the liquid storage barrel 51 is connected to the second three-way valve 15 so as to receive the cleaning liquid recovered from the mainstream air pipe 11 during the cleaning stage. The rotating filter mechanism 53 is arranged inside the liquid storage barrel 51, and is used to filter the recovered cleaning liquid, remove impurities and particulate matter therein, and ensure the reuse quality of the cleaning liquid. The cleaning liquid suction pump 52 is installed on the top of the liquid storage barrel 51, and its input end is connected to the rotating filter mechanism 53, and the output end is connected to the mainstream infusion pipe 41. The cleaning liquid suction pump 52 is responsible for sucking the cleaning liquid at the bottom of the liquid storage barrel 51 and transporting it to the mainstream infusion pipe 41.

[0069] During the cleaning phase, close the port on the first three-way valve 13 connected to the air intake filter mechanism 14 and the port on the second three-way valve 15 connected to the air suction pump 2 to ensure that the cleaning liquid can be smoothly injected and recovered. Start the cleaning liquid suction pump 52, and the pump sucks the cleaning liquid at the bottom of the liquid storage barrel 51 through the rotating filter mechanism 53. Affected by the flowing cleaning liquid, the rotating filter mechanism 53 starts to rotate. The cleaning liquid flows in from the mainstream infusion tube 41 and is injected into each shunt air collection tube 12 through the shunt infusion tube 42. When the cleaning liquid flows in the pipeline, it is guided by the spiral bar 43 to spirally rotate, increasing the contact area and friction between the cleaning liquid and the inner wall of the pipeline, and thoroughly cleaning the inner wall of the pipeline.

[0070] The recovered cleaning liquid enters the liquid storage barrel 51 through the second three-way valve 15, and is filtered again by the rotating filter mechanism 53. The rotation of the rotating filter mechanism 53 can effectively ensure that the cleaning liquid is filtered to remove impurities and particulate matter therein. The filtered cleaning liquid falls to the bottom of the liquid storage barrel 51 and is ready to be used again.

[0071] See also Fig.11 and Fig.12 As shown, the rotating filtering mechanism 53 includes a fixed mounting frame 531 installed inside the liquid storage barrel 51, a self-rotating suction shaft 532 is installed on the fixed mounting frame 531, a rotating flow blade 5321 is installed inside the self-rotating suction shaft 532, a cleaning liquid filter layer 533 is also installed on the outside of the self-rotating suction shaft 532, the cleaning liquid filter layer 533 is conical, a fixed scraper 534 is also installed on the fixed mounting frame 531, the fixed scraper 534 is in conflict with the cleaning liquid filter layer 533, and a stirring rod 535 is also installed on the outside of the self-rotating suction shaft 532.

[0072] When the cleaning liquid suction pump 52 is started, the pump sucks the cleaning liquid at the bottom of the liquid storage barrel 51 through the self-rotating suction shaft 532. When the cleaning liquid flows through the rotating flow blades 5321 inside the self-rotating suction shaft 532, it will push the rotating flow blades 5321 to rotate, thereby driving the self-rotating suction shaft 532 to rotate.

[0073] The cleaning liquid filter layer 533 is used to filter and recover the cleaning liquid. The cleaning liquid filter layer 533 is designed in a conical shape, which is conducive to the deposition and separation of impurities and particles. At the same time, the fixed scraper 534 contacts the cleaning liquid filter layer 533 to scrape off the impurities and particles attached to the cleaning liquid filter layer 533 to prevent clogging. The stirring rod 535 rotates with the self-rotating suction shaft 532 to stir the cleaning liquid in the liquid storage barrel 51.

[0074] Specific working principle:

[0075] First, the staff installs the shunt collection pipe 1 and the cleaning circulation pipe 4 in the collection area, ensuring that the multiple collection ends of the shunt collection pipe 1 can be evenly distributed in different collection areas. Each collection end of the shunt collection pipe 1 is connected to the collection area environment to effectively collect air samples in each area. The cleaning circulation pipe 4 is also installed above the shunt collection pipe 1, and the multiple liquid outlet ends of the cleaning circulation pipe 4 are connected to various parts of the shunt collection pipe 1, preparing for subsequent cleaning work.

[0076] When it is necessary to start the test, start the suction pump 2. The suction pump 2 sucks the air in each area in turn through the shunt collection pipeline 1, so that the air sample flows along the pipeline to the multi-stage extractor 3. The multi-stage extractor 3 is located at the output end of the shunt collection pipeline 1. The multi-stage extractor 3 can extract part of the sample from the gas flowing through for analysis by the nitrous acid detector 6 and the nitric oxide detector 7. After the extracted gas sample contacts the nitrous acid detector 6 and the nitric oxide detector 7. The two detectors use their respective detection principles to accurately measure the nitrous acid and nitric oxide content in the sample. After the test is completed, the detector transmits the results to the control system or display device for the staff to view and analyze.

[0077] In order to keep the pipeline clean and unobstructed, it is necessary to clean the pipeline after the detection. After the circulating cleaning device 5 is started, the input end of the circulating cleaning device 5 sprays the cleaning liquid from the liquid outlet end of the cleaning circulation pipeline 4 to circulate and clean the shunt collection pipeline 1. After the cleaning is completed, the circulating cleaning equipment 5 will recover and process the cleaning liquid to ensure the cleanliness and hygiene of the entire system. The air inside the circulating shunt collection pipe is then sucked by the suction pump 2. The gas circulation will cause the inner wall of the shunt collection pipe to dry. The staff can set the detection cycle and frequency as needed to achieve continuous monitoring of the content of nitrite and nitric oxide in the collection area environment. The present device realizes in-situ and efficient detection of nitrite and nitric oxide in multiple collection area environments.

[0078] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A multi-point in-situ detection device for nitrous acid and nitric oxide, characterized in that: It includes a high-efficiency collection device for automatically collecting air from multiple locations, the high-efficiency collection device is connected to a nitrous acid detector and a nitric oxide detector, and the high-efficiency collection device includes a split flow collection pipeline, a multi-stage extractor, an air suction pump, a cleaning circulation pipeline and a circulating cleaning device; The diversion collection pipeline is installed in the collection area, and the diversion collection pipeline is provided with multiple collection ends distributed in different collection areas; The multi-segment extractor is installed at the output end of the shunt collection pipeline, the interior of the multi-segment extractor is connected to the nitrous acid detector and the nitric oxide detector, and the multi-segment extractor is used to extract part of the gas from the output end of the shunt collection pipeline for detection; The suction pump is connected to the shunt collection pipeline, and is used to suck the gas inside the shunt collection pipeline; The cleaning circulation pipeline is installed above the shunt collection pipeline, and the cleaning circulation pipeline is provided with a plurality of liquid outlets, and the liquid outlets of the cleaning circulation pipeline are connected with the shunt collection pipeline; The input end of the circulation cleaning device is connected to the diversion collection pipeline, and the output end of the circulation cleaning device is connected to the cleaning circulation pipeline; The split air collection pipeline includes a mainstream air pipe installed in the collection area, a plurality of split air collection pipes are installed on the mainstream air pipe, a first three-way valve is installed at one end of the split air collection pipe away from the mainstream air pipe, an air intake filter mechanism is also installed on the first three-way valve, and a second three-way valve is installed at the outlet end of the mainstream air pipe; The multi-stage extractor comprises a flow installation tube installed on the mainstream air pipe, a nitrous acid detector and a nitric oxide detector are installed on the flow installation tube, a plurality of rotating extraction mechanisms are installed inside the flow installation tube, an extrusion device is also installed on the flow installation tube, and an extrusion end of the extrusion device is arranged inside the rotating extraction mechanism; The rotary extraction mechanism includes an extraction sleeve rotatably mounted inside the circulation installation tube, the outer wall of the extraction sleeve is provided with a sealing layer, a plurality of circulation holes are provided on the extraction sleeve, a mounting groove is also provided on the outer side of the extraction sleeve, a cleaning brush is provided inside the mounting groove, the rotary extraction mechanism also includes a synchronous rotation mechanism installed on the outer side of the circulation installation tube, the synchronous rotation mechanism includes a rotary driver installed on the outer side of the circulation installation tube, a driving gear is installed on the output end of the rotary driver, and the synchronous rotation mechanism also includes a plurality of driven gear rings evenly distributed on the extraction sleeve, and the driven gear rings are meshed with the driving gear; The extrusion device includes a pushing piston installed inside the extraction sleeve, and the extrusion device also includes a synchronous contraction mechanism installed on the outside of the circulation mounting tube. The synchronous contraction mechanism includes a plurality of contraction brackets distributed on both sides of the circulation mounting tube, and the contraction brackets are fixed to the pushing piston. The synchronous contraction mechanism also includes a mounting bracket installed on the outside of the circulation mounting tube, and a linear drive is installed on the mounting bracket. A sliding connecting rod is installed at the output end of the linear drive, and a synchronous connecting block is slidably installed on the sliding connecting rod. A pushing spring is installed between the synchronous connecting block and the sliding connecting rod, and a synchronous connecting rod is installed between the synchronous connecting block and the contraction bracket.

2. A multi-point in-situ detection device for nitrous acid and nitric oxide according to claim 1, characterized in that: The air intake filter mechanism comprises a limit installation sleeve installed on the first three-way valve, an air filter is installed inside the limit installation sleeve, a rotating fan blade is also installed on the limit installation sleeve, a cleaning brush is arranged on the rotating fan blade, and the cleaning brush conflicts with the air filter.

3. A multi-point in-situ detection device for nitrous acid and nitric oxide according to claim 2, characterized in that: A plurality of maintenance installation ports are arranged on the side of the circulation installation pipe, each of which is provided with a fixed installation seat, a connecting hole is arranged on the fixed installation seat, and an air filter layer is arranged inside the connecting hole.

4. A multi-point in-situ detection device for nitrous acid and nitric oxide according to claim 3, characterized in that: The cleaning circulation pipeline includes a mainstream infusion tube arranged above the shunt collection pipeline, the input end of the mainstream infusion tube is connected to the circulation cleaning equipment, a plurality of shunt infusion tubes are installed on the mainstream infusion tube, the shunt infusion tubes are connected to the first three-way valve, and the inner walls of the cleaning circulation tube and the shunt collection pipeline are covered with spiral strips.

5. A multi-point in-situ detection device for nitrous acid and nitric oxide according to claim 4, characterized in that: The circulating cleaning equipment includes a liquid storage barrel, the liquid inlet end of the liquid storage barrel is connected to the second three-way valve, a rotating filtering mechanism is provided inside the liquid storage barrel, a cleaning liquid suction pump is installed on the top of the liquid storage barrel, the input end of the cleaning liquid suction pump is connected to the rotating filtering mechanism, and the output end of the clear liquid suction pump is connected to the mainstream infusion pipe.

6. A multi-point in-situ detection device for nitrous acid and nitric oxide according to claim 5, characterized in that: The rotating filtering mechanism includes a fixed mounting frame installed inside the liquid storage barrel, a self-rotating suction shaft is installed on the fixed mounting frame, a rotating flow blade is installed inside the self-rotating suction shaft, a cleaning liquid filter layer is also installed on the outside of the self-rotating suction shaft, the cleaning liquid filter layer is tapered, a fixed scraper is also installed on the fixed mounting frame, the fixed scraper is in conflict with the cleaning liquid filter layer, and a stirring rod is also installed on the outside of the self-rotating suction shaft.

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