CN106370482B - Tail gas collecting box for detecting PM2.5 content of automobile tail gas - Google Patents
Tail gas collecting box for detecting PM2.5 content of automobile tail gas Download PDFInfo
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- CN106370482B CN106370482B CN201610936492.4A CN201610936492A CN106370482B CN 106370482 B CN106370482 B CN 106370482B CN 201610936492 A CN201610936492 A CN 201610936492A CN 106370482 B CN106370482 B CN 106370482B
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- inner box
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- pipe
- box body
- tail gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
Abstract
The invention belongs to the field of automobiles, and particularly relates to an exhaust gas collecting box for detecting PM2.5 content of automobile exhaust gas. The tail gas collecting box comprises an inner box, an outer box, an air inlet pipe, an air outlet pipe, a temperature sensor, a humidity sensor, a PM2.5 detector and a vehicle-mounted inverter; the tail gas collecting box is arranged in the automobile trunk; the inner box is arranged in the outer box; one end of the air inlet pipe is connected with the automobile exhaust pipe through a plastic pipe, and the other end of the air inlet pipe penetrates through the outer box and stretches into the inner box; one end of the exhaust pipe is arranged in the inner box, and the other end of the exhaust pipe passes through the inner box and the outer box and is arranged in the air; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged between the outer box and the inner box; the heating plate is stuck outside the box body of the inner box, and a power line of the heating plate is connected with the vehicle-mounted inverter arranged outside the outer box. The invention relates to an exhaust gas collecting box for detecting the PM2.5 content of automobile exhaust, which can measure the PM2.5 content of automobile exhaust at different speeds.
Description
Technical Field
The invention belongs to the field of automobiles, and particularly relates to an exhaust gas collecting box for detecting PM2.5 content of automobile exhaust gas.
Background
The rapid increase of the content of PM2.5 in the air has become a major problem of air pollution in recent years, the harm of PM2.5 to human bodies is great, and diseases including bronchitis, asthma, cardiovascular diseases and the like can be caused after PM2.5 enters the human bodies, so that the method has become one of the main research hot spots in recent years. And the emission of automobile exhaust is a main cause for increasing PM2.5 in the air. With the rapid development of economy, the number of automobiles in China has a rapid increasing trend in recent years. At present, the automobile exhaust detection device in China is mainly used for detecting common gases such as CO, NO and the like, but is less in PM2.5 in automobile exhaust, and an exhaust collection box special for detecting PM2.5 in automobile exhaust is less.
Because the automobile exhaust emission has the characteristic of flow property, temperature and humidity, the automobile exhaust emission is different from the general atmospheric environment condition. Therefore, the number of the PM2.5 tail gas collecting boxes specially used for automobile tail gas is small at present, and few patents exist in the aspect. The patent of the present aspect has a Chinese patent publication number of CN104777083A, a publication date of 2015, 7 months and 15 days, a patent number of 201510205893 for an automobile exhaust PM2.5 detection device and detection method, a patent publication number of CN204514765U, a publication date of 2015, 7 months and 29 days, and a patent number of 201520261989 for an automobile exhaust PM2.5 detection device. Both of these devices can be used to measure PM2.5 content in automobile exhaust, but both suffer from the following drawbacks: 1 can only be carried out under an idle working condition, and the PM2.5 content in tail gas at different speeds cannot be measured; 2, no exhaust pipe is arranged, so that the environment of the automobile exhaust in the exhaust pipe cannot be well simulated; 3, an air inlet pipe is not arranged, so that gas leakage is easy to occur, and the tail gas cannot be ensured to enter the collecting tank completely; 4, the detector and the temperature and humidity sensor are both positioned in the detection box, so that the detector is easily affected by the temperature and humidity in the tail gas, and the error is larger for the experiment; and 5, the collecting boxes are all made of plastics, the preheating time of the heating plate is too long, and the detection efficiency is low.
Disclosure of Invention
The invention provides the tail gas collecting box for detecting the PM2.5 content of the automobile tail gas, which has a simple structure and can measure the PM2.5 content of the automobile tail gas at different speeds, and the defects of the existing tail gas collecting device are overcome.
The technical scheme of the invention is as follows in combination with the accompanying drawings:
the tail gas collecting box for detecting the PM2.5 content of the automobile tail gas comprises an inner box 16, an outer box 17, an air inlet pipe 1, an air outlet pipe 6, a temperature sensor, a humidity sensor, a PM2.5 detector and a vehicle-mounted inverter; the tail gas collecting box is arranged in the automobile trunk; the inner box 16 is arranged in the outer box 17; one end of the air inlet pipe 1 is connected with an automobile exhaust pipe through a plastic pipe, and the other end of the air inlet pipe penetrates through the outer box 17 and stretches into the inner box 16; one end of the exhaust pipe 6 is arranged in the inner box 16, and the other end passes through the inner box 16 and the outer box 17 to be arranged in the air; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged between the outer box 17 and the inner box 16; the heating plate is stuck outside the box body of the inner box 16, and a power line of the heating plate is connected with the vehicle-mounted inverter arranged outside the outer box 17.
The inner box 16 is made of aluminum alloy and is cuboid and comprises an inner box body and an inner box cover; the inner box cover is connected with the inner box body through bolts 11; a rectangular first heating plate 2 is stuck above the inner box cover; the front surface of the outer side of the inner box body is stuck with a rectangular second heating plate 10; the back of the outer side of the inner box body is stuck with a rectangular third heating plate 3; the front and back surfaces of the inner box body are respectively reserved with a first probe inlet 8 and a second probe inlet 5; the first probe inlet port 8 and the second probe inlet port 5 are respectively provided with a probe sealing ring 15; holes for inserting the air inlet pipe 1 and the air outlet pipe 6 are formed in the left side and the right side of the inward box body.
The air inlet pipe 1 and the air outlet pipe 6 are cylindrical, and the air inlet pipe 1 is connected with the plastic pipe and then sealed by a sealing strip.
The outer box 17 is made of glass and is rectangular and comprises an outer box body; holes for inserting the air inlet pipe 1 and the air outlet pipe 6 are respectively formed in the left side and the right side of the outer box body; a first shelving table 4 and a second shelving table 9 are arranged between the middle positions of the front surface and the back surface of the outer box body and the inner box body; the first and second shelving tables 4 and 9 are made of glass and are rectangular; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the first shelving unit 4; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the second shelving unit 9; the front surface of the outer box body is provided with an electric wire outlet 7; the power lines of the first heating plates 2, the second heating plates 10 and the third heating plates 3 are connected with an inverter outside the outer box 17 through the electric wire outlet 7.
The first probes 12, 13 and 14 of the temperature sensor, the humidity sensor and the PM2.5 detector in the first shelving unit 4 enter the inner box 16 through the first probe inlet 5; the first, second and third probes 12, 13 and 14 of the temperature sensor, the humidity sensor and the PM2.5 detector in the second shelving unit 9 enter the inner box 16 through the second probe inlet 8; the first, second and third probes 12, 13 and 14 are respectively wound on the thin and straight hard rod by fine wires, so that the first, second and third probes 12, 13 and 14 are positioned at the middle part of the inner box body.
The beneficial effects of the invention are as follows:
1. the device can measure PM2.5 in automobile exhaust under different speeds.
2. Because a large amount of vapor in the exhaust emission can cause the humidity in the exhaust collecting box to increase so as to influence the accuracy of test data, the collecting box is provided with a heating plate with better performance, and the temperature of the heating plate is controllable and adjustable, and the heating efficiency is higher. The temperature can be controlled within the temperature difference range of the automobile exhaust temperature, and the influence of humidity on PM2.5 concentration detection is greatly reduced.
3. The inner box is formed by connecting a top cover and an inner box body, if the inner box is not sealed, the tail gas can be directly discharged into the atmosphere, and the measurement accuracy is reduced. And the temperature sensor, the humidity sensor and the PM2.5 detector are all positioned outside the inner box, and do not occupy the volume of gas in the inner box, so the collection box has better tightness except the exhaust pipe.
4. The inner box is made of aluminum alloy, so that the preheating effect is good, and the detection precision is greatly improved.
5. The outer box is provided with a rest table, so that the position arrangement of the temperature sensor, the humidity sensor and the PM2.5 detector is more reasonable, and the reliability of detection data is improved.
6. Because the temperature sensor and the PM2.5 detector are not arranged in the inner box, the influence of the tail gas humidity on the temperature sensor and the PM2.5 detector is small, and the accuracy of the detection result is improved.
7. The outer box is transparent glass, is favorable to the reading of record detector.
8. The exhaust pipe is arranged, so that the environment of tail gas in the automobile exhaust pipe is better simulated, and the inaccuracy of experimental data caused by the increase of PM2.5 content due to the extension of time is reduced.
9. The device has simple structure and is easy to realize.
Drawings
FIG. 1 is a schematic top view of the overall structure of the present invention;
FIG. 2 is a schematic front view of the overall structure of the present invention;
FIG. 3 is a schematic diagram of a probe of a temperature sensor, a humidity sensor and a PM2.5 detector sensor according to the present invention;
fig. 4 is a schematic view of a seal ring at the probe inlet.
In the figure: 1. an air inlet pipe; 2. a first heating plate; 3. a third heating plate; 4. a first rest; 5. a first probe access port; 6. an exhaust pipe; 7. a first wire outlet; 8. a second probe access port; 9. a second rest; 10. a second heating plate; 11. a bolt; 12. a first probe; 13. a second probe; 14. a third probe; 15. a probe sealing ring; 16. an inner box; 17. an outer box.
Detailed Description
Referring to fig. 1 and 2, an exhaust gas collecting box for detecting PM2.5 content in automobile exhaust gas comprises an inner box 16, an outer box 17, an air inlet pipe 1, an exhaust pipe 6, a temperature sensor, a humidity sensor, a PM2.5 detector and a vehicle-mounted inverter.
Referring to fig. 1, 2 and 4, the inner box 16 is rectangular and made of aluminum alloy, so that the heating effect is good, and the detection precision is greatly improved. The inner box 16 comprises an inner box body and an inner box cover; the inner box cover is connected with the inner box body through bolts 11; a rectangular first heating plate 2 is stuck above the inner box cover; the front surface of the outer side of the inner box body is stuck with a rectangular second heating plate 10; the back of the outer side of the inner box body is stuck with a rectangular third heating plate 3; because a large amount of vapor in the exhaust emission can cause the humidity in the exhaust collecting box to increase so as to influence the accuracy of test data, the collecting box is provided with a heating plate with better performance, and the temperature of the heating plate is controllable and adjustable, and the heating efficiency is higher. The temperature can be controlled within the temperature difference range of the automobile exhaust temperature, and the influence of humidity on PM2.5 concentration detection is greatly reduced. The front and back surfaces of the inner box body are respectively reserved with a first probe inlet 8 and a second probe inlet 5; the first probe inlet port 8 and the second probe inlet port 5 are respectively provided with a probe sealing ring 15; holes for inserting the air inlet pipe 1 and the air outlet pipe 6 are formed in the left side and the right side of the inward box body.
Referring to fig. 1 and 2, the air inlet pipe 1 and the air outlet pipe 6 are cylindrical; the air inlet pipe 1 and the air outlet pipe 6 are connected with the inner box 16. One end of the air inlet pipe 1 is connected with an automobile exhaust pipe through a plastic pipe, and the other end of the air inlet pipe penetrates through the outer box 17 and stretches into the inner box 16; one end of the exhaust pipe 6 is arranged in the inner box 16, and the other end passes through the inner box 16 and the outer box 17 to be arranged in the air; the air inlet pipe 1 is connected with the plastic pipe and then sealed by a sealing strip. The plastic pipe is selected to have specific specification, high temperature resistance and not easy to be too long, and can be enough from an automobile exhaust pipe to an automobile trunk. The setting of this device blast pipe 6, better simulation tail gas in the environment of vehicle vent-pipe has reduced because the extension of time makes PM2.5 increase and the inaccuracy of experimental data that causes.
Referring to fig. 1 and 2, the outer case 17 is made of glass and is rectangular, and comprises an outer case body without a cover; holes for inserting the air inlet pipe 1 and the air outlet pipe 6 are respectively formed in the left side and the right side of the outer box body; a first shelving table 4 and a second shelving table 9 are arranged between the middle positions of the front surface and the back surface of the outer box body and the inner box body; the first and second shelving units 4 and 9 are made of glass and are cuboid, and the length of the first and second shelving units is enough to put down a temperature sensor, a humidity sensor and a PM2.5 detector; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the first shelving unit 4; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the second shelving unit 9; the arrangement of the positions of the temperature sensor, the humidity sensor and the PM2.5 detector is more reasonable due to the arrangement of the first rest table 4 and the second rest table 9, and the reliability of detection data is improved. And because the temperature sensor and the PM2.5 detector are not arranged in the inner box 16, the influence of the tail gas humidity on the temperature sensor and the PM2.5 detector is small, and the accuracy of the detection result is improved. Because the outer box adopts the glass material, be favorable to the reading of record detector more. The front surface of the outer box body is provided with an electric wire outlet 7; the length of the power wires of the first heating plates 2, the second heating plates 10 and the third heating plates 3 is enough to be connected with an inverter outside the outer box 17 through the wire outlet 7 at the left lower corner of the front surface of the outer box.
Referring to fig. 1 and 2, four bolts 11 are respectively mounted on four corners of the inner case cover for sealing the inner case. If the sealing is not carried out, the tail gas is directly discharged into the atmosphere, and the measurement accuracy is reduced. And the temperature sensor, the humidity sensor and the PM2.5 detector are all positioned outside the inner box, and do not occupy the volume of gas in the inner box, so the collection box has better tightness except the exhaust pipe.
Referring to fig. 3, the first, second and third probes 12, 13 and 14 of the temperature sensor, the humidity sensor and the PM2.5 detector in the first rest stand 4 enter the inner box 16 through the first probe inlet 5; the first, second and third probes 12, 13 and 14 of the temperature sensor, the humidity sensor and the PM2.5 detector in the second shelving unit 9 enter the inner box 16 through the second probe inlet 8; the first, second and third probes 12, 13 and 14 are respectively wound on the thin and straight hard rod by fine wires, so that the first, second and third probes 12, 13 and 14 are positioned at the middle part of the inner box body. The first, second and third probes 12, 13 and 14 have the same structure.
The working principle of the invention is as follows: when the tail gas detection is carried out by a worker, the worker needs to make preparation work, two temperature sensors, two humidity sensors and two PM2.5 detectors are respectively placed on a placing table of an outer box, the temperature sensor probes, the humidity sensor probes and the PM2.5 detector probes are respectively wound on thin straight hard rods by thin wires and respectively enter through probe inlet openings specially formed in the front face and the back face of the inner box, the two groups of probes are positioned at the middle part of the inner box, and the two groups of probes are used for comparing data. Before detection, the circuits of the 3 heating plates are well arranged, the wires are led out from the wire outlets of the outer box and connected with the inverter, and then the inverter is connected with the vehicle-mounted cigar lighter for preheating treatment. When the temperature reaches the set temperature, the constant temperature is automatically kept. A plastic pipe with a specific specification is used, one end of the plastic pipe is connected with an automobile exhaust pipe and is sealed by a sealing strip, and the other end of the plastic pipe is connected with an air inlet pipe and is also sealed by the sealing strip. The plastic pipe is resistant to high temperature, but is not too long enough to pass from the automobile exhaust pipe to the automobile trunk. Because the water vapor in the automobile exhaust enters the plastic pipe and is condensed into water drops after cooling, the experimental result is greatly error, but if the water vapor in the exhaust is completely removed, the state of the automobile exhaust is different from that of the exhaust in the automobile, and the detection result is also greatly error. Here, in order to better guarantee the temperature and humidity environment of tail gas in the automobile, the rubber heating plate is wrapped on the outer side of the plastic pipe to regulate and control the temperature to the temperature of the tail gas in the exhaust barrel, and the tail gas enters the collecting tank after being preheated. Automobile exhaust in the exhaust collection box is detected through a PM2.5 detector, and the PM2.5 detector can be connected with a computer through a USB line, so that experimental data can be recorded in real time. The tail gas enters the inner box from the air inlet pipe and is discharged from the exhaust pipe after passing through various probes. Before the experiment starts, the initial temperature, humidity and PM2.5 concentration of the environment in the tail gas collecting box are recorded, the trunk of the test vehicle is opened during the experiment, the tail gas collecting box is arranged in the trunk and is connected with an automobile exhaust pipe and an air inlet pipe of the collecting box through the plastic pipe, and the emission concentration of the tail gas PM2.5 of the test vehicle at different speeds is detected. And finally, finishing data of the test vehicle running on the same experimental road under different vehicle speeds to obtain detection results of PM2.5 in automobile exhaust under different vehicle speeds.
The collecting box is simple in structure and easy to realize, and PM2.5 in automobile exhaust can be measured at different speeds.
Claims (1)
1. The detection method for detecting the PM2.5 content of the automobile exhaust is realized by an exhaust collecting box for detecting the PM2.5 content of the automobile exhaust, and is characterized in that the exhaust collecting box comprises an inner box (16), an outer box (17), an air inlet pipe (1), an air outlet pipe (6), a temperature sensor, a humidity sensor, a PM2.5 detector and a vehicle-mounted inverter; the tail gas collecting box is arranged in the automobile trunk; the inner box (16) is arranged in the outer box (17); one end of the air inlet pipe (1) is connected with an automobile exhaust pipe through a plastic pipe, and the other end of the air inlet pipe penetrates through the outer box (17) and stretches into the inner box (16); one end of the exhaust pipe (6) is arranged in the inner box (16), and the other end of the exhaust pipe passes through the inner box (16) and the outer box (17) to be arranged in the air; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged between the outer box (17) and the inner box (16); a heating plate is stuck outside the box body of the inner box (16), and a power line of the heating plate is connected with a vehicle-mounted inverter arranged outside the outer box (17); the inner box (16) is made of aluminum alloy and is cuboid and comprises an inner box body and an inner box cover; the inner box cover is connected with the inner box body through bolts (11); a rectangular first heating plate (2) is stuck above the inner box cover; a rectangular second heating plate (10) is stuck on the front surface of the outer side of the inner box body; a rectangular third heating plate (3) is stuck to the back surface of the outer side of the inner box body; the front and back surfaces of the inner box body are respectively reserved with a first probe inlet port (8) and a second probe inlet port (5); the first probe inlet port (8) and the second probe inlet port (5) are respectively provided with a probe sealing ring (15); holes for inserting an air inlet pipe (1) and an air outlet pipe (6) are formed in the left side and the right side of the inner box body; the air inlet pipe (1) and the air outlet pipe (6) are cylindrical, and the air inlet pipe (1) is connected with the plastic pipe and then sealed by a sealing strip; the outer box (17) is made of glass and is rectangular and comprises an outer box body; holes for inserting an air inlet pipe (1) and an air outlet pipe (6) are respectively formed in the left side and the right side of the outer box body; a first shelving table and a second shelving table (4 and 9) are arranged between the middle positions of the front surface and the back surface of the outer box body and the inner box body; the first and second shelving tables (4, 9) are made of glass and are cuboid; a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the first shelving table (4); a temperature sensor, a humidity sensor and a PM2.5 detector are arranged in the second shelving table (9); the front surface of the outer box body is provided with an electric wire outlet (7); the power lines of the first heating plates (2), the second heating plates and the third heating plates (10, 3) are connected with an inverter outside the outer box (17) through an electric wire outlet (7); the first probes (12, 13, 14) of the temperature sensor, the humidity sensor and the PM2.5 detector in the first shelving table (4) enter the inner box (16) through the first probe inlet (5); the first, second and third probes (12, 13, 14) of the temperature sensor, the humidity sensor and the PM2.5 detector in the second shelving table (9) enter the inner box (16) through the second probe inlet (8); the first, second and third probes (12, 13, 14) are respectively wound on the thin and straight hard rod by fine wires, so that the first, second and third probes (12, 13, 14) are positioned at the middle part of the inner box body; the detection method comprises the following steps: before the experiment starts, the initial temperature, humidity and PM2.5 concentration of the environment in the tail gas collecting box are recorded, the trunk of the experiment vehicle is opened during the experiment, the tail gas collecting box is arranged in the trunk, the automobile exhaust pipe and the collecting box air inlet pipe are connected through the plastic pipe, and the tail gas is discharged from the exhaust pipe after entering the inner box from the air inlet pipe and passing through various probes; detecting the emission concentration of the tail gas PM2.5 of the test vehicle at different vehicle speeds; and finally, finishing data of the test vehicle running on the same experimental road under different vehicle speeds to obtain detection results of PM2.5 in automobile exhaust under different vehicle speeds.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610936492.4A CN106370482B (en) | 2016-10-25 | 2016-10-25 | Tail gas collecting box for detecting PM2.5 content of automobile tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610936492.4A CN106370482B (en) | 2016-10-25 | 2016-10-25 | Tail gas collecting box for detecting PM2.5 content of automobile tail gas |
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| CN106370482A CN106370482A (en) | 2017-02-01 |
| CN106370482B true CN106370482B (en) | 2023-10-20 |
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| CN201610936492.4A Active CN106370482B (en) | 2016-10-25 | 2016-10-25 | Tail gas collecting box for detecting PM2.5 content of automobile tail gas |
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| CN106370482A (en) | 2017-02-01 |
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