CN211478081U - Detection gas circuit for measuring automobile exhaust - Google Patents

Detection gas circuit for measuring automobile exhaust Download PDF

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Publication number
CN211478081U
CN211478081U CN201921712357.7U CN201921712357U CN211478081U CN 211478081 U CN211478081 U CN 211478081U CN 201921712357 U CN201921712357 U CN 201921712357U CN 211478081 U CN211478081 U CN 211478081U
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gas
electromagnetic valve
way
way electromagnetic
valve
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梁兆锋
黎鸿智
郭文霏
罗锦羲
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Nanhua Instruments Co ltd
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Nanhua Instruments Co ltd
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Abstract

The utility model provides a measure automobile exhaust's detection gas circuit, includes tail gas collection system (1) water filter (3), physics condenser (4), water separator (5), air pump, electronic cooler, solenoid valve and gas analysis optical platform. The utility model discloses a measure automobile exhaust's detection gas circuit has set up dust particle material and vapor in the multi-stage filtration gets rid of the sample gas to set up the electronic cooler, guarantee to detect the temperature stability when gaseous when measuring, make measuring environment unanimous relatively at every turn, thereby measuring result good reproducibility. The leakage detection and the environmental air inspection can be automatically completed before starting up and measuring each time; and the back flushing cleaning can be automatically completed after one vehicle is detected. High automation degree, simple operation and high efficiency.

Description

Detection gas circuit for measuring automobile exhaust
Technical Field
The utility model belongs to the technical field of the automobile exhaust detects and specifically relates to a measure automobile exhaust's detection gas circuit.
Background
GB18285-2018 gasoline car pollutant emission limit and measurement method implemented from No. 5/1 in 2019 clearly stipulates that the determination of NO gas cannot adopt an electrochemical method, and preferably adopts an infrared method, an ultraviolet method or a chemiluminescence method. GB3847-2018, diesel vehicle pollutant emission limit and measurement method, implemented from No. 5/1 in 2019, also adds descriptions on the diesel vehicle nitrogen oxide emission limit and measurement method, and clearly specifies that the measurement cannot be carried out by an electrochemical method. Therefore, the original automobile exhaust gas tester cannot meet the detection requirement, and the original automobile exhaust gas tester needs to be upgraded and modified to improve the detection method of the nitrogen oxide.
Chinese patent CN 106645104 a proposes a system for detecting nitrogen oxides in automobile exhaust, which is provided with a gas conversion device to convert nitrogen dioxide into nitrogen monoxide by heating reduction for measurement, but to obtain a high conversion rate, the gas should reach a high temperature of 600 ℃ or higher, so the requirement for high temperature resistance of the device is relatively high. Such meters must be tested for initial use, periodic maintenance, and calibration of the meter to ensure that the conversion rate meets the specifications of the meter or the relevant specifications. In addition, when the existing diesel vehicle nitrogen oxide detector is used for on-site metering and calibration, the ozone generator method in the new vehicle type inspection cannot be referred to for the conversion rate detection. The detection equipment required to be configured by the method is complex, poor in portability and complex in operation steps, and is not suitable for field metering calibration of large-scale and wide-range in-use vehicle detection equipment. Therefore, the conversion rate of the existing diesel vehicle nitrogen oxide detector is not provided with a clear and reliable detection method.
Chinese patent CN 109142643 a proposes a detection method and a corresponding detection device for detecting the conversion rate of a diesel vehicle nitrogen oxide detector, but the gas path is relatively complex and the response time of detection is long.
The infrared method or the ultraviolet method does not have the problems, but the dust and the water vapor in the automobile exhaust can influence the measurement result of the detection method, so the dust filtration and the water removal of the exhaust are required before the detection. The standards also require that the instruments be automated to perform and perform leak checks and auto-calibration.
Disclosure of Invention
For overcoming current defect, the utility model provides a measure automobile exhaust's detection gas circuit. A detection gas circuit for measuring automobile exhaust comprises an exhaust gas collecting device and a back-blowing compressed air source, wherein the exhaust gas collecting device is connected with a pre-filter, the pre-filter is connected with a physical condenser through a water filter, the water separator is connected, the physical condenser of the water separator is respectively connected with a first three-way electromagnetic valve and a second three-way electromagnetic valve,
the first three-way electromagnetic valve is connected with a first air pump, and the first air pump is connected with a second water outlet through a first one-way valve;
the second three-way electromagnetic valve is connected with a second fiber filter screen, the second fiber filter screen is connected with a second air pump through a pressure sensor, the second air pump is connected with a second electronic cooler, the second electronic cooler is connected with an HC/CO/CO2 gas analysis optical platform through a fifth one-way valve, and the HC/CO/CO2 gas analysis optical platform is connected with a first exhaust port through an oxygen sensor;
the water filter is connected with the first drainage port through a third three-way electromagnetic valve;
the first three-way electromagnetic valve and the second three-way electromagnetic valve are connected with an ambient air inlet through the first water separator.
And the blowback compressed air source is connected with the second three-way electromagnetic valve through the fifth two-way electromagnetic valve.
The second air pump is connected with a first electronic cooler, the first electronic cooler is connected with a NOx gas analysis optical platform through a second one-way valve, the NOx gas analysis optical platform is connected with a second air outlet, and the first electronic cooler is connected with a fourth water outlet through a first flow cut-off device.
The detection gas path for measuring the automobile exhaust also comprises a zero gas inlet, an inspection gas inlet and a calibration gas inlet, wherein the zero gas inlet, the inspection gas inlet and the calibration gas inlet are respectively connected with a second two-way electromagnetic valve, a third two-way electromagnetic valve and a fourth two-way electromagnetic valve,
the second two-way electromagnetic valve, the third two-way electromagnetic valve and the fourth two-way electromagnetic valve are connected with the NOx gas analysis optical platform through a third one-way valve;
the second two-way electromagnetic valve, the third two-way electromagnetic valve and the fourth two-way electromagnetic valve are connected with the HC/CO/CO2 gas analysis optical platform through a fourth one-way valve.
The utility model discloses a measure automobile exhaust's detection gas circuit has set up dust particle material and vapor in the multi-stage filtration gets rid of the sample gas to set up the electronic cooler, guarantee to detect the temperature stability when gaseous when measuring, make measuring environment unanimous relatively at every turn, thereby measuring result good reproducibility. The leakage detection and the environmental air inspection can be automatically completed before starting up and measuring each time; and the back flushing cleaning can be automatically completed after one vehicle is detected. High automation degree, simple operation and high efficiency.
Drawings
Fig. 1 is a schematic diagram of a detection gas circuit for measuring automobile exhaust.
Detailed Description
The following describes a detection gas circuit for measuring automobile exhaust in detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 shows that a detection gas circuit for measuring automobile exhaust comprises an exhaust gas collection device 1 and a blowback compressed air source 14, the exhaust gas collection device 1 is connected with a pre-filter 2, the pre-filter 2 is connected with a physical condenser 4 through a water filter 3, the physical condenser 4 is connected with a water separator 5, wherein the water separator 5 is respectively connected with a first three-way electromagnetic valve 11 and a second three-way electromagnetic valve 12,
the first three-way electromagnetic valve 11 is connected with the first air pump 8, and the first air pump 8 is connected with the second water outlet 10 through the first one-way valve 9; the first air pump 8 is communicated with the physical condenser 4;
the second three-way electromagnetic valve 12 is connected with a second fiber filter screen 16, the second fiber filter screen 16 is connected with a second air pump 17 through a pressure sensor 36, the second air pump 17 is connected with a second electronic cooler 18, the second electronic cooler 18 is connected with an HC/CO/CO2 gas analysis optical platform 22 through a fifth one-way valve 21, and the HC/CO/CO2 gas analysis optical platform 22 is connected with a first exhaust port 24 through an oxygen sensor 23;
wherein the water filter 3 is connected with a first drain outlet 7 through a third three-way electromagnetic valve 6
Wherein, the first three-way solenoid valve 11 and the second three-way solenoid valve 12 are connected with an ambient air inlet through a first water separator 13.
And the blowback compressed air source 14 is connected with the second three-way electromagnetic valve 12 through a fifth two-way electromagnetic valve 15.
The second air pump 17 is connected with a first electronic cooler 25, the first electronic cooler 25 is connected with a NOx gas analysis optical platform 29 through a second one-way valve 28, the NOx gas analysis optical platform 29 is connected with a second air outlet 30, and the first electronic cooler 25 is connected with a fourth water outlet 27 through a first cut-off device 26.
The detection gas path for measuring the automobile exhaust also comprises a zero gas inlet, an inspection gas inlet and a calibration gas inlet, wherein the zero gas inlet, the inspection gas inlet and the calibration gas inlet are respectively connected with a second two-way electromagnetic valve 31, a third two-way electromagnetic valve 32 and a fourth two-way electromagnetic valve 33,
the second two-way electromagnetic valve 31, the third two-way electromagnetic valve 32 and the fourth two-way electromagnetic valve 33 are connected with the NOx gas analysis optical platform 29 through a third one-way valve 34;
the second two-way electromagnetic valve 31, the third two-way electromagnetic valve 32 and the fourth two-way electromagnetic valve 33 are connected with the HC/CO/CO2 gas analysis optical platform 22 through a fourth one-way valve 35.
The air pump in the gas circuit is opened alright make the sample gas collection system extraction sample gas of gas circuit front end get into and detect the gas circuit, and the sample gas gets rid of dust, particulate matter and vapor in the sample gas through leading filter, water filter, physics condenser, water separator, electron cooler in proper order, reentrant gas analysis optical platform to improve measurement accuracy.
The gas circuit is also provided with an ambient air inlet, a zero gas inlet, a calibration gas inlet, an inspection gas inlet and a compressed air inlet, and the switching of each branch gas circuit in the gas circuit is controlled by opening and closing a two-way electromagnetic valve and a three-way electromagnetic valve in the gas circuit, so that the automatic leak detection, the automatic correction and the automatic back flushing cleaning are realized. Therefore, the detection gas circuit can realize automatic detection, and has accurate measurement and convenient operation.
The method can ensure that the physical response time of measurement is less than or equal to 8s, the sampling is rapid, the real-time performance is good, the measurement of various detection working conditions can be met, and the method meets the requirements of a series of international and national standards such as GB18285-2018, GB3847-2018 and the like. Meanwhile, an air pump with stable flow is adopted, the whole air path keeps air tightness, and meanwhile, an electronic condenser is arranged in the measuring air path, so that the temperature stability of the detected air during measurement can be ensured, the measurement environment is relatively consistent every time, and the repeatability of the measurement result is good.
The high-efficiency back-flushing cleaning unit is arranged, the high-speed compressed air is used for cleaning the sampling pipeline, and residual pollutants in the air path are removed, so that the accuracy of the measuring result is ensured. The tail gas is filtered by multiple stages before measurement, so that the measurement precision can be ensured, the pollution of a rear-stage element is reduced, and the service life is prolonged.
The switching of each branch gas circuit is realized through the opening of the electromagnetic valve, and the automation of the detection process is realized. And can measure CO, CO2, HC, O2 and NOx in the tail gas of the gasoline vehicle and the diesel vehicle, and the full measurement precision is high.
Examples
1) And (3) measuring state:
after the instrument is electrified, the air pump is started, the detection pipeline is in a negative pressure state, and the sample gas collection device can extract tail gas in the automobile exhaust pipe. The extracted sample gas is firstly filtered by a first three-way electromagnetic valve prefilter to remove part of water and particles in the sample gas, and then is filtered by a second three-way electromagnetic valve water filter. Two metal columns connected with a control circuit of the third three-way electromagnetic valve are arranged in the second three-way electromagnetic valve water filter, and when the height of the filtered water reaches the bottom of the metal columns, the opening of the first two-way electromagnetic valve can be triggered to discharge the water in the water filter; the first and second electromagnetic valves return to a closed state after the water is discharged, so that the air tightness of the air path is ensured. The sample gas continues to pass through the physical condenser and the water separator with the dust filter to continuously remove water vapor and dust particles in the sample gas, and the condensed water and the filtered water are directly discharged out of the instrument by the air pump. The sample gas is divided into two paths after passing through the second air pump, and the two paths are respectively led to the N0x gas analysis optical platform and the HC/CO/CO2 gas analysis optical platform for gas component detection, and finally discharged out of the instrument. Because the gas analysis optical platform is sensitive to water vapor, even a small amount of water vapor can influence the detection result, before the sample gas enters the gas chamber, an electronic cooler is respectively added to remove the water vapor in the sample gas. For relatively low accuracy requirements, the electronic cooler here can be removed accordingly.
Because the gas analysis optical platform is sensitive to water vapor, even a small amount of water vapor affects the detection result, before the sample gas enters the gas chamber, an electronic cooler LQ1/LQ2 is respectively added to remove the water vapor in the sample gas; and the temperature stability of the detection gas during measurement can be ensured, so that the measurement environment is relatively consistent every time, and the repeatability of the measurement result is good. For relatively low accuracy requirements, the electronic cooler here can be removed accordingly. For example, when the tail gas of the diesel vehicle is detected or the gasoline vehicle is detected by a steady-state working condition method, the removal of the LQ2 electronic cooler can also meet the corresponding detection precision requirement.
The first three-way electromagnetic valve prefilter can only remove a small amount of dust, and the second three-way electromagnetic valve prefilter can filter out a large amount of water, so that the first two-way electromagnetic valve is arranged at the water discharge port of the prefilter to control water discharge. The water filtered by the physical condenser and the water separator with the dust filter is pumped out by a water pump.
The pressure sensor is connected in the gas path in a branch mode, is used for detecting the gas pressure in the gas path, and is used for detecting leakage and judging whether abnormal conditions such as blockage exist in the detection gas path. Before the detector is used each time, the gas circuit must be subjected to leak detection.
2) And (3) leak detection state:
the sample gas collecting device is plugged by a plug head, the first air pump and the second air pump are started to vacuumize the gas path system, the vacuum pump stops after the sample gas is pumped to a certain pressure, the sample gas collecting device enters a leak detection state, and the pipeline pressure sensor is used for detecting the change of the pipeline pressure to detect the leak.
3) A back flushing state:
because every time a vehicle is detected, automobile exhaust detected in the previous time can be remained in the detection gas circuit, and the detection result is inevitably influenced if the gas circuit is not cleaned and the next vehicle is detected. This requires that the gas path must be cleaned before each test. Therefore, a back-flushing cleaning device must be arranged on the air path.
A back-blowing compressed air source is connected between the outlet of the water separator and the inlet of the air pump in a branch mode, and a fifth two-way electromagnetic valve is additionally arranged at the position where the back-blowing compressed air source is connected into the air circuit and used for controlling the connection and disconnection of compressed air. A three-way electromagnetic valve is arranged on a main pipeline between the compressed air access point and the inlet of the air pump, and the inlet of the bypass is connected with the water separator and the ambient air inlet. In order to allow more compressed air to enter the tail gas collecting device, a three-way electromagnetic valve is arranged on a water discharge pipeline of the water separator and used for switching the pipeline into ambient air in a back flushing state.
The first three-way electromagnetic valve and the second three-way electromagnetic valve are started, the drainage pipeline and the main air pipeline of the water separator are switched to an off state, the fifth two-way electromagnetic valve is started to connect the back-blowing compressed air source air pipeline, and compressed air is ejected from the sample gas collecting device at a high speed due to the fact that the main air pipeline is disconnected, and the purpose of cleaning the air pipeline and the sampling device is achieved. The back flushing has the function of clearing sample gas and pollutants remained in the detection gas circuit in the last detection so as to avoid influencing the next detection and ensure that the detection result is more accurate.
4) Calibrating and zeroing:
because the automobile exhaust gas tester must be calibrated before each use, and the automobile needs to be zeroed after each detection, an automatic calibration zeroing function must be added in the detection gas path.
In order to realize the function, a zero gas inlet, an inspection gas inlet and a calibration gas inlet are connected in front of a gas inlet of the gas analysis optical platform, and a second two-way electromagnetic valve, a third two-way electromagnetic valve and a fourth two-way electromagnetic valve are respectively arranged at the three inlets to control the opening and switching of the inlets. In order to prevent the detection gas from entering the calibration zero setting gas path in the detection state, a third one-way valve and a fourth one-way valve are arranged on the branch gas path; in order to avoid the calibration zero setting state, calibration gas enters the air pump, and a first one-way valve and a second one-way valve are arranged on the main air path. The calibration gas inlet, the inspection gas inlet and the zero gas inlet are respectively connected with a fourth two-way electromagnetic valve, a third two-way electromagnetic valve and a second two-way electromagnetic valve of the two-way electromagnetic valve, and the electromagnetic valves are used for controlling the connection and the closing of the gas circuit. Three gas paths are connected with a main path and then divided into two paths to be respectively connected with two gas analysis optical platforms for calibration and zero setting. In order to ensure that the inspection gas is completely introduced into the optical platform, the front ends of the access points are provided with one-way valves. The first air pump and the second air pump are closed, the switching of the inspection air paths is realized by opening the electromagnetic valves of the corresponding air paths, and the zero setting and the inspection debugging of the calibration of the optical platform are realized.
And when the calibration is zero, the working state of the electromagnetic valve is shown in the table 1.
5) And (3) checking ambient air: and the first air pump and the second air pump are opened, the first three-way electromagnetic valve and the second three-way electromagnetic valve are electrified and switched to a bypass, ambient air is pumped to the gas analysis optical platform, and the concentration of HC/CO/CO2/NOx in ambient background air is measured. If any pollutant exceeds the standard, the instrument is locked, and subsequent emission detection cannot be carried out.
The detection process of the automobile exhaust comprises the following steps: the method comprises the steps of starting an instrument, preheating, detecting leakage, zeroing, detecting ambient air, measuring, back flushing and cleaning, measuring and back flushing and cleaning.
The automation of the detection process can be realized by controlling the opening of the electromagnetic valve.
Table 1 shows the control of the solenoid valve and the vacuum pump in various operating states
The first three-way electromagnetic valve and the second three-way electromagnetic valve are two-position three-way electromagnetic valves, the second two-way electromagnetic valve, the third two-way electromagnetic valve, the fourth two-way electromagnetic valve and the fifth two-way electromagnetic valve are direct-acting two-way electromagnetic valves, 0' indicates that the power-on action is not carried out, the direct-acting two-way electromagnetic valves are closed at the moment, an air inlet of the two-position three-way electromagnetic valve is connected at the normally open end, and a bypass is that an; the '1' represents the power-on action, at the moment, the direct-acting two-way electromagnetic valve is opened, the air inlet of the two-position three-way electromagnetic valve is closed, and the bypass ambient air inlet is opened.
Finally, it should be noted that the above examples are only intended to describe the technical solutions of the present invention and not to limit the technical methods, the present invention can be extended in application to other modifications, variations, applications and embodiments, and therefore all such modifications, variations, applications, embodiments are considered to be within the spirit and teaching scope of the present invention.

Claims (4)

1. A detection gas circuit for measuring automobile exhaust comprises an exhaust gas collection device (1), a water filter (3), a physical condenser (4), a water separator (5), a gas pump, an electronic cooler, an electromagnetic valve and a gas analysis optical platform, and is characterized in that the exhaust gas collection device (1) is connected with a pre-filter (2), the pre-filter (2) is connected with the physical condenser (4) through the water filter (3), the physical condenser (4) is connected with the water separator (5), the water separator (5) is respectively connected with a first three-way electromagnetic valve (11) and a second three-way electromagnetic valve (12), the first three-way electromagnetic valve (11) is connected with a first gas pump (8), and the first gas pump (8) is connected with a second water outlet (10) through a first one-way valve (9); the first air pump (8) is communicated with the physical condenser (4);
the second three-way electromagnetic valve (12) is connected with a second fiber filter screen (16), the second fiber filter screen (16) is connected with a second air pump (17) through a pressure sensor (36), the second air pump (17) is connected with a second electronic cooler (18), the second electronic cooler (18) is connected with an HC/CO/CO2 gas analysis optical platform (22) through a fifth one-way valve (21), and the HC/CO/CO2 gas analysis optical platform (22) is connected with a first exhaust port (24) through an oxygen sensor (23);
wherein the water filter (3) is connected with a first drainage port (7) through a third three-way electromagnetic valve (6);
the first three-way electromagnetic valve (11) and the second three-way electromagnetic valve (12) are connected with an ambient air inlet through a first water separator (13).
2. The detection gas circuit for measuring the automobile exhaust according to claim 1, wherein the blowback compressed air source (14) is connected to the second three-way solenoid valve (12) through a fifth two-way solenoid valve (15).
3. The detection gas circuit for measuring the automobile exhaust according to claim 1, wherein the second gas pump (17) is connected to a first electronic cooler (25), the first electronic cooler (25) is connected to a NOx gas analysis optical platform (29) through a second one-way valve (28), the NOx gas analysis optical platform (29) is connected to a second exhaust port (30), and wherein the first electronic cooler (25) is connected to the fourth exhaust port (27) through a first cut-off device (26).
4. The detection gas circuit for measuring the automobile exhaust according to claim 1, further comprising a zero gas inlet, an inspection gas inlet and a calibration gas inlet, wherein the zero gas inlet, the inspection gas inlet and the calibration gas inlet are respectively connected to a second two-way solenoid valve (31), a third two-way solenoid valve (32) and a fourth two-way solenoid valve (33), and the second two-way solenoid valve (31), the third two-way solenoid valve (32) and the fourth two-way solenoid valve (33) are connected to the NOx gas analysis optical platform (29) through a third one-way valve (34);
the second two-way electromagnetic valve (31), the third two-way electromagnetic valve (32) and the fourth two-way electromagnetic valve (33) are connected with the HC/CO/CO2 gas analysis optical platform (22) through a fourth one-way valve (35).
CN201921712357.7U 2019-10-14 2019-10-14 Detection gas circuit for measuring automobile exhaust Active CN211478081U (en)

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Application Number Priority Date Filing Date Title
CN201921712357.7U CN211478081U (en) 2019-10-14 2019-10-14 Detection gas circuit for measuring automobile exhaust

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921712357.7U CN211478081U (en) 2019-10-14 2019-10-14 Detection gas circuit for measuring automobile exhaust

Publications (1)

Publication Number Publication Date
CN211478081U true CN211478081U (en) 2020-09-11

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Application Number Title Priority Date Filing Date
CN201921712357.7U Active CN211478081U (en) 2019-10-14 2019-10-14 Detection gas circuit for measuring automobile exhaust

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