CN211785096U - Dynamic calibrating device of tail gas remote sensing detector - Google Patents
Dynamic calibrating device of tail gas remote sensing detector Download PDFInfo
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- CN211785096U CN211785096U CN201922438873.1U CN201922438873U CN211785096U CN 211785096 U CN211785096 U CN 211785096U CN 201922438873 U CN201922438873 U CN 201922438873U CN 211785096 U CN211785096 U CN 211785096U
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Abstract
A dynamic calibrating device of an exhaust remote sensing detector comprises: a support frame; the detection cavity is arranged on the support frame, one end of the detection cavity is open, and the other opposite end of the detection cavity is provided with a light through port; the light blocking sheet is operably arranged at the front end of the light through opening and is used for blocking or exposing the light through opening; and the jetting mechanism comprises a plurality of gas nozzles, and the plurality of gas nozzles are arranged along the periphery of the light through port and are used for jetting verification gas into the verification cavity. The jet mechanism of the dynamic verification device jets verification gas into the verification cavity to simulate the tail gas flowing state of the motor vehicle during running, so that the dynamic verification of the tail gas remote sensing detector is realized.
Description
Technical Field
The utility model relates to a metrological verification field, concretely relates to tail gas remote sensing detector's developments calibrating installation.
Background
The remote sensing detection system can detect and analyze the tail gas of the motor vehicle, has the advantages of high detection speed, high detection efficiency, no influence on the normal running of the vehicle, high automation degree and the like, and is one of the most widely applied motor vehicle tail gas detection methods at present. The working principle of the remote sensing detector for the tail gas of the motor vehicle is that when the detection light emitted by the detection light source passes through the tail gas of the motor vehicle, CO and CO in the tail gas2Substances such as HC and the like absorb different spectra, and the concentration of each pollutant can be quantitatively analyzed through the spectral change received by the light receiver.
The method for detecting the automobile exhaust is a commonly used method at present, but whether the exhaust value detected by the remote exhaust sensing detector is accurate and reliable needs to be verified. Therefore, special verification can be performed under a verification environment only when the tail gas remote sensing detection equipment leaves a factory, field verification in a working environment of the tail gas remote sensing equipment is far impossible, certain errors exist, and meanwhile, regular detection and maintenance after the tail gas remote sensing equipment is put into use are inconvenient. In addition, a calibration device capable of calibrating the remote exhaust gas sensor on site is also developed, but the existing calibration device is used for calibrating in a static state, namely, a calibration gas is in a static state, and the remote exhaust gas sensor is generally applied to occasions that a motor vehicle runs at a higher speed and exhaust gas is in a flowing state, so that the calibration device cannot simulate the actual condition of exhaust gas emission of the motor vehicle, and calibration errors can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tail gas remote sensing detector's developments calibrating installation to carry out the developments examination to tail gas remote sensing detector.
An aspect of the utility model provides a dynamic calibrating installation of tail gas remote sensing detector, include:
a support frame;
the detection cavity is arranged on the support frame, one end of the detection cavity is open, and the other opposite end of the detection cavity is provided with a light through port;
the light blocking sheet is operably arranged at the front end of the light through opening and is used for blocking or exposing the light through opening;
and the injection mechanism comprises a plurality of gas nozzles, and the plurality of gas nozzles are arranged on the periphery of the light through port and used for injecting verification gas into the verification cavity.
Preferably, the plurality of air nozzles are uniformly distributed along the periphery of the light through port, the spraying direction of each air nozzle and the central axis of the light through port form the same included angle, and the spraying directions of the air nozzles are intersected at one point.
Preferably, the ejection directions of the respective air ejection ports intersect at a point within the assay chamber.
Preferably, the dynamic calibration device of the remote tail gas sensing detector further comprises a containing chamber, the containing chamber is respectively connected with the support frame and the calibration cavity, a plurality of air inlet interfaces are arranged on the side wall of the containing chamber, each air inlet interface is used for being connected with a calibration gas source, and each air inlet interface is connected with the plurality of air nozzles through an air passage.
Preferably, the spraying mechanism further comprises an air pump, and the air pump is arranged on the air passage and used for pumping the verification gas to the plurality of air nozzles.
Preferably, the support frame comprises a bottom support, a vertical rod and an adjusting knob connected to the vertical rod, the accommodating chamber is connected to the vertical rod through the adjusting knob, and the bottom support comprises a first cross rod and a second cross rod hinged to the vertical rod.
Preferably, the dynamic calibration device of the remote tail gas sensing detector further comprises a laser, the laser is arranged on the side wall of the calibration cavity and close to the light through port, and the optical axis direction of the laser is parallel to the axial direction of the light through port.
Preferably, the dynamic calibration device of the remote exhaust gas sensing detector further comprises a battery, and the battery is detachably mounted in the accommodating chamber through a sliding bayonet arranged on the side wall of the accommodating chamber.
Preferably, the dynamic calibration device of the remote exhaust gas sensing detector further comprises a control unit, wherein the control unit is respectively in signal connection with the light blocking sheet and the injection mechanism, and is used for controlling the movement of the light blocking sheet to shield or expose the light through port and controlling the injection mechanism to inject the calibration gas into the calibration cavity.
Preferably, an exhaust fan is arranged in the verification cavity.
The beneficial effects of the utility model reside in that: one end of a verification cavity of the dynamic verification device is open, the other end of the verification cavity is provided with a light through hole, and the verification gas is sprayed into the verification cavity by the spraying mechanism so as to simulate the tail gas flowing state when a motor vehicle runs, thereby realizing the dynamic verification of the tail gas remote sensing detector.
The apparatus of the present invention has other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention with reference to the attached drawings, in which like reference numerals generally represent like parts in exemplary embodiments of the present invention.
Fig. 1 shows a schematic structural diagram of a dynamic calibration device of an exhaust remote sensing detector according to an embodiment of the present invention;
fig. 2 shows the internal structure diagram of the calibration cavity and the holding chamber of the dynamic calibration device of the remote exhaust gas sensing detector according to the embodiment of the present invention.
Description of reference numerals:
1 support frame, 101 montant, 102 supporting legss, 103 first horizontal pole, 104 second horizontal pole, 2 examination chamber, 201 logical light mouth, 202 air jet, 203 air discharge fan, 3 accommodation chamber, 301 interface that admits air, 302 air flue, 303 flow controller, 4 lasers, 5 slip bayonets.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the utility model provides a tail gas remote sensing detector's dynamic calibrating installation, include:
a support frame;
the detection cavity is arranged on the support frame, one end of the detection cavity is open, and the other opposite end of the detection cavity is provided with a light through port;
the light blocking sheet is operably arranged at the front end of the light through opening and is used for blocking or exposing the light through opening;
and the jetting mechanism comprises a plurality of gas nozzles, and the plurality of gas nozzles are arranged along the periphery of the light through port and are used for jetting verification gas into the verification cavity.
When the detection of the exhaust remote sensing detector is carried out, firstly, the detection light of the exhaust remote sensing detector is aligned to the light through port. And then, closing the light blocking sheet, blocking the detection light emitted by the tail gas remote sensing detector, simulating the automobile to run through, simultaneously controlling the injection mechanism to inject the verification gas into the verification cavity, and controlling the light blocking sheet to expose the light through port to simulate the automobile tail gas to pass through when the injected verification gas reaches a set value. The detection light of the tail gas remote sensing detector penetrates through the light-transmitting port to be emitted from the open end of the calibration cavity, and the tail gas remote sensing detector can determine the gas concentration according to the spectral change received by the light receiver of the tail gas remote sensing detector; the detected gas concentration is obtained. And calculating the indicating value error according to the detected gas concentration and the gas concentration of the verification gas. The utility model discloses in, it is open to examine and determine chamber one end, and the other end sets up logical unthreaded hole, and injection mechanism will examine and determine gaseous injection to examine and determine the intracavity to tail gas flow state when simulation motor vehicle traveles, thereby realize the dynamic examination of tail gas remote sensing detector.
Fig. 1 shows according to the utility model discloses tail gas remote sensing detector's dynamic verification device's schematic structure diagram, fig. 2 shows according to the utility model discloses tail gas remote sensing detector's dynamic verification device's internal structure chart of examination chamber and accommodation chamber.
Referring to fig. 1 and 2, the dynamic calibration device of the remote exhaust gas sensing detector comprises:
a support frame 1;
the detection chamber 2 is arranged on the support frame 1, one end of the detection chamber 2 is open, and the other opposite end is provided with a light through port 201;
a light blocking sheet (not shown) operatively disposed at a front end of the light passing port 201 for blocking or exposing the light passing port 201;
and the injection mechanism comprises a plurality of gas nozzles 202, and the plurality of gas nozzles 202 are arranged along the periphery of the light through port and are used for injecting the verification gas into the verification cavity 2.
Wherein, a plurality of air jet ports 202 are evenly distributed along the periphery of the light through port 201, the jet direction of each air jet port 202 and the central axis of the light through port 201 form the same included angle, and the jet directions of the air jet ports 202 are intersected at one point. Preferably, the ejection directions of the respective air ejection ports 202 intersect at a point within the assay chamber 2. The state of the automobile exhaust pipe when tail gas is sprayed can be simulated by forming an included angle between the spraying direction of the gas spraying port 202 and the central axis of the light through port 201, and the accuracy of dynamic verification is improved.
The dynamic verification device further comprises a containing chamber 3, the containing chamber 3 is respectively connected with the support frame 1 and the verification cavity 2, a plurality of air inlet interfaces 301 are arranged on the side wall of the containing chamber 3, each air inlet interface 301 is used for being connected with a verification gas source, and each air inlet interface 301 is connected with a plurality of air nozzles 202 through an air passage 302.
The calibration unit is also provided with a solenoid valve (not shown) for controlling the ventilation. The solenoid valve may control ventilation in a timed or a metered mode.
The support frame 1 comprises a bottom support, a vertical rod 101 and an adjusting knob connected to the vertical rod 101, the accommodating chamber 3 is connected to the vertical rod 101 through the adjusting knob, and the bottom support comprises a first cross rod 103 and a second cross rod 104 hinged to the vertical rod 101. The bottom of the vertical rod 101, the first cross rod 103 and the second cross rod 104 are provided with supporting feet 102. By adjusting the angle between the first cross bar 103 and the second cross bar 104, the support stand 1 can be stabilized. The adjusting knob is used for adjusting the height and the angle of the accommodating chamber 3 on the vertical rod 101 so as to meet the requirements of tail gas remote sensing detectors of different types and specifications. The adjustment knob may be implemented by various means known to those skilled in the art and will not be described in detail herein.
The dynamic calibration device of the tail gas remote sensing detector further comprises a laser device 4, the laser device 4 is arranged on the side wall of the calibration cavity 2 and is close to the light through port 201, the optical axis direction of the laser device 4 is parallel to the axial direction of the light through port 201, laser emitted by the laser device 4 can irradiate the tail gas remote sensing detector, and the dynamic calibration device and the tail gas remote sensing detector are quickly aligned.
The dynamic calibration device of the tail gas remote sensing detector further comprises a control unit and a touch panel. The control unit is respectively in signal connection with the light blocking sheet and the injection mechanism and is used for controlling the movement of the light blocking sheet to shield or expose the light through port and controlling the injection mechanism to inject the verification gas into the verification cavity. Preferably, the light blocking plate may be hinged to the outer wall of the assay chamber 2, and the control unit controls the motor to drive the light blocking plate to rotate so as to block or expose the light passing port 201. The control unit can control the start and stop of the air pump and spray or stop spraying the verification gas into the verification cavity. The touch panel is disposed on the sidewall of the accommodating chamber 3, and is used for starting and stopping the dynamic verification device, and setting parameters of the verification gas, such as flow rate and ventilation.
In this embodiment, the side wall of the calibration chamber 2 may be provided with an exhaust hole, the calibration chamber 2 may be provided with an exhaust fan 203, and when the calibration gas in the calibration chamber 2 needs to be discharged, the exhaust hole may be opened, the exhaust fan 203 is opened, and the calibration gas is rapidly discharged.
The dynamic calibration device of the tail gas remote sensing detector further comprises a battery, the battery can be a portable battery, the battery can be detachably mounted in the accommodating chamber 3 through a sliding bayonet 5 arranged on the side wall of the accommodating chamber 3, and calibration work can be performed under the condition that no power supply exists in a road environment. The battery is used for supplying power to electronic devices such as the air pump, the control unit and the touch display panel.
The dynamic verification method using the dynamic verification device comprises the following steps:
step 1: the detection light of the tail gas remote sensing detector is aligned to the light through port;
step 2: closing the light blocking sheet, and simultaneously controlling the spraying mechanism to spray the verification gas into the verification cavity;
and step 3: controlling the light blocking sheet to expose the light through port so that the detection light passes through the detection cavity;
and 4, step 4: acquiring the gas concentration detected by an exhaust remote sensing detector;
and 5: and calculating the indicating value error according to the detected gas concentration and the gas concentration of the verification gas.
In step 1, the laser and the tail gas remote sensing detector can be started, the height and the angle of the verification cavity relative to the support frame are adjusted through the adjusting knob, laser emitted by the laser is enabled to be parallel to detection light of the tail gas remote sensing detector, and detection light of the tail gas remote sensing detector is enabled to be aligned to the light through port, so that rapid alignment of the tail gas remote sensing detector and the dynamic verification device is achieved.
In order to simulate the flow of the tail gas of the motor vehicle, the flow speed of the gas sprayed by the spraying mechanism is controlled to be 10-30L/min, preferably 20L/min in the step 2 through repeated tests. The flow rate of the injected gas may be controlled by the flow controller 303.
Preferably, in step 3, when the injected verification gas reaches a set value, the light blocking sheet is controlled to expose the light through port, so as to ensure that the gas concentration in the verification chamber reaches a certain standard, and improve the verification accuracy.
In addition, in order to improve the accuracy of the dynamic verification, the steps 2 to 4 are repeatedly executed, and the average value of the gas concentration detected for a plurality of times is calculated; in step 5, an indication error is calculated according to formula (1) and formula (2):
where, Δ represents the absolute indication error,
represents the average value of the gas concentrations detected a number of times, CsIndicating the gas concentration of the assay gas and indicating the relative indication error.
Preferably, the test can be repeated 3-5 times and the average of the gas concentrations for the multiple tests is calculated.
In addition, the indication error of the remote exhaust gas sensing detector for different types of detection gas can be detected. And for one type of verification gas, after completing the dynamic verification of the tail gas remote sensing detector according to the steps 1 to 4, emptying the verification gas in the verification cavity, repeatedly executing the steps 2 to 4, and completing the dynamic verification of the tail gas remote sensing detector for the other type of verification gas.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a dynamic calibrating installation of tail gas remote sensing detector which characterized in that includes:
a support frame;
the detection cavity is arranged on the support frame, one end of the detection cavity is open, and the other opposite end of the detection cavity is provided with a light through port;
the light blocking sheet is operably arranged at the front end of the light through opening and is used for blocking or exposing the light through opening;
and the injection mechanism comprises a plurality of gas nozzles, and the plurality of gas nozzles are arranged on the periphery of the light through port and used for injecting verification gas into the verification cavity.
2. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 1, wherein the plurality of air nozzles are uniformly distributed along the periphery of the light through port, the injection direction of each air nozzle forms the same included angle with the central axis of the light through port, and the injection directions of the air nozzles intersect at one point.
3. The dynamic calibration device of the remote exhaust gas sensing instrument according to claim 2, wherein the jetting directions of the air nozzles intersect at a point in the calibration cavity.
4. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 1, further comprising a housing chamber, wherein the housing chamber is respectively connected with the support frame and the calibration cavity, a plurality of air inlet interfaces are arranged on a side wall of the housing chamber, each air inlet interface is used for being connected with a calibration gas source, and each air inlet interface is connected with the plurality of air nozzles through an air passage.
5. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 4, wherein the injection mechanism further comprises an air pump, and the air pump is arranged on the air passage and used for pumping the calibration gas to the plurality of air nozzles.
6. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 4, wherein the support frame comprises a bottom bracket, a vertical rod and an adjusting knob connected to the vertical rod, the accommodating chamber is connected to the vertical rod through the adjusting knob, and the bottom bracket comprises a first cross rod and a second cross rod hinged to the vertical rod.
7. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 1, further comprising a laser, wherein the laser is arranged on the side wall of the calibration cavity and close to the light through port, and the optical axis direction of the laser is parallel to the axial direction of the light through port.
8. The dynamic calibration device of the remote exhaust gas sensing instrument according to claim 4, further comprising a battery detachably mounted in the accommodating chamber through a sliding bayonet formed in a sidewall of the accommodating chamber.
9. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 1, further comprising a control unit, wherein the control unit is in signal connection with the light barrier and the injection mechanism respectively, and is configured to control the movement of the light barrier to shield or expose the light through port, and control the injection mechanism to inject the calibration gas into the calibration cavity.
10. The dynamic calibration device of the remote exhaust gas sensing detector according to claim 1, wherein an exhaust fan is arranged in the calibration cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922438873.1U CN211785096U (en) | 2019-12-30 | 2019-12-30 | Dynamic calibrating device of tail gas remote sensing detector |
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| CN201922438873.1U CN211785096U (en) | 2019-12-30 | 2019-12-30 | Dynamic calibrating device of tail gas remote sensing detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044468A (en) * | 2019-12-30 | 2020-04-21 | 北京市计量检测科学研究院 | Dynamic calibration device and method for tail gas remote sensing detector |
| CN114924031A (en) * | 2022-03-15 | 2022-08-19 | 江苏省计量科学研究院(江苏省能源计量数据中心) | Detection device of motor vehicle tail gas remote sensing monitoring system |
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2019
- 2019-12-30 CN CN201922438873.1U patent/CN211785096U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044468A (en) * | 2019-12-30 | 2020-04-21 | 北京市计量检测科学研究院 | Dynamic calibration device and method for tail gas remote sensing detector |
| CN114924031A (en) * | 2022-03-15 | 2022-08-19 | 江苏省计量科学研究院(江苏省能源计量数据中心) | Detection device of motor vehicle tail gas remote sensing monitoring system |
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