CN211553742U - Calibration device based on infrared absorption method tunnel carbon monoxide content detector - Google Patents
Calibration device based on infrared absorption method tunnel carbon monoxide content detector Download PDFInfo
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- CN211553742U CN211553742U CN201922256566.1U CN201922256566U CN211553742U CN 211553742 U CN211553742 U CN 211553742U CN 201922256566 U CN201922256566 U CN 201922256566U CN 211553742 U CN211553742 U CN 211553742U
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Abstract
A calibration device based on an infrared absorption method tunnel carbon monoxide content detector belongs to the field of carbon monoxide gas concentration detection in a tunnel environment, and comprises a carbon monoxide standard gas cylinder, an exhaust bag and a supporting device, wherein the carbon monoxide standard gas cylinder comprises a calcium fluoride window sheet, a quartz glass tube, a sealing ring, a gas valve and a flexible tube; design of carbon monoxide standard device. The utility model selects the window glass at the two ends of the standard device to ensure that the infrared ray of the corresponding wave band has the transmissivity as much as possible; eliminating the influence of other gases and dust particles in the air.
Description
Technical Field
The utility model belongs to the equipment that carbon monoxide gas concentration detected in the tunnel environment.
Background
Detector for carbon monoxide content in tunnel: the equipment which can be used for detecting the concentration of the carbon monoxide gas in the tunnel environment generally comprises a sensor, an analysis device, a display or transmission device and the like.
Infrared absorption: when the natural vibration frequency and rotation frequency of the molecule are the same as the frequency of a certain wave band in the infrared radiation, the molecule absorbs the infrared radiation of the wave band, so that the infrared radiation energy is converted into the molecular vibration and rotation kinetic energy.
With the continuous development of road traffic construction in China, more and more tunnels are used in road construction, and the maximum length of a single tunnel is continuously refreshed. However, the tunnel is used as a closed place, air flow and exchange are insufficient, so that the accumulation of tail gas discharged by an automobile is easily caused, the concentration of carbon monoxide is increased, and the safety of pedestrians and vehicles is seriously endangered. Therefore, it becomes necessary to realize a detection alarm for the concentration of carbon monoxide in the tunnel.
At present, a tunnel carbon monoxide content detector is generally used for detecting the concentration of tunnel carbon monoxide, and is distinguished according to the technical principle, and mainly comprises a non-dispersive infrared absorption method and an electrochemical method. The carbon monoxide content detector based on the electrochemical method determines the existence of longer reaction time by the working principle, in addition, because the working process can cause the reduction of the concentration of the carbon monoxide nearby, if the carbon monoxide concentration is detected accurately, measures should be taken to accelerate the circulation of the air nearby, a pumping mode is generally adopted at present, but the further problem brought by the pumping mode is the accelerated accumulation of dust particles in the air at an air inlet, the measures must be taken to filter, for the electrochemical carbon monoxide content detector used for a long time, the filter device must be replaced regularly, so that the use of the electrochemical carbon monoxide content detector is greatly limited.
The carbon monoxide content detector based on the non-dispersive infrared absorption method has the advantages of high sensitivity and precision, quick response, good selectivity, high reliability, long service life and the like, and in addition, the detector can share a light path and an optical device with visibility detection, so that the detector has a strong advantage in the aspect of tunnel carbon monoxide concentration detection. However, the electrochemical tunnel carbon monoxide content detector has the verification rules of similar products, the market of the electrochemical tunnel carbon monoxide content detector is relatively normalized, and the non-dispersive infrared absorption carbon monoxide content detector has no corresponding verification rule which can be referred to and has no mature calibration device. In order to standardize the use of the carbon monoxide content detector in the non-dispersive infrared absorption tunnel, a corresponding calibration device is urgently needed to be developed to carry out periodic calibration on the detector, so that the purpose of promoting the level of the related industry is promoted.
At present, no calibration device for an infrared absorption tunnel carbon monoxide content detector exists in China, but there are calibration devices for other gas detectors based on an infrared absorption method, such as a calibration device for a methane gas detection alarm based on the infrared absorption method, which is used for carrying out test verification on the methane gas detection alarm based on the infrared absorption method by making a methane gas cylinder with a specific standard value (LEL × m) as a standard device, so that the calibration device is proved to be accurate and effective and is approved by CNAS. However, due to differences in calibration environment, components of the gas to be calibrated and the structure of the product to be calibrated, the device cannot be directly used for calibrating the infrared absorption tunnel carbon monoxide content detector, and a special calibration device needs to be designed for calibrating the infrared absorption tunnel carbon monoxide content detector.
If the existing calibration device is adopted to calibrate the infrared absorption tunnel carbon monoxide content detector, the following defects exist:
1) the infrared band transmittance is reduced. The material selected by the standard device of the existing calibration device can greatly reduce the transmissivity of carbon monoxide gas corresponding to an infrared band;
2) is disturbed by other gases. Because the two ends of the standard device of the calibration device are not correspondingly processed, other gases and dust particles near the two ends of the standard device will cause interference and influence the detection precision of the carbon monoxide when the calibration device is used for tunnel field calibration;
3) resulting in material waste. Under the influence of the working principle, the calibration device has enough length, which will increase the material waste undoubtedly, and other measures should be taken to solve the problem;
4) the inlet and outlet are not properly designed. Under the influence of the detected gas density, the design of the inlet and the outlet of the existing calibration device becomes unreasonable, and the existing calibration device is redesigned according to the gas density relationship.
Disclosure of Invention
This patent calibrating device based on infrared absorption method tunnel carbon monoxide content detector mainly comprises carbon monoxide standard gas cylinder, exhaust bag and strutting arrangement, wherein the structural design of carbon monoxide standard gas cylinder and exhaust bag is proposed for the first time in relevant field for this patent, carbon monoxide standard gas cylinder is the uniqueness design of this patent, by calcium fluoride window piece, quartz glass tube, the sealing washer, the pneumatic valve, the flexible tube is constituteed, the exhaust bag is the structure of designing specially for realizing evacuation clearance gas, by the utricule, sealed clamping device and import and export are constituteed, strutting arrangement is by linear guide, erection support and adjustable support are constituteed, the holistic hardware connection of calibrating device is shown as figure 1.
The utility model provides a calibrating device based on infrared absorption method tunnel carbon monoxide content detector which characterized in that:
the device comprises a carbon monoxide standard gas cylinder, an exhaust bag and a supporting device, wherein the carbon monoxide standard gas cylinder comprises a calcium fluoride window sheet, a quartz glass tube, a sealing ring, a gas valve and a flexible tube;
the middle section of the carbon monoxide standard gas cylinder is a flexible pipe with openings at two ends, the inner pipe wall with openings at two ends is bonded with the outer edge of an annular sealing ring to ensure complete air tightness between the two, the annular sealing ring is sleeved at one end of a quartz glass pipe to form sealing, and the other end of the quartz glass pipe is tightly bonded with a calcium fluoride window sheet; the middle sections of the flexible tube and the quartz glass tube are provided with an inlet and an outlet, and the inlet and the outlet are provided with air valves;
the exhaust bag is in an ellipsoidal shape, openings are formed in two ends of the long shaft, one end of the exhaust bag is sleeved with the calibration equipment, and the other end of the exhaust bag is sleeved with the quartz glass tube of the carbon monoxide standard gas cylinder; the exhaust bag is provided with an air inlet and an exhaust port;
the carbon monoxide standard gas cylinder and the exhaust bag are coaxially arranged;
the linear guide rail is fixed on a flat workbench, 4 sliding blocks are arranged on the linear guide rail, 2 of the outer side are used for fixedly mounting the support, and 2 of the inner side are used for fixing the adjustable support and can slide and lock on the linear guide rail.
The method for applying the device is characterized in that:
respectively and tightly bonding the calcium fluoride window sheet, the quartz glass tube and the sealing ring with the flexible tube to ensure the air tightness; rotating the air valve knob to close the two air outlets; opening an air inlet, completely sucking the gas in the standard gas cylinder, and simultaneously closing an air valve of the air inlet; connecting a carbon monoxide standard gas bottle with a gas inlet, simultaneously opening a gas valve of the gas inlet, injecting carbon monoxide standard gas, stopping injecting the carbon monoxide standard gas after the flexible pipe is swelled, completely sucking the gas in the standard gas bottle, repeating the operation for 3-5 times, closing the gas valve of the gas inlet while injecting gas after the carbon monoxide standard gas is injected for the last time, and then stopping injecting gas;
the manufacturing processes of the carbon monoxide standard gas cylinder and the nitrogen gas cylinder with different concentrations are carried out in the same way until all the standard gas cylinders are manufactured;
installing a calibrating device to enable the optical axis of the detected equipment to be parallel to the linear guide rail; installing a nitrogen cylinder on an adjustable support, and adjusting the height of the support to enable the axis of the standard gas cylinder to be parallel to the optical axis of the detected equipment and to be at the same height;
inputting nitrogen into an exhaust bag, and preparing nitrogen blowing before calibration;
replacing a nitrogen cylinder with a carbon monoxide standard gas cylinder, and performing nitrogen blowing preparation and reading test; and replacing the carbon monoxide standard gas cylinder with the carbon monoxide standard gas cylinder in sequence, and performing nitrogen blowing preparation and reading test in the same way until the test is finished.
Design of carbon monoxide standard device. Selecting the type of window glass at two ends of the standard device so as to ensure that the infrared rays in corresponding wave bands have the transmissivity as large as possible; the size of the standard is lengthened, meanwhile, the material consumption is reduced, the portability is improved, and the middle section is designed to be a flexible standard.
Eliminating the influence of other gases and dust particles in the air. In the space between the two ends of the standard and the transmitting and receiving device, other gases and dust particles can absorb infrared rays in corresponding wave bands, and in order to eliminate the influence, the nitrogen blowing method is adopted for solving the problem.
Drawings
FIG. 1 is a schematic diagram showing hardware connection of a calibration device of a tunnel carbon monoxide content detector based on an infrared absorption method
In fig. 1, 1 is the tested equipment component, 2 is the inlet of the exhaust bag, so as to input high-purity nitrogen with nitrogen content greater than 99% into the exhaust bag, 3 is the air inlet, which is used for inputting carbon monoxide standard gas, and is provided with an air regulating valve, 4 is a quartz glass tube, 5 is a calcium fluoride window sheet, 6 is a flexible tube, the length of the flexible tube can be customized according to different installation distances of different detectors, 7 is a sealing ring, 8 is the air outlet, which is used for discharging miscellaneous gas when manufacturing the carbon monoxide standard gas cylinder, and is provided with an air regulating valve, and 9 is the air outlet of the exhaust bag, which is used for discharging miscellaneous gas inside the exhaust bag, 10 is an installation support, which is used for installing the tested equipment, 11 is a linear guide rail, and 12 is an adjustable support, which is used for vertical position regulation and.
FIG. 2 is a flow chart for manufacturing a standard carbon monoxide gas cylinder
FIG. 3 calibration device installation flow chart
FIG. 4 flow chart of nitrogen purge preparation before calibration
Figure 5 flow chart of nitrogen blowing preparation in the embodiment
Detailed Description
This patent calibrating device based on infrared absorption method tunnel carbon monoxide content detector is components of a whole that can function independently assembled, convenient to detach and equipment.
An infrared light source of a tunnel carbon monoxide content detector based on an infrared absorption method is generally emitted through a cylindrical shading cylinder, such as the detected equipment part shown in fig. 1.
The middle section of the carbon monoxide standard gas cylinder is a flexible pipe with two open ends, the inner pipe walls with two open ends are bonded with the outer edge of the annular sealing ring, complete air tightness between the two is ensured, the annular sealing ring is sleeved at one end of the quartz glass pipe to form static seal, and the other end of the quartz glass pipe is tightly bonded with the calcium fluoride window sheet. In addition, the middle sections of the flexible tube and the quartz glass tube are provided with an inlet and an outlet, and the inlet and the outlet are provided with air valves which have more than three-level air tightness in a closed state.
The calcium fluoride window sheet has low absorption coefficient, and the transmittance of the infrared absorption wave band corresponding to carbon monoxide gas can reach over 90 percent. The calcium fluoride window sheets are respectively arranged at two ends of the carbon monoxide standard gas cylinder, and the installation plane of the calcium fluoride window sheets is ensured to be vertical to the axis of the carbon monoxide standard gas cylinder. The calcium fluoride window sheet is round and 2mm thick.
The quartz glass tube is 60mm in fixed length, an exhaust port with the inner diameter of 3mm is arranged on the quartz glass tube and used for exhausting miscellaneous gas, and the exhaust port is provided with a regulating air valve, so that the quartz glass tube is opened and closed when a carbon monoxide standard gas cylinder is manufactured, and the gas tightness of more than three levels is ensured in a closed state.
The flexible pipe is generally made of flexible materials such as soft plastics or soft rubber, the flexible pipe is more beneficial to discharging miscellaneous gas, the length of the flexible pipe can be customized according to the installation distance of the detected equipment, an air inlet with the inner diameter of 6-10 mm is arranged in the middle of the flexible pipe, so that positive pressure is formed, gas backflow is prevented, an adjusting air valve is arranged on the air inlet, and similarly, the flexible pipe is opened and closed when a carbon monoxide standard gas cylinder is manufactured, and the gas tightness with more than three levels is ensured in a closed state.
The exhaust bag is in an ellipsoid shape, two ends of the long shaft are provided with round openings, one end of the exhaust bag is sleeved with the calibration equipment, and the other end of the exhaust bag is sleeved with the quartz glass tube of the carbon monoxide standard gas cylinder. The exhaust bag is made of flexible materials such as rubber, openings at two ends of the exhaust bag have elasticity, the elastic expansion ratio of the exhaust bag is designed to be 1.2-1.5 according to the requirement of actual calibration equipment so as to meet the connection requirement of detected equipment with different calibers, and the requirement of a connection part on air tightness is not strict. The exhaust bag is provided with an air inlet with the inner diameter of 6-8 mm and an exhaust outlet with the inner diameter of 3-4 mm, and positive pressure is conveniently formed due to the size design of the inner diameter, so that gas backflow at the air outlet is avoided. When the inlet and the outlet are arranged, the relationship between the air density and the nitrogen density is considered, and because the air density is close to the inlet and the outlet, and the air density is slightly higher than the nitrogen density, the air inlet is arranged above the inlet, and the air outlet is arranged below the inlet, so that the internal air is evacuated as soon as possible, and the high-purity state of the internal nitrogen is achieved.
In order to facilitate the coaxial installation of the detected equipment, the carbon monoxide standard gas cylinder and the exhaust bag, the calibration device of the tunnel carbon monoxide content detector based on the infrared absorption method further comprises a set of supporting devices.
The linear guide rail is generally fixed on a flat workbench, 4 sliding blocks are arranged on the linear guide rail, 2 on the outer side are used for fixedly mounting a support, and 2 on the inner side are used for fixing an adjustable support and can slide and lock on the linear guide rail. The linear guide rail is used for limiting related equipment to be on the same installation plane, the length of the linear guide rail is generally larger than the installation distance of the equipment to be detected, generally larger than 3m, and in order to guarantee rigidity, the linear guide rail with the groove-shaped section can be selected.
The mounting support is used for fixing the detected equipment so that the optical axis of the detected equipment is on a mounting plane. In addition, the mounting support is provided with an angle fine adjustment function, so that the optical axis of the detected equipment is parallel to the linear guide rail.
The adjustable support mainly realizes two functions, namely realizing the fixed installation of the adjustable support and the quartz glass tube, and realizing the parallel of the installation axis of the whole carbon monoxide standard gas cylinder and the linear guide rail through the adjustment of the vertical position.
After the parts of the calibration device and the installation process thereof are clarified, the following work mainly comprises the manufacture of the carbon monoxide standard gas cylinder, the nitrogen blowing preparation before calibration and the assembly of the calibration device, and then the manufactured carbon monoxide standard gas cylinder can be used for calibration.
This patent a calibrating device based on infrared absorption method tunnel carbon monoxide content detector contains 3 carbon monoxide standard gas cylinders and 1 high-purity nitrogen gas cylinder, and the preparation flow of carbon monoxide standard gas cylinder is like figure 2, and the reference can be analogized to high-purity nitrogen gas cylinder preparation flow.
And tightly bonding the calcium fluoride window sheet, the quartz glass tube and the sealing ring with the flexible tube respectively to ensure the air tightness. And then, connecting the sealing ring with the quartz glass tube, wherein the sealing ring is made of a material with smooth inner side and elastic expansion ratio of 1.2-1.5 so as to ensure the air tightness of the joint.
The air valve knob is rotated to close the two air outlets. And opening the air inlet, completely sucking the gas in the standard gas cylinder by using a suction mode such as pumping and the like, and closing an air valve of the air inlet. The carbon monoxide standard gas bottle is connected with the gas inlet, opens the gas inlet pneumatic valve simultaneously, pours into the carbon monoxide standard gas into the flexible pipe and swells the back, stops to pour into the carbon monoxide standard gas into to use modes such as pump suction with the inside gas of standard gas cylinder clean up, repeat 3 ~ 5 times so and be close to the carbon monoxide standard gas as far as in order to guarantee the inside gas of standard gas cylinder. After the last injection of the standard carbon monoxide gas, the gas inlet valve is closed while the gas is injected, and then the gas injection is stopped, and the flow is shown in fig. 2.
The manufacturing processes of the carbon monoxide standard gas cylinder and the high-purity nitrogen gas cylinder with different concentrations are carried out in the same way until all the standard gas cylinders are manufactured.
The installation of the calibration device should follow the installation order from bottom to top, from both sides to centre, and each part should be firmly and accurately installed.
In order to ensure the horizontal installation of the linear guide rail, a flat workbench is selected for calibration in an indoor environment, and a horizontal support is selected for assistance for calibration in an outdoor environment. After the linear guide rail is horizontally installed, the support is fixedly installed according to the installation distance required by the equipment, and the equipment to be detected is installed on the support. And the adjustable support is arranged according to the installation distance of the detected equipment, so that the uniform stress is ensured. And fixing the quartz glass tube to the adjustable support, and adjusting the height of the adjustable support to enable the optical axes of the standard gas bottle and the detected equipment to coincide. And finally, installing an exhaust bag, wherein the exhaust bag is made of an elastic material, the calibers of two ends of the exhaust bag can be changed within the range of 0.8-1.2 times of the diameter of the detected equipment extending out of the cylinder, one end of the exhaust bag is sleeved on the standard gas cylinder, and the other end of the exhaust bag is sleeved on the detected equipment. The installation flow chart is shown in fig. 3.
Injecting high-purity nitrogen into the exhaust bag from the air inlet, extruding the exhaust bag to evacuate the internal air as much as possible, blocking the air outlet when the extrusion reaches the limit, enabling the exhaust bag to recover the bulging state under the action of the air inlet, then extruding again, and performing the extrusion for 3-5 times so as to determine that the gas in the exhaust bag reaches the state of 99.999% of high-purity nitrogen, wherein the flow chart is shown in fig. 4.
A standard carbon monoxide cylinder and a high purity nitrogen cylinder were first made for later use as described previously.
And (5) installing the calibrating device according to the requirement of the calibrating environment condition, so that the optical axis of the detected equipment is parallel to the linear guide rail. And (3) mounting the high-purity nitrogen cylinder on an adjustable support, and adjusting the height of the support so that the axis of the standard gas cylinder is parallel to the optical axis of the equipment to be detected and is approximately at the same height.
High purity nitrogen gas is fed into the exhaust bladder for nitrogen blow preparation prior to calibration.
Test readings were taken every five seconds for a total of 5 readings and recorded.
A standard carbon monoxide cylinder 1 was used in place of the high purity nitrogen cylinder for nitrogen purge preparation and test readings. And then replacing the carbon monoxide standard gas cylinder 1 with the carbon monoxide standard gas cylinder 2 and the carbon monoxide standard gas cylinder 3 in sequence, and performing nitrogen blowing preparation and test reading in the same way until the test is finished.
This patent calibration device based on infrared absorption method tunnel carbon monoxide content detector provides the solution for the calibration of relevant product.
This patent has reduced the consumption of carbon monoxide standard gas through setting up the flexible tube and importing and exporting the design, has reduced the abandonment work load to the pollution to the environment has been reduced as far as possible, and simultaneously, flexible tube material is cheap relatively quartz glass, has reduced the material waste, and has reduced the size, the convenient transportation.
This patent adopts the window piece of high transmissivity to can carry out the customization of standard gas cylinder length according to instrument design installation distance, improve the calibration accuracy.
The interference of other gases or smoke and dust in the air has been got rid of to this patent, has further promoted the promotion that detects the precision.
This patent calibrating device can realize examining the on-the-spot calibration of equipment, has avoided the trouble that dismantlement equipment caused.
Based on the whole design scheme of calibrating device and the design theory of part of infrared absorption method tunnel carbon monoxide content detector, as follows:
the standard gas cylinder in the calibration device adopts a design scheme of combining a quartz glass tube and a flexible tube, so that the material waste is reduced, the size of components is reduced, and the transportation and the storage are convenient.
And (3) a gas injection scheme of a standard gas cylinder. The characteristic that the flexible pipe is convenient for exhaust is utilized, so that the evacuation of the gas in the standard gas cylinder can be realized without vacuumizing, and the working difficulty is weakened. At the same time, the venting scheme also brings a further benefit, namely, the reduction of standard gas consumption.
The gas injection method and the manufacturing process of the standard gas cylinder are relatively scientific.
The exhaust bag used in the nitrogen blowing method is made of elastic materials, is convenient to deform, and has openings at two ends with the opening degree of 1.2-1.5 times.
The size design of the air inlet and the air outlet of the air exhaust bag used by the nitrogen blowing method can keep the positive pressure inside the bag body and avoid the backflow of gas.
The nitrogen blowing method is a method for eliminating interference of other gases and smoke dust.
Claims (1)
1. The utility model provides a calibrating device based on infrared absorption method tunnel carbon monoxide content detector which characterized in that:
the device comprises a carbon monoxide standard gas cylinder, an exhaust bag and a supporting device, wherein the carbon monoxide standard gas cylinder comprises a calcium fluoride window sheet, a quartz glass tube, a sealing ring, a gas valve and a flexible tube;
the middle section of the carbon monoxide standard gas cylinder is a flexible pipe with openings at two ends, the inner pipe wall with openings at two ends is bonded with the outer edge of an annular sealing ring to ensure complete air tightness between the two, the annular sealing ring is sleeved at one end of a quartz glass pipe to form sealing, and the other end of the quartz glass pipe is tightly bonded with a calcium fluoride window sheet; the middle sections of the flexible tube and the quartz glass tube are provided with an inlet and an outlet, and the inlet and the outlet are provided with air valves;
the exhaust bag is in an ellipsoidal shape, openings are formed in two ends of the long shaft, one end of the exhaust bag is sleeved with the calibration equipment, and the other end of the exhaust bag is sleeved with the quartz glass tube of the carbon monoxide standard gas cylinder; the exhaust bag is provided with an air inlet and an exhaust port;
the carbon monoxide standard gas cylinder and the exhaust bag are coaxially arranged;
the linear guide rail is fixed on a flat workbench, 4 sliding blocks are arranged on the linear guide rail, 2 of the outer side are used for fixedly mounting the support, and 2 of the inner side are used for fixing the adjustable support and can slide and lock on the linear guide rail.
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| CN111141694A (en) * | 2019-12-16 | 2020-05-12 | 交通运输部公路科学研究所 | Calibration device and method for tunnel carbon monoxide content detector based on infrared absorption method |
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