CN211741062U

CN211741062U - Infrared CO gas analyzer based on gas correlation filtering technology

Info

Publication number: CN211741062U
Application number: CN201922426762.9U
Authority: CN
Inventors: 江康; 阎杰
Original assignee: Anhui Wanyi Science and Technology Co Ltd
Current assignee: Anhui Wanyi Science and Technology Co Ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2020-10-23
Anticipated expiration: 2029-12-28

Abstract

The utility model discloses an infrared CO gas analyzer based on gas correlation filtering technology, which comprises an infrared light source, a correlation wheel, a long optical path measuring air chamber and an analysis system, wherein infrared light emitted by the infrared light source is absorbed by gas in the correlation wheel and then is injected into the long optical path measuring air chamber, and enters the analysis system after being reflected for many times by the long optical path measuring air chamber; the related wheel comprises a cylindrical cavity, a first rotating shaft coaxial with the cavity is arranged in the cavity, the cavity is internally divided into a plurality of accommodating cavities with the same size and specification through partition plates, and the accommodating cavities are sequentially filled with CO sample gas, nitrogen gas and CO measuring range gas; one end and the first pivot fixed connection of baffle, the inner wall fixed connection of the other end and cavity for the cavity rotates through the drive of first pivot, and first pivot passes through motor drive and rotates. The utility model discloses integrated zero gas air chamber and range gas air chamber, simplified the operating procedure that zero point and range were markd, improved and markd efficiency and degree of accuracy.

Description

Infrared CO gas analyzer based on gas correlation filtering technology

Technical Field

The utility model relates to a gas analyzer, in particular to infrared CO gas analyzer based on gaseous relevant filtering technique.

Background

The traditional CO detection method comprises an infrared absorption method, an electrochemical method, a chemical sensor method and the like, and although various CO gas-sensitive devices are developed, the reliability and the stability are poor, and the service life is short. Compared with the latter two detection methods, the infrared absorption method has the advantages of high precision and sensitivity, wide measurement range, high response speed, good selectivity, stability and reliability, and rapid and continuous monitoring, thereby being widely applied.

In the prior art, due to the requirements of drift and calibration, zero point and range calibration needs to be performed on an analyzer periodically, and usually, a set of calibration air cavity needs to be additionally arranged outside the analyzer to perform zero point and range calibration on the analyzer during zero point and range calibration. The method needs to switch the air cavities respectively filled with the zero air and the measuring range air back and forth in the light path of the analyzer, the operation is complicated, and due to the need of switching back and forth, the position deviation of each time is easily caused, and the calibration is inaccurate.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies in the prior art, the utility model aims to provide an infrared CO gas analyzer based on gas correlation filtering technique, this infrared CO gas analyzer has integrated zero gas air chamber and range gas air chamber, simplifies the operating procedure that zero point and range were markd, has improved calibration efficiency and degree of accuracy.

The utility model provides a technical scheme that its technical problem adopted does: an infrared CO gas analyzer based on a gas correlation filtering technology comprises an infrared light source, a correlation wheel, a long optical path measuring gas chamber and an analysis system, wherein infrared light emitted by the infrared light source is absorbed by gas in the correlation wheel, then enters the long optical path measuring gas chamber, is reflected for multiple times by the long optical path measuring gas chamber and then enters the analysis system;

the relevant wheel comprises a cylindrical cavity, a first rotating shaft coaxial with the cavity is arranged in the cavity, the cavity is internally divided into a plurality of accommodating cavities with the same size and specification through partition plates, and the accommodating cavities are sequentially filled with CO sample gas, nitrogen gas and CO measuring range gas;

one end of the partition board is fixedly connected with the first rotating shaft, and the other end of the partition board is fixedly connected with the inner wall of the cavity, so that the cavity is driven to rotate by the first rotating shaft, and the first rotating shaft is driven to rotate by the motor.

Optionally, two ends of the partition plate are respectively integrally formed with the inner wall of the cavity and the first rotating shaft.

Optionally, the cross section of the accommodating cavity is a sector.

Optionally, the long-optical-path measurement gas chamber includes an optical cell, one end of the optical cell is provided with a first concave mirror, and the other end of the optical cell is provided with two second concave mirrors, wherein the curvature radii of the first concave mirror and the second concave mirror are consistent;

and the two second concave mirrors are arranged at one end of the optical tank, which is far away from the incident light reflector and the emergent light reflector.

Optionally, the optical cell is further provided with a chopper wheel at a position where the incident light reflector is installed, and the chopper wheel is disposed between the incident light reflector and the relevant wheel.

Optionally, the chopping wheel includes a hollow wheel body and a second rotating shaft coaxial with the wheel body, and the wheel body and the second rotating shaft are connected into a whole through a plurality of chopping plates.

Adopt above-mentioned technical scheme, the utility model discloses a mode of relevant wheel is with CO air chamber, zero gas air chamber and range gas air chamber integration and relevant round of going on, when carrying out zero point and range calibration, only need rotate through the relevant wheel of motor drive for the infrared light beam that infrared light source sent can loop through CO air chamber, zero gas air chamber and range gas air chamber, thereby accomplishes zero point and range and marks, compares in prior art, has simplified operating procedure, has improved and has markd efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of the structure of the relevant wheel of the present invention;

fig. 3 is a schematic structural view of the chopper wheel of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the utility model discloses an infrared CO gas analysis appearance based on gaseous relevant filtering technique, CO gas analysis appearance include infrared light source 1, relevant wheel 2, long light path measurement air chamber 3 and analytic system 4, and wherein, the infrared light of infrared light source 1 transmission is kicked into long light path measurement air chamber 3 after being absorbed by the gas in the relevant wheel 2 to get into analytic system 4 after long light path measurement air chamber 3 multiple reflection. In the present invention, the analysis system 4 can be an infrared detector used in the prior art, which can save the cost.

In this embodiment, the related wheel 2 includes a cylindrical cavity 201, a first rotating shaft 202 coaxial with the cavity 201 is provided in the cavity 201, the cavity 201 is divided into a plurality of accommodating cavities 204 with the same size and specification by a partition plate 203, and the plurality of accommodating cavities 204 are filled with a CO sample gas, a nitrogen gas and a CO range gas in sequence. In the present embodiment, since there are only three kinds of gases, the number of the accommodation chamber 204 may be set to 3. Specifically, during the setting, one end of the partition plate 203 is fixedly connected to the first rotating shaft 202, and the other end of the partition plate is fixedly connected to the inner wall of the cavity 201, so that the cavity 201 can be driven by the first rotating shaft 202 to rotate, and the first rotating shaft is driven by the motor to rotate. Of course, in another embodiment, the two ends of the partition 203 may be integrally formed with the inner wall of the cavity 201 and the first rotating shaft 202, respectively, to enhance the overall strength of the associated wheel 2.

In the present embodiment, the partition 203 may be disposed along a radial direction of the cavity 201, so that the cross section of the accommodating cavities 204 is fan-shaped, so as to equalize the volume of each accommodating cavity 204.

In the present embodiment, the long-optical-path measuring gas cell 3 includes an optical cell 301, one first concave mirror 302 is installed at one end in the optical cell 301, and two second concave mirrors 303 are installed at the other end of the optical cell 301, wherein the first concave mirror 302 and the second concave mirror 303 have the same radius of curvature, and the length of the first concave mirror 302 is 2 times the length of the second concave mirror 303. An incident light reflector 304 and an exit light reflector 305 are provided on both sides of the optical cell 301, and two second concave mirrors 303 are attached to one end of the optical cell 301 remote from the incident light reflector 304 and the exit light reflector 305.

In the present embodiment, the optical cell 301 is further mounted with a chopper wheel 5 at a position where the incident light reflector 304 is mounted, and the chopper wheel 5 is provided between the incident light reflector 304 and the correlation wheel 2.

Specifically, the chopping wheel 5 includes a hollow wheel body 501 and a second rotating shaft 502 coaxial with the wheel body 501, the wheel body 501 and the second rotating shaft 502 are connected into a whole through a plurality of chopping plates 503, in this embodiment, the number of the chopping plates 503 is 12, and the chopping plates 503 are arranged along the radial direction of the wheel body 501, so that a gap between every two adjacent chopping plates 503 forms a hole-shaped mask. The second shaft 502 can be driven to rotate by another motor.

In the present embodiment, the aperture mask of the chopper wheel 5 switches the infrared beam to a high-frequency modulated signal, which limits the detection bandwidth and is advantageous for suppressing interference signals from outside the bandwidth, thereby improving the signal-to-noise ratio.

In the present embodiment, as shown in fig. 1, the arrow in fig. 1 indicates the direction of the light path, when the infrared light source 1 emits infrared light, the infrared light enters the related wheel 2, and at the same time, the motor drives the related wheel 2 to rotate, so that the infrared light sequentially passes through the 3 accommodating cavities 204 of the related wheel 2. The three accommodating chambers 204 are represented herein by an a chamber, a B chamber, and a C chamber, respectively, for easy distinction, wherein the a chamber is filled with CO sample gas, the B chamber is filled with nitrogen gas, and the C chamber is filled with CO range gas. When infrared light passes through the air chamber A, the CO characteristic spectrum in the infrared light is completely absorbed, and after the CO in the air enters the long-optical-path measuring air chamber 3, the CO characteristic spectrum is not absorbed any more, and the energy of the infrared light cannot be further attenuated any more, so that the function of a reference signal is achieved. When infrared light enters the B gas chamber, the nitrogen does not absorb the CO characteristic spectrum, so the signal magnitude measured by the infrared detector is completely dependent on the CO concentration in the long-optical-path measurement gas chamber 3. When infrared light enters the C gas chamber, the absorption amount of the CO characteristic spectrum is equal to the light intensity of the range gas. In the process, the infrared detector can calibrate the zero point and the measuring range of the CO gas analyzer in the embodiment through signals respectively measured by the three gas chambers.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Besides the technical features described in the specification, other technical features are known to those skilled in the art, and further description of the other technical features is omitted here in order to highlight the innovative features of the present invention.

Claims

1. An infrared CO gas analyzer based on a gas correlation filtering technology is characterized by comprising an infrared light source, a correlation wheel, a long optical path measuring gas chamber and an analysis system, wherein infrared light emitted by the infrared light source is absorbed by gas in the correlation wheel, then enters the long optical path measuring gas chamber, is reflected by the long optical path measuring gas chamber for multiple times and then enters the analysis system;

2. The infrared CO gas analyzer based on gas correlation filtering technology of claim 1, wherein both ends of the baffle are integrally formed with the inner wall of the cavity and the first rotating shaft, respectively.

3. The infrared CO gas analyzer based on gas correlation filtering technology of claim 2, wherein the cross section of the receiving cavity is a sector.

4. The infrared CO gas analyzer based on gas correlation filtering technology as claimed in claim 3, wherein the long optical path measuring gas chamber comprises an optical cell, one end of the optical cell is provided with a first concave mirror, and the other end of the optical cell is provided with two second concave mirrors, wherein the first concave mirror and the second concave mirror have the same curvature radius;

5. The infrared CO gas analyzer based on gas correlation filtering technology as claimed in claim 4, wherein the optical cell is further installed with a chopper wheel at the position where the incident light reflector is installed, and the chopper wheel is arranged between the incident light reflector and the correlation wheel.

6. The infrared CO gas analyzer based on gas correlation filtering technology of claim 5, wherein the chopper wheel comprises a hollow wheel body and a second rotating shaft coaxial with the wheel body, and the wheel body and the second rotating shaft are connected into a whole through a plurality of chopper plates.