An infrared gas analyzer

Abstract

The present invention provides an infrared gas analyzer, which relates to the field of gas analyzers. The infrared gas analyzer includes a product housing and a light source, a filter, and a diaphragm receiver installed inside the product housing. It also includes a self-rotating light shield, which is arranged between the light source and the filter. It also includes a detection chamber and a reference chamber installed in the product housing, which are arranged between the filter and the diaphragm receiver. It also includes an air inlet and outlet assembly installed in the product housing, and the air inlet and outlet assembly is connected to the detection chamber. The infrared gas analyzer can achieve vortex dispersion of the incoming airflow by using the detection chamber, so that when light is irradiated, it is easier to test the absorption of light by different gases, avoiding the problem of uneven gas concentration leading to large errors in the test structure. When the air intake is stopped, the negative pressure pump will empty the interior of the detection chamber, thereby directly maintaining the detection chamber and avoiding inaccurate test structures due to pollution problems in the later stage.

Description

Technical Field

[0001] The present invention relates to the field of gas analyzers, in particular to an infrared gas analyzer. Background Art

[0002] Infrared gas analyzers use infrared rays to analyze gases. They do this based on the fact that the concentrations of the components to be analyzed are different, and the absorbed radiation energy is different. The remaining radiation energy causes the temperature in the detector to rise differently, and the pressure on both sides of the moving film is different, thereby generating an electrical signal of the capacitance detector. In this way, the concentration of the components to be analyzed can be indirectly measured.

[0003] However, the current infrared gas analyzers still have the following disadvantages:

[0004] 1. There is cross interference between gases. If the gases circulating in the detection room have cross interference, the absorption of light will fluctuate, so the measurement data will have a small error.

[0005] 2. The testing room cannot be kept pure when there is no testing, so the machine needs to be maintained frequently. If it is not cleaned carefully before testing, the measurement results will not be accurate.

[0006] 3. The power source of the light shield is generally installed improperly, so the light source cannot be evenly distributed in the reference room and the test room. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides an infrared gas analyzer that solves the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an infrared gas analyzer, including a product housing and a light source, a filter and a diaphragm receiver installed inside the product housing, and also including a self-rotating light shield, which is arranged between the light source and the filter, and also including a detection chamber and a reference chamber installed in the product housing, which are arranged between the filter and the diaphragm receiver, and also including an air inlet and outlet assembly installed in the product housing, which is connected to the detection chamber and is used to filter pressurized air, empty the gas inside the detection chamber with negative pressure when the air intake is stopped, and stop the negative pressure when the air intake is active, so that the gas entering the detection chamber can maintain low-speed rotation from entry to exit.

[0009] Preferably, the detection chamber includes a reflective tube and window panels installed at both ends of the reflective tube, and also includes two air inlet pipes. The air inlet pipes are installed obliquely on the reflective tube and tilted toward the direction of gas flow. Two vortex sheets are installed on the inner wall of the reflective tube corresponding to the position of the air inlet pipe. The vortex sheets are on the side where the air flows out of the air inlet pipe. The outer wall of the other end of the reflective tube is provided with a circle of distributed air outlets. The air outlets and the air inlet pipes are used to connect the air inlet and outlet components to realize air circulation.

[0010] Preferably, an air sleeve is fixedly sleeved on the outer wall of the reflective tube at a position corresponding to the air outlet, the air outlet is communicated with the inner cavity of the air sleeve, and the air sleeve is connected to the air inlet and outlet components.

[0011] Preferably, the air inlet and outlet assembly includes an air inlet circuit, a constant pressure component, an electronically controlled air outlet tee, and a negative pressure pump. One end of the air inlet circuit is mounted on the product housing and communicates with the outside world, and the other end is connected to the constant pressure component. The air outlet end of the constant pressure component further branches into two air circuits and is connected to the two air inlet pipes respectively.

[0012] One end of the electrically controlled air outlet tee is connected to the air sleeve, the other end is connected to the outside of the product housing and communicated with the outside world, and the last end is installed with a negative pressure tube, which is connected to the negative pressure pump. The electrically controlled air outlet tee is used to control the air sleeve to disconnect the negative pressure tube and directly connect it to the outside of the product housing, and is also used to control the air sleeve to disconnect from the outside world and directly connect it to the negative pressure tube, at which time the negative pressure pump starts to run;

[0013] When the air inlet path is in operation, the constant pressure component can control the negative pressure pump to stop pumping air from the negative pressure tube.

[0014] Preferably, the constant pressure member includes a sleeve, a core shaft, a piston, a limiter and a spring. The limiter is arranged in the sleeve, dividing the sleeve into two cavities of different sizes. The piston is connected to the core shaft and is located inside the large cavity of the sleeve. The piston seals the sleeve. The spring is located outside the core shaft and connects the piston to the inner bottom wall of the sleeve. The air intake path is connected to the small cavity of the sleeve, and the air intake pipe is connected to the large cavity of the sleeve. When air is taken in by the air intake path, the piston moves to compress the spring and cause the core shaft to extend out of the sleeve until the piston moves to the intake pipe to exhaust air.

[0015] The extension of the core shaft from the sleeve can close the negative pressure pump.

[0016] Preferably, the two vortex sheets and the two intake pipes are distributed relative to each other at an angle of 180 degrees, the expansion angle of the vortex sheets is 90 degrees, and the vortex sheets have a spiral structure.

[0017] Preferably, the self-rotating sunshade includes a shell and a sunshade. The shell is an annular structure and is installed on the light source. The sunshade is inside the shell. A motor is installed outside the shell. The motor uses gears to engage the outer ring of the sunshade to control the rotation of the sunshade.

[0018] Preferably, annular grooves are provided at the outer circles of both sides of the light shielding sheet, and the corresponding positions of the housing are identical to the structures thereof, and a plurality of rollers are provided in the grooves of both.

[0019] Preferably, a moisture absorber and an air pump are respectively installed on the air intake path.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The infrared gas analyzer can realize vortex dispersion of the incoming airflow by using the detection chamber. The airflow gradually enters and disperses and then disperses out. Therefore, when the light is irradiated, it is easier to test the absorption of light by different gases, avoiding the problem of large error in the test structure caused by uneven gas concentration.

[0022] 2. When the infrared gas analyzer is taking in air, it can first use the negative pressure pump to empty the gas inside the detection chamber. As the air is gradually taken in, the air pressure inside the detection chamber is balanced. Therefore, during the detection, the initial gas is purer and the detection structure is more accurate. Once the air intake is stopped, the negative pressure pump will empty the interior of the detection chamber, thereby directly maintaining the detection chamber and avoiding inaccurate test structure due to contamination problems in the later stage.

[0023] 3. The power source of the shading plate of the infrared gas analyzer is not concentrated at the center of the circle, thus avoiding the power source blocking the infrared light source. The outer ring meshing drive is used to increase the speed without affecting the irradiation of the light source, thereby avoiding complex position design and improving test accuracy.

[0024] 4. For this infrared gas analyzer, if the pressure of the incoming gas fluctuates, the piston will move due to the reaction force of the spring, and the negative pressure pump will start in time to quickly empty the internal gas to be tested. Therefore, the gas that enters again after the fluctuation is not affected by the previous gas, and the test result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a diagram of the internal structure of the product housing of the present invention;

[0027] Figure 3 This is a top view of the structure of the product housing of the present invention;

[0028] Figure 4 It is a partial structural diagram of the present invention;

[0029] Figure 5 is a structural diagram of the self-rotating shutter of the present invention;

[0030] Figure 6 This is a structural diagram of the air inlet and outlet components and the reflective tube of the present invention;

[0031] Figure 7 For the present invention Figure 6 A magnified view of the structure at point A;

[0032] Figure 8 It is a structural diagram of the detection chamber of the present invention;

[0033] Figure 9 This is a diagram of the internal structure of the reflection tube of the present invention.

[0034] In the figure: 1. Self-rotating light shield; 101. Housing; 102. Light shield; 103. Motor; 2. Detection chamber; 201. Reflection tube; 202. Window; 203. Air inlet pipe; 204. Vortex sheet; 205. Air outlet; 206. Air sleeve; 3. Reference chamber; 4. Air inlet and outlet components; 401. Air inlet path; 402. Constant pressure part; 4022. Sleeve; 4023. Core shaft; 4024. Piston; 4025. Limiter; 4026. Spring; 403. Electric air outlet tee; 404. Negative pressure pump; 405. Negative pressure pipe; 406. Moisture absorber; 407. Air pump. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] like Figure 1-9 As shown, an infrared gas analyzer includes a product housing and a light source, a filter and a diaphragm receiver installed inside the product housing, and also includes a self-rotating light shield 1, which is arranged between the light source and the filter. It also includes a detection chamber 2 and a reference chamber 3 installed in the product housing, which are arranged between the filter and the diaphragm receiver. It also includes an air inlet and outlet assembly 4 installed in the product housing, and the air inlet and outlet assembly 4 is connected to the detection chamber 2, and is used to filter pressurized incoming air, empty the gas inside the detection chamber 2 with negative pressure when the air intake is stopped, and stop the negative pressure when the air intake is active. The gas entering the detection chamber 2 can maintain low-speed rotation from entry to exit.

[0040] The infrared gas analyzer is a new type of intelligent analyzer developed by combining NDIR and GFC principles with advanced microcomputer technology. Utilizing the principle of non-dispersive infrared absorption spectroscopy, when infrared light of a specific wavelength passes through the gas being measured, the gas absorbs the light energy, thereby detecting the concentration of the corresponding gas. The module also incorporates correlation filtering to effectively reduce background gas crosstalk, allowing for continuous analysis of the concentration of one or more gas components in a mixed gas. The product housing can be customized to suit the specific application scenario, allowing for flush-mounted or horizontal placement.

[0041] The product housing is equipped with a TFT true-color display that can simultaneously display measured values, historical curves, ranges, status, and various parameter setting interfaces. The instrument parameters can be configured, calibrated, and tested in the form of a full-Chinese touch-sensitive menu. Historical records and curves can be set according to time and other quick operations, and Chinese and English menus can be switched with one button. It has a built-in voltage and current stabilization device, control contact output, over-limit self-alarm (buzzer), and the control mode can be set at will. It also has a standard 4-20mA current output, external ports such as RS-232 or RS-485 (either one can be selected), and an Ethernet port.

[0042] The light source can be a single beam: simple structure, low cost, but susceptible to light source fluctuations, or a dual beam: the reference beam compensates for light source fluctuations and has high stability.

[0043] The filter uses multi-layer dielectric films such as ZnS / MgF2 alternating coating, up to 50 layers. It is a key optical component in the infrared gas analyzer. Its performance directly affects the detection selectivity and sensitivity, and is used to filter out interference bands.

[0044] The structure of the reference chamber 3 is basically the same as that of the detection chamber 2. The interior of the reference chamber 3 is filled with nitrogen that does not absorb infrared light.

[0045] In an optional embodiment, the detection chamber 2 includes a reflection tube 201 and window panels 202 installed at both ends of the reflection tube 201, and also includes two air inlet pipes 203. The air inlet pipes 203 are obliquely installed on the reflection tube 201 and tilted toward the direction of gas flow. Two vortex sheets 204 are installed on the inner wall of the reflection tube 201 corresponding to the position of the air inlet pipe 203. The vortex sheets 204 are on the side where the air inlet pipe 203 outlets the air. The outer wall of the other end of the reflection tube 201 is provided with a circle of distributed air outlets 205. The air outlets 205 and the air inlet pipes 203 are used to connect the air inlet and outlet components 4 to realize air circulation.

[0046] In this embodiment, the detection chamber utilizes a White cell optical structure, providing an effective optical path length of 6 meters. This significantly increases the optical path length within the limited gas chamber dimensions, thereby improving the instrument's resolution. The inner wall of the reflector tube 201 is gold-plated or polished aluminum, achieving a reflectivity greater than 95%. The eddy current sheet 204 is welded to the interior of the reflector tube 201 and does not obstruct the window 202. The window material is CaF2 (2-10μm, ZnSe 0.5-20μm, or sapphire UV-IR).

[0047] In an optional embodiment, an air sleeve 206 is fixedly sleeved on the outer wall of the reflection tube 201 at the position corresponding to the air outlet 205 , and the air outlet 205 is communicated with the internal cavity of the air sleeve 206 , and the air sleeve 206 is connected to the air inlet and outlet assembly 4 .

[0048] In this embodiment, the gas jacket 206 seals the outer wall of the reflection tube 201 , and a solenoid valve is provided inside the gas jacket 206 , which can be opened and closed by an electrical signal.

[0049] In an optional embodiment, the air inlet and outlet assembly 4 includes an air inlet circuit 401, a constant pressure component 402, an electronically controlled air outlet tee 403, and a negative pressure pump 404. One end of the air inlet circuit 401 is mounted on the product housing and communicates with the outside world, and the other end is connected to the constant pressure component 402. The air outlet end of the constant pressure component 402 further branches into two air circuits and is respectively connected to the two air inlet pipes 203.

[0050] One end of the electrically controlled air outlet tee 403 is connected to the air sleeve 206, and the other end is connected to the outside of the product housing and communicated with the outside world. The last end is installed with a negative pressure tube 405, which is connected to the negative pressure pump 404. The electrically controlled air outlet tee 403 is used to control the air sleeve 206 to disconnect the negative pressure tube 405 and directly communicate with the outside of the product housing. It is also used to control the air sleeve 206 to disconnect from the outside world and directly communicate with the negative pressure tube 405. At this time, the negative pressure pump 404 starts to operate;

[0051] When the air inlet path 401 is in operation, the constant pressure component 402 can control the negative pressure pump 404 to stop pumping air from the negative pressure tube 405 .

[0052] In this embodiment, the air inlet 401 is responsible for connecting to the external detection gas pipeline. The air inlet 401 is provided with an interface outside the product housing for realizing a quick connection of the detection gas pipeline.

[0053] The electronically controlled air outlet tee 403 is composed of a plurality of solenoid valves, and one of the channels can be closed separately when in use.

[0054] In an optional embodiment, the constant pressure member 402 includes a sleeve 4022, a core shaft 4023, a piston 4024, a limiter 4025 and a spring 4026. The limiter 4025 is provided in the sleeve 4022, dividing the sleeve 4022 into two cavities of different sizes. The piston 4024 is connected to the core shaft 4023 and is located inside the large cavity of the sleeve 4022. The piston 4024 seals the sleeve 4022. The spring 4026 is located outside the core shaft 4023 and connects the piston 4024 to the inner bottom wall of the sleeve 4022. The air intake path 401 is connected to the small cavity of the sleeve 4022, and the air intake pipe 203 is connected to the large cavity of the sleeve 4022. When air is taken in by the air intake path 401, the piston 4024 moves to compress the spring 4026 and cause the core shaft 4023 to extend out of the sleeve 4022 until the piston 4024 moves to the air intake pipe 203 for exhaust.

[0055] The core shaft 4023 extends from the sleeve 4022 to close the negative pressure pump 404.

[0056] In this embodiment, the switch of the negative pressure pump 404 is installed with a position sensor, and a sensor kit is attached to the core shaft 4023. The core shaft 4023 extends from the sleeve 4022, and the position sensor is used to control the negative pressure pump 404 to be turned off.

[0057] The limiter 4025 inside the sleeve 4022 can prevent the piston 4024 from moving excessively, which may cause the air pressure to be difficult to push the piston 4024 later.

[0058] In an optional embodiment, the two vortex sheets 204 and the two intake pipes 203 are both distributed relative to each other at an angle of 180 degrees, the deployment angle of the vortex sheet 204 is 90 degrees, and the vortex sheet 204 has a spiral structure.

[0059] In this embodiment, the vortex sheet 204 has a certain pitch, which can make the incoming airflow rotate, and the blowing direction of the air inlet pipe 203 just corresponds to the vortex sheet 204.

[0060] In an optional embodiment, the self-rotating sunshade 1 includes a shell 101 and a sunshade 102. The shell 101 is a ring-shaped structure and is installed on the light source. The sunshade 102 is inside the shell 101. A motor 103 is installed on the outside of the shell 101. The motor 103 uses gears to engage the outer ring of the sunshade 102 to control the rotation of the sunshade 102.

[0061] In this embodiment, the light shield 102 is a key modulation component in the infrared gas analyzer. It converts a continuous optical signal into an alternating signal by periodically blocking the optical path. The outer ring of the light shield 102 is provided with teeth and grooves that mate with gears. Rotating the motor 103 on the outer ring engages and drives the light shield 102.

[0062] In an optional embodiment, annular grooves are provided on the outer circles of both sides of the light shielding sheet 102, and the corresponding position of the housing 101 has the same structure as that of the housing 101, and a plurality of rollers are provided in the grooves of both.

[0063] In this embodiment, the use of rollers makes it easier to break through the rotation speed limit of the light shielding sheet 102 and can be used for a long time without wear.

[0064] In an optional embodiment, a moisture absorber 406 and an air pump 407 are respectively installed on the air inlet path 401 .

[0065] In this embodiment, in the infrared gas analyzer, moisture absorber 406 is used to eliminate interference from water vapor in the sample gas. This is particularly true when measuring gases such as CO2, CO, and SO2. The infrared absorption peaks of moisture (e.g., 2.7μm and 6.2μm) can overlap with the absorption peaks of the target gas, leading to measurement errors. Molecular sieves or silica gel can be used.

[0066] When in use, turn on the power, the electronically controlled air outlet tee 403 operates, and the air sleeve 206 is closed from the outside. At this time, the negative pressure pump 404 starts to operate, and the negative pressure pump 404 uses the negative pressure tube 405 to evacuate the interior of the reflective tube 201. The light source emits infrared light through the self-rotating shutter 1, and then is filtered by the filter and irradiated to the detection chamber 2 and the reference chamber 3 respectively. The self-rotating shutter 1 can freely control the speed as the motor 103 runs, and the motor 103 is set above the light source and does not affect the irradiation of the light source. Then the air inlet 401 is opened. , the air pump 407 starts to pump the gas to be tested. The water content of the gas is removed first, and then it enters the constant pressure part 402. The gas entering the constant pressure part 402 uses pressure to push the piston 4024 until the spring 4026 is compressed and the core shaft 4023 moves out of the sleeve 4022. When the core shaft 4023 moves out of the sleeve 4022, the position detection of the sensor or the change of the electrical signal can be used to control the negative pressure pump 404 to stop running. If the air pressure index of the negative pressure extraction meets the requirements at this time, the negative pressure pump 404 stops automatically.

[0067] As the gas passes through the sleeve 4022 and enters the reflector tube 201, the gas will enter from the direction of the two air inlet pipes 203. After entering, the gas will be blown toward the vortex sheet 204, and then a rotation will occur. Because the air outlet 205 is distributed in an annular shape along the reflector tube 201, the gas can be discharged in one circle. Therefore, the gas passing through the reflector tube is in a state of low-speed rotation, so the infrared rays can be well absorbed by the gas being detected when passing through. Once the pressure of the incoming gas fluctuates, the piston 4024 is moved by the reaction force of the spring 4026, and the negative pressure pump 404 is started in time to quickly empty the internal gas to be detected. Therefore, the gas entering again after the fluctuation is not affected by the previous gas, and the detection result is more accurate.

[0068] After the subsequent test is completed, once the test air intake is stopped, the negative pressure pump 404 will empty the interior of the test chamber 2, thereby directly maintaining the test chamber 2 and avoiding inaccurate test structures due to contamination problems in the later stage.

[0069] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0070] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An infrared gas analyzer comprising a housing and a light source, a filter, and a diaphragm receiver mounted inside the housing, characterized in that: The device also includes a self-rotating light shield, which is arranged between the light source and the filter, a detection chamber and a reference chamber installed in the product housing, which are arranged between the filter and the diaphragm receiver, and an air inlet and outlet assembly installed in the product housing, which is connected to the detection chamber and is used to filter the pressurized air, evacuate the gas inside the detection chamber with negative pressure when the air supply is stopped, and stop the negative pressure when the air supply is active, so that the gas entering the detection chamber can maintain low-speed rotation from entry to exit; The detection chamber includes a reflective tube and an air inlet pipe, the air inlet pipe is installed on the reflective tube, and the outer wall of the other end of the reflective tube is provided with a circle of air outlets, the position of the air outlets is fixed with an air sleeve, and the air outlets are connected to the internal cavity of the air sleeve; The air inlet and outlet assembly includes an air inlet path, a constant pressure piece, an electronically controlled air outlet tee, and a negative pressure pump. One end of the air inlet path is installed on the product housing and communicates with the outside world, and the other end is connected to the constant pressure piece. The air outlet end of the constant pressure piece is further divided into two air paths and connected to the two air inlet pipes respectively. One end of the electrically controlled air outlet tee is connected to the air sleeve, the other end is connected to the outside of the product housing and communicated with the outside world, and the last end is installed with a negative pressure tube, which is connected to the negative pressure pump. The electrically controlled air outlet tee is used to control the air sleeve to disconnect the negative pressure tube and directly connect it to the outside of the product housing, and is also used to control the air sleeve to disconnect from the outside world and directly connect it to the negative pressure tube, at which time the negative pressure pump starts to run; When the air inlet path is in operation, the constant pressure component can control the negative pressure pump to stop pumping air from the negative pressure pipe; The constant pressure member includes a sleeve, a core shaft, a piston, a limiter and a spring. The limiter is arranged in the sleeve, dividing the sleeve into two cavities of different sizes. The piston is connected to the core shaft and is located inside the large cavity of the sleeve. The piston seals the sleeve. The spring is located outside the core shaft and connects the piston to the inner bottom wall of the sleeve. The air intake path is connected to the small cavity of the sleeve, and the air intake pipe is connected to the large cavity of the sleeve. When air is taken in by the air intake path, the piston moves to compress the spring and cause the core shaft to extend out of the sleeve until the piston moves to the intake pipe to exhaust air. The extension of the core shaft from the sleeve can close the negative pressure pump.

2. The infrared gas analyzer according to claim 1, characterized in that: The detection chamber includes a window, the air inlet pipe is installed obliquely on the reflecting tube and tilted toward the direction of gas flow, and two vortex sheets are installed on the inner wall of the reflecting tube corresponding to the position of the air inlet pipe, and the vortex sheets are on the side of the air inlet pipe where air flows out.

3. The infrared gas analyzer according to claim 2, characterized in that: The two vortex sheets are distributed relative to the two intake pipes at an angle of 180 degrees, the expansion angle of the vortex sheets is 90 degrees, and they have a spiral structure.

4. The infrared gas analyzer according to claim 3, characterized in that: The self-rotating sunshade includes a shell and a sunshade. The shell is an annular structure and is installed on the light source. The sunshade is inside the shell. A motor is installed outside the shell. The motor uses gears to engage the outer ring of the sunshade to control the rotation of the sunshade.

5. The infrared gas analyzer according to claim 4, characterized in that: Annular grooves are provided at the outer circles of both sides of the light shielding sheet, and the corresponding positions of the sleeve and the sleeve have the same structure, and a number of rollers are provided in the grooves of both.

6. The infrared gas analyzer according to claim 5, characterized in that: A moisture absorber and an air pump are respectively installed on the air intake path.

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