Airflow segmenting and filtering mechanism of a laser gas analyzer

Abstract

The utility model relates to a kind of airflow subsection screen filtering mechanism of laser gas analyzer, include box, gas inlet and gas outlet being arranged on box, filter mixing assembly being arranged in box and being interconnected by communicating pipe, suction pump and laser gas analyzer, gas shunt assembly of two end communication filter mixing assembly gas inlet end and suction pump gas outlet end;The filter mixing assembly includes the mixing box being arranged in box, filter assembly being arranged in mixing box, gas stirring assembly being arranged on filter assembly and rotating by airflow;The gas shunt assembly can make the gas flowing from mixing box again flow back into mixing box;The utility model continues to guide the gas flowing from mixing box gas outlet end to the place of mixing box gas inlet end by gas shunt assembly, so that gas is filtered and stirred again, so that gas is more uniform, avoid detection error, and when gas flows, it can produce the power of rotation for gas stirring assembly, so that motor drive is not needed.

Description

Technical Field

[0001] This utility model relates to the field of gas analysis, and specifically to a gas flow segmentation filtration mechanism for a laser gas analyzer. Background Technology

[0002] Laser gas analyzers are laser gas analysis systems based on semiconductor laser absorption spectroscopy technology. They can perform online measurements of gas concentration and other parameters in various environments and feature high accuracy, fast response, high reliability, and low operating costs, greatly facilitating production optimization, energy recovery, safety control, environmental monitoring, and scientific research. However, laser gas analyzers are susceptible to interference during measurement. Impurities in the gas flow can easily lead to inaccurate results. Therefore, it is essential to ensure that the gas flow is uniform and stable as it passes through the analyzer to enhance accuracy.

[0003] Existing technology 202320913907.1 discloses an airflow segmentation filtration mechanism for a laser gas analyzer, which "mainly consists of a housing, a fan, an inlet pipe, a laser gas analyzer, an exhaust pipe, and a support plate. The core filtration mechanism includes: an input pipe fixedly connected to the output end of the fan, with a primary filter screen mounted on its right outer wall via a connecting seat, and a slidable and detachable collection bucket inside the connecting seat. Dual-stage filtration (primary filter screen + secondary filter screen) is used to achieve particle classification and interception, and the snap-fit ​​collection bucket design facilitates impurity cleaning. A fan blade structure is added inside the mixing chamber to forcibly agitate the airflow, effectively preventing detection errors caused by gas stratification."

[0004] The aforementioned patent describes a gas analysis process where the gas is first drawn in through the inlet of the chamber and discharged through the outlet. The gas is then processed within the chamber in the order of filtration, agitation, and analysis. While this allows the gas to be thoroughly mixed before analysis, the air is constantly flowing, whereas the mixing chamber is fixed. The air simply passes through the mixing chamber and then directly enters the laser gas analyzer, preventing the gas from being adequately agitated and thus still resulting in detection errors. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a segmented airflow filtration mechanism for a laser gas analyzer.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a segmented airflow filtration mechanism for a laser gas analyzer, comprising a housing, an air inlet located at one end of the housing, an air outlet located at the other end of the housing, a filter mixing assembly located inside the housing and connected to the air inlet via a connecting pipe, an intake pump located inside the housing and connected to the outlet of the filter mixing assembly via a connecting pipe, a laser gas analyzer located inside the housing and connected to the outlet of the intake pump via connecting pipes at its inlet and outlet ends respectively, and one end connected to the air inlet... A gas diversion assembly is provided on the connecting pipe between the inlet and the filter mixing assembly, and on the other end of which is connected to the connecting pipe between the filter mixing assembly and the suction pump, for freely switching the direction of gas flow; the filter mixing assembly includes a mixing chamber with the inlet end connected to the inlet and the outlet end connected to the suction pump, a filter assembly provided in the mixing chamber, and a gas stirring assembly rotatably mounted on the filter assembly with one end driven along the inlet end of the mixing chamber for rotating and stirring by airflow; the gas diversion assembly can allow the gas flowing out of the mixing chamber to flow back into the mixing chamber.

[0007] Preferably, the filter assembly includes two mounting plates spaced apart inside the mixing chamber, multiple filter ports on the two mounting plates, a primary filter on a filter port on one mounting plate near the air inlet of the mixing chamber, a secondary filter on a filter port on the other mounting plate, two collection boxes slidably disposed at the bottom of the chamber and directly below the two mounting plates, and two collection ports correspondingly disposed at the bottom of the mixing chamber for communicating with the two collection boxes.

[0008] Preferably, the gas stirring assembly includes two bearings disposed on the middle of two mounting plates, a drive shaft with one end extending into the air inlet of the mixing chamber and the other end passing through the two bearings, multiple rotating blades disposed on the end of the drive shaft located inside the air inlet of the mixing chamber for rotating by airflow, and multiple stirring blades disposed on the drive shaft for stirring the gas.

[0009] Preferably, the drive shaft is provided with multiple scrapers that fit against the two mounting plates and are used to scrape off impurities from the primary and advanced filter screens at the filter openings of the two mounting plates.

[0010] Preferably, the gas splitting assembly includes a three-way pipe and a three-way solenoid valve respectively disposed on the connecting pipe between the air inlet and the air inlet of the mixing box and the connecting pipe between the air outlet of the suction pump and the air inlet of the laser gas analyzer, a branch pipe with both ends connected to the three-way pipe and the three-way solenoid valve respectively, and a single-way solenoid valve disposed on the air inlet.

[0011] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0012] This invention uses a gas diversion component to guide the gas flowing out of the mixing chamber outlet to the mixing chamber inlet, allowing the gas to be filtered and stirred again, making the gas more uniform, avoiding detection errors, and generating rotational power for the gas stirring component during gas flow, thus eliminating the need for a motor drive. Attached Figure Description

[0013] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0014] Appendix Fig. 1 This is a schematic diagram of the overall structure of the airflow segmented filtration mechanism of the laser gas analyzer described in this utility model;

[0015] Appendix Fig. 2 This is a schematic diagram of the overall structure of the airflow segmented filtration mechanism of the laser gas analyzer described in this utility model.

[0016] The components include: 1. Housing; 2. Air inlet; 3. Air outlet; 4. Filter mixing assembly; 41. Mixing box; 42. Filter assembly; 421. Mounting plate; 422. Filter port; 423. Primary filter screen; 424. Advanced filter screen; 425. Collection box; 426. Collection port; 43. Gas stirring assembly; 431. Bearing; 432. Drive shaft; 433. Rotating blade; 434. Stirring blade; 5. Suction pump; 6. Laser gas analyzer; 7. Gas branching assembly; 71. T-connector; 72. T-connector solenoid valve; 73. Branch pipe; 74. Single-connector solenoid valve; 8. Scraper. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Appendix Figs. 1-2The airflow segmentation filtration mechanism of the laser gas analyzer 6 of this utility model includes a housing 1, an air inlet 2 located at one end of the housing 1, an air outlet 3 located at the other end of the housing 1, a filter mixing assembly 4 located inside the housing 1 with its inlet end connected to the air inlet 2 via a connecting pipe, an intake pump 5 located inside the housing 1 with its inlet end connected to the outlet end of the filter mixing assembly 4 via a connecting pipe, a laser gas analyzer 6 located inside the housing 1 with its inlet and outlet ends connected to the outlet end of the intake pump 5 and the outlet 3 respectively via connecting pipes, and a connecting pipe with one end connected to the air inlet 2 and the filter mixing assembly, and the other end connected to the filter mixing assembly. A gas diversion assembly 7 is provided on the connecting pipe between the component and the suction pump 5 for freely switching the gas flow direction; the filter mixing assembly includes a mixing chamber 41 disposed inside the housing 1 with its inlet end connected to the inlet port 2 and its outlet end connected to the suction pump 5, a filter assembly 42 disposed inside the mixing chamber 41, and a gas stirring assembly 43 rotatably disposed on the filter assembly 42 and driven to the inlet end of the mixing chamber 41 for rotational stirring by airflow; the gas diversion assembly 7 allows the gas flowing out of the mixing chamber 41 to flow back into the mixing chamber 41; the filter assembly 42 includes two mounting plates 421 spaced apart and inserted into the mixing chamber 41. The gas mixing assembly 43 includes multiple filter ports 422 on two mounting plates 421, a primary filter 423 on a filter port 422 on one mounting plate 421 near the air inlet of the mixing chamber 41, a high-grade filter 424 on a filter port 422 on the other mounting plate 421, two collection boxes 425 slidably disposed at the bottom of the chamber 1 and directly below the two mounting plates 421, and two collection ports 426 correspondingly disposed at the bottom of the mixing chamber 41 for communicating with the two collection boxes 425; the gas mixing assembly 43 includes two bearings 431 disposed in the middle of the two mounting plates 421, one end of which extends into the air inlet of the mixing chamber 41 and The other end passes through the drive shaft 432 of the two bearings 431, and multiple rotating blades 433 are set on the end of the drive shaft 432 located inside the air inlet of the mixing box 41 for rotating by airflow. Multiple stirring blades 434 are set on the drive shaft 432 for stirring the gas. The gas branching assembly 7 includes a three-way pipe 71 and a three-way solenoid valve 72 respectively set on the connecting pipe between the air inlet 2 and the air inlet of the mixing box 41 and the connecting pipe between the air outlet of the suction pump 5 and the air inlet of the laser gas analyzer 6, a branch pipe 73 with both ends connected to the three-way pipe 71 and the three-way solenoid valve 72 respectively, and a single-way solenoid valve 74 set on the air inlet 2.

[0019] Furthermore, the drive shaft 432 is provided with a root scraper 8 that fits against the two mounting plates 421 to scrape off impurities from the primary filter screen 423 and the advanced filter screen 424 at the filter ports 422 of the two mounting plates 421, thereby scraping off the attached impurities.

[0020] In use: First, open the single-way solenoid valve 74, then switch the three-way solenoid valve 72 to connect the suction pump 5 to the branch pipe 73. Then start the suction to draw in air. The gas outside the housing 1 enters the inlet 2 through the single-way solenoid valve 74, and then enters the mixing chamber 41 from the inlet 2. After some gas enters the mixing chamber 41, close the single-way solenoid valve 74. When the gas enters the mixing chamber 41, it passes through the rotating blades 433 in the inlet of the mixing chamber 41. The gas flow drives the rotating blades 433 to rotate, which in turn drives the drive shaft 432 to rotate. The drive shaft 432 then drives the stirring blades 434 and the scraper 8 to rotate. After the gas enters the mixing chamber 41, the stirring blades 434 stir the gas. The gas then passes through multiple filter ports 422 on the two mounting plates 421 and flows out from the outlet of the mixing chamber 41. Since the filter ports 422 on the two mounting plates 421 are equipped with primary filter screens 423 and high-grade filter screens 423 respectively... The filter screen 424 filters out large and small particulate impurities in the gas after it passes through, and the large and small particulate impurities fall into the collection box 425. The filtered and stirred gas then passes through the suction pump 5 and flows out from the outlet of the suction pump 5. Since the three-way solenoid valve 72 connects the suction pump 5 to the branch pipe 73, the gas flows into the branch pipe 73 and then into the three-way pipe 71. The gas then flows back into the mixing box 41 by the suction of the suction pump 5, which drives the rotating blade 433 to rotate again. The gas is filtered and stirred again, and then enters the suction pump 5 from the outlet of the mixing box 41. It is then guided to the branch pipe 73 by the three-way solenoid valve 72. After repeating this process several times, the gas is fully stirred. Then the three-way solenoid valve 72 is switched to connect the suction pump 5 to the laser gas analyzer 6, and the gas enters the laser gas analyzer 6 for analysis. Finally, the gas is discharged from the outlet 3 of the box 1.

[0021] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A flow segmenting skimmer mechanism for a laser gas analyzer, characterized by: The system includes a housing, an air inlet at one end of the housing, an air outlet at the other end of the housing, a filter mixing assembly located inside the housing with its inlet end connected to the air inlet via a connecting pipe, an intake pump located inside the housing with its inlet end connected to the outlet end of the filter mixing assembly via a connecting pipe, a laser gas analyzer located inside the housing with its inlet and outlet ends connected to the outlet end of the intake pump and the outlet end of the filter mixing assembly respectively via connecting pipes, and a gas diversion assembly for freely switching the gas flow direction, with one end connected to the connecting pipe between the air inlet and the filter mixing assembly and the connecting pipe between the filter mixing assembly and the intake pump; the filter mixing assembly includes a mixing chamber located inside the housing with its inlet end connected to the air inlet and its outlet end connected to the intake pump, a filter assembly located inside the mixing chamber, and a gas stirring assembly rotatably mounted on the filter assembly with one end driven along the air inlet end of the mixing chamber for rotating and stirring by airflow; the gas diversion assembly allows gas flowing out of the mixing chamber to flow back into the mixing chamber.

2. The flow segmenting skimmer mechanism for a laser gas analyzer of claim 1, wherein: The filter assembly includes two mounting plates spaced apart inside the mixing chamber, multiple filter ports on the two mounting plates, a primary filter on the filter port of one mounting plate near the air inlet of the mixing chamber, a high-grade filter on the filter port of the other mounting plate, two collection boxes slidably disposed at the bottom of the chamber and directly below the two mounting plates, and two collection ports correspondingly disposed at the bottom of the mixing chamber for communicating with the two collection boxes.

3. The flow segmenting skimmer mechanism for a laser gas analyzer of claim 1, wherein: The gas stirring assembly includes two bearings disposed in the middle of two mounting plates, a drive shaft with one end extending into the air inlet of the mixing chamber and the other end passing through the two bearings, multiple rotating blades disposed on the end of the drive shaft located inside the air inlet of the mixing chamber for rotating by airflow, and multiple stirring blades disposed on the drive shaft for stirring the gas.

4. The flow segment skimmer mechanism of a laser gas analyzer according to claim 3, characterized in that: The drive shaft is equipped with a root scraper that fits against the two mounting plates and is used to scrape off impurities from the primary and advanced filter screens at the filter inlets of the two mounting plates.

5. The flow segment skimmer mechanism for a laser gas analyzer of claim 1, wherein: The gas splitting assembly includes a three-way pipe and a three-way solenoid valve respectively installed on the connecting pipe between the air inlet and the air inlet of the mixing box and on the connecting pipe between the air outlet of the suction pump and the air inlet of the laser gas analyzer, a branch pipe with both ends connected to the three-way pipe and the three-way solenoid valve respectively, and a single-way solenoid valve installed on the air inlet.

Images