Gas distribution type oxygen sensor test board

Abstract

The utility model relates to the field of gas proportioning and testing, in particular to a gas distribution type oxygen sensor test board which is composed of a workbench, a gas distribution instrument, a ventilation cabinet, a resistance measuring instrument, a printer and a displayer. And the resistance measuring instrument, the printer and the display are electrically connected with the control unit. The gas distribution instrument feeds gas through various gas pipelines of nitrogen, carbon monoxide, carbon dioxide, hydrogen, propane and air, distributes the gas according to set metering, and feeds the gas into the ventilation cabinet through a communication pipeline with a propeller type guide impeller. Threaded holes are distributed in the side edge of the ventilation cabinet in a matrix mode so as to be matched with the sensing end of the to-be-detected oxygen sensor, and the sensing end makes contact with mixed gas. The resistance measuring instrument detects the resistance of the to-be-detected oxygen sensor in real time, data are transmitted to the printer for printing and the display for displaying through the control unit, and an anti-corrosion coating on the inner wall of the fume hood guarantees the durability of equipment. The test bench accurately simulates a gas environment and efficiently tests the performance of the to-be-tested oxygen sensor.

Description

Technical Field

[0001] This application relates to the field of gas mixing and testing, and in particular to a gas mixing type oxygen sensor test stand. Background Technology

[0002] As a core component in automotive exhaust emission control and industrial combustion process monitoring, the oxygen sensor plays a crucial role in maintaining efficient system operation and reducing pollutant emissions. Its performance directly impacts combustion efficiency, energy utilization, and environmental benefits; therefore, accurate performance testing of the oxygen sensor is essential.

[0003] Currently, existing high-temperature combustion calibration test benches have significant drawbacks. The calibration process relies on manual operation, and there is only one calibration port, leading to excessively long calibration times and low production capacity. Furthermore, the large temperature variations in the calibration ports of the combustion calibration bench cause differences in product ignition times, and the overall combustion atmosphere within the calibration port fluctuates greatly, resulting in poor stability and significant resistance deviations in the measured values. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides a gas-mixing oxygen sensor test bench, which accurately simulates a variety of mixed gases with set combustion atmosphere values ​​through a gas mixing instrument, avoiding the problem of large environmental changes caused by large temperature variations in the test environment. It is a stable and efficient test device that simulates combustion atmosphere values ​​through a gas mixing instrument, thereby improving the quality and reliability of the oxygen sensor under test. This gas-mixing oxygen sensor test bench has emerged as a result.

[0005] This application is achieved through the following technical solution:

[0006] A gas-mixing oxygen sensor test bench includes a workbench with a gas mixer, a fume hood, and a resistance meter. The gas mixer has several inlet ports connected to gas delivery pipes for conveying different gases. The outlet of the gas mixer is connected to the inlet of the fume hood via a connecting pipe. The gas mixer mixes the gases from the different delivery pipes according to a set metering to form a mixed gas with a set atmosphere in the fume hood. Several first threaded holes are provided on the side of the fume hood for mounting the oxygen sensor to be tested. The sensing end of the oxygen sensor extends into the fume hood and contacts the mixed gas. The resistance meter is electrically connected to the oxygen sensor to be tested and is used to detect the real-time resistance of the oxygen sensor.

[0007] By adopting the above technical solution, the gas mixing instrument connects to gas pipelines supplying different gases through multiple inlet ports, enabling precise mixing of various gases according to set measurements to form a specific atmosphere of mixed gas within the fume hood. This simulates various gas environments encountered by the oxygen sensor under test in different working scenarios, providing accurate and repeatable experimental conditions for performance testing of the oxygen sensor and facilitating the study of its operating characteristics under different gas compositions and concentrations. The fume hood provides space for testing, with the oxygen sensor mounted on the first threaded hole on the side of the fume hood, its sensing end extending into the fume hood to contact the mixed gas. A resistance meter is electrically connected to the oxygen sensor under test, detecting its resistance in real time. Changes in the resistance of the oxygen sensor reflect its response to different mixed gases. Researchers can use real-time resistance data to understand the working status of the oxygen sensor under test in different gas environments, accurately assess its performance (such as sensitivity and stability), and provide crucial data for the research, development, improvement, and quality control of the oxygen sensor.

[0008] Optionally, the gas pipeline includes a nitrogen pipeline, a carbon monoxide pipeline, a carbon dioxide pipeline, a hydrogen pipeline, a propane pipeline, and an air pipeline.

[0009] By employing the above technical solution, different gas pipelines can provide various gases, including nitrogen, carbon monoxide, carbon dioxide, hydrogen, propane, and air. A gas mixing device can mix these gases in different proportions to simulate the complex gas atmospheres that the oxygen sensor under test might encounter under various actual operating conditions. This facilitates comprehensive testing of the oxygen sensor's performance under different gas compositions and concentrations. Nitrogen, as an inert gas, can be used to adjust the oxygen content of the mixed gas to study the characteristics of the oxygen sensor under test in low-oxygen environments. Carbon monoxide, hydrogen, and propane are combustible gases and can be used to simulate rich-fuel conditions to test the oxygen sensor's response to reducing gases. Carbon dioxide, as a combustion product, can be used to examine the performance of the oxygen sensor under test in an atmosphere containing a certain amount of carbon dioxide. Air provides a normal oxygen-containing environment and can be mixed with other gases to adjust the oxygen content. This allows the test bench to cover various testing scenarios, meeting the testing requirements for different performance indicators of the oxygen sensor under test, such as sensitivity, selectivity, and response time, providing rich data support for the research, optimization, and quality control of the oxygen sensor under test. By precisely controlling the gas flow rate and ratio of each gas pipeline, a stable and accurate mixed gas composition can be provided, improving the repeatability and comparability of test results. This ensures the accuracy and reliability of the performance evaluation of the oxygen sensor under test, helps researchers accurately judge the performance of the oxygen sensor under test, and provides a guarantee for its reliability in practical applications.

[0010] Optionally, a printer is provided on the workbench, and the printer and resistance meter are electrically connected to the control unit of the equipment.

[0011] By adopting the above technical solution, the real-time resistance data of the oxygen sensor under test detected by the resistivity meter can be transmitted to the printer in a timely manner through an electrical connection with the control unit. The printer prints out this data in paper form, forming an intuitive test record. This avoids the problems of data loss or accidental deletion that may occur when data is stored only in electronic form, and allows testers to view, analyze, and archive it at any time, providing reliable data for the performance research and quality evaluation of the oxygen sensor under test. The printer can output data synchronously during the test, eliminating the need for testers to manually record or separately organize the data afterward. Furthermore, the control unit can quickly process and transmit data, ensuring that test data is recorded and presented in a timely manner. This saves time on data recording and organization, significantly improving the efficiency of the testing work, and is especially suitable for continuous testing scenarios involving a large number of oxygen sensors under test, enabling rapid and efficient completion of test data recording.

[0012] Optionally, the workbench grid is equipped with a display, which is electrically connected to the control unit of the device.

[0013] By adopting the above technical solution, the control unit transmits the real-time resistance data of the oxygen sensor under test detected by the resistance meter, along with the gas mixing parameters of the gas mixer and the environmental data inside the fume hood, to the display screen for real-time display. Test personnel do not need complex operations; through the intuitive screen display, they can quickly obtain key information during the testing process, promptly grasp the performance of the oxygen sensor under test in different gas environments, and facilitate real-time monitoring of the testing progress and rapid detection of data anomalies. The display can present data change trends in diverse forms such as charts and curves, such as the curve of the resistance of the oxygen sensor under test changing with time and gas composition. This helps test personnel analyze data more clearly and intuitively, quickly grasp the performance change patterns of the oxygen sensor under test, facilitate in-depth research and evaluation of test results, and provide more effective data support for the research and development and quality improvement of the oxygen sensor under test.

[0014] Optionally, some of the first threaded holes are arranged in a matrix.

[0015] By adopting the above technical solution, multiple first threaded holes are arranged in a matrix, allowing for the simultaneous installation of multiple oxygen sensors. This enables performance testing of multiple sensors in a single test, significantly improving testing efficiency and saving time and costs. The uniformly distributed oxygen sensors facilitate comparative analysis of test data, helping researchers comprehensively understand the performance differences of the sensors under the same mixed gas environment, thereby better evaluating the stability and reliability of the sensors. The matrix distribution is a regular and compact layout that fully utilizes the space on the side of the fume hood, allowing for the installation of more oxygen sensors within a limited space, making the test bench structure more rational and compact.

[0016] Optionally, the inner wall of the fume hood is provided with an anti-corrosion coating.

[0017] By employing the above technical solutions, the anti-corrosion coating can isolate corrosive gases from the inner wall of the fume hood, preventing corrosion of the inner wall material, thereby extending the service life of the fume hood and reducing equipment maintenance and replacement costs. If the inner wall of the fume hood is corroded, rust and peeling may occur. These impurities may mix into the gas mixture, affecting the purity and composition of the gas, and thus interfering with the test results of the oxygen sensor. The anti-corrosion coating can keep the inner wall of the fume hood clean and stable, ensuring that the testing environment is not affected by impurities, and improving the accuracy and reliability of the test results. The anti-corrosion coating typically has a smooth surface that does not easily attract dust and other contaminants, making the inner wall of the fume hood easier to clean.

[0018] Optionally, the outlet end of the connecting pipe is connected to a tapered pipe, and the outlet end of the tapered pipe is connected to the inlet end of the fume hood.

[0019] By adopting the above technical solution, a conical pipe is connected to the outlet end of the connecting pipe and connected to the inlet end of the fume hood, which can play a role in guiding and diffusing the gas. This allows the mixed gas prepared by the gas mixer to enter the fume hood more evenly and fully, effectively avoiding the problem of inconsistent atmosphere values ​​in different areas of the fume hood. This is beneficial to improving the uniformity of contact between the oxygen sensor to be tested and the mixed gas, thereby improving the accuracy of the test results.

[0020] Optionally, a guide impeller is provided between the air outlet end of the connecting pipe and the air inlet end of the conical pipe, a second threaded hole is provided on the pipe wall of the connecting pipe, a threaded rod is threadedly connected to the second threaded hole, and a third threaded hole is provided in the middle of the guide impeller, the threaded rod being adapted to the third threaded hole.

[0021] By adopting the above technical solution, the guide impeller can change the direction of airflow, allowing the gas flowing from the connecting pipe to enter the conical pipe more smoothly, improving the efficiency and stability of gas transmission. The guide impeller creates a vortex in the gas, which can mix the gas. This helps to ensure that gases of different components are fully and uniformly mixed before entering the conical pipe, ensuring that the gas composition encountered by the oxygen sensor under test is stable and representative, thereby improving the accuracy of the test results. The threaded rod is compatible with the threaded holes on the connecting pipe and the guide impeller, making the installation and removal of the guide impeller very convenient. During the debugging and maintenance of the test bench, the guide impeller can be easily removed for inspection, cleaning, or replacement.

[0022] Optionally, the threaded rod has an L-shaped structure.

[0023] By adopting the above technical solution, compared with ordinary straight threaded rods, the L-shaped structure is easier to grip and apply force, facilitating the adjustment of the guide impeller position for precise airflow control. The L-shaped threaded rod provides better stability during installation and use. After connecting to the connecting pipe and guide impeller, the L-shape's supporting effect reduces the swaying or displacement of the threaded rod under airflow impact or external force, thus ensuring the accuracy and stability of the guide impeller position and guaranteeing the precision and reliability of airflow regulation.

[0024] Optionally, the guide impeller includes a hub and a plurality of guide vanes evenly distributed on the hub.

[0025] By employing the above technical solution, the gas is propelled axially along the connecting pipe by the tilting angle and rotation of the guide vanes. This allows the gas to flow rapidly from the gas mixer to the fume hood, reducing the gas's residence time within the pipe and improving gas mixing efficiency. Simultaneously, the gas flow is also propelled by strong eddies and turbulence. This airflow motion facilitates thorough mixing of different gases, ensuring a more uniform mixture of gases exiting the gas mixer before entering the fume hood. This provides a more stable and uniform testing environment for the oxygen sensor under test, improving the accuracy of the test results.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. This application uses a gas mixing instrument to precisely mix multiple gases to form a specific gas mixture in a fume hood, and combines this with a resistance meter to detect the resistance in real time, thereby achieving accurate testing of the performance of the oxygen sensor under test.

[0028] 2. This application connects to gas pipelines for various gases via a gas mixer, which can precisely mix gases according to settings to simulate diverse test environments and meet the performance testing requirements of the oxygen sensor under test under different operating conditions.

[0029] 3. This application uses a propeller-structured guide impeller to efficiently drive multiple gases to flow rapidly and mix thoroughly within the connecting pipe, ensuring uniform and stable mixed gas within the fume hood and improving the testing accuracy of the oxygen sensor. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the workbench structure described in Embodiment 1;

[0031] Figure 2 This is a schematic diagram of the installation structure of the air intake interface and the air delivery pipeline described in Embodiment 1;

[0032] Figure 3 This is a schematic diagram of the installation structure of the first threaded hole and the oxygen sensor to be tested in Embodiment 1;

[0033] Figure 4 This is a schematic diagram of the installation structure of the connecting pipe and the tapered pipe described in Embodiment 2;

[0034] Figure 5 This is a cross-sectional view of the installation structure of the guide impeller and threaded rod described in Embodiment 2;

[0035] Figure 6 This is a schematic diagram of the guide impeller described in Embodiment 2.

[0036] In the diagram: 1. Workbench; 2. Gas distributor; 21. Inlet port; 211. Gas delivery pipe; 2111. Nitrogen pipe; 2112. Carbon monoxide pipe; 2113. Carbon dioxide pipe; 2114. Hydrogen pipe; 2115. Propane pipe; 2116. Air pipe; 22. Connecting pipe; 221. Guide impeller; 2211. Third threaded hole; 222. Second threaded hole; 2221. Threaded rod; 23. Conical pipe; 3. Fume hood; 31. First threaded hole; 311. Oxygen sensor to be tested; 32. Anti-corrosion coating; 4. Resistance meter; 5. Printer; 6. Monitor. Detailed Implementation

[0037] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Example 1

[0039] Reference Figures 1-3 This application discloses a gas-mixing oxygen sensor test bench. The workbench 1 is equipped with a gas mixer 2, a fume hood 3, and a resistance meter 4. The gas mixer 2 is provided with several air inlet ports 21, and the air inlet ports 21 are connected to gas delivery pipes 211 for conveying different gases. The air outlet of the gas mixer 2 is connected to the air inlet of the fume hood 3 through a connecting pipe 22. The gas mixer 2 mixes the gases in the different delivery pipes according to a set metering to form a mixed gas with a set atmosphere in the fume hood 3. Several first threaded holes 31 for installing the oxygen sensor 311 to be tested are opened on the side of the fume hood 3. The mixed gas discharged from the air outlet of the fume hood 3 can be discharged to the atmosphere after being treated by a purification device, or it can be discharged directly to the atmosphere. The sensing end of the oxygen sensor 311 to be tested extends into the fume hood 3 and contacts the mixed gas. The resistance meter 4 is electrically connected to the oxygen sensor 311 to be tested and is used to detect the real-time resistance of the oxygen sensor 311 to be tested.

[0040] Specifically, refer to Figure 1The workbench 1 is equipped with a printer 5, which, along with a resistance meter 4, is electrically connected to the equipment's control unit. The real-time resistance data of the oxygen sensor 311 detected by the resistance meter 4 is transmitted to the printer 5 in a timely manner via the electrical connection to the control unit. The printer 5 prints this data out in paper form, creating an intuitive test record. The workbench 1 is also equipped with a display 6, which is electrically connected to the equipment's control unit. The control unit transmits the real-time resistance data of the oxygen sensor 311 detected by the resistance meter 4, along with the gas mixing parameters of the gas mixer 2 and the environmental data inside the fume hood 3, to the display 6 for real-time display. The inner wall of the fume hood 3 is coated with an anti-corrosion coating 32, made of epoxy resin. Inside the fume hood 3, various gases, including nitrogen, carbon monoxide, carbon dioxide, hydrogen, propane, and air, are present. Some of these gases may be corrosive under certain conditions. Epoxy resin, with its stable molecular structure, is resistant to chemical reactions with these corrosive gases, effectively preventing erosion of the inner wall material of the fume hood 3 and protecting its structural integrity.

[0041] Reference Figure 2 The gas transmission pipeline 211 includes a nitrogen pipeline 2111, a carbon monoxide pipeline 2112, a carbon dioxide pipeline 2113, a hydrogen pipeline 2114, a propane pipeline 2115, and an air pipeline 2116; all gas transmission pipelines 211 are made of stainless steel.

[0042] Reference Figure 3 The outlet of the gas distributor 2 is connected to the inlet of the fume hood 3 via a connecting pipe 22. The first threaded holes 31 are distributed in a matrix. Multiple first threaded holes 31 are arranged in a matrix, allowing multiple oxygen sensors 311 to be installed simultaneously. This enables performance testing of multiple oxygen sensors 311 in a single test, greatly improving testing efficiency and saving time and costs.

[0043] The implementation principle of this embodiment is as follows: The gas inlet interface 21 of the gas mixer 2 is connected to the gas delivery pipe 211, which can accept various gases. The gas mixer 2, through its internal metering device, mixes the gases in different gas delivery pipes 211 according to a set ratio. The mixed gas enters the fume hood 3 through the connecting pipe 22, forming a mixed gas with a specific composition inside the hood, simulating the different gas environments that the oxygen sensor 311 may face during actual operation. The first threaded hole 31 on the side of the fume hood 3 is used to install the oxygen sensor 311, with its sensing end extending into the fume hood 3 to fully contact the mixed gas. Based on its internal reaction, the oxygen sensor 311 changes its resistance value according to the oxygen content in the surrounding gas, thus sensing the oxygen concentration in the environment. The resistance meter 4 is electrically connected to the oxygen sensor 311, collecting the resistance change data of the oxygen sensor 311 in real time, converting it into an electrical signal, and transmitting it to the display device. The operator can then obtain the performance parameters of the oxygen sensor 311 under different gas environments and complete the test and evaluation of the oxygen sensor 311.

[0044] Example 2

[0045] Reference Figures 4-6 The difference between this embodiment and Embodiment 1 is that the outlet end of the connecting pipe 22 is connected to a conical pipe 23, and the outlet end of the conical pipe 23 is connected to the inlet end of the fume hood 3; a guide impeller 221 is provided between the outlet end of the connecting pipe 22 and the inlet end of the conical pipe 23. The guide impeller 221 has a propeller structure. A second threaded hole 222 is provided on the pipe wall of the connecting pipe 22. A threaded rod 2221 is threadedly connected to the second threaded hole 222. The threaded rod 2221 has a right-angle structure. A third threaded hole 2211 is provided in the middle of the guide impeller 221. The threaded rod 2221 is adapted to the third threaded hole 2211. A sealing ring is also provided around the second threaded hole 222 to prevent gas leakage.

[0046] The implementation principle of this embodiment is as follows: the propeller-shaped impeller 221 guides and stirs the gas during the gas flow process. When the gas flows through the impeller 221, the propeller-shaped blades cause the gas to rotate, which enhances the mixing effect. Different gas components mix thoroughly during rotation, resulting in a more uniform and stable mixture entering the fume hood 3, which improves the accuracy of the oxygen sensor 311 test results. The threaded rod 2221 engages with the second threaded hole 222 on the wall of the connecting pipe 22 and the third threaded hole 2211 in the middle of the impeller 221, forming a connection structure. The right-angled structure of the threaded rod 2221 allows the operator to rotate it from the side without interfering with the airflow. A sealing ring is placed around the second threaded hole 222, primarily to prevent gas leakage. When the threaded rod 2221 is connected to the second threaded hole 222, the sealing ring is pressed between the contact surfaces of the threaded rod 2221 and the second threaded hole 222, filling any gaps. Because the sealing rings have good elasticity and sealing properties, they can effectively prevent gas from leaking out of these gaps, ensuring the airtightness of the entire gas delivery system. This is crucial for maintaining a stable gas environment inside the fume hood 3. Only with a good seal can the mixed gas with a specific atmosphere prepared by the gas distributor 2 be accurately delivered to the fume hood 3, providing a stable and accurate testing environment for the oxygen sensor 311 under test, thereby improving the reliability and repeatability of the test results.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A gas-mixing oxygen sensor test bench, comprising a workbench (1), characterized in that: The workbench (1) is equipped with a gas mixer (2), a fume hood (3) and a resistance meter (4). The gas mixer (2) is equipped with several air inlets (21), and the air inlets (21) are connected to gas delivery pipes (211) for delivering different gases. The outlet of the gas mixer (2) is connected to the air inlet of the fume hood (3) through a connecting pipe (22). The gas mixer (2) adjusts the gases in different delivery pipes according to the set metering to form a mixed gas with a set atmosphere in the fume hood (3). Several first threaded holes (31) for installing the oxygen sensor (311) to be tested are opened on the side of the fume hood (3). The sensing end of the oxygen sensor (311) to be tested extends into the fume hood (3) and contacts the mixed gas. The resistance meter (4) is electrically connected to the oxygen sensor (311) to be tested and is used to detect the real-time resistance of the oxygen sensor (311).

2. The gas-mixing oxygen sensor test bench according to claim 1, characterized in that: The gas pipeline (211) includes a nitrogen pipeline (2111), a carbon monoxide pipeline (2112), a carbon dioxide pipeline (2113), a hydrogen pipeline (2114), a propane pipeline (2115), and an air pipeline (2116).

3. The gas-mixing oxygen sensor test bench according to claim 1, characterized in that: The workbench (1) is equipped with a printer (5), and the printer (5) and the resistance meter (4) are electrically connected to the control unit of the equipment.

4. The gas-mixing oxygen sensor test bench according to claim 1, characterized in that: The workbench (1) is equipped with a display (6), which is electrically connected to the control unit of the device.

5. The gas-mixing oxygen sensor test bench according to claim 1, characterized in that: Several of the first threaded holes (31) are distributed in a matrix.

6. The gas-mixing oxygen sensor test bench according to claim 1, characterized in that: The inner wall of the fume hood (3) is provided with an anti-corrosion coating (32).

7. The gas-distribution type oxygen sensor test stand according to claim 1, characterized in that: The outlet of the connecting pipe (22) is connected to a tapered pipe (23), and the outlet of the tapered pipe (23) is connected to the inlet of the fume hood (3).

8. The gas-distribution type oxygen sensor test stand according to claim 7, characterized in that: A guide impeller (221) is provided between the air outlet end of the connecting pipe (22) and the air inlet end of the conical pipe (23). A second threaded hole (222) is provided on the pipe wall of the connecting pipe (22). A threaded rod (2221) is threadedly connected to the second threaded hole (222). A third threaded hole (2211) is provided in the middle of the guide impeller (221). The threaded rod (2221) is adapted to the third threaded hole (2211).

9. A gas-mixing oxygen sensor test bench according to claim 8, characterized in that: The threaded rod (2221) has an L-shaped structure.

10. A gas-mixing oxygen sensor test bench according to claim 8, characterized in that: The guide impeller (221) includes a hub and several guide vanes evenly distributed on the hub.

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