Nitrogen-oxygen sensor test pipeline

Abstract

The utility model provides a nitrogen-oxygen sensor testing pipeline which comprises a heat preservation pipeline with two ends arranged in a penetrating mode and a plurality of communicating openings formed in the top of the heat preservation pipeline in a communicating mode, and the communicating openings are matched with nitrogen-oxygen sensors or thermocouples. The output end of the hot air pipeline is communicated with the input end of the heat preservation pipeline; wherein the thermocouple is configured to measure the temperature of air introduced into the heat preservation pipeline. According to the nitrogen-oxygen sensor testing pipeline, the input end of the heat preservation pipeline is communicated with the hot gas pipeline, so that the hot gas pipeline outputs hot gas to the heat preservation pipeline, and after air in the heat preservation pipeline meets the specified temperature, mixed gas is introduced into the heat preservation pipeline, and measurement is started.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen oxide sensor testing, in particular to a nitrogen oxide sensor testing pipeline. Background Art

[0002] The nitrogen oxide sensor monitors the tail gas nitrogen oxide emissions and is used for the tail gas treatment of diesel and gasoline engines. The nitrogen oxide sensor is still an important tail gas measurement tool. Cooperating with the truck aftertreatment system to ensure that the vehicle tail gas meets the emission standards. During the processing of the nitrogen oxide sensor, it is usually necessary to test whether the product meets the standards.

[0003] In the prior art, a combined gas needs to be introduced into the nitrogen oxide sensor for testing. Currently, the introduced gas is at room temperature. However, in actual use, the nitrogen oxide sensor probe is inserted into the exhaust pipe, and the gas temperature in the exhaust pipe is three or four hundred degrees Celsius at this time. Therefore, the existing test environment does not closely approximate the actual use environment, and the gas introduced during internal testing cannot be heated, resulting in inaccurate testing. Summary of the Utility Model

[0004] The utility model provides a nitrogen oxide sensor testing pipeline, which solves the problem in the prior art that the gas introduced during internal testing cannot be heated, resulting in inaccurate testing.

[0005] The technical solution of the utility model is realized as follows:

[0006] A nitrogen oxide sensor testing pipeline includes a heat-insulating pipeline with both ends penetrating, and a plurality of communication ports connected to the top thereof. The communication ports are adapted to nitrogen oxide sensors or thermocouples; it also includes a hot gas pipeline, and the output end of the hot gas pipeline is connected to the input end of the heat-insulating pipeline; wherein the thermocouple is configured to measure the temperature of the air introduced into the heat-insulating pipeline.

[0007] Further, a mixed gas inlet is provided on one side of the heat-insulating pipeline.

[0008] Further, it also includes a heating device, and the hot gas pipeline is heated by the heating device so that the air introduced into the heat-insulating pipeline is hot gas.

[0009] Further, the middle of the hot gas pipeline is spirally designed and extends into the heating cavity of the heating device.

[0010] Further, the outside of the heat-insulating pipeline is wound with heat-insulating cotton.

[0011] Further, the connection between the hot gas pipeline and the heat-insulating pipeline is detachable.

[0012] The beneficial effects brought by the technical solution provided by this application:

[0013] 1. The nitrogen oxide sensor test pipeline is connected to the hot gas pipeline through the input end of the heat-insulating pipeline, so that the hot gas pipeline outputs hot gas to the heat-insulating pipeline. After the air in the heat-insulating pipeline reaches the specified temperature, a mixed gas is introduced into the heat-insulating pipeline to start the measurement.

[0014] 2. The nitrogen oxide sensor test pipeline is provided with a heating pipeline and an external heating device at the front end of the heat-insulating pipeline. The design of the multi-turn elbow of the heating pipeline can store more gas, and it is fully heated in the external heating device to raise the temperature of the gas entering the heat-insulating pipeline and prevent it from cooling too quickly, effectively simulating the actual use environment of the exhaust pipe, making the test of the nitrogen oxide sensor closer to the actual situation and improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the nitrogen oxide sensor test pipeline of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the nitrogen oxide sensor test pipeline of the present invention.

[0018] In the figure: 10 is the heat-insulating pipeline, 11 is the nitrogen oxide sensor, 12 is the thermocouple, 13 is the connection port, 14 is the mixed gas inlet; 20 is the hot gas pipeline, 30 is the heating device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Refer to Figure 1-2, The nitrogen oxide sensor test pipeline includes a heat-insulating pipeline 10 with both ends penetrating, and a plurality of communication ports 13 connected to the top thereof. The heat-insulating pipeline 10 is the main part of the test pipeline, with both ends penetrating, for passing the test gas. The communication ports 13 are adapted to the nitrogen oxide sensor 11 or the thermocouple 12. The communication ports 13 are arranged on the top of the heat-insulating pipeline 10 for adapting the nitrogen oxide sensor 11 or the thermocouple 12 to perform tests and temperature measurements. Among them, the nitrogen oxide sensor 11 is used to monitor the nitrogen oxide emissions in the exhaust gas. The thermocouple 12 is used to measure the temperature of the gas inside the heat-insulating pipeline to ensure that the temperature of the test environment matches the actual use environment. It also includes a hot gas pipeline 20, and the output end of the hot gas pipeline 20 is connected to the input end of the heat-insulating pipeline 10 for conveying the heated gas into the heat-insulating pipeline.

[0021] The hot gas pipeline 20 is responsible for conveying the heated gas into the heat-insulating pipeline 10 to simulate the high-temperature environment in the exhaust pipe during actual use. Through the heating effect of the hot gas pipeline 20, it can ensure that the gas introduced into the heat-insulating pipeline 10 reaches a high-temperature state similar to that in the actual exhaust pipe. In this way, when the nitrogen oxide sensor 11 or the thermocouple 12 is inserted into the heat-insulating pipeline 10 for testing, they will be in an environment closer to the actual use conditions, thereby improving the accuracy of the test. The thermocouple 12 is used to monitor the temperature inside the heat-insulating pipeline in real time to ensure the precise control and recording of the temperature during the test.

[0022] Furthermore, a mixed gas inlet 14 is provided on one side of the heat-insulating pipeline 10. In the original design of the nitrogen oxide sensor test pipeline, the setting of the mixed gas inlet 14 is further added. This mixed gas inlet 14 is located on one side of the heat-insulating pipeline 10 for introducing the required test gas into the pipeline. The design of the mixed gas inlet 14 allows for the precise control and adjustment of the type and proportion of the gas entering the heat-insulating pipeline during the test to simulate the gas composition in the actual engine exhaust.

[0023] According to the specifications and test requirements of the nitrogen oxide sensor 11 to be tested, the corresponding mixed gas is prepared. These gases may include nitrogen oxides, oxygen, carbon dioxide, water vapor, etc., and their proportion and type need to be precisely controlled to simulate the actual exhaust gas components. When the temperature inside the heat-insulating pipeline 10 reaches the set target temperature through the monitoring of the hot gas pipeline 20 and the thermocouple 12, the prepared mixed gas is introduced into the heat-insulating pipeline 10 through the mixed gas inlet 14. After the mixed gas enters the heat-insulating pipeline 10 through the mixed gas inlet 14, it mixes with the existing gas in the pipeline and is evenly distributed. This step ensures that the nitrogen oxide sensor 11 can come into contact with a gas environment similar to the actual use conditions. After the mixed gas is stable, the nitrogen oxide sensor 11 is activated to start measuring the concentration of nitrogen oxides in the mixed gas. The thermocouple 12 continues to monitor the temperature inside the heat-insulating pipeline to ensure the stability of the test conditions.

[0024] Furthermore, it also includes a heating device 30. The hot air pipe 20 is heated by the heating device 30 so that the air flowing into the heat preservation pipe 10 is hot air. The heating device 30 is a key component connected to the hot air pipe 20, and its main function is to heat the air conveyed through the hot air pipe 20. In this way, when the air passes through the heating device 30, it will be heated to a specific temperature and then conveyed to the heat preservation pipe 10 through the hot air pipe 20, ensuring that the air flowing into the heat preservation pipe 10 is hot air, thereby simulating the high-temperature conditions in the actual use environment.

[0025] Before the test starts, first start the heating device 30 and set the required target temperature. This target temperature is usually based on the temperature conditions inside the exhaust pipe during actual use. The air is conveyed through the hot air pipe 20 to the heating device 30 and is heated to the set target temperature inside the heating device. The heating device 30 can be an electric heater, a heat exchanger, or other types of heating devices that can provide a stable and controllable heat source.

[0026] Among them, the middle part of the hot air pipe 20 is in a spiral design and extends into the heating chamber of the heating device 30. This further refines the structure of the hot air pipe 20. The middle part of the hot air pipe 20 is designed in a spiral shape. The spiral-shaped pipe increases the contact area between the pipe and the heating chamber, thereby improving the heat exchange efficiency. The spiral design enables the air to be heated more evenly when passing through the heating device 30, and the spiral shape can provide a longer heating path within a limited space.

[0027] Furthermore, the outside of the heat preservation pipe 10 is wrapped with heat insulation cotton. The main function of the heat insulation cotton is to reduce heat loss, maintain the high-temperature environment inside the pipe, and at the same time prevent the external environment from interfering with the test environment. The selection and application of the heat insulation cotton need to consider its heat insulation performance, heat resistance, and whether it is easy to install and maintain.

[0028] During the manufacturing or installation process of the heat preservation pipe 10, the heat insulation cotton is wrapped around the outside of the pipe. This wrapping can be in a spiral shape or continuous coverage to ensure that the entire pipe surface is covered with the heat insulation material. When the heating device 30 conveys hot air into the heat preservation pipe 10 through the hot air pipe 20, the function of the heat insulation cotton is to reduce the heat dissipation outside the pipe. In this way, the high-temperature environment inside the pipe can be maintained, simulating the high-temperature conditions of the exhaust pipe during actual use. The heat insulation cotton can also play a role in isolating the external environment and preventing the external temperature change from affecting the test environment. This is particularly important for conducting tests under different environmental conditions to ensure the consistency and repeatability of the test results.

[0029] Furthermore, the hot gas pipeline 20 and the insulation pipeline 10 are detachably connected. This design allows the hot gas pipeline 20 to be easily detached from the insulation pipeline 10 when maintenance, cleaning, or replacement is required, without the need for large-scale disassembly of the entire test system.

[0030] The detachable connection methods include but are not limited to quick connectors, clamp connections, flange connections, threaded connections, ferrule connections, plug connections, or vacuum quick connectors. These connection methods can be selected according to different application requirements and environmental conditions to ensure the flexibility, safety, and reliability of the system.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A nitrogen oxide sensor test pipeline, characterized in that, It includes a heat-insulating pipe (10) with both ends penetrating through and a plurality of communication ports (13) communicatively connected to the top thereof, and a nitrogen-oxygen sensor (11) or a thermocouple (12) is adapted to the communication port (13); it further includes a hot gas pipe (20), and the output end of the hot gas pipe (20) is communicatively connected to the input end of the heat-insulating pipe (10); wherein the thermocouple (12) is configured to measure the temperature of the air introduced into the heat-insulating pipe (10).

2. The nitrogen-oxygen sensor test pipeline according to claim 1, characterized in that, A mixture gas inlet (14) is provided on one side of the heat-insulating pipe (10).

3. The nitrogen-oxygen sensor test pipeline according to claim 1, characterized in that, It further includes a heating device (30), and the hot gas pipe (20) is heated by the heating device (30) so that the air introduced into the heat-insulating pipe (10) is hot gas.

4. The nitrogen-oxygen sensor test pipeline according to claim 3, characterized in that, The middle of the hot gas pipe (20) is spirally designed and extends into the heating cavity of the heating device (30).

5. The nitrogen oxide sensor test pipeline according to claim 1, characterized in that, The outside of the heat-insulating pipe (10) is wound with heat-insulating cotton.

6. The nitrogen oxide sensor test pipeline according to claim 1, characterized in that The connection between the hot gas pipe (20) and the heat-insulating pipe (10) is a detachable connection.

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