A gas path testing device

Abstract

This invention provides a gas path testing device, including a housing containing an inlet unit and an outlet unit. The inlet unit includes an inlet module, a first solenoid valve, and a first pressure gauge connected sequentially along the gas flow direction. The inlet module connects to multiple test gas sources and can individually control the connection between each test gas source and the first solenoid valve. The outlet of the first pressure gauge is connected to the inlet of the test pipeline. The outlet unit includes a second pressure gauge, a third solenoid valve, a flow meter, and a vacuum module connected sequentially along the gas flow direction. The inlet of the second pressure gauge is connected to the outlet of the test pipeline. This invention allows for convenient and efficient switching between different types or concentrations of test gas sources, adjustment of the test gas pressure, improved testing efficiency, avoidance of human error, flexible adaptation to different testing scenarios, and a modular design, making the testing device easy to maintain, highly stable, and allowing for the addition or removal of corresponding testing functions according to actual needs.

Description

Technical Field

[0001] This utility model relates to the field of pipeline testing technology, specifically to a gas path testing device. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] In fields such as aerospace life support systems, industrial gas analyzers, and laboratory environmental simulation devices, precise control and detection of gas flow under different oxygen concentrations and pressures are crucial. One of the core performance indicators of such equipment is its response accuracy, output stability, and gas path sealing under different oxygen concentrations and pressures. Therefore, it is necessary to conduct regular simulation tests on the aforementioned pipelines to ensure their operational stability.

[0004] Traditional airtightness testing often involves manually changing gas cylinders to switch between gas sources with different oxygen concentrations, and adjusting the gas pressure by regulating a proportional valve. The test is then conducted using the different gas sources. The procedure for each test is as follows: First, connect the air source to the air inlet of the test pipeline using a quick-connect fitting. The normal air intake is 200 kPa. Then, seal the air source pipeline at the air inlet. Next, connect the pressure gauge to the air outlet of the test pipeline using a compression fitting. Slowly release air from the inlet. The standard for releasing air is to stop at 50 kPa on the pressure gauge. Use a stopwatch to time the release. If the pressure gauge drops by less than 1 kPa within one minute, the air tightness of the test pipeline is qualified. Otherwise, it is unqualified.

[0005] However, the above testing methods are not only cumbersome, time-consuming, and inefficient, but also prone to human error during frequent switching (such as leakage caused by loose connection). They are also difficult to adapt flexibly to different testing scenarios (such as positive / negative pressure testing, static pressure holding / dynamic flow testing).

[0006] Therefore, in the research and development, production and quality inspection processes, there is a need for a highly reliable gas path testing device that can provide multiple standard oxygen sources, automatically switch between them and detect gas path parameters in real time. Utility Model Content

[0007] The main purpose of this invention is to provide a gas path testing device.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: a gas path testing device, including a housing, in which an air inlet unit and an air outlet unit are provided; The air intake unit includes an air intake module, a first solenoid valve, and a first pressure gauge connected sequentially along the gas flow direction. The air intake module is used to connect to multiple test gas sources and can control the connection between each test gas source and the first solenoid valve. The outlet of the first pressure gauge is connected to the air intake of the test pipeline. The gas outlet unit includes a second pressure gauge, a third solenoid valve, a flow meter, and a vacuum module connected sequentially along the gas flow direction. The inlet end of the second pressure gauge is connected to the outlet end of the test pipeline. The vacuum module is used to evacuate the test pipeline and control the gas pressure setting height in the test pipeline.

[0009] The beneficial effects of this utility model are reflected in: This utility model gas path testing device can conveniently and efficiently switch between different types or concentrations of test gas sources, adjust the gas pressure of the test gas source, improve testing efficiency, avoid introducing human error, flexibly adapt to different testing scenarios (such as positive / negative pressure testing, static pressure holding / dynamic flow testing), and the overall modular design makes the testing device easy to maintain and highly stable. Corresponding detection functions can be added or removed according to actual needs. Attached Figure Description

[0010] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of the entire utility model; Figure 2 for Figure 1 Schematic diagram of the middle air intake unit; Figure 3 for Figure 1 Schematic diagram of the central exhaust unit; Figure 4 for Figure 1 A top-down view of the overall structure.

[0011] Explanation of reference numerals in the attached figures: 1. Box body; 3. Panel; 4a. First proportional valve; 4b. Second proportional valve; 5a. First pressure gauge; 5b. Second pressure gauge; 6. First air chamber; 7. Base plate; 8a. First solenoid valve; 8b. Second solenoid valve; 8c. Third solenoid valve; 8d. Fourth solenoid valve; 9. Second air chamber; 10a. First check valve; 10b. Second check valve; 11. Through-plate connector; 12. Built-in vacuum pump; 13. Altimeter; 14. Simulated cockpit; 15. Fifth solenoid valve; 16. Third air chamber; 17. Flow meter; 18. Fourth air chamber; 19. Fifth air chamber. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the utility model without creative effort are within the scope of protection of the utility model.

[0013] Please combine Figure 1 and Figure 4 .

[0014] A gas path testing device includes a housing 1, in which an air inlet unit and an air outlet unit are provided; The air intake unit includes an air intake module, a first solenoid valve 8a, and a first pressure gauge 5a connected sequentially along the gas flow direction. The air intake module is used to connect to multiple test gas sources and can control the connection between each test gas source and the first solenoid valve 8a. The outlet end of the first pressure gauge 5a is connected to the air intake end of the test pipeline. The gas outlet unit includes a second pressure gauge 5b, a third solenoid valve 8c, a flow meter 17, and a vacuum module connected sequentially along the gas flow direction. The inlet end of the second pressure gauge 5b is connected to the outlet end of the test pipeline. The vacuum module is used to evacuate the test pipeline and control the set height of the gas pressure in the test pipeline.

[0015] In practical implementation, the gas path testing device of this application is illustrated by taking the detection of the air tightness of the test pipeline as an example: Before testing, connect the air intake module of the air intake unit to the pre-selected test air source, connect the outlet of the first pressure gauge 5a to the air intake of the test pipeline, and connect the air intake of the second pressure gauge 5b to the air outlet of the test pipeline.

[0016] During testing, the original gas in the test pipeline is first evacuated using the vacuum module. The evacuation stops when the gas pressure in the test pipeline drops to a set height. Then, the first solenoid valve 8a is opened, and the test gas source is input into the test pipeline through the air intake module. After that, the first solenoid valve 8a and the third solenoid valve 8c are closed. The readings of the first pressure gauge 5a and the second pressure gauge 5b are read. After waiting for a predetermined time, the readings of the first pressure gauge 5a and the second pressure gauge 5b are read again. If the decrease in the gas pressure values ​​shown by the first pressure gauge 5a and the second pressure gauge 5b is less than 1 kPa, it indicates that the airtightness test of the test pipeline is qualified. If the decrease in the gas pressure values ​​is greater than or equal to 1 kPa, it indicates that the airtightness test of the test pipeline is unqualified.

[0017] The advantage of this design is that it allows for convenient and efficient switching between different types or concentrations of test gas sources according to actual testing needs, adjustment of the gas pressure of the test gas source, improvement of testing efficiency, avoidance of human error, and flexible adaptation to different testing scenarios (such as positive / negative pressure testing, static pressure holding / dynamic flow testing).

[0018] It should be added that the bottom of the first pressure gauge 5a is installed on the top of the first air chamber 6, and the bottom of the first air chamber 6 is fixed to the bottom plate 7 on the bottom side of the box body 1. The first air chamber 6 is equivalent to a three-way valve, and its two ends are respectively connected to the air outlet of the first solenoid valve 8a and the air inlet of the first proportional valve 4a. The bottom of the second pressure gauge 5b is installed on the top of the fifth air chamber 19, and the bottom of the fifth air chamber 19 is fixed to the bottom plate 7 on the bottom side of the box body 1. The fifth air chamber 19 is equivalent to a three-way valve, and its two ends are respectively connected to the air outlet of the second one-way valve 10b and the air inlet of the third solenoid valve 8c.

[0019] In one embodiment, the air intake module includes a second air chamber 9, the outlet of which is connected to the air intake of the first pressure gauge 5a. The second air chamber 9 has multiple air intakes, and each of these multiple air intakes is connected to a second solenoid valve 8b. The air intakes of the multiple second solenoid valves 8b can be connected to various test air sources respectively. Specifically: The second air chamber 9 has five air inlets, the second solenoid valve 8b has five types, and the test air source has five types.

[0020] Preferably, the test gas sources are oxygen with concentrations of 5%, 25%, 50%, 75%, and 100%.

[0021] Thus, during the test, the second solenoid valve 8b of one of the air intake modules can be energized and opened to allow the selected test gas source to enter the test pipeline. At this time, the other four second solenoid valves 8b are closed, and the gas passes through the second solenoid valve 8b, the second air chamber 9, the first solenoid valve 8a and the first pressure gauge 5a to the test pipeline to participate in the airtightness test.

[0022] In one embodiment, a first one-way valve 10a is provided between each of the multiple air inlets of the second air chamber 9 and each of the second solenoid valves 8b.

[0023] Thus, the first one-way valve 10a can limit the gas flow direction of the test gas source in the intake unit to one direction.

[0024] In one embodiment, the outlet of the first pressure gauge 5a is connected to a first proportional valve 4a, and the outlet of the first proportional valve 4a is connected to the inlet of the test pipeline.

[0025] Thus, during the test, the test gas pressure can be set and adjusted through the first proportional valve 4a in the air intake unit. By closing the first solenoid valve 8a and the third solenoid valve 8c, and observing the readings of the first pressure gauge 5a and the second pressure gauge 5b, the airtightness performance of the test pipeline can be detected.

[0026] In one embodiment, the inlet of the second pressure gauge 5b is connected to a second one-way valve 10b, and the outlet of the second pressure gauge 5b is connected to a fourth air chamber 18. The outlet of the fourth air chamber 18 is connected to the inlet of the flow meter 17, and the outlet of the flow meter 17 is connected to a third air chamber 16. Both outlets of the third air chamber 16 are connected to a fourth solenoid valve 8d. One of the fourth solenoid valves 8d is used for venting, and the outlet of the other fourth solenoid valve 8d is connected to a vacuum module.

[0027] Thus, the second one-way valve 10b can limit the gas flow direction of the test gas source in the gas outlet unit to one direction. By opening one of the fourth solenoid valves 8d on the third gas chamber 16 for venting, excess gas in the test pipeline can be vented before and after the test. By opening the other fourth solenoid valve 8d on the third gas chamber 16, the vacuum module can be allowed to perform vacuuming operations on the test pipeline.

[0028] In one embodiment, the vacuum module includes a simulated cabin 14 for expanding the buffer gas space and slowing down the rate of change of gas pressure and composition. The air inlet of the simulated cabin 14 is connected to the air outlet of a corresponding fourth solenoid valve 8d. One of the air outlets of the simulated cabin 14 is connected to an altimeter 13 for reading the air pressure and altitude values ​​in the simulated cabin 14, and the other air outlet is connected to a fifth solenoid valve 15. One of the air outlets of the fifth solenoid valve 15 is connected to a built-in vacuum pump 12, and the other air outlet can be connected to an external vacuum pump.

[0029] It should be noted that the simulated cockpit 14 is a conventional box structure with a certain amount of internal space (ensuring a volume of 500 cubic centimeters) to expand the buffer gas space, slow down the rate of change in gas pressure and composition, and work with the altimeter 13 to read the altitude value of the simulated cockpit 14 as an altitude standard (the altitude standard is determined by measuring the air pressure of the surrounding environment (for every 100 meters increase in altitude, the atmospheric pressure decreases by about 1 kPa)).

[0030] In addition, the built-in vacuum pump 12 has limited operating power. When it is necessary to perform vacuuming operations on the test pipeline that exceed the operating power of the built-in vacuum pump 12, an external vacuum pump with higher operating power can be connected to the corresponding outlet of the fifth solenoid valve 15. At the same time, the fifth solenoid valve 15 is controlled to cut off the pipeline connection between it and the built-in vacuum pump 12, so that the pipeline between the fifth solenoid valve 15 and the external vacuum pump is connected to meet the high-power vacuuming needs.

[0031] In one embodiment, a second proportional valve 4b is provided between the air outlet of the simulated cockpit 14 and the air inlet of the fifth solenoid valve 15.

[0032] Thus, the test gas pressure can be set and adjusted through the second proportional valve 4b in the gas outlet unit during the test.

[0033] Preferably, the first solenoid valve 8a, the second solenoid valve 8b, the third solenoid valve 8c and the fourth solenoid valve 8d are all single-position two-way solenoid valves, and the fifth solenoid valve 15 is a two-position three-way solenoid valve.

[0034] In addition, the bottom wall of the box 1 serves as the base plate 7, and both the air intake and air exhaust units are mounted on the base plate 7. Multiple sets of panels 3 are installed on the front side wall of the box 1. The first proportional valve 4a in the air intake unit and the five second solenoid valves 8b near the test air source are each equipped with a through-plate connector 11. The second one-way valve 10b in the air exhaust unit and the fifth solenoid valve 15 corresponding to the external vacuum pump are each equipped with a through-plate connector 11. Each through-plate connector 11 is inserted into the corresponding panel 3 to protrude and fix it to the front side wall of the box 1 for easy connection.

[0035] The second solenoid valve 8b in the air intake module is connected to the air intake end of the first one-way valve 10a via a compression fitting, forming a modular design. This makes the test device easy to maintain and highly stable. The corresponding detection functions can be added or removed in the housing 1 according to actual needs.

[0036] It should be noted that the through-plate connector 11 and the compression fitting in this application are existing pipe connection joint structures, and this application will not elaborate on them further.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0038] It should be noted that if the utility model embodiment involves directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0039] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, if the utility model embodiments involve descriptions of "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the utility model.

Claims

1. An air path testing device, characterized by, Includes a box body (1), in which an air intake unit and an air outlet unit are provided; The air intake unit includes an air intake module, a first solenoid valve (8a), and a first pressure gauge (5a) connected sequentially along the gas flow direction. The air intake module is used to connect to multiple test gas sources and can control each test gas source to connect to the first solenoid valve (8a) respectively. The outlet end of the first pressure gauge (5a) is connected to the air intake end of the test pipeline. The gas outlet unit includes a second pressure gauge (5b), a third solenoid valve (8c), a flow meter (17), and a vacuum module connected sequentially along the gas flow direction. The inlet end of the second pressure gauge (5b) is connected to the outlet end of the test pipeline. The vacuum module is used to evacuate the test pipeline and control the gas pressure setting height in the test pipeline.

2. The air path testing device of claim 1, wherein, The air intake module includes a second air chamber (9), the outlet of the second air chamber (9) is connected to the air intake of the first pressure gauge (5a), the second air chamber (9) has multiple air intakes, and each of the multiple air intakes is connected to a second solenoid valve (8b), and the air intakes of the multiple second solenoid valves (8b) can be connected to various test air sources respectively.

3. The air path testing device of claim 2, wherein, The second air chamber (9) has five air inlets, the second solenoid valves (8b) have five types, and the test air source has five types.

4. The air path testing device of claim 2, wherein, Each of the multiple air inlets of the second air chamber (9) is provided with a first check valve (10a) between each of the second solenoid valves (8b).

5. The air path testing device of claim 1, wherein, The first pressure gauge (5a) has a first proportional valve (4a) connected to its outlet end, and the outlet end of the first proportional valve (4a) is connected to the inlet end of the test pipeline.

6. The gas path testing apparatus according to any one of claims 1 to 5, characterized in that, The second pressure gauge (5b) has a second one-way valve (10b) connected to its inlet end, and a fourth air chamber (18) connected to its outlet end. The outlet end of the fourth air chamber (18) is connected to the inlet end of the flow meter (17). The outlet end of the flow meter (17) is connected to a third air chamber (16). Both outlet ends of the third air chamber (16) are connected to a fourth solenoid valve (8d). One of the fourth solenoid valves (8d) is used for venting, and the outlet end of the other fourth solenoid valve (8d) is connected to the vacuum module.

7. The air path testing device of claim 6, wherein, The vacuum module includes a simulated cabin (14) for expanding the buffer gas space and slowing down the rate of change of gas pressure and composition. The air inlet of the simulated cabin (14) is connected to the air outlet of the corresponding fourth solenoid valve (8d). One of the air outlets of the simulated cabin (14) is connected to an altimeter (13) for reading the air pressure and altitude values ​​in the simulated cabin (14), and the other air outlet is connected to a fifth solenoid valve (15). One of the air outlets of the fifth solenoid valve (15) is connected to a built-in vacuum pump (12), and the other air outlet can be connected to an external vacuum pump.

8. The air path testing device of claim 7, wherein, A second proportional valve (4b) is provided between the air outlet of the simulated cockpit (14) and the air inlet of the fifth solenoid valve (15).

9. The air path testing device of claim 8, wherein, The first solenoid valve (8a), the second solenoid valve (8b), the third solenoid valve (8c) and the fourth solenoid valve (8d) are all single-position two-way solenoid valves, and the fifth solenoid valve (15) is a two-position three-way solenoid valve.

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