A method of preparing a pressure test

Abstract

The application relates to a preparation method of a measurement test, belonging to the technical field of wind tunnel measurement. In order to solve the problem of low efficiency of the preparation process of the wind tunnel measurement test, the application is connected with a rough test device; rough measurement and positioning are carried out; a pressure generator is used to inject pressure into a pressure measuring hose, the aeration condition of the pressure measuring hose is checked, a coding label is arranged on a pressure measuring point and the pressure measuring hose qualified in rough measurement, and an initial corresponding relationship including the number of the pressure measuring point qualified in rough measurement and the number of the pressure measuring hose is recorded synchronously; the performance of an electronic scanning valve is pre-inspected; the air outlet pipeline of the electronic scanning valve qualified in the pre-inspection is randomly connected to the pressure measuring hose qualified in rough measurement, and the corresponding relationship between the number of the pressure measuring hose qualified in rough measurement and the channel number of the electronic scanning valve is recorded; a multi-channel scanning system reorders the pressure measuring points and the electronic scanning valve channels according to different rules, and a new mapping relationship between the pressure measuring points and the electronic scanning valve is obtained; quantitative air tightness fine measurement is carried out, and the preparation work of the measurement test is completed.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel measurement technology, specifically relating to a preparation method for pressure measurement tests. Background Technology

[0002] In wind tunnel pressure testing, the airtightness of the pressure testing pipeline and the accuracy of the correspondence between pressure testing points and pipelines are key factors determining the reliability of test data. Traditional test preparation methods have the following technical defects: Coarse correspondence calibration: Manual marking of pressure testing points and hoses is prone to errors, leading to confusion in the "pressure testing point-hose-acquisition channel" correspondence, with a data matching error rate as high as 12%-15%; Insufficient airtightness detection accuracy: Qualitative detection relying solely on manual observation of pressure gauges cannot quantitatively assess minute leaks (e.g., leaks with pressure changes ≤50Pa within 10 seconds are easily missed), resulting in data jumps or abnormal fluctuations during the test; Low equipment integration: Each testing stage relies on independent equipment (e.g., manual pressure pumps, distributed sensors), making the operation process cumbersome. The preparation time for 100 pressure testing points typically exceeds 120 minutes, and there is a lack of data traceability capabilities.

[0003] For large-scale pressure testing, additional problems exist: low connection efficiency: pressure testing hoses must be connected one-to-one with scanning valve channels according to their numbers. A single channel connection takes about 30 seconds, and the pipeline connection time for 1000-point tests requires 500 minutes. Moreover, data corruption is easily caused by human error in connection. Lack of sorting flexibility: when pressure testing points need to be recombined according to spatial distribution (such as spanwise or bridge cross-section) or pressure gradient during the test, physical connections need to be manually adjusted, which is cumbersome and can easily damage the pipeline. Insufficient software collaboration: existing data acquisition software only supports fixed channel mapping and cannot achieve dynamic sorting based on the correspondence of random connections, which restricts the optimization of the process for large-scale tests. Summary of the Invention

[0004] The problem this invention aims to solve is to improve the preparation efficiency of wind tunnel pressure testing, and proposes a preparation method for pressure testing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing a pressure test includes the following steps:

[0007] S1. Connect the coarse testing device: Connect one end of each pressure measuring point on the model to one end of each pressure measuring hose, connect the other end of each pressure measuring hose to the pipeline parallel device, connect the other end of the pipeline parallel device to the high-pressure resistant air pipe, and connect the high-pressure resistant air pipe to the pressure generator;

[0008] S2. Perform coarse measurement and positioning: Use a pressure generator to inject pressure into the pressure testing hose, check the air circulation of the pressure testing hose, and code and label the pressure testing points and the pressure testing hoses that pass the coarse measurement. Simultaneously record the initial correspondence between the pressure testing point number and the pressure testing hose number in an electronic table.

[0009] S3. Pre-inspection of electronic scanning valve performance: After the rough test is completed, disconnect the pressure testing hose and pipeline parallel device that passed the rough test. Connect the air inlet pipeline of the electronic scanning valve used for the pressure test to the pressure generator through the pipeline parallel device. Then test the electronic scanning valve. If the electronic scanning valve fails the test, the parts need to be replaced and the test needs to be repeated to ensure the stability of the air path of the electronic scanning valve.

[0010] S4. Randomly connect the air outlet line of the pre-inspection qualified electronic scanning valve to the pressure testing hose that passed the coarse test, record the correspondence between the pressure testing hose number that passed the coarse test and the electronic scanning valve channel number, and form the original mapping dataset;

[0011] S5. Based on the initial correspondence table of the pressure test point numbers and pressure test hose numbers obtained in step S2 and the original mapping dataset obtained in step S4, the multi-channel scanning system sorts the pressure test points and electronic scanning valves to obtain the initial mapping dataset of pressure test points and electronic scanning valves.

[0012] S6. Quantitative airtightness measurement: Based on the initial mapping dataset of the pressure measurement points and electronic scanning valve obtained in step S5, the pressure generator connects to the pressure measurement points through the electronic scanning valve to perform quantitative airtightness measurement. The multi-channel scanning system receives the pressure data of the pressure measurement points collected by the electronic scanning valve in real time, completing the preparation work for the pressure test.

[0013] Furthermore, the pipeline parallel connection device in step S1 has an aluminum alloy shell and a sealed cavity inside. The air inlet has one pipeline for connecting to a high-pressure resistant gas pipe, and the air outlet is equipped with multiple stainless steel capillary tubes for connecting multiple pressure measuring hoses, thereby realizing the parallel connection of multiple pipelines into one pipeline.

[0014] Furthermore, the high-pressure gas generated by the pressure generator in step S1 is switched on and off at high speed via a foot switch, a control module, and a high-speed solenoid valve.

[0015] Furthermore, in step S2, the pressure generator injects 30 kPa pressure into the high-pressure air pipe to check whether there is any blockage or leakage at the pressure measuring point.

[0016] Furthermore, step S3 involves testing the electronic scanning valve by using a pressure generator to supply a reference pressure P0 equal to half the electronic scanning valve's range, and continuously monitoring for 5 minutes. Pressure data for each channel is collected, where the pressure data for the i-th channel is P. i Calculate the measurement deviation at each point. and population standard deviation :

[0017]

[0018]

[0019] in, for The overall average value, where n is the total number of channels;

[0020] like ≤0.05%FS, where FS is the full scale, and If the pressure is ≤5Pa, the scanning valve is considered qualified. For unqualified electronic scanning valves, replace the parts and retest. Ensure the stability of the valve block air path during measurement.

[0021] Furthermore, the electronic scanning valve in step S3 is a 64-channel electronic scanning valve.

[0022] Furthermore, the specific implementation method of step S5 includes the following steps:

[0023] S5.1. Activate the multi-channel scanning system, which includes cascaded electronic scanning valves, an electronic scanning valve, a pressure measuring host, and an industrial-grade control computer connected in sequence. A single pressure measuring host supports the synchronous detection of 1-512 pressure measuring points, and the data is transmitted in real time via RJ45 Ethernet.

[0024] S5.2. Reorder the pressure measurement points within the industrial control computer of the multi-channel scanning system. The reordering method includes the following steps:

[0025] S5.2.1. Set spatial coordinate sorting: Set the X-axis to ascending order from the front end to the back end of the model, and the Y-axis to hierarchical order for the left or right wing partitions of the model, generating a new data arrangement mapping;

[0026] S5.2.2. Set pressure gradient sorting: Based on pre-test data, reorganize the channel order according to pressure values ​​from smallest to largest;

[0027] S5.2.3. Set custom sorting rules: Set sorting logic through drag-and-drop interface, including skipping fault points or arranging by odd and even number intervals.

[0028] Furthermore, in step S6, the method for quantitative airtightness measurement involves injecting a standard pressure P0 (half the range of the electronic scanning valve) into a single pressure measurement point using a pressure generator. After controlling the solenoid valve to cut off the air path, the pressure holding stage begins. The industrial control computer then collects pressure data P within 10 seconds at a frequency of 100Hz in real time. 10 Calculate the pressure change ΔP = |P 10-P0|;If ΔP>30Pa, manually check the hose joints or sealing devices until all channels pass the test. During each test, the test data is automatically stored in the industrial control computer.

[0029] The beneficial effects of this invention are:

[0030] The present invention provides a method for preparing a pressure test, which enables graded verification to improve reliability; through coarse testing, obvious blockages / leakage points can be quickly eliminated (efficiency improved by 40%), and fine testing can achieve quantitative air tightness detection (pressure change ≤30Pa in 10s), reducing the overall detection error rate from 8% in traditional methods to 1.5%.

[0031] The pressure test preparation method described in this invention achieves intelligent integration and improves efficiency; the detection time for 500 pressure test points is reduced from 300 minutes to 150 minutes, and it supports full-link data traceability before the test.

[0032] The pressure test preparation method described in this invention achieves compatibility and scalability; the system supports cascading of pressure test points of different specifications and scanning valves of multiple brands (DSI / PSI, etc.), and is suitable for flexible configuration from small models (50 points) to large-scale tests (more than 500 points).

[0033] The pressure test preparation method described in this invention significantly improves connection efficiency; the connection time for 1000 pressure test points using a random connection method is reduced from 500 minutes in the traditional method to 180 minutes (a reduction of 64%), avoiding the time-consuming manual matching of numbers.

[0034] The present invention provides a method for preparing a pressure test, which enhances the flexibility of the test; it supports adjusting the sorting rules at any time during the test (such as when changing the model cross section, only the coordinate table needs to be re-imported), without changing the physical connection, and the adjustment time is reduced from 1 hour to 5 minutes.

[0035] The pressure test preparation method described in this invention ensures data consistency; the sorting and scanning valve acquisition system are synchronized in real time to ensure that the displayed, stored, and analyzed data are always arranged in logical order, eliminating the risk of errors in subsequent data reassembly. Attached Figure Description

[0036] Figure 1 This is a flowchart of a preparation method for a pressure test according to the present invention;

[0037] Figure 2 This is a structural block diagram of a pressure test preparation method according to the present invention;

[0038] Figure 3 This is a schematic diagram of the pipeline parallel connection device of the present invention, wherein (a) is the front view, (b) is the left view, and (c) is the rear view. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described specific embodiments are merely a part of the embodiments of the invention, and not all of them. The components of the specific embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations, and the invention may also have other embodiments.

[0040] Therefore, the following detailed description of specific embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected specific embodiments of the invention. All other specific embodiments obtained by those skilled in the art based on these specific embodiments without inventive effort are within the scope of protection of this invention.

[0041] To further understand the invention's content, features, and effects, the following specific embodiments are provided, along with accompanying drawings. Figure 1 -Appendix Figure 3 Detailed explanation is as follows:

[0042] Example 1:

[0043] A method for preparing a pressure test includes the following steps:

[0044] S1. Connect the coarse testing device: Connect one end of each pressure measuring point on the model to one end of each pressure measuring hose, connect the other end of each pressure measuring hose to the pipeline parallel device, connect the other end of the pipeline parallel device to the high-pressure resistant air pipe, and connect the high-pressure resistant air pipe to the pressure generator;

[0045] Furthermore, the pipeline parallel connection device in step S1 has an aluminum alloy shell and a sealed cavity inside. The air inlet has one pipeline for connecting to a high-pressure resistant gas pipe, and the air outlet is equipped with multiple stainless steel capillary tubes for connecting multiple pressure measuring hoses, thereby realizing the parallel connection of multiple pipelines into one pipeline.

[0046] Furthermore, the high-pressure gas generated by the pressure generator in step S1 is switched on and off at high speed via a foot switch, a control module, and a high-speed solenoid valve.

[0047] Furthermore, the pressure generator has a range of 0.01-600 kPa, an accuracy of ±0.01% FS, a high-pressure resistant air hose with a diameter of Φ6 mm, and a pressure measuring hose with a diameter of Φ0.8 mm, enabling rapid loading and continuous maintenance of controllable pressure. The pressure generator's execution unit consists of a foot switch, a control module, and a high-speed solenoid valve (response time ≤50 ms), allowing for high-speed on / off switching of the pressure measuring pipeline.

[0048] S2. Perform coarse measurement and positioning: Use a pressure generator to inject pressure into the pressure testing hose, check the air circulation of the pressure testing hose, and code and label the pressure testing points and the pressure testing hoses that pass the coarse measurement. Simultaneously record the initial correspondence between the pressure testing point number and the pressure testing hose number in an electronic table.

[0049] Furthermore, in step S2, the pressure generator injects 30 kPa pressure into the high-pressure air pipe to check whether there is any blockage or leakage at the pressure measuring point.

[0050] Furthermore, based on the ventilation status, color-coded labels are affixed to the "pressure test point - pressure test hose" system, with green indicating compliance and red indicating blockage. Simultaneously, an electronic table recording the initial correspondence between the pressure test point number and the pressure test hose number is generated.

[0051] S3. Pre-inspection of electronic scanning valve performance: After the rough test is completed, disconnect the pressure testing hose and pipeline parallel device that passed the rough test. Connect the air inlet pipeline of the electronic scanning valve used for the pressure test to the pressure generator through the pipeline parallel device. Then test the electronic scanning valve. If the electronic scanning valve fails the test, the parts need to be replaced and the test needs to be repeated to ensure the stability of the air path of the electronic scanning valve.

[0052] Furthermore, step S3 involves testing the electronic scanning valve by using a pressure generator to supply a reference pressure P0 equal to half the electronic scanning valve's range, and continuously monitoring for 5 minutes. Pressure data for each channel is collected, where the pressure data for the i-th channel is P. i Calculate the measurement deviation at each point. and population standard deviation :

[0053]

[0054]

[0055] in, for The overall average value, where n is the total number of channels;

[0056] like ≤0.05%FS, where FS is the full scale, and If the pressure is ≤5Pa, the scanning valve is considered qualified. For unqualified electronic scanning valves, replace the parts and retest. Ensure the stability of the valve block air path during measurement.

[0057] Furthermore, the electronic scanning valve in step S3 is a 64-channel electronic scanning valve with a range of 15 PSI.

[0058] Furthermore, the intelligent calibration unit of the electronic scanning valve integrates a solenoid valve assembly (Φ6mm diameter) and a pressure measurement execution unit with red / green dual-color pass / fail indicator lights. It can achieve: ① automatic generation and visual editing of the correspondence table; ② real-time dynamic display of pressure curves (supporting zooming and data point annotation); ③ audible and visual alarms and location tracking for non-conforming channels; ④ automatic storage of test data (including raw data, a pass / fail list, and non-conforming processing records, supporting PDF / Excel export). The intelligent calibration unit includes a pressure measurement sorting module, which supports importing the original correspondence between "pressure measurement hose number and scanning valve channel number" and generating a sorted channel mapping table through spatial coordinate sorting, pressure gradient sorting, or a custom rule sorting algorithm. The pressure measurement sorting module has a visual interactive interface, allowing users to set sorting rules through drag-and-drop operations, and the test results can be exported to PDF / Excel format.

[0059] S4. Randomly connect the air outlet line of the pre-inspection qualified electronic scanning valve to the pressure testing hose that passed the coarse test, record the correspondence between the pressure testing hose number that passed the coarse test and the electronic scanning valve channel number, and form the original mapping dataset;

[0060] S5. Based on the initial correspondence table of the pressure test point numbers and pressure test hose numbers obtained in step S2 and the original mapping dataset obtained in step S4, the multi-channel scanning system sorts the pressure test points and electronic scanning valves to obtain the initial mapping dataset of pressure test points and electronic scanning valves.

[0061] Furthermore, the specific implementation method of step S5 includes the following steps:

[0062] S5.1. Activate the multi-channel scanning system, which includes cascaded electronic scanning valves, an electronic scanning valve, a pressure measuring host, and an industrial-grade control computer connected in sequence. A single pressure measuring host supports the synchronous detection of 1-512 pressure measuring points, and the data is transmitted in real time via RJ45 Ethernet.

[0063] S5.2. Reorder the pressure measurement points within the industrial control computer of the multi-channel scanning system. The reordering method includes the following steps:

[0064] S5.2.1. Set spatial coordinate sorting: Set the X-axis to ascending order from the front end to the back end of the model, and the Y-axis to hierarchical order for the left or right wing partitions of the model, generating a new data arrangement mapping;

[0065] S5.2.2. Set pressure gradient sorting: Based on pre-test data, reorganize the channel order according to pressure values ​​from smallest to largest;

[0066] S5.2.3. Set custom sorting rules: Set sorting logic through drag-and-drop interface, including skipping fault points or arranging by odd and even number intervals.

[0067] S6. Quantitative airtightness measurement: Based on the initial mapping dataset of the pressure measurement points and electronic scanning valve obtained in step S5, the pressure generator connects to the pressure measurement points through the electronic scanning valve to perform quantitative airtightness measurement. The multi-channel scanning system receives the pressure data of the pressure measurement points collected by the electronic scanning valve in real time, completing the preparation work for the pressure test.

[0068] Furthermore, in step S6, the method for quantitative airtightness measurement involves injecting a standard pressure P0 (half the range of the electronic scanning valve) into a single pressure measurement point using a pressure generator. After controlling the solenoid valve to cut off the air path, the pressure holding stage begins. The industrial control computer then collects pressure data P within 10 seconds at a frequency of 100Hz in real time. 10 Calculate the pressure change ΔP = |P 10 -P0|;If ΔP>30Pa, manually check the hose joints or sealing devices until all channels pass the test. During each test, the test data is automatically stored in the industrial control computer.

[0069] Furthermore, during the precision measurement process, the industrial control computer receives the pressure data collected by the scanning valve in real time and dynamically displays the pressure curve according to the sorted channel order, ensuring that operators can check for leaks in logical order (rather than physical channel order).

[0070] The following is a case study of a large-scale test based on this embodiment, taking a pressure test of an aircraft model with 512 pressure measurement points as an example;

[0071] I. Coarse Measurement and Positioning Stage

[0072] Correspondence calibration: Connect 512 Φ0.8mm silicone hoses to the model pressure measurement points via stainless steel capillary tubes, with the other end connected to the pipeline parallel connection device. The standard pressure generator is also connected to the pipeline parallel connection device via a Φ6mm pressure measurement tube, completing the gas pipeline connection for the rough measurement stage.

[0073] Step on the foot switch, and the standard pressure generating device injects 30 kPa pressure into the pipeline. Check the air circulation of the pressure measuring points on the model. Affix green coded labels to the 500 pressure measuring points with good air circulation, and mark the 12 non-air-circuited hoses with red coded labels. The inspection revealed that 8 of them were blocked pipelines and 4 were damaged hoses. After clearing the pipeline and replacing the hoses, the model was tested and found to be qualified.

[0074] II. Precision Measurement and Verification Phase

[0075] Electronic scanning valve block pre-inspection: 50 kPa pressure was applied to 8 64-channel electronic scanning valves (range 15 PSI) and monitored for 5 minutes. The measurement deviation of all scanning valve channels was ≤20 Pa and the standard deviation was ≤5 Pa, which met the requirements. The scanning valve block pre-inspection was qualified.

[0076] Mapping relationship establishment: 512 hoses are randomly connected to 8 scanning valves, and the corresponding relationship data such as "Hose 001 - Channel 15, Hose 002 - Channel 89..." are recorded. The X / Y coordinates of the pressure measurement points are imported (e.g., X=0-10m is the model axis), and the sorting rule of "X-axis increment + Y-axis partitioning" is selected. The software generates a new mapping within 10 seconds: logical channel 1 corresponds to hose 012 (physical channel 3) with X=0.1m, logical channel 2 corresponds to hose 056 (physical channel 22) with X=0.2m, and so on.

[0077] Quantitative airtightness test: The precision testing program was initiated, and the pressure source sequentially injected 50 kPa pressure into each channel, holding the pressure for 10 seconds. Channel 52 (ΔP=32 Pa) triggered an alarm. Inspection revealed slight wear on the sealing ring of the sealing device. After replacement, the ΔP was retested and found to be 18 Pa, which was acceptable. Ultimately, all 512 channels passed the test, and an Excel file containing the pressure data for each channel was stored.

[0078] Comparison of experimental results and efficiency:

[0079] 1. Random connection efficiency comparison: Traditional method: It is necessary to connect 512 hoses to 8 scanning valves (512 channels in total) one by one according to their numbers, which takes about 12 hours; The method in this embodiment: After random connection, the correspondence is recorded, which takes only 7 hours, which is 58% of the time of the previous method.

[0080] 2. Sorting Software Operation Procedure: Import the raw data and X / Y coordinates of the pressure measurement points (e.g., X=0-10m for the machine body axis). Select the sorting rule "X-axis increment + Y-axis partitioning," and the software quickly generates a new mapping. During precision measurement, the software displays the pressure curves in logical channel order. The operator checks the pressure curves from front to back along the machine body and finds that the pressure fluctuation of hose 189 (physical channel 156) at X=5.2m exceeds the standard. The location and repair are then quickly completed.

[0081] 3. Sorting adjustment during the experiment: When it is necessary to analyze the pressure gradient on the upper surface of the wing, simply select "Pressure value sorting" without changing the physical connection. The data can be reorganized within 30 seconds, which greatly improves the analysis efficiency.

[0082] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Although this application has been described above with reference to specific embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of this application. In particular, as long as there is no structural conflict, the features in the specific embodiments disclosed in this application can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, this application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for preparing a pressure test, characterized in that, Includes the following steps: S1. Connect the coarse testing device: Connect one end of each pressure measuring point on the model to one end of each pressure measuring hose, connect the other end of each pressure measuring hose to the pipeline parallel device, connect the other end of the pipeline parallel device to the high-pressure resistant air pipe, and connect the high-pressure resistant air pipe to the pressure generator; S2. Perform coarse measurement and positioning: Use a pressure generator to inject pressure into the pressure testing hose, check the air circulation of the pressure testing hose, and code and label the pressure testing points and the pressure testing hoses that pass the coarse measurement. Simultaneously record the initial correspondence between the pressure testing point number and the pressure testing hose number in an electronic table. S3. Pre-inspection of electronic scanning valve performance: After the rough test is completed, disconnect the pressure testing hose and pipeline parallel device that passed the rough test. Connect the air inlet pipeline of the electronic scanning valve used for the pressure test to the pressure generator through the pipeline parallel device. Then test the electronic scanning valve. If the electronic scanning valve fails the test, the parts need to be replaced and the test needs to be repeated to ensure the stability of the air path of the electronic scanning valve. S4. Randomly connect the air outlet line of the pre-inspection qualified electronic scanning valve to the pressure testing hose that passed the coarse test, record the correspondence between the pressure testing hose number that passed the coarse test and the electronic scanning valve channel number, and form the original mapping dataset; S5. Based on the initial correspondence table of the pressure test point numbers and pressure test hose numbers obtained in step S2 and the original mapping dataset obtained in step S4, the multi-channel scanning system sorts the pressure test points and electronic scanning valves to obtain the initial mapping dataset of pressure test points and electronic scanning valves. S6. Quantitative airtightness measurement: Based on the initial mapping dataset of the pressure measurement points and electronic scanning valve obtained in step S5, the pressure generator connects to the pressure measurement points through the electronic scanning valve to perform quantitative airtightness measurement. The multi-channel scanning system receives the pressure data of the pressure measurement points collected by the electronic scanning valve in real time, completing the preparation work for the pressure test.

2. The preparation method for a pressure test according to claim 1, characterized in that, The pipeline parallel connection device in step S1 has an aluminum alloy shell and a sealed cavity inside. The air inlet has one pipeline for connecting to a high-pressure resistant gas pipe, and the air outlet has multiple stainless steel capillary tubes for connecting multiple pressure measuring hoses, thus realizing the parallel connection of multiple pipelines into one pipeline.

3. The preparation method for a pressure test according to claim 2, characterized in that, The high-pressure gas generated by the pressure generator in step S1 is switched on and off at high speed through a foot switch, control module and high-speed solenoid valve.

4. The preparation method for a pressure test according to claim 3, characterized in that, In step S2, the pressure generator injects 30 kPa pressure into the high-pressure air pipe and checks the air passage at the pressure measuring point for blockages or leaks.

5. The preparation method for a pressure test according to claim 4, characterized in that, Step S3 involves testing the electronic scanning valve by using a pressure generator to supply a reference pressure P0 equal to half the electronic scanning valve's range, continuously monitoring for 5 minutes, and collecting pressure data for each channel. The pressure data for the i-th channel is P. i Calculate the measurement deviation at each point. and population standard deviation : ； ； in, for The overall average value, where n is the total number of channels; like ≤0.05%FS, where FS is the full scale, and If the pressure is ≤5Pa, the scanning valve is considered qualified. For unqualified electronic scanning valves, replace the parts and retest. Ensure the stability of the valve block air path during measurement.

6. The preparation method for a pressure test according to claim 5, characterized in that, The specific implementation method of step S5 includes the following steps: S5.

1. Activate the multi-channel scanning system, which includes cascaded electronic scanning valves, an electronic scanning valve, a pressure measuring host, and an industrial-grade control computer connected in sequence. A single pressure measuring host supports the synchronous detection of 1-512 pressure measuring points, and the data is transmitted in real time via RJ45 Ethernet. S5.

2. Reorder the pressure measurement points within the industrial control computer of the multi-channel scanning system. The reordering method includes the following steps: S5.2.

1. Set spatial coordinate sorting: Set the X-axis to ascending order from the front end to the back end of the model, and the Y-axis to hierarchical order for the left or right wing partitions of the model, generating a new data arrangement mapping; S5.2.

2. Set pressure gradient sorting: Based on pre-test data, reorganize the channel order according to pressure values ​​from smallest to largest; S5.2.

3. Set custom sorting rules: Set sorting logic through drag-and-drop interface, including skipping fault points or arranging by odd and even number intervals.

7. The preparation method for a pressure test according to claim 6, characterized in that, Step S6 involves a quantitative airtightness measurement method where a pressure generator injects a standard pressure P0 (half the range of the electronic scanning valve) into a single pressure measurement point. After the solenoid valve cuts off the gas path, the pressure holding phase begins. The industrial control computer then collects pressure data P within 10 seconds at a frequency of 100Hz in real time. 10 Calculate the pressure change ΔP = |P 10 -P0|;If ΔP>30Pa, manually check the hose joints or sealing devices until all channels pass the test. During each test, the test data is automatically stored in the industrial control computer.

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